Imported Upstream version 93u+upstream

1 files changed, 57 insertions, 0 deletions

diff --git a/src/lib/libast/string/strsort.c b/src/lib/libast/string/strsort.c
new file mode 100644
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+++ b/src/lib/libast/string/strsort.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
+/*
+ *  strsort - sort an array pointers using fn
+ *
+ *	fn follows strcmp(3) conventions
+ *
+ *   David Korn
+ *   AT&T Bell Laboratories
+ *
+ *  derived from Bourne Shell
+ */
+
+#include <ast.h>
+
+void
+strsort(char** argv, int n, int(*fn)(const char*, const char*))
+{
+	register int 	i;
+	register int 	j;
+	register int 	m;
+	register char**	ap;
+	char*		s;
+	int 		k;
+
+	for (j = 1; j <= n; j *= 2);
+	for (m = 2 * j - 1; m /= 2;)
+		for (j = 0, k = n - m; j < k; j++)
+			for (i = j; i >= 0; i -= m)
+			{
+				ap = &argv[i];
+				if ((*fn)(ap[m], ap[0]) >= 0) break;
+				s = ap[m];
+				ap[m] = ap[0];
+				ap[0] = s;
+			}
+}