* environ.cc (regopt): Change the first argument to wide char string.

[pf3gnuchains/pf3gnuchains4x.git] / winsup / cygwin / nlsfuncs.cc

/* nlsfuncs.cc: NLS helper functions

   Copyright 2010 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#include "winsup.h"
#include <winnls.h>
#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <wchar.h>
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "tls_pbuf.h"
/* Internal headers from newlib */
#include "../locale/timelocal.h"
#include "../locale/lctype.h"
#include "../locale/lnumeric.h"
#include "../locale/lmonetary.h"
#include "../locale/lmessages.h"
#include "lc_msg.h"
#include "lc_era.h"

#define _LC(x)  &lc_##x##_ptr,lc_##x##_end-lc_##x##_ptr

#define getlocaleinfo(category,type) \
            __getlocaleinfo(lcid,(type),_LC(category))
#define eval_datetimefmt(type,flags) \
            __eval_datetimefmt(lcid,(type),(flags),&lc_time_ptr,\
                               lc_time_end-lc_time_ptr)
#define charfromwchar(category,in) \
            __charfromwchar (_##category##_locale->in,_LC(category),\
                             f_wctomb,charset)

#define has_modifier(x) ((x)[0] && !strcmp (modifier, (x)))

/* Vista and later.  Not defined in w32api yet. */
extern "C" {
WINBASEAPI LCID WINAPI LocaleNameToLCID (LPCWSTR, DWORD);
};

static char last_locale[ENCODING_LEN + 1];
static LCID last_lcid;

/* Fetch LCID from POSIX locale specifier.
   Return values:

     -1: Invalid locale
      0: C or POSIX
     >0: LCID
*/
static LCID
__get_lcid_from_locale (const char *name)
{
  char locale[ENCODING_LEN + 1];
  char *c;
  LCID lcid;

  /* Speed up reusing the same locale as before, for instance in LC_ALL case. */
  if (!strcmp (name, last_locale))
    {
      debug_printf ("LCID=0x%04x", last_lcid);
      return last_lcid;
    }
  stpcpy (last_locale, name);
  stpcpy (locale, name);
  /* Store modifier for later use. */
  const char *modifier = strchr (last_locale, '@') ? : "";
  /* Drop charset and modifier */
  c = strchr (locale, '.');
  if (!c)
    c = strchr (locale, '@');
  if (c)
    *c = '\0';
  /* "POSIX" already converted to "C" in loadlocale. */
  if (!strcmp (locale, "C"))
    return last_lcid = 0;
  c = strchr (locale, '_');
  if (!c)
    return last_lcid = (LCID) -1;
  if (wincap.has_localenames ())
    {
      wchar_t wlocale[ENCODING_LEN + 1];

      /* Convert to RFC 4646 syntax which is the standard for the locale names
         replacing LCIDs starting with Vista. */
      *c = '-';
      mbstowcs (wlocale, locale, ENCODING_LEN + 1);
      lcid = LocaleNameToLCID (wlocale, 0);
      if (lcid == 0)
        {
          /* Unfortunately there are a couple of locales for which no form
             without a Script part per RFC 4646 exists.
             Linux also supports no_NO which is equivalent to nb_NO. */
          struct {
            const char    *loc;
            const wchar_t *wloc;
          } sc_only_locale[] = {
            { "az-AZ" , L"az-Latn-AZ"  },
            { "bs-BA" , L"bs-Latn-BA"  },
            { "ha-NG" , L"ha-Latn-NG"  },
            { "iu-CA" , L"iu-Latn-CA"  },
            { "mn-CN" , L"mn-Mong-CN"  },
            { "no-NO" , L"nb-NO"       },
            { "sr-BA" , L"sr-Cyrl-BA"  },
            { "sr-CS" , L"sr-Cyrl-CS"  },
            { "sr-ME" , L"sr-Cyrl-ME"  },
            { "sr-RS" , L"sr-Cyrl-RS"  },
            { "tg-TJ" , L"tg-Cyrl-TJ"  },
            { "tzm-DZ", L"tzm-Latn-DZ" },
            { "uz-UZ" , L"uz-Latn-UZ"  },
            { NULL    , NULL          }
          };
          for (int i = 0; sc_only_locale[i].loc
                          && sc_only_locale[i].loc[0] <= locale[0]; ++i)
            if (!strcmp (locale, sc_only_locale[i].loc))
              {
                lcid = LocaleNameToLCID (sc_only_locale[i].wloc, 0);
                if (!strncmp (locale, "sr-", 3))
                  {
                    /* Vista/2K8 is missing sr-ME and sr-RS.  It has only the
                       deprecated sr-CS.  So we map ME and RS to CS here. */
                    if (lcid == 0)
                      lcid = LocaleNameToLCID (L"sr-Cyrl-CS", 0);
                    /* "@latin" modifier for the sr_XY locales changes
                        collation behaviour so lcid should accommodate that
                        by being set to the Latin sublang. */
                    if (lcid != 0 && has_modifier ("@latin"))
                      lcid = MAKELANGID (lcid & 0x3ff, (lcid >> 10) - 1);
                  }
                else if (!strncmp (locale, "uz-", 3))
                  {
                    /* Equivalent for "@cyrillic" modifier in uz_UZ locale */
                    if (lcid != 0 && has_modifier ("@cyrillic"))
                      lcid = MAKELANGID (lcid & 0x3ff, (lcid >> 10) + 1);
                  }
                break;
              }
        }
      last_lcid = lcid ?: (LCID) -1;
      debug_printf ("LCID=0x%04x", last_lcid);
      return last_lcid;
    }
  /* Pre-Vista we have to loop through the LCID values and see if they
     match language and TERRITORY. */
  *c++ = '\0';
  /* locale now points to the language, c points to the TERRITORY */
  const char *language = locale;
  const char *territory = c;
  LCID lang, sublang;
  char iso[10];

  /* In theory the lang part takes 10 bits (0x3ff), but up to Windows 2003 R2
     the highest lang value is 0x81. */
  for (lang = 1; lang <= 0x81; ++lang)
    if (GetLocaleInfo (lang, LOCALE_SISO639LANGNAME, iso, 10)
        && !strcmp (language, iso))
      break;
  if (lang > 0x81)
    lcid = 0;
  else if (!territory)
    lcid = lang;
  else
    {
      /* In theory the sublang part takes 7 bits (0x3f), but up to
         Windows 2003 R2 the highest sublang value is 0x14. */
      for (sublang = 1; sublang <= 0x14; ++sublang)
        {
          lcid = (sublang << 10) | lang;
          if (GetLocaleInfo (lcid, LOCALE_SISO3166CTRYNAME, iso, 10)
              && !strcmp (territory, iso))
            break;
        }
      if (sublang > 0x14)
        lcid = 0;
    }
  if (lcid == 0 && territory)
    {
      /* Unfortunately there are four language LCID number areas representing
         multiple languages.  Fortunately only two of them already existed
         pre-Vista.  The concealed languages have to be tested explicitly,
         since they are not catched by the above loops.
         This also enables the serbian ISO 3166 territory codes which have
         been changed post 2003, and maps them to the old wrong (SP was never
         a valid ISO 3166 code) territory code sr_SP which fortunately has the
         same LCID as the newer sr_CS.
         Linux also supports no_NO which is equivalent to nb_NO. */
      struct {
        const char *loc;
        LCID        lcid;
      } ambiguous_locale[] = {
        { "bs_BA", MAKELANGID (LANG_BOSNIAN, 0x05)                          },
        { "nn_NO", MAKELANGID (LANG_NORWEGIAN, SUBLANG_NORWEGIAN_NYNORSK)   },
        { "no_NO", MAKELANGID (LANG_NORWEGIAN, SUBLANG_NORWEGIAN_BOKMAL)    },
        { "sr_BA", MAKELANGID (LANG_BOSNIAN,
                               SUBLANG_SERBIAN_BOSNIA_HERZEGOVINA_CYRILLIC) },
        { "sr_CS", MAKELANGID (LANG_SERBIAN, SUBLANG_SERBIAN_CYRILLIC)      },
        { "sr_ME", MAKELANGID (LANG_SERBIAN, SUBLANG_SERBIAN_CYRILLIC)      },
        { "sr_RS", MAKELANGID (LANG_SERBIAN, SUBLANG_SERBIAN_CYRILLIC)      },
        { "sr_SP", MAKELANGID (LANG_SERBIAN, SUBLANG_SERBIAN_CYRILLIC)      },
        { NULL,    0 },
      };
      *--c = '_';
      for (int i = 0; ambiguous_locale[i].loc
                      && ambiguous_locale[i].loc[0] <= locale[0]; ++i)
        if (!strcmp (locale, ambiguous_locale[i].loc)
            && GetLocaleInfo (ambiguous_locale[i].lcid, LOCALE_SISO639LANGNAME,
                              iso, 10))
          {
            lcid = ambiguous_locale[i].lcid;
            /* "@latin" modifier for the sr_XY locales changes collation
               behaviour so lcid should accommodate that by being set to
               the Latin sublang. */
            if (!strncmp (locale, "sr_", 3) && has_modifier ("@latin"))
              lcid = MAKELANGID (lcid & 0x3ff, (lcid >> 10) - 1);
            break;
          }
    }
  else if (lcid == 0x0443)              /* uz_UZ (Uzbek/Uzbekistan) */
    {
      /* Equivalent for "@cyrillic" modifier in uz_UZ locale */
      if (lcid != 0 && has_modifier ("@cyrillic"))
        lcid = MAKELANGID (lcid & 0x3ff, (lcid >> 10) + 1);
    }
  last_lcid = lcid ?: (LCID) -1;
  debug_printf ("LCID=0x%04x", last_lcid);
  return last_lcid;
}

