forked from 0ad/0ad
301 lines
8.1 KiB
C++
301 lines
8.1 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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ERROR_ASSOCIATE(ERR::PATH_LENGTH, "Path exceeds PATH_MAX characters", ENAMETOOLONG);
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ERROR_ASSOCIATE(ERR::PATH_EMPTY, "Path is an empty string", -1);
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ERROR_ASSOCIATE(ERR::PATH_NOT_RELATIVE, "Path is not relative", -1);
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ERROR_ASSOCIATE(ERR::PATH_NON_PORTABLE, "Path contains OS-specific dir separator", -1);
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ERROR_ASSOCIATE(ERR::PATH_NON_CANONICAL, "Path contains unsupported .. or ./", -1);
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ERROR_ASSOCIATE(ERR::PATH_COMPONENT_SEPARATOR, "Path component contains dir separator", -1);
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bool path_is_dir_sep(char 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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static bool path_is_dir_sepw(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 == L'/' || c == L'\\')
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return true;
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return false;
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}
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bool path_IsDirectory(const char* path)
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{
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if(path[0] == '\0') // root dir
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return true;
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const char lastChar = path[strlen(path)-1];
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if(path_is_dir_sep(lastChar))
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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 char* s1, const char* s2)
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{
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// make sure s1 is the shorter string
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if(strlen(s1) > strlen(s2))
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std::swap(s1, s2);
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char 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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bool path_is_subpathw(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 == L'\0')
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{
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// s1 matched s2 up until:
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if((c2 == L'\0') || // its end (i.e. they're equal length) OR
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path_is_dir_sepw(c2) || // start of next component OR
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path_is_dir_sepw(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 path is invalid, return a descriptive error code, otherwise INFO::OK.
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LibError path_validate(const char* path)
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{
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// disallow "/", because it would create a second 'root' (with name = "").
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// root dir is "".
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if(path[0] == '/')
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WARN_RETURN(ERR::PATH_NOT_RELATIVE);
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// scan each char in path string; count length.
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int c = 0; // current char; used for .. detection
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size_t path_len = 0;
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for(;;)
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{
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const int last_c = c;
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c = path[path_len++];
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// whole path is too long
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if(path_len >= PATH_MAX)
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WARN_RETURN(ERR::PATH_LENGTH);
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// disallow:
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// - ".." (prevent going above the VFS root dir)
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// - "./" (security hole when mounting and not supported on Windows).
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// allow "/.", because CVS backup files include it.
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if(last_c == '.' && (c == '.' || c == '/'))
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WARN_RETURN(ERR::PATH_NON_CANONICAL);
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// disallow OS-specific dir separators
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if(c == '\\' || c == ':')
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WARN_RETURN(ERR::PATH_NON_PORTABLE);
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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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// 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 char* 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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// copy path strings (provided for convenience).
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void path_copy(char* dst, const char* src)
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{
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strcpy_s(dst, PATH_MAX, src);
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}
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// combine <path1> and <path2> into one path, and write to <dst>.
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// if necessary, a directory separator is added between the paths.
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// each may be empty, filenames, or full paths.
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// total path length (including '\0') must not exceed PATH_MAX.
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void path_append(char* dst, const char* path1, const char* path2, size_t flags)
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{
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const size_t len1 = strlen(path1);
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const size_t len2 = strlen(path2);
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size_t total_len = len1 + len2 + 1; // includes '\0'
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const bool no_end_slash1 = (len1 == 0 || !path_is_dir_sep(path1[len1-1]));
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const bool no_end_slash2 = (len2 == 0 || !path_is_dir_sep(path2[len2-1]));
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// check if we need to add '/' between path1 and path2
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// notes:
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// - the second can't start with '/' (not allowed by path_validate)
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// - must check len2 as well - if it's empty, we'd end up
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// inadvertently terminating the string with '/'.
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bool need_separator = false;
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if(len2 != 0 && len1 != 0 && no_end_slash1)
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{
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total_len++; // for '/'
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need_separator = true;
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}
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// check if trailing slash requested and not already present
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bool need_terminator = false;
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if(flags & PATH_APPEND_SLASH && no_end_slash2)
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{
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total_len++; // for '/'
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need_terminator = true;
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}
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if(total_len > PATH_MAX)
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{
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DEBUG_WARN_ERR(ERR::PATH_LENGTH);
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*dst = 0;
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return;
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}
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SAFE_STRCPY(dst, path1);
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dst += len1;
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if(need_separator)
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*dst++ = '/';
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SAFE_STRCPY(dst, path2);
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if(need_terminator)
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SAFE_STRCPY(dst+len2, "/");
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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 char* path_name_only(const char* path)
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{
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const char* slash1 = strrchr(path, '/');
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const char* slash2 = strrchr(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 portable or platform slash
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const char* 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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// if <path> contains a name component, it is stripped away.
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void path_strip_fn(char* path)
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{
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char* name = (char*)path_name_only(path);
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*name = '\0'; // cut off string here
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debug_assert(path_IsDirectory(path));
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}
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// return extension of <fn>, or "" if there is none.
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// NOTE: does not include the period; e.g. "a.bmp" yields "bmp".
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const char* path_extension(const char* fn)
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{
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const char* dot = strrchr(fn, '.');
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if(!dot)
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return "";
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const char* ext = dot+1;
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return ext;
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}
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