[src/trunk]: src/usr.sbin/makemandb Instead of dereferencing the pointer pass...

[abhinav <abhinav%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fe1c8cf9d6a1
branches:  trunk
changeset: 353342:fe1c8cf9d6a1
user:      abhinav <abhinav%NetBSD.org@localhost>
date:      Sun Apr 30 15:27:24 2017 +0000

description:
Instead of dereferencing the pointer passed in as function argument, use a
temporary local buffer. Saves the cost of pointer dereferencing at so many places.

diffstat:

 usr.sbin/makemandb/apropos-utils.c |  21 ++++++++++++---------
 1 files changed, 12 insertions(+), 9 deletions(-)

diffs (60 lines):

diff -r 81fcd9459b7d -r fe1c8cf9d6a1 usr.sbin/makemandb/apropos-utils.c
--- a/usr.sbin/makemandb/apropos-utils.c        Sun Apr 30 14:53:58 2017 +0000
+++ b/usr.sbin/makemandb/apropos-utils.c        Sun Apr 30 15:27:24 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: apropos-utils.c,v 1.34 2017/04/30 14:53:58 abhinav Exp $       */
+/*     $NetBSD: apropos-utils.c,v 1.35 2017/04/30 15:27:24 abhinav Exp $       */
 /*-
  * Copyright (c) 2011 Abhinav Upadhyay <er.abhinav.upadhyay%gmail.com@localhost>
  * All rights reserved.
@@ -31,7 +31,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: apropos-utils.c,v 1.34 2017/04/30 14:53:58 abhinav Exp $");
+__RCSID("$NetBSD: apropos-utils.c,v 1.35 2017/04/30 15:27:24 abhinav Exp $");
 
 #include <sys/queue.h>
 #include <sys/stat.h>
@@ -111,31 +111,34 @@
 concat2(char **dst, const char *src, size_t srclen)
 {
        size_t totallen, dstlen;
+       char *mydst = *dst;
        assert(src != NULL);
 
        /*
         * If destination buffer dst is NULL, then simply
         * strdup the source buffer
         */
-       if (*dst == NULL) {
-               *dst = estrndup(src, srclen);
+       if (mydst == NULL) {
+               mydst = estrndup(src, srclen);
+               *dst = mydst;
                return;
        }
 
-       dstlen = strlen(*dst);
+       dstlen = strlen(mydst);
        /*
         * NUL Byte and separator space
         */
        totallen = dstlen + srclen + 2;
 
-       *dst = erealloc(*dst, totallen);
+       mydst = erealloc(mydst, totallen);
 
        /* Append a space at the end of dst */
-       (*dst)[dstlen++] = ' ';
+       mydst[dstlen++] = ' ';
 
        /* Now, copy src at the end of dst */
-       memcpy(*dst + dstlen, src, srclen);
-       (*dst)[dstlen + srclen] = '\0';
+       memcpy(mydst + dstlen, src, srclen);
+       mydst[dstlen + srclen] = '\0';
+       *dst = mydst;
 }
 
 void