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print.c
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print.c
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/* Lisp object printing and output streams.
Copyright (C) 1985-1986, 1988, 1993-1995, 1997-2014 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 "sysstdio.h"
#include "lisp.h"
#include "character.h"
#include "buffer.h"
#include "charset.h"
#include "keyboard.h"
#include "frame.h"
#include "window.h"
#include "process.h"
#include "dispextern.h"
#include "termchar.h"
#include "intervals.h"
#include "blockinput.h"
#include "termhooks.h" /* For struct terminal. */
#include "font.h"
Lisp_Object Qstandard_output;
static Lisp_Object Qtemp_buffer_setup_hook;
/* These are used to print like we read. */
static Lisp_Object Qfloat_output_format;
#include <float.h>
#include <ftoastr.h>
/* Avoid actual stack overflow in print. */
static ptrdiff_t print_depth;
/* Level of nesting inside outputting backquote in new style. */
static ptrdiff_t new_backquote_output;
/* Detect most circularities to print finite output. */
#define PRINT_CIRCLE 200
static Lisp_Object being_printed[PRINT_CIRCLE];
/* When printing into a buffer, first we put the text in this
block, then insert it all at once. */
static char *print_buffer;
/* Size allocated in print_buffer. */
static ptrdiff_t print_buffer_size;
/* Chars stored in print_buffer. */
static ptrdiff_t print_buffer_pos;
/* Bytes stored in print_buffer. */
static ptrdiff_t print_buffer_pos_byte;
Lisp_Object Qprint_escape_newlines;
static Lisp_Object Qprint_escape_multibyte, Qprint_escape_nonascii;
/* Vprint_number_table is a table, that keeps objects that are going to
be printed, to allow use of #n= and #n# to express sharing.
For any given object, the table can give the following values:
t the object will be printed only once.
-N the object will be printed several times and will take number N.
N the object has been printed so we can refer to it as #N#.
print_number_index holds the largest N already used.
N has to be striclty larger than 0 since we need to distinguish -N. */
static ptrdiff_t print_number_index;
static void print_interval (INTERVAL interval, Lisp_Object printcharfun);
/* GDB resets this to zero on W32 to disable OutputDebugString calls. */
bool print_output_debug_flag EXTERNALLY_VISIBLE = 1;
/* Low level output routines for characters and strings. */
/* Lisp functions to do output using a stream
must have the stream in a variable called printcharfun
and must start with PRINTPREPARE, end with PRINTFINISH,
and use PRINTDECLARE to declare common variables.
Use PRINTCHAR to output one character,
or call strout to output a block of characters. */
#define PRINTDECLARE \
struct buffer *old = current_buffer; \
ptrdiff_t old_point = -1, start_point = -1; \
ptrdiff_t old_point_byte = -1, start_point_byte = -1; \
ptrdiff_t specpdl_count = SPECPDL_INDEX (); \
bool free_print_buffer = 0; \
bool multibyte \
= !NILP (BVAR (current_buffer, enable_multibyte_characters)); \
Lisp_Object original
#define PRINTPREPARE \
original = printcharfun; \
if (NILP (printcharfun)) printcharfun = Qt; \
if (BUFFERP (printcharfun)) \
{ \
if (XBUFFER (printcharfun) != current_buffer) \
Fset_buffer (printcharfun); \
printcharfun = Qnil; \
} \
if (MARKERP (printcharfun)) \
{ \
ptrdiff_t marker_pos; \
if (! XMARKER (printcharfun)->buffer) \
error ("Marker does not point anywhere"); \
if (XMARKER (printcharfun)->buffer != current_buffer) \
set_buffer_internal (XMARKER (printcharfun)->buffer); \
marker_pos = marker_position (printcharfun); \
if (marker_pos < BEGV || marker_pos > ZV) \
signal_error ("Marker is outside the accessible " \
