text: /*
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #undef _GNU_SOURCE
  #define _XOPEN_SOURCE 600 /* XSI-compliant version of strerror_r */
  #include "avutil.h"
  #include "avstring.h"
  #include "common.h"
  
  struct error_entry {
      int num;
      const char *tag;
      const char *str;
  };
  
  #define ERROR_TAG(tag) AVERROR_##tag, #tag
  static const struct error_entry error_entries[] = {
      { ERROR_TAG(BSF_NOT_FOUND),      "Bitstream filter not found"                     },
      { ERROR_TAG(BUG),                "Internal bug, should not have happened"         },
      { ERROR_TAG(BUG2),               "Internal bug, should not have happened"         },
      { ERROR_TAG(BUFFER_TOO_SMALL),   "Buffer too small"                               },
      { ERROR_TAG(DECODER_NOT_FOUND),  "Decoder not found"                              },
      { ERROR_TAG(DEMUXER_NOT_FOUND),  "Demuxer not found"                              },
      { ERROR_TAG(ENCODER_NOT_FOUND),  "Encoder not found"                              },
      { ERROR_TAG(EOF),                "End of file"                                    },
      { ERROR_TAG(EXIT),               "Immediate exit requested"                       },
      { ERROR_TAG(EXTERNAL),           "Generic error in an external library"           },
      { ERROR_TAG(FILTER_NOT_FOUND),   "Filter not found"                               },
      { ERROR_TAG(INVALIDDATA),        "Invalid data found when processing input"       },
      { ERROR_TAG(MUXER_NOT_FOUND),    "Muxer not found"                                },
      { ERROR_TAG(OPTION_NOT_FOUND),   "Option not found"                               },
      { ERROR_TAG(PATCHWELCOME),       "Not yet implemented in FFmpeg, patches welcome" },
      { ERROR_TAG(PROTOCOL_NOT_FOUND), "Protocol not found"                             },
      { ERROR_TAG(STREAM_NOT_FOUND),   "Stream not found"                               },
      { ERROR_TAG(UNKNOWN),            "Unknown error occurred"                         },
      { ERROR_TAG(EXPERIMENTAL),       "Experimental feature"                           },
  };
  
  int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
  {
      int ret = 0, i;
      const struct error_entry *entry = NULL;
  
      for (i = 0; i < FF_ARRAY_ELEMS(error_entries); i++) {
          if (errnum == error_entries[i].num) {
              entry = &error_entries[i];
              break;
          }
      }
      if (entry) {
          av_strlcpy(errbuf, entry->str, errbuf_size);
      } else {
  #if HAVE_STRERROR_R
          ret = AVERROR((int)strerror_r(AVUNERROR(errnum), errbuf, errbuf_size));
  #else
          ret = -1;
  #endif
          if (ret < 0)
              snprintf(errbuf, errbuf_size, "Error number %d occurred", errnum);
      }
  
      return ret;
  }
  
  #ifdef TEST
  
  #undef printf
  
  int main(void)
  {
      int i;
  
      for (i = 0; i < FF_ARRAY_ELEMS(error_entries); i++) {
          const struct error_entry *entry = &error_entries[i];
          printf("%d: %s [%s]\n", entry->num, av_err2str(entry->num), entry->tag);
      }
  
      for (i = 0; i < 256; i++) {
          printf("%d: %s\n", -i, av_err2str(-i));
      }
  
      return 0;
  }
  
  #endif /* TEST */
  