/* Never returns -1.  Just skips invalid chars instead.  Only if return_invalid
   is set, s==NULL returns -1 since then it's used to recognize invalid strings
   in the used charset. */
static size_t
lc_wcstombs (wctomb_p f_wctomb, const char *charset,
             char *s, const wchar_t *pwcs, size_t n,
             bool return_invalid = false)
{
  char *ptr = s;
  size_t max = n;
  char buf[8];
  size_t i, bytes, num_to_copy;
  mbstate_t state;

  memset (&state, 0, sizeof state);
  if (s == NULL)
    {
      size_t num_bytes = 0;
      while (*pwcs != 0)
        {
          bytes = f_wctomb (_REENT, buf, *pwcs++, charset, &state);
          if (bytes != (size_t) -1)
            num_bytes += bytes;
          else if (return_invalid)
            return (size_t) -1;
        }
      return num_bytes;
    }
  while (n > 0)
    {
      bytes = f_wctomb (_REENT, buf, *pwcs, charset, &state);
      if (bytes == (size_t) -1)
        {
          memset (&state, 0, sizeof state);
          ++pwcs;
          continue;
        }
      num_to_copy = (n > bytes ? bytes : n);
      for (i = 0; i < num_to_copy; ++i)
        *ptr++ = buf[i];

      if (*pwcs == 0x00)
        return ptr - s - (n >= bytes);
      ++pwcs;
      n -= num_to_copy;
    }
  return max;
}

/* Never returns -1.  Invalid sequences are translated to replacement
   wide-chars. */
static size_t
lc_mbstowcs (mbtowc_p f_mbtowc, const char *charset,
             wchar_t *pwcs, const char *s, size_t n)
{
  size_t ret = 0;
  char *t = (char *) s;
  size_t bytes;
  mbstate_t state;

  memset (&state, 0, sizeof state);
  if (!pwcs)
    n = 1;
  while (n > 0)
    {
      bytes = f_mbtowc (_REENT, pwcs, t, 6 /* fake, always enough */,
                        charset, &state);
      if (bytes == (size_t) -1)
        {
          state.__count = 0;
          bytes = 1;
          if (pwcs)
            *pwcs = L' ';
        }
      else if (bytes == 0)
        break;
      t += bytes;
      ++ret;
      if (pwcs)
        {
          ++pwcs;
          --n;
        }
    }
  return ret;
}

static int
locale_cmp (const void *a, const void *b)
{
  char **la = (char **) a;
  char **lb = (char **) b;
  return strcmp (*la, *lb);
}

/* Helper function to workaround reallocs which move blocks even if they shrink.
   Cygwin's realloc is not doing this, but tcsh's, for instance.  All lc_foo
   structures consist entirely of pointers so they are practically pointer
   arrays.  What we do here is just treat the lc_foo pointers as char ** and
   rebase all char * pointers within, up to the given size of the structure. */
static void
rebase_locale_buf (const void *ptrv, const char *newbase, const char *oldbase,
                   const void *ptrvend)
{
  const char **ptrs = (const char **) ptrv;
  const char **ptrsend = (const char **) ptrvend;
  while (ptrs < ptrsend)
    *ptrs++ += newbase - oldbase;
}

static wchar_t *
__getlocaleinfo (LCID lcid, LCTYPE type, char **ptr, size_t size)
{
  size_t num;
  wchar_t *ret;

  if ((uintptr_t) *ptr % 1)
    ++*ptr;
  ret = (wchar_t *) *ptr;
  num = GetLocaleInfoW (lcid, type, ret, size / sizeof (wchar_t));
  *ptr = (char *) (ret + num);
  return ret;
}

static char *
__charfromwchar (const wchar_t *in, char **ptr, size_t size,
                 wctomb_p f_wctomb, const char *charset)
{
  size_t num;
  char *ret;

  num = lc_wcstombs (f_wctomb, charset, ret = *ptr, in, size);
  *ptr += num + 1;
  return ret;
}

static UINT
getlocaleint (LCID lcid, LCTYPE type)
{
  UINT val;
  return GetLocaleInfoW (lcid, type | LOCALE_RETURN_NUMBER, (PWCHAR) &val,
                         sizeof val) ? val : 0;
}

enum dt_flags {
  DT_DEFAULT    = 0x00,
  DT_AMPM       = 0x01, /* Enforce 12 hour time format. */
  DT_ABBREV     = 0x02, /* Enforce abbreviated month and day names. */
};

static wchar_t *
__eval_datetimefmt (LCID lcid, LCTYPE type, dt_flags flags, char **ptr,
                    size_t size)
{
  wchar_t buf[80];
  wchar_t fc;
  size_t idx;
  const wchar_t *day_str = L"edaA";
  const wchar_t *mon_str = L"mmbB";
  const wchar_t *year_str = L"yyyY";
  const wchar_t *hour12_str = L"lI";
  const wchar_t *hour24_str = L"kH";
  const wchar_t *t_str;

  if ((uintptr_t) *ptr % 1)
    ++*ptr;
  wchar_t *ret = (wchar_t *) *ptr;
  wchar_t *p = (wchar_t *) *ptr;
  GetLocaleInfoW (lcid, type, buf, 80);
  for (wchar_t *fmt = buf; *fmt; ++fmt)
    switch (fc = *fmt)
      {
      case L'\'':
        if (fmt[1] == L'\'')
          *p++ = L'\'';
        else
          while (fmt[1] && *++fmt != L'\'')
            *p++ = *fmt;
        break;
      case L'd':
      case L'M':
      case L'y':
        t_str = (fc == L'd' ? day_str : fc == L'M' ? mon_str : year_str);
        for (idx = 0; fmt[1] == fc; ++idx, ++fmt);
        if (idx > 3)
          idx = 3;
        if ((flags & DT_ABBREV) && fc != L'y' && idx == 3)
          idx = 2;
        *p++ = L'%';
        *p++ = t_str[idx];
        break;
      case L'g':
        /* TODO */
        break;
      case L'h':
      case L'H':
        t_str = (fc == L'h' || (flags & DT_AMPM) ? hour12_str : hour24_str);
        idx = 0;
        if (fmt[1] == fc)
          {
            ++fmt;
            idx = 1;
          }
        *p++ = L'%';
        *p++ = t_str[idx];
        break;
      case L'm':
      case L's':
      case L't':
        if (fmt[1] == fc)
          ++fmt;
        *p++ = L'%';
        *p++ = (fc == L'm' ? L'M' : fc == L's' ? L'S' : L'p');
        break;
      case L'\t':
      case L'\n':
      case L'%':
        *p++ = L'%';
        *p++ = fc;
        break;
      default:
        *p++ = *fmt;
        break;
      }
  *p++ = L'\0';
  *ptr = (char *) p;
  return ret;
}

