291 lines
8.2 KiB
C
291 lines
8.2 KiB
C
/* Path manipulation routines for GDB and gdbserver.
|
|
|
|
Copyright (C) 1986-2019 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 "pathstuff.h"
|
|
#include "host-defs.h"
|
|
#include "filenames.h"
|
|
#include "gdb_tilde_expand.h"
|
|
|
|
#ifdef USE_WIN32API
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
gdb::unique_xmalloc_ptr<char>
|
|
gdb_realpath (const char *filename)
|
|
{
|
|
/* On most hosts, we rely on canonicalize_file_name to compute
|
|
the FILENAME's realpath.
|
|
|
|
But the situation is slightly more complex on Windows, due to some
|
|
versions of GCC which were reported to generate paths where
|
|
backlashes (the directory separator) were doubled. For instance:
|
|
c:\\some\\double\\slashes\\dir
|
|
... instead of ...
|
|
c:\some\double\slashes\dir
|
|
Those double-slashes were getting in the way when comparing paths,
|
|
for instance when trying to insert a breakpoint as follow:
|
|
(gdb) b c:/some/double/slashes/dir/foo.c:4
|
|
No source file named c:/some/double/slashes/dir/foo.c:4.
|
|
(gdb) b c:\some\double\slashes\dir\foo.c:4
|
|
No source file named c:\some\double\slashes\dir\foo.c:4.
|
|
To prevent this from happening, we need this function to always
|
|
strip those extra backslashes. While canonicalize_file_name does
|
|
perform this simplification, it only works when the path is valid.
|
|
Since the simplification would be useful even if the path is not
|
|
valid (one can always set a breakpoint on a file, even if the file
|
|
does not exist locally), we rely instead on GetFullPathName to
|
|
perform the canonicalization. */
|
|
|
|
#if defined (_WIN32)
|
|
{
|
|
char buf[MAX_PATH];
|
|
DWORD len = GetFullPathName (filename, MAX_PATH, buf, NULL);
|
|
|
|
/* The file system is case-insensitive but case-preserving.
|
|
So it is important we do not lowercase the path. Otherwise,
|
|
we might not be able to display the original casing in a given
|
|
path. */
|
|
if (len > 0 && len < MAX_PATH)
|
|
return make_unique_xstrdup (buf);
|
|
}
|
|
#else
|
|
{
|
|
char *rp = canonicalize_file_name (filename);
|
|
|
|
if (rp != NULL)
|
|
return gdb::unique_xmalloc_ptr<char> (rp);
|
|
}
|
|
#endif
|
|
|
|
/* This system is a lost cause, just dup the buffer. */
|
|
return make_unique_xstrdup (filename);
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
gdb::unique_xmalloc_ptr<char>
|
|
gdb_realpath_keepfile (const char *filename)
|
|
{
|
|
const char *base_name = lbasename (filename);
|
|
char *dir_name;
|
|
char *result;
|
|
|
|
/* Extract the basename of filename, and return immediately
|
|
a copy of filename if it does not contain any directory prefix. */
|
|
if (base_name == filename)
|
|
return make_unique_xstrdup (filename);
|
|
|
|
dir_name = (char *) alloca ((size_t) (base_name - filename + 2));
|
|
/* Allocate enough space to store the dir_name + plus one extra
|
|
character sometimes needed under Windows (see below), and
|
|
then the closing \000 character. */
|
|
strncpy (dir_name, filename, base_name - filename);
|
|
dir_name[base_name - filename] = '\000';
|
|
|
|
#ifdef HAVE_DOS_BASED_FILE_SYSTEM
|
|
/* We need to be careful when filename is of the form 'd:foo', which
|
|
is equivalent of d:./foo, which is totally different from d:/foo. */
|
|
if (strlen (dir_name) == 2 && isalpha (dir_name[0]) && dir_name[1] == ':')
|
|
{
|
|
dir_name[2] = '.';
|
|
dir_name[3] = '\000';
|
|
}
|
|
#endif
|
|
|
|
/* Canonicalize the directory prefix, and build the resulting
|
|
filename. If the dirname realpath already contains an ending
|
|
directory separator, avoid doubling it. */
|
|
gdb::unique_xmalloc_ptr<char> path_storage = gdb_realpath (dir_name);
|
|
const char *real_path = path_storage.get ();
|
|
if (IS_DIR_SEPARATOR (real_path[strlen (real_path) - 1]))
