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 {
  35   const char *name;
  36   int number;
  37 };
  38 typedef struct libtasn1_error_entry libtasn1_error_entry;
  39
  40 static const libtasn1_error_entry error_algorithms[] = {
  41   LIBTASN1_ERROR_ENTRY (ASN1_SUCCESS),
  42   LIBTASN1_ERROR_ENTRY (ASN1_FILE_NOT_FOUND),
  43   LIBTASN1_ERROR_ENTRY (ASN1_ELEMENT_NOT_FOUND),
  44   LIBTASN1_ERROR_ENTRY (ASN1_IDENTIFIER_NOT_FOUND),
  45   LIBTASN1_ERROR_ENTRY (ASN1_DER_ERROR),
  46   LIBTASN1_ERROR_ENTRY (ASN1_VALUE_NOT_FOUND),
  47   LIBTASN1_ERROR_ENTRY (ASN1_GENERIC_ERROR),
  48   LIBTASN1_ERROR_ENTRY (ASN1_VALUE_NOT_VALID),
  49   LIBTASN1_ERROR_ENTRY (ASN1_TAG_ERROR),
  50   LIBTASN1_ERROR_ENTRY (ASN1_TAG_IMPLICIT),
  51   LIBTASN1_ERROR_ENTRY (ASN1_ERROR_TYPE_ANY),
  52   LIBTASN1_ERROR_ENTRY (ASN1_SYNTAX_ERROR),
  53   LIBTASN1_ERROR_ENTRY (ASN1_MEM_ERROR),
  54   LIBTASN1_ERROR_ENTRY (ASN1_MEM_ALLOC_ERROR),
  55   LIBTASN1_ERROR_ENTRY (ASN1_DER_OVERFLOW),
  56   LIBTASN1_ERROR_ENTRY (ASN1_NAME_TOO_LONG),
  57   LIBTASN1_ERROR_ENTRY (ASN1_ARRAY_ERROR),
  58   LIBTASN1_ERROR_ENTRY (ASN1_ELEMENT_NOT_EMPTY),
  59   {0}
  60 };
  61
  62 #define LIBTASN1_ERROR_LOOP(b) \
  63         const libtasn1_error_entry *p; \
  64                 for(p = error_algorithms; p->name != NULL; p++) { b ; }
  65
  66 #define LIBTASN1_ERROR_ALG_LOOP(a) \
  67                         LIBTASN1_ERROR_LOOP( if(p->number == error) { a; break; } )
  68
  69
  70
  71 /**
  72   * libtasn1_perror - prints a string to stderr with a description of an error
  73   * @error: is an error returned by a libtasn1 function.
  74   *
  75   * This function is like perror(). The only difference is that it
  76   * accepts an error returned by a libtasn1 function.
  77   **/
  78 void
  79 libtasn1_perror (asn1_retCode error)
  80 {
  81   const char *ret = NULL;
  82
  83   /* avoid prefix */
  84   LIBTASN1_ERROR_ALG_LOOP (ret = p->name + sizeof ("ASN1_") - 1);
  85
  86   _libtasn1_log ("LIBTASN1 ERROR: %s\n", ret);
  87
  88 }
  89
  90
  91 /**
  92   * libtasn1_strerror - Returns a string with a description of an error
  93   * @error: is an error returned by a libtasn1 function.
  94   *
  95   * This function is similar to strerror(). The only difference is
  96   * that it accepts an error (number) returned by a libtasn1 function.
  97   *
  98   * Returns: Pointer to static zero-terminated string describing error
  99   *   code.
 100   **/
 101 const char *
 102 libtasn1_strerror (asn1_retCode error)
 103 {
 104   const char *ret = NULL;
 105
 106   /* avoid prefix */
 107   LIBTASN1_ERROR_ALG_LOOP (ret = p->name + sizeof ("ASN1_") - 1);
 108
 109   return ret;
 110 }
 111
 112 /* this function will output a message.
 113  */
 114 #ifdef LIBTASN1_DEBUG
 115 void
 116 _libtasn1_log (const char *fmt, ...)
 117 {
 118   va_list args;
 119   char str[MAX_LOG_SIZE];
 120
 121   va_start (args, fmt);
 122   vsprintf (str, fmt, args);    /* Flawfinder: ignore */
 123   va_end (args);
 124
 125   fprintf (stderr, str);
 126
 127   return;
 128 }
 129 #else /* not DEBUG */
 130 void
 131 _libtasn1_log (const char *fmt, ...)
 132 {
 133   return;
 134 }
 135 #endif /* DEBUG */