/*
  * 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

 #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(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 */