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/* File IO for GNU Emacs.
Copyright (C) 1985-1988, 1993-2015 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <limits.h>
#include <fcntl.h>
#include "sysstdio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <errno.h>
#ifdef HAVE_LIBSELINUX
#include <selinux/selinux.h>
#include <selinux/context.h>
#endif
#ifdef HAVE_ACL_SET_FILE
#include <sys/acl.h>
#endif
#include <c-ctype.h>
#include "lisp.h"
#include "intervals.h"
#include "character.h"
#include "buffer.h"
#include "coding.h"
#include "window.h"
#include "blockinput.h"
#include "region-cache.h"
#include "frame.h"
#include "dispextern.h"
#ifdef WINDOWSNT
#define NOMINMAX 1
#include <windows.h>
#include <sys/file.h>
#include "w32.h"
#endif /* not WINDOWSNT */
#ifdef MSDOS
#include "msdos.h"
#include <sys/param.h>
#endif
#ifdef DOS_NT
/* On Windows, drive letters must be alphabetic - on DOS, the Netware
redirector allows the six letters between 'Z' and 'a' as well. */
#ifdef MSDOS
#define IS_DRIVE(x) ((x) >= 'A' && (x) <= 'z')
#endif
#ifdef WINDOWSNT
#define IS_DRIVE(x) c_isalpha (x)
#endif
/* Need to lower-case the drive letter, or else expanded
filenames will sometimes compare unequal, because
`expand-file-name' doesn't always down-case the drive letter. */
#define DRIVE_LETTER(x) c_tolower (x)
#endif
#include "systime.h"
#include <acl.h>
#include <allocator.h>
#include <careadlinkat.h>
#include <stat-time.h>
#ifdef HPUX
#include <netio.h>
#endif
#include "commands.h"
/* True during writing of auto-save files. */
static bool auto_saving;
/* Emacs's real umask. */
static mode_t realmask;
/* Nonzero umask during creation of auto-save directories. */
static mode_t auto_saving_dir_umask;
/* Set by auto_save_1 to mode of original file so Fwrite_region will create
a new file with the same mode as the original. */
static mode_t auto_save_mode_bits;
/* Set by auto_save_1 if an error occurred during the last auto-save. */
static bool auto_save_error_occurred;
/* If VALID_TIMESTAMP_FILE_SYSTEM, then TIMESTAMP_FILE_SYSTEM is the device
number of a file system where time stamps were observed to to work. */
static bool valid_timestamp_file_system;
static dev_t timestamp_file_system;
/* The symbol bound to coding-system-for-read when
insert-file-contents is called for recovering a file. This is not
an actual coding system name, but just an indicator to tell
insert-file-contents to use `emacs-mule' with a special flag for
auto saving and recovering a file. */
static Lisp_Object Qauto_save_coding;
/* Property name of a file name handler,
which gives a list of operations it handles.. */
static Lisp_Object Qoperations;
/* Lisp functions for translating file formats. */
static Lisp_Object Qformat_decode, Qformat_annotate_function;
/* Lisp function for setting buffer-file-coding-system and the
multibyteness of the current buffer after inserting a file. */
static Lisp_Object Qafter_insert_file_set_coding;
static Lisp_Object Qwrite_region_annotate_functions;
/* Each time an annotation function changes the buffer, the new buffer
is added here. */
static Lisp_Object Vwrite_region_annotation_buffers;
static Lisp_Object Qdelete_by_moving_to_trash;
/* Lisp function for moving files to trash. */
static Lisp_Object Qmove_file_to_trash;
/* Lisp function for recursively copying directories. */
static Lisp_Object Qcopy_directory;
/* Lisp function for recursively deleting directories. */
static Lisp_Object Qdelete_directory;
static Lisp_Object Qsubstitute_env_in_file_name;
Lisp_Object Qfile_error, Qfile_notify_error;
static Lisp_Object Qfile_already_exists, Qfile_date_error;
static Lisp_Object Qexcl;
Lisp_Object Qfile_name_history;
static Lisp_Object Qcar_less_than_car;
static bool a_write (int, Lisp_Object, ptrdiff_t, ptrdiff_t,
Lisp_Object *, struct coding_system *);
static bool e_write (int, Lisp_Object, ptrdiff_t, ptrdiff_t,
struct coding_system *);
/* Return true if FILENAME exists. */
static bool
check_existing (const char *filename)
{
return faccessat (AT_FDCWD, filename, F_OK, AT_EACCESS) == 0;
}
/* Return true if file FILENAME exists and can be executed. */
static bool
check_executable (char *filename)
{
return faccessat (AT_FDCWD, filename, X_OK, AT_EACCESS) == 0;
}
/* Return true if file FILENAME exists and can be accessed
according to AMODE, which should include W_OK.
On failure, return false and set errno. */
static bool
check_writable (const char *filename, int amode)
{
#ifdef MSDOS
/* FIXME: an faccessat implementation should be added to the
DOS/Windows ports and this #ifdef branch should be removed. */
struct stat st;
if (stat (filename, &st) < 0)
return 0;
errno = EPERM;
return (st.st_mode & S_IWRITE || S_ISDIR (st.st_mode));
#else /* not MSDOS */
bool res = faccessat (AT_FDCWD, filename, amode, AT_EACCESS) == 0;
#ifdef CYGWIN
/* faccessat may have returned failure because Cygwin couldn't
determine the file's UID or GID; if so, we return success. */
if (!res)
{
int faccessat_errno = errno;
struct stat st;
if (stat (filename, &st) < 0)
return 0;
res = (st.st_uid == -1 || st.st_gid == -1);
errno = faccessat_errno;
}
#endif /* CYGWIN */
return res;
#endif /* not MSDOS */
}
/* Signal a file-access failure. STRING describes the failure,
NAME the file involved, and ERRORNO the errno value.
If NAME is neither null nor a pair, package it up as a singleton
list before reporting it; this saves report_file_errno's caller the
trouble of preserving errno before calling list1. */
void
report_file_errno (char const *string, Lisp_Object name, int errorno)
{
Lisp_Object data = CONSP (name) || NILP (name) ? name : list1 (name);
Lisp_Object errstring;
char *str;
synchronize_system_messages_locale ();
str = strerror (errorno);
errstring = code_convert_string_norecord (build_unibyte_string (str),
Vlocale_coding_system, 0);
while (1)
switch (errorno)
{
case EEXIST:
xsignal (Qfile_already_exists, Fcons (errstring, data));
break;
default:
/* System error messages are capitalized. Downcase the initial
unless it is followed by a slash. (The slash case caters to
error messages that begin with "I/O" or, in German, "E/A".) */
if (STRING_MULTIBYTE (errstring)
&& ! EQ (Faref (errstring, make_number (1)), make_number ('/')))
{
int c;
str = SSDATA (errstring);
c = STRING_CHAR ((unsigned char *) str);
Faset (errstring, make_number (0), make_number (downcase (c)));
}
xsignal (Qfile_error,
Fcons (build_string (string), Fcons (errstring, data)));
}
}
/* Signal a file-access failure that set errno. STRING describes the
failure, NAME the file involved. When invoking this function, take
care to not use arguments such as build_string ("foo") that involve
side effects that may set errno. */
void
report_file_error (char const *string, Lisp_Object name)
{
report_file_errno (string, name, errno);
}
void
close_file_unwind (int fd)
{
emacs_close (fd);
}
void
fclose_unwind (void *arg)
{
FILE *stream = arg;
fclose (stream);
}
/* Restore point, having saved it as a marker. */
void
restore_point_unwind (Lisp_Object location)
{
Fgoto_char (location);
unchain_marker (XMARKER (location));
}
static Lisp_Object Qexpand_file_name;
static Lisp_Object Qsubstitute_in_file_name;
static Lisp_Object Qdirectory_file_name;
static Lisp_Object Qfile_name_directory;
static Lisp_Object Qfile_name_nondirectory;
static Lisp_Object Qunhandled_file_name_directory;
static Lisp_Object Qfile_name_as_directory;
static Lisp_Object Qcopy_file;
static Lisp_Object Qmake_directory_internal;
static Lisp_Object Qmake_directory;
static Lisp_Object Qdelete_directory_internal;
Lisp_Object Qdelete_file;
static Lisp_Object Qrename_file;
static Lisp_Object Qadd_name_to_file;
static Lisp_Object Qmake_symbolic_link;
Lisp_Object Qfile_exists_p;
static Lisp_Object Qfile_executable_p;
static Lisp_Object Qfile_readable_p;
static Lisp_Object Qfile_writable_p;
static Lisp_Object Qfile_symlink_p;
static Lisp_Object Qaccess_file;
Lisp_Object Qfile_directory_p;
static Lisp_Object Qfile_regular_p;
static Lisp_Object Qfile_accessible_directory_p;
static Lisp_Object Qfile_modes;
static Lisp_Object Qset_file_modes;
static Lisp_Object Qset_file_times;
static Lisp_Object Qfile_selinux_context;
static Lisp_Object Qset_file_selinux_context;
static Lisp_Object Qfile_acl;
static Lisp_Object Qset_file_acl;
static Lisp_Object Qfile_newer_than_file_p;
Lisp_Object Qinsert_file_contents;
Lisp_Object Qwrite_region;
static Lisp_Object Qverify_visited_file_modtime;
static Lisp_Object Qset_visited_file_modtime;
DEFUN ("find-file-name-handler", Ffind_file_name_handler,
Sfind_file_name_handler, 2, 2, 0,
doc: /* Return FILENAME's handler function for OPERATION, if it has one.
Otherwise, return nil.
A file name is handled if one of the regular expressions in
`file-name-handler-alist' matches it.
If OPERATION equals `inhibit-file-name-operation', then we ignore
any handlers that are members of `inhibit-file-name-handlers',
but we still do run any other handlers. This lets handlers
use the standard functions without calling themselves recursively. */)
(Lisp_Object filename, Lisp_Object operation)
{
/* This function must not munge the match data. */
Lisp_Object chain, inhibited_handlers, result;
ptrdiff_t pos = -1;
result = Qnil;
CHECK_STRING (filename);
if (EQ (operation, Vinhibit_file_name_operation))
inhibited_handlers = Vinhibit_file_name_handlers;
else
inhibited_handlers = Qnil;
for (chain = Vfile_name_handler_alist; CONSP (chain);
chain = XCDR (chain))
{
Lisp_Object elt;
elt = XCAR (chain);
if (CONSP (elt))
{
Lisp_Object string = XCAR (elt);
ptrdiff_t match_pos;
Lisp_Object handler = XCDR (elt);
Lisp_Object operations = Qnil;
if (SYMBOLP (handler))
operations = Fget (handler, Qoperations);
if (STRINGP (string)
&& (match_pos = fast_string_match (string, filename)) > pos
&& (NILP (operations) || ! NILP (Fmemq (operation, operations))))
{
Lisp_Object tem;
handler = XCDR (elt);
tem = Fmemq (handler, inhibited_handlers);
if (NILP (tem))
{
result = handler;
pos = match_pos;
}
}
}
QUIT;
}
return result;
}
DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory,
1, 1, 0,
doc: /* Return the directory component in file name FILENAME.
Return nil if FILENAME does not include a directory.
Otherwise return a directory name.
Given a Unix syntax file name, returns a string ending in slash. */)
(Lisp_Object filename)
{
#ifndef DOS_NT
register const char *beg;
#else
register char *beg;
Lisp_Object tem_fn;
#endif
register const char *p;
Lisp_Object handler;
CHECK_STRING (filename);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qfile_name_directory);
if (!NILP (handler))
{
Lisp_Object handled_name = call2 (handler, Qfile_name_directory,
filename);
return STRINGP (handled_name) ? handled_name : Qnil;
}
#ifdef DOS_NT
beg = xlispstrdupa (filename);
#else
beg = SSDATA (filename);
#endif
p = beg + SBYTES (filename);
while (p != beg && !IS_DIRECTORY_SEP (p[-1])
#ifdef DOS_NT
/* only recognize drive specifier at the beginning */
&& !(p[-1] == ':'
/* handle the "/:d:foo" and "/:foo" cases correctly */
&& ((p == beg + 2 && !IS_DIRECTORY_SEP (*beg))
|| (p == beg + 4 && IS_DIRECTORY_SEP (*beg))))
#endif
) p--;
if (p == beg)
return Qnil;
#ifdef DOS_NT
/* Expansion of "c:" to drive and default directory. */
if (p[-1] == ':')
{
/* MAXPATHLEN+1 is guaranteed to be enough space for getdefdir. */
char *res = alloca (MAXPATHLEN + 1);
char *r = res;
if (p == beg + 4 && IS_DIRECTORY_SEP (*beg) && beg[1] == ':')
{
memcpy (res, beg, 2);
beg += 2;
r += 2;
}
if (getdefdir (c_toupper (*beg) - 'A' + 1, r))
{
size_t l = strlen (res);
if (l > 3 || !IS_DIRECTORY_SEP (res[l - 1]))
strcat (res, "/");
beg = res;
p = beg + strlen (beg);
dostounix_filename (beg);
tem_fn = make_specified_string (beg, -1, p - beg,
STRING_MULTIBYTE (filename));
}
else
tem_fn = make_specified_string (beg - 2, -1, p - beg + 2,
STRING_MULTIBYTE (filename));
}
else if (STRING_MULTIBYTE (filename))
{
tem_fn = make_specified_string (beg, -1, p - beg, 1);
dostounix_filename (SSDATA (tem_fn));
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
tem_fn = Fdowncase (tem_fn);
#endif
}
else
{
dostounix_filename (beg);
tem_fn = make_specified_string (beg, -1, p - beg, 0);
}
return tem_fn;
#else /* DOS_NT */
return make_specified_string (beg, -1, p - beg, STRING_MULTIBYTE (filename));
#endif /* DOS_NT */
}
DEFUN ("file-name-nondirectory", Ffile_name_nondirectory,
Sfile_name_nondirectory, 1, 1, 0,
doc: /* Return file name FILENAME sans its directory.
For example, in a Unix-syntax file name,
this is everything after the last slash,
or the entire name if it contains no slash. */)
(Lisp_Object filename)
{
register const char *beg, *p, *end;
Lisp_Object handler;
CHECK_STRING (filename);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qfile_name_nondirectory);
if (!NILP (handler))
{
Lisp_Object handled_name = call2 (handler, Qfile_name_nondirectory,
filename);
if (STRINGP (handled_name))
return handled_name;
error ("Invalid handler in `file-name-handler-alist'");
}
beg = SSDATA (filename);
end = p = beg + SBYTES (filename);
while (p != beg && !IS_DIRECTORY_SEP (p[-1])
#ifdef DOS_NT
/* only recognize drive specifier at beginning */
&& !(p[-1] == ':'
/* handle the "/:d:foo" case correctly */
&& (p == beg + 2 || (p == beg + 4 && IS_DIRECTORY_SEP (*beg))))
#endif
)
p--;
return make_specified_string (p, -1, end - p, STRING_MULTIBYTE (filename));
}
DEFUN ("unhandled-file-name-directory", Funhandled_file_name_directory,
Sunhandled_file_name_directory, 1, 1, 0,
doc: /* Return a directly usable directory name somehow associated with FILENAME.
A `directly usable' directory name is one that may be used without the
intervention of any file handler.
If FILENAME is a directly usable file itself, return
\(file-name-directory FILENAME).
If FILENAME refers to a file which is not accessible from a local process,
then this should return nil.
