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libc/newlib/libc/locale/nl_langinfo.c
Eric Blake ca3e3bc54e nl_langinfo: Add NL_LOCALE_NAME macro 
Provide an extension NL_LOCALE_NAME() macro, with semantics
matching glibc, which can be used as:
  nl_langinfo_l(NL_LOCALE_NAME(LC_MESSAGES), locale);
to get back the locale string that locale was originally
created with during newlocale(). This in turn allows a library
(such as gettext) to determine what thread-local locale settings
it has inherited from the main program without having to be told
what parameters were passed to newlocale(), for less overall
coupling between parts of the program.

gnulib is set up to use the extension:
https://lists.gnu.org/archive/html/bug-gnulib/2017-01/msg00129.html

* libc/include/langinfo.h (NL_LOCALE_NAME): New macro
* libc/locale/nl_langinfo.c (nl_langinfo_l): Expose locale names
of a locale_t's category components.

Signed-off-by: Eric Blake <eblake@redhat.com>
2017-01-20 10:30:47 +01:00

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/*-
* Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _GNU_SOURCE
#include <sys/cdefs.h>
#include <locale.h>
#include <langinfo.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "setlocale.h"
#undef offsetoff
#define _O(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
#define _NLITEM(cat,memb) { { cat:__get_##cat##_locale }, \
_O (struct lc_##cat##_T, memb) }
#ifdef __HAVE_LOCALE_INFO_EXTENDED__
static struct _nl_item_t
{
union {
const struct lc_ctype_T * (*ctype)(struct __locale_t *);
const struct lc_time_T * (*time)(struct __locale_t *);
const struct lc_numeric_T * (*numeric)(struct __locale_t *);
const struct lc_monetary_T * (*monetary)(struct __locale_t *);
const struct lc_messages_T * (*messages)(struct __locale_t *);
void * (*base)(struct __locale_t *);
};
_off_t offset;
} nl_ext[] =
{
/* First element has an nl_item value of _NL_LOCALE_EXTENDED_FIRST_ENTRY */
_NLITEM (ctype, outdigits[0]),
_NLITEM (ctype, outdigits[1]),
_NLITEM (ctype, outdigits[2]),
_NLITEM (ctype, outdigits[3]),
_NLITEM (ctype, outdigits[4]),
_NLITEM (ctype, outdigits[5]),
_NLITEM (ctype, outdigits[6]),
_NLITEM (ctype, outdigits[7]),
_NLITEM (ctype, outdigits[8]),
_NLITEM (ctype, outdigits[9]),
_NLITEM (ctype, woutdigits[0]),
_NLITEM (ctype, woutdigits[1]),
_NLITEM (ctype, woutdigits[2]),
_NLITEM (ctype, woutdigits[3]),
_NLITEM (ctype, woutdigits[4]),
_NLITEM (ctype, woutdigits[5]),
_NLITEM (ctype, woutdigits[6]),
_NLITEM (ctype, woutdigits[7]),
_NLITEM (ctype, woutdigits[8]),
_NLITEM (ctype, woutdigits[9]),
_NLITEM (time, codeset),
_NLITEM (time, wmon[1]),
_NLITEM (time, wmon[2]),
_NLITEM (time, wmon[3]),
_NLITEM (time, wmon[4]),
_NLITEM (time, wmon[5]),
_NLITEM (time, wmon[6]),
_NLITEM (time, wmon[7]),
_NLITEM (time, wmon[8]),
_NLITEM (time, wmon[9]),
_NLITEM (time, wmon[10]),
_NLITEM (time, wmon[11]),
_NLITEM (time, wmon[12]),
_NLITEM (time, wmonth[1]),
_NLITEM (time, wmonth[2]),
_NLITEM (time, wmonth[3]),
_NLITEM (time, wmonth[4]),
_NLITEM (time, wmonth[5]),
_NLITEM (time, wmonth[6]),
_NLITEM (time, wmonth[7]),
_NLITEM (time, wmonth[8]),
_NLITEM (time, wmonth[9]),
_NLITEM (time, wmonth[10]),
_NLITEM (time, wmonth[11]),
_NLITEM (time, wmonth[12]),
_NLITEM (time, wwday[1]),
_NLITEM (time, wwday[2]),
_NLITEM (time, wwday[3]),
_NLITEM (time, wwday[4]),
_NLITEM (time, wwday[5]),
_NLITEM (time, wwday[6]),
_NLITEM (time, wwday[7]),
_NLITEM (time, wweekday[1]),
_NLITEM (time, wweekday[2]),
_NLITEM (time, wweekday[3]),
_NLITEM (time, wweekday[4]),
_NLITEM (time, wweekday[5]),
