From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/missing/strstr.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 jni/ruby/missing/strstr.c

(limited to 'jni/ruby/missing/strstr.c')

diff --git a/jni/ruby/missing/strstr.c b/jni/ruby/missing/strstr.c
new file mode 100644
index 0000000..e6613c5
--- /dev/null
+++ b/jni/ruby/missing/strstr.c
@@ -0,0 +1,29 @@
+/* public domain rewrite of strstr(3) */
+
+#include "ruby/missing.h"
+
+size_t strlen(const char*);
+
+char *
+strstr(const char *haystack, const char *needle)
+{
+    const char *hend;
+    const char *a, *b;
+
+    if (*needle == 0) return (char *)haystack;
+    hend = haystack + strlen(haystack) - strlen(needle) + 1;
+    while (haystack < hend) {
+	if (*haystack == *needle) {
+	    a = haystack;
+	    b = needle;
+	    for (;;) {
+		if (*b == 0) return (char *)haystack;
+		if (*a++ != *b++) {
+		    break;
+		}
+	    }
+	}
+	haystack++;
+    }
+    return 0;
+}
-- 
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