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author | Neil Jerram <neil@ossau.uklinux.net> | 2010-04-10 13:32:42 +0100 |
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committer | Neil Jerram <neil@ossau.uklinux.net> | 2010-04-10 13:32:42 +0100 |
commit | 26b9f9090073c896762af3125af54958e153f8f2 (patch) | |
tree | 11c799f1191ef122c66329c36d6b03230c6962ef /lib/snprintf.c | |
parent | 3ce5e1304bd77eb167f856a2a163038f01f452c8 (diff) | |
parent | 96ec2c9c65468b1404865371d19342d6badb0be9 (diff) | |
download | guile-26b9f9090073c896762af3125af54958e153f8f2.tar.gz |
Merge branch 'master' into wip-manual-2
Conflicts:
doc/ref/api-procedures.texi
doc/ref/misc-modules.texi
(Caused by me removing `@page' from a couple of sections that have been modified
by others.)
Diffstat (limited to 'lib/snprintf.c')
-rw-r--r-- | lib/snprintf.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/lib/snprintf.c b/lib/snprintf.c new file mode 100644 index 000000000..424367934 --- /dev/null +++ b/lib/snprintf.c @@ -0,0 +1,72 @@ +/* Formatted output to strings. + Copyright (C) 2004, 2006-2010 Free Software Foundation, Inc. + Written by Simon Josefsson and Paul Eggert. + + 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. */ + +#include <config.h> + +/* 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 sprintf, 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 +snprintf (char *str, size_t size, const char *format, ...) +{ + char *output; + size_t len; + size_t lenbuf = size; + va_list args; + + va_start (args, format); + output = vasnprintf (str, &lenbuf, format, args); + len = lenbuf; + va_end (args); + + 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 (INT_MAX < len) + { + errno = EOVERFLOW; + return -1; + } + + return len; +} |