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dir.c
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dir.c
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/**********************************************************************
dir.c -
$Author$
$Date$
created at: Wed Jan 5 09:51:01 JST 1994
Copyright (C) 1993-2003 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined HAVE_DIRENT_H && !defined _WIN32
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#elif defined HAVE_DIRECT_H && !defined _WIN32
# include <direct.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# if !defined __NeXT__
# define NAMLEN(dirent) (dirent)->d_namlen
# else
# /* On some versions of NextStep, d_namlen is always zero, so avoid it. */
# define NAMLEN(dirent) strlen((dirent)->d_name)
# endif
# if HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# if HAVE_NDIR_H
# include <ndir.h>
# endif
# ifdef _WIN32
# include "win32/dir.h"
# endif
#endif
#include <errno.h>
#ifndef HAVE_STDLIB_H
char *getenv();
#endif
#ifndef HAVE_STRING_H
char *strchr _((char*,char));
#endif
#include <ctype.h>
#include "util.h"
#ifndef HAVE_LSTAT
#define lstat(path,st) stat(path,st)
#endif
#define FNM_NOESCAPE 0x01
#define FNM_PATHNAME 0x02
#define FNM_DOTMATCH 0x04
#define FNM_CASEFOLD 0x08
#define FNM_NOMATCH 1
#define FNM_ERROR 2
#define downcase(c) (nocase && ISUPPER(c) ? tolower(c) : (c))
#ifndef CharNext /* defined as CharNext[AW] on Windows. */
# if defined(DJGPP)
# define CharNext(p) ((p) + mblen(p, MB_CUR_MAX))
# else
# define CharNext(p) ((p) + 1)
# endif
#endif
#if defined DOSISH
#define isdirsep(c) ((c) == '/' || (c) == '\\')
#else
#define isdirsep(c) ((c) == '/')
#endif
static char *
range(pat, test, flags)
const char *pat;
int test;
int flags;
{
int not, ok = 0;
int nocase = flags & FNM_CASEFOLD;
int escape = !(flags & FNM_NOESCAPE);
not = *pat == '!' || *pat == '^';
if (not)
pat++;
test = downcase(test);
while (*pat != ']') {
int cstart, cend;
if (escape && *pat == '\\')
pat++;
cstart = cend = *pat++;
if (!cstart)
return NULL;
if (*pat == '-' && pat[1] != ']') {
pat++;
if (escape && *pat == '\\')
pat++;
cend = *pat++;
if (!cend)
return NULL;
}
if (downcase(cstart) <= test && test <= downcase(cend))
ok = 1;
}
return ok == not ? NULL : (char *)pat + 1;
}
#define ISDIRSEP(c) (pathname && isdirsep(c))
#define PERIOD(s) (period && *(s) == '.' && \
((s) == string || ISDIRSEP((s)[-1])))
static int
fnmatch(pat, string, flags)
const char *pat;
const char *string;
int flags;
{
int c;
int test;
const char *s = string;
int escape = !(flags & FNM_NOESCAPE);
int pathname = flags & FNM_PATHNAME;
int period = !(flags & FNM_DOTMATCH);
int nocase = flags & FNM_CASEFOLD;
while (c = *pat++) {
switch (c) {
case '?':
if (!*s || ISDIRSEP(*s) || PERIOD(s))
return FNM_NOMATCH;
s++;
break;
case '*':
while ((c = *pat++) == '*')
;
if (PERIOD(s))
return FNM_NOMATCH;
if (!c) {
if (pathname && *rb_path_next(s))
return FNM_NOMATCH;
else
return 0;
}
else if (ISDIRSEP(c)) {
s = rb_path_next(s);
if (*s) {
s++;
break;
}
return FNM_NOMATCH;
}
test = escape && c == '\\' ? *pat : c;
test = downcase(test);
pat--;
while (*s) {
if ((c == '?' || c == '[' || downcase(*s) == test) &&
!fnmatch(pat, s, flags | FNM_DOTMATCH))
return 0;
else if (ISDIRSEP(*s))
break;
s++;
}
return FNM_NOMATCH;
case '[':
if (!*s || ISDIRSEP(*s) || PERIOD(s))
return FNM_NOMATCH;
pat = range(pat, *s, flags);
if (pat == NULL)
return FNM_NOMATCH;
s++;
break;
case '\\':
if (escape
#if defined DOSISH
&& *pat && strchr("*?[]\\", *pat)
#endif
) {
c = *pat;
if (!c)
c = '\\';
else
pat++;
}
/* FALLTHROUGH */
default:
#if defined DOSISH
if (ISDIRSEP(c) && isdirsep(*s))
;
else
#endif
if(downcase(c) != downcase(*s))
return FNM_NOMATCH;
s++;
break;
}
}
return !*s ? 0 : FNM_NOMATCH;
}
VALUE rb_cDir;
struct dir_data {
DIR *dir;
char *path;
};
static void
free_dir(dir)
struct dir_data *dir;
{
if (dir) {
if (dir->dir) closedir(dir->dir);
if (dir->path) free(dir->path);
}
free(dir);
}
static VALUE dir_close _((VALUE));
static VALUE dir_s_alloc _((VALUE));
static VALUE
dir_s_alloc(klass)
VALUE klass;
{
struct dir_data *dirp;
VALUE obj = Data_Make_Struct(klass, struct dir_data, 0, free_dir, dirp);
dirp->dir = NULL;
dirp->path = NULL;
return obj;
}
/*
* call-seq:
* Dir.new( string ) -> aDir
*
* Returns a new directory object for the named directory.