/* Convert Windows grouping format into POSIX grouping format. */
static char *
conv_grouping (LCID lcid, LCTYPE type, char **lc_ptr)
{
  char buf[10]; /* Per MSDN max size of LOCALE_SGROUPING element incl. NUL */
  bool repeat = false;
  char *ptr = *lc_ptr;
  char *ret = ptr;

  GetLocaleInfoA (lcid, type, buf, 10);
  /* Convert Windows grouping format into POSIX grouping format. */
  for (char *c = buf; *c; ++c)
    {
      if (*c < '0' || *c > '9')
        continue;
      char val = *c - '0';
      if (!val)
        {
          repeat = true;
          break;
        }
      *ptr++ = val;
    }
  if (!repeat)
    *ptr++ = CHAR_MAX;
  *ptr++ = '\0';
  *lc_ptr = ptr;
  return ret;
}

/* Called from newlib's setlocale() via __time_load_locale() if category
   is LC_TIME.  Returns LC_TIME values fetched from Windows locale data
   in the structure pointed to by _time_locale.  This is subsequently
   accessed by functions like nl_langinfo, strftime, strptime. */
extern "C" int
__set_lc_time_from_win (const char *name,
                        const struct lc_time_T *_C_time_locale,
                        struct lc_time_T *_time_locale,
                        char **lc_time_buf, wctomb_p f_wctomb,
                        const char *charset)
{
  LCID lcid = __get_lcid_from_locale (name);
  if (lcid == (LCID) -1)
    return lcid;
  if (!lcid && !strcmp (charset, "ASCII"))
    return 0;

# define MAX_TIME_BUFFER_SIZE   4096

  char *new_lc_time_buf = (char *) malloc (MAX_TIME_BUFFER_SIZE);
  const char *lc_time_end = new_lc_time_buf + MAX_TIME_BUFFER_SIZE;

  if (!new_lc_time_buf)
    return -1;
  char *lc_time_ptr = new_lc_time_buf;

  /* C.foo is just a copy of "C" with fixed charset. */
  if (!lcid)
    memcpy (_time_locale, _C_time_locale, sizeof (struct lc_time_T));
  /* codeset */
  _time_locale->codeset = lc_time_ptr;
  lc_time_ptr = stpcpy (lc_time_ptr, charset) + 1;
  
  if (lcid)
    {
      char locale[ENCODING_LEN + 1];
      strcpy (locale, name);
      /* Removes the charset from the locale and attach the modifer to the
         language_TERRITORY part. */
      char *c = strchr (locale, '.');
      if (c)
        {
          *c = '\0';
          char *c2 = strchr (c + 1, '@');
          /* Ignore @cjknarrow modifier since it's a very personal thing between
             Cygwin and newlib... */
          if (c2 && strcmp (c2, "@cjknarrow"))
            memmove (c, c2, strlen (c2) + 1);
        }
      /* Now search in the alphabetically order lc_era array for the
         locale. */
      lc_era_t locale_key = { locale, NULL, NULL, NULL, NULL, NULL ,
                                      NULL, NULL, NULL, NULL, NULL };
      lc_era_t *era = (lc_era_t *) bsearch ((void *) &locale_key, (void *) lc_era,
                                            sizeof lc_era / sizeof *lc_era,
                                            sizeof *lc_era, locale_cmp);

      /* mon */
      for (int i = 0; i < 12; ++i)
        {
          _time_locale->wmon[i] = getlocaleinfo (time,
                                                 LOCALE_SABBREVMONTHNAME1 + i);
          _time_locale->mon[i] = charfromwchar (time, wmon[i]);
        }
      /* month and alt_month */
      for (int i = 0; i < 12; ++i)
        {
          _time_locale->wmonth[i] = getlocaleinfo (time, LOCALE_SMONTHNAME1 + i);
          _time_locale->month[i] = _time_locale->alt_month[i]
                                 = charfromwchar (time, wmonth[i]);
        }
      /* wday */
      _time_locale->wwday[0] = getlocaleinfo (time, LOCALE_SABBREVDAYNAME7);
      _time_locale->wday[0] = charfromwchar (time, wwday[0]);
      for (int i = 0; i < 6; ++i)
        {
          _time_locale->wwday[i + 1] = getlocaleinfo (time,
                                                      LOCALE_SABBREVDAYNAME1 + i);
          _time_locale->wday[i + 1] = charfromwchar (time, wwday[i + 1]);
        }
      /* weekday */
      _time_locale->wweekday[0] = getlocaleinfo (time, LOCALE_SDAYNAME7);
      _time_locale->weekday[0] = charfromwchar (time, wweekday[0]);
      for (int i = 0; i < 6; ++i)
        {
          _time_locale->wweekday[i + 1] = getlocaleinfo (time,
                                                         LOCALE_SDAYNAME1 + i);
          _time_locale->weekday[i + 1] = charfromwchar (time, wweekday[i + 1]);
        }
      size_t len;
      /* X_fmt */
      if (era && *era->t_fmt)
        {
          _time_locale->wX_fmt = (const wchar_t *) lc_time_ptr;
          lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wX_fmt,
                                          era->t_fmt) + 1);
        }
      else
        _time_locale->wX_fmt = eval_datetimefmt (LOCALE_STIMEFORMAT, DT_DEFAULT);
      _time_locale->X_fmt = charfromwchar (time, wX_fmt);
      /* x_fmt */
      if (era && *era->d_fmt)
        {
          _time_locale->wx_fmt = (const wchar_t *) lc_time_ptr;
          lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wx_fmt,
                                          era->d_fmt) + 1);
        }
      else
        _time_locale->wx_fmt = eval_datetimefmt (LOCALE_SSHORTDATE, DT_DEFAULT);
      _time_locale->x_fmt = charfromwchar (time, wx_fmt);
      /* c_fmt */
      if (era && *era->d_t_fmt)
        {
          _time_locale->wc_fmt = (const wchar_t *) lc_time_ptr;
          lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wc_fmt,
                                          era->d_t_fmt) + 1);
        }
      else
        {
          _time_locale->wc_fmt = eval_datetimefmt (LOCALE_SLONGDATE, DT_ABBREV);
          ((wchar_t *) lc_time_ptr)[-1] = L' ';
          eval_datetimefmt (LOCALE_STIMEFORMAT, DT_DEFAULT);
        }
      _time_locale->c_fmt = charfromwchar (time, wc_fmt);
      /* AM/PM */
      _time_locale->wam_pm[0] = getlocaleinfo (time, LOCALE_S1159);
      _time_locale->wam_pm[1] = getlocaleinfo (time, LOCALE_S2359);
      _time_locale->am_pm[0] = charfromwchar (time, wam_pm[0]);
      _time_locale->am_pm[1] = charfromwchar (time, wam_pm[1]);
      /* date_fmt */
      if (era && *era->date_fmt)
        {
          _time_locale->wdate_fmt = (const wchar_t *) lc_time_ptr;
          lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wdate_fmt,
                                          era->date_fmt) + 1);
        }
      else
        _time_locale->wdate_fmt = _time_locale->wc_fmt;
      _time_locale->date_fmt = charfromwchar (time, wdate_fmt);
      /* md */
      {
        wchar_t buf[80];
        GetLocaleInfoW (lcid, LOCALE_IDATE, buf, 80);
        _time_locale->md_order = (const char *) lc_time_ptr;
        lc_time_ptr = stpcpy (lc_time_ptr, *buf == L'1' ? "dm" : "md") + 1;
      }
      /* ampm_fmt */
      if (era)
        {
          _time_locale->wampm_fmt = (const wchar_t *) lc_time_ptr;
          lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wampm_fmt,
                                          era->t_fmt_ampm) + 1);
        }
      else
        _time_locale->wampm_fmt = eval_datetimefmt (LOCALE_STIMEFORMAT, DT_AMPM);
      _time_locale->ampm_fmt = charfromwchar (time, wampm_fmt);

