janwas
317f98a6c0
archive: pretty much done except for trace and archive_builder IO: io_manager still needs to be fixed/revised (especially WRT buffer and alignment management) posix: done vfs: need to complete vfs_mount and tie it in to vfs.cpp dir_util: needs further revisions (VFS interface changed since then) This was SVN commit r5475.
131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
/**
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* =========================================================================
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* File : path.cpp
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* Project : 0 A.D.
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* Description : manage paths relative to a root directory
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#include "precompiled.h"
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#include "path.h"
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#include <string.h>
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#include "lib/posix/posix_filesystem.h"
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#include "lib/sysdep/sysdep.h" // SYS_DIR_SEP
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#include "lib/path_util.h" // ERR::PATH_LENGTH
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ERROR_ASSOCIATE(ERR::PATH_ROOT_DIR_ALREADY_SET, "Attempting to set FS root dir more than once", -1);
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ERROR_ASSOCIATE(ERR::PATH_NOT_IN_ROOT_DIR, "Accessing a file that's outside of the root dir", -1);
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// set by path_SetRoot
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static char osRootPath[PATH_MAX];
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static size_t osRootPathLength;
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// security check: only allow path_SetRoot once so that malicious code
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// cannot circumvent the VFS checks that disallow access to anything above
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// the current directory (set here).
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// path_SetRoot is called early at startup, so any subsequent attempts
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// are likely bogus.
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// we provide for resetting this from the self-test to allow clean
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// re-init of the individual tests.
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static bool isRootDirEstablished;
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LibError path_SetRoot(const char* argv0, const char* rel_path)
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{
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if(isRootDirEstablished)
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WARN_RETURN(ERR::PATH_ROOT_DIR_ALREADY_SET);
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isRootDirEstablished = true;
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// get full path to executable
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char osPathname[PATH_MAX];
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// .. first try safe, but system-dependent version
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if(sys_get_executable_name(osPathname, PATH_MAX) < 0)
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{
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// .. failed; use argv[0]
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errno = 0;
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if(!realpath(argv0, osPathname))
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return LibError_from_errno();
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}
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// make sure it's valid
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errno = 0;
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if(access(osPathname, X_OK) < 0)
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return LibError_from_errno();
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// strip executable name
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char* name = (char*)path_name_only(osPathname);
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*name = '\0';
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strcat_s(osPathname, ARRAY_SIZE(osRootPath), rel_path);
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// get actual root dir - previous osPathname may include ".."
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// (slight optimization, speeds up path lookup)
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errno = 0;
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if(!realpath(osPathname, osRootPath))
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return LibError_from_errno();
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// .. append SYS_DIR_SEP to simplify code that uses osRootPath
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osRootPathLength = strlen(osRootPath)+1; // +1 for trailing SYS_DIR_SEP
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debug_assert((osRootPathLength+1) < sizeof(osRootPath)); // Just checking
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osRootPath[osRootPathLength-1] = SYS_DIR_SEP;
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// You might think that osRootPath is already 0-terminated, since it's
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// static - but that might not be true after calling path_ResetRootDir!
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osRootPath[osRootPathLength] = 0;
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return INFO::OK;
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}
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void path_ResetRootDir()
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{
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// see comment at isRootDirEstablished.
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debug_assert(isRootDirEstablished);
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osRootPath[0] = '\0';
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osRootPathLength = 0;
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isRootDirEstablished = false;
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}
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// (this assumes SYS_DIR_SEP is a single character)
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static void ConvertSlashCharacters(char* dst, const char* src, char from, char to)
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{
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for(size_t len = 0; len < PATH_MAX; len++)
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{
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char c = *src++;
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if(c == from)
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c = to;
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*dst++ = c;
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// end of string - done
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if(c == '\0')
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return;
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}
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DEBUG_WARN_ERR(ERR::PATH_LENGTH);
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}
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void path_MakeAbsolute(const char* path, char* osPath)
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{
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debug_assert(path != osPath); // doesn't work in-place
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strcpy_s(osPath, PATH_MAX, osRootPath);
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ConvertSlashCharacters(osPath+osRootPathLength, path, '/', SYS_DIR_SEP);
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}
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void path_MakeRelative(const char* osPath, char* path)
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{
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debug_assert(path != osPath); // doesn't work in-place
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if(strncmp(osPath, osRootPath, osRootPathLength) != 0)
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DEBUG_WARN_ERR(ERR::PATH_NOT_IN_ROOT_DIR);
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ConvertSlashCharacters(path, osPath+osRootPathLength, SYS_DIR_SEP, '/');
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}
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