static int parse_opts(char * opts, opt_struct ** result)
{
	opt_struct * paras = NULL;
	unsigned int i, count = 0;

	for (i = 0; i < strlen(opts); i++) {
		if ((opts[i] >= 48 && opts[i] <= 57) ||
			(opts[i] >= 65 && opts[i] <= 90) ||
			(opts[i] >= 97 && opts[i] <= 122)
		) {
			count++;
		}
	}

	paras = safe_emalloc(sizeof(opt_struct), count, 0);
	memset(paras, 0, sizeof(opt_struct) * count);
	*result = paras;
	while ( (*opts >= 48 && *opts <= 57) || /* 0 - 9 */
			(*opts >= 65 && *opts <= 90) || /* A - Z */
			(*opts >= 97 && *opts <= 122)   /* a - z */
	) {
		paras->opt_char = *opts;
		paras->need_param = (*(++opts) == ':') ? 1 : 0;
		paras->opt_name = NULL;
		if (paras->need_param == 1) {
			opts++;
			if (*opts == ':') {
				paras->need_param++;
				opts++;
			}
		}
		paras++;
	}
	return count;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.