release/src/router/libiconv/lib/c99.h

   1 /*
   2  * Copyright (C) 1999-2002 Free Software Foundation, Inc.
   3  * This file is part of the GNU LIBICONV Library.
   4  *
   5  * The GNU LIBICONV Library is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * The GNU LIBICONV Library is distributed in the hope that it will be
  11  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
  18  * Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 /*
  22  * C99
  23  * This is ASCII with \uXXXX and \UXXXXXXXX escape sequences, denoting Unicode
  24  * characters. See ISO/IEC 9899:1999, section 6.4.3.
  25  * The treatment of control characters in the range U+0080..U+009F is not
  26  * specified; we pass them through unmodified.
  27  */
  28
  29 static int
  30 c99_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  31 {
  32   unsigned char c;
  33   ucs4_t wc;
  34   int i;
  35
  36   c = s[0];
  37   if (c < 0xa0) {
  38     if (c != '\\') {
  39       *pwc = c;
  40       return 1;
  41     }
  42     if (n < 2)
  43       return RET_TOOFEW(0);
  44     c = s[1];
  45     if (c == 'u') {
  46       wc = 0;
  47       for (i = 2; i < 6; i++) {
  48         if (n <= i)
  49           return RET_TOOFEW(0);
  50         c = s[i];
  51         if (c >= '0' && c <= '9')
  52           c -= '0';
  53         else if (c >= 'A' && c <= 'Z')
  54           c -= 'A'-10;
  55         else if (c >= 'a' && c <= 'z')
  56           c -= 'a'-10;
  57         else
  58           goto simply_backslash;
  59         wc |= (ucs4_t) c << (4 * (5-i));
  60       }
  61       if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
  62           || wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
  63         *pwc = wc;
  64         return 6;
  65       }
  66     } else if (c == 'U') {
  67       wc = 0;
  68       for (i = 2; i < 10; i++) {
  69         if (n <= i)
  70           return RET_TOOFEW(0);
  71         c = s[i];
  72         if (c >= '0' && c <= '9')
  73           c -= '0';
  74         else if (c >= 'A' && c <= 'Z')
  75           c -= 'A'-10;
  76         else if (c >= 'a' && c <= 'z')
  77           c -= 'a'-10;
  78         else
  79           goto simply_backslash;
  80         wc |= (ucs4_t) c << (4 * (9-i));
  81       }
  82       if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
  83           || wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
  84         *pwc = wc;
  85         return 10;
  86       }
  87     } else
  88       goto simply_backslash;
  89   }
  90   return RET_ILSEQ;
  91 simply_backslash:
  92   *pwc = '\\';
  93   return 1;
  94 }
  95
  96 static int
  97 c99_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  98 {
  99   if (wc < 0xa0) {
 100     *r = wc;
 101     return 1;
 102   } else {
 103     int result;
 104     unsigned char u;
 105     if (wc < 0x10000) {
 106       result = 6;
 107       u = 'u';
 108     } else {
 109       result = 10;
 110       u = 'U';
 111     }
 112     if (n >= result) {
 113       int count;
 114       r[0] = '\\';
 115       r[1] = u;
 116       r += 2;
 117       for (count = result-3; count >= 0; count--) {
 118         unsigned int i = (wc >> (4*count)) & 0x0f;
 119         *r++ = (i < 10 ? '0'+i : 'a'-10+i);
 120       }
 121       return result;
 122     } else
 123       return RET_TOOSMALL;
 124   }
 125 }