Imported Upstream version 93u+upstream

1 files changed, 57 insertions, 0 deletions

diff --git a/src/lib/libast/string/strsearch.c b/src/lib/libast/string/strsearch.c
new file mode 100644
index 0000000..56d78fc
--- /dev/null
+++ b/src/lib/libast/string/strsearch.c
@@ -0,0 +1,57 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * Glenn Fowler
+ * AT&T Research
+ */
+
+#include <ast.h>
+
+/*
+ * return a pointer to the element matching
+ * name in the (*comparf*)() sorted tab of num elements of
+ * size siz where the first member of each
+ * element is a char*
+ *
+ * 0 returned if name not found
+ */
+
+void*
+strsearch(const void* tab, size_t num, size_t siz, Strcmp_f comparf, const char* name, void* context)
+{
+	register char*		lo = (char*)tab;
+	register char*		hi = lo + (num - 1) * siz;
+	register char*		mid;
+	register int		v;
+
+	while (lo <= hi)
+	{
+		mid = lo + (((hi - lo) / siz) / 2) * siz;
+		if (!(v = context ? (*(Strcmp_context_f)comparf)(name, *((char**)mid), context) : (*comparf)(name, *((char**)mid))))
+			return (void*)mid;
+		else if (v > 0)
+			lo = mid + siz;
+		else hi = mid - siz;
+	}
+	return 0;
+}