_NLITEM (time, wweekday[6]),
_NLITEM (time, wweekday[7]),
_NLITEM (time, wX_fmt),
_NLITEM (time, wx_fmt),
_NLITEM (time, wc_fmt),
_NLITEM (time, wam_pm[0]),
_NLITEM (time, wam_pm[1]),
_NLITEM (time, wdate_fmt),
_NLITEM (time, wampm_fmt),
_NLITEM (time, wera),
_NLITEM (time, wera_d_fmt),
_NLITEM (time, wera_d_t_fmt),
_NLITEM (time, wera_t_fmt),
_NLITEM (time, walt_digits),
_NLITEM (numeric, codeset),
_NLITEM (numeric, grouping),
_NLITEM (numeric, wdecimal_point),
_NLITEM (numeric, wthousands_sep),
_NLITEM (monetary, int_curr_symbol),
_NLITEM (monetary, currency_symbol),
_NLITEM (monetary, mon_decimal_point),
_NLITEM (monetary, mon_thousands_sep),
_NLITEM (monetary, mon_grouping),
_NLITEM (monetary, positive_sign),
_NLITEM (monetary, negative_sign),
_NLITEM (monetary, int_frac_digits),
_NLITEM (monetary, frac_digits),
_NLITEM (monetary, p_cs_precedes),
_NLITEM (monetary, p_sep_by_space),
_NLITEM (monetary, n_cs_precedes),
_NLITEM (monetary, n_sep_by_space),
_NLITEM (monetary, p_sign_posn),
_NLITEM (monetary, n_sign_posn),
_NLITEM (monetary, int_p_cs_precedes),
_NLITEM (monetary, int_p_sep_by_space),
_NLITEM (monetary, int_n_cs_precedes),
_NLITEM (monetary, int_n_sep_by_space),
_NLITEM (monetary, int_p_sign_posn),
_NLITEM (monetary, int_n_sign_posn),
_NLITEM (monetary, codeset),
_NLITEM (monetary, wint_curr_symbol),
_NLITEM (monetary, wcurrency_symbol),
_NLITEM (monetary, wmon_decimal_point),
_NLITEM (monetary, wmon_thousands_sep),
_NLITEM (monetary, wpositive_sign),
_NLITEM (monetary, wnegative_sign),
_NLITEM (messages, codeset),
_NLITEM (messages, wyesexpr),
_NLITEM (messages, wnoexpr),
_NLITEM (messages, wyesstr),
_NLITEM (messages, wnostr),
};
#endif /* __HAVE_LOCALE_INFO_EXTENDED__ */
#define _REL(BASE) ((int)item-BASE)
char *nl_langinfo_l (nl_item item, struct __locale_t *locale)
{
char *ret, *cs;
#ifndef __CYGWIN__
char *s;
#endif
static char *csym = NULL;
char *nptr;
switch (item) {
#ifdef __HAVE_LOCALE_INFO__
case _NL_MESSAGES_CODESET:
ret = (char *) __get_messages_locale (locale)->codeset;
goto do_codeset;
#ifdef __HAVE_LOCALE_INFO_EXTENDED__
case _NL_TIME_CODESET:
ret = (char *) __get_time_locale (locale)->codeset;
goto do_codeset;
case _NL_NUMERIC_CODESET:
ret = (char *) __get_numeric_locale (locale)->codeset;
goto do_codeset;
case _NL_MONETARY_CODESET:
ret = (char *) __get_monetary_locale (locale)->codeset;
goto do_codeset;
#ifdef __CYGWIN__
case _NL_COLLATE_CODESET:
{
ret = (char *) __get_collate_locale (locale)->codeset;
goto do_codeset;
}
#endif /* __CYGWIN__ */
#endif /* __HAVE_LOCALE_INFO_EXTENDED__ */
#endif /* __HAVE_LOCALE_INFO__ */
case CODESET:
#ifdef _MB_CAPABLE
ret = (char *) __locale_charset (locale);
#endif
do_codeset:
#ifdef __CYGWIN__
/* Convert charset to Linux compatible codeset string. */
if (ret[0] == 'A'/*SCII*/)
ret = "ANSI_X3.4-1968";
else if (ret[0] == 'E')
{
if (strcmp (ret, "EUCJP") == 0)
ret = "EUC-JP";
else if (strcmp (ret, "EUCKR") == 0)
ret = "EUC-KR";
else if (strcmp (ret, "EUCCN") == 0)
ret = "GB2312";
}
else if (ret[0] == 'C'/*Pxxxx*/)
{
if (strcmp (ret + 2, "874") == 0)
ret = "TIS-620";
else if (strcmp (ret + 2, "20866") == 0)
ret = "KOI8-R";
else if (strcmp (ret + 2, "21866") == 0)
ret = "KOI8-U";
else if (strcmp (ret + 2, "101") == 0)
ret = "GEORGIAN-PS";
else if (strcmp (ret + 2, "102") == 0)
ret = "PT154";
}
else if (ret[0] == 'S'/*JIS*/)
{
/* Cygwin uses MSFT's implementation of SJIS, which differs
in some codepoints from the real thing, especially
0x5c: yen sign instead of backslash,
0x7e: overline instead of tilde.
