gdbsupport/pathstuff.h

/* Path manipulation routines for GDB and gdbserver.

   Copyright (C) 1986-2024 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef GDBSUPPORT_PATHSTUFF_H
#define GDBSUPPORT_PATHSTUFF_H

#include "gdbsupport/byte-vector.h"
#include "gdbsupport/array-view.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <array>

/* Path utilities.  */

/* String containing the current directory (what getwd would return).  */
extern char *current_directory;

/* Return the real path of FILENAME, expanding all the symbolic links.

   Contrary to "gdb_abspath", this function does not use
   CURRENT_DIRECTORY for path expansion.  Instead, it relies on the
   current working directory (CWD) of GDB or gdbserver.  */

extern gdb::unique_xmalloc_ptr<char> gdb_realpath (const char *filename);

/* Return a copy of FILENAME, with its directory prefix canonicalized
   by gdb_realpath.  */

extern std::string gdb_realpath_keepfile (const char *filename);

/* Return PATH in absolute form, performing tilde-expansion if necessary.
   PATH cannot be NULL or the empty string.
   This does not resolve symlinks however, use gdb_realpath for that.

   Contrary to "gdb_realpath", this function uses CWD for the path
   expansion.  This may lead to scenarios the current working
   directory is different than CWD.

   If CWD is NULL, this function returns a copy of PATH.  */

extern std::string gdb_abspath (const char *path,
				const char *cwd = current_directory);

/* Overload of gdb_abspath which takes std::string.  */

static inline std::string
gdb_abspath (const std::string &path)
{
  return gdb_abspath (path.c_str ());
}

/* Overload of gdb_abspath which takes gdb::unique_xmalloc_ptr<char>.  */

static inline std::string
gdb_abspath (const gdb::unique_xmalloc_ptr<char> &path)
{
  return gdb_abspath (path.get ());
}

/* If the path in CHILD is a child of the path in PARENT, return a
   pointer to the first component in the CHILD's pathname below the
   PARENT.  Otherwise, return NULL.  */

extern const char *child_path (const char *parent, const char *child);

/* Join elements in PATHS into a single path.

   The first element can be absolute or relative.  Only a single directory
   separator will be placed between elements of PATHS, if one element ends
   with a directory separator, or an element starts with a directory
   separator, then these will be collapsed into a single separator.  */

extern std::string path_join (gdb::array_view<const char *> paths);

/* Same as the above, but accept paths as distinct parameters.  */

template<typename ...Args>
std::string
path_join (Args... paths)
{
  /* It doesn't make sense to join less than two paths.  */
  static_assert (sizeof... (Args) >= 2);

  std::array<const char *, sizeof... (Args)> path_array
    { paths... };

  return path_join (gdb::array_view<const char *> (path_array));
}

/* Return whether PATH contains a directory separator character.  */

extern bool contains_dir_separator (const char *path);

/* Get the usual user cache directory for the current platform.

   On Linux, it follows the XDG Base Directory specification: use
   $XDG_CACHE_HOME/gdb if the XDG_CACHE_HOME environment variable is
   defined, otherwise $HOME/.cache.

   On macOS, it follows the local convention and uses
   ~/Library/Caches/gdb.

  The return value is absolute and tilde-expanded.  Return an empty
  string if neither XDG_CACHE_HOME (on Linux) or HOME are defined.  */

extern std::string get_standard_cache_dir ();

/* Get the usual temporary directory for the current platform.

   On Windows, this is the TMP or TEMP environment variable.

   On the rest, this is the TMPDIR environment variable, if defined, else /tmp.

   Throw an exception on error.  */

extern std::string get_standard_temp_dir ();

/* Get the usual user config directory for the current platform.

   On Linux, it follows the XDG Base Directory specification: use
   $XDG_CONFIG_HOME/gdb if the XDG_CONFIG_HOME environment variable is
   defined, otherwise $HOME/.config.

   On macOS, it follows the local convention and uses
   ~/Library/Preferences/gdb.

  The return value is absolute and tilde-expanded.  Return an empty
  string if neither XDG_CONFIG_HOME (on Linux) or HOME are defined.  */

extern std::string get_standard_config_dir ();

/* Look for FILENAME in the standard configuration directory as returned by
   GET_STANDARD_CONFIG_DIR and return the path to the file.  No check is
   performed that the file actually exists or not.

   If FILENAME begins with a '.' then the path returned will remove the
   leading '.' character, for example passing '.gdbinit' could return the
   path '/home/username/.config/gdb/gdbinit'.  */

extern std::string get_standard_config_filename (const char *filename);

/* Look for a file called NAME in either the standard config directory or
   in the users home directory.  If a suitable file is found then *BUF will
   be filled with the contents of a call to 'stat' on the found file,
   otherwise *BUF is undefined after this call.

   If NAME starts with a '.' character then, when looking in the standard
   config directory the file searched for has the '.' removed.  For
   example, if NAME is '.gdbinit' then on a Linux target GDB might look for
   '~/.config/gdb/gdbinit' and then '~/.gdbinit'.  */

extern std::string find_gdb_home_config_file (const char *name,
					      struct stat *buf);

/* Return the file name of the user's shell.  Normally this comes from
   the SHELL environment variable.  */

extern const char *get_shell ();

/* Make a filename suitable to pass to mkstemp based on F (e.g.
   /tmp/foo -> /tmp/foo-XXXXXX).  */

extern gdb::char_vector make_temp_filename (const std::string &f);

#endif /* GDBSUPPORT_PATHSTUFF_H */