"part of the buffer", printcharfun); \
old_point = PT; \
old_point_byte = PT_BYTE; \
SET_PT_BOTH (marker_pos, \
marker_byte_position (printcharfun)); \
start_point = PT; \
start_point_byte = PT_BYTE; \
printcharfun = Qnil; \
} \
if (NILP (printcharfun)) \
{ \
Lisp_Object string; \
if (NILP (BVAR (current_buffer, enable_multibyte_characters)) \
&& ! print_escape_multibyte) \
specbind (Qprint_escape_multibyte, Qt); \
if (! NILP (BVAR (current_buffer, enable_multibyte_characters)) \
&& ! print_escape_nonascii) \
specbind (Qprint_escape_nonascii, Qt); \
if (print_buffer != 0) \
{ \
string = make_string_from_bytes (print_buffer, \
print_buffer_pos, \
print_buffer_pos_byte); \
record_unwind_protect (print_unwind, string); \
} \
else \
{ \
int new_size = 1000; \
print_buffer = xmalloc (new_size); \
print_buffer_size = new_size; \
free_print_buffer = 1; \
} \
print_buffer_pos = 0; \
print_buffer_pos_byte = 0; \
} \
if (EQ (printcharfun, Qt) && ! noninteractive) \
setup_echo_area_for_printing (multibyte);
#define PRINTFINISH \
if (NILP (printcharfun)) \
{ \
if (print_buffer_pos != print_buffer_pos_byte \
&& NILP (BVAR (current_buffer, enable_multibyte_characters)))\
{ \
unsigned char *temp = alloca (print_buffer_pos + 1); \
copy_text ((unsigned char *) print_buffer, temp, \
print_buffer_pos_byte, 1, 0); \
insert_1_both ((char *) temp, print_buffer_pos, \
print_buffer_pos, 0, 1, 0); \
} \
else \
insert_1_both (print_buffer, print_buffer_pos, \
print_buffer_pos_byte, 0, 1, 0); \
signal_after_change (PT - print_buffer_pos, 0, print_buffer_pos);\
} \
if (free_print_buffer) \
{ \
xfree (print_buffer); \
print_buffer = 0; \
} \
unbind_to (specpdl_count, Qnil); \
if (MARKERP (original)) \
set_marker_both (original, Qnil, PT, PT_BYTE); \
if (old_point >= 0) \
SET_PT_BOTH (old_point + (old_point >= start_point \
? PT - start_point : 0), \
old_point_byte + (old_point_byte >= start_point_byte \
? PT_BYTE - start_point_byte : 0)); \
set_buffer_internal (old);
#define PRINTCHAR(ch) printchar (ch, printcharfun)
/* This is used to restore the saved contents of print_buffer
when there is a recursive call to print. */
static void
print_unwind (Lisp_Object saved_text)
{
memcpy (print_buffer, SDATA (saved_text), SCHARS (saved_text));
}
/* Print character CH using method FUN. FUN nil means print to
print_buffer. FUN t means print to echo area or stdout if
non-interactive. If FUN is neither nil nor t, call FUN with CH as
argument. */
static void
printchar (unsigned int ch, Lisp_Object fun)
{
if (!NILP (fun) && !EQ (fun, Qt))
call1 (fun, make_number (ch));
else
{
unsigned char str[MAX_MULTIBYTE_LENGTH];
int len = CHAR_STRING (ch, str);
QUIT;
if (NILP (fun))
{
ptrdiff_t incr = len - (print_buffer_size - print_buffer_pos_byte);
if (incr > 0)
print_buffer = xpalloc (print_buffer, &print_buffer_size,
incr, -1, 1);
memcpy (print_buffer + print_buffer_pos_byte, str, len);
print_buffer_pos += 1;
print_buffer_pos_byte += len;
}
else if (noninteractive)
{
fwrite (str, 1, len, stdout);
noninteractive_need_newline = 1;
}
else
{
bool multibyte_p
= !NILP (BVAR (current_buffer, enable_multibyte_characters));
setup_echo_area_for_printing (multibyte_p);
insert_char (ch);
message_dolog ((char *) str, len, 0, multibyte_p);
}
}
}
/* Output SIZE characters, SIZE_BYTE bytes from string PTR using
method PRINTCHARFUN. If SIZE < 0, use the string length of PTR for
both SIZE and SIZE_BYTE. PRINTCHARFUN nil means output to
print_buffer. PRINTCHARFUN t means output to the echo area or to
stdout if non-interactive. If neither nil nor t, call Lisp
function PRINTCHARFUN for each character printed. MULTIBYTE
non-zero means PTR contains multibyte characters.
