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author | Ludovic Courtès <ludo@gnu.org> | 2009-07-05 23:57:37 +0200 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2009-07-05 23:57:37 +0200 |
commit | c4b681fdacc57de0b2a9584c1f6a195cf2629b32 (patch) | |
tree | 6314adbbde6f9e64282120ad1d43db9034f41034 /lib/vsnprintf.c | |
parent | 5374ec9c281c2e77c283f60afd55e47d86e3b898 (diff) | |
download | guile-c4b681fdacc57de0b2a9584c1f6a195cf2629b32.tar.gz |
Use Gnulib's `vsnprintf' module.
* m4/gnulib-cache.m4: Use `vsnprintf', needed by `deprecation.c'.
Diffstat (limited to 'lib/vsnprintf.c')
-rw-r--r-- | lib/vsnprintf.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/vsnprintf.c b/lib/vsnprintf.c new file mode 100644 index 000000000..1fdfb6bc8 --- /dev/null +++ b/lib/vsnprintf.c @@ -0,0 +1,71 @@ +/* Formatted output to strings. + Copyright (C) 2004, 2006-2008 Free Software Foundation, Inc. + Written by Simon Josefsson and Yoann Vandoorselaere <yoann@prelude-ids.org>. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License along + with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +/* Specification. */ +#include <stdio.h> + +#include <errno.h> +#include <limits.h> +#include <stdarg.h> +#include <stdlib.h> +#include <string.h> + +#include "vasnprintf.h" + +/* Print formatted output to string STR. Similar to vsprintf, but + additional length SIZE limit how much is written into STR. Returns + string length of formatted string (which may be larger than SIZE). + STR may be NULL, in which case nothing will be written. On error, + return a negative value. */ +int +vsnprintf (char *str, size_t size, const char *format, va_list args) +{ + char *output; + size_t len; + size_t lenbuf = size; + + output = vasnprintf (str, &lenbuf, format, args); + len = lenbuf; + + if (!output) + return -1; + + if (output != str) + { + if (size) + { + size_t pruned_len = (len < size ? len : size - 1); + memcpy (str, output, pruned_len); + str[pruned_len] = '\0'; + } + + free (output); + } + + if (len > INT_MAX) + { + errno = EOVERFLOW; + return -1; + } + + return len; +} |