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97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
/* Copyright (c) 2014, Pollard Banknote Limited
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All rights reserved.
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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 are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND 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 COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "absolute.h"
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#include <climits>
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#include <cstdlib>
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#include "../config/os.h"
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namespace cpp17
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{
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namespace filesystem
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{
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path
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absolute(const path& filename)
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{
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if(!filename.empty())
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{
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#if((defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809l) \
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|| defined(__GLIBC__)) \
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|| defined(ANDROID)
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// Preferred - POSIX-2008 and glibc will allocate the path buffer
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char* res = ::realpath(filename.c_str(), NULL);
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if(res)
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{
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path s = res;
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::free(res);
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return s;
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}
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#else
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#ifdef _GNU_SOURCE
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// Maybe we can rely on the GNU extension
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char* res = ::canonicalize_file_name(filename.c_str());
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if(res)
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{
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std::string s = res;
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::free(res);
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return s;
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}
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#elif(((defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L) \
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|| (defined(_XOPEN_VERSION) && _XOPEN_VERSION >= 500)) \
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&& defined(PATH_MAX))
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/// @todo PATH_MAX may be huge or -1, according to man pages for
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/// realpath
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char resolved[PATH_MAX + 1];
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char* res = ::realpath(filename.c_str(), resolved);
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if(res)
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{
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return resolved;
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}
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#else
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#error "No way to get absolute file path!"
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#endif // if 1
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#endif // if ( defined( _POSIX_VERSION ) && _POSIX_VERSION >= 200809l )
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}
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return path();
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}
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} // namespace filesystem
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} // namespace cpp17
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