cmdutils.c

   1 /*
   2  * Various utilities for command line tools
   3  * Copyright (c) 2000-2003 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25
  26 #include "avformat.h"
  27 #include "cmdutils.h"
  28 #include "avstring.h"
  29
  30 #undef exit
  31
  32 void show_help_options(const OptionDef *options, const char *msg, int mask, int value)
  33 {
  34     const OptionDef *po;
  35     int first;
  36
  37     first = 1;
  38     for(po = options; po->name != NULL; po++) {
  39         char buf[64];
  40         if ((po->flags & mask) == value) {
  41             if (first) {
  42                 printf("%s", msg);
  43                 first = 0;
  44             }
  45             av_strlcpy(buf, po->name, sizeof(buf));
  46             if (po->flags & HAS_ARG) {
  47                 av_strlcat(buf, " ", sizeof(buf));
  48                 av_strlcat(buf, po->argname, sizeof(buf));
  49             }
  50             printf("-%-17s  %s\n", buf, po->help);
  51         }
  52     }
  53 }
  54
  55 static const OptionDef* find_option(const OptionDef *po, const char *name){
  56     while (po->name != NULL) {
  57         if (!strcmp(name, po->name))
  58             break;
  59         po++;
  60     }
  61     return po;
  62 }
  63
  64 void parse_options(int argc, char **argv, const OptionDef *options)
  65 {
  66     const char *opt, *arg;
  67     int optindex, handleoptions=1;
  68     const OptionDef *po;
  69
  70     /* parse options */
  71     optindex = 1;
  72     while (optindex < argc) {
  73         opt = argv[optindex++];
  74
  75         if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
  76           if (opt[1] == '-' && opt[2] == '\0') {
  77             handleoptions = 0;
  78             continue;
  79           }
  80             po= find_option(options, opt + 1);
  81             if (!po->name)
  82                 po= find_option(options, "default");
  83             if (!po->name) {
  84 unknown_opt:
  85                 fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
  86                 exit(1);
  87             }
  88             arg = NULL;
  89             if (po->flags & HAS_ARG) {
  90                 arg = argv[optindex++];
  91                 if (!arg) {
  92                     fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
  93                     exit(1);
  94                 }
  95             }
  96             if (po->flags & OPT_STRING) {
  97                 char *str;
  98                 str = av_strdup(arg);
  99                 *po->u.str_arg = str;
 100             } else if (po->flags & OPT_BOOL) {
 101                 *po->u.int_arg = 1;
 102             } else if (po->flags & OPT_INT) {
 103                 *po->u.int_arg = atoi(arg);
 104             } else if (po->flags & OPT_INT64) {
 105                 *po->u.int64_arg = strtoll(arg, (char **)NULL, 10);
 106             } else if (po->flags & OPT_FLOAT) {
 107                 *po->u.float_arg = atof(arg);
 108             } else if (po->flags & OPT_FUNC2) {
 109                 if(po->u.func2_arg(opt+1, arg)<0)
 110                     goto unknown_opt;
 111             } else {
 112                 po->u.func_arg(arg);
 113             }
 114         } else {
 115             parse_arg_file(opt);
 116         }
 117     }
 118 }
 119
 120 void print_error(const char *filename, int err)
 121 {
 122     switch(err) {
 123     case AVERROR_NUMEXPECTED:
 124         fprintf(stderr, "%s: Incorrect image filename syntax.\n"
 125                 "Use '%%d' to specify the image number:\n"
 126                 "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
 127                 "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
 128                 filename);
 129         break;
 130     case AVERROR_INVALIDDATA:
 131         fprintf(stderr, "%s: Error while parsing header\n", filename);
 132         break;
 133     case AVERROR_NOFMT:
 134         fprintf(stderr, "%s: Unknown format\n", filename);
 135         break;
 136     case AVERROR(EIO):
 137         fprintf(stderr, "%s: I/O error occured\n"
 138                 "Usually that means that input file is truncated and/or corrupted.\n",
 139                 filename);
 140         break;
 141     case AVERROR(ENOMEM):
 142         fprintf(stderr, "%s: memory allocation error occured\n", filename);
 143         break;
 144     case AVERROR(ENOENT):
 145         fprintf(stderr, "%s: no such file or directory\n", filename);
 146         break;
 147     default:
 148         fprintf(stderr, "%s: Error while opening file\n", filename);
 149         break;
 150     }
 151 }