Function gmt_first_modifier

src/gmt_support.c:14603–14637

}

char *gmt_first_modifier (struct GMT_CTRL *GMT, char *string, const char *sep) {
	/* Return pointer to the first modifier +<char>, with three conditions:
	 * 1. <char> must be one of the letters in sep,
	 * 2. We must not be inside quoted text, i.e., "my +shit title",
	 * 3. The + must not be escaped, i.e., +t"My \+shit text"
	 *
	 * If the modifier is not found we returns NULL.  This is not an error
	 * but means we did not find anything.
	 */
	size_t len, k = 0;
	bool inside_quote = false, done = false;
	if (sep == NULL) {
		GMT_Report (GMT->parent, GMT_MSG_ERROR, "gmt_first_modifier: No separation codes given\n");
		return NULL;
	}

	if (string == NULL) return NULL;
	len = strlen (string);
	inside_quote = (string[0] == '\"' || string[0] == '\'');
	while (!done) {
		while (k < len && (inside_quote || string[k] != '+' || (k > 0 && string[k-1] == '\\'))) {
			k++;
			if (string[k] == '\"' || string[k] == '\'') inside_quote = !inside_quote;
		}
		k++;	/* Advance to character after the + */
		if (k >= len) return NULL;
		if (strchr (sep, string[k]))
			done = true;
		else {
			if (isalpha (string[k])) GMT_Report (GMT->parent, GMT_MSG_WARNING, "Modifier +%c detected but not a valid modifier! - ignored\n", string[k]);
			return NULL;
		}
	}
	return (k > 0 && k < len) ? &string[k-1] : NULL;
}

char *gmtlib_last_valid_file_modifier (struct GMTAPI_CTRL *API, char* filename, const char *mods) {
	/* A filename make have sequences that could look like a GMT modifier but is actually just part