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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.
*/

#include "EXTERN.h"
#define PERL_IN_LOCALE_C
#include "perl.h"

#ifdef I_LANGINFO
# include <langinfo.h>
#endif

#include "reentr.h"

#if defined(USE_LOCALE_NUMERIC) || defined(USE_LOCALE_COLLATE)
/*
* Standardize the locale name from a string returned by 'setlocale'.
*
* The standard 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)
*
* 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().
*
*/
STATIC char *
S_stdize_locale(pTHX_ char *locs)
{
    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;
}
#endif

void
Perl_set_numeric_radix(pTHX)
{
#ifdef USE_LOCALE_NUMERIC
    dVAR;
# ifdef HAS_LOCALECONV
    const struct lconv* const lc = localeconv();

    if (lc && lc->decimal_point) {
if (lc->decimal_point[0] == '.' && lc->decimal_point[1] == 0) {
SvREFCNT_dec(PL_numeric_radix_sv);
PL_numeric_radix_sv = NULL;
}
else {
if (PL_numeric_radix_sv)
sv_setpv(PL_numeric_radix_sv, lc->decimal_point);
else
PL_numeric_radix_sv = newSVpv(lc->decimal_point, 0);
}
    }
    else
PL_numeric_radix_sv = NULL;
# endif /* HAS_LOCALECONV */
#endif /* USE_LOCALE_NUMERIC */
}

/*
* Set up for a new numeric locale.
*/
void
Perl_new_numeric(pTHX_ const char *newnum)
{
#ifdef USE_LOCALE_NUMERIC
    dVAR;

    if (! newnum) {
Safefree(PL_numeric_name);
PL_numeric_name = NULL;
PL_numeric_standard = TRUE;
PL_numeric_local = TRUE;
return;
    }

    if (! PL_numeric_name || strNE(PL_numeric_name, newnum)) {
Safefree(PL_numeric_name);
PL_numeric_name = stdize_locale(savepv(newnum));
PL_numeric_standard = ((*newnum == 'C' && newnum[1] == '\0')
|| strEQ(newnum, "POSIX"));
PL_numeric_local = TRUE;
set_numeric_radix();
    }

#endif /* USE_LOCALE_NUMERIC */
}

void
Perl_set_numeric_standard(pTHX)
{
#ifdef USE_LOCALE_NUMERIC
    dVAR;

    if (! PL_numeric_standard) {
setlocale(LC_NUMERIC, "C");
PL_numeric_standard = TRUE;
PL_numeric_local = FALSE;
set_numeric_radix();
    }

#endif /* USE_LOCALE_NUMERIC */
}

void
Perl_set_numeric_local(pTHX)
{
#ifdef USE_LOCALE_NUMERIC
    dVAR;

    if (! PL_numeric_local) {
setlocale(LC_NUMERIC, PL_numeric_name);
PL_numeric_standard = FALSE;
PL_numeric_local = TRUE;
set_numeric_radix();
    }

#endif /* USE_LOCALE_NUMERIC */
}

/*
* Set up for a new ctype locale.
*/
void
Perl_new_ctype(pTHX_ const char *newctype)
{
#ifdef USE_LOCALE_CTYPE
    dVAR;
    int i;

    PERL_ARGS_ASSERT_NEW_CTYPE;

    for (i = 0; i < 256; i++) {
if (isUPPER_LC(i))
PL_fold_locale[i] = toLOWER_LC(i);
else if (isLOWER_LC(i))
PL_fold_locale[i] = toUPPER_LC(i);
else
PL_fold_locale[i] = i;
    }

#endif /* USE_LOCALE_CTYPE */
    PERL_ARGS_ASSERT_NEW_CTYPE;
    PERL_UNUSED_ARG(newctype);
    PERL_UNUSED_CONTEXT;
}

/*
* Set up for a new collation locale.
*/
void
Perl_new_collate(pTHX_ const char *newcoll)
{
#ifdef USE_LOCALE_COLLATE
    dVAR;

    if (! newcoll) {
if (PL_collation_name) {
++PL_collation_ix;
Safefree(PL_collation_name);
PL_collation_name = NULL;
}
PL_collation_standard = TRUE;
PL_collxfrm_base = 0;
PL_collxfrm_mult = 2;
return;
    }

    if (! PL_collation_name || strNE(PL_collation_name, newcoll)) {
++PL_collation_ix;
Safefree(PL_collation_name);
PL_collation_name = stdize_locale(savepv(newcoll));
PL_collation_standard = ((*newcoll == 'C' && newcoll[1] == '\0')
|| strEQ(newcoll, "POSIX"));

