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error.c
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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 */