mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
synced 2026-06-15 23:35:50 +00:00
Bruno Haible
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/* Formatted output to strings.
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Copyright (C) 2004, 2006-2007 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Specification. */
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#include <stdio.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "vasnprintf.h"
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/* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW. */
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#ifndef EOVERFLOW
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# define EOVERFLOW E2BIG
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#endif
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#ifndef SIZE_MAX
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# define SIZE_MAX ((size_t) -1)
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#endif
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/* Print formatted output to string STR.
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Return string length of formatted string. On error, return a negative
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value. */
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int
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sprintf (char *str, const char *format, ...)
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{
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char *output;
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size_t len;
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size_t lenbuf;
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va_list args;
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/* vasnprintf fails with EOVERFLOW when the buffer size argument is larger
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than INT_MAX (if that fits into a 'size_t' at all).
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Also note that glibc's iconv fails with E2BIG when we pass a length that
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is so large that str + lenbuf wraps around, i.e.
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(uintptr_t) (str + lenbuf) < (uintptr_t) str.
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Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1). */
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lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX);
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if (lenbuf > ~ (uintptr_t) str)
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lenbuf = ~ (uintptr_t) str;
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va_start (args, format);
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output = vasnprintf (str, &lenbuf, format, args);
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len = lenbuf;
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va_end (args);
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if (!output)
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return -1;
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if (output != str)
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{
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/* len is near SIZE_MAX. */
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free (output);
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errno = EOVERFLOW;
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return -1;
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}
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if (len > INT_MAX)
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{
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errno = EOVERFLOW;
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return -1;
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}
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return len;
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}
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