programs/util/strerror.c

/*
 *  Translate error code to error string
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#include "mbedtls/build_info.h"

#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_printf     printf
#define mbedtls_exit       exit
#endif

#if defined(MBEDTLS_ERROR_C) || defined(MBEDTLS_ERROR_STRERROR_DUMMY)
#include "mbedtls/error.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif

#define USAGE \
    "\n usage: strerror <errorcode>\n" \
    "\n where <errorcode> can be a decimal or hexadecimal (starts with 0x or -0x)\n"

#if !defined(MBEDTLS_ERROR_C) && !defined(MBEDTLS_ERROR_STRERROR_DUMMY)
int main( void )
{
    mbedtls_printf("MBEDTLS_ERROR_C and/or MBEDTLS_ERROR_STRERROR_DUMMY not defined.\n");
    mbedtls_exit( 0 );
}
#else
int main( int argc, char *argv[] )
{
    long int val;
    char *end = argv[1];

    if( argc != 2 )
    {
        mbedtls_printf( USAGE );
        mbedtls_exit( 0 );
    }

    val = strtol( argv[1], &end, 10 );
    if( *end != '\0' )
    {
        val = strtol( argv[1], &end, 16 );
        if( *end != '\0' )
        {
            mbedtls_printf( USAGE );
            return( 0 );
        }
    }
    if( val > 0 )
        val = -val;

    if( val != 0 )
    {
        char error_buf[200];
        mbedtls_strerror( val, error_buf, 200 );
        mbedtls_printf("Last error was: -0x%04x - %s\n\n", (unsigned int) -val, error_buf );
    }

    mbedtls_exit( val );
}
#endif /* MBEDTLS_ERROR_C */