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125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/*
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* Copyright (C) 1999-2002, 2016 Free Software Foundation, Inc.
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* This file is part of the GNU LIBICONV Library.
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*
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* The GNU LIBICONV Library is free software; you can redistribute it
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* and/or modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* The GNU LIBICONV Library is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* C99
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* This is ASCII with \uXXXX and \UXXXXXXXX escape sequences, denoting Unicode
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* characters. See ISO/IEC 9899:1999, section 6.4.3.
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* The treatment of control characters in the range U+0080..U+009F is not
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* specified; we pass them through unmodified.
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*/
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static int
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c99_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
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{
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unsigned char c;
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ucs4_t wc;
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int i;
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c = s[0];
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if (c < 0xa0) {
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if (c != '\\') {
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*pwc = c;
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return 1;
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}
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if (n < 2)
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return RET_TOOFEW(0);
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c = s[1];
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if (c == 'u') {
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wc = 0;
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for (i = 2; i < 6; i++) {
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if (n <= i)
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return RET_TOOFEW(0);
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c = s[i];
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if (c >= '0' && c <= '9')
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c -= '0';
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else if (c >= 'A' && c <= 'Z')
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c -= 'A'-10;
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else if (c >= 'a' && c <= 'z')
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c -= 'a'-10;
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else
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goto simply_backslash;
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wc |= (ucs4_t) c << (4 * (5-i));
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}
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if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
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|| wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
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*pwc = wc;
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return 6;
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}
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} else if (c == 'U') {
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wc = 0;
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for (i = 2; i < 10; i++) {
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if (n <= i)
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return RET_TOOFEW(0);
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c = s[i];
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if (c >= '0' && c <= '9')
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c -= '0';
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else if (c >= 'A' && c <= 'Z')
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c -= 'A'-10;
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else if (c >= 'a' && c <= 'z')
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c -= 'a'-10;
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else
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goto simply_backslash;
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wc |= (ucs4_t) c << (4 * (9-i));
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}
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if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
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|| wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
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*pwc = wc;
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return 10;
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}
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} else
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goto simply_backslash;
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}
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return RET_ILSEQ;
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simply_backslash:
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*pwc = '\\';
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return 1;
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}
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static int
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c99_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
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{
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if (wc < 0xa0) {
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*r = wc;
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return 1;
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} else {
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int result;
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unsigned char u;
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if (wc < 0x10000) {
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result = 6;
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u = 'u';
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} else {
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result = 10;
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u = 'U';
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}
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if (n >= result) {
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int count;
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r[0] = '\\';
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r[1] = u;
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r += 2;
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for (count = result-3; count >= 0; count--) {
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unsigned int i = (wc >> (4*count)) & 0x0f;
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*r++ = (i < 10 ? '0'+i : 'a'-10+i);
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}
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return result;
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} else
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return RET_TOOSMALL;
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}
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}
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