janwas
450da0aaf7
add safer/more portable/less dependent on locale implementation of wchar_t <-> UTF8 This was SVN commit r7185.
138 lines
3.7 KiB
C++
138 lines
3.7 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* helper functions for path strings.
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*/
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#include "precompiled.h"
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#include "path_util.h"
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#include <cstring>
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#include <cerrno>
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#include "lib/wchar.h"
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ERROR_ASSOCIATE(ERR::PATH_EMPTY, L"path is an empty string", -1);
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ERROR_ASSOCIATE(ERR::PATH_COMPONENT_SEPARATOR, L"path component contains dir separator", -1);
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ERROR_ASSOCIATE(ERR::PATH_NOT_FOUND, L"path not found", -1);
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bool path_is_dir_sep(wchar_t c)
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{
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// note: ideally path strings would only contain '/' or even SYS_DIR_SEP.
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// however, windows-specific code (e.g. the sound driver detection)
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// uses these routines with '\\' strings. converting them all to
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// '/' and then back before passing to WinAPI would be annoying.
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// also, the self-tests verify correct operation of such strings.
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// it would be error-prone to only test the platform's separator
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// strings there. hence, we allow all separators here.
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if(c == '/' || c == '\\')
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return true;
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return false;
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}
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// is s2 a subpath of s1, or vice versa?
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// (equal counts as subpath)
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bool path_is_subpath(const wchar_t* s1, const wchar_t* s2)
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{
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// make sure s1 is the shorter string
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if(wcslen(s1) > wcslen(s2))
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std::swap(s1, s2);
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wchar_t c1 = 0, last_c1, c2;
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for(;;)
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{
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last_c1 = c1;
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c1 = *s1++, c2 = *s2++;
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// end of s1 reached:
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if(c1 == '\0')
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{
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// s1 matched s2 up until:
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if((c2 == '\0') || // its end (i.e. they're equal length) OR
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path_is_dir_sep(c2) || // start of next component OR
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path_is_dir_sep(last_c1)) // ", but both have a trailing slash
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// => is subpath
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return true;
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}
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// mismatch => is not subpath
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if(c1 != c2)
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return false;
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}
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}
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// if name is invalid, return a descriptive error code, otherwise INFO::OK.
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// (name is a path component, i.e. that between directory separators)
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LibError path_component_validate(const wchar_t* name)
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{
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// disallow empty strings
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if(*name == '\0')
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WARN_RETURN(ERR::PATH_EMPTY);
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for(;;)
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{
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const int c = *name++;
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// disallow *any* dir separators (regardless of which
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// platform we're on).
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if(c == '\\' || c == ':' || c == '/')
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WARN_RETURN(ERR::PATH_COMPONENT_SEPARATOR);
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// end of string, no errors encountered
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if(c == '\0')
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break;
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}
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return INFO::OK;
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}
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//-----------------------------------------------------------------------------
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// return pointer to the name component within path (i.e. skips over all
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// characters up to the last dir separator, if any).
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const wchar_t* path_name_only(const wchar_t* path)
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{
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const wchar_t* slash1 = wcsrchr(path, '/');
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const wchar_t* slash2 = wcsrchr(path, '\\');
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// neither present, it's a filename only
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if(!slash1 && !slash2)
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return path;
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// return name, i.e. component after the last slash
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const wchar_t* name = std::max(slash1, slash2)+1;
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if(name[0] != '\0') // else path_component_validate would complain
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path_component_validate(name);
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return name;
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}
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fs::wpath wpath_from_path(const fs::path& pathname)
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{
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return wstring_from_UTF8(pathname.string());
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}
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fs::path path_from_wpath(const fs::wpath& pathname)
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{
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return UTF8_from_wstring(pathname.string());
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}
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