The `call-process' and `start-process' functions use this function to
get a current directory to run processes in. */)
(Lisp_Object filename)
{
Lisp_Object handler;
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qunhandled_file_name_directory);
if (!NILP (handler))
{
Lisp_Object handled_name = call2 (handler, Qunhandled_file_name_directory,
filename);
return STRINGP (handled_name) ? handled_name : Qnil;
}
return Ffile_name_directory (filename);
}
/* Maximum number of bytes that DST will be longer than SRC
in file_name_as_directory. This occurs when SRCLEN == 0. */
enum { file_name_as_directory_slop = 2 };
/* Convert from file name SRC of length SRCLEN to directory name in
DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
string. On UNIX, just make sure there is a terminating /. Return
the length of DST in bytes. */
static ptrdiff_t
file_name_as_directory (char *dst, const char *src, ptrdiff_t srclen,
bool multibyte)
{
if (srclen == 0)
{
dst[0] = '.';
dst[1] = '/';
dst[2] = '\0';
return 2;
}
memcpy (dst, src, srclen);
if (!IS_DIRECTORY_SEP (dst[srclen - 1]))
dst[srclen++] = DIRECTORY_SEP;
dst[srclen] = 0;
#ifdef DOS_NT
dostounix_filename (dst);
#endif
return srclen;
}
DEFUN ("file-name-as-directory", Ffile_name_as_directory,
Sfile_name_as_directory, 1, 1, 0,
doc: /* Return a string representing the file name FILE interpreted as a directory.
This operation exists because a directory is also a file, but its name as
a directory is different from its name as a file.
The result can be used as the value of `default-directory'
or passed as second argument to `expand-file-name'.
For a Unix-syntax file name, just appends a slash. */)
(Lisp_Object file)
{
char *buf;
ptrdiff_t length;
Lisp_Object handler, val;
USE_SAFE_ALLOCA;
CHECK_STRING (file);
if (NILP (file))
return Qnil;
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (file, Qfile_name_as_directory);
if (!NILP (handler))
{
Lisp_Object handled_name = call2 (handler, Qfile_name_as_directory,
file);
if (STRINGP (handled_name))
return handled_name;
error ("Invalid handler in `file-name-handler-alist'");
}
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
file = Fdowncase (file);
#endif
buf = SAFE_ALLOCA (SBYTES (file) + file_name_as_directory_slop + 1);
length = file_name_as_directory (buf, SSDATA (file), SBYTES (file),
STRING_MULTIBYTE (file));
val = make_specified_string (buf, -1, length, STRING_MULTIBYTE (file));
SAFE_FREE ();
return val;
}
/* Convert from directory name SRC of length SRCLEN to file name in
DST. MULTIBYTE non-zero means the file name in SRC is a multibyte
string. On UNIX, just make sure there isn't a terminating /.
Return the length of DST in bytes. */
static ptrdiff_t
directory_file_name (char *dst, char *src, ptrdiff_t srclen, bool multibyte)
{
/* Process as Unix format: just remove any final slash.
But leave "/" and "//" unchanged. */
while (srclen > 1
#ifdef DOS_NT
&& !IS_ANY_SEP (src[srclen - 2])
#endif
&& IS_DIRECTORY_SEP (src[srclen - 1])
&& ! (srclen == 2 && IS_DIRECTORY_SEP (src[0])))
srclen--;
memcpy (dst, src, srclen);
dst[srclen] = 0;
#ifdef DOS_NT
dostounix_filename (dst);
#endif
return srclen;
}
DEFUN ("directory-file-name", Fdirectory_file_name, Sdirectory_file_name,
1, 1, 0,
doc: /* Returns the file name of the directory named DIRECTORY.
This is the name of the file that holds the data for the directory DIRECTORY.
This operation exists because a directory is also a file, but its name as
a directory is different from its name as a file.
In Unix-syntax, this function just removes the final slash. */)
(Lisp_Object directory)
{
char *buf;
ptrdiff_t length;
Lisp_Object handler, val;
USE_SAFE_ALLOCA;
CHECK_STRING (directory);
if (NILP (directory))
return Qnil;
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (directory, Qdirectory_file_name);
if (!NILP (handler))
{
Lisp_Object handled_name = call2 (handler, Qdirectory_file_name,
directory);
if (STRINGP (handled_name))
return handled_name;
error ("Invalid handler in `file-name-handler-alist'");
}
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
directory = Fdowncase (directory);
#endif
buf = SAFE_ALLOCA (SBYTES (directory) + 1);
length = directory_file_name (buf, SSDATA (directory), SBYTES (directory),
STRING_MULTIBYTE (directory));
val = make_specified_string (buf, -1, length, STRING_MULTIBYTE (directory));
SAFE_FREE ();
return val;
}
static const char make_temp_name_tbl[64] =
{
'A','B','C','D','E','F','G','H',
'I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X',
'Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n',
'o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3',
'4','5','6','7','8','9','-','_'
};
static unsigned make_temp_name_count, make_temp_name_count_initialized_p;
/* Value is a temporary file name starting with PREFIX, a string.
The Emacs process number forms part of the result, so there is
no danger of generating a name being used by another process.
In addition, this function makes an attempt to choose a name
which has no existing file. To make this work, PREFIX should be
an absolute file name.
BASE64_P means add the pid as 3 characters in base64
encoding. In this case, 6 characters will be added to PREFIX to
form the file name. Otherwise, if Emacs is running on a system
with long file names, add the pid as a decimal number.
This function signals an error if no unique file name could be
generated. */
Lisp_Object
make_temp_name (Lisp_Object prefix, bool base64_p)
{
Lisp_Object val, encoded_prefix;
ptrdiff_t len;
printmax_t pid;
char *p, *data;
char pidbuf[INT_BUFSIZE_BOUND (printmax_t)];
int pidlen;
CHECK_STRING (prefix);
/* VAL is created by adding 6 characters to PREFIX. The first
three are the PID of this process, in base 64, and the second
three are incremented if the file already exists. This ensures
262144 unique file names per PID per PREFIX. */
pid = getpid ();
if (base64_p)
{
pidbuf[0] = make_temp_name_tbl[pid & 63], pid >>= 6;
pidbuf[1] = make_temp_name_tbl[pid & 63], pid >>= 6;
pidbuf[2] = make_temp_name_tbl[pid & 63], pid >>= 6;
pidlen = 3;
}
else
{
#ifdef HAVE_LONG_FILE_NAMES
pidlen = sprintf (pidbuf, "%"pMd, pid);
#else
pidbuf[0] = make_temp_name_tbl[pid & 63], pid >>= 6;
pidbuf[1] = make_temp_name_tbl[pid & 63], pid >>= 6;
pidbuf[2] = make_temp_name_tbl[pid & 63], pid >>= 6;
pidlen = 3;
#endif
}
encoded_prefix = ENCODE_FILE (prefix);
len = SBYTES (encoded_prefix);
val = make_uninit_string (len + 3 + pidlen);
data = SSDATA (val);
memcpy (data, SSDATA (encoded_prefix), len);
p = data + len;
memcpy (p, pidbuf, pidlen);
p += pidlen;
/* Here we try to minimize useless stat'ing when this function is
invoked many times successively with the same PREFIX. We achieve
this by initializing count to a random value, and incrementing it
afterwards.
We don't want make-temp-name to be called while dumping,
because then make_temp_name_count_initialized_p would get set
and then make_temp_name_count would not be set when Emacs starts. */
if (!make_temp_name_count_initialized_p)
{
make_temp_name_count = time (NULL);
make_temp_name_count_initialized_p = 1;
}
while (1)
{
unsigned num = make_temp_name_count;
p[0] = make_temp_name_tbl[num & 63], num >>= 6;
p[1] = make_temp_name_tbl[num & 63], num >>= 6;
p[2] = make_temp_name_tbl[num & 63], num >>= 6;
/* Poor man's congruential RN generator. Replace with
++make_temp_name_count for debugging. */
make_temp_name_count += 25229;
make_temp_name_count %= 225307;
if (!check_existing (data))
{
/* We want to return only if errno is ENOENT. */
if (errno == ENOENT)
return DECODE_FILE (val);
else
/* The error here is dubious, but there is little else we
can do. The alternatives are to return nil, which is
as bad as (and in many cases worse than) throwing the
error, or to ignore the error, which will likely result
in looping through 225307 stat's, which is not only
dog-slow, but also useless since eventually nil would
have to be returned anyway. */
report_file_error ("Cannot create temporary name for prefix",
prefix);
/* not reached */
}
}
}
DEFUN ("make-temp-name", Fmake_temp_name, Smake_temp_name, 1, 1, 0,
doc: /* Generate temporary file name (string) starting with PREFIX (a string).
The Emacs process number forms part of the result,
so there is no danger of generating a name being used by another process.
In addition, this function makes an attempt to choose a name
which has no existing file. To make this work,
PREFIX should be an absolute file name.
There is a race condition between calling `make-temp-name' and creating the
file which opens all kinds of security holes. For that reason, you should
probably use `make-temp-file' instead, except in three circumstances:
* If you are creating the file in the user's home directory.
* If you are creating a directory rather than an ordinary file.
* If you are taking special precautions as `make-temp-file' does. */)
(Lisp_Object prefix)
{
return make_temp_name (prefix, 0);
}
DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
doc: /* Convert filename NAME to absolute, and canonicalize it.
Second arg DEFAULT-DIRECTORY is directory to start with if NAME is relative
\(does not start with slash or tilde); both the directory name and
a directory's file name are accepted. If DEFAULT-DIRECTORY is nil or
missing, the current buffer's value of `default-directory' is used.
NAME should be a string that is a valid file name for the underlying
filesystem.
File name components that are `.' are removed, and
so are file name components followed by `..', along with the `..' itself;
note that these simplifications are done without checking the resulting
file names in the file system.
Multiple consecutive slashes are collapsed into a single slash,
except at the beginning of the file name when they are significant (e.g.,
UNC file names on MS-Windows.)
An initial `~/' expands to your home directory.
An initial `~USER/' expands to USER's home directory.
See also the function `substitute-in-file-name'.
For technical reasons, this function can return correct but
non-intuitive results for the root directory; for instance,
\(expand-file-name ".." "/") returns "/..". For this reason, use
\(directory-file-name (file-name-directory dirname)) to traverse a
filesystem tree, not (expand-file-name ".." dirname). */)
(Lisp_Object name, Lisp_Object default_directory)
{
/* These point to SDATA and need to be careful with string-relocation
during GC (via DECODE_FILE). */
char *nm;
const char *newdir;
/* This should only point to alloca'd data. */
char *target;
ptrdiff_t tlen;
struct passwd *pw;
#ifdef DOS_NT
int drive = 0;
bool collapse_newdir = 1;
bool is_escaped = 0;
#endif /* DOS_NT */
ptrdiff_t length;
Lisp_Object handler, result, handled_name;
bool multibyte;
Lisp_Object hdir;
USE_SAFE_ALLOCA;
CHECK_STRING (name);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (name, Qexpand_file_name);
if (!NILP (handler))
{
handled_name = call3 (handler, Qexpand_file_name,
name, default_directory);
if (STRINGP (handled_name))
return handled_name;
error ("Invalid handler in `file-name-handler-alist'");
}
/* Use the buffer's default-directory if DEFAULT_DIRECTORY is omitted. */
if (NILP (default_directory))
default_directory = BVAR (current_buffer, directory);
if (! STRINGP (default_directory))
{
#ifdef DOS_NT
/* "/" is not considered a root directory on DOS_NT, so using "/"
here causes an infinite recursion in, e.g., the following:
(let (default-directory)
(expand-file-name "a"))
To avoid this, we set default_directory to the root of the
current drive. */
default_directory = build_string (emacs_root_dir ());
#else
default_directory = build_string ("/");
#endif
}
if (!NILP (default_directory))
{
handler = Ffind_file_name_handler (default_directory, Qexpand_file_name);
if (!NILP (handler))
{
handled_name = call3 (handler, Qexpand_file_name,
name, default_directory);
if (STRINGP (handled_name))
return handled_name;
error ("Invalid handler in `file-name-handler-alist'");
}
}
{
char *o = SSDATA (default_directory);
/* Make sure DEFAULT_DIRECTORY is properly expanded.
It would be better to do this down below where we actually use
default_directory. Unfortunately, calling Fexpand_file_name recursively
could invoke GC, and the strings might be relocated. This would
be annoying because we have pointers into strings lying around
that would need adjusting, and people would add new pointers to
the code and forget to adjust them, resulting in intermittent bugs.
Putting this call here avoids all that crud.
The EQ test avoids infinite recursion. */
if (! NILP (default_directory) && !EQ (default_directory, name)
/* Save time in some common cases - as long as default_directory
is not relative, it can be canonicalized with name below (if it
is needed at all) without requiring it to be expanded now. */
#ifdef DOS_NT
/* Detect MSDOS file names with drive specifiers. */
&& ! (IS_DRIVE (o[0]) && IS_DEVICE_SEP (o[1])
&& IS_DIRECTORY_SEP (o[2]))
#ifdef WINDOWSNT
/* Detect Windows file names in UNC format. */
&& ! (IS_DIRECTORY_SEP (o[0]) && IS_DIRECTORY_SEP (o[1]))
#endif
#else /* not DOS_NT */
/* Detect Unix absolute file names (/... alone is not absolute on
DOS or Windows). */
&& ! (IS_DIRECTORY_SEP (o[0]))
#endif /* not DOS_NT */
)
{
struct gcpro gcpro1;
GCPRO1 (name);
default_directory = Fexpand_file_name (default_directory, Qnil);
UNGCPRO;
}
}
multibyte = STRING_MULTIBYTE (name);
if (multibyte != STRING_MULTIBYTE (default_directory))
{
if (multibyte)
{
unsigned char *p = SDATA (name);
while (*p && ASCII_BYTE_P (*p))
p++;
if (*p == '\0')
{
/* NAME is a pure ASCII string, and DEFAULT_DIRECTORY is
unibyte. Do not convert DEFAULT_DIRECTORY to
multibyte; instead, convert NAME to a unibyte string,
so that the result of this function is also a unibyte
string. This is needed during bootstrapping and
dumping, when Emacs cannot decode file names, because
the locale environment is not set up. */
name = make_unibyte_string (SSDATA (name), SBYTES (name));
multibyte = 0;
}
else
default_directory = string_to_multibyte (default_directory);
}
else
{
name = string_to_multibyte (name);
multibyte = 1;
}
}
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
default_directory = Fdowncase (default_directory);
#endif
/* Make a local copy of nm[] to protect it from GC in DECODE_FILE below. */
nm = xlispstrdupa (name);
#ifdef DOS_NT
/* Note if special escape prefix is present, but remove for now. */
if (nm[0] == '/' && nm[1] == ':')
{
is_escaped = 1;
nm += 2;
}
/* Find and remove drive specifier if present; this makes nm absolute
even if the rest of the name appears to be relative. Only look for
drive specifier at the beginning. */
if (IS_DRIVE (nm[0]) && IS_DEVICE_SEP (nm[1]))
{
drive = (unsigned char) nm[0];
nm += 2;
}
#ifdef WINDOWSNT
/* If we see "c://somedir", we want to strip the first slash after the
colon when stripping the drive letter. Otherwise, this expands to
"//somedir". */
if (drive && IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1]))
nm++;
/* Discard any previous drive specifier if nm is now in UNC format. */
if (IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])
&& !IS_DIRECTORY_SEP (nm[2]))
drive = 0;
#endif /* WINDOWSNT */
#endif /* DOS_NT */
/* If nm is absolute, look for `/./' or `/../' or `//''sequences; if
none are found, we can probably return right away. We will avoid
allocating a new string if name is already fully expanded. */
if (
IS_DIRECTORY_SEP (nm[0])
#ifdef MSDOS
&& drive && !is_escaped
#endif
#ifdef WINDOWSNT
&& (drive || IS_DIRECTORY_SEP (nm[1])) && !is_escaped
#endif
)
{
/* If it turns out that the filename we want to return is just a
suffix of FILENAME, we don't need to go through and edit
things; we just need to construct a new string using data
starting at the middle of FILENAME. If we set LOSE, that
means we've discovered that we can't do that cool trick. */
bool lose = 0;
char *p = nm;
while (*p)
{
/* Since we know the name is absolute, we can assume that each
element starts with a "/". */
/* "." and ".." are hairy. */
if (IS_DIRECTORY_SEP (p[0])
&& p[1] == '.'