In the case where PRINTCHARFUN is nil, it is safe for PTR to point
to data in a Lisp string. Otherwise that is not safe. */
static void
strout (const char *ptr, ptrdiff_t size, ptrdiff_t size_byte,
Lisp_Object printcharfun)
{
if (size < 0)
size_byte = size = strlen (ptr);
if (NILP (printcharfun))
{
ptrdiff_t incr = size_byte - (print_buffer_size - print_buffer_pos_byte);
if (incr > 0)
print_buffer = xpalloc (print_buffer, &print_buffer_size, incr, -1, 1);
memcpy (print_buffer + print_buffer_pos_byte, ptr, size_byte);
print_buffer_pos += size;
print_buffer_pos_byte += size_byte;
}
else if (noninteractive && EQ (printcharfun, Qt))
{
fwrite (ptr, 1, size_byte, stdout);
noninteractive_need_newline = 1;
}
else if (EQ (printcharfun, Qt))
{
/* Output to echo area. We're trying to avoid a little overhead
here, that's the reason we don't call printchar to do the
job. */
int i;
bool multibyte_p
= !NILP (BVAR (current_buffer, enable_multibyte_characters));
setup_echo_area_for_printing (multibyte_p);
message_dolog (ptr, size_byte, 0, multibyte_p);
if (size == size_byte)
{
for (i = 0; i < size; ++i)
insert_char ((unsigned char) *ptr++);
}
else
{
int len;
for (i = 0; i < size_byte; i += len)
{
int ch = STRING_CHAR_AND_LENGTH ((const unsigned char *) ptr + i,
len);
insert_char (ch);
}
}
}
else
{
/* PRINTCHARFUN is a Lisp function. */
ptrdiff_t i = 0;
if (size == size_byte)
{
while (i < size_byte)
{
int ch = ptr[i++];
PRINTCHAR (ch);
}
}
else
{
while (i < size_byte)
{
/* Here, we must convert each multi-byte form to the
corresponding character code before handing it to
PRINTCHAR. */
int len;
int ch = STRING_CHAR_AND_LENGTH ((const unsigned char *) ptr + i,
len);
PRINTCHAR (ch);
i += len;
}
}
}
}
/* Print the contents of a string STRING using PRINTCHARFUN.
It isn't safe to use strout in many cases,
because printing one char can relocate. */
static void
print_string (Lisp_Object string, Lisp_Object printcharfun)
{
if (EQ (printcharfun, Qt) || NILP (printcharfun))
{
ptrdiff_t chars;
if (print_escape_nonascii)
string = string_escape_byte8 (string);
if (STRING_MULTIBYTE (string))
chars = SCHARS (string);
else if (! print_escape_nonascii
&& (EQ (printcharfun, Qt)
? ! NILP (BVAR (&buffer_defaults, enable_multibyte_characters))
: ! NILP (BVAR (current_buffer, enable_multibyte_characters))))
{
/* If unibyte string STRING contains 8-bit codes, we must
convert STRING to a multibyte string containing the same
character codes. */
Lisp_Object newstr;
ptrdiff_t bytes;
chars = SBYTES (string);
bytes = count_size_as_multibyte (SDATA (string), chars);
if (chars < bytes)
{
newstr = make_uninit_multibyte_string (chars, bytes);
memcpy (SDATA (newstr), SDATA (string), chars);
str_to_multibyte (SDATA (newstr), bytes, chars);
string = newstr;
}
}
else
chars = SBYTES (string);
if (EQ (printcharfun, Qt))
{
/* Output to echo area. */
ptrdiff_t nbytes = SBYTES (string);
/* Copy the string contents so that relocation of STRING by
GC does not cause trouble. */
USE_SAFE_ALLOCA;
char *buffer = SAFE_ALLOCA (nbytes);
memcpy (buffer, SDATA (string), nbytes);
strout (buffer, chars, nbytes, printcharfun);
SAFE_FREE ();
}
else
/* No need to copy, since output to print_buffer can't GC. */
strout (SSDATA (string), chars, SBYTES (string), printcharfun);
}
else
{
/* Otherwise, string may be relocated by printing one char.
