104 lines
3 KiB
C++
104 lines
3 KiB
C++
/* Perform tilde expansion on paths for GDB and gdbserver.
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Copyright (C) 2017-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program 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 3 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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#include <algorithm>
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#include "filenames.h"
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#include "gdb_tilde_expand.h"
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#include <glob.h>
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/* RAII-style class wrapping "glob". */
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class gdb_glob
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{
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public:
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/* Construct a "gdb_glob" object by calling "glob" with the provided
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parameters. This function can throw if "glob" fails. */
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gdb_glob (const char *pattern, int flags,
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int (*errfunc) (const char *epath, int eerrno))
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{
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int ret = glob (pattern, flags, errfunc, &m_glob);
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if (ret != 0)
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{
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if (ret == GLOB_NOMATCH)
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error (_("Could not find a match for '%s'."), pattern);
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else
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error (_("glob could not process pattern '%s'."),
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pattern);
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}
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}
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/* Destroy the object and free M_GLOB. */
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~gdb_glob ()
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{
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globfree (&m_glob);
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}
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/* Return the GL_PATHC component of M_GLOB. */
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int pathc () const
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{
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return m_glob.gl_pathc;
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}
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/* Return the GL_PATHV component of M_GLOB. */
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char **pathv () const
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{
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return m_glob.gl_pathv;
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}
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private:
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/* The actual glob object we're dealing with. */
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glob_t m_glob;
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};
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/* See gdbsupport/gdb_tilde_expand.h. */
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std::string
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gdb_tilde_expand (const char *dir)
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{
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if (dir[0] != '~')
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return std::string (dir);
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/* This function uses glob in order to expand the ~. However, this function
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will fail to expand if the actual dir we are looking for does not exist.
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Given "~/does/not/exist", glob will fail.
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In order to avoid such limitation, we only use glob to expand "~" and keep
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"/does/not/exist" unchanged.
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Similarly, to expand ~gdb/might/not/exist, we only expand "~gdb" using
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glob and leave "/might/not/exist" unchanged. */
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const std::string d (dir);
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/* Look for the first dir separator (if any) and split d around it. */
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const auto first_sep
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= std::find_if (d.cbegin (), d.cend(),
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[] (const char c) -> bool
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{
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return IS_DIR_SEPARATOR (c);
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});
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const std::string to_expand (d.cbegin (), first_sep);
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const std::string remainder (first_sep, d.cend ());
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const gdb_glob glob (to_expand.c_str (), GLOB_TILDE_CHECK, nullptr);
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gdb_assert (glob.pathc () == 1);
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return std::string (glob.pathv ()[0]) + remainder;
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}
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