1 /* Formatted output to strings.
2 Copyright (C) 2004, 2006-2020 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 3 of the License, or
7 (at your option) any later version.
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
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
30 #include "vasnprintf.h"
33 # define SIZE_MAX ((size_t) -1)
36 /* Print formatted output to string STR.
37 Return string length of formatted string. On error, return a negative
40 vsprintf (char *str
, const char *format
, va_list args
)
46 /* vasnprintf fails with EOVERFLOW when the buffer size argument is larger
47 than INT_MAX (if that fits into a 'size_t' at all).
48 Also note that glibc's iconv fails with E2BIG when we pass a length that
49 is so large that str + lenbuf wraps around, i.e.
50 (uintptr_t) (str + lenbuf) < (uintptr_t) str.
51 Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */
52 lenbuf
= (SIZE_MAX
< INT_MAX
? SIZE_MAX
: INT_MAX
);
53 if (lenbuf
> ~ (uintptr_t) str
)
54 lenbuf
= ~ (uintptr_t) str
;
56 output
= vasnprintf (str
, &lenbuf
, format
, args
);
64 /* len is near SIZE_MAX. */