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  1. /*
  2.  * This file is part of FFmpeg.
  3.  *
  4.  * FFmpeg is free software; you can redistribute it and/or
  5.  * modify it under the terms of the GNU Lesser General Public
  6.  * License as published by the Free Software Foundation; either
  7.  * version 2.1 of the License, or (at your option) any later version.
  8.  *
  9.  * FFmpeg is distributed in the hope that it will be useful,
  10.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12.  * Lesser General Public License for more details.
  13.  *
  14.  * You should have received a copy of the GNU Lesser General Public
  15.  * License along with FFmpeg; if not, write to the Free Software
  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17.  */
  18.  
  19. #undef _GNU_SOURCE
  20. #include "avutil.h"
  21. #include "avstring.h"
  22. #include "common.h"
  23.  
  24. struct error_entry {
  25.     int num;
  26.     const char *tag;
  27.     const char *str;
  28. };
  29.  
  30. #define ERROR_TAG(tag) AVERROR_##tag, #tag
  31. static const struct error_entry error_entries[] = {
  32.     { ERROR_TAG(BSF_NOT_FOUND),      "Bitstream filter not found"                     },
  33.     { ERROR_TAG(BUG),                "Internal bug, should not have happened"         },
  34.     { ERROR_TAG(BUG2),               "Internal bug, should not have happened"         },
  35.     { ERROR_TAG(BUFFER_TOO_SMALL),   "Buffer too small"                               },
  36.     { ERROR_TAG(DECODER_NOT_FOUND),  "Decoder not found"                              },
  37.     { ERROR_TAG(DEMUXER_NOT_FOUND),  "Demuxer not found"                              },
  38.     { ERROR_TAG(ENCODER_NOT_FOUND),  "Encoder not found"                              },
  39.     { ERROR_TAG(EOF),                "End of file"                                    },
  40.     { ERROR_TAG(EXIT),               "Immediate exit requested"                       },
  41.     { ERROR_TAG(EXTERNAL),           "Generic error in an external library"           },
  42.     { ERROR_TAG(FILTER_NOT_FOUND),   "Filter not found"                               },
  43.     { ERROR_TAG(INVALIDDATA),        "Invalid data found when processing input"       },
  44.     { ERROR_TAG(MUXER_NOT_FOUND),    "Muxer not found"                                },
  45.     { ERROR_TAG(OPTION_NOT_FOUND),   "Option not found"                               },
  46.     { ERROR_TAG(PATCHWELCOME),       "Not yet implemented in FFmpeg, patches welcome" },
  47.     { ERROR_TAG(PROTOCOL_NOT_FOUND), "Protocol not found"                             },
  48.     { ERROR_TAG(STREAM_NOT_FOUND),   "Stream not found"                               },
  49.     { ERROR_TAG(UNKNOWN),            "Unknown error occurred"                         },
  50.     { ERROR_TAG(EXPERIMENTAL),       "Experimental feature"                           },
  51. };
  52.  
  53. int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
  54. {
  55.     int ret = 0, i;
  56.     const struct error_entry *entry = NULL;
  57.  
  58.     for (i = 0; i < FF_ARRAY_ELEMS(error_entries); i++) {
  59.         if (errnum == error_entries[i].num) {
  60.             entry = &error_entries[i];
  61.             break;
  62.         }
  63.     }
  64.     if (entry) {
  65.         av_strlcpy(errbuf, entry->str, errbuf_size);
  66.     } else {
  67. #if HAVE_STRERROR_R
  68.         ret = AVERROR(strerror_r(AVUNERROR(errnum), errbuf, errbuf_size));
  69. #else
  70.         ret = -1;
  71. #endif
  72.         if (ret < 0)
  73.             snprintf(errbuf, errbuf_size, "Error number %d occurred", errnum);
  74.     }
  75.  
  76.     return ret;
  77. }
  78.  
  79. #ifdef TEST
  80.  
  81. #undef printf
  82.  
  83. int main(void)
  84. {
  85.     int i;
  86.  
  87.     for (i = 0; i < FF_ARRAY_ELEMS(error_entries); i++) {
  88.         const struct error_entry *entry = &error_entries[i];
  89.         printf("%d: %s [%s]\n", entry->num, av_err2str(entry->num), entry->tag);
  90.     }
  91.  
  92.     for (i = 0; i < 256; i++) {
  93.         printf("%d: %s\n", -i, av_err2str(-i));
  94.     }
  95.  
  96.     return 0;
  97. }
  98.  
  99. #endif /* TEST */
  100.