So re-fetch the string address for each character. */
ptrdiff_t i;
ptrdiff_t size = SCHARS (string);
ptrdiff_t size_byte = SBYTES (string);
struct gcpro gcpro1;
GCPRO1 (string);
if (size == size_byte)
for (i = 0; i < size; i++)
PRINTCHAR (SREF (string, i));
else
for (i = 0; i < size_byte; )
{
/* Here, we must convert each multi-byte form to the
corresponding character code before handing it to PRINTCHAR. */
int len;
int ch = STRING_CHAR_AND_LENGTH (SDATA (string) + i, len);
PRINTCHAR (ch);
i += len;
}
UNGCPRO;
}
}
DEFUN ("write-char", Fwrite_char, Swrite_char, 1, 2, 0,
doc: /* Output character CHARACTER to stream PRINTCHARFUN.
PRINTCHARFUN defaults to the value of `standard-output' (which see). */)
(Lisp_Object character, Lisp_Object printcharfun)
{
PRINTDECLARE;
if (NILP (printcharfun))
printcharfun = Vstandard_output;
CHECK_NUMBER (character);
PRINTPREPARE;
PRINTCHAR (XINT (character));
PRINTFINISH;
return character;
}
/* Used from outside of print.c to print a block of SIZE
single-byte chars at DATA on the default output stream.
Do not use this on the contents of a Lisp string. */
void
write_string (const char *data, int size)
{
PRINTDECLARE;
Lisp_Object printcharfun;
printcharfun = Vstandard_output;
PRINTPREPARE;
strout (data, size, size, printcharfun);
PRINTFINISH;
}
/* Used to print a block of SIZE single-byte chars at DATA on a
specified stream PRINTCHARFUN.
Do not use this on the contents of a Lisp string. */
static void
write_string_1 (const char *data, int size, Lisp_Object printcharfun)
{
PRINTDECLARE;
PRINTPREPARE;
strout (data, size, size, printcharfun);
PRINTFINISH;
}
void
temp_output_buffer_setup (const char *bufname)
{
ptrdiff_t count = SPECPDL_INDEX ();
register struct buffer *old = current_buffer;
register Lisp_Object buf;
record_unwind_current_buffer ();
Fset_buffer (Fget_buffer_create (build_string (bufname)));
Fkill_all_local_variables ();
delete_all_overlays (current_buffer);
bset_directory (current_buffer, BVAR (old, directory));
bset_read_only (current_buffer, Qnil);
bset_filename (current_buffer, Qnil);
bset_undo_list (current_buffer, Qt);
eassert (current_buffer->overlays_before == NULL);
eassert (current_buffer->overlays_after == NULL);
bset_enable_multibyte_characters
(current_buffer, BVAR (&buffer_defaults, enable_multibyte_characters));
specbind (Qinhibit_read_only, Qt);
specbind (Qinhibit_modification_hooks, Qt);
Ferase_buffer ();
XSETBUFFER (buf, current_buffer);
Frun_hooks (1, &Qtemp_buffer_setup_hook);
unbind_to (count, Qnil);
specbind (Qstandard_output, buf);
}
static void print (Lisp_Object, Lisp_Object, bool);
static void print_preprocess (Lisp_Object);
static void print_preprocess_string (INTERVAL, Lisp_Object);
static void print_object (Lisp_Object, Lisp_Object, bool);
DEFUN ("terpri", Fterpri, Sterpri, 0, 1, 0,
doc: /* Output a newline to stream PRINTCHARFUN.