*/
static VALUE
dir_initialize(dir, dirname)
VALUE dir, dirname;
{
struct dir_data *dp;
SafeStringValue(dirname);
Data_Get_Struct(dir, struct dir_data, dp);
if (dp->dir) closedir(dp->dir);
if (dp->path) free(dp->path);
dp->dir = NULL;
dp->path = NULL;
dp->dir = opendir(RSTRING(dirname)->ptr);
if (dp->dir == NULL) {
if (errno == EMFILE || errno == ENFILE) {
rb_gc();
dp->dir = opendir(RSTRING(dirname)->ptr);
}
if (dp->dir == NULL) {
rb_sys_fail(RSTRING(dirname)->ptr);
}
}
dp->path = strdup(RSTRING(dirname)->ptr);
return dir;
}
/*
* call-seq:
* Dir.open( string ) => aDir
* Dir.open( string ) {| aDir | block } => anObject
*
* With no block, <code>open</code> is a synonym for
* <code>Dir::new</code>. If a block is present, it is passed
* <i>aDir</i> as a parameter. The directory is closed at the end of
* the block, and <code>Dir::open</code> returns the value of the
* block.
*/
static VALUE
dir_s_open(klass, dirname)
VALUE klass, dirname;
{
struct dir_data *dp;
VALUE dir = Data_Make_Struct(klass, struct dir_data, 0, free_dir, dp);
dir_initialize(dir, dirname);
if (rb_block_given_p()) {
return rb_ensure(rb_yield, dir, dir_close, dir);
}
return dir;
}
static void
dir_closed()
{
rb_raise(rb_eIOError, "closed directory");
}
#define GetDIR(obj, dirp) do {\
Data_Get_Struct(obj, struct dir_data, dirp);\
if (dirp->dir == NULL) dir_closed();\
} while (0)
/*
* call-seq:
* dir.path => string or nil
*
* Returns the path parameter passed to <em>dir</em>'s constructor.
*
* d = Dir.new("..")
* d.path #=> ".."
*/
static VALUE
dir_path(dir)
VALUE dir;
{
struct dir_data *dirp;
GetDIR(dir, dirp);
if (!dirp->path) return Qnil;
return rb_str_new2(dirp->path);
}
/*
* call-seq:
* dir.read => string or nil
*
* Reads the next entry from <em>dir</em> and returns it as a string.
* Returns <code>nil</code> at the end of the stream.
*
* d = Dir.new("testdir")
* d.read #=> "."
* d.read #=> ".."
* d.read #=> "config.h"
*/
static VALUE
dir_read(dir)
VALUE dir;
{
struct dir_data *dirp;
struct dirent *dp;
GetDIR(dir, dirp);
errno = 0;
dp = readdir(dirp->dir);
if (dp) {
return rb_tainted_str_new(dp->d_name, NAMLEN(dp));
}
else if (errno == 0) { /* end of stream */
return Qnil;
}
else {
rb_sys_fail(0);
}
return Qnil; /* not reached */
}
/*
* call-seq:
* dir.each { |filename| block } => dir
*
* Calls the block once for each entry in this directory, passing the
* filename of each entry as a parameter to the block.
*
* d = Dir.new("testdir")
* d.each {|x| puts "Got #{x}" }
*
* <em>produces:</em>
*
* Got .
* Got ..
