Author: markj
Date: Mon Jan 13 18:29:47 2020
New Revision: 356695
URL: https://svnweb.freebsd.org/changeset/base/356695

Log:
  Optimize diff -q.
  
  Once we know whether the files differ, we don't need to do any further
  work.
  
  PR:           242828
  Submitted by: fehmi noyan isi <fnoyan...@yahoo.com> (original version)
  Reviewed by:  bapt, kevans
  MFC after:    1 week
  Differential Revision:        https://reviews.freebsd.org/D23152

Modified:
  head/usr.bin/diff/diffreg.c

Modified: head/usr.bin/diff/diffreg.c
==============================================================================
--- head/usr.bin/diff/diffreg.c Mon Jan 13 18:26:27 2020        (r356694)
+++ head/usr.bin/diff/diffreg.c Mon Jan 13 18:29:47 2020        (r356695)
@@ -349,6 +349,11 @@ diffreg(char *file1, char *file2, int flags, int capsi
                goto closem;
        }
 
+       if (diff_format == D_BRIEF) {
+               rval = D_DIFFER;
+               status |= 1;
+               goto closem;
+       }
        if ((flags & D_FORCEASCII) == 0 &&
            (!asciifile(f1) || !asciifile(f2))) {
                rval = D_BINARY;
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