If PRINTCHARFUN is omitted or nil, the value of `standard-output' is used. */)
(Lisp_Object printcharfun)
{
PRINTDECLARE;
if (NILP (printcharfun))
printcharfun = Vstandard_output;
PRINTPREPARE;
PRINTCHAR ('\n');
PRINTFINISH;
return Qt;
}
DEFUN ("prin1", Fprin1, Sprin1, 1, 2, 0,
doc: /* Output the printed representation of OBJECT, any Lisp object.
Quoting characters are printed when needed to make output that `read'
can handle, whenever this is possible. For complex objects, the behavior
is controlled by `print-level' and `print-length', which see.
OBJECT is any of the Lisp data types: a number, a string, a symbol,
a list, a buffer, a window, a frame, etc.
A printed representation of an object is text which describes that object.
Optional argument PRINTCHARFUN is the output stream, which can be one
of these:
- a buffer, in which case output is inserted into that buffer at point;
- a marker, in which case output is inserted at marker's position;
- a function, in which case that function is called once for each
character of OBJECT's printed representation;
- a symbol, in which case that symbol's function definition is called; or
- t, in which case the output is displayed in the echo area.
If PRINTCHARFUN is omitted, the value of `standard-output' (which see)
is used instead. */)
(Lisp_Object object, Lisp_Object printcharfun)
{
PRINTDECLARE;
if (NILP (printcharfun))
printcharfun = Vstandard_output;
PRINTPREPARE;
print (object, printcharfun, 1);
PRINTFINISH;
return object;
}
/* a buffer which is used to hold output being built by prin1-to-string */
Lisp_Object Vprin1_to_string_buffer;
DEFUN ("prin1-to-string", Fprin1_to_string, Sprin1_to_string, 1, 2, 0,
doc: /* Return a string containing the printed representation of OBJECT.
OBJECT can be any Lisp object. This function outputs quoting characters
when necessary to make output that `read' can handle, whenever possible,
unless the optional second argument NOESCAPE is non-nil. For complex objects,
the behavior is controlled by `print-level' and `print-length', which see.
OBJECT is any of the Lisp data types: a number, a string, a symbol,
a list, a buffer, a window, a frame, etc.
A printed representation of an object is text which describes that object. */)
(Lisp_Object object, Lisp_Object noescape)
{
Lisp_Object printcharfun;
bool prev_abort_on_gc;
/* struct gcpro gcpro1, gcpro2; */
Lisp_Object save_deactivate_mark;
ptrdiff_t count = SPECPDL_INDEX ();
struct buffer *previous;
specbind (Qinhibit_modification_hooks, Qt);
{
PRINTDECLARE;
/* Save and restore this--we are altering a buffer
but we don't want to deactivate the mark just for that.
No need for specbind, since errors deactivate the mark. */
save_deactivate_mark = Vdeactivate_mark;
/* GCPRO2 (object, save_deactivate_mark); */
prev_abort_on_gc = abort_on_gc;
abort_on_gc = 1;
printcharfun = Vprin1_to_string_buffer;
PRINTPREPARE;
print (object, printcharfun, NILP (noescape));
/* Make Vprin1_to_string_buffer be the default buffer after PRINTFINISH */
PRINTFINISH;
}
previous = current_buffer;
set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
object = Fbuffer_string ();
if (SBYTES (object) == SCHARS (object))
STRING_SET_UNIBYTE (object);
/* Note that this won't make prepare_to_modify_buffer call
ask-user-about-supersession-threat because this buffer
does not visit a file. */
Ferase_buffer ();
set_buffer_internal (previous);
Vdeactivate_mark = save_deactivate_mark;
/* UNGCPRO; */
abort_on_gc = prev_abort_on_gc;
return unbind_to (count, object);
}
DEFUN ("princ", Fprinc, Sprinc, 1, 2, 0,
doc: /* Output the printed representation of OBJECT, any Lisp object.
