Import sources from 2011-03-30 iso image

1 files changed, 29 insertions, 0 deletions

diff --git a/sys/src/libc/port/strstr.c b/sys/src/libc/port/strstr.c
new file mode 100755
index 000000000..4541ccd04
--- /dev/null
+++ b/sys/src/libc/port/strstr.c
@@ -0,0 +1,29 @@
+#include <u.h>
+#include <libc.h>
+
+/*
+ * Return pointer to first occurrence of s2 in s1,
+ * 0 if none
+ */
+char*
+strstr(char *s1, char *s2)
+{
+	char *p, *pa, *pb;
+	int c0, c;
+
+	c0 = *s2;
+	if(c0 == 0)
+		return s1;
+	s2++;
+	for(p=strchr(s1, c0); p; p=strchr(p+1, c0)) {
+		pa = p;
+		for(pb=s2;; pb++) {
+			c = *pb;
+			if(c == 0)
+				return p;
+			if(c != *++pa)
+				break;
+		}
+	}
+	return 0;
+}