&& (IS_DIRECTORY_SEP (p[2])
|| p[2] == 0
|| (p[2] == '.' && (IS_DIRECTORY_SEP (p[3])
|| p[3] == 0))))
lose = 1;
/* Replace multiple slashes with a single one, except
leave leading "//" alone. */
else if (IS_DIRECTORY_SEP (p[0])
&& IS_DIRECTORY_SEP (p[1])
&& (p != nm || IS_DIRECTORY_SEP (p[2])))
lose = 1;
p++;
}
if (!lose)
{
#ifdef DOS_NT
/* Make sure directories are all separated with /, but
avoid allocation of a new string when not required. */
dostounix_filename (nm);
#ifdef WINDOWSNT
if (IS_DIRECTORY_SEP (nm[1]))
{
if (strcmp (nm, SSDATA (name)) != 0)
name = make_specified_string (nm, -1, strlen (nm), multibyte);
}
else
#endif
/* Drive must be set, so this is okay. */
if (strcmp (nm - 2, SSDATA (name)) != 0)
{
char temp[] = " :";
name = make_specified_string (nm, -1, p - nm, multibyte);
temp[0] = DRIVE_LETTER (drive);
name = concat2 (build_string (temp), name);
}
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
name = Fdowncase (name);
#endif
return name;
#else /* not DOS_NT */
if (strcmp (nm, SSDATA (name)) == 0)
return name;
return make_specified_string (nm, -1, strlen (nm), multibyte);
#endif /* not DOS_NT */
}
}
/* At this point, nm might or might not be an absolute file name. We
need to expand ~ or ~user if present, otherwise prefix nm with
default_directory if nm is not absolute, and finally collapse /./
and /foo/../ sequences.
We set newdir to be the appropriate prefix if one is needed:
- the relevant user directory if nm starts with ~ or ~user
- the specified drive's working dir (DOS/NT only) if nm does not
start with /
- the value of default_directory.
Note that these prefixes are not guaranteed to be absolute (except
for the working dir of a drive). Therefore, to ensure we always
return an absolute name, if the final prefix is not absolute we
append it to the current working directory. */
newdir = 0;
if (nm[0] == '~') /* prefix ~ */
{
if (IS_DIRECTORY_SEP (nm[1])
|| nm[1] == 0) /* ~ by itself */
{
Lisp_Object tem;
if (!(newdir = egetenv ("HOME")))
newdir = "";
nm++;
/* `egetenv' may return a unibyte string, which will bite us since
we expect the directory to be multibyte. */
#ifdef WINDOWSNT
if (newdir[0])
{
char newdir_utf8[MAX_UTF8_PATH];
filename_from_ansi (newdir, newdir_utf8);
tem = make_unibyte_string (newdir_utf8, strlen (newdir_utf8));
}
else
#endif
tem = build_string (newdir);
if (multibyte && !STRING_MULTIBYTE (tem))
{
hdir = DECODE_FILE (tem);
newdir = SSDATA (hdir);
}
#ifdef DOS_NT
collapse_newdir = 0;
#endif
}
else /* ~user/filename */
{
char *o, *p;
for (p = nm; *p && !IS_DIRECTORY_SEP (*p); p++)
continue;
o = SAFE_ALLOCA (p - nm + 1);
memcpy (o, nm, p - nm);
o[p - nm] = 0;
block_input ();
pw = getpwnam (o + 1);
unblock_input ();
if (pw)
{
Lisp_Object tem;
newdir = pw->pw_dir;
/* `getpwnam' may return a unibyte string, which will
bite us since we expect the directory to be
multibyte. */
tem = make_unibyte_string (newdir, strlen (newdir));
if (multibyte && !STRING_MULTIBYTE (tem))
{
hdir = DECODE_FILE (tem);
newdir = SSDATA (hdir);
}
nm = p;
#ifdef DOS_NT
collapse_newdir = 0;
#endif
}
/* If we don't find a user of that name, leave the name
unchanged; don't move nm forward to p. */
}
}
#ifdef DOS_NT
/* On DOS and Windows, nm is absolute if a drive name was specified;
use the drive's current directory as the prefix if needed. */
if (!newdir && drive)
{
/* Get default directory if needed to make nm absolute. */
char *adir = NULL;
if (!IS_DIRECTORY_SEP (nm[0]))
{
adir = alloca (MAXPATHLEN + 1);
if (!getdefdir (c_toupper (drive) - 'A' + 1, adir))
adir = NULL;
else if (multibyte)
{
Lisp_Object tem = build_string (adir);
tem = DECODE_FILE (tem);
memcpy (adir, SSDATA (tem), SBYTES (tem) + 1);
}
}
if (!adir)
{
/* Either nm starts with /, or drive isn't mounted. */
adir = alloca (4);
adir[0] = DRIVE_LETTER (drive);
adir[1] = ':';
adir[2] = '/';
adir[3] = 0;
}
newdir = adir;
}
#endif /* DOS_NT */
/* Finally, if no prefix has been specified and nm is not absolute,
then it must be expanded relative to default_directory. */
if (1
#ifndef DOS_NT
/* /... alone is not absolute on DOS and Windows. */
&& !IS_DIRECTORY_SEP (nm[0])
#endif
#ifdef WINDOWSNT
&& !(IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])
&& !IS_DIRECTORY_SEP (nm[2]))
#endif
&& !newdir)
{
newdir = SSDATA (default_directory);
#ifdef DOS_NT
/* Note if special escape prefix is present, but remove for now. */
if (newdir[0] == '/' && newdir[1] == ':')
{
is_escaped = 1;
newdir += 2;
}
#endif
}
#ifdef DOS_NT
if (newdir)
{
/* First ensure newdir is an absolute name. */
if (
/* Detect MSDOS file names with drive specifiers. */
! (IS_DRIVE (newdir[0])
&& IS_DEVICE_SEP (newdir[1]) && IS_DIRECTORY_SEP (newdir[2]))
#ifdef WINDOWSNT
/* Detect Windows file names in UNC format. */
&& ! (IS_DIRECTORY_SEP (newdir[0]) && IS_DIRECTORY_SEP (newdir[1])
&& !IS_DIRECTORY_SEP (newdir[2]))
#endif
)
{
/* Effectively, let newdir be (expand-file-name newdir cwd).
Because of the admonition against calling expand-file-name
when we have pointers into lisp strings, we accomplish this
indirectly by prepending newdir to nm if necessary, and using
cwd (or the wd of newdir's drive) as the new newdir. */
char *adir;
#ifdef WINDOWSNT
const int adir_size = MAX_UTF8_PATH;
#else
const int adir_size = MAXPATHLEN + 1;
#endif
if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1]))
{
drive = (unsigned char) newdir[0];
newdir += 2;
}
if (!IS_DIRECTORY_SEP (nm[0]))
{
ptrdiff_t newlen = strlen (newdir);
char *tmp = alloca (newlen + file_name_as_directory_slop
+ strlen (nm) + 1);
file_name_as_directory (tmp, newdir, newlen, multibyte);
strcat (tmp, nm);
nm = tmp;
}
adir = alloca (adir_size);
if (drive)
{
if (!getdefdir (c_toupper (drive) - 'A' + 1, adir))
strcpy (adir, "/");
}
else
getcwd (adir, adir_size);
if (multibyte)
{
Lisp_Object tem = build_string (adir);
tem = DECODE_FILE (tem);
memcpy (adir, SSDATA (tem), SBYTES (tem) + 1);
}
newdir = adir;
}
/* Strip off drive name from prefix, if present. */
if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1]))
{
drive = newdir[0];
newdir += 2;
}
/* Keep only a prefix from newdir if nm starts with slash
(//server/share for UNC, nothing otherwise). */
if (IS_DIRECTORY_SEP (nm[0]) && collapse_newdir)
{
#ifdef WINDOWSNT
if (IS_DIRECTORY_SEP (newdir[0]) && IS_DIRECTORY_SEP (newdir[1])
&& !IS_DIRECTORY_SEP (newdir[2]))
{
char *adir = strcpy (alloca (strlen (newdir) + 1), newdir);
char *p = adir + 2;
while (*p && !IS_DIRECTORY_SEP (*p)) p++;
p++;
while (*p && !IS_DIRECTORY_SEP (*p)) p++;
*p = 0;
newdir = adir;
}
else
#endif
newdir = "";
}
}
#endif /* DOS_NT */
if (newdir)
{
/* Ignore any slash at the end of newdir, unless newdir is
just "/" or "//". */
length = strlen (newdir);
while (length > 1 && IS_DIRECTORY_SEP (newdir[length - 1])
&& ! (length == 2 && IS_DIRECTORY_SEP (newdir[0])))
length--;
}
else
length = 0;
/* Now concatenate the directory and name to new space in the stack frame. */
tlen = length + file_name_as_directory_slop + strlen (nm) + 1;
#ifdef DOS_NT
/* Reserve space for drive specifier and escape prefix, since either
or both may need to be inserted. (The Microsoft x86 compiler
produces incorrect code if the following two lines are combined.) */
target = alloca (tlen + 4);
target += 4;
#else /* not DOS_NT */
target = SAFE_ALLOCA (tlen);
#endif /* not DOS_NT */
*target = 0;
if (newdir)
{
if (nm[0] == 0 || IS_DIRECTORY_SEP (nm[0]))
{
#ifdef DOS_NT
/* If newdir is effectively "C:/", then the drive letter will have
been stripped and newdir will be "/". Concatenating with an
absolute directory in nm produces "//", which will then be
incorrectly treated as a network share. Ignore newdir in
this case (keeping the drive letter). */
if (!(drive && nm[0] && IS_DIRECTORY_SEP (newdir[0])
&& newdir[1] == '\0'))
#endif
{
memcpy (target, newdir, length);
target[length] = 0;
}
}
else
file_name_as_directory (target, newdir, length, multibyte);
}
strcat (target, nm);
/* Now canonicalize by removing `//', `/.' and `/foo/..' if they
appear. */
{
char *p = target;
char *o = target;
while (*p)
{
if (!IS_DIRECTORY_SEP (*p))
{
*o++ = *p++;
}
else if (p[1] == '.'
&& (IS_DIRECTORY_SEP (p[2])
|| p[2] == 0))
{
/* If "/." is the entire filename, keep the "/". Otherwise,
just delete the whole "/.". */
if (o == target && p[2] == '\0')
*o++ = *p;
p += 2;
}
else if (p[1] == '.' && p[2] == '.'
/* `/../' is the "superroot" on certain file systems.
Turned off on DOS_NT systems because they have no
"superroot" and because this causes us to produce
file names like "d:/../foo" which fail file-related
functions of the underlying OS. (To reproduce, try a
long series of "../../" in default_directory, longer
than the number of levels from the root.) */
#ifndef DOS_NT
&& o != target
#endif
&& (IS_DIRECTORY_SEP (p[3]) || p[3] == 0))
{
#ifdef WINDOWSNT
char *prev_o = o;
#endif
while (o != target && (--o, !IS_DIRECTORY_SEP (*o)))
continue;
#ifdef WINDOWSNT
/* Don't go below server level in UNC filenames. */
if (o == target + 1 && IS_DIRECTORY_SEP (*o)
&& IS_DIRECTORY_SEP (*target))
o = prev_o;
else
#endif
/* Keep initial / only if this is the whole name. */
if (o == target && IS_ANY_SEP (*o) && p[3] == 0)
++o;
p += 3;
}
else if (IS_DIRECTORY_SEP (p[1])
&& (p != target || IS_DIRECTORY_SEP (p[2])))
/* Collapse multiple "/", except leave leading "//" alone. */
p++;
else
{
*o++ = *p++;
}
}
#ifdef DOS_NT
/* At last, set drive name. */
#ifdef WINDOWSNT
/* Except for network file name. */
if (!(IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1])))
#endif /* WINDOWSNT */
{
if (!drive) emacs_abort ();
target -= 2;
target[0] = DRIVE_LETTER (drive);
target[1] = ':';
}
/* Reinsert the escape prefix if required. */
if (is_escaped)
{
target -= 2;
target[0] = '/';
target[1] = ':';
}
result = make_specified_string (target, -1, o - target, multibyte);
dostounix_filename (SSDATA (result));
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
result = Fdowncase (result);
#endif
#else /* !DOS_NT */
result = make_specified_string (target, -1, o - target, multibyte);
#endif /* !DOS_NT */
}
/* Again look to see if the file name has special constructs in it
and perhaps call the corresponding file handler. This is needed
for filenames such as "/foo/../user@host:/bar/../baz". Expanding
the ".." component gives us "/user@host:/bar/../baz" which needs
to be expanded again. */
handler = Ffind_file_name_handler (result, Qexpand_file_name);
if (!NILP (handler))
{
handled_name = call3 (handler, Qexpand_file_name,
result, default_directory);
if (! STRINGP (handled_name))
error ("Invalid handler in `file-name-handler-alist'");
result = handled_name;
}
SAFE_FREE ();
return result;
}
#if 0
/* PLEASE DO NOT DELETE THIS COMMENTED-OUT VERSION!
This is the old version of expand-file-name, before it was thoroughly
rewritten for Emacs 10.31. We leave this version here commented-out,
because the code is very complex and likely to have subtle bugs. If
bugs _are_ found, it might be of interest to look at the old code and
see what did it do in the relevant situation.
Don't remove this code: it's true that it will be accessible
from the repository, but a few years from deletion, people will
forget it is there. */
/* Changed this DEFUN to a DEAFUN, so as not to confuse `make-docfile'. */
DEAFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0,
"Convert FILENAME to absolute, and canonicalize it.\n\
Second arg DEFAULT is directory to start with if FILENAME is relative\n\
\(does not start with slash); if DEFAULT is nil or missing,\n\
the current buffer's value of default-directory is used.\n\
Filenames containing `.' or `..' as components are simplified;\n\
initial `~/' expands to your home directory.\n\
See also the function `substitute-in-file-name'.")
(name, defalt)
Lisp_Object name, defalt;
{
unsigned char *nm;
register unsigned char *newdir, *p, *o;
ptrdiff_t tlen;
unsigned char *target;
struct passwd *pw;
CHECK_STRING (name);
nm = SDATA (name);
/* If nm is absolute, flush ...// and detect /./ and /../.
