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-rw-r--r--src/libutf/runestrstr.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/src/libutf/runestrstr.c b/src/libutf/runestrstr.c
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+++ b/src/libutf/runestrstr.c
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+/*
+ * The authors of this software are Rob Pike and Ken Thompson.
+ * Copyright (c) 2002 by Lucent Technologies.
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose without fee is hereby granted, provided that this entire notice
+ * is included in all copies of any software which is or includes a copy
+ * or modification of this software and in all copies of the supporting
+ * documentation for such software.
+ * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
+ * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
+ * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
+ */
+#include <stdarg.h>
+#include <string.h>
+#include "utf.h"
+#include "utfdef.h"
+
+/*
+ * Return pointer to first occurrence of s2 in s1,
+ * 0 if none
+ */
+Rune*
+runestrstr(Rune *s1, Rune *s2)
+{
+ Rune *p, *pa, *pb;
+ int c0, c;
+
+ c0 = *s2;
+ if(c0 == 0)
+ return s1;
+ s2++;
+ for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) {
+ pa = p;
+ for(pb=s2;; pb++) {
+ c = *pb;
+ if(c == 0)
+ return p;
+ if(c != *++pa)
+ break;
+ }
+ }
+ return 0;
+}