Function xo_parse_args

tools/libxo/libxo/libxo.c:8139–8225

* Parse any libxo-specific options from the command line, removing them * so the main() argument parsing won't see them. We return the new value * for argc or -1 for error. If an error occurred, the program should * exit. A suitable error message has already been displayed. */

 * exit.  A suitable error message has already been displayed.
 */
int
xo_parse_args (int argc, char **argv)
{
    static char libxo_opt[] = "--libxo";
    char *cp;
    int i, save;

    /*
     * If xo_set_program has always been called, we honor that value
     */
    if (xo_program == NULL) {
	/* Save our program name for xo_err and friends */
	xo_program = argv[0];
	cp = strrchr(xo_program, '/');
	if (cp)
	    xo_program = ++cp;
	else
	    cp = argv[0];		/* Reset to front of string */

	/*
	 * GNU libtool add an annoying ".test" as the program
	 * extension; we remove it.  libtool also adds a "lt-" prefix
	 * that we cannot remove.
	 */
	size_t len = strlen(xo_program);
	static const char gnu_ext[] = ".test";
	if (len >= sizeof(gnu_ext)) {
	    cp += len + 1 - sizeof(gnu_ext);
	    if (xo_streq(cp, gnu_ext))
		*cp = '\0';
	}
    }

    xo_handle_t *xop = xo_default(NULL);

    for (save = i = 1; i < argc; i++) {
	if (argv[i] == NULL
	    || strncmp(argv[i], libxo_opt, sizeof(libxo_opt) - 1) != 0) {
	    if (save != i)
		argv[save] = argv[i];
	    save += 1;
	    continue;
	}

	cp = argv[i] + sizeof(libxo_opt) - 1;
	if (*cp == '\0') {
	    cp = argv[++i];
	    if (cp == NULL) {
		xo_warnx("missing libxo option");
		return -1;
	    }
		
	    if (xo_set_options(xop, cp) < 0)
		return -1;
	} else if (*cp == ':') {
	    if (xo_set_options(xop, cp) < 0)
		return -1;