Ichthyostega
a90b9e5f16
In the Lumiera code base, we use C-String constants as unique error-IDs. Basically this allows to create new unique error IDs anywhere in the code. However, definition of such IDs in arbitrary namespaces tends to create slight confusion and ambiguities, while maintaining the proper use statements requires some manual work. Thus I introduce a new **standard scheme** * Error-IDs for widespread use shall be defined _exclusively_ into `namespace lumiera::error` * The shorthand-Macro `LERR_()` can now be used to simplify inclusion and referral * (for local or single-usage errors, a local or even hidden definition is OK)
109 lines
3.4 KiB
C++
109 lines
3.4 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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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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