We can't use the real SJIS since otherwise Win32
pathnames would become invalid. OTOH, if we return
"SJIS" here, then libiconv will do mb<->wc conversion
differently to our internal functions. Therefore we
return what we really implement, CP932. This is handled
fine by libiconv. */
ret = "CP932";
}
#elif !defined (_MB_CAPABLE)
ret = "US-ASCII";
#endif /* __CYGWIN__ */
break;
case D_T_FMT:
ret = (char *) __get_time_locale (locale)->c_fmt;
break;
case D_FMT:
ret = (char *) __get_time_locale (locale)->x_fmt;
break;
case T_FMT:
ret = (char *) __get_time_locale (locale)->X_fmt;
break;
case T_FMT_AMPM:
ret = (char *) __get_time_locale (locale)->ampm_fmt;
break;
case AM_STR:
ret = (char *) __get_time_locale (locale)->am_pm[0];
break;
case PM_STR:
ret = (char *) __get_time_locale (locale)->am_pm[1];
break;
case DAY_1: case DAY_2: case DAY_3:
case DAY_4: case DAY_5: case DAY_6: case DAY_7:
ret = (char*) __get_time_locale (locale)->weekday[_REL(DAY_1)];
break;
case ABDAY_1: case ABDAY_2: case ABDAY_3:
case ABDAY_4: case ABDAY_5: case ABDAY_6: case ABDAY_7:
ret = (char*) __get_time_locale (locale)->wday[_REL(ABDAY_1)];
break;
case MON_1: case MON_2: case MON_3: case MON_4:
case MON_5: case MON_6: case MON_7: case MON_8:
case MON_9: case MON_10: case MON_11: case MON_12:
ret = (char*) __get_time_locale (locale)->month[_REL(MON_1)];
break;
case ABMON_1: case ABMON_2: case ABMON_3: case ABMON_4:
case ABMON_5: case ABMON_6: case ABMON_7: case ABMON_8:
case ABMON_9: case ABMON_10: case ABMON_11: case ABMON_12:
ret = (char*) __get_time_locale (locale)->mon[_REL(ABMON_1)];
break;
case ERA:
ret = (char*) __get_time_locale (locale)->era;
break;
case ERA_D_FMT:
ret = (char*) __get_time_locale (locale)->era_d_fmt;
break;
case ERA_D_T_FMT:
ret = (char*) __get_time_locale (locale)->era_d_t_fmt;
break;
case ERA_T_FMT:
ret = (char*) __get_time_locale (locale)->era_t_fmt;
break;
case ALT_DIGITS:
ret = (char*) __get_time_locale (locale)->alt_digits;
break;
case _DATE_FMT: /* GNU extension */
ret = (char*) __get_time_locale (locale)->date_fmt;
break;
case RADIXCHAR:
ret = (char*) __get_numeric_locale (locale)->decimal_point;
break;
case THOUSEP:
ret = (char*) __get_numeric_locale (locale)->thousands_sep;
break;
case YESEXPR:
ret = (char*) __get_messages_locale (locale)->yesexpr;
break;
case NOEXPR:
ret = (char*) __get_messages_locale (locale)->noexpr;
break;
/*
* All items marked with LEGACY are available, but not recomended
* by SUSv2 to be used in portable applications since they're subject
* to remove in future specification editions
*/
case YESSTR: /* LEGACY */
ret = (char*) __get_messages_locale (locale)->yesstr;
break;
case NOSTR: /* LEGACY */
ret = (char*) __get_messages_locale (locale)->nostr;
break;
case CRNCYSTR:
ret = "";
cs = (char*) __get_monetary_locale (locale)->currency_symbol;
if (*cs != '\0') {
char pos = __localeconv_l (locale)->p_cs_precedes;
if (pos == __localeconv_l (locale)->n_cs_precedes) {
char psn = '\0';
if (pos == CHAR_MAX) {
if (strcmp(cs, __get_monetary_locale (locale)->mon_decimal_point) == 0)
psn = '.';
} else
psn = pos ? '-' : '+';
if (psn != '\0') {
int clen = strlen(cs);
nptr = realloc(csym, clen + 2);
if (!nptr && csym)
free (csym);
csym = nptr;
if (csym != NULL) {
*csym = psn;
strcpy(csym + 1, cs);
ret = csym;
}
}
}
}
break;
case D_MD_ORDER: /* local extension */
ret = (char *) __get_time_locale (locale)->md_order;
break;
#ifdef __HAVE_LOCALE_INFO__
case _NL_CTYPE_MB_CUR_MAX:
ret = (char *) __get_ctype_locale (locale)->mb_cur_max;
break;
#endif
default:
/* Relies on the fact that LC_ALL is 0, and all other
LC_ constants are in ascending order. */
if (item > NL_LOCALE_NAME(LC_ALL)
&& item < NL_LOCALE_NAME(_LC_LAST)) {
return locale->categories[item
- NL_LOCALE_NAME(LC_ALL)];
}
#ifdef __HAVE_LOCALE_INFO_EXTENDED__
if (item > _NL_LOCALE_EXTENDED_FIRST_ENTRY
&& item < _NL_LOCALE_EXTENDED_LAST_ENTRY) {
int idx = item - _NL_LOCALE_EXTENDED_FIRST_ENTRY - 1;
return *(char **) ((char *) (*nl_ext[idx].base)(locale)
+ nl_ext[idx].offset);
}
#endif
ret = "";
}
return (ret);
}
char *nl_langinfo (nl_item item)
{
return nl_langinfo_l (item, __get_current_locale ());
}
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