If no /./ or /../ we can return right away. */
if (nm[0] == '/')
{
bool lose = 0;
p = nm;
while (*p)
{
if (p[0] == '/' && p[1] == '/')
nm = p + 1;
if (p[0] == '/' && p[1] == '~')
nm = p + 1, lose = 1;
if (p[0] == '/' && p[1] == '.'
&& (p[2] == '/' || p[2] == 0
|| (p[2] == '.' && (p[3] == '/' || p[3] == 0))))
lose = 1;
p++;
}
if (!lose)
{
if (nm == SDATA (name))
return name;
return build_string (nm);
}
}
/* Now determine directory to start with and put it in NEWDIR. */
newdir = 0;
if (nm[0] == '~') /* prefix ~ */
if (nm[1] == '/' || nm[1] == 0)/* ~/filename */
{
if (!(newdir = (unsigned char *) egetenv ("HOME")))
newdir = (unsigned char *) "";
nm++;
}
else /* ~user/filename */
{
/* Get past ~ to user. */
unsigned char *user = nm + 1;
/* Find end of name. */
unsigned char *ptr = (unsigned char *) strchr (user, '/');
ptrdiff_t len = ptr ? ptr - user : strlen (user);
/* Copy the user name into temp storage. */
o = alloca (len + 1);
memcpy (o, user, len);
o[len] = 0;
/* Look up the user name. */
block_input ();
pw = (struct passwd *) getpwnam (o + 1);
unblock_input ();
if (!pw)
error ("\"%s\" isn't a registered user", o + 1);
newdir = (unsigned char *) pw->pw_dir;
/* Discard the user name from NM. */
nm += len;
}
if (nm[0] != '/' && !newdir)
{
if (NILP (defalt))
defalt = current_buffer->directory;
CHECK_STRING (defalt);
newdir = SDATA (defalt);
}
/* Now concatenate the directory and name to new space in the stack frame. */
tlen = (newdir ? strlen (newdir) + 1 : 0) + strlen (nm) + 1;
target = alloca (tlen);
*target = 0;
if (newdir)
{
if (nm[0] == 0 || nm[0] == '/')
strcpy (target, newdir);
else
file_name_as_directory (target, newdir);
}
strcat (target, nm);
/* Now canonicalize by removing /. and /foo/.. if they appear. */
p = target;
o = target;
while (*p)
{
if (*p != '/')
{
*o++ = *p++;
}
else if (!strncmp (p, "//", 2)
)
{
o = target;
p++;
}
else if (p[0] == '/' && p[1] == '.'
&& (p[2] == '/' || p[2] == 0))
p += 2;
else if (!strncmp (p, "/..", 3)
/* `/../' is the "superroot" on certain file systems. */
&& o != target
&& (p[3] == '/' || p[3] == 0))
{
while (o != target && *--o != '/')
;
if (o == target && *o == '/')
++o;
p += 3;
}
else
{
*o++ = *p++;
}
}
return make_string (target, o - target);
}
#endif
/* If /~ or // appears, discard everything through first slash. */
static bool
file_name_absolute_p (const char *filename)
{
return
(IS_DIRECTORY_SEP (*filename) || *filename == '~'
#ifdef DOS_NT
|| (IS_DRIVE (*filename) && IS_DEVICE_SEP (filename[1])
&& IS_DIRECTORY_SEP (filename[2]))
#endif
);
}
static char *
search_embedded_absfilename (char *nm, char *endp)
{
char *p, *s;
for (p = nm + 1; p < endp; p++)
{
if (IS_DIRECTORY_SEP (p[-1])
&& file_name_absolute_p (p)
#if defined (WINDOWSNT) || defined (CYGWIN)
/* // at start of file name is meaningful in Apollo,
WindowsNT and Cygwin systems. */
&& !(IS_DIRECTORY_SEP (p[0]) && p - 1 == nm)
#endif /* not (WINDOWSNT || CYGWIN) */
)
{
for (s = p; *s && !IS_DIRECTORY_SEP (*s); s++);
if (p[0] == '~' && s > p + 1) /* We've got "/~something/". */
{
char *o = alloca (s - p + 1);
struct passwd *pw;
memcpy (o, p, s - p);
o [s - p] = 0;
/* If we have ~user and `user' exists, discard
everything up to ~. But if `user' does not exist, leave
~user alone, it might be a literal file name. */
block_input ();
pw = getpwnam (o + 1);
unblock_input ();
if (pw)
return p;
}
else
return p;
}
}
return NULL;
}
DEFUN ("substitute-in-file-name", Fsubstitute_in_file_name,
Ssubstitute_in_file_name, 1, 1, 0,
doc: /* Substitute environment variables referred to in FILENAME.
`$FOO' where FOO is an environment variable name means to substitute
the value of that variable. The variable name should be terminated
with a character not a letter, digit or underscore; otherwise, enclose
the entire variable name in braces.
If `/~' appears, all of FILENAME through that `/' is discarded.
If `//' appears, everything up to and including the first of
those `/' is discarded. */)
(Lisp_Object filename)
{
char *nm, *p, *x, *endp;
bool substituted = false;
bool multibyte;
char *xnm;
Lisp_Object handler;
CHECK_STRING (filename);
multibyte = STRING_MULTIBYTE (filename);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qsubstitute_in_file_name);
if (!NILP (handler))
{
Lisp_Object handled_name = call2 (handler, Qsubstitute_in_file_name,
filename);
if (STRINGP (handled_name))
return handled_name;
error ("Invalid handler in `file-name-handler-alist'");
}
/* Always work on a copy of the string, in case GC happens during
decode of environment variables, causing the original Lisp_String
data to be relocated. */
nm = xlispstrdupa (filename);
#ifdef DOS_NT
dostounix_filename (nm);
substituted = (memcmp (nm, SDATA (filename), SBYTES (filename)) != 0);
#endif
endp = nm + SBYTES (filename);
/* If /~ or // appears, discard everything through first slash. */
p = search_embedded_absfilename (nm, endp);
if (p)
/* Start over with the new string, so we check the file-name-handler
again. Important with filenames like "/home/foo//:/hello///there"
which would substitute to "/:/hello///there" rather than "/there". */
return Fsubstitute_in_file_name
(make_specified_string (p, -1, endp - p, multibyte));
/* See if any variables are substituted into the string. */
if (!NILP (Ffboundp (Qsubstitute_env_in_file_name)))
{
Lisp_Object name
= (!substituted ? filename
: make_specified_string (nm, -1, endp - nm, multibyte));
Lisp_Object tmp = call1 (Qsubstitute_env_in_file_name, name);
CHECK_STRING (tmp);
if (!EQ (tmp, name))
substituted = true;
filename = tmp;
}
if (!substituted)
{
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
filename = Fdowncase (filename);
#endif
return filename;
}
xnm = SSDATA (filename);
x = xnm + SBYTES (filename);
/* If /~ or // appears, discard everything through first slash. */
while ((p = search_embedded_absfilename (xnm, x)) != NULL)
/* This time we do not start over because we've already expanded envvars
and replaced $$ with $. Maybe we should start over as well, but we'd
need to quote some $ to $$ first. */
xnm = p;
#ifdef WINDOWSNT
if (!NILP (Vw32_downcase_file_names))
{
Lisp_Object xname = make_specified_string (xnm, -1, x - xnm, multibyte);
xname = Fdowncase (xname);
return xname;
}
else
#endif
return (xnm == SSDATA (filename)
? filename
: make_specified_string (xnm, -1, x - xnm, multibyte));
}
/* A slightly faster and more convenient way to get
(directory-file-name (expand-file-name FOO)). */
Lisp_Object
expand_and_dir_to_file (Lisp_Object filename, Lisp_Object defdir)
{
register Lisp_Object absname;
absname = Fexpand_file_name (filename, defdir);
/* Remove final slash, if any (unless this is the root dir).
stat behaves differently depending! */
if (SCHARS (absname) > 1
&& IS_DIRECTORY_SEP (SREF (absname, SBYTES (absname) - 1))
&& !IS_DEVICE_SEP (SREF (absname, SBYTES (absname) - 2)))
/* We cannot take shortcuts; they might be wrong for magic file names. */
absname = Fdirectory_file_name (absname);
return absname;
}
/* Signal an error if the file ABSNAME already exists.
If KNOWN_TO_EXIST, the file is known to exist.
QUERYSTRING is a name for the action that is being considered
to alter the file.
If INTERACTIVE, ask the user whether to proceed,
and bypass the error if the user says to go ahead.
If QUICK, ask for y or n, not yes or no. */
static void
barf_or_query_if_file_exists (Lisp_Object absname, bool known_to_exist,
const char *querystring, bool interactive,
bool quick)
{
Lisp_Object tem, encoded_filename;
struct stat statbuf;
struct gcpro gcpro1;
encoded_filename = ENCODE_FILE (absname);
if (! known_to_exist && lstat (SSDATA (encoded_filename), &statbuf) == 0)
{
if (S_ISDIR (statbuf.st_mode))
xsignal2 (Qfile_error,
build_string ("File is a directory"), absname);
known_to_exist = true;
}
if (known_to_exist)
{
if (! interactive)
xsignal2 (Qfile_already_exists,
build_string ("File already exists"), absname);
GCPRO1 (absname);
tem = format2 ("File %s already exists; %s anyway? ",
absname, build_string (querystring));
if (quick)
tem = call1 (intern ("y-or-n-p"), tem);
else
tem = do_yes_or_no_p (tem);
UNGCPRO;
if (NILP (tem))
xsignal2 (Qfile_already_exists,
build_string ("File already exists"), absname);
}
}
DEFUN ("copy-file", Fcopy_file, Scopy_file, 2, 6,
"fCopy file: \nGCopy %s to file: \np\nP",
doc: /* Copy FILE to NEWNAME. Both args must be strings.
If NEWNAME names a directory, copy FILE there.
This function always sets the file modes of the output file to match
the input file.
The optional third argument OK-IF-ALREADY-EXISTS specifies what to do
if file NEWNAME already exists. If OK-IF-ALREADY-EXISTS is nil, we
signal a `file-already-exists' error without overwriting. If
OK-IF-ALREADY-EXISTS is a number, we request confirmation from the user
about overwriting; this is what happens in interactive use with M-x.
Any other value for OK-IF-ALREADY-EXISTS means to overwrite the
existing file.
Fourth arg KEEP-TIME non-nil means give the output file the same
last-modified time as the old one. (This works on only some systems.)
A prefix arg makes KEEP-TIME non-nil.
If PRESERVE-UID-GID is non-nil, we try to transfer the
uid and gid of FILE to NEWNAME.
If PRESERVE-PERMISSIONS is non-nil, copy permissions of FILE to NEWNAME;
this includes the file modes, along with ACL entries and SELinux
context if present. Otherwise, if NEWNAME is created its file
permission bits are those of FILE, masked by the default file
permissions. */)
(Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists,
Lisp_Object keep_time, Lisp_Object preserve_uid_gid,
Lisp_Object preserve_permissions)
{
Lisp_Object handler;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
ptrdiff_t count = SPECPDL_INDEX ();
Lisp_Object encoded_file, encoded_newname;
#if HAVE_LIBSELINUX
security_context_t con;
int conlength = 0;
#endif
#ifdef WINDOWSNT
int result;
#else
bool already_exists = false;
mode_t new_mask;
int ifd, ofd;
int n;
char buf[16 * 1024];
struct stat st;
#endif
encoded_file = encoded_newname = Qnil;
GCPRO4 (file, newname, encoded_file, encoded_newname);
CHECK_STRING (file);
CHECK_STRING (newname);
if (!NILP (Ffile_directory_p (newname)))
newname = Fexpand_file_name (Ffile_name_nondirectory (file), newname);
else
newname = Fexpand_file_name (newname, Qnil);
file = Fexpand_file_name (file, Qnil);
/* If the input file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (file, Qcopy_file);
/* Likewise for output file name. */
if (NILP (handler))
handler = Ffind_file_name_handler (newname, Qcopy_file);
if (!NILP (handler))
RETURN_UNGCPRO (call7 (handler, Qcopy_file, file, newname,
ok_if_already_exists, keep_time, preserve_uid_gid,
preserve_permissions));
encoded_file = ENCODE_FILE (file);
encoded_newname = ENCODE_FILE (newname);
#ifdef WINDOWSNT
if (NILP (ok_if_already_exists)
|| INTEGERP (ok_if_already_exists))
barf_or_query_if_file_exists (newname, false, "copy to it",
INTEGERP (ok_if_already_exists), false);
result = w32_copy_file (SSDATA (encoded_file), SSDATA (encoded_newname),
!NILP (keep_time), !NILP (preserve_uid_gid),
!NILP (preserve_permissions));
switch (result)
{
case -1:
report_file_error ("Copying file", list2 (file, newname));
case -2:
report_file_error ("Copying permissions from", file);
case -3:
xsignal2 (Qfile_date_error,
build_string ("Resetting file times"), newname);
case -4:
report_file_error ("Copying permissions to", newname);
}
#else /* not WINDOWSNT */
immediate_quit = 1;
ifd = emacs_open (SSDATA (encoded_file), O_RDONLY, 0);
immediate_quit = 0;
if (ifd < 0)
report_file_error ("Opening input file", file);
record_unwind_protect_int (close_file_unwind, ifd);
if (fstat (ifd, &st) != 0)
report_file_error ("Input file status", file);
if (!NILP (preserve_permissions))
{
#if HAVE_LIBSELINUX
if (is_selinux_enabled ())
{
conlength = fgetfilecon (ifd, &con);
if (conlength == -1)
report_file_error ("Doing fgetfilecon", file);
}
#endif
}
/* We can copy only regular files. */
if (!S_ISREG (st.st_mode))
report_file_errno ("Non-regular file", file,
S_ISDIR (st.st_mode) ? EISDIR : EINVAL);
#ifndef MSDOS
new_mask = st.st_mode & (!NILP (preserve_uid_gid) ? 0700 : 0777);
#else
new_mask = S_IREAD | S_IWRITE;
#endif
ofd = emacs_open (SSDATA (encoded_newname), O_WRONLY | O_CREAT | O_EXCL,
new_mask);
if (ofd < 0 && errno == EEXIST)
{
if (NILP (ok_if_already_exists) || INTEGERP (ok_if_already_exists))
barf_or_query_if_file_exists (newname, true, "copy to it",
INTEGERP (ok_if_already_exists), false);
already_exists = true;
ofd = emacs_open (SSDATA (encoded_newname), O_WRONLY, 0);
}
if (ofd < 0)
report_file_error ("Opening output file", newname);
record_unwind_protect_int (close_file_unwind, ofd);
if (already_exists)
{
struct stat out_st;
if (fstat (ofd, &out_st) != 0)
report_file_error ("Output file status", newname);
if (st.st_dev == out_st.st_dev && st.st_ino == out_st.st_ino)
report_file_errno ("Input and output files are the same",
list2 (file, newname), 0);
if (ftruncate (ofd, 0) != 0)
report_file_error ("Truncating output file", newname);
}
immediate_quit = 1;
QUIT;
while ((n = emacs_read (ifd, buf, sizeof buf)) > 0)
if (emacs_write_sig (ofd, buf, n) != n)
report_file_error ("Write error", newname);
immediate_quit = 0;
#ifndef MSDOS
/* Preserve the original file permissions, and if requested, also its
owner and group. */
{
mode_t preserved_permissions = st.st_mode & 07777;
mode_t default_permissions = st.st_mode & 0777 & ~realmask;
if (!NILP (preserve_uid_gid))
{
/* Attempt to change owner and group. If that doesn't work
attempt to change just the group, as that is sometimes allowed.
