lib/java.h

   1 /*
   2  * Copyright (C) 1999-2000 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., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * JAVA
  23  * This is ISO 8859-1 with \uXXXX escape sequences, denoting Unicode characters.
  24  */
  25
  26 static int
  27 java_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  28 {
  29   unsigned char c;
  30   ucs4_t wc;
  31   int i;
  32
  33   c = s[0];
  34   if (c != '\\') {
  35     *pwc = c;
  36     return 1;
  37   }
  38   if (n < 2)
  39     return RET_TOOFEW(0);
  40   if (s[1] != 'u')
  41     goto simply_backslash;
  42   wc = 0;
  43   for (i = 2; i < 6; i++) {
  44     if (n <= i)
  45       return RET_TOOFEW(0);
  46     c = s[i];
  47     if (c >= '0' && c <= '9')
  48       c -= '0';
  49     else if (c >= 'A' && c <= 'Z')
  50       c -= 'A'-10;
  51     else if (c >= 'a' && c <= 'z')
  52       c -= 'a'-10;
  53     else
  54       goto simply_backslash;
  55     wc |= (ucs4_t) c << (4 * (5-i));
  56   }
  57   *pwc = wc;
  58   return 6;
  59 simply_backslash:
  60   *pwc = '\\';
  61   return 1;
  62 }
  63
  64 static int
  65 java_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  66 {
  67   if (wc < 0x80) {
  68     *r = wc;
  69     return 1;
  70   } else {
  71     if (n >= 6) {
  72       unsigned int i;
  73       r[0] = '\\';
  74       r[1] = 'u';
  75       i = (wc >> 12) & 0x0f; r[2] = (i < 10 ? '0'+i : 'a'-10+i);
  76       i = (wc >> 8) & 0x0f;  r[3] = (i < 10 ? '0'+i : 'a'-10+i);
  77       i = (wc >> 4) & 0x0f;  r[4] = (i < 10 ? '0'+i : 'a'-10+i);
  78       i = wc & 0x0f;         r[5] = (i < 10 ? '0'+i : 'a'-10+i);
  79       return 6;
  80     } else
  81       return RET_TOOSMALL;
  82   }
  83 }