diff options
Diffstat (limited to 'lib/uniconv/u16-conv-to-enc.c')
| -rw-r--r-- | lib/uniconv/u16-conv-to-enc.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/lib/uniconv/u16-conv-to-enc.c b/lib/uniconv/u16-conv-to-enc.c new file mode 100644 index 00000000..ba70736c --- /dev/null +++ b/lib/uniconv/u16-conv-to-enc.c @@ -0,0 +1,177 @@ +/* Conversion from UTF-16 to legacy encodings. + Copyright (C) 2002, 2006-2008 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify it + under the terms of 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. + + 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 <http://www.gnu.org/licenses/>. */ + +/* Written by Bruno Haible <bruno@clisp.org>. */ + +#include <config.h> + +/* Specification. */ +#include "uniconv.h" + +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +#include "striconveha.h" +#include "unistr.h" + +#define SIZEOF(array) (sizeof (array) / sizeof (array[0])) + +/* Name of UTF-16 encoding with machine dependent endianness and alignment. */ +#if defined _LIBICONV_VERSION || (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) +# ifdef WORDS_BIGENDIAN +# define UTF16_NAME "UTF-16BE" +# else +# define UTF16_NAME "UTF-16LE" +# endif +#endif + + +#if !defined UTF16_NAME + +/* A variant of u16_to_u8 that treats an incomplete sequence of units at the + end as a harmless no-op, rather than reporting it as an EILSEQ error. */ + +#define FUNC u16_to_u8_lenient +#define SRC_UNIT uint16_t +#define DST_UNIT uint8_t + +static DST_UNIT * +FUNC (const SRC_UNIT *s, size_t n, DST_UNIT *resultbuf, size_t *lengthp) +{ + const SRC_UNIT *s_end = s + n; + /* Output string accumulator. */ + DST_UNIT *result; + size_t allocated; + size_t length; + + if (resultbuf != NULL) + { + result = resultbuf; + allocated = *lengthp; + } + else + { + result = NULL; + allocated = 0; + } + length = 0; + /* Invariants: + result is either == resultbuf or == NULL or malloc-allocated. + If length > 0, then result != NULL. */ + + while (s < s_end) + { + ucs4_t uc; + int count; + + /* Fetch a Unicode character from the input string. */ + count = u16_mbtoucr (&uc, s, s_end - s); + if (count < 0) + { + if (count == -2) + /* Incomplete sequence of units. */ + break; + if (!(result == resultbuf || result == NULL)) + free (result); + errno = EILSEQ; + return NULL; + } + s += count; + + /* Store it in the output string. */ + count = u8_uctomb (result + length, uc, allocated - length); + if (count == -1) + { + if (!(result == resultbuf || result == NULL)) + free (result); + errno = EILSEQ; + return NULL; + } + if (count == -2) + { + DST_UNIT *memory; + + allocated = (allocated > 0 ? 2 * allocated : 12); + if (length + 6 > allocated) + allocated = length + 6; + if (result == resultbuf || result == NULL) + memory = (DST_UNIT *) malloc (allocated * sizeof (DST_UNIT)); + else + memory = + (DST_UNIT *) realloc (result, allocated * sizeof (DST_UNIT)); + + if (memory == NULL) + { + if (!(result == resultbuf || result == NULL)) + free (result); + errno = ENOMEM; + return NULL; + } + if (result == resultbuf && length > 0) + memcpy ((char *) memory, (char *) result, + length * sizeof (DST_UNIT)); + result = memory; + count = u8_uctomb (result + length, uc, allocated - length); + if (count < 0) + abort (); + } + length += count; + } + + if (length == 0) + { + if (result == NULL) + { + /* Return a non-NULL value. NULL means error. */ + result = (DST_UNIT *) malloc (1); + if (result == NULL) + { + errno = ENOMEM; + return NULL; + } + } + } + else if (result != resultbuf && length < allocated) + { + /* Shrink the allocated memory if possible. */ + DST_UNIT *memory; + + memory = (DST_UNIT *) realloc (result, length * sizeof (DST_UNIT)); + if (memory != NULL) + result = memory; + } + + *lengthp = length; + return result; +} + +#undef DST_UNIT +#undef SRC_UNIT +#undef FUNC + +#endif + + +#define FUNC u16_conv_to_encoding +#define UNIT uint16_t +#define U_TO_U8 u16_to_u8_lenient +#define U_MBLEN u16_mblen +#if defined UTF16_NAME +# define UTF_NAME UTF16_NAME +# define HAVE_UTF_NAME 1 +#endif +#include "u-conv-to-enc.h" |