1 files changed, 27 insertions, 0 deletions
diff --git a/lib/libc/string/strstr.c b/lib/libc/string/strstr.c
new file mode 100644
index 00000000..c3e2d5dd
--- /dev/null
+++ b/lib/libc/string/strstr.c
@@ -0,0 +1,27 @@
+#include <stddef.h>
+
+char *strstr(const char *s1, const char *s2)
+{
+	const char *p = s1;
+	const char *q = s2;
+
+	if (*q == '\0')
+		return (char *)p;
+
+	while (*p != '\0') {
+		const char *pp = p;
+		const char *qq = q;
+
+		while (*pp == *qq && *pp != '\0') {
+			pp++;
+			qq++;
+		}
+
+		if (*qq == '\0')
+			return (char *)p;
+
+		p++;
+	}
+
+	return NULL;
+}