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Automatically disable DFA when processing multibyte input. GREP_USE_DFA

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environment variable overrides.

Obtained from:	Fedora (Tim Waugh)
This commit is contained in:
Tim J. Robbins 2005-05-14 06:12:03 +00:00
parent aed59eaecf
commit 4475bed3d2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=146206
1 changed files with 28 additions and 3 deletions
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31
gnu/usr.bin/grep/search.c
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@ -329,12 +329,34 @@ EGexecute (char const *buf, size_t size, size_t *match_size, int exact)
int backref, start, len;
struct kwsmatch kwsm;
size_t i, ret_val;
static int use_dfa;
static int use_dfa_checked = 0;
#ifdef MBS_SUPPORT
int mb_cur_max = MB_CUR_MAX;
mbstate_t mbs;
memset (&mbs, '\0', sizeof (mbstate_t));
#endif /* MBS_SUPPORT */
if (!use_dfa_checked)
{
char *grep_use_dfa = getenv ("GREP_USE_DFA");
if (!grep_use_dfa)
{
#ifdef MBS_SUPPORT
/* Turn off DFA when processing multibyte input. */
use_dfa = (MB_CUR_MAX == 1);
#else
use_dfa = 1;
#endif /* MBS_SUPPORT */
}
else
{
use_dfa = atoi (grep_use_dfa);
}
use_dfa_checked = 1;
}
buflim = buf + size;
for (beg = end = buf; end < buflim; beg = end)
@ -402,7 +424,8 @@ EGexecute (char const *buf, size_t size, size_t *match_size, int exact)
#endif /* MBS_SUPPORT */
(kwsm.index < kwset_exact_matches))
goto success_in_beg_and_end;
if (dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
if (use_dfa &&
dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
continue;
}
else
@ -411,7 +434,9 @@ EGexecute (char const *buf, size_t size, size_t *match_size, int exact)
#ifdef MBS_SUPPORT
size_t bytes_left = 0;
#endif /* MBS_SUPPORT */
size_t offset = dfaexec (&dfa, beg, buflim - beg, &backref);
size_t offset = 0;
if (use_dfa)
offset = dfaexec (&dfa, beg, buflim - beg, &backref);
if (offset == (size_t) -1)
break;
/* Narrow down to the line we've found. */
@ -453,7 +478,7 @@ EGexecute (char const *buf, size_t size, size_t *match_size, int exact)
--beg;
}
/* Successful, no backreferences encountered! */
if (!backref)
if (use_dfa && !backref)
goto success_in_beg_and_end;
}
else