Initial revision

lang/cem/libcc.ansi/stdlib/bsearch.c

@@ -0,0 +1,28 @@
+/*
+ * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
+ * See the copyright notice in the ACK home directory, in the file "Copyright".
+ */
+/* $Header$ */
+
+#include	<stdlib.h>
+
+void *
+bsearch(register const void *key, register const void *base,
+	register size_t nmemb, register size_t size,
+	int (*compar)(const void *, const void *))
+{
+	register void *mid_point;
+	register int  cmp;
+
+	while (nmemb > 0) {
+		mid_point = base + size * (nmemb >> 1);
+		if ((cmp = (*compar)(key, mid_point)) == 0)
+			return(mid_point);
+		if (cmp >= 0) {
+			base  = mid_point + size;
+			nmemb = (nmemb - 1) >> 1;
+		} else
+			nmemb >>= 1;
+	}
+	return((void *)NULL);
+}