* Got config.h
* Got main.rb
*/
static VALUE
dir_each(dir)
VALUE dir;
{
struct dir_data *dirp;
struct dirent *dp;
GetDIR(dir, dirp);
for (dp = readdir(dirp->dir); dp != NULL; dp = readdir(dirp->dir)) {
rb_yield(rb_tainted_str_new(dp->d_name, NAMLEN(dp)));
if (dirp->dir == NULL) dir_closed();
}
return dir;
}
/*
* call-seq:
* dir.pos => integer
* dir.tell => integer
*
* Returns the current position in <em>dir</em>. See also
* <code>Dir#seek</code>.
*
* d = Dir.new("testdir")
* d.tell #=> 0
* d.read #=> "."
* d.tell #=> 12
*/
static VALUE
dir_tell(dir)
VALUE dir;
{
#ifdef HAVE_TELLDIR
struct dir_data *dirp;
long pos;
GetDIR(dir, dirp);
pos = telldir(dirp->dir);
return rb_int2inum(pos);
#else
rb_notimplement();
#endif
}
/*
* call-seq:
* dir.seek( integer ) => dir
*
* Seeks to a particular location in <em>dir</em>. <i>integer</i>
* must be a value returned by <code>Dir#tell</code>.
*
* d = Dir.new("testdir") #=> #<Dir:0x401b3c40>
* d.read #=> "."
* i = d.tell #=> 12
* d.read #=> ".."
* d.seek(i) #=> #<Dir:0x401b3c40>
* d.read #=> ".."
*/
static VALUE
dir_seek(dir, pos)
VALUE dir, pos;
{
struct dir_data *dirp;
#ifdef HAVE_SEEKDIR
GetDIR(dir, dirp);
seekdir(dirp->dir, NUM2INT(pos));
return dir;
#else
rb_notimplement();
#endif
}
/*
* call-seq:
* dir.pos( integer ) => integer
*
* Synonym for <code>Dir#seek</code>, but returns the position
* parameter.
*
* d = Dir.new("testdir") #=> #<Dir:0x401b3c40>
* d.read #=> "."
* i = d.pos #=> 12
* d.read #=> ".."
* d.pos = i #=> 12
* d.read #=> ".."
*/
static VALUE
dir_set_pos(dir, pos)
VALUE dir, pos;
{
dir_seek(dir, pos);
return pos;
}
/*
* call-seq:
* dir.rewind => dir
*
* Repositions <em>dir</em> to the first entry.
*
* d = Dir.new("testdir")
* d.read #=> "."
* d.rewind #=> #<Dir:0x401b3fb0>
* d.read #=> "."
*/
static VALUE
dir_rewind(dir)
VALUE dir;
{
struct dir_data *dirp;
GetDIR(dir, dirp);
rewinddir(dirp->dir);
return dir;
}
/*
* call-seq:
* dir.close => nil
*
* Closes the directory stream. Any further attempts to access
* <em>dir</em> will raise an <code>IOError</code>.
*
* d = Dir.new("testdir")
* d.close #=> nil
*/
static VALUE
dir_close(dir)
VALUE dir;
{
struct dir_data *dirp;
GetDIR(dir, dirp);
closedir(dirp->dir);
dirp->dir = NULL;
return Qnil;
}
static void
dir_chdir(path)
VALUE path;
{
if (chdir(RSTRING(path)->ptr) < 0)
rb_sys_fail(RSTRING(path)->ptr);
}
static int chdir_blocking = 0;
static VALUE chdir_thread = Qnil;
struct chdir_data {
VALUE old_path, new_path;
int done;
};
static VALUE
chdir_yield(args)
struct chdir_data *args;
{
dir_chdir(args->new_path);
args->done = Qtrue;
chdir_blocking++;
if (chdir_thread == Qnil)
chdir_thread = rb_thread_current();
return rb_yield(args->new_path);
}
static VALUE
chdir_restore(args)
struct chdir_data *args;
{
if (args->done) {
chdir_blocking--;
if (chdir_blocking == 0)
chdir_thread = Qnil;
dir_chdir(args->old_path);
}
return Qnil;
}
/*
* call-seq:
* Dir.chdir( [ string] ) => 0
* Dir.chdir( [ string] ) {| path | block } => anObject
*
* Changes the current working directory of the process to the given
* string. When called without an argument, changes the directory to
* the value of the environment variable <code>HOME</code>, or
* <code>LOGDIR</code>. <code>SystemCallError</code> (probably
* <code>Errno::ENOENT</code>) if the target directory does not exist.
*
* If a block is given, it is passed the name of the new current
* directory, and the block is executed with that as the current
* directory. The original working directory is restored when the block
* exits. The return value of <code>chdir</code> is the value of the
* block. <code>chdir</code> blocks can be nested, but in a
* multi-threaded program an error will be raised if a thread attempts
* to open a <code>chdir</code> block while another thread has one
* open.
