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locale.c
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locale.c
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/* locale.c
*
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
* 2002, 2003, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* A Elbereth Gilthoniel,
* silivren penna míriel
* o menel aglar elenath!
* Na-chaered palan-díriel
* o galadhremmin ennorath,
* Fanuilos, le linnathon
* nef aear, si nef aearon!
*
* [p.238 of _The Lord of the Rings_, II/i: "Many Meetings"]
*/
/* utility functions for handling locale-specific stuff like what
* character represents the decimal point.
*
* All C programs have an underlying locale. Perl code generally doesn't pay
* any attention to it except within the scope of a 'use locale'. For most
* categories, it accomplishes this by just using different operations if it is
* in such scope than if not. However, various libc functions called by Perl
* are affected by the LC_NUMERIC category, so there are macros in perl.h that
* are used to toggle between the current locale and the C locale depending on
* the desired behavior of those functions at the moment. And, LC_MESSAGES is
* switched to the C locale for outputting the message unless within the scope
* of 'use locale'.
*
* This code now has multi-thread-safe locale handling on systems that support
* that. This is completely transparent to most XS code. On earlier systems,
* it would be possible to emulate thread-safe locales, but this likely would
* involve a lot of locale switching, and would require XS code changes.
* Macros could be written so that the code wouldn't have to know which type of
* system is being used. It's unlikely that we would ever do that, since most
* modern systems support thread-safe locales, but there was code written to
* this end, and is retained, #ifdef'd out.
*/
/* If the environment says to, we can output debugging information during
* initialization. This is done before option parsing, and before any thread
* creation, so can be a file-level static. (Must come before #including
* perl.h) */
#ifdef DEBUGGING
static int debug_initialization = 0;
# define DEBUG_INITIALIZATION_set(v) (debug_initialization = v)
# define DEBUG_LOCALE_INITIALIZATION_ debug_initialization
#else
# define debug_initialization 0
# define DEBUG_INITIALIZATION_set(v)
#endif
#include "EXTERN.h"
#define PERL_IN_LOCALE_C
#include "perl_langinfo.h"
#include "perl.h"
#include "reentr.h"
#ifdef I_WCHAR
# include <wchar.h>
#endif
#ifdef I_WCTYPE
# include <wctype.h>
#endif
/* Returns the Unix errno portion; ignoring any others. This is a macro here
* instead of putting it into perl.h, because unclear to khw what should be
* done generally. */
#define GET_ERRNO saved_errno
/* strlen() of a literal string constant. We might want this more general,
* but using it in just this file for now. A problem with more generality is
* the compiler warnings about comparing unlike signs */
#define STRLENs(s) (sizeof("" s "") - 1)
/* Is the C string input 'name' "C" or "POSIX"? If so, and 'name' is the
* return of setlocale(), then this is extremely likely to be the C or POSIX
* locale. However, the output of setlocale() is documented to be opaque, but
* the odds are extremely small that it would return these two strings for some
* other locale. Note that VMS in these two locales includes many non-ASCII
* characters as controls and punctuation (below are hex bytes):
* cntrl: 84-97 9B-9F
* punct: A1-A3 A5 A7-AB B0-B3 B5-B7 B9-BD BF-CF D1-DD DF-EF F1-FD
* Oddly, none there are listed as alphas, though some represent alphabetics
* http://www.nntp.perl.org/group/perl.perl5.porters/2013/02/msg198753.html */
#define isNAME_C_OR_POSIX(name) \
( (name) != NULL \
&& (( *(name) == 'C' && (*(name + 1)) == '\0') \
|| strEQ((name), "POSIX")))
#ifdef USE_LOCALE
/* This code keeps a LRU cache of the UTF-8ness of the locales it has so-far
* looked up. This is in the form of a C string: */
#define UTF8NESS_SEP "\v"
#define UTF8NESS_PREFIX "\f"
/* So, the string looks like:
*
* \vC\a0\vPOSIX\a0\vam_ET\a0\vaf_ZA.utf8\a1\ven_US.UTF-8\a1\0
*
* where the digit 0 after the \a indicates that the locale starting just
* after the preceding \v is not UTF-8, and the digit 1 mean it is. */
STATIC_ASSERT_DECL(STRLENs(UTF8NESS_SEP) == 1);
STATIC_ASSERT_DECL(STRLENs(UTF8NESS_PREFIX) == 1);
#define C_and_POSIX_utf8ness UTF8NESS_SEP "C" UTF8NESS_PREFIX "0" \
UTF8NESS_SEP "POSIX" UTF8NESS_PREFIX "0"
/* The cache is initialized to C_and_POSIX_utf8ness at start up. These are
* kept there always. The remining portion of the cache is LRU, with the
* oldest looked-up locale at the tail end */
STATIC char *
S_stdize_locale(pTHX_ char *locs)
{
/* Standardize the locale name from a string returned by 'setlocale',
* possibly modifying that string.
