1 files changed, 21 insertions, 0 deletions
diff --git a/libkern/strstr.c b/libkern/strstr.c
new file mode 100644
index 00000000..b9d8a35e
--- /dev/null
+++ b/libkern/strstr.c
@@ -0,0 +1,21 @@
+#include <lib9.h>
+
+/*
+ * Return pointer to first occurrence of s2 in s1,
+ * 0 if none
+ */
+char*
+strstr(char *s1, char *s2)
+{
+	char *p;
+	int f, n;
+
+	f = s2[0];
+	if(f == 0)
+		return s1;
+	n = strlen(s2);
+	for(p=strchr(s1, f); p; p=strchr(p+1, f))
+		if(strncmp(p, s2, n) == 0)
+			return p;
+	return 0;
+}