lib/strutils: optimalize {starts,ends}with()

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 40 insertions, 3 deletions

diff --git a/include/strutils.h b/include/strutils.h
index 8d8a6e46c..c7fe42a63 100644
--- a/include/strutils.h
+++ b/include/strutils.h
@@ -102,8 +102,45 @@ extern int parse_range(const char *str, int *lower, int *upper, int def);
 
 extern int streq_except_trailing_slash(const char *s1, const char *s2);
 
-extern char *startswith(const char *s, const char *prefix);
-extern char *startswith_no_case(const char *s, const char *prefix);
-extern char *endswith(const char *s, const char *postfix);
+/*
+ * Match string beginning.
+ */
+static inline const char *startswith(const char *s, const char *prefix)
+{
+	size_t sz = prefix ? strlen(prefix) : 0;
+
+        if (s && sz && strncmp(s, prefix, sz) == 0)
+                return s + sz;
+	return NULL;
+}
+
+/*
+ * Case insensitive match string beginning.
+ */
+static inline const char *startswith_no_case(const char *s, const char *prefix)
+{
+	size_t sz = prefix ? strlen(prefix) : 0;
+
+        if (s && sz && strncasecmp(s, prefix, sz) == 0)
+                return s + sz;
+	return NULL;
+}
+
+/*
+ * Match string ending.
+ */
+static inline const char *endswith(const char *s, const char *postfix)
+{
+	size_t sl = s ? strlen(s) : 0;
+	size_t pl = postfix ? strlen(postfix) : 0;
+
+	if (pl == 0)
+		return (char *)s + sl;
+	if (sl < pl)
+		return NULL;
+	if (memcmp(s + sl - pl, postfix, pl) != 0)
+		return NULL;
+	return (char *)s + sl - pl;
+}
 
 #endif