*
* The typical return value of setlocale() is either
* (1) "xx_YY" if the first argument of setlocale() is not LC_ALL
* (2) "xa_YY xb_YY ..." if the first argument of setlocale() is LC_ALL
* (the space-separated values represent the various sublocales,
* in some unspecified order). This is not handled by this function.
*
* In some platforms it has a form like "LC_SOMETHING=Lang_Country.866\n",
* which is harmful for further use of the string in setlocale(). This
* function removes the trailing new line and everything up through the '='
* */
const char * const s = strchr(locs, '=');
bool okay = TRUE;
PERL_ARGS_ASSERT_STDIZE_LOCALE;
if (s) {
const char * const t = strchr(s, '.');
okay = FALSE;
if (t) {
const char * const u = strchr(t, '\n');
if (u && (u[1] == 0)) {
const STRLEN len = u - s;
Move(s + 1, locs, len, char);
locs[len] = 0;
okay = TRUE;
}
}
}
if (!okay)
Perl_croak(aTHX_ "Can't fix broken locale name \"%s\"", locs);
return locs;
}
/* Two parallel arrays; first the locale categories Perl uses on this system;
* the second array is their names. These arrays are in mostly arbitrary
* order. */
const int categories[] = {
# ifdef USE_LOCALE_NUMERIC
LC_NUMERIC,
# endif
# ifdef USE_LOCALE_CTYPE
LC_CTYPE,
# endif
# ifdef USE_LOCALE_COLLATE
LC_COLLATE,
# endif
# ifdef USE_LOCALE_TIME
LC_TIME,
# endif
# ifdef USE_LOCALE_MESSAGES
LC_MESSAGES,
# endif
# ifdef USE_LOCALE_MONETARY
LC_MONETARY,
# endif
# ifdef USE_LOCALE_ADDRESS
LC_ADDRESS,
# endif
# ifdef USE_LOCALE_IDENTIFICATION
LC_IDENTIFICATION,
# endif
# ifdef USE_LOCALE_MEASUREMENT
LC_MEASUREMENT,
# endif
# ifdef USE_LOCALE_PAPER
LC_PAPER,
# endif
# ifdef USE_LOCALE_TELEPHONE
LC_TELEPHONE,
# endif
# ifdef USE_LOCALE_SYNTAX
LC_SYNTAX,
# endif
# ifdef USE_LOCALE_TOD
LC_TOD,
# endif
# ifdef LC_ALL
LC_ALL,
# endif
-1 /* Placeholder because C doesn't allow a
trailing comma, and it would get complicated
with all the #ifdef's */
};
/* The top-most real element is LC_ALL */
const char * const category_names[] = {
# ifdef USE_LOCALE_NUMERIC
"LC_NUMERIC",
# endif
# ifdef USE_LOCALE_CTYPE
"LC_CTYPE",
# endif
# ifdef USE_LOCALE_COLLATE
"LC_COLLATE",
# endif
# ifdef USE_LOCALE_TIME
"LC_TIME",
# endif
# ifdef USE_LOCALE_MESSAGES
"LC_MESSAGES",
# endif
# ifdef USE_LOCALE_MONETARY
"LC_MONETARY",
# endif
# ifdef USE_LOCALE_ADDRESS
"LC_ADDRESS",
# endif
# ifdef USE_LOCALE_IDENTIFICATION
"LC_IDENTIFICATION",
# endif
# ifdef USE_LOCALE_MEASUREMENT
"LC_MEASUREMENT",
# endif
# ifdef USE_LOCALE_PAPER
"LC_PAPER",
# endif
# ifdef USE_LOCALE_TELEPHONE
"LC_TELEPHONE",
# endif
# ifdef USE_LOCALE_SYNTAX
"LC_SYNTAX",
# endif
# ifdef USE_LOCALE_TOD
"LC_TOD",
# endif
# ifdef LC_ALL
"LC_ALL",
# endif
NULL /* Placeholder */
};
# ifdef LC_ALL
/* On systems with LC_ALL, it is kept in the highest index position. (-2
* to account for the final unused placeholder element.) */