Adjust the mode mask to eliminate setuid or setgid bits
or group permissions bits that are inappropriate if the
owner or group are wrong. */
if (fchown (ofd, st.st_uid, st.st_gid) != 0)
{
if (fchown (ofd, -1, st.st_gid) == 0)
preserved_permissions &= ~04000;
else
{
preserved_permissions &= ~06000;
/* Copy the other bits to the group bits, since the
group is wrong. */
preserved_permissions &= ~070;
preserved_permissions |= (preserved_permissions & 7) << 3;
default_permissions &= ~070;
default_permissions |= (default_permissions & 7) << 3;
}
}
}
switch (!NILP (preserve_permissions)
? qcopy_acl (SSDATA (encoded_file), ifd,
SSDATA (encoded_newname), ofd,
preserved_permissions)
: (already_exists
|| (new_mask & ~realmask) == default_permissions)
? 0
: fchmod (ofd, default_permissions))
{
case -2: report_file_error ("Copying permissions from", file);
case -1: report_file_error ("Copying permissions to", newname);
}
}
#endif /* not MSDOS */
#if HAVE_LIBSELINUX
if (conlength > 0)
{
/* Set the modified context back to the file. */
bool fail = fsetfilecon (ofd, con) != 0;
/* See http://debbugs.gnu.org/11245 for ENOTSUP. */
if (fail && errno != ENOTSUP)
report_file_error ("Doing fsetfilecon", newname);
freecon (con);
}
#endif
if (!NILP (keep_time))
{
struct timespec atime = get_stat_atime (&st);
struct timespec mtime = get_stat_mtime (&st);
if (set_file_times (ofd, SSDATA (encoded_newname), atime, mtime) != 0)
xsignal2 (Qfile_date_error,
build_string ("Cannot set file date"), newname);
}
if (emacs_close (ofd) < 0)
report_file_error ("Write error", newname);
emacs_close (ifd);
#ifdef MSDOS
/* In DJGPP v2.0 and later, fstat usually returns true file mode bits,
and if it can't, it tells so. Otherwise, under MSDOS we usually
get only the READ bit, which will make the copied file read-only,
so it's better not to chmod at all. */
if ((_djstat_flags & _STFAIL_WRITEBIT) == 0)
chmod (SDATA (encoded_newname), st.st_mode & 07777);
#endif /* MSDOS */
#endif /* not WINDOWSNT */
/* Discard the unwind protects. */
specpdl_ptr = specpdl + count;
UNGCPRO;
return Qnil;
}
DEFUN ("make-directory-internal", Fmake_directory_internal,
Smake_directory_internal, 1, 1, 0,
doc: /* Create a new directory named DIRECTORY. */)
(Lisp_Object directory)
{
const char *dir;
Lisp_Object handler;
Lisp_Object encoded_dir;
CHECK_STRING (directory);
directory = Fexpand_file_name (directory, Qnil);
handler = Ffind_file_name_handler (directory, Qmake_directory_internal);
if (!NILP (handler))
return call2 (handler, Qmake_directory_internal, directory);
encoded_dir = ENCODE_FILE (directory);
dir = SSDATA (encoded_dir);
#ifdef WINDOWSNT
if (mkdir (dir) != 0)
#else
if (mkdir (dir, 0777 & ~auto_saving_dir_umask) != 0)
#endif
report_file_error ("Creating directory", directory);
return Qnil;
}
DEFUN ("delete-directory-internal", Fdelete_directory_internal,
Sdelete_directory_internal, 1, 1, 0,
doc: /* Delete the directory named DIRECTORY. Does not follow symlinks. */)
(Lisp_Object directory)
{
const char *dir;
Lisp_Object encoded_dir;
CHECK_STRING (directory);
directory = Fdirectory_file_name (Fexpand_file_name (directory, Qnil));
encoded_dir = ENCODE_FILE (directory);
dir = SSDATA (encoded_dir);
if (rmdir (dir) != 0)
report_file_error ("Removing directory", directory);
return Qnil;
}
DEFUN ("delete-file", Fdelete_file, Sdelete_file, 1, 2,
"(list (read-file-name \
(if (and delete-by-moving-to-trash (null current-prefix-arg)) \
\"Move file to trash: \" \"Delete file: \") \
nil default-directory (confirm-nonexistent-file-or-buffer)) \
(null current-prefix-arg))",
doc: /* Delete file named FILENAME. If it is a symlink, remove the symlink.
If file has multiple names, it continues to exist with the other names.
TRASH non-nil means to trash the file instead of deleting, provided
`delete-by-moving-to-trash' is non-nil.
When called interactively, TRASH is t if no prefix argument is given.
With a prefix argument, TRASH is nil. */)
(Lisp_Object filename, Lisp_Object trash)
{
Lisp_Object handler;
Lisp_Object encoded_file;
struct gcpro gcpro1;
GCPRO1 (filename);
if (!NILP (Ffile_directory_p (filename))
&& NILP (Ffile_symlink_p (filename)))
xsignal2 (Qfile_error,
build_string ("Removing old name: is a directory"),
filename);
UNGCPRO;
filename = Fexpand_file_name (filename, Qnil);
handler = Ffind_file_name_handler (filename, Qdelete_file);
if (!NILP (handler))
return call3 (handler, Qdelete_file, filename, trash);
if (delete_by_moving_to_trash && !NILP (trash))
return call1 (Qmove_file_to_trash, filename);
encoded_file = ENCODE_FILE (filename);
if (unlink (SSDATA (encoded_file)) < 0)
report_file_error ("Removing old name", filename);
return Qnil;
}
static Lisp_Object
internal_delete_file_1 (Lisp_Object ignore)
{
return Qt;
}
/* Delete file FILENAME, returning true if successful.
This ignores `delete-by-moving-to-trash'. */
bool
internal_delete_file (Lisp_Object filename)
{
Lisp_Object tem;
tem = internal_condition_case_2 (Fdelete_file, filename, Qnil,
Qt, internal_delete_file_1);
return NILP (tem);
}
DEFUN ("rename-file", Frename_file, Srename_file, 2, 3,
"fRename file: \nGRename %s to file: \np",
doc: /* Rename FILE as NEWNAME. Both args must be strings.
If file has names other than FILE, it continues to have those names.
Signals a `file-already-exists' error if a file NEWNAME already exists
unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
A number as third arg means request confirmation if NEWNAME already exists.
This is what happens in interactive use with M-x. */)
(Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists)
{
Lisp_Object handler;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
Lisp_Object encoded_file, encoded_newname, symlink_target;
symlink_target = encoded_file = encoded_newname = Qnil;
GCPRO5 (file, newname, encoded_file, encoded_newname, symlink_target);
CHECK_STRING (file);
CHECK_STRING (newname);
file = Fexpand_file_name (file, Qnil);
if ((!NILP (Ffile_directory_p (newname)))
#ifdef DOS_NT
/* If the file names are identical but for the case,
don't attempt to move directory to itself. */
&& (NILP (Fstring_equal (Fdowncase (file), Fdowncase (newname))))
#endif
)
{
Lisp_Object fname = (NILP (Ffile_directory_p (file))
? file : Fdirectory_file_name (file));
newname = Fexpand_file_name (Ffile_name_nondirectory (fname), newname);
}
else
newname = Fexpand_file_name (newname, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (file, Qrename_file);
if (NILP (handler))
handler = Ffind_file_name_handler (newname, Qrename_file);
if (!NILP (handler))
RETURN_UNGCPRO (call4 (handler, Qrename_file,
file, newname, ok_if_already_exists));
encoded_file = ENCODE_FILE (file);
encoded_newname = ENCODE_FILE (newname);
#ifdef DOS_NT
/* If the file names are identical but for the case, don't ask for
confirmation: they simply want to change the letter-case of the
file name. */
if (NILP (Fstring_equal (Fdowncase (file), Fdowncase (newname))))
#endif
if (NILP (ok_if_already_exists)
|| INTEGERP (ok_if_already_exists))
barf_or_query_if_file_exists (newname, false, "rename to it",
INTEGERP (ok_if_already_exists), false);
if (rename (SSDATA (encoded_file), SSDATA (encoded_newname)) < 0)
{
int rename_errno = errno;
if (rename_errno == EXDEV)
{
ptrdiff_t count;
symlink_target = Ffile_symlink_p (file);
if (! NILP (symlink_target))
Fmake_symbolic_link (symlink_target, newname,
NILP (ok_if_already_exists) ? Qnil : Qt);
else if (!NILP (Ffile_directory_p (file)))
call4 (Qcopy_directory, file, newname, Qt, Qnil);
else
/* We have already prompted if it was an integer, so don't
have copy-file prompt again. */
Fcopy_file (file, newname,
NILP (ok_if_already_exists) ? Qnil : Qt,
Qt, Qt, Qt);
count = SPECPDL_INDEX ();
specbind (Qdelete_by_moving_to_trash, Qnil);
if (!NILP (Ffile_directory_p (file)) && NILP (symlink_target))
call2 (Qdelete_directory, file, Qt);
else
Fdelete_file (file, Qnil);
unbind_to (count, Qnil);
}
else
report_file_errno ("Renaming", list2 (file, newname), rename_errno);
}
UNGCPRO;
return Qnil;
}
DEFUN ("add-name-to-file", Fadd_name_to_file, Sadd_name_to_file, 2, 3,
"fAdd name to file: \nGName to add to %s: \np",
doc: /* Give FILE additional name NEWNAME. Both args must be strings.
Signals a `file-already-exists' error if a file NEWNAME already exists
unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
A number as third arg means request confirmation if NEWNAME already exists.
This is what happens in interactive use with M-x. */)
(Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists)
{
Lisp_Object handler;
Lisp_Object encoded_file, encoded_newname;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
GCPRO4 (file, newname, encoded_file, encoded_newname);
encoded_file = encoded_newname = Qnil;
CHECK_STRING (file);
CHECK_STRING (newname);
file = Fexpand_file_name (file, Qnil);
if (!NILP (Ffile_directory_p (newname)))
newname = Fexpand_file_name (Ffile_name_nondirectory (file), newname);
else
newname = Fexpand_file_name (newname, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (file, Qadd_name_to_file);
if (!NILP (handler))
RETURN_UNGCPRO (call4 (handler, Qadd_name_to_file, file,
newname, ok_if_already_exists));
/* If the new name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (newname, Qadd_name_to_file);
if (!NILP (handler))
RETURN_UNGCPRO (call4 (handler, Qadd_name_to_file, file,
newname, ok_if_already_exists));
encoded_file = ENCODE_FILE (file);
encoded_newname = ENCODE_FILE (newname);
if (NILP (ok_if_already_exists)
|| INTEGERP (ok_if_already_exists))
barf_or_query_if_file_exists (newname, false, "make it a new name",
INTEGERP (ok_if_already_exists), false);
unlink (SSDATA (newname));
if (link (SSDATA (encoded_file), SSDATA (encoded_newname)) < 0)
{
int link_errno = errno;
report_file_errno ("Adding new name", list2 (file, newname), link_errno);
}
UNGCPRO;
return Qnil;
}
DEFUN ("make-symbolic-link", Fmake_symbolic_link, Smake_symbolic_link, 2, 3,
"FMake symbolic link to file: \nGMake symbolic link to file %s: \np",
doc: /* Make a symbolic link to FILENAME, named LINKNAME.
Both args must be strings.
Signals a `file-already-exists' error if a file LINKNAME already exists
unless optional third argument OK-IF-ALREADY-EXISTS is non-nil.
A number as third arg means request confirmation if LINKNAME already exists.
This happens for interactive use with M-x. */)
(Lisp_Object filename, Lisp_Object linkname, Lisp_Object ok_if_already_exists)
{
Lisp_Object handler;
Lisp_Object encoded_filename, encoded_linkname;
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
GCPRO4 (filename, linkname, encoded_filename, encoded_linkname);
encoded_filename = encoded_linkname = Qnil;
CHECK_STRING (filename);
CHECK_STRING (linkname);
/* If the link target has a ~, we must expand it to get
a truly valid file name. Otherwise, do not expand;
we want to permit links to relative file names. */
if (SREF (filename, 0) == '~')
filename = Fexpand_file_name (filename, Qnil);
if (!NILP (Ffile_directory_p (linkname)))
linkname = Fexpand_file_name (Ffile_name_nondirectory (filename), linkname);
else
linkname = Fexpand_file_name (linkname, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qmake_symbolic_link);
if (!NILP (handler))
RETURN_UNGCPRO (call4 (handler, Qmake_symbolic_link, filename,
linkname, ok_if_already_exists));
/* If the new link name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (linkname, Qmake_symbolic_link);
if (!NILP (handler))
RETURN_UNGCPRO (call4 (handler, Qmake_symbolic_link, filename,
linkname, ok_if_already_exists));
encoded_filename = ENCODE_FILE (filename);
encoded_linkname = ENCODE_FILE (linkname);
if (NILP (ok_if_already_exists)
|| INTEGERP (ok_if_already_exists))
barf_or_query_if_file_exists (linkname, false, "make it a link",
INTEGERP (ok_if_already_exists), false);
if (symlink (SSDATA (encoded_filename), SSDATA (encoded_linkname)) < 0)
{
/* If we didn't complain already, silently delete existing file. */
int symlink_errno;
if (errno == EEXIST)
{
unlink (SSDATA (encoded_linkname));
if (symlink (SSDATA (encoded_filename), SSDATA (encoded_linkname))
>= 0)
{
UNGCPRO;
return Qnil;
}
}
if (errno == ENOSYS)
{
UNGCPRO;
xsignal1 (Qfile_error,
build_string ("Symbolic links are not supported"));
}
symlink_errno = errno;
report_file_errno ("Making symbolic link", list2 (filename, linkname),
symlink_errno);
}
UNGCPRO;
return Qnil;
}
DEFUN ("file-name-absolute-p", Ffile_name_absolute_p, Sfile_name_absolute_p,
1, 1, 0,
doc: /* Return t if file FILENAME specifies an absolute file name.
On Unix, this is a name starting with a `/' or a `~'. */)
(Lisp_Object filename)
{
CHECK_STRING (filename);
return file_name_absolute_p (SSDATA (filename)) ? Qt : Qnil;
}
DEFUN ("file-exists-p", Ffile_exists_p, Sfile_exists_p, 1, 1, 0,
doc: /* Return t if file FILENAME exists (whether or not you can read it.)
See also `file-readable-p' and `file-attributes'.
This returns nil for a symlink to a nonexistent file.
Use `file-symlink-p' to test for such links. */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object handler;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_exists_p);
if (!NILP (handler))
{
Lisp_Object result = call2 (handler, Qfile_exists_p, absname);
errno = 0;
return result;
}
absname = ENCODE_FILE (absname);
return check_existing (SSDATA (absname)) ? Qt : Qnil;
}
DEFUN ("file-executable-p", Ffile_executable_p, Sfile_executable_p, 1, 1, 0,
doc: /* Return t if FILENAME can be executed by you.
For a directory, this means you can access files in that directory.
\(It is generally better to use `file-accessible-directory-p' for that
purpose, though.) */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object handler;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_executable_p);
if (!NILP (handler))
return call2 (handler, Qfile_executable_p, absname);
absname = ENCODE_FILE (absname);
return (check_executable (SSDATA (absname)) ? Qt : Qnil);
}
DEFUN ("file-readable-p", Ffile_readable_p, Sfile_readable_p, 1, 1, 0,
doc: /* Return t if file FILENAME exists and you can read it.