      if (era)
        {
          /* Evaluate string length in target charset.  Characters invalid in the
             target charset are simply ignored, as on Linux. */
          len = 0;
          len += lc_wcstombs (f_wctomb, charset, NULL, era->era, 0) + 1;
          len += lc_wcstombs (f_wctomb, charset, NULL, era->era_d_fmt, 0) + 1;
          len += lc_wcstombs (f_wctomb, charset, NULL, era->era_d_t_fmt, 0) + 1;
          len += lc_wcstombs (f_wctomb, charset, NULL, era->era_t_fmt, 0) + 1;
          len += lc_wcstombs (f_wctomb, charset, NULL, era->alt_digits, 0) + 1;
          len += (wcslen (era->era) + 1) * sizeof (wchar_t);
          len += (wcslen (era->era_d_fmt) + 1) * sizeof (wchar_t);
          len += (wcslen (era->era_d_t_fmt) + 1) * sizeof (wchar_t);
          len += (wcslen (era->era_t_fmt) + 1) * sizeof (wchar_t);
          len += (wcslen (era->alt_digits) + 1) * sizeof (wchar_t);

          /* Make sure data fits into the buffer */
          if (lc_time_ptr + len > lc_time_end)
            {
              len = lc_time_ptr + len - new_lc_time_buf;
              char *tmp = (char *) realloc (new_lc_time_buf, len);
              if (!tmp)
                era = NULL;
              else
                {
                  if (tmp != new_lc_time_buf)
                    rebase_locale_buf (_time_locale, tmp, new_lc_time_buf,
                                       _time_locale + 1);
                  lc_time_ptr = tmp + (lc_time_ptr - new_lc_time_buf);
                  new_lc_time_buf = tmp;
                  lc_time_end = new_lc_time_buf + len;
                }
            }
          /* Copy over */
          if (era)
            {
              /* era */
              _time_locale->wera = (const wchar_t *) lc_time_ptr;
              lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wera,
                                              era->era) + 1);
              _time_locale->era = charfromwchar (time, wera);
              /* era_d_fmt */
              _time_locale->wera_d_fmt = (const wchar_t *) lc_time_ptr;
              lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wera_d_fmt,
                                              era->era_d_fmt) + 1);
              _time_locale->era_d_fmt = charfromwchar (time, wera_d_fmt);
              /* era_d_t_fmt */
              _time_locale->wera_d_t_fmt = (const wchar_t *) lc_time_ptr;
              lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wera_d_t_fmt,
                                              era->era_d_t_fmt) + 1);
              _time_locale->era_d_t_fmt = charfromwchar (time, wera_d_t_fmt);
              /* era_t_fmt */
              _time_locale->wera_t_fmt = (const wchar_t *) lc_time_ptr;
              lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->wera_t_fmt,
                                              era->era_t_fmt) + 1);
              _time_locale->era_t_fmt = charfromwchar (time, wera_t_fmt);
              /* alt_digits */
              _time_locale->walt_digits = (const wchar_t *) lc_time_ptr;
              lc_time_ptr = (char *) (wcpcpy ((wchar_t *) _time_locale->walt_digits,
                                              era->alt_digits) + 1);
              _time_locale->alt_digits = charfromwchar (time, walt_digits);
            }
        }
      if (!era)
        {
          _time_locale->wera =
          _time_locale->wera_d_fmt = 
          _time_locale->wera_d_t_fmt =
          _time_locale->wera_t_fmt =
          _time_locale->walt_digits = (const wchar_t *) lc_time_ptr;
          _time_locale->era =
          _time_locale->era_d_fmt = 
          _time_locale->era_d_t_fmt =
          _time_locale->era_t_fmt =
          _time_locale->alt_digits = (const char *) lc_time_ptr;
          /* Twice, to make sure wide char strings are correctly terminated. */
          *lc_time_ptr++ = '\0';
          *lc_time_ptr++ = '\0';
        }
    }

  char *tmp = (char *) realloc (new_lc_time_buf, lc_time_ptr - new_lc_time_buf);
  if (!tmp)
    {
      free (new_lc_time_buf);
      return -1;
    }
  if (tmp != new_lc_time_buf)
    rebase_locale_buf (_time_locale, tmp, new_lc_time_buf,
                       _time_locale + 1);
  if (*lc_time_buf)
    free (*lc_time_buf);
  *lc_time_buf = tmp;
  return 1;
}

/* Called from newlib's setlocale() via __ctype_load_locale() if category
   is LC_CTYPE.  Returns LC_CTYPE values fetched from Windows locale data
   in the structure pointed to by _ctype_locale.  This is subsequently
   accessed by functions like nl_langinfo, localeconv, printf, etc. */
extern "C" int
__set_lc_ctype_from_win (const char *name,
                         const struct lc_ctype_T *_C_ctype_locale,
                         struct lc_ctype_T *_ctype_locale,
                         char **lc_ctype_buf, wctomb_p f_wctomb,
                         const char *charset, int mb_cur_max)
{
  LCID lcid = __get_lcid_from_locale (name);
  if (lcid == (LCID) -1)
    return lcid;
  if (!lcid && !strcmp (charset, "ASCII"))
    return 0;

# define MAX_CTYPE_BUFFER_SIZE  256

  char *new_lc_ctype_buf = (char *) malloc (MAX_CTYPE_BUFFER_SIZE);

  if (!new_lc_ctype_buf)
    return -1;
  char *lc_ctype_ptr = new_lc_ctype_buf;
  /* C.foo is just a copy of "C" with fixed charset. */
  if (!lcid)
    memcpy (_ctype_locale, _C_ctype_locale, sizeof (struct lc_ctype_T));
  /* codeset */
  _ctype_locale->codeset = lc_ctype_ptr;
  lc_ctype_ptr = stpcpy (lc_ctype_ptr, charset) + 1;
  /* mb_cur_max */
  _ctype_locale->mb_cur_max = lc_ctype_ptr;
  *lc_ctype_ptr++ = mb_cur_max;
  *lc_ctype_ptr++ = '\0';
  if (lcid)
    {
      /* outdigits and woutdigits */
      wchar_t digits[11];
      GetLocaleInfoW (lcid, LOCALE_SNATIVEDIGITS, digits, 11);
      for (int i = 0; i <= 9; ++i)
        {
          mbstate_t state;

          /* Make sure the wchar_t's are always 2 byte aligned. */
          if ((uintptr_t) lc_ctype_ptr % 2)
            ++lc_ctype_ptr;
          wchar_t *woutdig = (wchar_t *) lc_ctype_ptr;
          _ctype_locale->woutdigits[i] = (const wchar_t *) woutdig;
          *woutdig++ = digits[i];
          *woutdig++ = L'\0';
          lc_ctype_ptr = (char *) woutdig;
          _ctype_locale->outdigits[i] = lc_ctype_ptr;
          memset (&state, 0, sizeof state);
          lc_ctype_ptr += f_wctomb (_REENT, lc_ctype_ptr, digits[i], charset,
                                      &state);
          *lc_ctype_ptr++ = '\0';
        }
    }

  char *tmp = (char *) realloc (new_lc_ctype_buf,
                                lc_ctype_ptr - new_lc_ctype_buf);
  if (!tmp)
    {
      free (new_lc_ctype_buf);
      return -1;
    }
  if (tmp != new_lc_ctype_buf)
    rebase_locale_buf (_ctype_locale, tmp, new_lc_ctype_buf,
                       _ctype_locale + 1);
  if (*lc_ctype_buf)
    free (*lc_ctype_buf);
  *lc_ctype_buf = tmp;
  return 1;
}

