cmdutils.c

   1 /*
   2  * Various utilities for command line tools
   3  * Copyright (c) 2000-2003 Fabrice Bellard
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22
  23 #include "common.h"
  24 #include "avformat.h"
  25
  26 #include "cmdutils.h"
  27
  28 void show_help_options(const OptionDef *options)
  29 {
  30     const OptionDef *po;
  31     int i, expert, first;
  32
  33     printf("Main options are:\n");
  34     for(i=0;i<2;i++) {
  35         first = 1;
  36         for(po = options; po->name != NULL; po++) {
  37             char buf[64];
  38             expert = (po->flags & OPT_EXPERT) != 0;
  39             if (expert == i) {
  40                 if (expert && first) {
  41                     printf("\nAdvanced options are:\n");
  42                     first = 0;
  43                 }
  44                 strcpy(buf, po->name);
  45                 if (po->flags & HAS_ARG) {
  46                     strcat(buf, " ");
  47                     strcat(buf, po->argname);
  48                 }
  49                 printf("-%-17s  %s\n", buf, po->help);
  50             }
  51         }
  52     }
  53 }
  54
  55 void parse_options(int argc, char **argv, const OptionDef *options)
  56 {
  57     const char *opt, *arg;
  58     int optindex;
  59     const OptionDef *po;
  60
  61     /* parse options */
  62     optindex = 1;
  63     while (optindex < argc) {
  64         opt = argv[optindex++];
  65
  66         if (opt[0] == '-' && opt[1] != '\0') {
  67             po = options;
  68             while (po->name != NULL) {
  69                 if (!strcmp(opt + 1, po->name))
  70                     break;
  71                 po++;
  72             }
  73             if (!po->name) {
  74                 fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
  75                 exit(1);
  76             }
  77             arg = NULL;
  78             if (po->flags & HAS_ARG) {
  79                 arg = argv[optindex++];
  80                 if (!arg) {
  81                     fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
  82                     exit(1);
  83                 }
  84             }
  85             if (po->flags & OPT_STRING) {
  86                 char *str;
  87                 str = strdup(arg);
  88                 *po->u.str_arg = str;
  89             } else if (po->flags & OPT_BOOL) {
  90                 *po->u.int_arg = 1;
  91             } else {
  92                 po->u.func_arg(arg);
  93             }
  94         } else {
  95             parse_arg_file(opt);
  96         }
  97     }
  98 }
  99
 100 void print_error(const char *filename, int err)
 101 {
 102     switch(err) {
 103     case AVERROR_NUMEXPECTED:
 104         fprintf(stderr, "%s: Incorrect image filename syntax.\n"
 105                 "Use '%%d' to specify the image number:\n"
 106                 "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
 107                 "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
 108                 filename);
 109         break;
 110     case AVERROR_INVALIDDATA:
 111         fprintf(stderr, "%s: Error while parsing header\n", filename);
 112         break;
 113     case AVERROR_NOFMT:
 114         fprintf(stderr, "%s: Unknown format\n", filename);
 115         break;
 116     default:
 117         fprintf(stderr, "%s: Error while opening file\n", filename);
 118         break;
 119     }
 120 }