See also `file-exists-p' and `file-attributes'. */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object handler;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_readable_p);
if (!NILP (handler))
return call2 (handler, Qfile_readable_p, absname);
absname = ENCODE_FILE (absname);
return (faccessat (AT_FDCWD, SSDATA (absname), R_OK, AT_EACCESS) == 0
? Qt : Qnil);
}
DEFUN ("file-writable-p", Ffile_writable_p, Sfile_writable_p, 1, 1, 0,
doc: /* Return t if file FILENAME can be written or created by you. */)
(Lisp_Object filename)
{
Lisp_Object absname, dir, encoded;
Lisp_Object handler;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_writable_p);
if (!NILP (handler))
return call2 (handler, Qfile_writable_p, absname);
encoded = ENCODE_FILE (absname);
if (check_writable (SSDATA (encoded), W_OK))
return Qt;
if (errno != ENOENT)
return Qnil;
dir = Ffile_name_directory (absname);
eassert (!NILP (dir));
#ifdef MSDOS
dir = Fdirectory_file_name (dir);
#endif /* MSDOS */
dir = ENCODE_FILE (dir);
#ifdef WINDOWSNT
/* The read-only attribute of the parent directory doesn't affect
whether a file or directory can be created within it. Some day we
should check ACLs though, which do affect this. */
return file_directory_p (SDATA (dir)) ? Qt : Qnil;
#else
return check_writable (SSDATA (dir), W_OK | X_OK) ? Qt : Qnil;
#endif
}
DEFUN ("access-file", Faccess_file, Saccess_file, 2, 2, 0,
doc: /* Access file FILENAME, and get an error if that does not work.
The second argument STRING is used in the error message.
If there is no error, returns nil. */)
(Lisp_Object filename, Lisp_Object string)
{
Lisp_Object handler, encoded_filename, absname;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
CHECK_STRING (string);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qaccess_file);
if (!NILP (handler))
return call3 (handler, Qaccess_file, absname, string);
encoded_filename = ENCODE_FILE (absname);
if (faccessat (AT_FDCWD, SSDATA (encoded_filename), R_OK, AT_EACCESS) != 0)
report_file_error (SSDATA (string), filename);
return Qnil;
}
/* Relative to directory FD, return the symbolic link value of FILENAME.
On failure, return nil. */
Lisp_Object
emacs_readlinkat (int fd, char const *filename)
{
static struct allocator const emacs_norealloc_allocator =
{ xmalloc, NULL, xfree, memory_full };
Lisp_Object val;
char readlink_buf[1024];
char *buf = careadlinkat (fd, filename, readlink_buf, sizeof readlink_buf,
&emacs_norealloc_allocator, readlinkat);
if (!buf)
return Qnil;
val = build_unibyte_string (buf);
if (buf[0] == '/' && strchr (buf, ':'))
val = concat2 (build_unibyte_string ("/:"), val);
if (buf != readlink_buf)
xfree (buf);
val = DECODE_FILE (val);
return val;
}
DEFUN ("file-symlink-p", Ffile_symlink_p, Sfile_symlink_p, 1, 1, 0,
doc: /* Return non-nil if file FILENAME is the name of a symbolic link.
The value is the link target, as a string.
Otherwise it returns nil.
This function does not check whether the link target exists. */)
(Lisp_Object filename)
{
Lisp_Object handler;
CHECK_STRING (filename);
filename = Fexpand_file_name (filename, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qfile_symlink_p);
if (!NILP (handler))
return call2 (handler, Qfile_symlink_p, filename);
filename = ENCODE_FILE (filename);
return emacs_readlinkat (AT_FDCWD, SSDATA (filename));
}
DEFUN ("file-directory-p", Ffile_directory_p, Sfile_directory_p, 1, 1, 0,
doc: /* Return t if FILENAME names an existing directory.
Symbolic links to directories count as directories.
See `file-symlink-p' to distinguish symlinks. */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object handler;
absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_directory_p);
if (!NILP (handler))
return call2 (handler, Qfile_directory_p, absname);
absname = ENCODE_FILE (absname);
return file_directory_p (SSDATA (absname)) ? Qt : Qnil;
}
/* Return true if FILE is a directory or a symlink to a directory. */
bool
file_directory_p (char const *file)
{
#ifdef WINDOWSNT
/* This is cheaper than 'stat'. */
return faccessat (AT_FDCWD, file, D_OK, AT_EACCESS) == 0;
#else
struct stat st;
return stat (file, &st) == 0 && S_ISDIR (st.st_mode);
#endif
}
DEFUN ("file-accessible-directory-p", Ffile_accessible_directory_p,
Sfile_accessible_directory_p, 1, 1, 0,
doc: /* Return t if file FILENAME names a directory you can open.
For the value to be t, FILENAME must specify the name of a directory as a file,
and the directory must allow you to open files in it. In order to use a
directory as a buffer's current directory, this predicate must return true.
A directory name spec may be given instead; then the value is t
if the directory so specified exists and really is a readable and
searchable directory. */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object handler;
CHECK_STRING (filename);
absname = Fexpand_file_name (filename, Qnil);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_accessible_directory_p);
if (!NILP (handler))
{
Lisp_Object r = call2 (handler, Qfile_accessible_directory_p, absname);
errno = 0;
return r;
}
absname = ENCODE_FILE (absname);
return file_accessible_directory_p (SSDATA (absname)) ? Qt : Qnil;
}
/* If FILE is a searchable directory or a symlink to a
searchable directory, return true. Otherwise return
false and set errno to an error number. */
bool
file_accessible_directory_p (char const *file)
{
#ifdef DOS_NT
/* There's no need to test whether FILE is searchable, as the
searchable/executable bit is invented on DOS_NT platforms. */
return file_directory_p (file);
#else
/* On POSIXish platforms, use just one system call; this avoids a
race and is typically faster. */
ptrdiff_t len = strlen (file);
char const *dir;
bool ok;
int saved_errno;
USE_SAFE_ALLOCA;
/* Normally a file "FOO" is an accessible directory if "FOO/." exists.
There are three exceptions: "", "/", and "//". Leave "" alone,
as it's invalid. Append only "." to the other two exceptions as
"/" and "//" are distinct on some platforms, whereas "/", "///",
"////", etc. are all equivalent. */
if (! len)
dir = file;
else
{
/* Just check for trailing '/' when deciding whether to append '/'.
That's simpler than testing the two special cases "/" and "//",
and it's a safe optimization here. */
char *buf = SAFE_ALLOCA (len + 3);
memcpy (buf, file, len);
strcpy (buf + len, &"/."[file[len - 1] == '/']);
dir = buf;
}
ok = check_existing (dir);
saved_errno = errno;
SAFE_FREE ();
errno = saved_errno;
return ok;
#endif
}
DEFUN ("file-regular-p", Ffile_regular_p, Sfile_regular_p, 1, 1, 0,
doc: /* Return t if FILENAME names a regular file.
This is the sort of file that holds an ordinary stream of data bytes.
Symbolic links to regular files count as regular files.
See `file-symlink-p' to distinguish symlinks. */)
(Lisp_Object filename)
{
register Lisp_Object absname;
struct stat st;
Lisp_Object handler;
absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_regular_p);
if (!NILP (handler))
return call2 (handler, Qfile_regular_p, absname);
absname = ENCODE_FILE (absname);
#ifdef WINDOWSNT
{
int result;
Lisp_Object tem = Vw32_get_true_file_attributes;
/* Tell stat to use expensive method to get accurate info. */
Vw32_get_true_file_attributes = Qt;
result = stat (SDATA (absname), &st);
Vw32_get_true_file_attributes = tem;
if (result < 0)
return Qnil;
return S_ISREG (st.st_mode) ? Qt : Qnil;
}
#else
if (stat (SSDATA (absname), &st) < 0)
return Qnil;
return S_ISREG (st.st_mode) ? Qt : Qnil;
#endif
}
DEFUN ("file-selinux-context", Ffile_selinux_context,
Sfile_selinux_context, 1, 1, 0,
doc: /* Return SELinux context of file named FILENAME.
The return value is a list (USER ROLE TYPE RANGE), where the list
elements are strings naming the user, role, type, and range of the
file's SELinux security context.
Return (nil nil nil nil) if the file is nonexistent or inaccessible,
or if SELinux is disabled, or if Emacs lacks SELinux support. */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object values[4];
Lisp_Object handler;
#if HAVE_LIBSELINUX
security_context_t con;
int conlength;
context_t context;
#endif
absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_selinux_context);
if (!NILP (handler))
return call2 (handler, Qfile_selinux_context, absname);
absname = ENCODE_FILE (absname);
values[0] = Qnil;
values[1] = Qnil;
values[2] = Qnil;
values[3] = Qnil;
#if HAVE_LIBSELINUX
if (is_selinux_enabled ())
{
conlength = lgetfilecon (SSDATA (absname), &con);
if (conlength > 0)
{
context = context_new (con);
if (context_user_get (context))
values[0] = build_string (context_user_get (context));
if (context_role_get (context))
values[1] = build_string (context_role_get (context));
if (context_type_get (context))
values[2] = build_string (context_type_get (context));
if (context_range_get (context))
values[3] = build_string (context_range_get (context));
context_free (context);
freecon (con);
}
}
#endif
return Flist (sizeof (values) / sizeof (values[0]), values);
}
DEFUN ("set-file-selinux-context", Fset_file_selinux_context,
Sset_file_selinux_context, 2, 2, 0,
doc: /* Set SELinux context of file named FILENAME to CONTEXT.
CONTEXT should be a list (USER ROLE TYPE RANGE), where the list
elements are strings naming the components of a SELinux context.
Value is t if setting of SELinux context was successful, nil otherwise.
This function does nothing and returns nil if SELinux is disabled,
or if Emacs was not compiled with SELinux support. */)
(Lisp_Object filename, Lisp_Object context)
{
Lisp_Object absname;
Lisp_Object handler;
#if HAVE_LIBSELINUX
Lisp_Object encoded_absname;
Lisp_Object user = CAR_SAFE (context);
Lisp_Object role = CAR_SAFE (CDR_SAFE (context));
Lisp_Object type = CAR_SAFE (CDR_SAFE (CDR_SAFE (context)));
Lisp_Object range = CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (context))));
security_context_t con;
bool fail;
int conlength;
context_t parsed_con;
#endif
absname = Fexpand_file_name (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qset_file_selinux_context);
if (!NILP (handler))
return call3 (handler, Qset_file_selinux_context, absname, context);
#if HAVE_LIBSELINUX
if (is_selinux_enabled ())
{
/* Get current file context. */
encoded_absname = ENCODE_FILE (absname);
conlength = lgetfilecon (SSDATA (encoded_absname), &con);
if (conlength > 0)
{
parsed_con = context_new (con);
/* Change the parts defined in the parameter.*/
if (STRINGP (user))
{
if (context_user_set (parsed_con, SSDATA (user)))
error ("Doing context_user_set");
}
if (STRINGP (role))
{
if (context_role_set (parsed_con, SSDATA (role)))
error ("Doing context_role_set");
}
if (STRINGP (type))
{
if (context_type_set (parsed_con, SSDATA (type)))
error ("Doing context_type_set");
}
if (STRINGP (range))
{
if (context_range_set (parsed_con, SSDATA (range)))
error ("Doing context_range_set");
}
/* Set the modified context back to the file. */
fail = (lsetfilecon (SSDATA (encoded_absname),
context_str (parsed_con))
!= 0);
/* See http://debbugs.gnu.org/11245 for ENOTSUP. */
if (fail && errno != ENOTSUP)
report_file_error ("Doing lsetfilecon", absname);
context_free (parsed_con);
freecon (con);
return fail ? Qnil : Qt;
}
else
report_file_error ("Doing lgetfilecon", absname);
}
#endif
return Qnil;
}
DEFUN ("file-acl", Ffile_acl, Sfile_acl, 1, 1, 0,
doc: /* Return ACL entries of file named FILENAME.
The entries are returned in a format suitable for use in `set-file-acl'
but is otherwise undocumented and subject to change.
Return nil if file does not exist or is not accessible, or if Emacs
was unable to determine the ACL entries. */)
(Lisp_Object filename)
{
Lisp_Object absname;
Lisp_Object handler;
#ifdef HAVE_ACL_SET_FILE
acl_t acl;
Lisp_Object acl_string;
char *str;
# ifndef HAVE_ACL_TYPE_EXTENDED
acl_type_t ACL_TYPE_EXTENDED = ACL_TYPE_ACCESS;
# endif
#endif
absname = expand_and_dir_to_file (filename,
BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_acl);
if (!NILP (handler))
return call2 (handler, Qfile_acl, absname);
#ifdef HAVE_ACL_SET_FILE
absname = ENCODE_FILE (absname);
acl = acl_get_file (SSDATA (absname), ACL_TYPE_EXTENDED);
if (acl == NULL)
return Qnil;
str = acl_to_text (acl, NULL);
if (str == NULL)
{
acl_free (acl);
return Qnil;
}
acl_string = build_string (str);
acl_free (str);
acl_free (acl);
return acl_string;
#endif
return Qnil;
}
DEFUN ("set-file-acl", Fset_file_acl, Sset_file_acl,
2, 2, 0,
doc: /* Set ACL of file named FILENAME to ACL-STRING.
ACL-STRING should contain the textual representation of the ACL
entries in a format suitable for the platform.
Value is t if setting of ACL was successful, nil otherwise.
Setting ACL for local files requires Emacs to be built with ACL
support. */)
(Lisp_Object filename, Lisp_Object acl_string)
{
Lisp_Object absname;
Lisp_Object handler;
#ifdef HAVE_ACL_SET_FILE
Lisp_Object encoded_absname;
acl_t acl;
bool fail;
#endif
absname = Fexpand_file_name (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qset_file_acl);
if (!NILP (handler))
return call3 (handler, Qset_file_acl, absname, acl_string);
#ifdef HAVE_ACL_SET_FILE
if (STRINGP (acl_string))
{
acl = acl_from_text (SSDATA (acl_string));
if (acl == NULL)
{
report_file_error ("Converting ACL", absname);
return Qnil;
}
encoded_absname = ENCODE_FILE (absname);
fail = (acl_set_file (SSDATA (encoded_absname), ACL_TYPE_ACCESS,
acl)
!= 0);
if (fail && acl_errno_valid (errno))
report_file_error ("Setting ACL", absname);
acl_free (acl);
return fail ? Qnil : Qt;
}
#endif
return Qnil;
}
DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 1, 0,
doc: /* Return mode bits of file named FILENAME, as an integer.
Return nil, if file does not exist or is not accessible. */)
(Lisp_Object filename)
{
Lisp_Object absname;
struct stat st;
Lisp_Object handler;
absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qfile_modes);
if (!NILP (handler))
return call2 (handler, Qfile_modes, absname);
absname = ENCODE_FILE (absname);
if (stat (SSDATA (absname), &st) < 0)
return Qnil;
return make_number (st.st_mode & 07777);
}
DEFUN ("set-file-modes", Fset_file_modes, Sset_file_modes, 2, 2,
"(let ((file (read-file-name \"File: \"))) \
(list file (read-file-modes nil file)))",
doc: /* Set mode bits of file named FILENAME to MODE (an integer).
Only the 12 low bits of MODE are used.