# define NOMINAL_LC_ALL_INDEX (C_ARRAY_LENGTH(categories) - 2)
# else
/* On systems without LC_ALL, we pretend it is there, one beyond the real
* top element, hence in the unused placeholder element. */
# define NOMINAL_LC_ALL_INDEX (C_ARRAY_LENGTH(categories) - 1)
# endif
/* Pretending there is an LC_ALL element just above allows us to avoid most
* special cases. Most loops through these arrays in the code below are
* written like 'for (i = 0; i < NOMINAL_LC_ALL_INDEX; i++)'. They will work
* on either type of system. But the code must be written to not access the
* element at 'LC_ALL_INDEX' except on platforms that have it. This can be
* checked for at compile time by using the #define LC_ALL_INDEX which is only
* defined if we do have LC_ALL. */
STATIC const char *
S_category_name(const int category)
{
unsigned int i;
#ifdef LC_ALL
if (category == LC_ALL) {
return "LC_ALL";
}
#endif
for (i = 0; i < NOMINAL_LC_ALL_INDEX; i++) {
if (category == categories[i]) {
return category_names[i];
}
}
{
const char suffix[] = " (unknown)";
int temp = category;
Size_t length = sizeof(suffix) + 1;
char * unknown;
dTHX;
if (temp < 0) {
length++;
temp = - temp;
}
/* Calculate the number of digits */
while (temp >= 10) {
temp /= 10;
length++;
}
Newx(unknown, length, char);
my_snprintf(unknown, length, "%d%s", category, suffix);
SAVEFREEPV(unknown);
return unknown;
}
}
/* Now create LC_foo_INDEX #defines for just those categories on this system */
# ifdef USE_LOCALE_NUMERIC
# define LC_NUMERIC_INDEX 0
# define _DUMMY_NUMERIC LC_NUMERIC_INDEX
# else
# define _DUMMY_NUMERIC -1
# endif
# ifdef USE_LOCALE_CTYPE
# define LC_CTYPE_INDEX _DUMMY_NUMERIC + 1
# define _DUMMY_CTYPE LC_CTYPE_INDEX
# else
# define _DUMMY_CTYPE _DUMMY_NUMERIC
# endif
# ifdef USE_LOCALE_COLLATE
# define LC_COLLATE_INDEX _DUMMY_CTYPE + 1
# define _DUMMY_COLLATE LC_COLLATE_INDEX
# else
# define _DUMMY_COLLATE _DUMMY_CTYPE
# endif
# ifdef USE_LOCALE_TIME
# define LC_TIME_INDEX _DUMMY_COLLATE + 1
# define _DUMMY_TIME LC_TIME_INDEX
# else
# define _DUMMY_TIME _DUMMY_COLLATE
# endif
# ifdef USE_LOCALE_MESSAGES
# define LC_MESSAGES_INDEX _DUMMY_TIME + 1
# define _DUMMY_MESSAGES LC_MESSAGES_INDEX
# else
# define _DUMMY_MESSAGES _DUMMY_TIME
# endif
# ifdef USE_LOCALE_MONETARY
# define LC_MONETARY_INDEX _DUMMY_MESSAGES + 1
# define _DUMMY_MONETARY LC_MONETARY_INDEX
# else
# define _DUMMY_MONETARY _DUMMY_MESSAGES
# endif
# ifdef USE_LOCALE_ADDRESS
# define LC_ADDRESS_INDEX _DUMMY_MONETARY + 1
# define _DUMMY_ADDRESS LC_ADDRESS_INDEX
# else
# define _DUMMY_ADDRESS _DUMMY_MONETARY
# endif
# ifdef USE_LOCALE_IDENTIFICATION
# define LC_IDENTIFICATION_INDEX _DUMMY_ADDRESS + 1
# define _DUMMY_IDENTIFICATION LC_IDENTIFICATION_INDEX
# else
# define _DUMMY_IDENTIFICATION _DUMMY_ADDRESS
# endif
# ifdef USE_LOCALE_MEASUREMENT
# define LC_MEASUREMENT_INDEX _DUMMY_IDENTIFICATION + 1
# define _DUMMY_MEASUREMENT LC_MEASUREMENT_INDEX
# else
# define _DUMMY_MEASUREMENT _DUMMY_IDENTIFICATION
# endif
# ifdef USE_LOCALE_PAPER
# define LC_PAPER_INDEX _DUMMY_MEASUREMENT + 1
# define _DUMMY_PAPER LC_PAPER_INDEX
# else
# define _DUMMY_PAPER _DUMMY_MEASUREMENT
# endif
# ifdef USE_LOCALE_TELEPHONE
# define LC_TELEPHONE_INDEX _DUMMY_PAPER + 1
# define _DUMMY_TELEPHONE LC_TELEPHONE_INDEX
# else
# define _DUMMY_TELEPHONE _DUMMY_PAPER
# endif
# ifdef USE_LOCALE_SYNTAX
# define LC_SYNTAX_INDEX _DUMMY_TELEPHONE + 1
# define _DUMMY_SYNTAX LC_SYNTAX_INDEX
# else
# define _DUMMY_SYNTAX _DUMMY_TELEPHONE
# endif
# ifdef USE_LOCALE_TOD
# define LC_TOD_INDEX _DUMMY_SYNTAX + 1
# define _DUMMY_TOD LC_TOD_INDEX
# else
# define _DUMMY_TOD _DUMMY_SYNTAX
# endif
# ifdef LC_ALL
# define LC_ALL_INDEX _DUMMY_TOD + 1
# endif
#endif /* ifdef USE_LOCALE */
/* Windows requres a customized base-level setlocale() */
#ifdef WIN32
# define my_setlocale(cat, locale) win32_setlocale(cat, locale)
#else
# define my_setlocale(cat, locale) setlocale(cat, locale)
#endif
#ifndef USE_POSIX_2008_LOCALE
/* "do_setlocale_c" is intended to be called when the category is a constant
* known at compile time; "do_setlocale_r", not known until run time */
# define do_setlocale_c(cat, locale) my_setlocale(cat, locale)
# define do_setlocale_r(cat, locale) my_setlocale(cat, locale)
# define FIX_GLIBC_LC_MESSAGES_BUG(i)
#else /* Below uses POSIX 2008 */
/* We emulate setlocale with our own function. LC_foo is not valid for the
* POSIX 2008 functions. Instead LC_foo_MASK is used, which we use an array
* lookup to convert to. At compile time we have defined LC_foo_INDEX as the
* proper offset into the array 'category_masks[]'. At runtime, we have to
* search through the array (as the actual numbers may not be small contiguous
* positive integers which would lend themselves to array lookup). */
# define do_setlocale_c(cat, locale) \
emulate_setlocale(cat, locale, cat ## _INDEX, TRUE)
# define do_setlocale_r(cat, locale) emulate_setlocale(cat, locale, 0, FALSE)
# if ! defined(__GLIBC__) || ! defined(USE_LOCALE_MESSAGES)
# define FIX_GLIBC_LC_MESSAGES_BUG(i)
# else /* Invalidate glibc cache of loaded translations, see [perl #134264] */
# include <libintl.h>
# define FIX_GLIBC_LC_MESSAGES_BUG(i) \
STMT_START { \
if ((i) == LC_MESSAGES_INDEX) { \
textdomain(textdomain(NULL)); \
} \
} STMT_END
# endif
/* A third array, parallel to the ones above to map from category to its
* equivalent mask */
const int category_masks[] = {
# ifdef USE_LOCALE_NUMERIC
LC_NUMERIC_MASK,
# endif
# ifdef USE_LOCALE_CTYPE
LC_CTYPE_MASK,
# endif
# ifdef USE_LOCALE_COLLATE
LC_COLLATE_MASK,
# endif
# ifdef USE_LOCALE_TIME
LC_TIME_MASK,
# endif
# ifdef USE_LOCALE_MESSAGES
LC_MESSAGES_MASK,
# endif
# ifdef USE_LOCALE_MONETARY
LC_MONETARY_MASK,
# endif
# ifdef USE_LOCALE_ADDRESS
LC_ADDRESS_MASK,
