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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;
}
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