error.c

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/*
 * 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(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 */