library/platform.c

/*
 *  Platform abstraction layer
 *
 *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 *
 *  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 2 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, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_PLATFORM_C)

#include "mbedtls/platform.h"

#if defined(MBEDTLS_PLATFORM_MEMORY)
#if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
static void *platform_calloc_uninit( size_t n, size_t size )
{
    ((void) n);
    ((void) size);
    return( NULL );
}

#define MBEDTLS_PLATFORM_STD_CALLOC   platform_calloc_uninit
#endif /* !MBEDTLS_PLATFORM_STD_CALLOC */

#if !defined(MBEDTLS_PLATFORM_STD_FREE)
static void platform_free_uninit( void *ptr )
{
    ((void) ptr);
}

#define MBEDTLS_PLATFORM_STD_FREE     platform_free_uninit
#endif /* !MBEDTLS_PLATFORM_STD_FREE */

void * (*mbedtls_calloc)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
void (*mbedtls_free)( void * )     = MBEDTLS_PLATFORM_STD_FREE;

int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
                              void (*free_func)( void * ) )
{
    mbedtls_calloc = calloc_func;
    mbedtls_free = free_func;
    return( 0 );
}
#endif /* MBEDTLS_PLATFORM_MEMORY */

#if defined(_WIN32)
#include <stdarg.h>
int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
{
    int ret;
    va_list argp;

    /* Avoid calling the invalid parameter handler by checking ourselves */
    if( s == NULL || n == 0 || fmt == NULL )
        return( -1 );

    va_start( argp, fmt );
#if defined(_TRUNCATE)
    ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp );
#else
    ret = _vsnprintf( s, n, fmt, argp );
    if( ret < 0 || (size_t) ret == n )
    {
        s[n-1] = '\0';
        ret = -1;
    }
#endif
    va_end( argp );

    return( ret );
}
#endif

#if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
/*
 * Make dummy function to prevent NULL pointer dereferences
 */
static int platform_snprintf_uninit( char * s, size_t n,
                                     const char * format, ... )
{
    ((void) s);
    ((void) n);
    ((void) format);
    return( 0 );
}

#define MBEDTLS_PLATFORM_STD_SNPRINTF    platform_snprintf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */

int (*mbedtls_snprintf)( char * s, size_t n,
                          const char * format,
                          ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;

int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
                                                 const char * format,
                                                 ... ) )
{
    mbedtls_snprintf = snprintf_func;
    return( 0 );
}
#endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */

#if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
/*
 * Make dummy function to prevent NULL pointer dereferences
 */
static int platform_printf_uninit( const char *format, ... )
{
    ((void) format);
    return( 0 );
}

#define MBEDTLS_PLATFORM_STD_PRINTF    platform_printf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_PRINTF */

int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;

int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
{
    mbedtls_printf = printf_func;
    return( 0 );
}
#endif /* MBEDTLS_PLATFORM_PRINTF_ALT */

#if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
/*
 * Make dummy function to prevent NULL pointer dereferences
 */
static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
{
    ((void) stream);
    ((void) format);
    return( 0 );
}

#define MBEDTLS_PLATFORM_STD_FPRINTF   platform_fprintf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */

int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
                                        MBEDTLS_PLATFORM_STD_FPRINTF;

int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
{
    mbedtls_fprintf = fprintf_func;
    return( 0 );
}
#endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */

#if defined(MBEDTLS_PLATFORM_EXIT_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_EXIT)
/*
 * Make dummy function to prevent NULL pointer dereferences
 */
static void platform_exit_uninit( int status )
{
    ((void) status);
}

#define MBEDTLS_PLATFORM_STD_EXIT   platform_exit_uninit
#endif /* !MBEDTLS_PLATFORM_STD_EXIT */

void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;

int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
{
    mbedtls_exit = exit_func;
    return( 0 );
}
#endif /* MBEDTLS_PLATFORM_EXIT_ALT */

#endif /* MBEDTLS_PLATFORM_C */