lib/errors.c

   1 /*
   2  *      Copyright (C) 2006 Free Software Foundation, Inc.
   3  *      Copyright (C) 2002, 2005 Fabio Fiorina
   4  *
   5  * This file is part of LIBTASN1.
   6  *
   7  * The LIBTASN1 library is free software; you can redistribute it
   8  * and/or modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA
  21  */
  22
  23 #include <int.h>
  24 #include "errors.h"
  25 #ifdef STDC_HEADERS
  26 # include <stdarg.h>
  27 #endif
  28
  29
  30 #define LIBTASN1_ERROR_ENTRY(name) \
  31         { #name, name }
  32
  33 struct libtasn1_error_entry {
  34         const char *name;
  35         int  number;
  36 };
  37 typedef struct libtasn1_error_entry libtasn1_error_entry;
  38
  39 static const libtasn1_error_entry error_algorithms[] = {
  40         LIBTASN1_ERROR_ENTRY( ASN1_SUCCESS ),
  41         LIBTASN1_ERROR_ENTRY( ASN1_FILE_NOT_FOUND ),
  42         LIBTASN1_ERROR_ENTRY( ASN1_ELEMENT_NOT_FOUND ),
  43         LIBTASN1_ERROR_ENTRY( ASN1_IDENTIFIER_NOT_FOUND ),
  44         LIBTASN1_ERROR_ENTRY( ASN1_DER_ERROR ),
  45         LIBTASN1_ERROR_ENTRY( ASN1_VALUE_NOT_FOUND ),
  46         LIBTASN1_ERROR_ENTRY( ASN1_GENERIC_ERROR ),
  47         LIBTASN1_ERROR_ENTRY( ASN1_VALUE_NOT_VALID ),
  48         LIBTASN1_ERROR_ENTRY( ASN1_TAG_ERROR ),
  49         LIBTASN1_ERROR_ENTRY( ASN1_TAG_IMPLICIT ),
  50         LIBTASN1_ERROR_ENTRY( ASN1_ERROR_TYPE_ANY ),
  51         LIBTASN1_ERROR_ENTRY( ASN1_SYNTAX_ERROR ),
  52         LIBTASN1_ERROR_ENTRY( ASN1_MEM_ERROR ),
  53         LIBTASN1_ERROR_ENTRY( ASN1_MEM_ALLOC_ERROR ),
  54         LIBTASN1_ERROR_ENTRY( ASN1_DER_OVERFLOW ),
  55         LIBTASN1_ERROR_ENTRY( ASN1_NAME_TOO_LONG ),
  56         LIBTASN1_ERROR_ENTRY( ASN1_ARRAY_ERROR ),
  57         LIBTASN1_ERROR_ENTRY( ASN1_ELEMENT_NOT_EMPTY ),
  58         {0}
  59 };
  60
  61 #define LIBTASN1_ERROR_LOOP(b) \
  62         const libtasn1_error_entry *p; \
  63                 for(p = error_algorithms; p->name != NULL; p++) { b ; }
  64
  65 #define LIBTASN1_ERROR_ALG_LOOP(a) \
  66                         LIBTASN1_ERROR_LOOP( if(p->number == error) { a; break; } )
  67
  68
  69
  70 /**
  71   * libtasn1_perror - prints a string to stderr with a description of an error
  72   * @error: is an error returned by a libtasn1 function.
  73   *
  74   * This function is like perror(). The only difference is that it
  75   * accepts an error returned by a libtasn1 function.
  76   **/
  77 void libtasn1_perror(asn1_retCode error)
  78 {
  79         const char *ret = NULL;
  80
  81         /* avoid prefix */
  82         LIBTASN1_ERROR_ALG_LOOP(ret =
  83                               p->name + sizeof("ASN1_") - 1);
  84
  85         _libtasn1_log( "LIBTASN1 ERROR: %s\n", ret);
  86
  87 }
  88
  89
  90 /**
  91   * libtasn1_strerror - Returns a string with a description of an error
  92   * @error: is an error returned by a libtasn1 function.
  93   *
  94   * This function is similar to strerror(). The only difference is
  95   * that it accepts an error (number) returned by a libtasn1 function.
  96   *
  97   * Returns: Pointer to static zero-terminated string describing error
  98   *   code.
  99   **/
 100 const char* libtasn1_strerror(asn1_retCode error)
 101 {
 102         const char *ret = NULL;
 103
 104         /* avoid prefix */
 105         LIBTASN1_ERROR_ALG_LOOP(ret =
 106                               p->name + sizeof("ASN1_") - 1);
 107
 108         return ret;
 109 }
 110
 111 /* this function will output a message.
 112  */
 113 #ifdef LIBTASN1_DEBUG
 114 void _libtasn1_log( const char *fmt, ...) {
 115  va_list args;
 116  char str[MAX_LOG_SIZE];
 117
 118  va_start(args,fmt);
 119  vsprintf( str,fmt,args); /* Flawfinder: ignore */
 120  va_end(args);
 121
 122  fprintf(stderr, str);
 123
 124  return;
 125 }
 126 #else /* not DEBUG */
 127 void _libtasn1_log( const char *fmt, ...) {
 128   return;
 129 }
 130 #endif /* DEBUG */