Mega Code Archive
Getopt example
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#include <stdio.h>
#include <getopt.h>
#define PACKAGE "getoptex"
#define VERSION "0.0.1"
void print_help(int exval);
int main(int argc, char *argv[]) {
int opt;
/*
// no arguments given
*/
if(argc == 1) {
fprintf(stderr, "This program needs arguments....\n\n");
print_help(1);
}
while((opt = getopt(argc, argv, "hVvf:o:")) != -1) {
switch(opt) {
case 'h':
print_help(0);
break;
case 'V':
printf("%s %s\n\n", PACKAGE, VERSION);
exit(0);
break;
case 'v':
printf("%s: Verbose option is set `%c'\n", PACKAGE, optopt);
break;
case 'f':
printf("%s: Filename %s\n", PACKAGE, optarg);
break;
case 'o':
printf("Output: %s\n", optarg);
break;
case ':':
fprintf(stderr, "%s: Error - Option `%c' needs a value\n\n", PACKAGE, optopt);
print_help(1);
break;
case '?':
fprintf(stderr, "%s: Error - No such option: `%c'\n\n", PACKAGE, optopt);
print_help(1);
}
}
/*
// print all remaining options
*/
for(; optind < argc; optind++)
printf("argument: %s\n", argv[optind]);
return 0;
}
void print_help(int exval) {
printf("%s,%s show working getopt example\n", PACKAGE, VERSION);
printf("%s [-h] [-V] [-f FILE] [-o FILE]\n\n", PACKAGE);
printf(" -h print this help and exit\n");
printf(" -V print version and exit\n\n");
printf(" -v set verbose flag\n");
printf(" -f FILE set intput file\n");
printf(" -o FILE set output file\n\n");
exit(exval);
}
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