# endif
# ifdef USE_LOCALE_IDENTIFICATION
LC_IDENTIFICATION_MASK,
# endif
# ifdef USE_LOCALE_MEASUREMENT
LC_MEASUREMENT_MASK,
# endif
# ifdef USE_LOCALE_PAPER
LC_PAPER_MASK,
# endif
# ifdef USE_LOCALE_TELEPHONE
LC_TELEPHONE_MASK,
# endif
# ifdef USE_LOCALE_SYNTAX
LC_SYNTAX_MASK,
# endif
# ifdef USE_LOCALE_TOD
LC_TOD_MASK,
# endif
/* LC_ALL can't be turned off by a Configure
* option, and in Posix 2008, should always be
* here, so compile it in unconditionally.
* This could catch some glitches at compile
* time */
LC_ALL_MASK
};
STATIC const char *
S_emulate_setlocale(const int category,
const char * locale,
unsigned int index,
const bool is_index_valid
)
{
/* This function effectively performs a setlocale() on just the current
* thread; thus it is thread-safe. It does this by using the POSIX 2008
* locale functions to emulate the behavior of setlocale(). Similar to
* regular setlocale(), the return from this function points to memory that
* can be overwritten by other system calls, so needs to be copied
* immediately if you need to retain it. The difference here is that
* system calls besides another setlocale() can overwrite it.
*
* By doing this, most locale-sensitive functions become thread-safe. The
* exceptions are mostly those that return a pointer to static memory.
*
* This function takes the same parameters, 'category' and 'locale', that
* the regular setlocale() function does, but it also takes two additional
* ones. This is because the 2008 functions don't use a category; instead
* they use a corresponding mask. Because this function operates in both
* worlds, it may need one or the other or both. This function can
* calculate the mask from the input category, but to avoid this
* calculation, if the caller knows at compile time what the mask is, it
* can pass it, setting 'is_index_valid' to TRUE; otherwise the mask
* parameter is ignored.
*
* POSIX 2008, for some sick reason, chose not to provide a method to find
* the category name of a locale. Some vendors have created a
* querylocale() function to do just that. This function is a lot simpler
* to implement on systems that have this. Otherwise, we have to keep
* track of what the locale has been set to, so that we can return its
* name to emulate setlocale(). It's also possible for C code in some
* library to change the locale without us knowing it, though as of
* September 2017, there are no occurrences in CPAN of uselocale(). Some
* libraries do use setlocale(), but that changes the global locale, and
* threads using per-thread locales will just ignore those changes.
* Another problem is that without querylocale(), we have to guess at what
* was meant by setting a locale of "". We handle this by not actually
* ever setting to "" (unless querylocale exists), but to emulate what we
* think should happen for "".
