bsearch.c: New file.

* bsearch.c: New file.
* configure.in (funcs): Add bsearch.
(AC_CHECK_FUNCS): Likewise.
* configure, config.in: Regenerate.

From-SVN: r38492

libiberty/ChangeLog

+2000-12-26  Michael Sokolov  <msokolov@ivan.Harhan.ORG>
+
+	* bsearch.c: New file.
+	* configure.in (funcs): Add bsearch.
+	(AC_CHECK_FUNCS): Likewise.
+	* configure, config.in: Regenerate.
+
 2000-12-13  Michael Sokolov  <msokolov@ivan.Harhan.ORG>
 
 	* safe-ctype.c: #include "ansidecl.h".

libiberty/bsearch.c

+/*
+ * Copyright (c) 1990 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. [rescinded 22 July 1999]
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "ansidecl.h"
+#include <sys/types.h>		/* size_t */
+#include <stdio.h>
+
+/*
+ * Perform a binary search.
+ *
+ * The code below is a bit sneaky.  After a comparison fails, we
+ * divide the work in half by moving either left or right. If lim
+ * is odd, moving left simply involves halving lim: e.g., when lim
+ * is 5 we look at item 2, so we change lim to 2 so that we will
+ * look at items 0 & 1.  If lim is even, the same applies.  If lim
+ * is odd, moving right again involes halving lim, this time moving
+ * the base up one item past p: e.g., when lim is 5 we change base
+ * to item 3 and make lim 2 so that we will look at items 3 and 4.
+ * If lim is even, however, we have to shrink it by one before
+ * halving: e.g., when lim is 4, we still looked at item 2, so we
+ * have to make lim 3, then halve, obtaining 1, so that we will only
+ * look at item 3.
+ */
+void *
+bsearch(key, base0, nmemb, size, compar)
+	register void *key;
+	void *base0;
+	size_t nmemb;
+	register size_t size;
+	register int (*compar)();
+{
+	register char *base = base0;
+	register int lim, cmp;
+	register void *p;
+
+	for (lim = nmemb; lim != 0; lim >>= 1) {
+		p = base + (lim >> 1) * size;
+		cmp = (*compar)(key, p);
+		if (cmp == 0)
+			return (p);
+		if (cmp > 0) {	/* key > p: move right */
+			base = (char *)p + size;
+			lim--;
+		} /* else move left */
+	}
+	return (NULL);
+}

libiberty/config.in

@@ -67,6 +67,9 @@
 /* Define if you have the bcopy function.  */
 #undef HAVE_BCOPY
 
+/* Define if you have the bsearch function.  */
+#undef HAVE_BSEARCH
+
 /* Define if you have the bzero function.  */
 #undef HAVE_BZERO
 

libiberty/configure.in

@@ -83,6 +83,7 @@ funcs="$funcs atexit"
 funcs="$funcs basename"
 funcs="$funcs bcmp"
 funcs="$funcs bcopy"
+funcs="$funcs bsearch"
 funcs="$funcs bzero"
 funcs="$funcs calloc"
 funcs="$funcs clock"
@@ -127,13 +128,13 @@ checkfuncs="getrusage on_exit psignal strerror strsignal sysconf times sbrk gett
 # These are neither executed nor required, but they help keep
 # autoheader happy without adding a bunch of text to acconfig.h.
 if test "x" = "y"; then
-  AC_CHECK_FUNCS(asprintf atexit basename bcmp bcopy bzero calloc clock getcwd)
-  AC_CHECK_FUNCS(getpagesize index insque mkstemps memchr memcmp memcpy memmove)
-  AC_CHECK_FUNCS(memset putenv random rename rindex sigsetmask strcasecmp)
-  AC_CHECK_FUNCS(setenv strchr strdup strncasecmp strrchr strstr strtod strtol)
-  AC_CHECK_FUNCS(strtoul tmpnam vasprintf vfprintf vprintf vsprintf waitpid)
-  AC_CHECK_FUNCS(getrusage on_exit psignal strerror strsignal sysconf times)
-  AC_CHECK_FUNCS(sbrk gettimeofday)
+  AC_CHECK_FUNCS(asprintf atexit basename bcmp bcopy bsearch bzero calloc clock)
+  AC_CHECK_FUNCS(getcwd getpagesize index insque mkstemps memchr memcmp memcpy)
+  AC_CHECK_FUNCS(memmove memset putenv random rename rindex sigsetmask)
+  AC_CHECK_FUNCS(strcasecmp setenv strchr strdup strncasecmp strrchr strstr)
+  AC_CHECK_FUNCS(strtod strtol strtoul tmpnam vasprintf vfprintf vprintf)
+  AC_CHECK_FUNCS(vsprintf waitpid getrusage on_exit psignal strerror strsignal)
+  AC_CHECK_FUNCS(sysconf times sbrk gettimeofday)
   AC_DEFINE(HAVE_SYS_ERRLIST, 1, [Define if you have the sys_errlist variable.])
   AC_DEFINE(HAVE_SYS_NERR,    1, [Define if you have the sys_nerr variable.])
   AC_DEFINE(HAVE_SYS_SIGLIST, 1, [Define if you have the sys_siglist variable.])