reactos/lib/crtdll/old cruft/stdlib/wcstombs.c

   1 /* Copyright (C) 1991, 1992, 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <msvcrt/stdlib.h>
  20 #include <msvcrt/wchar.h>
  21
  22 #include <msvcrt/errno.h>
  23 #include <msvcrt/wchar.h>
  24
  25 #ifndef EILSEQ
  26 #define EILSEQ EINVAL
  27 #endif
  28
  29
  30 static const wchar_t encoding_mask[] =
  31 {
  32   ~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff
  33 };
  34
  35 static const unsigned char encoding_byte[] =
  36 {
  37   0xc0, 0xe0, 0xf0, 0xf8, 0xfc
  38 };
  39
  40 /* We don't need the state really because we don't have shift states
  41    to maintain between calls to this function.  */
  42 typedef int mbstate_t;
  43 static mbstate_t mbstate_internal;
  44
  45
  46 mbstate_t __no_r_state;  /* Now defined in wcstombs.c.  */
  47 //extern mbstate_t __no_r_state;  /* Defined in mbtowc.c.  */
  48
  49 size_t
  50 __wcsrtombs (char *dst, const wchar_t **src, size_t len, mbstate_t *ps);
  51
  52 /* Convert the `wchar_t' string in PWCS to a multibyte character string
  53  * in S, writing no more than N characters.  Return the number of bytes
  54  * written, or (size_t) -1 if an invalid `wchar_t' was found.
  55  *
  56  * Attention: this function should NEVER be intentionally used.
  57  * The interface is completely stupid.  The state is shared between
  58  * all conversion functions.  You should use instead the restartable
  59  * version `wcsrtombs'.
  60  *
  61  * @implemented
  62  */
  63 size_t
  64 wcstombs (char *s, const wchar_t *pwcs, size_t n)
  65 {
  66   mbstate_t save_shift = __no_r_state;
  67   size_t written;
  68
  69   written = __wcsrtombs (s, &pwcs, n, &__no_r_state);
  70
  71   /* Restore the old shift state.  */
  72   __no_r_state = save_shift;
  73
  74   /* Return how many we wrote (or maybe an error).  */
  75   return written;
  76 }
  77
  78 size_t
  79 __wcsrtombs (char *dst, const wchar_t **src, size_t len, mbstate_t *ps)
  80 {
  81   size_t written = 0;
  82   const wchar_t *run = *src;
  83
  84   if (ps == NULL)
  85     ps = &mbstate_internal;
  86
  87   if (dst == NULL)
  88     /* The LEN parameter has to be ignored if we don't actually write
  89        anything.  */
  90     len = ~0;
  91
  92   while (written < len)
  93     {
  94       wchar_t wc = *run++;
  95
  96       if (wc < 0 || wc > 0x7fffffff)
  97         {
  98           /* This is no correct ISO 10646 character.  */
  99           __set_errno (EILSEQ);
 100           return (size_t) -1;
 101         }
 102
 103       if (wc == L'\0')
 104         {
 105           /* Found the end.  */
 106           if (dst != NULL)
 107             *dst = '\0';
 108           *src = NULL;
 109           return written;
 110         }
 111       else if (wc < 0x80)
 112         {
 113           /* It's an one byte sequence.  */
 114           if (dst != NULL)
 115             *dst++ = (char) wc;
 116           ++written;
 117         }
 118       else
 119         {
 120           size_t step;
 121
 122           for (step = 2; step < 6; ++step)
 123             if ((wc & encoding_mask[step - 2]) == 0)
 124               break;
 125
 126           if (written + step >= len)
 127             /* Too long.  */
 128             break;
 129
 130           if (dst != NULL)
 131             {
 132               size_t cnt = step;
 133
 134               dst[0] = encoding_byte[cnt - 2];
 135
 136               --cnt;
 137               do
 138                 {
 139                   dst[cnt] = 0x80 | (wc & 0x3f);
 140                   wc >>= 6;
 141                 }
 142               while (--cnt > 0);
 143               dst[0] |= wc;
 144
 145               dst += step;
 146             }
 147
 148           written += step;
 149         }
 150     }
 151
 152   /* Store position of first unprocessed word.  */
 153   *src = run;
 154
 155   return written;
 156 }
 157 //weak_alias (__wcsrtombs, wcsrtombs)