asn1/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., 59 Temple Place, Suite 330, Boston, MA 02111-1307  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_DER_OVERFLOW ),
  51         LIBTASN1_ERROR_ENTRY( ASN1_NAME_TOO_LONG ),
  52         LIBTASN1_ERROR_ENTRY( ASN1_ARRAY_ERROR ),
  53         LIBTASN1_ERROR_ENTRY( ASN1_ELEMENT_NOT_EMPTY ),
  54         {0}
  55 };
  56
  57 #define LIBTASN1_ERROR_LOOP(b) \
  58         const libtasn1_error_entry *p; \
  59                 for(p = error_algorithms; p->name != NULL; p++) { b ; }
  60
  61 #define LIBTASN1_ERROR_ALG_LOOP(a) \
  62                         LIBTASN1_ERROR_LOOP( if(p->number == error) { a; break; } )
  63
  64
  65
  66 /**
  67   * libtasn1_perror - prints a string to stderr with a description of an error
  68   * @error: is an error returned by a libasn1 function.
  69   *
  70   * This function is like perror(). The only difference is that it accepts an
  71   * error returned by a libasn1 function.
  72   **/
  73 void libtasn1_perror(asn1_retCode error)
  74 {
  75         const char *ret = NULL;
  76
  77         /* avoid prefix */
  78         LIBTASN1_ERROR_ALG_LOOP(ret =
  79                               p->name + sizeof("ASN1_") - 1);
  80
  81         _libtasn1_log( "LIBTASN1 ERROR: %s\n", ret);
  82
  83 }
  84
  85
  86 /**
  87   * libtasn1_strerror - Returns a string with a description of an error
  88   * @error: is an error returned by a libtasn1 function.
  89   *
  90   * This function is similar to strerror(). The only difference is that it
  91   * accepts an error (number) returned by a libasn1 function.
  92   **/
  93 const char* libtasn1_strerror(asn1_retCode error)
  94 {
  95         const char *ret = NULL;
  96
  97         /* avoid prefix */
  98         LIBTASN1_ERROR_ALG_LOOP(ret =
  99                               p->name + sizeof("ASN1_") - 1);
 100
 101         return ret;
 102 }
 103
 104 /* this function will output a message.
 105  */
 106 #ifdef LIBTASN1_DEBUG
 107 void _libtasn1_log( const char *fmt, ...) {
 108  va_list args;
 109  char str[MAX_LOG_SIZE];
 110
 111  va_start(args,fmt);
 112  vsprintf( str,fmt,args); /* Flawfinder: ignore */
 113  va_end(args);
 114
 115  fprintf(stderr, str);
 116
 117  return;
 118 }
 119 #else /* not DEBUG */
 120 # ifndef C99_MACROS
 121
 122 /* Without C99 macros these functions have to
 123  * be called. This may affect performance.
 124  */
 125 void _libtasn1_null_log( void* x, ...) { return; }
 126 # endif /* C99_MACROS */
 127 #endif /* DEBUG */
 128