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Use commit 0e1e780fd6f18ce93119061e36a4fca9711bc020 Excluded multibuild folder, as this caused git issues
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/*
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Copyright (C) 2013 Equinor ASA, Norway.
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The file 'util_lfs.c' is part of ERT - Ensemble based Reservoir Tool.
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ERT is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ERT is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
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for more details.
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*/
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/*
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This file, together with ifdef and typedef in util.h together try to
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define transparent large file (> 2GB) support on windows and
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linux. To support large files the datatype used to hold a file
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offset must be 64 bit, in practical consequences this means:
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- functions ftell() and fseek() must use 64 bit offset types.
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- The size field in struct stat must be 64 bit.
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On linux (at least on 64 bit platform) this is the deafult,
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i.e. large files can be accessed out of the box. On windows the
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situaton is more complicated:
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- functions ftell() and fseek() expect 32 bit offset types.
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- The size field in struct stat is a 32 bit variable.
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Observe that the situation where 32 bit offset variables are used on
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windows apply even on a 64 bit platform. To provide large file
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support windows has the functions _ftelli64() and _fseeki64() and
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the struct _stat64. Here we provide small wrapper functions
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util_ftell(), util_fseek() and typedef struct stat_info.
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The final challenge is that the types 'long' and 'off_t == long'
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have different size on windows and linux:
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Windows(64 bit): sizeof(long) = 4
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sizeof(off_t) = 4
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Linux(64 bit): sizeof(long) = 8
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sizeof(off_t) = 8
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To protect against this confusion we have typedefed a type
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'offset_type' in util.h, and all file operations should use that type.
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*/
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#include <ert/util/util.h>
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offset_type util_ftell(FILE * stream) {
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#ifdef ERT_WINDOWS_LFS
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return _ftelli64(stream);
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#else
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#ifdef HAVE_FSEEKO
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return ftello(stream);
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#else
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return ftell(stream);
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#endif
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#endif
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}
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int util_fseek(FILE * stream, offset_type offset, int whence) {
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#ifdef ERT_WINDOWS_LFS
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return _fseeki64(stream , offset , whence);
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#else
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#ifdef HAVE_FSEEKO
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return fseeko( stream , offset , whence );
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#else
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return fseek( stream , offset , whence );
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#endif
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#endif
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}
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void util_rewind(FILE * stream) {
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#ifdef ERT_WINDOWS_LFS
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_fseeki64(stream , 0L , SEEK_SET);
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#else
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rewind( stream );
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#endif
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}
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int util_stat(const char * filename , stat_type * stat_info) {
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#ifdef ERT_WINDOWS_LFS
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return _stat64(filename , stat_info);
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#else
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return stat(filename , stat_info);
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#endif
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}
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int util_fstat(int fileno, stat_type * stat_info) {
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#ifdef ERT_WINDOWS_LFS
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return _fstat64(fileno , stat_info);
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#else
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return fstat(fileno , stat_info);
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#endif
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}
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