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78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* Conversion UCS-4 to UTF-8.
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Copyright (C) 2002 Free Software Foundation, Inc.
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Written by Bruno Haible <haible@clisp.cons.org>, 2002.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stddef.h>
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/* Return the length (number of units) of the UTF-8 representation of uc,
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after storing it at S. Return -1 upon failure, -2 if the number of
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available units, N, is too small. */
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static int
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u8_uctomb_aux (unsigned char *s, unsigned int uc, int n)
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{
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int count;
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if (uc < 0x80)
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count = 1;
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else if (uc < 0x800)
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count = 2;
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else if (uc < 0x10000)
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count = 3;
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#if 0
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else if (uc < 0x200000)
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count = 4;
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else if (uc < 0x4000000)
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count = 5;
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else if (uc <= 0x7fffffff)
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count = 6;
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#else
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else if (uc < 0x110000)
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count = 4;
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#endif
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else
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return -1;
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if (n < count)
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return -2;
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switch (count) /* note: code falls through cases! */
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{
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#if 0
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case 6: s[5] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x4000000;
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case 5: s[4] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x200000;
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#endif
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case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
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case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
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case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
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case 1: s[0] = uc;
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}
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return count;
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}
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static inline int
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u8_uctomb (unsigned char *s, unsigned int uc, int n)
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{
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if (uc < 0x80 && n > 0)
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{
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s[0] = uc;
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return 1;
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}
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else
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return u8_uctomb_aux (s, uc, n);
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}
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