improve broken shell detection, and give a better error message
[libav.git] / 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;
63 const OptionDef *po;
64
65 /* parse options */
66 optindex = 1;
67 while (optindex < argc) {
68 opt = argv[optindex++];
69
70 if (opt[0] == '-' && opt[1] != '\0') {
71 po= find_option(options, opt + 1);
72 if (!po->name)
73 po= find_option(options, "default");
74 if (!po->name) {
75 unknown_opt:
76 fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], opt);
77 exit(1);
78 }
79 arg = NULL;
80 if (po->flags & HAS_ARG) {
81 arg = argv[optindex++];
82 if (!arg) {
83 fprintf(stderr, "%s: missing argument for option '%s'\n", argv[0], opt);
84 exit(1);
85 }
86 }
87 if (po->flags & OPT_STRING) {
88 char *str;
89 str = av_strdup(arg);
90 *po->u.str_arg = str;
91 } else if (po->flags & OPT_BOOL) {
92 *po->u.int_arg = 1;
93 } else if (po->flags & OPT_INT) {
94 *po->u.int_arg = atoi(arg);
95 } else if (po->flags & OPT_FLOAT) {
96 *po->u.float_arg = atof(arg);
97 } else if (po->flags & OPT_FUNC2) {
98 if(po->u.func2_arg(opt+1, arg)<0)
99 goto unknown_opt;
100 } else {
101 po->u.func_arg(arg);
102 }
103 } else {
104 parse_arg_file(opt);
105 }
106 }
107 }
108
109 void print_error(const char *filename, int err)
110 {
111 switch(err) {
112 case AVERROR_NUMEXPECTED:
113 fprintf(stderr, "%s: Incorrect image filename syntax.\n"
114 "Use '%%d' to specify the image number:\n"
115 " for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
116 " for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n",
117 filename);
118 break;
119 case AVERROR_INVALIDDATA:
120 fprintf(stderr, "%s: Error while parsing header\n", filename);
121 break;
122 case AVERROR_NOFMT:
123 fprintf(stderr, "%s: Unknown format\n", filename);
124 break;
125 case AVERROR_IO:
126 fprintf(stderr, "%s: I/O error occured\n"
127 "Usually that means that input file is truncated and/or corrupted.\n",
128 filename);
129 break;
130 case AVERROR_NOMEM:
131 fprintf(stderr, "%s: memory allocation error occured\n", filename);
132 break;
133 default:
134 fprintf(stderr, "%s: Error while opening file\n", filename);
135 break;
136 }
137 }