Re: [PATCH v2 6/8] grep: stess test PCRE v2 on invalid UTF-8 data

[Junio C Hamano <gitster@pobox.com>]

Ævar Arnfjörð Bjarmason  <avarab@gmail.com> writes:

> diff --git a/grep.c b/grep.c
> index 6d60e2e557..5bc0f4f32a 100644
> --- a/grep.c
> +++ b/grep.c
> @@ -615,6 +615,16 @@ static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
>  		die(_("given pattern contains NULL byte (via -f <file>). This is only supported with -P under PCRE v2"));
>  
>  	p->is_fixed = is_fixed(p->pattern, p->patternlen);
> +#ifdef USE_LIBPCRE2
> +       if (!p->fixed && !p->is_fixed) {
> +	       const char *no_jit = "(*NO_JIT)";
> +	       const int no_jit_len = strlen(no_jit);
> +	       if (starts_with(p->pattern, no_jit) &&
> +		   is_fixed(p->pattern + no_jit_len,
> +			    p->patternlen - no_jit_len))
> +		       p->is_fixed = 1;

It is unfortunate that is_fixed() takes a counted string.
Otherwise, using skip_prefix() to avoid "+no_jit_len" would have
made it much easier to read. i.e.

	/* an illustration that does not quite work */
	char *pattern_body;
	if (skip_prefix(p->pattern, "(*NO_JIT)", &pattern_body) &&
            is_fixed(pattern_body))
		p->is_fixed = 1;
	
> +test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: setup invalid UTF-8 data' '
> +	printf "\\200\\n" >invalid-0x80 &&
> +	echo "ævar" >expected &&
> +	cat expected >>invalid-0x80 &&
> +	git add invalid-0x80
> +'
> +
> +test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep ASCII from invalid UTF-8 data' '
> +	git grep -h "var" invalid-0x80 >actual &&
> +	test_cmp expected actual &&
> +	git grep -h "(*NO_JIT)var" invalid-0x80 >actual &&
> +	test_cmp expected actual
> +'
> +
> +test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data' '
> +	test_might_fail git grep -h "æ" invalid-0x80 >actual &&
> +	test_cmp expected actual &&
> +	test_must_fail git grep -h "(*NO_JIT)æ" invalid-0x80 &&
> +	test_cmp expected actual
> +'
> +
> +test_expect_success GETTEXT_LOCALE,LIBPCRE2 'PCRE v2: grep non-ASCII from invalid UTF-8 data with -i' '
> +	test_might_fail git grep -hi "Æ" invalid-0x80 >actual &&
> +	test_cmp expected actual &&
> +	test_must_fail git grep -hi "(*NO_JIT)Æ" invalid-0x80 &&
> +	test_cmp expected actual
> +'
> +
>  test_done