Mercurial > hg > octave-kai > gnulib-hg

annotate lib/snprintf.c @ 6836:e2c19cb657e7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Tweak for FreeBSD.
author Bruno Haible <bruno@clisp.org>
date Sat, 17 Jun 2006 20:02:16 +0000
parents a48fb0e98c8c
children 8f07495555ba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
1 /* Formatted output to strings.
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
2 Copyright (C) 2004 Free Software Foundation, Inc.
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
3 Written by Simon Josefsson.
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
4
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
5 This program is free software; you can redistribute it and/or modify
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
6 it under the terms of the GNU General Public License as published by
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
7 the Free Software Foundation; either version 2, or (at your option)
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
8 any later version.
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
9
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
10 This program is distributed in the hope that it will be useful,
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
13 GNU General Public License for more details.
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
14
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
15 You should have received a copy of the GNU General Public License along
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
16 with this program; if not, write to the Free Software Foundation,
5848
a48fb0e98c8c *** empty log message ***
Paul Eggert <eggert@cs.ucla.edu>
parents: 5333
diff changeset
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
18
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
19 #ifdef HAVE_CONFIG_H
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
20 # include <config.h>
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
21 #endif
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
22
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
23 #include "snprintf.h"
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
24
5290
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
25 #include <stdarg.h>
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
26 #include <stdlib.h>
5288
553713ba9dac Ensure memcpy is declared.
Bruno Haible <bruno@clisp.org>
parents: 5282
diff changeset
27 #include <string.h>
553713ba9dac Ensure memcpy is declared.
Bruno Haible <bruno@clisp.org>
parents: 5282
diff changeset
28
5293
3e17fb121416 Remove comments as to why each header is needed.
Paul Eggert <eggert@cs.ucla.edu>
parents: 5291
diff changeset
29 #include "minmax.h"
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
30 #include "vasnprintf.h"
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
31
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
32 /* Print formatted output to string STR. Similar to sprintf, but
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
33 additional length SIZE limit how much is written into STR. Returns
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
34 string length of formatted string (which may be larger than SIZE).
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
35 STR may be NULL, in which case nothing will be written. On error,
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
36 return a negative value. */
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
37 int
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
38 snprintf (char *str, size_t size, const char *format, ...)
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
39 {
5290
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
40 char *output;
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
41 size_t len;
5290
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
42 va_list args;
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
43
5290
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
44 va_start (args, format);
5333
f038f3333cc8 Avoid a memory allocation when possible.
Bruno Haible <bruno@clisp.org>
parents: 5293
diff changeset
45 len = size;
f038f3333cc8 Avoid a memory allocation when possible.
Bruno Haible <bruno@clisp.org>
parents: 5293
diff changeset
46 output = vasnprintf (str, &len, format, args);
5290
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
47 va_end (args);
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
48
a32d2a4a925f Fixes, mostly from Simon Josefsson.
Bruno Haible <bruno@clisp.org>
parents: 5288
diff changeset
49 if (!output)
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
50 return -1;
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
51
5333
f038f3333cc8 Avoid a memory allocation when possible.
Bruno Haible <bruno@clisp.org>
parents: 5293
diff changeset
52 if (str != NULL)
f038f3333cc8 Avoid a memory allocation when possible.
Bruno Haible <bruno@clisp.org>
parents: 5293
diff changeset
53 if (len > size - 1) /* equivalent to: (size > 0 && len >= size) */
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
54 str[size - 1] = '\0';
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
55
5333
f038f3333cc8 Avoid a memory allocation when possible.
Bruno Haible <bruno@clisp.org>
parents: 5293
diff changeset
56 if (output != str)
f038f3333cc8 Avoid a memory allocation when possible.
Bruno Haible <bruno@clisp.org>
parents: 5293
diff changeset
57 free (output);
5282
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
58
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
59 return len;
149d795beeb2 New snprintf module from Simon Josefsson.
Paul Eggert <eggert@cs.ucla.edu>
parents:
diff changeset
60 }