1 /* Formatted output to strings.
2 Copyright (C) 2004, 2006-2007 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
31 #include "vasnprintf.h"
33 /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */
35 # define EOVERFLOW E2BIG
39 # define SIZE_MAX ((size_t) -1)
42 /* Print formatted output to string STR.
43 Return string length of formatted string. On error, return a negative
46 sprintf (char *str, const char *format, ...)
53 /* vasnprintf fails with EOVERFLOW when the buffer size argument is larger
54 than INT_MAX (if that fits into a 'size_t' at all).
55 Also note that glibc's iconv fails with E2BIG when we pass a length that
56 is so large that str + lenbuf wraps around, i.e.
57 (uintptr_t) (str + lenbuf) < (uintptr_t) str.
58 Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */
59 lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX);
60 if (lenbuf > ~ (uintptr_t) str)
61 lenbuf = ~ (uintptr_t) str;
63 va_start (args, format);
64 output = vasnprintf (str, &lenbuf, format, args);
73 /* len is near SIZE_MAX. */