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/* Conversion UCS-4 to UTF-8.
Copyright (C) 2002, 2006-2007, 2009-2018 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2002.
This program is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unistr.h"
#ifndef FALLTHROUGH
# if __GNUC__ < 7
# define FALLTHROUGH ((void) 0)
# else
# define FALLTHROUGH __attribute__ ((__fallthrough__))
# endif
#endif
int
u8_uctomb_aux (uint8_t *s, ucs4_t uc, int n)
{
int count;
if (uc < 0x80)
/* The case n >= 1 is already handled by the caller. */
return -2;
else if (uc < 0x800)
count = 2;
else if (uc < 0x10000)
{
if (uc < 0xd800 || uc >= 0xe000)
count = 3;
else
return -1;
}
else if (uc < 0x110000)
count = 4;
else
return -1;
if (n < count)
return -2;
switch (count) /* note: code falls through cases! */
{
case 4: s[3] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x10000;
FALLTHROUGH;
case 3: s[2] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0x800;
FALLTHROUGH;
case 2: s[1] = 0x80 | (uc & 0x3f); uc = uc >> 6; uc |= 0xc0;
/*case 1:*/ s[0] = uc;
}
return count;
}
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