Re: [PATCH 1/3] grep: make pcre1_tables version agnostic

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

On Sat, Jul 27 2019, Carlo Marcelo Arenas Belón wrote:

> 6d4b5747f0 ("grep: change internal *pcre* variable & function names
> to be *pcre1*", 2017-05-25), renamed most variables to be PCRE1
> specific to give space to similarly named variables for PCRE2, but
> in this case the change wasn't needed as the types were compatible
> enough (const unsigned char* vs const uint8_t*) to be shared.

Both the v1 and v2 functions return const unsigned char *. I don't know
where I got the uint8_t from. This makes more sense.

This series looks good to me. Thanks for the fix. Just one caveat:

The point of 6d4b5747f0 was not to only split out those variables we
couldn't get away with re-using. Then I would have later re-used
e.g. pcre1_jit_on & pcre2_jit_on as just pcre_jit_on. We could also do
that now.

I think doing that & this part of the your changes makes things less
readable. The two code branches we compile with ifdefs are mutually
exclusive, so having the variables be unique helps with eyeballing /
reasoning when changing the code.

> Revert that change, as 94da9193a6 ("grep: add support for PCRE v2",
> 2017-06-01) failed to create an equivalent PCRE2 version.
>
> Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
> ---
>  grep.c | 6 +++---
>  grep.h | 2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/grep.c b/grep.c
> index f7c3a5803e..cc65f7a987 100644
> --- a/grep.c
> +++ b/grep.c
> @@ -389,14 +389,14 @@ static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
>
>  	if (opt->ignore_case) {
>  		if (has_non_ascii(p->pattern))
> -			p->pcre1_tables = pcre_maketables();
> +			p->pcre_tables = pcre_maketables();
>  		options |= PCRE_CASELESS;
>  	}
>  	if (is_utf8_locale() && has_non_ascii(p->pattern))
>  		options |= PCRE_UTF8;
>
>  	p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
> -				      p->pcre1_tables);
> +				      p->pcre_tables);
>  	if (!p->pcre1_regexp)
>  		compile_regexp_failed(p, error);
>
> @@ -462,7 +462,7 @@ static void free_pcre1_regexp(struct grep_pat *p)
>  	{
>  		pcre_free(p->pcre1_extra_info);
>  	}
> -	pcre_free((void *)p->pcre1_tables);
> +	pcre_free((void *)p->pcre_tables);
>  }
>  #else /* !USE_LIBPCRE1 */
>  static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
> diff --git a/grep.h b/grep.h
> index 1875880f37..d34f66b384 100644
> --- a/grep.h
> +++ b/grep.h
> @@ -89,7 +89,7 @@ struct grep_pat {
>  	pcre *pcre1_regexp;
>  	pcre_extra *pcre1_extra_info;
>  	pcre_jit_stack *pcre1_jit_stack;
> -	const unsigned char *pcre1_tables;
> +	const unsigned char *pcre_tables;
>  	int pcre1_jit_on;
>  	pcre2_code *pcre2_pattern;
>  	pcre2_match_data *pcre2_match_data;