Interactively, mode bits are read by `read-file-modes', which accepts
symbolic notation, like the `chmod' command from GNU Coreutils. */)
(Lisp_Object filename, Lisp_Object mode)
{
Lisp_Object absname, encoded_absname;
Lisp_Object handler;
absname = Fexpand_file_name (filename, BVAR (current_buffer, directory));
CHECK_NUMBER (mode);
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qset_file_modes);
if (!NILP (handler))
return call3 (handler, Qset_file_modes, absname, mode);
encoded_absname = ENCODE_FILE (absname);
if (chmod (SSDATA (encoded_absname), XINT (mode) & 07777) < 0)
report_file_error ("Doing chmod", absname);
return Qnil;
}
DEFUN ("set-default-file-modes", Fset_default_file_modes, Sset_default_file_modes, 1, 1, 0,
doc: /* Set the file permission bits for newly created files.
The argument MODE should be an integer; only the low 9 bits are used.
This setting is inherited by subprocesses. */)
(Lisp_Object mode)
{
mode_t oldrealmask, oldumask, newumask;
CHECK_NUMBER (mode);
oldrealmask = realmask;
newumask = ~ XINT (mode) & 0777;
block_input ();
realmask = newumask;
oldumask = umask (newumask);
unblock_input ();
eassert (oldumask == oldrealmask);
return Qnil;
}
DEFUN ("default-file-modes", Fdefault_file_modes, Sdefault_file_modes, 0, 0, 0,
doc: /* Return the default file protection for created files.
The value is an integer. */)
(void)
{
Lisp_Object value;
XSETINT (value, (~ realmask) & 0777);
return value;
}
DEFUN ("set-file-times", Fset_file_times, Sset_file_times, 1, 2, 0,
doc: /* Set times of file FILENAME to TIMESTAMP.
Set both access and modification times.
Return t on success, else nil.
Use the current time if TIMESTAMP is nil. TIMESTAMP is in the format of
`current-time'. */)
(Lisp_Object filename, Lisp_Object timestamp)
{
Lisp_Object absname, encoded_absname;
Lisp_Object handler;
struct timespec t = lisp_time_argument (timestamp);
absname = Fexpand_file_name (filename, BVAR (current_buffer, directory));
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname, Qset_file_times);
if (!NILP (handler))
return call3 (handler, Qset_file_times, absname, timestamp);
encoded_absname = ENCODE_FILE (absname);
{
if (set_file_times (-1, SSDATA (encoded_absname), t, t) != 0)
{
#ifdef MSDOS
/* Setting times on a directory always fails. */
if (file_directory_p (SSDATA (encoded_absname)))
return Qnil;
#endif
report_file_error ("Setting file times", absname);
}
}
return Qt;
}
#ifdef HAVE_SYNC
DEFUN ("unix-sync", Funix_sync, Sunix_sync, 0, 0, "",
doc: /* Tell Unix to finish all pending disk updates. */)
(void)
{
sync ();
return Qnil;
}
#endif /* HAVE_SYNC */
DEFUN ("file-newer-than-file-p", Ffile_newer_than_file_p, Sfile_newer_than_file_p, 2, 2, 0,
doc: /* Return t if file FILE1 is newer than file FILE2.
If FILE1 does not exist, the answer is nil;
otherwise, if FILE2 does not exist, the answer is t. */)
(Lisp_Object file1, Lisp_Object file2)
{
Lisp_Object absname1, absname2;
struct stat st1, st2;
Lisp_Object handler;
struct gcpro gcpro1, gcpro2;
CHECK_STRING (file1);
CHECK_STRING (file2);
absname1 = Qnil;
GCPRO2 (absname1, file2);
absname1 = expand_and_dir_to_file (file1, BVAR (current_buffer, directory));
absname2 = expand_and_dir_to_file (file2, BVAR (current_buffer, directory));
UNGCPRO;
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (absname1, Qfile_newer_than_file_p);
if (NILP (handler))
handler = Ffind_file_name_handler (absname2, Qfile_newer_than_file_p);
if (!NILP (handler))
return call3 (handler, Qfile_newer_than_file_p, absname1, absname2);
GCPRO2 (absname1, absname2);
absname1 = ENCODE_FILE (absname1);
absname2 = ENCODE_FILE (absname2);
UNGCPRO;
if (stat (SSDATA (absname1), &st1) < 0)
return Qnil;
if (stat (SSDATA (absname2), &st2) < 0)
return Qt;
return (timespec_cmp (get_stat_mtime (&st2), get_stat_mtime (&st1)) < 0
? Qt : Qnil);
}
#ifndef READ_BUF_SIZE
#define READ_BUF_SIZE (64 << 10)
#endif
/* Some buffer offsets are stored in 'int' variables. */
verify (READ_BUF_SIZE <= INT_MAX);
/* This function is called after Lisp functions to decide a coding
system are called, or when they cause an error. Before they are
called, the current buffer is set unibyte and it contains only a
newly inserted text (thus the buffer was empty before the
insertion).
The functions may set markers, overlays, text properties, or even
alter the buffer contents, change the current buffer.
Here, we reset all those changes by:
o set back the current buffer.
o move all markers and overlays to BEG.
o remove all text properties.
o set back the buffer multibyteness. */
static void
decide_coding_unwind (Lisp_Object unwind_data)
{
Lisp_Object multibyte, undo_list, buffer;
multibyte = XCAR (unwind_data);
unwind_data = XCDR (unwind_data);
undo_list = XCAR (unwind_data);
buffer = XCDR (unwind_data);
set_buffer_internal (XBUFFER (buffer));
adjust_markers_for_delete (BEG, BEG_BYTE, Z, Z_BYTE);
adjust_overlays_for_delete (BEG, Z - BEG);
set_buffer_intervals (current_buffer, NULL);
TEMP_SET_PT_BOTH (BEG, BEG_BYTE);
/* Now we are safe to change the buffer's multibyteness directly. */
bset_enable_multibyte_characters (current_buffer, multibyte);
bset_undo_list (current_buffer, undo_list);
}
/* Read from a non-regular file. STATE is a Lisp_Save_Value
object where slot 0 is the file descriptor, slot 1 specifies
an offset to put the read bytes, and slot 2 is the maximum
amount of bytes to read. Value is the number of bytes read. */
static Lisp_Object
read_non_regular (Lisp_Object state)
{
int nbytes;
immediate_quit = 1;
QUIT;
nbytes = emacs_read (XSAVE_INTEGER (state, 0),
((char *) BEG_ADDR + PT_BYTE - BEG_BYTE
+ XSAVE_INTEGER (state, 1)),
XSAVE_INTEGER (state, 2));
immediate_quit = 0;
/* Fast recycle this object for the likely next call. */
free_misc (state);
return make_number (nbytes);
}
/* Condition-case handler used when reading from non-regular files
in insert-file-contents. */
static Lisp_Object
read_non_regular_quit (Lisp_Object ignore)
{
return Qnil;
}
/* Return the file offset that VAL represents, checking for type
errors and overflow. */
static off_t
file_offset (Lisp_Object val)
{
if (RANGED_INTEGERP (0, val, TYPE_MAXIMUM (off_t)))
return XINT (val);
if (FLOATP (val))
{
double v = XFLOAT_DATA (val);
if (0 <= v
&& (sizeof (off_t) < sizeof v
? v <= TYPE_MAXIMUM (off_t)
: v < TYPE_MAXIMUM (off_t)))
return v;
}
wrong_type_argument (intern ("file-offset"), val);
}
/* Return a special time value indicating the error number ERRNUM. */
static struct timespec
time_error_value (int errnum)
{
int ns = (errnum == ENOENT || errnum == EACCES || errnum == ENOTDIR
? NONEXISTENT_MODTIME_NSECS
: UNKNOWN_MODTIME_NSECS);
return make_timespec (0, ns);
}
DEFUN ("insert-file-contents", Finsert_file_contents, Sinsert_file_contents,
1, 5, 0,
doc: /* Insert contents of file FILENAME after point.
Returns list of absolute file name and number of characters inserted.
If second argument VISIT is non-nil, the buffer's visited filename and
last save file modtime are set, and it is marked unmodified. If
visiting and the file does not exist, visiting is completed before the
error is signaled.
The optional third and fourth arguments BEG and END specify what portion
of the file to insert. These arguments count bytes in the file, not
characters in the buffer. If VISIT is non-nil, BEG and END must be nil.
If optional fifth argument REPLACE is non-nil, replace the current
buffer contents (in the accessible portion) with the file contents.
This is better than simply deleting and inserting the whole thing
because (1) it preserves some marker positions and (2) it puts less data
in the undo list. When REPLACE is non-nil, the second return value is
the number of characters that replace previous buffer contents.
This function does code conversion according to the value of
`coding-system-for-read' or `file-coding-system-alist', and sets the
variable `last-coding-system-used' to the coding system actually used.
In addition, this function decodes the inserted text from known formats
by calling `format-decode', which see. */)
(Lisp_Object filename, Lisp_Object visit, Lisp_Object beg, Lisp_Object end, Lisp_Object replace)
{
struct stat st;
struct timespec mtime;
int fd;
ptrdiff_t inserted = 0;
ptrdiff_t how_much;
off_t beg_offset, end_offset;
int unprocessed;
ptrdiff_t count = SPECPDL_INDEX ();
struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5;
Lisp_Object handler, val, insval, orig_filename, old_undo;
Lisp_Object p;
ptrdiff_t total = 0;
bool not_regular = 0;
int save_errno = 0;
char read_buf[READ_BUF_SIZE];
struct coding_system coding;
bool replace_handled = 0;
bool set_coding_system = 0;
Lisp_Object coding_system;
bool read_quit = 0;
/* If the undo log only contains the insertion, there's no point
keeping it. It's typically when we first fill a file-buffer. */
bool empty_undo_list_p
= (!NILP (visit) && NILP (BVAR (current_buffer, undo_list))
&& BEG == Z);
Lisp_Object old_Vdeactivate_mark = Vdeactivate_mark;
bool we_locked_file = 0;
ptrdiff_t fd_index;
if (current_buffer->base_buffer && ! NILP (visit))
error ("Cannot do file visiting in an indirect buffer");
if (!NILP (BVAR (current_buffer, read_only)))
Fbarf_if_buffer_read_only ();
val = Qnil;
p = Qnil;
orig_filename = Qnil;
old_undo = Qnil;
GCPRO5 (filename, val, p, orig_filename, old_undo);
CHECK_STRING (filename);
filename = Fexpand_file_name (filename, Qnil);
/* The value Qnil means that the coding system is not yet
decided. */
coding_system = Qnil;
/* If the file name has special constructs in it,
call the corresponding file handler. */
handler = Ffind_file_name_handler (filename, Qinsert_file_contents);
if (!NILP (handler))
{
val = call6 (handler, Qinsert_file_contents, filename,
visit, beg, end, replace);
if (CONSP (val) && CONSP (XCDR (val))
&& RANGED_INTEGERP (0, XCAR (XCDR (val)), ZV - PT))
inserted = XINT (XCAR (XCDR (val)));
goto handled;
}
orig_filename = filename;
filename = ENCODE_FILE (filename);
fd = emacs_open (SSDATA (filename), O_RDONLY, 0);
if (fd < 0)
{
save_errno = errno;
if (NILP (visit))
report_file_error ("Opening input file", orig_filename);
mtime = time_error_value (save_errno);
st.st_size = -1;
if (!NILP (Vcoding_system_for_read))
Fset (Qbuffer_file_coding_system, Vcoding_system_for_read);
goto notfound;
}
fd_index = SPECPDL_INDEX ();
record_unwind_protect_int (close_file_unwind, fd);
/* Replacement should preserve point as it preserves markers. */
if (!NILP (replace))
record_unwind_protect (restore_point_unwind, Fpoint_marker ());
if (fstat (fd, &st) != 0)
report_file_error ("Input file status", orig_filename);
mtime = get_stat_mtime (&st);
/* This code will need to be changed in order to work on named
pipes, and it's probably just not worth it. So we should at
least signal an error. */
if (!S_ISREG (st.st_mode))
{
not_regular = 1;
if (! NILP (visit))
goto notfound;
if (! NILP (replace) || ! NILP (beg) || ! NILP (end))
xsignal2 (Qfile_error,
build_string ("not a regular file"), orig_filename);
}
if (!NILP (visit))
{
if (!NILP (beg) || !NILP (end))
error ("Attempt to visit less than an entire file");
if (BEG < Z && NILP (replace))
error ("Cannot do file visiting in a non-empty buffer");
}
if (!NILP (beg))
beg_offset = file_offset (beg);
else
beg_offset = 0;
if (!NILP (end))
end_offset = file_offset (end);
else
{
if (not_regular)
end_offset = TYPE_MAXIMUM (off_t);
else
{
end_offset = st.st_size;
/* A negative size can happen on a platform that allows file
sizes greater than the maximum off_t value. */
if (end_offset < 0)
buffer_overflow ();
/* The file size returned from stat may be zero, but data
may be readable nonetheless, for example when this is a
file in the /proc filesystem. */
if (end_offset == 0)
end_offset = READ_BUF_SIZE;
}
}
/* Check now whether the buffer will become too large,
in the likely case where the file's length is not changing.
This saves a lot of needless work before a buffer overflow. */
if (! not_regular)
{
/* The likely offset where we will stop reading. We could read
more (or less), if the file grows (or shrinks) as we read it. */
off_t likely_end = min (end_offset, st.st_size);
if (beg_offset < likely_end)
{
ptrdiff_t buf_bytes
= Z_BYTE - (!NILP (replace) ? ZV_BYTE - BEGV_BYTE : 0);
ptrdiff_t buf_growth_max = BUF_BYTES_MAX - buf_bytes;
off_t likely_growth = likely_end - beg_offset;
if (buf_growth_max < likely_growth)
buffer_overflow ();
}
}
/* Prevent redisplay optimizations. */
current_buffer->clip_changed = 1;
if (EQ (Vcoding_system_for_read, Qauto_save_coding))
{
coding_system = coding_inherit_eol_type (Qutf_8_emacs, Qunix);
setup_coding_system (coding_system, &coding);
/* Ensure we set Vlast_coding_system_used. */
set_coding_system = 1;
}
else if (BEG < Z)
{
/* Decide the coding system to use for reading the file now
because we can't use an optimized method for handling
`coding:' tag if the current buffer is not empty. */
if (!NILP (Vcoding_system_for_read))
coding_system = Vcoding_system_for_read;
else
{
/* Don't try looking inside a file for a coding system
specification if it is not seekable. */
if (! not_regular && ! NILP (Vset_auto_coding_function))
{
/* Find a coding system specified in the heading two
lines or in the tailing several lines of the file.