No quoting characters are used; no delimiters are printed around
the contents of strings.
OBJECT is any of the Lisp data types: a number, a string, a symbol,
a list, a buffer, a window, a frame, etc.
A printed representation of an object is text which describes that object.
Optional argument PRINTCHARFUN is the output stream, which can be one
of these:
- a buffer, in which case output is inserted into that buffer at point;
- a marker, in which case output is inserted at marker's position;
- a function, in which case that function is called once for each
character of OBJECT's printed representation;
- a symbol, in which case that symbol's function definition is called; or
- t, in which case the output is displayed in the echo area.
If PRINTCHARFUN is omitted, the value of `standard-output' (which see)
is used instead. */)
(Lisp_Object object, Lisp_Object printcharfun)
{
PRINTDECLARE;
if (NILP (printcharfun))
printcharfun = Vstandard_output;
PRINTPREPARE;
print (object, printcharfun, 0);
PRINTFINISH;
return object;
}
DEFUN ("print", Fprint, Sprint, 1, 2, 0,
doc: /* Output the printed representation of OBJECT, with newlines around it.
Quoting characters are printed when needed to make output that `read'
can handle, whenever this is possible. For complex objects, the behavior
is controlled by `print-level' and `print-length', which see.
OBJECT is any of the Lisp data types: a number, a string, a symbol,
a list, a buffer, a window, a frame, etc.
A printed representation of an object is text which describes that object.
Optional argument PRINTCHARFUN is the output stream, which can be one
of these:
- a buffer, in which case output is inserted into that buffer at point;
- a marker, in which case output is inserted at marker's position;
- a function, in which case that function is called once for each
character of OBJECT's printed representation;
- a symbol, in which case that symbol's function definition is called; or
- t, in which case the output is displayed in the echo area.
If PRINTCHARFUN is omitted, the value of `standard-output' (which see)
is used instead. */)
(Lisp_Object object, Lisp_Object printcharfun)
{
PRINTDECLARE;
struct gcpro gcpro1;
if (NILP (printcharfun))
printcharfun = Vstandard_output;
GCPRO1 (object);
PRINTPREPARE;
PRINTCHAR ('\n');
print (object, printcharfun, 1);
PRINTCHAR ('\n');
PRINTFINISH;
UNGCPRO;
return object;
}
/* The subroutine object for external-debugging-output is kept here
for the convenience of the debugger. */
Lisp_Object Qexternal_debugging_output;
DEFUN ("external-debugging-output", Fexternal_debugging_output, Sexternal_debugging_output, 1, 1, 0,
doc: /* Write CHARACTER to stderr.
