/* Formatted output to strings.
- Copyright (C) 2004 Free Software Foundation, Inc.
- Written by Simon Josefsson.
+ Copyright (C) 2004, 2006-2011 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 General Public License as published by
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-/* Get specification. */
-#include "snprintf.h"
+/* Specification. */
+#include <stdio.h>
-/* Get memcpy. */
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdlib.h>
#include <string.h>
-/* Get vasnprintf. */
#include "vasnprintf.h"
-/* Get MIN. */
-#include "minmax.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. */
+ return a negative value. */
int
snprintf (char *str, size_t size, const char *format, ...)
{
+ char *output;
size_t len;
- char *out = vasnprintf (NULL, &len, format, args);
+ size_t lenbuf = size;
+ va_list args;
+
+ va_start (args, format);
+ output = vasnprintf (str, &lenbuf, format, args);
+ len = lenbuf;
+ va_end (args);
- if (!out)
+ if (!output)
return -1;
- if (str)
+ if (output != str)
{
- memcpy (str, out, MIN (len + 1, size));
- str[size - 1] = '\0';
+ if (size)
+ {
+ size_t pruned_len = (len < size ? len : size - 1);
+ memcpy (str, output, pruned_len);
+ str[pruned_len] = '\0';
+ }
+
+ free (output);
}
- free (out);
+ if (INT_MAX < len)
+ {
+ errno = EOVERFLOW;
+ return -1;
+ }
return len;
}