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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int optind = 1;
char *optarg = (char *)NULL;
int getopt (int argc, char **argv, char *optstring)
{
int cur_option; /* Current option */
char *cp; /* Character pointer */
static int GetOptionPosition = 1;
if (GetOptionPosition == 1)
{
/* Check for out of range, correct start character and not single */
if ((optind >= argc) || (*argv[optind] != '-') || !argv[optind][1])
return EOF;
if (!strcmp (argv[optind], "--"))
return EOF;
}
/* Get the current character from the current argument vector */
cur_option = argv[optind][GetOptionPosition];
/* Validate it */
if ((cur_option == ':') ||
((cp = strchr (optstring, cur_option)) == (char *)NULL))
{
/* Move to the next offset */
if (!argv[optind][++GetOptionPosition])
{
optind++;
GetOptionPosition = 1;
}
return '?';
}
/* Parameters following ? */
optarg = (char *)NULL;
if (*(++cp) == ':')
{
if (argv[optind][GetOptionPosition + 1])
optarg = &argv[optind++][GetOptionPosition + 1];
else if (++optind >= argc)
{
optarg = (char *)NULL;
GetOptionPosition = 1;
return '?';
}
else
optarg = argv[optind++];
GetOptionPosition = 1;
}
else if (!argv[optind][++GetOptionPosition])
{
GetOptionPosition = 1;
optind++;
}
return cur_option;
}
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