/* Called from newlib's setlocale() via __numeric_load_locale() if category
   is LC_NUMERIC.  Returns LC_NUMERIC values fetched from Windows locale data
   in the structure pointed to by _numeric_locale.  This is subsequently
   accessed by functions like nl_langinfo, localeconv, printf, etc. */
extern "C" int
__set_lc_numeric_from_win (const char *name,
                           const struct lc_numeric_T *_C_numeric_locale,
                           struct lc_numeric_T *_numeric_locale,
                           char **lc_numeric_buf, wctomb_p f_wctomb,
                           const char *charset)
{
  LCID lcid = __get_lcid_from_locale (name);
  if (lcid == (LCID) -1)
    return lcid;
  if (!lcid && !strcmp (charset, "ASCII"))
    return 0;

# define MAX_NUMERIC_BUFFER_SIZE        256

  char *new_lc_numeric_buf = (char *) malloc (MAX_NUMERIC_BUFFER_SIZE);
  const char *lc_numeric_end = new_lc_numeric_buf + MAX_NUMERIC_BUFFER_SIZE;

  if (!new_lc_numeric_buf)
    return -1;
  char *lc_numeric_ptr = new_lc_numeric_buf;
  /* C.foo is just a copy of "C" with fixed charset. */
  if (!lcid)
    memcpy (_numeric_locale, _C_numeric_locale, sizeof (struct lc_numeric_T));
  else
    {
      /* decimal_point */
      _numeric_locale->wdecimal_point = getlocaleinfo (numeric, LOCALE_SDECIMAL);
      _numeric_locale->decimal_point = charfromwchar (numeric, wdecimal_point);
      /* thousands_sep */
      _numeric_locale->wthousands_sep = getlocaleinfo (numeric, LOCALE_STHOUSAND);
      _numeric_locale->thousands_sep = charfromwchar (numeric, wthousands_sep);
      /* grouping */
      _numeric_locale->grouping = conv_grouping (lcid, LOCALE_SGROUPING,
                                                 &lc_numeric_ptr);
    }
  /* codeset */
  _numeric_locale->codeset = lc_numeric_ptr;
  lc_numeric_ptr = stpcpy (lc_numeric_ptr, charset) + 1;
  
  char *tmp = (char *) realloc (new_lc_numeric_buf,
                                lc_numeric_ptr - new_lc_numeric_buf);
  if (!tmp)
    {
      free (new_lc_numeric_buf);
      return -1;
    }
  if (tmp != new_lc_numeric_buf)
    rebase_locale_buf (_numeric_locale, tmp, new_lc_numeric_buf,
                       _numeric_locale + 1);
  if (*lc_numeric_buf)
    free (*lc_numeric_buf);
  *lc_numeric_buf = tmp;
  return 1;
}

/* Called from newlib's setlocale() via __monetary_load_locale() if category
   is LC_MONETARY.  Returns LC_MONETARY values fetched from Windows locale data
   in the structure pointed to by _monetary_locale.  This is subsequently
   accessed by functions like nl_langinfo, localeconv, printf, etc. */
extern "C" int
__set_lc_monetary_from_win (const char *name,
                            const struct lc_monetary_T *_C_monetary_locale,
                            struct lc_monetary_T *_monetary_locale,
                            char **lc_monetary_buf, wctomb_p f_wctomb,
                            const char *charset)
{
  LCID lcid = __get_lcid_from_locale (name);
  if (lcid == (LCID) -1)
    return lcid;
  if (!lcid && !strcmp (charset, "ASCII"))
    return 0;

# define MAX_MONETARY_BUFFER_SIZE       512

  char *new_lc_monetary_buf = (char *) malloc (MAX_MONETARY_BUFFER_SIZE);
  const char *lc_monetary_end = new_lc_monetary_buf + MAX_MONETARY_BUFFER_SIZE;

  if (!new_lc_monetary_buf)
    return -1;
  char *lc_monetary_ptr = new_lc_monetary_buf;
  /* C.foo is just a copy of "C" with fixed charset. */
  if (!lcid)
    memcpy (_monetary_locale, _C_monetary_locale, sizeof (struct lc_monetary_T));
  else
    {
      /* int_curr_symbol */
      _monetary_locale->wint_curr_symbol = getlocaleinfo (monetary,
                                                          LOCALE_SINTLSYMBOL);
      /* No spacing char means space. */
      if (!_monetary_locale->wint_curr_symbol[3])
        {
          wchar_t *wc = (wchar_t *) _monetary_locale->wint_curr_symbol + 3;
          *wc++ = L' ';
          *wc++ = L'\0';
          lc_monetary_ptr = (char *) wc;
        }
      _monetary_locale->int_curr_symbol = charfromwchar (monetary,
                                                         wint_curr_symbol);
      /* currency_symbol */
      _monetary_locale->wcurrency_symbol = getlocaleinfo (monetary,
                                                          LOCALE_SCURRENCY);
      /* As on Linux:  If the currency_symbol can't be represented in the
         given charset, use int_curr_symbol. */
      if (lc_wcstombs (f_wctomb, charset, NULL,
                       _monetary_locale->wcurrency_symbol,
                       0, true) == (size_t) -1)
        _monetary_locale->currency_symbol = _monetary_locale->int_curr_symbol;
      else
        _monetary_locale->currency_symbol = charfromwchar (monetary,
                                                           wcurrency_symbol);
      /* mon_decimal_point */
      _monetary_locale->wmon_decimal_point = getlocaleinfo (monetary,
                                                            LOCALE_SMONDECIMALSEP);
      _monetary_locale->mon_decimal_point = charfromwchar (monetary,
                                                           wmon_decimal_point);
      /* mon_thousands_sep */
      _monetary_locale->wmon_thousands_sep = getlocaleinfo (monetary,
                                                            LOCALE_SMONTHOUSANDSEP);
      _monetary_locale->mon_thousands_sep = charfromwchar (monetary,
                                                           wmon_thousands_sep);
      /* mon_grouping */
      _monetary_locale->mon_grouping = conv_grouping (lcid, LOCALE_SMONGROUPING,
                                                      &lc_monetary_ptr);
      /* positive_sign */
      _monetary_locale->wpositive_sign = getlocaleinfo (monetary,
                                                        LOCALE_SPOSITIVESIGN);
      _monetary_locale->positive_sign = charfromwchar (monetary, wpositive_sign);
      /* negative_sign */
      _monetary_locale->wnegative_sign = getlocaleinfo (monetary,
                                                        LOCALE_SNEGATIVESIGN);
      _monetary_locale->negative_sign = charfromwchar (monetary, wnegative_sign);
      /* int_frac_digits */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_IINTLCURRDIGITS);
      _monetary_locale->int_frac_digits = lc_monetary_ptr++;
      /* frac_digits */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_ICURRDIGITS);
      _monetary_locale->frac_digits = lc_monetary_ptr++;
      /* p_cs_precedes and int_p_cs_precedes */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_IPOSSYMPRECEDES);
      _monetary_locale->p_cs_precedes
            = _monetary_locale->int_p_cs_precedes = lc_monetary_ptr++;
      /* p_sep_by_space and int_p_sep_by_space */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_IPOSSEPBYSPACE);
      _monetary_locale->p_sep_by_space
            = _monetary_locale->int_p_sep_by_space = lc_monetary_ptr++;
      /* n_cs_precedes and int_n_cs_precedes */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_INEGSYMPRECEDES);
      _monetary_locale->n_cs_precedes
            = _monetary_locale->int_n_cs_precedes = lc_monetary_ptr++;
      /* n_sep_by_space and int_n_sep_by_space */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_INEGSEPBYSPACE);
      _monetary_locale->n_sep_by_space
            = _monetary_locale->int_n_sep_by_space = lc_monetary_ptr++;
      /* p_sign_posn and int_p_sign_posn */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_IPOSSIGNPOSN);
      _monetary_locale->p_sign_posn
            = _monetary_locale->int_p_sign_posn = lc_monetary_ptr++;
      /* n_sign_posn and int_n_sign_posn */
      *lc_monetary_ptr = (char) getlocaleint (lcid, LOCALE_INEGSIGNPOSN);
      _monetary_locale->n_sign_posn
            = _monetary_locale->int_n_sign_posn = lc_monetary_ptr++;
    }
  /* codeset */
  _monetary_locale->codeset = lc_monetary_ptr;
  lc_monetary_ptr = stpcpy (lc_monetary_ptr, charset) + 1;