*
* Dir.chdir("/var/spool/mail")
* puts Dir.pwd
* Dir.chdir("/tmp") do
* puts Dir.pwd
* Dir.chdir("/usr") do
* puts Dir.pwd
* end
* puts Dir.pwd
* end
* puts Dir.pwd
*
* <em>produces:</em>
*
* /var/spool/mail
* /tmp
* /usr
* /tmp
* /var/spool/mail
*/
static VALUE
dir_s_chdir(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE path = Qnil;
rb_secure(2);
if (rb_scan_args(argc, argv, "01", &path) == 1) {
SafeStringValue(path);
}
else {
const char *dist = getenv("HOME");
if (!dist) {
dist = getenv("LOGDIR");
if (!dist) rb_raise(rb_eArgError, "HOME/LOGDIR not set");
}
path = rb_str_new2(dist);
}
if (chdir_blocking > 0) {
if (!rb_block_given_p() || rb_thread_current() != chdir_thread)
rb_warn("conflicting chdir during another chdir block");
}
if (rb_block_given_p()) {
struct chdir_data args;
char *cwd = my_getcwd();
args.old_path = rb_tainted_str_new2(cwd); free(cwd);
args.new_path = path;
args.done = Qfalse;
return rb_ensure(chdir_yield, (VALUE)&args, chdir_restore, (VALUE)&args);
}
dir_chdir(path);
return INT2FIX(0);
}
/*
* call-seq:
* Dir.getwd => string
* Dir.pwd => string
*
* Returns the path to the current working directory of this process as
* a string.
*
* Dir.chdir("/tmp") #=> 0
* Dir.getwd #=> "/tmp"
*/
static VALUE
dir_s_getwd(dir)
VALUE dir;
{
char *path;
VALUE cwd;
rb_secure(4);
path = my_getcwd();
cwd = rb_tainted_str_new2(path);
free(path);
return cwd;
}
static void check_dirname _((volatile VALUE *));
static void
check_dirname(dir)
volatile VALUE *dir;
{
char *path, *pend;
SafeStringValue(*dir);
rb_secure(2);
path = RSTRING(*dir)->ptr;
if (path && *(pend = rb_path_end(rb_path_skip_prefix(path)))) {
*dir = rb_str_new(path, pend - path);
}
}
/*
* call-seq:
* Dir.chroot( string ) => 0
*
* Changes this process's idea of the file system root. Only a
* privileged process may make this call. Not available on all
* platforms. On Unix systems, see <code>chroot(2)</code> for more
* information.
*/
static VALUE
dir_s_chroot(dir, path)
VALUE dir, path;
{
#if defined(HAVE_CHROOT) && !defined(__CHECKER__)
check_dirname(&path);
if (chroot(RSTRING(path)->ptr) == -1)
rb_sys_fail(RSTRING(path)->ptr);
return INT2FIX(0);
#else
rb_notimplement();
return Qnil; /* not reached */
#endif
}
/*
* call-seq:
* Dir.mkdir( string [, integer] ) => 0
*
* Makes a new directory named by <i>string</i>, with permissions
* specified by the optional parameter <i>anInteger</i>. The
* permissions may be modified by the value of
* <code>File::umask</code>, and are ignored on NT. Raises a
* <code>SystemCallError</code> if the directory cannot be created. See
* also the discussion of permissions in the class documentation for
* <code>File</code>.
*
*/
static VALUE
dir_s_mkdir(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE path, vmode;
int mode;
if (rb_scan_args(argc, argv, "11", &path, &vmode) == 2) {
mode = NUM2INT(vmode);
}
else {
mode = 0777;
}
check_dirname(&path);
#ifndef _WIN32
if (mkdir(RSTRING(path)->ptr, mode) == -1)
rb_sys_fail(RSTRING(path)->ptr);
#else
if (mkdir(RSTRING(path)->ptr) == -1)
rb_sys_fail(RSTRING(path)->ptr);
#endif
return INT2FIX(0);
}
/*
* call-seq:
* Dir.delete( string ) => 0
* Dir.rmdir( string ) => 0
* Dir.unlink( string ) => 0
*
* Deletes the named directory. Raises a subclass of
* <code>SystemCallError</code> if the directory isn't empty.