We assume that the 1K-byte and 3K-byte for heading
and tailing respectively are sufficient for this
purpose. */
int nread;
if (st.st_size <= (1024 * 4))
nread = emacs_read (fd, read_buf, 1024 * 4);
else
{
nread = emacs_read (fd, read_buf, 1024);
if (nread == 1024)
{
int ntail;
if (lseek (fd, - (1024 * 3), SEEK_END) < 0)
report_file_error ("Setting file position",
orig_filename);
ntail = emacs_read (fd, read_buf + nread, 1024 * 3);
nread = ntail < 0 ? ntail : nread + ntail;
}
}
if (nread < 0)
report_file_error ("Read error", orig_filename);
else if (nread > 0)
{
struct buffer *prev = current_buffer;
Lisp_Object workbuf;
struct buffer *buf;
record_unwind_current_buffer ();
workbuf = Fget_buffer_create (build_string (" *code-converting-work*"));
buf = XBUFFER (workbuf);
delete_all_overlays (buf);
bset_directory (buf, BVAR (current_buffer, directory));
bset_read_only (buf, Qnil);
bset_filename (buf, Qnil);
bset_undo_list (buf, Qt);
eassert (buf->overlays_before == NULL);
eassert (buf->overlays_after == NULL);
set_buffer_internal (buf);
Ferase_buffer ();
bset_enable_multibyte_characters (buf, Qnil);
insert_1_both ((char *) read_buf, nread, nread, 0, 0, 0);
TEMP_SET_PT_BOTH (BEG, BEG_BYTE);
coding_system = call2 (Vset_auto_coding_function,
filename, make_number (nread));
set_buffer_internal (prev);
/* Discard the unwind protect for recovering the
current buffer. */
specpdl_ptr--;
/* Rewind the file for the actual read done later. */
if (lseek (fd, 0, SEEK_SET) < 0)
report_file_error ("Setting file position", orig_filename);
}
}
if (NILP (coding_system))
{
/* If we have not yet decided a coding system, check
file-coding-system-alist. */
Lisp_Object args[6];
args[0] = Qinsert_file_contents, args[1] = orig_filename;
args[2] = visit, args[3] = beg, args[4] = end, args[5] = replace;
coding_system = Ffind_operation_coding_system (6, args);
if (CONSP (coding_system))
coding_system = XCAR (coding_system);
}
}
if (NILP (coding_system))
coding_system = Qundecided;
else
CHECK_CODING_SYSTEM (coding_system);
if (NILP (BVAR (current_buffer, enable_multibyte_characters)))
/* We must suppress all character code conversion except for
end-of-line conversion. */
coding_system = raw_text_coding_system (coding_system);
setup_coding_system (coding_system, &coding);
/* Ensure we set Vlast_coding_system_used. */
set_coding_system = 1;
}
/* If requested, replace the accessible part of the buffer
with the file contents. Avoid replacing text at the
beginning or end of the buffer that matches the file contents;
that preserves markers pointing to the unchanged parts.
Here we implement this feature in an optimized way
for the case where code conversion is NOT needed.
The following if-statement handles the case of conversion
in a less optimal way.
If the code conversion is "automatic" then we try using this
method and hope for the best.
But if we discover the need for conversion, we give up on this method
and let the following if-statement handle the replace job. */
if (!NILP (replace)
&& BEGV < ZV
&& (NILP (coding_system)
|| ! CODING_REQUIRE_DECODING (&coding)))
{
/* same_at_start and same_at_end count bytes,
because file access counts bytes
and BEG and END count bytes. */
ptrdiff_t same_at_start = BEGV_BYTE;
ptrdiff_t same_at_end = ZV_BYTE;
ptrdiff_t overlap;
/* There is still a possibility we will find the need to do code
conversion. If that happens, set this variable to
give up on handling REPLACE in the optimized way. */
bool giveup_match_end = 0;
if (beg_offset != 0)
{
if (lseek (fd, beg_offset, SEEK_SET) < 0)
report_file_error ("Setting file position", orig_filename);
}
immediate_quit = 1;
QUIT;
/* Count how many chars at the start of the file
match the text at the beginning of the buffer. */
while (1)
{
int nread, bufpos;
nread = emacs_read (fd, read_buf, sizeof read_buf);
if (nread < 0)
report_file_error ("Read error", orig_filename);
else if (nread == 0)
break;
if (CODING_REQUIRE_DETECTION (&coding))
{
coding_system = detect_coding_system ((unsigned char *) read_buf,
nread, nread, 1, 0,
coding_system);
setup_coding_system (coding_system, &coding);
}
if (CODING_REQUIRE_DECODING (&coding))
/* We found that the file should be decoded somehow.
Let's give up here. */
{
giveup_match_end = 1;
break;
}
bufpos = 0;
while (bufpos < nread && same_at_start < ZV_BYTE
&& FETCH_BYTE (same_at_start) == read_buf[bufpos])
same_at_start++, bufpos++;
/* If we found a discrepancy, stop the scan.
Otherwise loop around and scan the next bufferful. */
if (bufpos != nread)
break;
}
immediate_quit = 0;
/* If the file matches the buffer completely,
there's no need to replace anything. */
if (same_at_start - BEGV_BYTE == end_offset - beg_offset)
{
emacs_close (fd);
clear_unwind_protect (fd_index);
/* Truncate the buffer to the size of the file. */
del_range_1 (same_at_start, same_at_end, 0, 0);
goto handled;
}
immediate_quit = 1;
QUIT;
/* Count how many chars at the end of the file
match the text at the end of the buffer. But, if we have
already found that decoding is necessary, don't waste time. */
while (!giveup_match_end)
{
int total_read, nread, bufpos, trial;
off_t curpos;
/* At what file position are we now scanning? */
curpos = end_offset - (ZV_BYTE - same_at_end);
/* If the entire file matches the buffer tail, stop the scan. */
if (curpos == 0)
break;
/* How much can we scan in the next step? */
trial = min (curpos, sizeof read_buf);
if (lseek (fd, curpos - trial, SEEK_SET) < 0)
report_file_error ("Setting file position", orig_filename);
total_read = nread = 0;
while (total_read < trial)
{
nread = emacs_read (fd, read_buf + total_read, trial - total_read);
if (nread < 0)
report_file_error ("Read error", orig_filename);
else if (nread == 0)
break;
total_read += nread;
}
/* Scan this bufferful from the end, comparing with
the Emacs buffer. */
bufpos = total_read;
/* Compare with same_at_start to avoid counting some buffer text
as matching both at the file's beginning and at the end. */
while (bufpos > 0 && same_at_end > same_at_start
&& FETCH_BYTE (same_at_end - 1) == read_buf[bufpos - 1])
same_at_end--, bufpos--;
/* If we found a discrepancy, stop the scan.
Otherwise loop around and scan the preceding bufferful. */
if (bufpos != 0)
{
/* If this discrepancy is because of code conversion,
we cannot use this method; giveup and try the other. */
if (same_at_end > same_at_start
&& FETCH_BYTE (same_at_end - 1) >= 0200
&& ! NILP (BVAR (current_buffer, enable_multibyte_characters))
&& (CODING_MAY_REQUIRE_DECODING (&coding)))
giveup_match_end = 1;
break;
}
if (nread == 0)
break;
}
immediate_quit = 0;
if (! giveup_match_end)
{
ptrdiff_t temp;
/* We win! We can handle REPLACE the optimized way. */
/* Extend the start of non-matching text area to multibyte
character boundary. */
if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
while (same_at_start > BEGV_BYTE
&& ! CHAR_HEAD_P (FETCH_BYTE (same_at_start)))
same_at_start--;
/* Extend the end of non-matching text area to multibyte
character boundary. */
if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
while (same_at_end < ZV_BYTE
&& ! CHAR_HEAD_P (FETCH_BYTE (same_at_end)))
same_at_end++;
/* Don't try to reuse the same piece of text twice. */
overlap = (same_at_start - BEGV_BYTE
- (same_at_end
+ (! NILP (end) ? end_offset : st.st_size) - ZV_BYTE));
if (overlap > 0)
same_at_end += overlap;
/* Arrange to read only the nonmatching middle part of the file. */
beg_offset += same_at_start - BEGV_BYTE;
end_offset -= ZV_BYTE - same_at_end;
invalidate_buffer_caches (current_buffer,
BYTE_TO_CHAR (same_at_start),
BYTE_TO_CHAR (same_at_end));
del_range_byte (same_at_start, same_at_end, 0);
/* Insert from the file at the proper position. */
temp = BYTE_TO_CHAR (same_at_start);
SET_PT_BOTH (temp, same_at_start);
/* If display currently starts at beginning of line,
keep it that way. */
if (XBUFFER (XWINDOW (selected_window)->contents) == current_buffer)
XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ());
replace_handled = 1;
}
}
/* If requested, replace the accessible part of the buffer
with the file contents. Avoid replacing text at the
beginning or end of the buffer that matches the file contents;
that preserves markers pointing to the unchanged parts.
Here we implement this feature for the case where code conversion
is needed, in a simple way that needs a lot of memory.
The preceding if-statement handles the case of no conversion
in a more optimized way. */
if (!NILP (replace) && ! replace_handled && BEGV < ZV)
{
ptrdiff_t same_at_start = BEGV_BYTE;
ptrdiff_t same_at_end = ZV_BYTE;
ptrdiff_t same_at_start_charpos;
ptrdiff_t inserted_chars;
ptrdiff_t overlap;
ptrdiff_t bufpos;
unsigned char *decoded;
ptrdiff_t temp;
ptrdiff_t this = 0;
ptrdiff_t this_count = SPECPDL_INDEX ();
bool multibyte
= ! NILP (BVAR (current_buffer, enable_multibyte_characters));
Lisp_Object conversion_buffer;
struct gcpro gcpro1;
conversion_buffer = code_conversion_save (1, multibyte);
/* First read the whole file, performing code conversion into
CONVERSION_BUFFER. */
if (lseek (fd, beg_offset, SEEK_SET) < 0)
report_file_error ("Setting file position", orig_filename);
inserted = 0; /* Bytes put into CONVERSION_BUFFER so far. */
unprocessed = 0; /* Bytes not processed in previous loop. */
GCPRO1 (conversion_buffer);
while (1)
{
/* Read at most READ_BUF_SIZE bytes at a time, to allow
quitting while reading a huge file. */
/* Allow quitting out of the actual I/O. */
immediate_quit = 1;
QUIT;
this = emacs_read (fd, read_buf + unprocessed,
READ_BUF_SIZE - unprocessed);
immediate_quit = 0;
if (this <= 0)
break;
BUF_TEMP_SET_PT (XBUFFER (conversion_buffer),
BUF_Z (XBUFFER (conversion_buffer)));
decode_coding_c_string (&coding, (unsigned char *) read_buf,
unprocessed + this, conversion_buffer);
unprocessed = coding.carryover_bytes;
if (coding.carryover_bytes > 0)
memcpy (read_buf, coding.carryover, unprocessed);
}
UNGCPRO;
if (this < 0)
report_file_error ("Read error", orig_filename);
emacs_close (fd);
clear_unwind_protect (fd_index);
if (unprocessed > 0)
{
coding.mode |= CODING_MODE_LAST_BLOCK;
decode_coding_c_string (&coding, (unsigned char *) read_buf,
unprocessed, conversion_buffer);
coding.mode &= ~CODING_MODE_LAST_BLOCK;
}
coding_system = CODING_ID_NAME (coding.id);
set_coding_system = 1;
decoded = BUF_BEG_ADDR (XBUFFER (conversion_buffer));
inserted = (BUF_Z_BYTE (XBUFFER (conversion_buffer))
- BUF_BEG_BYTE (XBUFFER (conversion_buffer)));
/* Compare the beginning of the converted string with the buffer
text. */
bufpos = 0;
while (bufpos < inserted && same_at_start < same_at_end
&& FETCH_BYTE (same_at_start) == decoded[bufpos])
same_at_start++, bufpos++;
/* If the file matches the head of buffer completely,
there's no need to replace anything. */
if (bufpos == inserted)
{
/* Truncate the buffer to the size of the file. */
if (same_at_start != same_at_end)
{
invalidate_buffer_caches (current_buffer,
BYTE_TO_CHAR (same_at_start),
BYTE_TO_CHAR (same_at_end));
del_range_byte (same_at_start, same_at_end, 0);
}
inserted = 0;
unbind_to (this_count, Qnil);
goto handled;
}
/* Extend the start of non-matching text area to the previous
multibyte character boundary. */
if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
while (same_at_start > BEGV_BYTE
&& ! CHAR_HEAD_P (FETCH_BYTE (same_at_start)))
same_at_start--;
/* Scan this bufferful from the end, comparing with
the Emacs buffer. */
bufpos = inserted;
/* Compare with same_at_start to avoid counting some buffer text
as matching both at the file's beginning and at the end. */
while (bufpos > 0 && same_at_end > same_at_start
&& FETCH_BYTE (same_at_end - 1) == decoded[bufpos - 1])
same_at_end--, bufpos--;
/* Extend the end of non-matching text area to the next
multibyte character boundary. */
if (! NILP (BVAR (current_buffer, enable_multibyte_characters)))
while (same_at_end < ZV_BYTE
&& ! CHAR_HEAD_P (FETCH_BYTE (same_at_end)))
same_at_end++;
/* Don't try to reuse the same piece of text twice. */
overlap = same_at_start - BEGV_BYTE - (same_at_end + inserted - ZV_BYTE);
if (overlap > 0)
same_at_end += overlap;
/* If display currently starts at beginning of line,
keep it that way. */
if (XBUFFER (XWINDOW (selected_window)->contents) == current_buffer)
XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ());
/* Replace the chars that we need to replace,
and update INSERTED to equal the number of bytes
we are taking from the decoded string. */
inserted -= (ZV_BYTE - same_at_end) + (same_at_start - BEGV_BYTE);
if (same_at_end != same_at_start)
{
invalidate_buffer_caches (current_buffer,
BYTE_TO_CHAR (same_at_start),
BYTE_TO_CHAR (same_at_end));
del_range_byte (same_at_start, same_at_end, 0);
temp = GPT;
eassert (same_at_start == GPT_BYTE);
same_at_start = GPT_BYTE;
}
else
{
temp = BYTE_TO_CHAR (same_at_start);
}
/* Insert from the file at the proper position. */
SET_PT_BOTH (temp, same_at_start);
same_at_start_charpos
= buf_bytepos_to_charpos (XBUFFER (conversion_buffer),
same_at_start - BEGV_BYTE
+ BUF_BEG_BYTE (XBUFFER (conversion_buffer)));
eassert (same_at_start_charpos == temp - (BEGV - BEG));
inserted_chars
= (buf_bytepos_to_charpos (XBUFFER (conversion_buffer),
same_at_start + inserted - BEGV_BYTE
+ BUF_BEG_BYTE (XBUFFER (conversion_buffer)))
- same_at_start_charpos);
/* This binding is to avoid ask-user-about-supersession-threat
being called in insert_from_buffer (via in
prepare_to_modify_buffer). */
specbind (intern ("buffer-file-name"), Qnil);
insert_from_buffer (XBUFFER (conversion_buffer),
same_at_start_charpos, inserted_chars, 0);
/* Set `inserted' to the number of inserted characters. */
inserted = PT - temp;
/* Set point before the inserted characters. */
SET_PT_BOTH (temp, same_at_start);
unbind_to (this_count, Qnil);
goto handled;
}
if (! not_regular)
total = end_offset - beg_offset;
else
/* For a special file, all we can do is guess. */
total = READ_BUF_SIZE;
if (NILP (visit) && total > 0)
{
#ifdef CLASH_DETECTION
if (!NILP (BVAR (current_buffer, file_truename))
/* Make binding buffer-file-name to nil effective. */
&& !NILP (BVAR (current_buffer, filename))
&& SAVE_MODIFF >= MODIFF)
we_locked_file = 1;
#endif /* CLASH_DETECTION */
prepare_to_modify_buffer (PT, PT, NULL);
}
move_gap_both (PT, PT_BYTE);
if (GAP_SIZE < total)
make_gap (total - GAP_SIZE);