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everywhere not just some places, get rid of . and .. when joining path sections together. This should eliminate most of the ugly paths like /foo/bar/./baz that we've been generating.
652 lines
13 KiB
C
652 lines
13 KiB
C
/*-------------------------------------------------------------------------
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*
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* path.c
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* portable path handling routines
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*
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* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/port/path.c,v 1.42 2004/11/06 01:16:22 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#include <ctype.h>
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#include "pg_config_paths.h"
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#ifndef WIN32
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#define IS_DIR_SEP(ch) ((ch) == '/')
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#else
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#define IS_DIR_SEP(ch) ((ch) == '/' || (ch) == '\\')
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#endif
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#ifndef WIN32
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#define IS_PATH_SEP(ch) ((ch) == ':')
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#else
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#define IS_PATH_SEP(ch) ((ch) == ';')
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#endif
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static const char *relative_path(const char *bin_path, const char *other_path);
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static void make_relative(const char *my_exec_path, const char *p, char *ret_path);
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static void trim_directory(char *path);
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static void trim_trailing_separator(char *path);
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/* Move to last of consecutive separators or to null byte */
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#define MOVE_TO_SEP_END(p) \
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{ \
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while (IS_DIR_SEP((p)[0]) && (IS_DIR_SEP((p)[1]) || !(p)[1])) \
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(p)++; \
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}
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/*
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* skip_drive
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*
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* On Windows, a path may begin with "C:" or "//network/". Advance over
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* this and point to the effective start of the path.
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*/
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#ifdef WIN32
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static char *
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skip_drive(const char *path)
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{
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if (IS_DIR_SEP(path[0]) && IS_DIR_SEP(path[1]))
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{
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path += 2;
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while (*path && !IS_DIR_SEP(*path))
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path++;
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}
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else if (isalpha(path[0]) && path[1] == ':')
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{
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path += 2;
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}
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return (char *) path;
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}
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#else
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#define skip_drive(path) (path)
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#endif
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/*
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* first_dir_separator
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*
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* Find the location of the first directory separator, return
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* NULL if not found.
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*/
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char *
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first_dir_separator(const char *filename)
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{
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const char *p;
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for (p = skip_drive(filename); *p; p++)
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if (IS_DIR_SEP(*p))
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return (char *) p;
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return NULL;
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}
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/*
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* first_path_separator
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*
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* Find the location of the first path separator (i.e. ':' on
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* Unix, ';' on Windows), return NULL if not found.
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*/
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char *
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first_path_separator(const char *pathlist)
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{
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const char *p;
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/* skip_drive is not needed */
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for (p = pathlist; *p; p++)
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if (IS_PATH_SEP(*p))
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return (char *) p;
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return NULL;
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}
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/*
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* last_dir_separator
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*
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* Find the location of the last directory separator, return
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* NULL if not found.
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*/
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char *
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last_dir_separator(const char *filename)
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{
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const char *p,
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*ret = NULL;
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for (p = skip_drive(filename); *p; p++)
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if (IS_DIR_SEP(*p))
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ret = p;
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return (char *) ret;
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}
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/*
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* make_native_path - on WIN32, change / to \ in the path
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*
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* This effectively undoes canonicalize_path.
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*
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* This is required because WIN32 COPY is an internal CMD.EXE
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* command and doesn't process forward slashes in the same way
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* as external commands. Quoting the first argument to COPY
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* does not convert forward to backward slashes, but COPY does
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* properly process quoted forward slashes in the second argument.
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*
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* COPY works with quoted forward slashes in the first argument
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* only if the current directory is the same as the directory
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* of the first argument.
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*/
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void
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make_native_path(char *filename)
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{
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#ifdef WIN32
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char *p;
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for (p = filename; *p; p++)
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if (*p == '/')
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*p = '\\';
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#endif
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}
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/*
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* join_path_components - join two path components, inserting a slash
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*
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* ret_path is the output area (must be of size MAXPGPATH)
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*
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* ret_path can be the same as head, but not the same as tail.
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*/
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void
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join_path_components(char *ret_path,
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const char *head, const char *tail)
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{
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if (ret_path != head)
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StrNCpy(ret_path, head, MAXPGPATH);
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/*
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* Remove any leading "." and ".." in the tail component,
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* adjusting head as needed.
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*/
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for (;;)
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{
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if (tail[0] == '.' && IS_DIR_SEP(tail[1]))
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{
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tail += 2;
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}
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else if (tail[0] == '.' && tail[1] == '\0')
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{
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tail += 1;
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break;
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}
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else if (tail[0] == '.' && tail[1] == '.' && IS_DIR_SEP(tail[2]))
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{
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trim_directory(ret_path);
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tail += 3;
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}
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else if (tail[0] == '.' && tail[1] == '.' && tail[2] == '\0')
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{
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trim_directory(ret_path);
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tail += 2;
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break;
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}
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else
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break;
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}
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if (*tail)
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snprintf(ret_path + strlen(ret_path), MAXPGPATH - strlen(ret_path),
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"/%s", tail);
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}
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/*
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* Clean up path by:
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* o make Win32 path use Unix slashes
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* o remove trailing quote on Win32
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* o remove trailing slash
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* o remove trailing '.'
