getopt()
is not behaving as I expect for short options.
eg: Invoking the below program with a missing parameter:
Valid Case: testopt -d dir -a action -b build
Error Case: testopt -d -a action -b build
This did not throw any error as I was expecting an error message operand missing for -d
My code:
#include <unistd.h>
/* testopt.c */
/* Test program for testing getopt */
int main(int argc, char **argv)
{
int chr;
while ( ( chr = getopt(argc, argv, ":d:a:b:") ) != -1 )
{
switch(chr)
{
case 'a':
printf("Got a...\n");
break;
case 'b':
printf("Got b...\n");
break;
case 'd':
printf("Got d...\n");
break;
case ':':
printf("Missing operand for %c\n", optopt);
break;
case '?':
printf("Unknown option %c\n", optopt);
break;
}
}
printf("execution over\n");
return 0;
}
getopt()
thinks -a
is an argument for -d
, not an option.
Try testopt -a action -b build -d
- it should complain about missing argument.
You need to check for -d
option (and all other options) that optarg
has valid value - the one without dash in the beginning.