  char *tmp = (char *) realloc (new_lc_monetary_buf,
                                lc_monetary_ptr - new_lc_monetary_buf);
  if (!tmp)
    {
      free (new_lc_monetary_buf);
      return -1;
    }
  if (tmp != new_lc_monetary_buf)
    rebase_locale_buf (_monetary_locale, tmp, new_lc_monetary_buf,
                       _monetary_locale + 1);
  if (*lc_monetary_buf)
    free (*lc_monetary_buf);
  *lc_monetary_buf = tmp;
  return 1;
}

extern "C" int
__set_lc_messages_from_win (const char *name,
                            const struct lc_messages_T *_C_messages_locale,
                            struct lc_messages_T *_messages_locale,
                            char **lc_messages_buf,
                            wctomb_p f_wctomb, const char *charset)
{
  LCID lcid = __get_lcid_from_locale (name);
  if (lcid == (LCID) -1)
    return lcid;
  if (!lcid && !strcmp (charset, "ASCII"))
    return 0;

  char locale[ENCODING_LEN + 1];
  char *c, *c2;
  lc_msg_t *msg = NULL;

  /* C.foo is just a copy of "C" with fixed charset. */
  if (!lcid)
    memcpy (_messages_locale, _C_messages_locale, sizeof (struct lc_messages_T));
  else
    {
      strcpy (locale, name);
      /* Removes the charset from the locale and attach the modifer to the
         language_TERRITORY part. */
      c = strchr (locale, '.');
      if (c)
        {
          *c = '\0';
          c2 = strchr (c + 1, '@');
          /* Ignore @cjknarrow modifier since it's a very personal thing between
             Cygwin and newlib... */
          if (c2 && strcmp (c2, "@cjknarrow"))
            memmove (c, c2, strlen (c2) + 1);
        }
      /* Now search in the alphabetically order lc_msg array for the
         locale. */
      lc_msg_t locale_key = { locale, NULL, NULL, NULL, NULL };
      msg = (lc_msg_t *) bsearch ((void *) &locale_key, (void *) lc_msg,
                                  sizeof lc_msg / sizeof *lc_msg,
                                  sizeof *lc_msg, locale_cmp);
      if (!msg)
        return 0;
    }

  /* Evaluate string length in target charset.  Characters invalid in the
     target charset are simply ignored, as on Linux. */
  size_t len = 0;
  len += (strlen (charset) + 1);
  if (lcid)
    {
      len += lc_wcstombs (f_wctomb, charset, NULL, msg->yesexpr, 0) + 1;
      len += lc_wcstombs (f_wctomb, charset, NULL, msg->noexpr, 0) + 1;
      len += lc_wcstombs (f_wctomb, charset, NULL, msg->yesstr, 0) + 1;
      len += lc_wcstombs (f_wctomb, charset, NULL, msg->nostr, 0) + 1;
      len += (wcslen (msg->yesexpr) + 1) * sizeof (wchar_t);
      len += (wcslen (msg->noexpr) + 1) * sizeof (wchar_t);
      len += (wcslen (msg->yesstr) + 1) * sizeof (wchar_t);
      len += (wcslen (msg->nostr) + 1) * sizeof (wchar_t);
      if (len % 1)
        ++len;
    }
  /* Allocate. */
  char *new_lc_messages_buf = (char *) malloc (len);
  const char *lc_messages_end = new_lc_messages_buf + len;

  if (!new_lc_messages_buf)
    return -1;
  /* Copy over. */
  c = new_lc_messages_buf;
  /* codeset */
  _messages_locale->codeset = c;
  c = stpcpy (c, charset) + 1;
  if (lcid)
    {
      _messages_locale->yesexpr = (const char *) c;
      len = lc_wcstombs (f_wctomb, charset, c, msg->yesexpr, lc_messages_end - c);
      _messages_locale->noexpr = (const char *) (c += len + 1);
      len = lc_wcstombs (f_wctomb, charset, c, msg->noexpr, lc_messages_end - c);
      _messages_locale->yesstr = (const char *) (c += len + 1);
      len = lc_wcstombs (f_wctomb, charset, c, msg->yesstr, lc_messages_end - c);
      _messages_locale->nostr = (const char *) (c += len + 1);
      len = lc_wcstombs (f_wctomb, charset, c, msg->nostr, lc_messages_end - c);
      c += len + 1;
      if ((uintptr_t) c % 1)
        ++c;
      wchar_t *wc = (wchar_t *) c;
      _messages_locale->wyesexpr = (const wchar_t *) wc;
      wc = wcpcpy (wc, msg->yesexpr) + 1;
      _messages_locale->wnoexpr = (const wchar_t *) wc;
      wc = wcpcpy (wc, msg->noexpr) + 1;
      _messages_locale->wyesstr = (const wchar_t *) wc;
      wc = wcpcpy (wc, msg->yesstr) + 1;
      _messages_locale->wnostr = (const wchar_t *) wc;
      wcpcpy (wc, msg->nostr);
    }
  /* Aftermath. */
  if (*lc_messages_buf)
    free (*lc_messages_buf);
  *lc_messages_buf = new_lc_messages_buf;
  return 1;
}

LCID collate_lcid = 0;
static mbtowc_p collate_mbtowc = __ascii_mbtowc;
char collate_charset[ENCODING_LEN + 1] = "ASCII";

/* Called from newlib's setlocale() if category is LC_COLLATE.  Stores
   LC_COLLATE locale information.  This is subsequently accessed by the
   below functions strcoll, strxfrm, wcscoll, wcsxfrm. */
extern "C" int
__collate_load_locale (const char *name, mbtowc_p f_mbtowc, const char *charset)
{
  LCID lcid = __get_lcid_from_locale (name);
  if (lcid == (LCID) -1)
    return -1;
  collate_lcid = lcid;
  collate_mbtowc = f_mbtowc;
  stpcpy (collate_charset, charset);
  return 0;
}

extern "C" const char *
__get_current_collate_codeset (void)
{
  return collate_charset;
}

/* We use the Windows functions for locale-specific string comparison and
   transformation.  The advantage is that we don't need any files with
   collation information. */
extern "C" int
wcscoll (const wchar_t *ws1, const wchar_t *ws2)
{
  int ret;

  if (!collate_lcid)
    return wcscmp (ws1, ws2);
  ret = CompareStringW (collate_lcid, 0, ws1, -1, ws2, -1);
  if (!ret)
    set_errno (EINVAL);
  return ret - CSTR_EQUAL;
}

extern "C" int
strcoll (const char *s1, const char *s2)
{
  size_t n1, n2;
  wchar_t *ws1, *ws2;
  tmp_pathbuf tp;
  int ret;

  if (!collate_lcid)
    return strcmp (s1, s2);
  /* The ANSI version of CompareString uses the default charset of the lcid,
     so we must use the Unicode version. */
  n1 = lc_mbstowcs (collate_mbtowc, collate_charset, NULL, s1, 0) + 1;
  ws1 = (n1 > NT_MAX_PATH ? (wchar_t *) malloc (n1 * sizeof (wchar_t))
                          : tp.w_get ());
  lc_mbstowcs (collate_mbtowc, collate_charset, ws1, s1, n1);
  n2 = lc_mbstowcs (collate_mbtowc, collate_charset, NULL, s2, 0) + 1;
  ws2 = (n2 > NT_MAX_PATH ? (wchar_t *) malloc (n2 * sizeof (wchar_t))
                          : tp.w_get ());
  lc_mbstowcs (collate_mbtowc, collate_charset, ws2, s2, n2);
  ret = CompareStringW (collate_lcid, 0, ws1, -1, ws2, -1);
  if (n1 > NT_MAX_PATH)
    free (ws1);
  if (n2 > NT_MAX_PATH)
    free (ws2);
  if (!ret)
    set_errno (EINVAL);
  return ret - CSTR_EQUAL;
}

