Author: ache
Date: Tue Sep  6 00:32:33 2016
New Revision: 305447
URL: https://svnweb.freebsd.org/changeset/base/305447

Log:
  MFC r305365
  
  The bug:
  $ echo x | awk '/[[:cntrl:]]/'
  x
  
  The NUL character in cntrl class truncates the pattern, and an empty
  pattern matches anything. The patch skips NUL as a quick fix.
  
  PR:     195792
  Submitted by:   kdrak...@zoho.com
  Approved by:    b...@cs.princeton.edu (the author)

Modified:
  stable/10/contrib/one-true-awk/b.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/contrib/one-true-awk/b.c
==============================================================================
--- stable/10/contrib/one-true-awk/b.c  Mon Sep  5 23:56:27 2016        
(r305446)
+++ stable/10/contrib/one-true-awk/b.c  Tue Sep  6 00:32:33 2016        
(r305447)
@@ -841,7 +841,7 @@ int relex(void)             /* lexical analyzer for
                                if (cc->cc_name != NULL && prestr[1 + 
cc->cc_namelen] == ':' &&
                                    prestr[2 + cc->cc_namelen] == ']') {
                                        prestr += cc->cc_namelen + 3;
-                                       for (i = 0; i < NCHARS; i++) {
+                                       for (i = 1; i < NCHARS; i++) {
                                                if (!adjbuf((char **) &buf, 
&bufsz, bp-buf+1, 100, (char **) &bp, "relex2"))
                                                    FATAL("out of space for reg 
expr %.10s...", lastre);
                                                if (cc->cc_func(i)) {
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