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#include <stdio.h>
#include <string.h>
int optind = 1;
int optopt;
char *optarg;
/**
* @brief get command line arguments
* @param[in] argc
* @param[in] argv
* @param[in] opts options available
**/
int getopt(int argc, char **argv, char *opts)
{
static int sp = 1;
register int c;
register char *cp;
if (sp == 1)
if (optind >= argc ||
argv[optind][0] != '-' || argv[optind][1] == '\0')
return -1;
else if (strcmp(argv[optind], "--") == 0)
{
optind++;
return -1;
}
optopt = c = argv[optind][sp];
if (c == ':' || !(cp = strchr(opts, c)))
{
fprintf(stderr, "%c: illegal option -- \n", c);
if (argv[optind][++sp] == '\0')
{
optind++;
sp = 1;
}
return ('?');
}
if (*++cp == ':')
{
if (argv[optind][sp + 1] != '\0')
optarg = &argv[optind++][sp + 1];
else if (++optind >= argc)
{
fprintf(stderr, "%c: option requires an argument -- \n", c);
sp = 1;
return ('?');
} else
optarg = argv[optind++];
sp = 1;
} else
{
if (argv[optind][++sp] == '\0')
{
sp = 1;
optind++;
}
optarg = NULL;
}
return (c);
}
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