{
/* 2: at most so many chars ('a', 'b'). */
/* 50: surely no system expands a char more. */
#define XFRMBUFSIZE (2 * 50)
char xbuf[XFRMBUFSIZE];
const Size_t fa = strxfrm(xbuf, "a", XFRMBUFSIZE);
const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
const SSize_t mult = fb - fa;
if (mult < 1 && !(fa == 0 && fb == 0))
Perl_croak(aTHX_ "panic: strxfrm() gets absurd - a => %"UVuf", ab => %"UVuf,
(UV) fa, (UV) fb);
PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0;
PL_collxfrm_mult = mult;
}
    }

#endif /* USE_LOCALE_COLLATE */
}

/*
* Initialize locale awareness.
*/
int
Perl_init_i18nl10n(pTHX_ int printwarn)
{
    int ok = 1;
    /* returns
* 1 = set ok or not applicable,
* 0 = fallback to C locale,
* -1 = fallback to C locale failed
*/

#if defined(USE_LOCALE)
    dVAR;

#ifdef USE_LOCALE_CTYPE
    char *curctype = NULL;
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
    char *curcoll = NULL;
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
    char *curnum = NULL;
#endif /* USE_LOCALE_NUMERIC */
#ifdef __GLIBC__
    char * const language = PerlEnv_getenv("LANGUAGE");
#endif
    char * const lc_all = PerlEnv_getenv("LC_ALL");
    char * const lang = PerlEnv_getenv("LANG");
    bool setlocale_failure = FALSE;

#ifdef LOCALE_ENVIRON_REQUIRED

    /*
* Ultrix setlocale(..., "") fails if there are no environment
* variables from which to get a locale name.
*/

    bool done = FALSE;

#ifdef LC_ALL
    if (lang) {
if (setlocale(LC_ALL, ""))
done = TRUE;
else
setlocale_failure = TRUE;
    }
    if (!setlocale_failure) {
#ifdef USE_LOCALE_CTYPE
Safefree(curctype);
if (! (curctype =
setlocale(LC_CTYPE,
(!done && (lang || PerlEnv_getenv("LC_CTYPE")))
? "" : NULL)))
setlocale_failure = TRUE;
else
curctype = savepv(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
Safefree(curcoll);
if (! (curcoll =
setlocale(LC_COLLATE,
(!done && (lang || PerlEnv_getenv("LC_COLLATE")))
? "" : NULL)))
setlocale_failure = TRUE;
else
curcoll = savepv(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
Safefree(curnum);
if (! (curnum =
setlocale(LC_NUMERIC,
(!done && (lang || PerlEnv_getenv("LC_NUMERIC")))
? "" : NULL)))
setlocale_failure = TRUE;
else
curnum = savepv(curnum);
#endif /* USE_LOCALE_NUMERIC */
    }

#endif /* LC_ALL */

#endif /* !LOCALE_ENVIRON_REQUIRED */

#ifdef LC_ALL
    if (! setlocale(LC_ALL, ""))
setlocale_failure = TRUE;
#endif /* LC_ALL */

    if (!setlocale_failure) {
#ifdef USE_LOCALE_CTYPE
Safefree(curctype);
if (! (curctype = setlocale(LC_CTYPE, "")))
setlocale_failure = TRUE;
else
curctype = savepv(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
Safefree(curcoll);
if (! (curcoll = setlocale(LC_COLLATE, "")))
setlocale_failure = TRUE;
else
curcoll = savepv(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
Safefree(curnum);
if (! (curnum = setlocale(LC_NUMERIC, "")))
setlocale_failure = TRUE;
else
curnum = savepv(curnum);
#endif /* USE_LOCALE_NUMERIC */
    }

    if (setlocale_failure) {
char *p;
const bool locwarn = (printwarn > 1 ||
(printwarn &&
(!(p = PerlEnv_getenv("PERL_BADLANG")) || atoi(p))));

if (locwarn) {
#ifdef LC_ALL

PerlIO_printf(Perl_error_log,
"perl: warning: Setting locale failed.\n");