You can call print while debugging emacs, and pass it this function
to make it write to the debugging output. */)
(Lisp_Object character)
{
unsigned int ch;
CHECK_NUMBER (character);
ch = XINT (character);
if (ASCII_CHAR_P (ch))
{
putc (ch, stderr);
#ifdef WINDOWSNT
/* Send the output to a debugger (nothing happens if there isn't
one). */
if (print_output_debug_flag)
{
char buf[2] = {(char) XINT (character), '\0'};
OutputDebugString (buf);
}
#endif
}
else
{
unsigned char mbstr[MAX_MULTIBYTE_LENGTH];
ptrdiff_t len = CHAR_STRING (ch, mbstr);
Lisp_Object encoded_ch =
ENCODE_SYSTEM (make_multibyte_string ((char *) mbstr, 1, len));
fwrite (SSDATA (encoded_ch), SBYTES (encoded_ch), 1, stderr);
#ifdef WINDOWSNT
if (print_output_debug_flag)
OutputDebugString (SSDATA (encoded_ch));
#endif
}
return character;
}
/* This function is never called. Its purpose is to prevent
print_output_debug_flag from being optimized away. */
extern void debug_output_compilation_hack (bool) EXTERNALLY_VISIBLE;
void
debug_output_compilation_hack (bool x)
{
print_output_debug_flag = x;
}
#if defined (GNU_LINUX)
/* This functionality is not vitally important in general, so we rely on
non-portable ability to use stderr as lvalue. */
#define WITH_REDIRECT_DEBUGGING_OUTPUT 1
static FILE *initial_stderr_stream = NULL;
DEFUN ("redirect-debugging-output", Fredirect_debugging_output, Sredirect_debugging_output,
1, 2,
"FDebug output file: \nP",
doc: /* Redirect debugging output (stderr stream) to file FILE.
If FILE is nil, reset target to the initial stderr stream.
Optional arg APPEND non-nil (interactively, with prefix arg) means
append to existing target file. */)
(Lisp_Object file, Lisp_Object append)
{
if (initial_stderr_stream != NULL)
{
block_input ();
fclose (stderr);
unblock_input ();
}
stderr = initial_stderr_stream;
initial_stderr_stream = NULL;
if (STRINGP (file))
{
file = Fexpand_file_name (file, Qnil);
initial_stderr_stream = stderr;
stderr = emacs_fopen (SSDATA (file), NILP (append) ? "w" : "a");
if (stderr == NULL)
{
stderr = initial_stderr_stream;
initial_stderr_stream = NULL;
report_file_error ("Cannot open debugging output stream", file);
}
}
return Qnil;
}
#endif /* GNU_LINUX */
/* This is the interface for debugging printing. */
void
debug_print (Lisp_Object arg)
{
Fprin1 (arg, Qexternal_debugging_output);
fprintf (stderr, "\r\n");
}
void safe_debug_print (Lisp_Object) EXTERNALLY_VISIBLE;
void
safe_debug_print (Lisp_Object arg)
{
int valid = valid_lisp_object_p (arg);
if (valid > 0)
debug_print (arg);
else
fprintf (stderr, "#<%s_LISP_OBJECT 0x%08"pI"x>\r\n",
!valid ? "INVALID" : "SOME",
XLI (arg));
}
DEFUN ("error-message-string", Ferror_message_string, Serror_message_string,
1, 1, 0,
doc: /* Convert an error value (ERROR-SYMBOL . DATA) to an error message.
See Info anchor `(elisp)Definition of signal' for some details on how this
error message is constructed. */)
(Lisp_Object obj)
{
struct buffer *old = current_buffer;
Lisp_Object value;
struct gcpro gcpro1;
/* If OBJ is (error STRING), just return STRING.
That is not only faster, it also avoids the need to allocate
space here when the error is due to memory full. */
if (CONSP (obj) && EQ (XCAR (obj), Qerror)
&& CONSP (XCDR (obj))
&& STRINGP (XCAR (XCDR (obj)))
&& NILP (XCDR (XCDR (obj))))
return XCAR (XCDR (obj));
print_error_message (obj, Vprin1_to_string_buffer, 0, Qnil);
set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
value = Fbuffer_string ();
GCPRO1 (value);
Ferase_buffer ();
set_buffer_internal (old);
UNGCPRO;
return value;
}
/* Print an error message for the error DATA onto Lisp output stream
STREAM (suitable for the print functions).
CONTEXT is a C string describing the context of the error.