*/
int mask;
locale_t old_obj;
locale_t new_obj;
dTHX;
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale input=%d (%s), \"%s\", %d, %d\n", __FILE__, __LINE__, category, category_name(category), locale, index, is_index_valid);
}
# endif
/* If the input mask might be incorrect, calculate the correct one */
if (! is_index_valid) {
unsigned int i;
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: finding index of category %d (%s)\n", __FILE__, __LINE__, category, category_name(category));
}
# endif
for (i = 0; i <= LC_ALL_INDEX; i++) {
if (category == categories[i]) {
index = i;
goto found_index;
}
}
/* Here, we don't know about this category, so can't handle it.
* Fallback to the early POSIX usages */
Perl_warner(aTHX_ packWARN(WARN_LOCALE),
"Unknown locale category %d; can't set it to %s\n",
category, locale);
return NULL;
found_index: ;
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: index is %d for %s\n", __FILE__, __LINE__, index, category_name(category));
}
# endif
}
mask = category_masks[index];
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: category name is %s; mask is 0x%x\n", __FILE__, __LINE__, category_names[index], mask);
}
# endif
/* If just querying what the existing locale is ... */
if (locale == NULL) {
locale_t cur_obj = uselocale((locale_t) 0);
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale querying %p\n", __FILE__, __LINE__, cur_obj);
}
# endif
if (cur_obj == LC_GLOBAL_LOCALE) {
return my_setlocale(category, NULL);
}
# ifdef HAS_QUERYLOCALE
return (char *) querylocale(mask, cur_obj);
# else
/* If this assert fails, adjust the size of curlocales in intrpvar.h */
STATIC_ASSERT_STMT(C_ARRAY_LENGTH(PL_curlocales) > LC_ALL_INDEX);
# if defined(_NL_LOCALE_NAME) \
&& defined(DEBUGGING) \
/* On systems that accept any locale name, the real underlying \
* locale is often returned by this internal function, so we \
* can't use it */ \
&& ! defined(SETLOCALE_ACCEPTS_ANY_LOCALE_NAME)
{
/* Internal glibc for querylocale(), but doesn't handle
* empty-string ("") locale properly; who knows what other
* glitches. Check for it now, under debug. */
char * temp_name = nl_langinfo_l(_NL_LOCALE_NAME(category),
uselocale((locale_t) 0));
/*
PerlIO_printf(Perl_debug_log, "%s:%d: temp_name=%s\n", __FILE__, __LINE__, temp_name ? temp_name : "NULL");
PerlIO_printf(Perl_debug_log, "%s:%d: index=%d\n", __FILE__, __LINE__, index);
PerlIO_printf(Perl_debug_log, "%s:%d: PL_curlocales[index]=%s\n", __FILE__, __LINE__, PL_curlocales[index]);
*/
if (temp_name && PL_curlocales[index] && strNE(temp_name, "")) {
if ( strNE(PL_curlocales[index], temp_name)
&& ! ( isNAME_C_OR_POSIX(temp_name)
&& isNAME_C_OR_POSIX(PL_curlocales[index]))) {
# ifdef USE_C_BACKTRACE
dump_c_backtrace(Perl_debug_log, 20, 1);
# endif
Perl_croak(aTHX_ "panic: Mismatch between what Perl thinks %s is"
" (%s) and what internal glibc thinks"
" (%s)\n", category_names[index],
PL_curlocales[index], temp_name);
}
return temp_name;
}
}
# endif
/* Without querylocale(), we have to use our record-keeping we've
* done. */
if (category != LC_ALL) {
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale returning %s\n", __FILE__, __LINE__, PL_curlocales[index]);
}
# endif
return PL_curlocales[index];
}
else { /* For LC_ALL */
unsigned int i;
Size_t names_len = 0;
char * all_string;
bool are_all_categories_the_same_locale = TRUE;
/* If we have a valid LC_ALL value, just return it */
if (PL_curlocales[LC_ALL_INDEX]) {
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale returning %s\n", __FILE__, __LINE__, PL_curlocales[LC_ALL_INDEX]);
}
# endif
return PL_curlocales[LC_ALL_INDEX];
}
/* Otherwise, we need to construct a string of name=value pairs.