#else /* !LC_ALL */

PerlIO_printf(Perl_error_log,
"perl: warning: Setting locale failed for the categories:\n\t");
#ifdef USE_LOCALE_CTYPE
if (! curctype)
PerlIO_printf(Perl_error_log, "LC_CTYPE ");
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
if (! curcoll)
PerlIO_printf(Perl_error_log, "LC_COLLATE ");
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
if (! curnum)
PerlIO_printf(Perl_error_log, "LC_NUMERIC ");
#endif /* USE_LOCALE_NUMERIC */
PerlIO_printf(Perl_error_log, "\n");

#endif /* LC_ALL */

PerlIO_printf(Perl_error_log,
"perl: warning: Please check that your locale settings:\n");

#ifdef __GLIBC__
PerlIO_printf(Perl_error_log,
"\tLANGUAGE = %c%s%c,\n",
language ? '"' : '(',
language ? language : "unset",
language ? '"' : ')');
#endif

PerlIO_printf(Perl_error_log,
"\tLC_ALL = %c%s%c,\n",
lc_all ? '"' : '(',
lc_all ? lc_all : "unset",
lc_all ? '"' : ')');

#if defined(USE_ENVIRON_ARRAY)
{
char **e;
for (e = environ; *e; e++) {
if (strnEQ(*e, "LC_", 3)
&& strnNE(*e, "LC_ALL=", 7)
&& (p = strchr(*e, '=')))
PerlIO_printf(Perl_error_log, "\t%.*s = \"%s\",\n",
(int)(p - *e), *e, p + 1);
}
}
#else
PerlIO_printf(Perl_error_log,
"\t(possibly more locale environment variables)\n");
#endif

PerlIO_printf(Perl_error_log,
"\tLANG = %c%s%c\n",
lang ? '"' : '(',
lang ? lang : "unset",
lang ? '"' : ')');

PerlIO_printf(Perl_error_log,
" are supported and installed on your system.\n");
}

#ifdef LC_ALL

if (setlocale(LC_ALL, "C")) {
if (locwarn)
PerlIO_printf(Perl_error_log,
      "perl: warning: Falling back to the standard locale (\"C\").\n");
ok = 0;
}
else {
if (locwarn)
PerlIO_printf(Perl_error_log,
      "perl: warning: Failed to fall back to the standard locale (\"C\").\n");
ok = -1;
}

#else /* ! LC_ALL */

if (0
#ifdef USE_LOCALE_CTYPE
|| !(curctype || setlocale(LC_CTYPE, "C"))
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
|| !(curcoll || setlocale(LC_COLLATE, "C"))
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
|| !(curnum || setlocale(LC_NUMERIC, "C"))
#endif /* USE_LOCALE_NUMERIC */
)
{
if (locwarn)
PerlIO_printf(Perl_error_log,
      "perl: warning: Cannot fall back to the standard locale (\"C\").\n");
ok = -1;
}

#endif /* ! LC_ALL */

#ifdef USE_LOCALE_CTYPE
Safefree(curctype);
curctype = savepv(setlocale(LC_CTYPE, NULL));
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
Safefree(curcoll);
curcoll = savepv(setlocale(LC_COLLATE, NULL));
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
Safefree(curnum);
curnum = savepv(setlocale(LC_NUMERIC, NULL));
#endif /* USE_LOCALE_NUMERIC */
    }
    else {

#ifdef USE_LOCALE_CTYPE
    new_ctype(curctype);
#endif /* USE_LOCALE_CTYPE */

#ifdef USE_LOCALE_COLLATE
    new_collate(curcoll);
#endif /* USE_LOCALE_COLLATE */

#ifdef USE_LOCALE_NUMERIC
    new_numeric(curnum);
#endif /* USE_LOCALE_NUMERIC */

