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Message-ID: <CAPG2z09AuL34DODuEBVfNy4CXKatj2HivbMMxN_gphZzyt9ecw@mail.gmail.com>
Date: Sat, 18 Mar 2017 21:36:56 +0800
From: He X <xw897002528@...il.com>
To: musl@...ts.openwall.com
Subject: Re: [setlocale]: return only one copy if all six parts of
locale are same
tested:
[xhe@...-PC locale]$ ./a.out
C
zh_CN.UTF-8
zh_CN.UTF-8
[xhe@...-PC locale]$ cat test.c
#include <locale.h>
int main() {
printf("%s\n", setlocale(LC_ALL, NULL));
printf("%s\n", setlocale(LC_ALL, ""));
printf("%s\n", setlocale(LC_ALL, NULL));
}
2017-03-18 20:33 GMT+08:00 Rich Felker <dalias@...c.org>:
> On Sat, Mar 18, 2017 at 07:37:57AM +0000, He X wrote:
> > As i suggest on IRC, here's the patch.
>
> > --- musl-1.1.16/src/locale/setlocale.c 2017-03-17
> 17:49:15.767952411 +0000
> > +++ musl-1.1.16/src/locale/setlocale.c 2017-03-17
> 17:49:15.767952411 +0000
> > @@ -48,16 +48,33 @@
> > }
> > }
> > char *s = buf;
> > - for (i=0; i<LC_ALL; i++) {
> > + const struct __locale_map *flm =
> > + libc.global_locale.cat[0];
> > + const char *fpart = flm ? flm->name : "C";
> > + size_t l = strlen(fpart);
> > + memcpy(s, fpart, l);
> > + s[l] = 0;
> > + i=1;
> > + do {
> > const struct __locale_map *lm =
> > libc.global_locale.cat[i];
> > const char *part = lm ? lm->name : "C";
> > - size_t l = strlen(part);
> > - memcpy(s, part, l);
> > - s[l] = ';';
> > - s += l+1;
> > + if (strcmp(s, part)) break;
> > + i++;
> > + } while (i<LC_ALL);
> > +
> > + if (i != LC_ALL) {
> > + for (i=0; i<LC_ALL; i++) {
> > + const struct __locale_map *lm =
> > + libc.global_locale.cat[i];
> > + const char *part = lm ? lm->name : "C";
> > + size_t l = strlen(part);
> > + memcpy(s, part, l);
> > + s[l] = ';';
> > + s += l+1;
> > + }
> > + *--s = 0;
> > }
> > - *--s = 0;
> > UNLOCK(lock);
> > return buf;
> > }
>
> I think the results of this patch can be achieved much more simply.
> Just compare lm pointers (rather than string contents) for equality at
> each iteration in the current loop, counting how many were equal to
> libc.global_locale.cat[0]. If that number equals LC_ALL, return
> libc.global_locale.cat[0]->name (or "C" if the lm is null) rather than
> buf.
>
> Rich
>
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