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Annotation of embedaddon/libiconv/lib/utf8.h, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  * Copyright (C) 1999-2001, 2004, 2016 Free Software Foundation, Inc.
1.1       misho       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.
1.1.1.2 ! misho      17:  * If not, see <https://www.gnu.org/licenses/>.
1.1       misho      18:  */
                     19: 
                     20: /*
                     21:  * UTF-8
                     22:  */
                     23: 
                     24: /* Specification: RFC 3629 */
                     25: 
                     26: static int
1.1.1.2 ! misho      27: utf8_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
1.1       misho      28: {
                     29:   unsigned char c = s[0];
                     30: 
                     31:   if (c < 0x80) {
                     32:     *pwc = c;
                     33:     return 1;
                     34:   } else if (c < 0xc2) {
                     35:     return RET_ILSEQ;
                     36:   } else if (c < 0xe0) {
                     37:     if (n < 2)
                     38:       return RET_TOOFEW(0);
                     39:     if (!((s[1] ^ 0x80) < 0x40))
                     40:       return RET_ILSEQ;
                     41:     *pwc = ((ucs4_t) (c & 0x1f) << 6)
                     42:            | (ucs4_t) (s[1] ^ 0x80);
                     43:     return 2;
                     44:   } else if (c < 0xf0) {
                     45:     if (n < 3)
                     46:       return RET_TOOFEW(0);
                     47:     if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
1.1.1.2 ! misho      48:           && (c >= 0xe1 || s[1] >= 0xa0)
        !            49:           && (c != 0xed || s[1] < 0xa0)))
1.1       misho      50:       return RET_ILSEQ;
                     51:     *pwc = ((ucs4_t) (c & 0x0f) << 12)
                     52:            | ((ucs4_t) (s[1] ^ 0x80) << 6)
                     53:            | (ucs4_t) (s[2] ^ 0x80);
                     54:     return 3;
                     55:   } else if (c < 0xf8 && sizeof(ucs4_t)*8 >= 32) {
                     56:     if (n < 4)
                     57:       return RET_TOOFEW(0);
                     58:     if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
                     59:           && (s[3] ^ 0x80) < 0x40
1.1.1.2 ! misho      60:           && (c >= 0xf1 || s[1] >= 0x90)
        !            61:           && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))))
1.1       misho      62:       return RET_ILSEQ;
                     63:     *pwc = ((ucs4_t) (c & 0x07) << 18)
                     64:            | ((ucs4_t) (s[1] ^ 0x80) << 12)
                     65:            | ((ucs4_t) (s[2] ^ 0x80) << 6)
                     66:            | (ucs4_t) (s[3] ^ 0x80);
                     67:     return 4;
                     68:   } else
                     69:     return RET_ILSEQ;
                     70: }
                     71: 
                     72: static int
1.1.1.2 ! misho      73: utf8_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) /* n == 0 is acceptable */
1.1       misho      74: {
                     75:   int count;
                     76:   if (wc < 0x80)
                     77:     count = 1;
                     78:   else if (wc < 0x800)
                     79:     count = 2;
1.1.1.2 ! misho      80:   else if (wc < 0x10000) {
        !            81:     if (wc < 0xd800 || wc >= 0xe000)
        !            82:       count = 3;
        !            83:     else
        !            84:       return RET_ILUNI;
        !            85:   } else if (wc < 0x110000)
1.1       misho      86:     count = 4;
                     87:   else
                     88:     return RET_ILUNI;
                     89:   if (n < count)
                     90:     return RET_TOOSMALL;
                     91:   switch (count) { /* note: code falls through cases! */
                     92:     case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000;
                     93:     case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800;
                     94:     case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0;
                     95:     case 1: r[0] = wc;
                     96:   }
                     97:   return count;
                     98: }