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- /* Perform tilde expansion on paths for GDB and gdbserver.
- Copyright (C) 2017-2022 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/>. */
- #include "common-defs.h"
- #include <algorithm>
- #include "filenames.h"
- #include "gdb_tilde_expand.h"
- #include <glob.h>
- /* RAII-style class wrapping "glob". */
- class gdb_glob
- {
- public:
- /* Construct a "gdb_glob" object by calling "glob" with the provided
- parameters. This function can throw if "glob" fails. */
- gdb_glob (const char *pattern, int flags,
- int (*errfunc) (const char *epath, int eerrno))
- {
- int ret = glob (pattern, flags, errfunc, &m_glob);
- if (ret != 0)
- {
- if (ret == GLOB_NOMATCH)
- error (_("Could not find a match for '%s'."), pattern);
- else
- error (_("glob could not process pattern '%s'."),
- pattern);
- }
- }
- /* Destroy the object and free M_GLOB. */
- ~gdb_glob ()
- {
- globfree (&m_glob);
- }
- /* Return the GL_PATHC component of M_GLOB. */
- int pathc () const
- {
- return m_glob.gl_pathc;
- }
- /* Return the GL_PATHV component of M_GLOB. */
- char **pathv () const
- {
- return m_glob.gl_pathv;
- }
- private:
- /* The actual glob object we're dealing with. */
- glob_t m_glob;
- };
- /* See gdbsupport/gdb_tilde_expand.h. */
- std::string
- gdb_tilde_expand (const char *dir)
- {
- if (dir[0] != '~')
- return std::string (dir);
- /* This function uses glob in order to expand the ~. However, this function
- will fail to expand if the actual dir we are looking for does not exist.
- Given "~/does/not/exist", glob will fail.
- In order to avoid such limitation, we only use glob to expand "~" and keep
- "/does/not/exist" unchanged.
- Similarly, to expand ~gdb/might/not/exist, we only expand "~gdb" using
- glob and leave "/might/not/exist" unchanged. */
- const std::string d (dir);
- /* Look for the first dir separator (if any) and split d around it. */
- const auto first_sep
- = std::find_if (d.cbegin (), d.cend(),
- [] (const char c) -> bool
- {
- return IS_DIR_SEPARATOR (c);
- });
- const std::string to_expand (d.cbegin (), first_sep);
- const std::string remainder (first_sep, d.cend ());
- const gdb_glob glob (to_expand.c_str (), GLOB_TILDE_CHECK, nullptr);
- gdb_assert (glob.pathc () == 1);
- return std::string (glob.pathv ()[0]) + remainder;
- }
- /* See gdbsupport/gdb_tilde_expand.h. */
- gdb::unique_xmalloc_ptr<char>
- gdb_tilde_expand_up (const char *dir)
- {
- const std::string expanded = gdb_tilde_expand (dir);
- return make_unique_xstrdup (expanded.c_str ());
- }
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