*/
static VALUE
dir_s_rmdir(obj, dir)
VALUE obj, dir;
{
check_dirname(&dir);
if (rmdir(RSTRING(dir)->ptr) < 0)
rb_sys_fail(RSTRING(dir)->ptr);
return INT2FIX(0);
}
/* Return nonzero if S has any special globbing chars in it. */
static int
has_magic(s, send, flags)
const char *s, *send;
int flags;
{
register const char *p = s;
register char c;
int open = 0;
int escape = !(flags & FNM_NOESCAPE);
while ((c = *p++) != '\0') {
switch (c) {
case '?':
case '*':
return Qtrue;
case '[': /* Only accept an open brace if there is a close */
open++; /* brace to match it. Bracket expressions must be */
continue; /* complete, according to Posix.2 */
case ']':
if (open)
return Qtrue;
continue;
case '\\':
if (escape && *p++ == '\0')
return Qfalse;
}
if (send && p >= send) break;
}
return Qfalse;
}
static char*
extract_path(p, pend)
const char *p, *pend;
{
char *alloc;
int len;
len = pend - p;
alloc = ALLOC_N(char, len+1);
memcpy(alloc, p, len);
if (len > 1 && pend[-1] == '/'
#if defined DOSISH_DRIVE_LETTER
&& pend[-2] != ':'
#endif
) {
alloc[len-1] = 0;
}
else {
alloc[len] = 0;
}
return alloc;
}
static char*
extract_elem(path)
const char *path;
{
const char *pend;
pend = strchr(path, '/');
if (!pend) pend = path + strlen(path);
return extract_path(path, pend);
}
static void
remove_backslashes(p)
char *p;
{
char *pend = p + strlen(p);
char *t = p;
while (p < pend) {
if (*p == '\\') {
if (++p == pend) break;
}
*t++ = *p++;
}
*t = '\0';
}
#ifndef S_ISDIR
# define S_ISDIR(m) ((m & S_IFMT) == S_IFDIR)
#endif
struct glob_args {
void (*func) _((const char*, VALUE));
const char *c;
VALUE v;
};
static VALUE glob_func_caller _((VALUE));
static VALUE
glob_func_caller(val)
VALUE val;
{
struct glob_args *args = (struct glob_args *)val;
(*args->func)(args->c, args->v);
return Qnil;
}
static int
glob_call_func(func, path, arg)
void (*func) _((const char*, VALUE));
const char *path;
VALUE arg;
{
int status;
struct glob_args args;
args.func = func;
args.c = path;
args.v = arg;
rb_protect(glob_func_caller, (VALUE)&args, &status);
return status;
}
static int
glob_helper(path, sub, flags, func, arg)
char *path;
char *sub;
int flags;
void (*func) _((const char*, VALUE));
VALUE arg;
{
struct stat st;
char *p, *m;
int status = 0;
p = sub ? sub : path;
if (!has_magic(p, 0, flags)) {
#if defined DOSISH
remove_backslashes(path);
#else
if (!(flags & FNM_NOESCAPE)) remove_backslashes(p);
#endif
if (lstat(path, &st) == 0) {
status = glob_call_func(func, path, arg);
if (status) return status;
}
else if (errno != ENOENT) {
/* In case stat error is other than ENOENT and
we may want to know what is wrong. */
rb_sys_warning(path);
}
return 0;
}
while (p && !status) {
if (*p == '/') p++;
m = strchr(p, '/');
if (has_magic(p, m, flags)) {
char *dir, *base, *magic, *buf;
DIR *dirp;
struct dirent *dp;
int recursive = 0;
struct d_link {
char *path;
struct d_link *next;
} *tmp, *link, **tail = &link;
base = extract_path(path, p);
if (path == p) dir = ".";
else dir = base;
magic = extract_elem(p);
if (stat(dir, &st) < 0) {
if (errno != ENOENT) rb_sys_warning(dir);
free(base);
free(magic);
break;
}
if (S_ISDIR(st.st_mode)) {
if (m && strcmp(magic, "**") == 0) {
int n = strlen(base);
recursive = 1;
buf = ALLOC_N(char, n+strlen(m)+3);
sprintf(buf, "%s%s", base, *base ? m : m+1);
status = glob_helper(buf, buf+n, flags, func, arg);
free(buf);
if (status) goto finalize;
}
dirp = opendir(dir);
if (dirp == NULL) {
rb_sys_warning(dir);
free(base);
free(magic);
break;
}
}
else {
free(base);
free(magic);
break;
}
#if defined DOSISH_DRIVE_LETTER
#define BASE (*base && !((isdirsep(*base) && !base[1]) || (base[1] == ':' && isdirsep(base[2]) && !base[3])))
#else
#define BASE (*base && !(isdirsep(*base) && !base[1]))
#endif