lib/errors.c

   1 /*              Copyright (C) 2002 Fabio Fiorina
   2  *
   3  * This file is part of LIBASN1.
   4  *
   5  * The LIBTASN1 library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,  USA
  18  */
  19
  20 #include <int.h>
  21 #include "errors.h"
  22 #ifdef STDC_HEADERS
  23 # include <stdarg.h>
  24 #endif
  25
  26
  27 #define LIBTASN1_ERROR_ENTRY(name) \
  28         { #name, name }
  29
  30 struct libtasn1_error_entry {
  31         const char *name;
  32         int  number;
  33 };
  34 typedef struct libtasn1_error_entry libtasn1_error_entry;
  35
  36 static libtasn1_error_entry error_algorithms[] = {
  37         LIBTASN1_ERROR_ENTRY( ASN1_SUCCESS ),
  38         LIBTASN1_ERROR_ENTRY( ASN1_FILE_NOT_FOUND ),
  39         LIBTASN1_ERROR_ENTRY( ASN1_ELEMENT_NOT_FOUND ),
  40         LIBTASN1_ERROR_ENTRY( ASN1_IDENTIFIER_NOT_FOUND ),
  41         LIBTASN1_ERROR_ENTRY( ASN1_DER_ERROR ),
  42         LIBTASN1_ERROR_ENTRY( ASN1_VALUE_NOT_FOUND ),
  43         LIBTASN1_ERROR_ENTRY( ASN1_GENERIC_ERROR ),
  44         LIBTASN1_ERROR_ENTRY( ASN1_VALUE_NOT_VALID ),
  45         LIBTASN1_ERROR_ENTRY( ASN1_TAG_ERROR ),
  46         LIBTASN1_ERROR_ENTRY( ASN1_TAG_IMPLICIT ),
  47         LIBTASN1_ERROR_ENTRY( ASN1_ERROR_TYPE_ANY ),
  48         LIBTASN1_ERROR_ENTRY( ASN1_SYNTAX_ERROR ),
  49         LIBTASN1_ERROR_ENTRY( ASN1_MEM_ERROR ),
  50         LIBTASN1_ERROR_ENTRY( ASN1_MEM_ALLOC_ERROR ),
  51         LIBTASN1_ERROR_ENTRY( ASN1_DER_OVERFLOW ),
  52         LIBTASN1_ERROR_ENTRY( ASN1_NAME_TOO_LONG ),
  53         LIBTASN1_ERROR_ENTRY( ASN1_ARRAY_ERROR ),
  54         LIBTASN1_ERROR_ENTRY( ASN1_ELEMENT_NOT_EMPTY ),
  55         {0}
  56 };
  57
  58 #define LIBTASN1_ERROR_LOOP(b) \
  59         const libtasn1_error_entry *p; \
  60                 for(p = error_algorithms; p->name != NULL; p++) { b ; }
  61
  62 #define LIBTASN1_ERROR_ALG_LOOP(a) \
  63                         LIBTASN1_ERROR_LOOP( if(p->number == error) { a; break; } )
  64
  65
  66
  67 /**
  68   * libtasn1_perror - prints a string to stderr with a description of an error
  69   * @error: is an error returned by a libasn1 function.
  70   *
  71   * This function is like perror(). The only difference is that it
  72   * accepts an error returned by a libasn1 function.
  73   **/
  74 void libtasn1_perror(asn1_retCode error)
  75 {
  76         const char *ret = NULL;
  77
  78         /* avoid prefix */
  79         LIBTASN1_ERROR_ALG_LOOP(ret =
  80                               p->name + sizeof("ASN1_") - 1);
  81
  82         _libtasn1_log( "LIBTASN1 ERROR: %s\n", ret);
  83
  84 }
  85
  86
  87 /**
  88   * libtasn1_strerror - Returns a string with a description of an error
  89   * @error: is an error returned by a libtasn1 function.
  90   *
  91   * This function is similar to strerror(). The only difference is
  92   * that it accepts an error (number) returned by a libasn1 function.
  93   *
  94   * Returns: Pointer to static zero-terminated string describing error
  95   *   code.
  96   **/
  97 const char* libtasn1_strerror(asn1_retCode error)
  98 {
  99         const char *ret = NULL;
 100
 101         /* avoid prefix */
 102         LIBTASN1_ERROR_ALG_LOOP(ret =
 103                               p->name + sizeof("ASN1_") - 1);
 104
 105         return ret;
 106 }
 107
 108 /* this function will output a message.
 109  */
 110 #ifdef LIBTASN1_DEBUG
 111 void _libtasn1_log( const char *fmt, ...) {
 112  va_list args;
 113  char str[MAX_LOG_SIZE];
 114
 115  va_start(args,fmt);
 116  vsprintf( str,fmt,args); /* Flawfinder: ignore */
 117  va_end(args);
 118
 119  fprintf(stderr, str);
 120
 121  return;
 122 }
 123 #else /* not DEBUG */
 124 # ifndef C99_MACROS
 125
 126 /* Without C99 macros these functions have to
 127  * be called. This may affect performance.
 128  */
 129 void _libtasn1_null_log( void* x, ...) { return; }
 130 # endif /* C99_MACROS */
 131 #endif /* DEBUG */