121 lines
3.7 KiB
C
121 lines
3.7 KiB
C
/*
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* Copyright (c) 2003, Artem B. Bityuckiy, SoftMine Corporation.
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* Rights transferred to Franklin Electronic Publishers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <reent.h>
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#include <assert.h>
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#include "local.h"
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#ifdef _POSIX_MAPPED_FILES /* Should be defined in unistd.h if mmap/munmap */
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#include <sys/mman.h> /* are supported */
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#endif
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/*
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* _iconv_load_file - load CCS file into memory.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent structure.
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* _CONST char *fname - file name.
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* _iconv_fd_t *desc - CCS file descriptor.
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*
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* DESCRIPTION:
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* _iconv_load_file - is used to load charset file into memory.
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* Uses mmap() if possible. To close file - use _iconv_unload_file.
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*
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* RETURN: 0 if success, -1 if failure.
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*/
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int
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_DEFUN(_iconv_load_file, (rptr, fname, desc),
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struct _reent *rptr _AND
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_CONST char *fname _AND
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_iconv_fd_t *desc)
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{
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int fd;
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#ifndef _POSIX_MAPPED_FILES
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off_t len;
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#endif
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assert(desc != NULL);
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if ((fd = _open_r(rptr, fname, O_RDONLY, S_IRUSR)) < 0)
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return -1;
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if ((desc->len = (size_t)_lseek_r(rptr, fd, 0, SEEK_END)) == (off_t)-1 ||
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_lseek_r(rptr, fd, 0, SEEK_SET) == (off_t)-1)
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goto close_and_exit;
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#ifdef _POSIX_MAPPED_FILES
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if ((desc->mem = _mmap_r(rptr, NULL, desc->len,
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PROT_READ, MAP_FIXED, fd, (off_t)0)) == MAP_FAILED)
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goto close_and_exit;
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#else
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if ((desc->mem = _malloc_r(rptr, desc->len)) == NULL)
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goto close_and_exit;
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if ((len = _read_r(rptr, fd, desc->mem, desc->len)) < 0 || len != desc->len)
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{
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_free_r(rptr, desc->mem);
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goto close_and_exit;
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}
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#endif /* #ifdef _POSIX_MAPPED_FILES */
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_close_r(rptr, fd);
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return 0;
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close_and_exit:
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_close_r(rptr, fd);
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return -1;
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}
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/*
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* _iconv_unload_file - unload file loaded by _iconv_load_file.
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*
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* PARAMETERS:
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* struct _reent *rptr - reent strucutre.
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* _iconv_fd_t *desc - NLS file descriptor.
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*
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* DESCRIPTION:
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* Unloads CCS file previously loaded with _iconv_load_file.
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*
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* RETURN: 0 if success, -1 if failure.
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*/
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int
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_DEFUN(_iconv_unload_file, (rptr, desc),
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struct _reent *rptr _AND
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_iconv_fd_t *desc)
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{
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assert(desc != NULL);
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assert(desc->mem != NULL);
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#ifdef _POSIX_MAPPED_FILES
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assert(desc->len > 0);
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return _munmap_r(rptr, desc->mem, desc->len);
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#else
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_free_r(rptr, desc->mem);
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return 0;
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#endif /* #ifdef _POSIX_MAPPED_FILES */
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}
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