Mercurial > gnulib
view lib/vfprintf.c @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children |
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/* Formatted output to a stream. Copyright (C) 2004, 2006-2019 Free Software Foundation, Inc. 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 the Free Software Foundation; either version 3 of the License, 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif /* Specification. */ #include <stdio.h> #include <errno.h> #include <limits.h> #include <stdarg.h> #include <stdlib.h> #include "fseterr.h" #include "vasnprintf.h" /* Print formatted output to the stream FP. Return string length of formatted string. On error, return a negative value. */ int vfprintf (FILE *fp, const char *format, va_list args) { char buf[2000]; char *output; size_t len; size_t lenbuf = sizeof (buf); output = vasnprintf (buf, &lenbuf, format, args); len = lenbuf; if (!output) { fseterr (fp); return -1; } if (fwrite (output, 1, len, fp) < len) { if (output != buf) { int saved_errno = errno; free (output); errno = saved_errno; } return -1; } if (output != buf) free (output); if (len > INT_MAX) { errno = EOVERFLOW; fseterr (fp); return -1; } return len; }