1 files changed, 41 insertions, 0 deletions
diff --git a/streqlen.c b/streqlen.c
new file mode 100644
index 0000000..d563ecc
--- /dev/null
+++ b/streqlen.c
@@ -0,0 +1,41 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+size_t
+libsimple_streqlen(const char *a, const char *b)
+{
+	size_t i = 0;
+	for (; a[i] == b[i] && a[i]; i++);
+	return i;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+	char s[] = "abcdefgh", t[] = "abcdefgh";
+	size_t i, j;
+	assert(libsimple_streqlen("", "") == 0);
+	assert(libsimple_streqlen("x", "") == 0);
+	assert(libsimple_streqlen("x", "y") == 0);
+	assert(libsimple_streqlen("", "y") == 0);
+	for (i = 0; i <= 8; i++) {
+		for (j = 0; j <= 8; j++) {
+			assert(libsimple_streqlen(&s[i], &t[j]) == (i == j ? 8 - i : 0));
+			s[i] = t[j] = '\0';
+			assert(libsimple_streqlen(s, t) == (i < j ? i : j));
+			s[i] = "abcdefgh"[i];
+			t[j] = "abcdefgh"[j];
+		}
+	}
+	assert(libsimple_streqlen("abc", "ABC") == 0);
+	assert(libsimple_streqlen("123", "123") == 3);
+	return 0;
+}
+
+#endif