    }

#endif /* USE_LOCALE */

#ifdef USE_PERLIO
    {
      /* Set PL_utf8locale to TRUE if using PerlIO _and_
any of the following are true:
- nl_langinfo(CODESET) contains /^utf-?8/i
- $ENV{LC_ALL} contains /^utf-?8/i
- $ENV{LC_CTYPE} contains /^utf-?8/i
- $ENV{LANG} contains /^utf-?8/i
The LC_ALL, LC_CTYPE, LANG obey the usual override
hierarchy of locale environment variables. (LANGUAGE
affects only LC_MESSAGES only under glibc.) (If present,
it overrides LC_MESSAGES for GNU gettext, and it also
can have more than one locale, separated by spaces,
in case you need to know.)
If PL_utf8locale and PL_unicode (set by -C or by $ENV{PERL_UNICODE})
are true, perl.c:S_parse_body() will turn on the PerlIO :utf8 layer
on STDIN, STDOUT, STDERR, _and_ the default open discipline.
*/
bool utf8locale = FALSE;
char *codeset = NULL;
#if defined(HAS_NL_LANGINFO) && defined(CODESET)
codeset = nl_langinfo(CODESET);
#endif
if (codeset)
utf8locale = (foldEQ(codeset, STR_WITH_LEN("UTF-8"))
|| foldEQ(codeset, STR_WITH_LEN("UTF8") ));
#if defined(USE_LOCALE)
else { /* nl_langinfo(CODESET) is supposed to correctly
* interpret the locale environment variables,
* but just in case it fails, let's do this manually. */
if (lang)
utf8locale = (foldEQ(lang, STR_WITH_LEN("UTF-8"))
|| foldEQ(lang, STR_WITH_LEN("UTF8") ));
#ifdef USE_LOCALE_CTYPE
if (curctype)
utf8locale = (foldEQ(curctype, STR_WITH_LEN("UTF-8"))
|| foldEQ(curctype, STR_WITH_LEN("UTF8") ));
#endif
if (lc_all)
utf8locale = (foldEQ(lc_all, STR_WITH_LEN("UTF-8"))
|| foldEQ(lc_all, STR_WITH_LEN("UTF8") ));
}
#endif /* USE_LOCALE */
if (utf8locale)
PL_utf8locale = TRUE;
    }
    /* Set PL_unicode to $ENV{PERL_UNICODE} if using PerlIO.
This is an alternative to using the -C command line switch
(the -C if present will override this). */
    {
const char *p = PerlEnv_getenv("PERL_UNICODE");
PL_unicode = p ? parse_unicode_opts(&p) : 0;
if (PL_unicode & PERL_UNICODE_UTF8CACHEASSERT_FLAG)
PL_utf8cache = -1;
    }
#endif

#ifdef USE_LOCALE_CTYPE
    Safefree(curctype);
#endif /* USE_LOCALE_CTYPE */
#ifdef USE_LOCALE_COLLATE
    Safefree(curcoll);
#endif /* USE_LOCALE_COLLATE */
#ifdef USE_LOCALE_NUMERIC
    Safefree(curnum);
#endif /* USE_LOCALE_NUMERIC */
    return ok;
}

#ifdef USE_LOCALE_COLLATE

/*
* mem_collxfrm() is a bit like strxfrm() but with two important
* differences. First, it handles embedded NULs. Second, it allocates
* a bit more memory than needed for the transformed data itself.
* The real transformed data begins at offset sizeof(collationix).
* Please see sv_collxfrm() to see how this is used.
*/

char *
Perl_mem_collxfrm(pTHX_ const char *s, STRLEN len, STRLEN *xlen)
{
    dVAR;
    char *xbuf;
    STRLEN xAlloc, xin, xout; /* xalloc is a reserved word in VC */

    PERL_ARGS_ASSERT_MEM_COLLXFRM;

    /* the first sizeof(collationix) bytes are used by sv_collxfrm(). */
    /* the +1 is for the terminating NUL. */

    xAlloc = sizeof(PL_collation_ix) + PL_collxfrm_base + (PL_collxfrm_mult * len) + 1;
    Newx(xbuf, xAlloc, char);
    if (! xbuf)
goto bad;

    *(U32*)xbuf = PL_collation_ix;
    xout = sizeof(PL_collation_ix);
    for (xin = 0; xin < len; ) {
Size_t xused;

for (;;) {
xused = strxfrm(xbuf + xout, s + xin, xAlloc - xout);
if (xused >= PERL_INT_MAX)
goto bad;
if ((STRLEN)xused < xAlloc - xout)
break;
xAlloc = (2 * xAlloc) + 1;
Renew(xbuf, xAlloc, char);
if (! xbuf)
goto bad;
}

xin += strlen(s + xin) + 1;
xout += xused;

/* Embedded NULs are understood but silently skipped
* because they make no sense in locale collation. */
    }

    xbuf[xout] = '\0';
    *xlen = xout - sizeof(PL_collation_ix);
    return xbuf;

  bad:
    Safefree(xbuf);
    *xlen = 0;
    return NULL;
}

#endif /* USE_LOCALE_COLLATE */

/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*
* ex: set ts=8 sts=4 sw=4 et:
*/
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