102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* grabbag - Convenience lib for various routines common to several tools
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* Copyright (C) 2013-2016 Xiph.org Foundation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of the Xiph.org Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <stdarg.h>
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#include "share/compat.h"
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/*
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* FLAC needs to compile and work correctly on systems with a normal ISO C99
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* snprintf as well as Microsoft Visual Studio which has an non-standards
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* conformant snprint_s function.
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*
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* The important difference occurs when the resultant string (plus string
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* terminator) would have been longer than the supplied size parameter. When
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* this happens, ISO C's snprintf returns the length of resultant string, but
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* does not over-write the end of the buffer. MS's snprintf_s in this case
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* returns -1.
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*
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* The _MSC_VER code below attempts to modify the return code for vsnprintf_s
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* to something that is more compatible with the behaviour of the ISO C version.
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*/
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int
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flac_snprintf(char *str, size_t size, const char *fmt, ...)
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{
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va_list va;
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int rc;
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#if defined _MSC_VER
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if (size == 0)
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return 1024;
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#endif
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va_start (va, fmt);
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#if defined _MSC_VER
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rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va);
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if (rc < 0)
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rc = size - 1;
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#elif defined __MINGW32__
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rc = __mingw_vsnprintf (str, size, fmt, va);
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#else
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rc = vsnprintf (str, size, fmt, va);
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#endif
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va_end (va);
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return rc;
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}
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int
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flac_vsnprintf(char *str, size_t size, const char *fmt, va_list va)
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{
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int rc;
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#if defined _MSC_VER
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if (size == 0)
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return 1024;
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rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va);
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if (rc < 0)
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rc = size - 1;
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#elif defined __MINGW32__
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rc = __mingw_vsnprintf (str, size, fmt, va);
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#else
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rc = vsnprintf (str, size, fmt, va);
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#endif
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return rc;
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}
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