getopt_long_only -- parse command line options


#define _GNU_SOURCE
#include <getopt.h>

int getopt_long_only(int argc, char * const argv[], const char *opstring, (const struct option *longopts), int *longindex);


getopt_long_only is like getopt_long, but "-" as well as "--" can indicate a long option. If an option that starts with "-" (not "--") doesn't match a long option, but does match a short option, it is parsed as a short option instead.

Return Value

getopt_long_only returns the option character if the option was found successfully, or ":" if there was a missing parameter for one of the options, or "?" for an unknown option character, or -1 for the end of the option list.

getopt_long_only also returns the option character when a short option is recognized. For a long option, they return val if flag is NULL, and 0 otherwise. Error and -1 returns are the same as for getopt, plus "?" for an ambiguous match or an extraneous parameter.