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* o process trailing '..' ourselves
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*/
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void
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canonicalize_path(char *path)
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{
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#ifdef WIN32
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/*
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* The Windows command processor will accept suitably quoted paths
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* with forward slashes, but barfs badly with mixed forward and back
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* slashes.
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*/
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char *p;
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for (p = path; *p; p++)
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{
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if (*p == '\\')
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*p = '/';
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}
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/*
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* In Win32, if you do: prog.exe "a b" "\c\d\" the system will pass
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* \c\d" as argv[2].
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*/
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if (p > path && *(p - 1) == '"')
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*(p - 1) = '/';
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#endif
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/*
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* Removing the trailing slash on a path means we never get ugly
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* double trailing slashes. Also, Win32 can't stat() a directory
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* with a trailing slash. Don't remove a leading slash, though.
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*/
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trim_trailing_separator(path);
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/*
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* Remove any trailing uses of "." and process ".." ourselves
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*/
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for (;;)
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{
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int len = strlen(path);
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if (len >= 2 && strcmp(path + len - 2, "/.") == 0)
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{
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trim_directory(path);
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}
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else if (len >= 3 && strcmp(path + len - 3, "/..") == 0)
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{
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trim_directory(path);
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trim_directory(path); /* remove directory above */
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}
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else
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break;
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}
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}
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/*
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* Extracts the actual name of the program as called -
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* stripped of .exe suffix if any
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*/
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const char *
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get_progname(const char *argv0)
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{
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const char *nodir_name;
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nodir_name = last_dir_separator(argv0);
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if (nodir_name)
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nodir_name++;
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else
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nodir_name = skip_drive(argv0);
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#if defined(__CYGWIN__) || defined(WIN32)
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/* strip .exe suffix, regardless of case */
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if (strlen(nodir_name) > sizeof(EXE) - 1 &&
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pg_strcasecmp(nodir_name + strlen(nodir_name)-sizeof(EXE)-1, EXE) == 0)
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{
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char *progname;
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progname = strdup(nodir_name);
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if (progname == NULL)
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{
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fprintf(stderr, "%s: out of memory\n", nodir_name);
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exit(1); /* This could exit the postmaster */
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}
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progname[strlen(progname) - sizeof(EXE) - 1] = '\0';
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nodir_name = progname;
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}
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#endif
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return nodir_name;
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}
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/*
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* get_share_path
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*/
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void
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get_share_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, PGSHAREDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, PGSHAREDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_etc_path
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*/
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void
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get_etc_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, SYSCONFDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, SYSCONFDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_include_path
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*/
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void
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get_include_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, INCLUDEDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, INCLUDEDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_pkginclude_path
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*/
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void
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get_pkginclude_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, PKGINCLUDEDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, PKGINCLUDEDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_includeserver_path
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*/
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void
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get_includeserver_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, INCLUDEDIRSERVER)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, INCLUDEDIRSERVER, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_lib_path
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*/
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void
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get_lib_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, LIBDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, LIBDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_pkglib_path
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*/
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void
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get_pkglib_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, PKGLIBDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, PKGLIBDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_locale_path
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*
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* Return locale path, either relative to /bin or hardcoded
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*/
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void
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get_locale_path(const char *my_exec_path, char *ret_path)
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{
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const char *p;
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if ((p = relative_path(PGBINDIR, LOCALEDIR)))
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make_relative(my_exec_path, p, ret_path);
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else
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StrNCpy(ret_path, LOCALEDIR, MAXPGPATH);
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canonicalize_path(ret_path);
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}
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/*
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* get_home_path
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*/
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bool
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get_home_path(char *ret_path)
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{
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if (getenv(HOMEDIR) == NULL)
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{
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*ret_path = '\0';
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return false;
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}
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else
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{
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StrNCpy(ret_path, getenv(HOMEDIR), MAXPGPATH);
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canonicalize_path(ret_path);
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return true;
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}
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}
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/*
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* get_parent_directory
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*
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* Modify the given string in-place to name the parent directory of the
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* named file.
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*/
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void
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get_parent_directory(char *path)
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{
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trim_directory(path);
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}
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/*
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* set_pglocale_pgservice
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*
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* Set application-specific locale and service directory
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*
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* This function takes an argv[0] rather than a full path.