* We use the glibc syntax, like
* LC_NUMERIC=C;LC_TIME=en_US.UTF-8;...
* First calculate the needed size. Along the way, check if all
* the locale names are the same */
for (i = 0; i < LC_ALL_INDEX; i++) {
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale i=%d, name=%s, locale=%s\n", __FILE__, __LINE__, i, category_names[i], PL_curlocales[i]);
}
# endif
names_len += strlen(category_names[i])
+ 1 /* '=' */
+ strlen(PL_curlocales[i])
+ 1; /* ';' */
if (i > 0 && strNE(PL_curlocales[i], PL_curlocales[i-1])) {
are_all_categories_the_same_locale = FALSE;
}
}
/* If they are the same, we don't actually have to construct the
* string; we just make the entry in LC_ALL_INDEX valid, and be
* that single name */
if (are_all_categories_the_same_locale) {
PL_curlocales[LC_ALL_INDEX] = savepv(PL_curlocales[0]);
return PL_curlocales[LC_ALL_INDEX];
}
names_len++; /* Trailing '\0' */
SAVEFREEPV(Newx(all_string, names_len, char));
*all_string = '\0';
/* Then fill in the string */
for (i = 0; i < LC_ALL_INDEX; i++) {
# ifdef DEBUGGING
if (DEBUG_Lv_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale i=%d, name=%s, locale=%s\n", __FILE__, __LINE__, i, category_names[i], PL_curlocales[i]);
}
# endif
my_strlcat(all_string, category_names[i], names_len);
my_strlcat(all_string, "=", names_len);
my_strlcat(all_string, PL_curlocales[i], names_len);
my_strlcat(all_string, ";", names_len);
}
# ifdef DEBUGGING
if (DEBUG_L_TEST || debug_initialization) {
PerlIO_printf(Perl_debug_log, "%s:%d: emulate_setlocale returning %s\n", __FILE__, __LINE__, all_string);
}
#endif
return all_string;
}
# ifdef EINVAL
SETERRNO(EINVAL, LIB_INVARG);
# endif
return NULL;
# endif
} /* End of this being setlocale(LC_foo, NULL) */
/* Here, we are switching locales. */
# ifndef HAS_QUERYLOCALE
if (strEQ(locale, "")) {
/* For non-querylocale() systems, we do the setting of "" ourselves to
* be sure that we really know what's going on. We follow the Linux
* documented behavior (but if that differs from the actual behavior,
* this won't work exactly as the OS implements). We go out and
* examine the environment based on our understanding of how the system
* works, and use that to figure things out */
const char * const lc_all = PerlEnv_getenv("LC_ALL");
/* Use any "LC_ALL" environment variable, as it overrides everything
* else. */
if (lc_all && strNE(lc_all, "")) {
locale = lc_all;
}
else {
/* Otherwise, we need to dig deeper. Unless overridden, the
* default is the LANG environment variable; if it doesn't exist,
* then "C" */
const char * default_name;
default_name = PerlEnv_getenv("LANG");
if (! default_name || strEQ(default_name, "")) {
default_name = "C";
}
if (category != LC_ALL) {
const char * const name = PerlEnv_getenv(category_names[index]);
/* Here we are setting a single category. Assume will have the
* default name */
locale = default_name;
/* But then look for an overriding environment variable */
if (name && strNE(name, "")) {
locale = name;
}
}
else {
bool did_override = FALSE;
unsigned int i;
/* Here, we are getting LC_ALL. Any categories that don't have
* a corresponding environment variable set should be set to
* LANG, or to "C" if there is no LANG. If no individual
* categories differ from this, we can just set LC_ALL. This
* is buggy on systems that have extra categories that we don't
* know about. If there is an environment variable that sets
* that category, we won't know to look for it, and so our use
* of LANG or "C" improperly overrides it. On the other hand,
* if we don't do what is done here, and there is no
* environment variable, the category's locale should be set to
* LANG or "C". So there is no good solution. khw thinks the
* best is to look at systems to see what categories they have,
* and include them, and then to assume that we know the
* complete set */
for (i = 0; i < LC_ALL_INDEX; i++) {
const char * const env_override
= PerlEnv_getenv(category_names[i]);
const char * this_locale = ( env_override
&& strNE(env_override, ""))
? env_override
: default_name;
if (! emulate_setlocale(categories[i], this_locale, i, TRUE))
{
return NULL;
}
if (strNE(this_locale, default_name)) {
did_override = TRUE;
}
}
/* If all the categories are the same, we can set LC_ALL to
* that */
if (! did_override) {
locale = default_name;
}
else {
/* Here, LC_ALL is no longer valid, as some individual
* categories don't match it. We call ourselves
* recursively, as that will execute the code that
* generates the proper locale string for this situation.
