/* string.c - various string-related functions that don't come with string.h */

#include <string.h>
#include <stdbool.h>

/* startswith() - Check if string starts with prefix.
 *
 * Args:
 *     string - String to check (haystack).
 *     prefix - Prefix to check (needle).
 *
 * Returns:
 *     true if 'string' starts with 'prefix', otherwise false.
 */
bool startswith(const char *string, const char *prefix) {
	if ((string == NULL) || (prefix == NULL)) {
		return false;
	}

	while (*prefix) {
		if (*prefix++ != *string++) {
			return false;
		}
	}

	return true;
}

/* endswith() - Check if string ends with suffix.
 *
 * Args:
 *     string - String to check (haystack).
 *     suffix - Suffix to check (needle).
 *
 * Returns:
 *     true if 'string' ends with 'suffix', otherwise false.
 */
bool endswith(const char *string, const char *suffix) {
	size_t string_length;
	size_t suffix_length;

	if ((string == NULL) || (suffix == NULL)) {
		return false;
	}

	string_length = strlen(string);
	suffix_length = strlen(suffix);

	if (suffix_length > string_length) {
		return false;
	}

	return (strncmp(string + string_length - suffix_length,
					suffix,
					suffix_length) == 0) ? true : false;
}