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grep/icase: avoid kwsset on literal non-ascii strings 

When we detect the pattern is just a literal string, we avoid heavy
regex engine and use fast substring search implemented in kwsset.c.
But kws uses git-ctype which is locale-independent so it does not know
how to fold case properly outside ascii range. Let regcomp or pcre
take care of this case instead. Slower, but accurate.

Noticed-by: Plamen Totev <plamen.totev@abv.bg>
Helped-by: René Scharfe <l.s.r@web.de>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2016-06-25 07:22:30 +02:00 committed by Junio C Hamano
parent d8acfe1eaf
commit 5c1ebcca4d
2 changed files with 29 additions and 1 deletions
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7
grep.c
View File

@ -4,6 +4,7 @@
#include "xdiff-interface.h"
#include "diff.h"
#include "diffcore.h"
#include "commit.h"
static int grep_source_load(struct grep_source *gs);
static int grep_source_is_binary(struct grep_source *gs);
@ -398,14 +399,18 @@ static int is_fixed(const char *s, size_t len)
static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
{
int icase, ascii_only;
int err;
p->word_regexp = opt->word_regexp;
p->ignore_case = opt->ignore_case;
icase = opt->regflags & REG_ICASE || p->ignore_case;
ascii_only = !has_non_ascii(p->pattern);
if (opt->fixed)
p->fixed = 1;
else if (is_fixed(p->pattern, p->patternlen))
else if ((!icase || ascii_only) &&
is_fixed(p->pattern, p->patternlen))
p->fixed = 1;
else
p->fixed = 0;

23
t/t7812-grep-icase-non-ascii.sh Executable file
View File

@ -0,0 +1,23 @@
#!/bin/sh
test_description='grep icase on non-English locales'
. ./lib-gettext.sh
test_expect_success GETTEXT_LOCALE 'setup' '
test_write_lines "TILRAUN: Halló Heimur!" >file &&
git add file &&
LC_ALL="$is_IS_locale" &&
export LC_ALL
'
test_have_prereq GETTEXT_LOCALE &&
test-regex "HALLÓ" "Halló" ICASE &&
test_set_prereq REGEX_LOCALE
test_expect_success REGEX_LOCALE 'grep literal string, no -F' '
git grep -i "TILRAUN: Halló Heimur!" &&
git grep -i "TILRAUN: HALLÓ HEIMUR!"
'
test_done