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/*
This file is part of libmicrohttpd
Copyright (C) 2014-2016 Karlson2k (Evgeny Grin)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file microhttpd/mhd_compat.c
* @brief Implementation of platform missing functions.
* @author Karlson2k (Evgeny Grin)
*/
#include "mhd_compat.h"
#if defined(_WIN32) && ! defined(__CYGWIN__)
#include <stdint.h>
#include <time.h>
#ifndef HAVE_SNPRINTF
#include <stdio.h>
#include <stdarg.h>
#endif /* HAVE_SNPRINTF */
#endif /* _WIN32 && !__CYGWIN__ */
#ifndef HAVE_CALLOC
#include <string.h> /* for memset() */
#endif /* ! HAVE_CALLOC */
#if defined(_WIN32) && ! defined(__CYGWIN__)
#ifndef HAVE_SNPRINTF
/* Emulate snprintf function on W32 */
int
W32_snprintf (char *__restrict s,
size_t n,
const char *__restrict format,
...)
{
int ret;
va_list args;
if ( (0 != n) &&
(NULL != s) )
{
va_start (args,
format);
ret = _vsnprintf (s,
n,
format,
args);
va_end (args);
if ((int) n == ret)
s[n - 1] = 0;
if (ret >= 0)
return ret;
}
va_start (args,
format);
ret = _vscprintf (format,
args);
va_end (args);
if ( (0 <= ret) &&
(0 != n) &&
(NULL == s) )
return -1;
return ret;
}
#endif /* HAVE_SNPRINTF */
#endif /* _WIN32 && !__CYGWIN__ */
#ifndef HAVE_CALLOC
#ifdef __has_builtin
# if __has_builtin (__builtin_mul_overflow)
# define MHD_HAVE_NUL_OVERFLOW 1
# endif
#elif __GNUC__ + 0 >= 5
# define MHD_HAVE_NUL_OVERFLOW 1
#endif /* __GNUC__ >= 5 */
void *
MHD_calloc_ (size_t nelem, size_t elsize)
{
size_t alloc_size;
void *ptr;
#ifdef MHD_HAVE_NUL_OVERFLOW
if (__builtin_mul_overflow (nelem, elsize, &alloc_size) || (0 == alloc_size))
return NULL;
#else /* ! MHD_HAVE_NUL_OVERFLOW */
alloc_size = nelem * elsize;
if ((0 == alloc_size) || (elsize != alloc_size / nelem))
return NULL;
#endif /* ! MHD_HAVE_NUL_OVERFLOW */
ptr = malloc (alloc_size);
if (NULL == ptr)
return NULL;
memset (ptr, 0, alloc_size);
return ptr;
}
#endif /* ! HAVE_CALLOC */
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