2 * Copyright (C) 2006-2007 Michael Buesch <mb@bu3sch.de>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
31 static int do_cmp_arg(char **argv, int *pos,
38 size_t arg_len, template_len;
41 next_arg = argv[*pos + 1];
42 arg_len = strlen(arg);
43 template_len = strlen(template);
46 /* Maybe we have a merged parameter here.
47 * A merged parameter is "-pfoobar" for example.
49 if (allow_merged && arg_len > template_len) {
50 if (memcmp(arg, template, template_len) == 0) {
51 *param = arg + template_len;
55 } else if (arg_len != template_len)
59 if (strcmp(arg, template) == 0) {
61 /* Skip the parameter on the next iteration. */
64 fprintf(stderr, "%s needs a parameter\n", arg);
74 /* Simple and lean command line argument parsing. */
75 static int cmp_arg(char **argv, int *pos,
76 const char *long_template,
77 const char *short_template,
83 err = do_cmp_arg(argv, pos, long_template, 0, param);
84 if (err == ARG_MATCH || err == ARG_ERROR)
89 err = do_cmp_arg(argv, pos, short_template, 1, param);
93 static void usage(int argc, char **argv)
95 fprintf(stderr, "Usage: %s INPUT_FILE OUTPUT_FILE [OPTIONS]\n", argv[0]);
96 fprintf(stderr, " -h|--help Print this help\n");
97 fprintf(stderr, " -d|--debug Print verbose debugging info\n");
98 fprintf(stderr, " Repeat for more verbose debugging\n");
101 int parse_args(int argc, char **argv)
108 infile_name = argv[1];
109 outfile_name = argv[2];
111 for (i = 3; i < argc; i++) {
112 if ((res = cmp_arg(argv, &i, "--help", "-h", 0)) == ARG_MATCH) {
115 } else if ((res = cmp_arg(argv, &i, "--debug", "-d", 0)) == ARG_MATCH) {
118 fprintf(stderr, "Unrecognized argument: %s\n", argv[i]);
128 int open_input_file(void)
133 if (strcmp(infile_name, "-") == 0) {
134 /* infile == stdin */
137 fd = open(infile_name, O_RDONLY);
139 fprintf(stderr, "Could not open INPUT_FILE %s\n",
143 err = dup2(fd, STDIN_FILENO);
145 fprintf(stderr, "Could not dup INPUT_FILE %s "
146 "to STDIN\n", infile_name);
156 void close_input_file(void)
158 if (strcmp(infile_name, "-") != 0)