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 #define HAVE_AV_CONFIG_H
  22 #include "avformat.h"
  23 #include "common.h"
  24
  25 #include "cmdutils.h"
  26
  27 void show_help_options(const OptionDef *options, const char *msg, int mask, int value)
  28 {
  29     const OptionDef *po;
  30     int first;
  31
  32     first = 1;
  33     for(po = options; po->name != NULL; po++) {
  34         char buf[64];
  35         if ((po->flags & mask) == value) {
  36             if (first) {
  37                 printf("%s", msg);
  38                 first = 0;
  39             }
  40             pstrcpy(buf, sizeof(buf), po->name);
  41             if (po->flags & HAS_ARG) {
  42                 pstrcat(buf, sizeof(buf), " ");
  43                 pstrcat(buf, sizeof(buf), po->argname);
  44             }
  45             printf("-%-17s  %s\n", buf, po->help);
  46         }
  47     }
  48 }
  49
  50 static const OptionDef* find_option(const OptionDef *po, const char *name){
  51     while (po->name != NULL) {
  52         if (!strcmp(name, po->name))
  53             break;
  54         po++;
  55     }
  56     return po;
  57 }
  58
  59 void parse_options(int argc, char **argv, const OptionDef *options)
  60 {
  61     const char *opt, *arg;
  62     int optindex, handleoptions=1;
  63     const OptionDef *po;
  64
  65     /* parse options */
  66     optindex = 1;
  67     while (optindex < argc) {
  68         opt = argv[optindex++];
  69
  70         if (handleoptions && opt[0] == '-' && opt[1] != '\0') {
  71           if (opt[1] == '-' && opt[2] == '\0') {
  72             handleoptions = 0;
  73             continue;
  74           }
  75             po= find_option(options, opt + 1);
  76             if (!po->name)
  77                 po= find_option(options, "default");
  78             if (!po->name) {
  79 unknown_opt:
  80                 fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
  81                 exit(1);
  82             }
  83             arg = NULL;
  84             if (po->flags & HAS_ARG) {
  85                 arg = argv[optindex++];
  86                 if (!arg) {
  87                     fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
  88                     exit(1);
  89                 }
  90             }
  91             if (po->flags & OPT_STRING) {
  92                 char *str;
  93                 str = av_strdup(arg);
  94                 *po->u.str_arg = str;
  95             } else if (po->flags & OPT_BOOL) {
  96                 *po->u.int_arg = 1;
  97             } else if (po->flags & OPT_INT) {
  98                 *po->u.int_arg = atoi(arg);
  99             } else if (po->flags & OPT_FLOAT) {
 100                 *po->u.float_arg = atof(arg);
 101             } else if (po->flags & OPT_FUNC2) {
 102                 if(po->u.func2_arg(opt+1, arg)<0)
 103                     goto unknown_opt;
 104             } else {
 105                 po->u.func_arg(arg);
 106             }
 107         } else {
 108             parse_arg_file(opt);
 109         }
 110     }
 111 }
 112
 113 void print_error(const char *filename, int err)
 114 {
 115     switch(err) {
 116     case AVERROR_NUMEXPECTED:
 117         fprintf(stderr, "%s: Incorrect image filename syntax.\n"
 118                 "Use '%%d' to specify the image number:\n"
 119                 "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
 120                 "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
 121                 filename);
 122         break;
 123     case AVERROR_INVALIDDATA:
 124         fprintf(stderr, "%s: Error while parsing header\n", filename);
 125         break;
 126     case AVERROR_NOFMT:
 127         fprintf(stderr, "%s: Unknown format\n", filename);
 128         break;
 129     case AVERROR_IO:
 130         fprintf(stderr, "%s: I/O error occured\n"
 131                 "Usually that means that input file is truncated and/or corrupted.\n",
 132                 filename);
 133         break;
 134     case AVERROR_NOMEM:
 135         fprintf(stderr, "%s: memory allocation error occured\n", filename);
 136         break;
 137     default:
 138         fprintf(stderr, "%s: Error while opening file\n", filename);
 139         break;
 140     }
 141 }