CALLER is the Lisp function inside which the error was signaled. */
void
print_error_message (Lisp_Object data, Lisp_Object stream, const char *context,
Lisp_Object caller)
{
Lisp_Object errname, errmsg, file_error, tail;
struct gcpro gcpro1;
if (context != 0)
write_string_1 (context, -1, stream);
/* If we know from where the error was signaled, show it in
*Messages*. */
if (!NILP (caller) && SYMBOLP (caller))
{
Lisp_Object cname = SYMBOL_NAME (caller);
ptrdiff_t cnamelen = SBYTES (cname);
USE_SAFE_ALLOCA;
char *name = SAFE_ALLOCA (cnamelen);
memcpy (name, SDATA (cname), cnamelen);
message_dolog (name, cnamelen, 0, 0);
message_dolog (": ", 2, 0, 0);
SAFE_FREE ();
}
errname = Fcar (data);
if (EQ (errname, Qerror))
{
data = Fcdr (data);
if (!CONSP (data))
data = Qnil;
errmsg = Fcar (data);
file_error = Qnil;
}
else
{
Lisp_Object error_conditions = Fget (errname, Qerror_conditions);
errmsg = Fget (errname, Qerror_message);
file_error = Fmemq (Qfile_error, error_conditions);
}
/* Print an error message including the data items. */
tail = Fcdr_safe (data);
GCPRO1 (tail);
/* For file-error, make error message by concatenating
all the data items. They are all strings. */
if (!NILP (file_error) && CONSP (tail))
errmsg = XCAR (tail), tail = XCDR (tail);
{
const char *sep = ": ";
if (!STRINGP (errmsg))
write_string_1 ("peculiar error", -1, stream);
else if (SCHARS (errmsg))
Fprinc (errmsg, stream);
else
sep = NULL;
for (; CONSP (tail); tail = XCDR (tail), sep = ", ")
{
Lisp_Object obj;
if (sep)
write_string_1 (sep, 2, stream);
obj = XCAR (tail);
if (!NILP (file_error)
|| EQ (errname, Qend_of_file) || EQ (errname, Quser_error))
Fprinc (obj, stream);
else
Fprin1 (obj, stream);
}
}
UNGCPRO;
}
/*
* The buffer should be at least as large as the max string size of the
* largest float, printed in the biggest notation. This is undoubtedly
* 20d float_output_format, with the negative of the C-constant "HUGE"
* from <math.h>.
*
* On the vax the worst case is -1e38 in 20d format which takes 61 bytes.
*
* I assume that IEEE-754 format numbers can take 329 bytes for the worst
* case of -1e307 in 20d float_output_format. What is one to do (short of
* re-writing _doprnt to be more sane)?
* -wsr
* Given the above, the buffer must be least FLOAT_TO_STRING_BUFSIZE bytes.
*/
int
float_to_string (char *buf, double data)
{
char *cp;
int width;
int len;
/* Check for plus infinity in a way that won't lose
if there is no plus infinity. */
if (data == data / 2 && data > 1.0)
{
static char const infinity_string[] = "1.0e+INF";
strcpy (buf, infinity_string);
return sizeof infinity_string - 1;
}
/* Likewise for minus infinity. */
if (data == data / 2 && data < -1.0)
{
static char const minus_infinity_string[] = "-1.0e+INF";
strcpy (buf, minus_infinity_string);
return sizeof minus_infinity_string - 1;
}
/* Check for NaN in a way that won't fail if there are no NaNs. */
if (! (data * 0.0 >= 0.0))
{
/* Prepend "-" if the NaN's sign bit is negative.
The sign bit of a double is the bit that is 1 in -0.0. */
static char const NaN_string[] = "0.0e+NaN";
int i;
union { double d; char c[sizeof (double)]; } u_data, u_minus_zero;
bool negative = 0;
u_data.d = data;
u_minus_zero.d = - 0.0;
for (i = 0; i < sizeof (double); i++)
if (u_data.c[i] & u_minus_zero.c[i])
{
*buf = '-';
negative = 1;
break;
}
strcpy (buf + negative, NaN_string);
return negative + sizeof NaN_string - 1;