Command Line Argument Processing
This is another in my series of "simple programming techniques I don't want to keep reinventing."
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char**argv)
{
opterr = 0; /* disable auto error reporting */
char opt = 0;
/* These copies are needed because optind and optarg aren't
necessarily visible to debuggers, and you often want them. */
int myoptind = 1;
char* myoptarg = 0;
int a = 0;
const char* b = 0;
while (((char) -1) != (opt = (char) getopt(argc, argv, "ab:"))){
myoptind = optind;
myoptarg = optarg;
switch(opt){
case 'a':
a = 1;
break;
case 'b':
b = myoptarg;
break;
default:
{
char erropt = optopt;
fprintf(stdout, "unrecognized option '%c'\n", erropt);
}
break;
}
}
if (myoptind < argc){
fprintf(stdout, "unused arguments:");
while (myoptind < argc){
fprintf(stdout, " %s", argv[myoptind++]);
}
fprintf(stdout, "\n");
}
fprintf(stdout, "a: %d\nb: %s\n", a, b);
fflush(stdout);
return 0;
}