extern "C" size_t
wcsxfrm (wchar_t *ws1, const wchar_t *ws2, size_t wsn)
{
  size_t ret;

  if (!collate_lcid)
    return wcslcpy (ws1, ws2, wsn);
  ret = LCMapStringW (collate_lcid, LCMAP_SORTKEY | LCMAP_BYTEREV,
                      ws2, -1, ws1, wsn * sizeof (wchar_t));
  /* LCMapStringW returns byte count including the terminating NUL character,
     wcsxfrm is supposed to return length in wchar_t excluding the NUL.
     Since the array is only single byte NUL-terminated we must make sure
     the result is wchar_t-NUL terminated. */
  if (ret)
    {
      ret = (ret + 1) / sizeof (wchar_t);
      if (ret >= wsn)
        return wsn;
      ws1[ret] = L'\0';
      return ret;
    }
  if (GetLastError () != ERROR_INSUFFICIENT_BUFFER)
    set_errno (EINVAL);
  return wsn;
}

extern "C" size_t
strxfrm (char *s1, const char *s2, size_t sn)
{
  size_t ret;
  size_t n2;
  wchar_t *ws2;
  tmp_pathbuf tp;

  if (!collate_lcid)
    return strlcpy (s1, s2, sn);
  /* The ANSI version of LCMapString uses the default charset of the lcid,
     so we must use the Unicode version. */
  n2 = lc_mbstowcs (collate_mbtowc, collate_charset, NULL, s2, 0) + 1;
  ws2 = (n2 > NT_MAX_PATH ? (wchar_t *) malloc (n2 * sizeof (wchar_t))
                          : tp.w_get ());
  lc_mbstowcs (collate_mbtowc, collate_charset, ws2, s2, n2);
  /* The sort key is a NUL-terminated byte string. */
  ret = LCMapStringW (collate_lcid, LCMAP_SORTKEY, ws2, -1, (PWCHAR) s1, sn);
  if (n2 > NT_MAX_PATH)
    free (ws2);
  if (ret == 0)
    {
      if (GetLastError () != ERROR_INSUFFICIENT_BUFFER)
        set_errno (EINVAL);
      return sn;
    }
  /* LCMapStringW returns byte count including the terminating NUL character.
     strxfrm is supposed to return length excluding the NUL. */
  return ret - 1;
}

/* Fetch default ANSI codepage from locale info and generate a setlocale
   compatible character set code.  Called from newlib's setlocale(), if the
   charset isn't given explicitely in the POSIX compatible locale specifier. */
extern "C" void
__set_charset_from_locale (const char *locale, char *charset)
{
  UINT cp;
  LCID lcid = __get_lcid_from_locale (locale);
  wchar_t wbuf[9];

  /* "C" locale, or invalid locale? */
  if (lcid == 0 || lcid == (LCID) -1)
    cp = 20127;
  else if (!GetLocaleInfoW (lcid,
                            LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
                            (PWCHAR) &cp, sizeof cp))
    cp = 0;
  /* Translate codepage and lcid to a charset closely aligned with the default
     charsets defined in Glibc. */
  const char *cs;
  const char *modifier = strchr (locale, '@') ?: "";
  switch (cp)
    {
    case 20127:
      cs = "ASCII";
      break;
    case 874:
      cs = "CP874";
      break;
    case 932:
      cs = "EUCJP";
      break;
    case 936:
      cs = "GB2312";
      break;
    case 949:
      cs = "EUCKR";
      break;
    case 950:
      cs = "BIG5";
      break;
    case 1250:
      if (lcid == 0x081a                /* sr_CS (Serbian Language/Former
                                                  Serbia and Montenegro) */
          || lcid == 0x181a             /* sr_BA (Serbian Language/Bosnia
                                                  and Herzegovina) */
          || lcid == 0x241a             /* sr_RS (Serbian Language/Serbia) */
          || lcid == 0x2c1a             /* sr_ME (Serbian Language/Montenegro)*/
          || lcid == 0x0442)            /* tk_TM (Turkmen/Turkmenistan) */
        cs = "UTF-8";
      else if (lcid == 0x041c)          /* sq_AL (Albanian/Albania) */
        cs = "ISO-8859-1";
      else
        cs = "ISO-8859-2";
      break;
    case 1251:
      if (lcid == 0x0c1a                /* sr_CS (Serbian Language/Former
                                                  Serbia and Montenegro) */
          || lcid == 0x1c1a             /* sr_BA (Serbian Language/Bosnia
                                                  and Herzegovina) */
          || lcid == 0x281a             /* sr_RS (Serbian Language/Serbia) */
          || lcid == 0x301a             /* sr_ME (Serbian Language/Montenegro)*/
          || lcid == 0x0440             /* ky_KG (Kyrgyz/Kyrgyzstan) */
          || lcid == 0x0843             /* uz_UZ (Uzbek/Uzbekistan) */
                                        /* tt_RU (Tatar/Russia),
                                                 IQTElif alphabet */
          || (lcid == 0x0444 && has_modifier ("@iqtelif"))
          || lcid == 0x0450)            /* mn_MN (Mongolian/Mongolia) */
        cs = "UTF-8";
      else if (lcid == 0x0423)          /* be_BY (Belarusian/Belarus) */
        cs = has_modifier ("@latin") ? "UTF-8" : "CP1251";
      else if (lcid == 0x0402)          /* bg_BG (Bulgarian/Bulgaria) */
        cs = "CP1251";
      else if (lcid == 0x0422)          /* uk_UA (Ukrainian/Ukraine) */
        cs = "KOI8-U";
      else
        cs = "ISO-8859-5";
      break;
    case 1252:
      if (lcid == 0x0452)               /* cy_GB (Welsh/Great Britain) */
        cs = "ISO-8859-14";
      else if (lcid == 0x4009           /* en_IN (English/India) */
               || lcid == 0x0464        /* fil_PH (Filipino/Philippines) */
               || lcid == 0x0462        /* fy_NL (Frisian/Netherlands) */
               || lcid == 0x0468        /* ha_NG (Hausa/Nigeria) */
               || lcid == 0x0470        /* ig_NG (Igbo/Nigeria) */
               || lcid == 0x046c        /* nso_ZA (Northern Sotho/South Africa) */
               || lcid == 0x0487        /* rw_RW (Kinyarwanda/Rwanda) */
               || lcid == 0x043b        /* se_NO (Northern Saami/Norway) */
               || lcid == 0x0432        /* tn_ZA (Tswana/South Africa) */
               || lcid == 0x0488        /* wo_SN (Wolof/Senegal) */
               || lcid == 0x046a        /* yo_NG (Yoruba/Nigeria) */
               || lcid == 0x085d)       /* iu_CA (Inuktitut/Canada) */
        cs = "UTF-8";
      else if (lcid == 0x042e)          /* hsb_DE (Upper Sorbian/Germany) */
        cs = "ISO-8859-2";
      else if (lcid == 0x0491           /* gd_GB (Scots Gaelic/Great Britain) */
               || (has_modifier ("@euro")
                   && GetLocaleInfoW (lcid, LOCALE_SINTLSYMBOL, wbuf, 9)
                   && !wcsncmp (wbuf, L"EUR", 3)))
        cs = "ISO-8859-15";
      else
        cs = "ISO-8859-1";
      break;
    case 1253:
      cs = "ISO-8859-7";
      break;
    case 1254:
      if (lcid == 0x042c)               /* az_AZ (Azeri/Azerbaijan) */
        cs = "UTF-8";
      else if (lcid == 0x0443)          /* uz_UZ (Uzbek/Uzbekistan) */
        cs = "ISO-8859-1";
      else
        cs = "ISO-8859-9";
      break;
    case 1255:
      cs = "ISO-8859-8";
      break;
    case 1256:
      if (lcid == 0x0429                /* fa_IR (Persian/Iran) */
          || lcid == 0x0480             /* ug_CN (Uyghur/China) */
          || lcid == 0x0420)            /* ur_PK (Urdu/Pakistan) */
        cs = "UTF-8";
      else
        cs = "ISO-8859-6";
      break;
    case 1257:
      if (lcid == 0x0425)               /* et_EE (Estonian/Estonia) */
        cs = "ISO-8859-15";
      else
        cs = "ISO-8859-13";
      break;
    case 1258:
    default:
      if (lcid == 0x0481)               /* mi_NZ (Maori/New Zealand) */
        cs = "ISO-8859-13";
      else if (lcid == 0x043a)          /* mt_MT (Maltese/Malta) */
        cs = "ISO-8859-3";
      else if (lcid == 0x0437)          /* ka_GE (Georgian/Georgia) */
        cs = "GEORGIAN-PS";
      else if (lcid == 0x043f)          /* kk_KZ (Kazakh/Kazakhstan) */
        cs = "PT154";
      else
        cs = "UTF-8";
      break;
    }
  stpcpy (charset, cs);
}