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*/
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void
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set_pglocale_pgservice(const char *argv0, const char *app)
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{
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char path[MAXPGPATH];
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char my_exec_path[MAXPGPATH];
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char env_path[MAXPGPATH + sizeof("PGSYSCONFDIR=")]; /* longer than
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* PGLOCALEDIR */
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/* don't set LC_ALL in the backend */
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if (strcmp(app, "postgres") != 0)
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setlocale(LC_ALL, "");
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if (find_my_exec(argv0, my_exec_path) < 0)
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return;
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#ifdef ENABLE_NLS
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get_locale_path(my_exec_path, path);
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bindtextdomain(app, path);
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textdomain(app);
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if (getenv("PGLOCALEDIR") == NULL)
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{
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/* set for libpq to use */
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snprintf(env_path, sizeof(env_path), "PGLOCALEDIR=%s", path);
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canonicalize_path(env_path + 12);
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putenv(strdup(env_path));
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}
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#endif
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if (getenv("PGSYSCONFDIR") == NULL)
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{
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get_etc_path(my_exec_path, path);
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/* set for libpq to use */
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snprintf(env_path, sizeof(env_path), "PGSYSCONFDIR=%s", path);
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canonicalize_path(env_path + 13);
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putenv(strdup(env_path));
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}
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}
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/*
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* make_relative - adjust path to be relative to bin/
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*
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* ret_path is the output area (must be of size MAXPGPATH)
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*/
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static void
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make_relative(const char *my_exec_path, const char *p, char *ret_path)
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{
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char path[MAXPGPATH];
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StrNCpy(path, my_exec_path, MAXPGPATH);
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trim_directory(path); /* remove my executable name */
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trim_directory(path); /* remove last directory component (/bin) */
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join_path_components(ret_path, path, p);
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}
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/*
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* relative_path
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*
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* Do the supplied paths differ only in their last component?
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*/
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static const char *
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relative_path(const char *bin_path, const char *other_path)
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{
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#ifdef WIN32
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/* Driver letters match? */
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if (isalpha(*bin_path) && bin_path[1] == ':' &&
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(!isalpha(*other_path) || !other_path[1] == ':'))
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return NULL;
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if ((!isalpha(*bin_path) || !bin_path[1] == ':') &&
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(isalpha(*other_path) && other_path[1] == ':'))
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return NULL;
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if (isalpha(*bin_path) && bin_path[1] == ':' &&
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isalpha(*other_path) && other_path[1] == ':')
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{
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if (toupper(*bin_path) != toupper(*other_path))
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return NULL;
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bin_path += 2;
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other_path += 2;
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}
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#endif
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while (1)
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{
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/* Move past adjacent slashes like //, and trailing ones */
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MOVE_TO_SEP_END(bin_path);
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MOVE_TO_SEP_END(other_path);
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/* One of the paths is done? */
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if (!*bin_path || !*other_path)
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break;
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/* Win32 filesystem is case insensitive */
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if ((!IS_DIR_SEP(*bin_path) || !IS_DIR_SEP(*other_path)) &&
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#ifndef WIN32
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*bin_path != *other_path
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#else
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toupper((unsigned char) *bin_path) != toupper((unsigned char) *other_path)
|
|
#endif
|
|
)
|
|
break;
|
|
|
|
bin_path++;
|
|
other_path++;
|
|
}
|
|
|
|
/* identical? */
|
|
if (!*bin_path && !*other_path)
|
|
return NULL;
|
|
|
|
/* advance past directory name */
|
|
while (!IS_DIR_SEP(*bin_path) && *bin_path)
|
|
bin_path++;
|
|
|
|
MOVE_TO_SEP_END(bin_path);
|
|
|
|
/* Is bin done? */
|
|
if (!*bin_path)
|
|
return other_path;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* trim_directory
|
|
*
|
|
* Trim trailing directory from path, that is, remove any trailing slashes,
|
|
* the last pathname component, and the slash just ahead of it --- but never
|
|
* remove a leading slash.
|
|
*/
|
|
static void
|
|
trim_directory(char *path)
|
|
{
|
|
char *p;
|
|
|
|
path = skip_drive(path);
|
|
|
|
if (path[0] == '\0')
|
|
return;
|
|
|
|
/* back up over trailing slash(es) */
|
|
for (p = path + strlen(path) - 1; IS_DIR_SEP(*p) && p > path; p--)
|
|
;
|
|
/* back up over directory name */
|
|
for (; !IS_DIR_SEP(*p) && p > path; p--)
|
|
;
|
|
/* if multiple slashes before directory name, remove 'em all */
|
|
for (; p > path && IS_DIR_SEP(*(p - 1)); p--)
|
|
;
|
|
/* don't erase a leading slash */
|
|
if (p == path && IS_DIR_SEP(*p))
|
|
p++;
|
|
*p = '\0';
|
|
}
|
|
|
|
|
|
/*
|
|
* trim_trailing_separator
|
|
*
|
|
* trim off trailing slashes, but not a leading slash
|
|
*/
|
|
static void
|
|
trim_trailing_separator(char *path)
|
|
{
|
|
char *p;
|
|
|
|
path = skip_drive(path);
|
|
p = path + strlen(path);
|
|
if (p > path)
|
|
for (p--; p > path && IS_DIR_SEP(*p); p--)
|
|
*p = '\0';
|
|
}
|