grep branch, master, updated. v2.13-11-g8c74af8

[Jim Meyering]

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- Log -----------------------------------------------------------------
http://git.savannah.gnu.org/cgit/grep.git/commit/?id=8c74af84958634a22a24dbc7fecf3fafd3f8e4bd


commit 8c74af84958634a22a24dbc7fecf3fafd3f8e4bd
Author: Jim Meyering <address@hidden>
Date:   Mon Jul 30 11:39:29 2012 +0200

    maint: optimize long-line processing
    
    * src/main.c (grep): Use memrchr rather than an open-coded loop,
    reducing the cost of the replaced code by 50% when processing very
    long lines.  If there were a rawmemrchr function (analogous to glibc's
    rawmemchr), then the performance improvement would be even greater.

diff --git a/src/main.c b/src/main.c
index 84066d8..e3b5186 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1200,8 +1200,10 @@ grep (int fd, struct stat const *st)
          the buffer, 0 means there is no incomplete last line).  */
       oldc = beg[-1];
       beg[-1] = eol;
-      for (lim = buflim; lim[-1] != eol; lim--)
-        continue;
+      /* FIXME: use rawmemrchr if/when it exists, since we have ensured
+         that this use of memrchr is guaranteed never to return NULL.  */
+      lim = memrchr (beg - 1, eol, buflim - beg + 1);
+      ++lim;
       beg[-1] = oldc;
       if (lim == beg)
         lim = beg - residue;

-----------------------------------------------------------------------

Summary of changes:
 src/main.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)


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