* We don't do the remainder of this function, as that is
* to update our records, and we've just done that for the
* individual categories in the loop above, and doing so
* would cause LC_ALL to be done as well */
return emulate_setlocale(LC_ALL, NULL, LC_ALL_INDEX, TRUE);
}
}
}
} /* End of this being setlocale(LC_foo, "") */
else if (strchr(locale, ';')) {
/* LC_ALL may actually incude a conglomeration of various categories.
* Without querylocale, this code uses the glibc (as of this writing)
* syntax for representing that, but that is not a stable API, and
* other platforms do it differently, so we have to handle all cases
* ourselves */
unsigned int i;
const char * s = locale;
const char * e = locale + strlen(locale);
const char * p = s;
const char * category_end;
const char * name_start;
const char * name_end;
/* If the string that gives what to set doesn't include all categories,
* the omitted ones get set to "C". To get this behavior, first set
* all the individual categories to "C", and override the furnished
* ones below */
for (i = 0; i < LC_ALL_INDEX; i++) {
if (! emulate_setlocale(categories[i], "C", i, TRUE)) {
return NULL;
}
}
while (s < e) {
/* Parse through the category */
while (isWORDCHAR(*p)) {
p++;
}
category_end = p;
if (*p++ != '=') {
Perl_croak(aTHX_
"panic: %s: %d: Unexpected character in locale name '%02X",
__FILE__, __LINE__, *(p-1));
}
/* Parse through the locale name */
name_start = p;
while (p < e && *p != ';') {
if (! isGRAPH(*p)) {
Perl_croak(aTHX_
"panic: %s: %d: Unexpected character in locale name '%02X",
__FILE__, __LINE__, *(p-1));
}
p++;
}
name_end = p;
/* Space past the semi-colon */
if (p < e) {
p++;
}
/* Find the index of the category name in our lists */
for (i = 0; i < LC_ALL_INDEX; i++) {
char * individ_locale;
/* Keep going if this isn't the index. The strnNE() avoids a
* Perl_form(), but would fail if ever a category name could be
* a substring of another one, like if there were a
* "LC_TIME_DATE" */
if strnNE(s, category_names[i], category_end - s) {
continue;
}
/* If this index is for the single category we're changing, we
* have found the locale to set it to. */
if (category == categories[i]) {
locale = Perl_form(aTHX_ "%.*s",
(int) (name_end - name_start),
name_start);
goto ready_to_set;
}
assert(category == LC_ALL);
individ_locale = Perl_form(aTHX_ "%.*s",
(int) (name_end - name_start), name_start);
if (! emulate_setlocale(categories[i], individ_locale, i, TRUE))
{
return NULL;
}
}
s = p;
}
/* Here we have set all the individual categories by recursive calls.
* These collectively should have fixed up LC_ALL, so can just query
* what that now is */
assert(category == LC_ALL);
return do_setlocale_c(LC_ALL, NULL);
} /* End of this being setlocale(LC_ALL,
"LC_CTYPE=foo;LC_NUMERIC=bar;...") */
ready_to_set: ;
/* Here at the end of having to deal with the absence of querylocale().
* Some cases have already been fully handled by recursive calls to this
* function. But at this point, we haven't dealt with those, but are now
* prepared to, knowing what the locale name to set this category to is.