1 /* Convert UTF-32 string to UTF-16 string.
2 Copyright (C) 2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
5 This program is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
23 #define FUNC u32_to_u16
24 #define SRC_UNIT uint32_t
25 #define DST_UNIT uint16_t
32 FUNC (const SRC_UNIT
*s
, size_t n
, DST_UNIT
*resultbuf
, size_t *lengthp
)
34 const SRC_UNIT
*s_end
= s
+ n
;
35 /* Output string accumulator. */
40 if (resultbuf
!= NULL
)
52 result is either == resultbuf or == NULL or malloc-allocated.
53 If length > 0, then result != NULL. */
60 /* Fetch a Unicode character from the input string. */
62 /* No need to call the safe variant u32_mbtouc, because
63 u16_uctomb will verify uc anyway. */
65 /* Store it in the output string. */
66 count
= u16_uctomb (result
+ length
, uc
, allocated
- length
);
69 if (!(result
== resultbuf
|| result
== NULL
))
78 allocated
= (allocated
> 0 ? 2 * allocated
: 12);
79 if (length
+ 2 > allocated
)
80 allocated
= length
+ 2;
81 if (result
== resultbuf
|| result
== NULL
)
82 memory
= (DST_UNIT
*) malloc (allocated
* sizeof (DST_UNIT
));
85 (DST_UNIT
*) realloc (result
, allocated
* sizeof (DST_UNIT
));
89 if (!(result
== resultbuf
|| result
== NULL
))
94 if (result
== resultbuf
&& length
> 0)
95 memcpy ((char *) memory
, (char *) result
,
96 length
* sizeof (DST_UNIT
));
98 count
= u16_uctomb (result
+ length
, uc
, allocated
- length
);
109 /* Return a non-NULL value. NULL means error. */
110 result
= (DST_UNIT
*) malloc (1);
118 else if (result
!= resultbuf
&& length
< allocated
)
120 /* Shrink the allocated memory if possible. */
123 memory
= (DST_UNIT
*) realloc (result
, length
* sizeof (DST_UNIT
));