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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #define HAVE_AV_CONFIG_H
  20 #include "avformat.h"
  21 #include "common.h"
  22
  23 #include "cmdutils.h"
  24
  25 void show_help_options(const OptionDef *options, const char *msg, int mask, int value)
  26 {
  27     const OptionDef *po;
  28     int first;
  29
  30     first = 1;
  31     for(po = options; po->name != NULL; po++) {
  32         char buf[64];
  33         if ((po->flags & mask) == value) {
  34             if (first) {
  35                 printf("%s", msg);
  36                 first = 0;
  37             }
  38             pstrcpy(buf, sizeof(buf), po->name);
  39             if (po->flags & HAS_ARG) {
  40                 pstrcat(buf, sizeof(buf), " ");
  41                 pstrcat(buf, sizeof(buf), po->argname);
  42             }
  43             printf("-%-17s  %s\n", buf, po->help);
  44         }
  45     }
  46 }
  47
  48 static const OptionDef* find_option(const OptionDef *po, const char *name){
  49     while (po->name != NULL) {
  50         if (!strcmp(name, po->name))
  51             break;
  52         po++;
  53     }
  54     return po;
  55 }
  56
  57 void parse_options(int argc, char **argv, const OptionDef *options)
  58 {
  59     const char *opt, *arg;
  60     int optindex;
  61     const OptionDef *po;
  62
  63     /* parse options */
  64     optindex = 1;
  65     while (optindex < argc) {
  66         opt = argv[optindex++];
  67
  68         if (opt[0] == '-' && opt[1] != '\0') {
  69             po= find_option(options, opt + 1);
  70             if (!po->name)
  71                 po= find_option(options, "default");
  72             if (!po->name) {
  73 unknown_opt:
  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 = av_strdup(arg);
  88                 *po->u.str_arg = str;
  89             } else if (po->flags & OPT_BOOL) {
  90                 *po->u.int_arg = 1;
  91             } else if (po->flags & OPT_INT) {
  92                 *po->u.int_arg = atoi(arg);
  93             } else if (po->flags & OPT_FLOAT) {
  94                 *po->u.float_arg = atof(arg);
  95             } else if (po->flags & OPT_FUNC2) {
  96                 if(po->u.func2_arg(opt+1, arg)<0)
  97                     goto unknown_opt;
  98             } else {
  99                 po->u.func_arg(arg);
 100             }
 101         } else {
 102             parse_arg_file(opt);
 103         }
 104     }
 105 }
 106
 107 void print_error(const char *filename, int err)
 108 {
 109     switch(err) {
 110     case AVERROR_NUMEXPECTED:
 111         fprintf(stderr, "%s: Incorrect image filename syntax.\n"
 112                 "Use '%%d' to specify the image number:\n"
 113                 "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
 114                 "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
 115                 filename);
 116         break;
 117     case AVERROR_INVALIDDATA:
 118         fprintf(stderr, "%s: Error while parsing header\n", filename);
 119         break;
 120     case AVERROR_NOFMT:
 121         fprintf(stderr, "%s: Unknown format\n", filename);
 122         break;
 123     case AVERROR_IO:
 124         fprintf(stderr, "%s: I/O error occured\n"
 125                 "Usually that means that input file is truncated and/or corrupted.\n",
 126                 filename);
 127         break;
 128     case AVERROR_NOMEM:
 129         fprintf(stderr, "%s: memory allocation error occured\n", filename);
 130         break;
 131     default:
 132         fprintf(stderr, "%s: Error while opening file\n", filename);
 133         break;
 134     }
 135 }