Got it, thanks for your reply :)

On Thu, Mar 8, 2018 at 1:13 PM, Ruslan Ermilov <ru@nginx.com> wrote:
> On Thu, Mar 08, 2018 at 08:42:06AM +0800, Junwang Zhao wrote:
>> I'm a little bit confused why the diffs are equal to each other,
>> ASAICS, the changed code removed the effect of 'flags'?
>>
>> Can you explain a little bit since I just began to read the code base :)
>
> "flags | ~NGX_HTTP_VAR_WEAK" would either evaluate to "all bits set"
> or "all bits set except NGX_HTTP_VAR_WEAK" if this bit is not set in
> "flags".
>
>> 2018-03-07 23:29 GMT+08:00 Ruslan Ermilov <ru@nginx.com>:
>> > details: http://hg.nginx.org/nginx/rev/0b1eb40de6da
>> > branches:
>> > changeset: 7226:0b1eb40de6da
>> > user: Ruslan Ermilov <ru@nginx.com>
>> > date: Wed Mar 07 18:28:12 2018 +0300
>> > description:
>> > Improved code readablity.
>> >
>> > No functional changes.
>> >
>> > diffstat:
>> >
>> > src/http/ngx_http_variables.c | 8 ++++++--
>> > src/stream/ngx_stream_variables.c | 8 ++++++--
>> > 2 files changed, 12 insertions(+), 4 deletions(-)
>> >
>> > diffs (50 lines):
>> >
>> > diff -r e80930e5e422 -r 0b1eb40de6da src/http/ngx_http_variables.c
>> > --- a/src/http/ngx_http_variables.c Mon Mar 05 21:35:13 2018 +0300
>> > +++ b/src/http/ngx_http_variables.c Wed Mar 07 18:28:12 2018 +0300
>> > @@ -429,7 +429,9 @@ ngx_http_add_variable(ngx_conf_t *cf, ng
>> > return NULL;
>> > }
>> >
>> > - v->flags &= flags | ~NGX_HTTP_VAR_WEAK;
>> > + if (!(flags & NGX_HTTP_VAR_WEAK)) {
>> > + v->flags &= ~NGX_HTTP_VAR_WEAK;
>> > + }
>> >
>> > return v;
>> > }
>> > @@ -494,7 +496,9 @@ ngx_http_add_prefix_variable(ngx_conf_t
>> > return NULL;
>> > }
>> >
>> > - v->flags &= flags | ~NGX_HTTP_VAR_WEAK;
>> > + if (!(flags & NGX_HTTP_VAR_WEAK)) {
>> > + v->flags &= ~NGX_HTTP_VAR_WEAK;
>> > + }
>> >
>> > return v;
>> > }
>> > diff -r e80930e5e422 -r 0b1eb40de6da src/stream/ngx_stream_variables.c
>> > --- a/src/stream/ngx_stream_variables.c Mon Mar 05 21:35:13 2018 +0300
>> > +++ b/src/stream/ngx_stream_variables.c Wed Mar 07 18:28:12 2018 +0300
>> > @@ -161,7 +161,9 @@ ngx_stream_add_variable(ngx_conf_t *cf,
>> > return NULL;
>> > }
>> >
>> > - v->flags &= flags | ~NGX_STREAM_VAR_WEAK;
>> > + if (!(flags & NGX_STREAM_VAR_WEAK)) {
>> > + v->flags &= ~NGX_STREAM_VAR_WEAK;
>> > + }
>> >
>> > return v;
>> > }
>> > @@ -227,7 +229,9 @@ ngx_stream_add_prefix_variable(ngx_conf_
>> > return NULL;
>> > }
>> >
>> > - v->flags &= flags | ~NGX_STREAM_VAR_WEAK;
>> > + if (!(flags & NGX_STREAM_VAR_WEAK)) {
>> > + v->flags &= ~NGX_STREAM_VAR_WEAK;
>> > + }
>> >
>> > return v;
>> > }
>> > _______________________________________________
>> > nginx-devel mailing list
>> > nginx-devel@nginx.org
>> > http://mailman.nginx.org/mailman/listinfo/nginx-devel
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>>
>
> --
> Ruslan Ermilov
> Assume stupidity not malice
> _______________________________________________
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> nginx-devel@nginx.org
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