Ichthyostega
8ffab2f002
Mostly, std::regexp can be used as a drop-in replacement. Note: unfortunately ECMA regexps do not support lookbehind assertions. This lookbehind is necesary here because we want to allow parsing values from strings with additional content, which means we need explicitly to exclude mismatches due to invalid syntax. We can work around that issue like "either line start, or *not* one of these characters. Alternatively we could consider to make the match more rigid, i.e we would require the string to conain *only* the timecode spec to be parsed.
112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
/*
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Searchpath - helpers for searching directory lists and locating modules
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* *****************************************************/
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/** @file searchpath.cpp
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** Implementation of helpers to handle directory search paths.
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*/
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#include "lib/error.hpp"
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#include "lib/searchpath.hpp"
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#include "lib/symbol.hpp"
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/** how to retrieve the absolute path of the currently running executable
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* on a Linux system: read the link provided by the kernel through /proc
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*/
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#define GET_PATH_TO_EXECUTABLE "/proc/self/exe"
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namespace lib {
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LUMIERA_ERROR_DEFINE (FILE_NOT_DIRECTORY, "path element points at a file instead of a directory");
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using std::regex;
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using std::regex_replace;
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const regex SearchPathSplitter::EXTRACT_PATHSPEC ("[^:]+");
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/** @internal helper to figure out the installation directory,
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* as given by the absolute path of the currently executing program
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* @warning this is Linux specific code */
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string
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findExePath()
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{
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static string buff(lib::STRING_MAX_RELEVANT+1, '\0' );
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if (!buff[0])
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{
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ssize_t chars_read = readlink (GET_PATH_TO_EXECUTABLE, &buff[0], lib::STRING_MAX_RELEVANT);
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if (0 > chars_read || chars_read == ssize_t(lib::STRING_MAX_RELEVANT))
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throw error::Fatal ("unable to discover path of running executable");
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buff.resize(chars_read);
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}
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return buff;
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}
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/** @internal helper to replace all $ORIGIN prefixes in a given string
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* by the directory holding the current executable
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* @note also picks ORIGIN, $ORIGIN/, ORIGIN/
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*/
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string
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replaceMagicLinkerTokens (string const& src)
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{
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static const regex PICK_ORIGIN_TOKEN ("\\$?ORIGIN/?");
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static const string expandedOriginDir
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= fsys::path (findExePath()).parent_path().string() + "/"; ///////////TICKET #896
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return regex_replace(src, PICK_ORIGIN_TOKEN, expandedOriginDir);
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}
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string
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resolveModulePath (fsys::path moduleName, string searchPath)
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{
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fsys::path modulePathName (moduleName);
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SearchPathSplitter searchLocation(searchPath); ///////////TICKET #896
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while (!fsys::exists (modulePathName))
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{
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// try / continue search path
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if (searchLocation.isValid())
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modulePathName = fsys::path() / searchLocation.next() / moduleName;
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else
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throw error::Config ("Module \""+moduleName.string()+"\" not found" /////TICKET #896
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+ (searchPath.empty()? ".":" in search path: "+searchPath));
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}
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TRACE (config, "found module %s", modulePathName.string().c_str());
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return modulePathName.string(); ///////////TICKET #896
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}
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} // namespace lib
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