janwas
1861448e6c
also rename wchar -> utf8 to avoid conflict with <wchar.h> (requires rebuild of workspace) (unfortunately copying history fails to "502 bad gateway"; had to delete old + add new independently) This was SVN commit r7340.
143 lines
4.1 KiB
C++
143 lines
4.1 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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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 "lib/path_util.h"
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#include <cstring>
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#include <cerrno>
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#include "lib/utf8.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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