134 lines
2.8 KiB
C
134 lines
2.8 KiB
C
/* args.h - argument handling
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Copyright (C) 2012 Connor Olding
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ARGS_H_
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#define ARGS_H_
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#include <stdio.h>
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#include <string.h>
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/* interface */
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extern char args_info[];
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extern char args_usage[];
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extern char args_help_suffix[];
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extern const int args_switch_count;
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extern char* args_switches[];
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extern void (*args_functions[])();
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void args_handle(int argc, char* argv[]);
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char* args_poll();
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void args_print_help();
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/* implemenation */
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static const int args_columns = 3;
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static char* args_program_name = NULL;
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static int args_argc = 0;
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static char** args_argv = NULL;
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static int args_current = 0;
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static int args_previous = 0;
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static void args_print_info()
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{
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printf(args_info);
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}
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static void args_print_usage()
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{
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printf(args_usage, args_program_name);
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}
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static void args_print_switches()
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{
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int i;
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for (i = 0; i < args_switch_count * args_columns; i += args_columns) {
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printf(" %s, %s %s\n",
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args_switches[i],
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args_switches[i + 1],
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args_switches[i + 2]);
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}
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printf(args_help_suffix);
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}
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void args_print_help()
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{
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args_print_info();
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puts("");
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args_print_switches();
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exit(0);
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}
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static int args_get_index(char* name)
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{
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int i;
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for (i = 0; i < args_switch_count * args_columns; i++) {
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if (i % args_columns == args_columns - 1)
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continue; /* skip checking the description column */
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if (!strcmp(args_switches[i], name)) {
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return i / args_columns;
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}
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}
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return -1;
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}
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char* args_poll()
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{
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if (args_current >= args_argc) {
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if (args_current - 1 == args_previous)
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fprintf(stderr, "%s requires an argument.\n",
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args_argv[args_previous]);
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else
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fprintf(stderr, "%s requires another argument.\n",
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args_argv[args_previous]);
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args_print_usage();
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exit(1);
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}
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args_current++;
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return args_argv[args_current - 1];
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}
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void args_handle(int argc, char** argv)
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{
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args_argc = argc;
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args_argv = argv;
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args_current = 0;
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args_program_name = args_poll();
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while (args_current < args_argc) {
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char* name;
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int index;
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args_previous = args_current;
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name = args_poll();
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index = args_get_index(name);
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if (index < 0) {
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fprintf(stderr, "Unknown option: %s\n", name);
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args_print_usage();
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exit(1);
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}
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args_functions[index]();
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}
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}
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#endif
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