initial import

1 files changed, 56 insertions, 0 deletions

diff --git a/src/string.c b/src/string.c
new file mode 100644
index 0000000..805d711
--- /dev/null
+++ b/src/string.c
@@ -0,0 +1,56 @@
+/* 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;
+}