1 files changed, 24 insertions, 0 deletions
diff --git a/src/string/strcat.c b/src/string/strcat.c
new file mode 100644
index 00000000..9526cd59
--- /dev/null
+++ b/src/string/strcat.c
@@ -0,0 +1,24 @@
+#include <string.h>
+#include "nonstd/assert.h"
+
+/** concatenate strings **/
+char * strcat(char * restrict s1, const char * restrict s2)
+{
+	ASSERT_NONNULL(s1);
+	ASSERT_NONNULL(s2);
+	ASSERT_NOOVERLAP(s1, s2, strlen(s1) + strlen(s2));
+
+	/*
+	RETURN_ALWAYS(ARGUMENT(s1));
+	*/
+	return strncat(s1, s2, strlen(s2));
+}
+
+/***
+appends a copy of the string at ARGUMENT(s2) to the end of
+the string at ARGUMENT(s1). The first byte of ARGUMENT(s2) will overwrite the terminating
+null character of ARGUMENT(s1).
+***/
+/*
+STDC(1)
+*/