Mercurial > hg > octave-lojdl > gnulib-hg
changeset 7809:aba72e7f7432
New module 'unistr/u16-to-u8'.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Tue, 09 Jan 2007 14:02:57 +0000 |
parents | 430eccb7818f |
children | 482157cff083 |
files | lib/unistr/u16-to-u8.c modules/unistr/u16-to-u8 |
diffstat | 2 files changed, 161 insertions(+), 0 deletions(-) [+] |
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new file mode 100644 --- /dev/null +++ b/lib/unistr/u16-to-u8.c @@ -0,0 +1,138 @@ +/* Convert UTF-16 string to UTF-8 string. + Copyright (C) 2002, 2006 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 the GNU Library General Public License as published + by the Free Software Foundation; either version 2, 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + USA. */ + +#include <config.h> + +/* Specification. */ +#include "unistr.h" + +#define FUNC u16_to_u8 +#define SRC_UNIT uint16_t +#define DST_UNIT uint8_t + +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +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_mbtouc_safe (&uc, s, s_end - s); + if (count < 0) + { + if (!(result == resultbuf || result == NULL)) + free (result); + errno = EILSEQ; + return NULL; + } + s += count; + + /* Store it in the output string. */ + count = u8_uctomb (result, 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, 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; +}
new file mode 100644 --- /dev/null +++ b/modules/unistr/u16-to-u8 @@ -0,0 +1,23 @@ +Description: +Convert UTF-16 string to UTF-8 string. + +Files: +lib/unistr/u16-to-u8.c + +Depends-on: +unistr/base + +configure.ac: + +Makefile.am: +lib_SOURCES += unistr/u16-to-u8.c + +Include: +"unistr.h" + +License: +LGPL + +Maintainer: +Bruno Haible +