/* This function is called from newlib's loadlocale if the locale identifier
   was invalid, one way or the other.  It looks for the file

     /usr/share/locale/locale.alias

   which is part of the gettext package, and if it finds the locale alias
   in that file, it replaces the locale with the correct locale string from
   that file.
   
   If successful, it returns a pointer to new_locale, NULL otherwise.*/
extern "C" char *
__set_locale_from_locale_alias (const char *locale, char *new_locale)
{
  wchar_t wlocale[ENCODING_LEN + 1];
  wchar_t walias[ENCODING_LEN + 1];
#define LOCALE_ALIAS_LINE_LEN 255
  char alias_buf[LOCALE_ALIAS_LINE_LEN + 1], *c;
  wchar_t *wc;
  const char *alias, *replace;
  char *ret = NULL;

  FILE *fp = fopen ("/usr/share/locale/locale.alias", "rt");
  if (!fp)
    return NULL;
  /* The incoming locale is given in the application charset, or in
     the Cygwin internal charset.  We try both. */
  if (mbstowcs (wlocale, locale, ENCODING_LEN + 1) == (size_t) -1)
    sys_mbstowcs (wlocale, ENCODING_LEN + 1, locale);
  wlocale[ENCODING_LEN] = L'\0';
  /* Ignore @cjknarrow modifier since it's a very personal thing between
     Cygwin and newlib... */
  if ((wc = wcschr (wlocale, L'@')) && !wcscmp (wc + 1, L"cjknarrow"))
    *wc = L'\0';
  while (fgets (alias_buf, LOCALE_ALIAS_LINE_LEN + 1, fp))
    {
      alias_buf[LOCALE_ALIAS_LINE_LEN] = '\0';
      c = strrchr (alias_buf, '\n');
      if (c)
        *c = '\0';
      c = alias_buf;
      c += strspn (c, " \t");
      if (!*c || *c == '#')
        continue;
      alias = c;
      c += strcspn (c, " \t");
      *c++ = '\0';
      c += strspn (c, " \t");
      if (*c == '#')
        continue;
      replace = c;
      c += strcspn (c, " \t");
      *c++ = '\0';
      if (strlen (replace) > ENCODING_LEN)
        continue;
      /* The file is latin1 encoded */
      lc_mbstowcs (__iso_mbtowc, "ISO-8859-1", walias, alias, ENCODING_LEN + 1);
      walias[ENCODING_LEN] = L'\0';
      if (!wcscmp (wlocale, walias))
        {
          ret = strcpy (new_locale, replace);
          break;
        }
    }
  fclose (fp);
  return ret;
}

static char *
check_codepage (char *ret)
{
  if (!wincap.has_always_all_codepages ())
    {
      /* Prior to Windows Vista, many codepages are not installed by
         default, or can be deinstalled.  The following codepages require
         that the respective conversion tables are installed into the OS.
         So we check if they are installed and if not, setlocale should
         fail. */
      CPINFO cpi;
      UINT cp = 0;
      if (__mbtowc == __sjis_mbtowc)
        cp = 932;
      else if (__mbtowc == __eucjp_mbtowc)
        cp = 20932;
      else if (__mbtowc == __gbk_mbtowc)
        cp = 936;
      else if (__mbtowc == __kr_mbtowc)
        cp = 949;
      else if (__mbtowc == __big5_mbtowc)
        cp = 950;
      if (cp && !GetCPInfo (cp, &cpi)
          && GetLastError () == ERROR_INVALID_PARAMETER)
        return NULL;
    }
  return ret;
}

/* Can be called via cygwin_internal (CW_INTERNAL_SETLOCALE) for application
   which really (think they) know what they are doing. */
extern "C" void
internal_setlocale ()
{
  /* Each setlocale from the environment potentially changes the
     multibyte representation of the CWD.  Therefore we have to
     reevaluate the CWD's posix path and store in the new charset.
     Same for the PATH environment variable. */
  /* FIXME: Other buffered paths might be affected as well. */
  /* FIXME: It could be necessary to convert the entire environment,
            not just PATH. */
  tmp_pathbuf tp;
  char *path;
  wchar_t *w_path = NULL, *w_cwd;

  /* Don't do anything if the charset hasn't actually changed. */
  if (strcmp (cygheap->locale.charset, __locale_charset ()) == 0)
    return;

  debug_printf ("Cygwin charset changed from %s to %s",
                cygheap->locale.charset, __locale_charset ());
  /* Fetch PATH and CWD and convert to wchar_t in previous charset. */
  path = getenv ("PATH");
  if (path && *path)    /* $PATH can be potentially unset. */
    {
      w_path = tp.w_get ();
      sys_mbstowcs (w_path, 32768, path);
    }
  w_cwd = tp.w_get ();
  cwdstuff::cwd_lock.acquire ();
  sys_mbstowcs (w_cwd, 32768, cygheap->cwd.get_posix ());
  /* Set charset for internal conversion functions. */
  if (*__locale_charset () == 'A'/*SCII*/)
    {
      cygheap->locale.mbtowc = __utf8_mbtowc;
      cygheap->locale.wctomb = __utf8_wctomb;
    }
  else
    {
      cygheap->locale.mbtowc = __mbtowc;
      cygheap->locale.wctomb = __wctomb;
    }
  strcpy (cygheap->locale.charset, __locale_charset ());
  /* Restore CWD and PATH in new charset. */
  cygheap->cwd.reset_posix (w_cwd);
  cwdstuff::cwd_lock.release ();
  if (w_path)
    {
      char *c_path = tp.c_get ();
      sys_wcstombs (c_path, 32768, w_path);
      setenv ("PATH", c_path, 1);
    }
}

/* Called from dll_crt0_1, before fetching the command line from Windows.
   Set the internal charset according to the environment locale settings.
   Check if a required codepage is available, and only switch internal
   charset if so.
   Make sure to reset the application locale to "C" per POSIX. */
void
initial_setlocale ()
{
  char *ret = _setlocale_r (_REENT, LC_CTYPE, "");
  if (ret && check_codepage (ret))
    internal_setlocale ();
}

/* Like newlib's setlocale, but additionally check if the charset needs
   OS support and the required codepage is actually installed.  If codepage
   is not available, revert to previous locale and return NULL.  For details
   about codepage availability, see the comment in check_codepage() above. */
extern "C" char *
setlocale (int category, const char *locale)
{
  char old[(LC_MESSAGES + 1) * (ENCODING_LEN + 1/*"/"*/ + 1)];
  if (locale && !wincap.has_always_all_codepages ())
    stpcpy (old, _setlocale_r (_REENT, category, NULL));
  char *ret = _setlocale_r (_REENT, category, locale);
  if (ret && locale && !(ret = check_codepage (ret)))
    _setlocale_r (_REENT, category, old);
  return ret;
}