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72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/*
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* C99-compatible snprintf() and vsnprintf() implementations
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* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <string.h>
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#include "compat/va_copy.h"
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#include "libavutil/error.h"
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#if defined(__MINGW32__)
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#define EOVERFLOW EFBIG
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#endif
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int avpriv_snprintf(char *s, size_t n, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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ret = avpriv_vsnprintf(s, n, fmt, ap);
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va_end(ap);
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return ret;
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}
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int avpriv_vsnprintf(char *s, size_t n, const char *fmt,
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va_list ap)
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{
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int ret;
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va_list ap_copy;
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if (n == 0)
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return _vscprintf(fmt, ap);
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else if (n > INT_MAX)
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return AVERROR(EOVERFLOW);
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/* we use n - 1 here because if the buffer is not big enough, the MS
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* runtime libraries don't add a terminating zero at the end. MSDN
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* recommends to provide _snprintf/_vsnprintf() a buffer size that
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* is one less than the actual buffer, and zero it before calling
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* _snprintf/_vsnprintf() to workaround this problem.
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* See https://web.archive.org/web/20151214111935/http://msdn.microsoft.com/en-us/library/1kt27hek(v=vs.80).aspx */
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memset(s, 0, n);
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va_copy(ap_copy, ap);
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ret = _vsnprintf(s, n - 1, fmt, ap_copy);
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va_end(ap_copy);
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if (ret == -1)
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ret = _vscprintf(fmt, ap);
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return ret;
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}
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