|
|
result = concat (real_path, base_name, (char *) NULL);
|
|
else
|
|
result = concat (real_path, SLASH_STRING, base_name, (char *) NULL);
|
|
|
|
return gdb::unique_xmalloc_ptr<char> (result);
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
gdb::unique_xmalloc_ptr<char>
|
|
gdb_abspath (const char *path)
|
|
{
|
|
gdb_assert (path != NULL && path[0] != '\0');
|
|
|
|
if (path[0] == '~')
|
|
return gdb_tilde_expand_up (path);
|
|
|
|
if (IS_ABSOLUTE_PATH (path))
|
|
return make_unique_xstrdup (path);
|
|
|
|
/* Beware the // my son, the Emacs barfs, the botch that catch... */
|
|
return gdb::unique_xmalloc_ptr<char>
|
|
(concat (current_directory,
|
|
IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1])
|
|
? "" : SLASH_STRING,
|
|
path, (char *) NULL));
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
const char *
|
|
child_path (const char *parent, const char *child)
|
|
{
|
|
/* The child path must start with the parent path. */
|
|
size_t parent_len = strlen (parent);
|
|
if (filename_ncmp (parent, child, parent_len) != 0)
|
|
return NULL;
|
|
|
|
/* The parent path must be a directory and the child must contain at
|
|
least one component underneath the parent. */
|
|
const char *child_component;
|
|
if (IS_DIR_SEPARATOR (parent[parent_len - 1]))
|
|
{
|
|
/* The parent path ends in a directory separator, so it is a
|
|
directory. The first child component starts after the common
|
|
prefix. */
|
|
child_component = child + parent_len;
|
|
}
|
|
else
|
|
{
|
|
/* The parent path does not end in a directory separator. The
|
|
first character in the child after the common prefix must be
|
|
a directory separator.
|
|
|
|
Note that CHILD must hold at least parent_len characters for
|
|
filename_ncmp to return zero. If the character at parent_len
|
|
is nul due to CHILD containing the same path as PARENT, the
|
|
IS_DIR_SEPARATOR check will fail here. */
|
|
if (!IS_DIR_SEPARATOR (child[parent_len]))
|
|
return NULL;
|
|
|
|
/* The first child component starts after the separator after the
|
|
common prefix. */
|
|
child_component = child + parent_len + 1;
|
|
}
|
|
|
|
/* The child must contain at least one non-separator character after
|
|
the parent. */
|
|
while (*child_component != '\0')
|
|
{
|
|
if (!IS_DIR_SEPARATOR (*child_component))
|
|
return child_component;
|
|
|
|
child_component++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
bool
|
|
contains_dir_separator (const char *path)
|
|
{
|
|
for (; *path != '\0'; path++)
|
|
{
|
|
if (IS_DIR_SEPARATOR (*path))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
std::string
|
|
get_standard_cache_dir ()
|
|
{
|
|
#ifdef __APPLE__
|
|
#define HOME_CACHE_DIR "Library/Caches"
|
|
#else
|
|
#define HOME_CACHE_DIR ".cache"
|
|
#endif
|
|
|
|
#ifndef __APPLE__
|
|
const char *xdg_cache_home = getenv ("XDG_CACHE_HOME");
|
|
if (xdg_cache_home != NULL)
|
|
{
|
|
/* Make sure the path is absolute and tilde-expanded. */
|
|
gdb::unique_xmalloc_ptr<char> abs (gdb_abspath (xdg_cache_home));
|
|
return string_printf ("%s/gdb", abs.get ());
|
|
}
|
|
#endif
|
|
|
|
const char *home = getenv ("HOME");
|
|
if (home != NULL)
|
|
{
|
|
/* Make sure the path is absolute and tilde-expanded. */
|
|
gdb::unique_xmalloc_ptr<char> abs (gdb_abspath (home));
|
|
return string_printf ("%s/" HOME_CACHE_DIR "/gdb", abs.get ());
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
std::string
|
|
get_standard_temp_dir ()
|
|
{
|
|
#ifdef WIN32
|
|
const char *tmp = getenv ("TMP");
|
|
if (tmp != nullptr)
|
|
return tmp;
|
|
|
|
tmp = getenv ("TEMP");
|
|
if (tmp != nullptr)
|
|
return tmp;
|
|
|
|
error (_("Couldn't find temp dir path, both TMP and TEMP are unset."));
|
|
|
|
#else
|
|
const char *tmp = getenv ("TMPDIR");
|
|
if (tmp != nullptr)
|
|
return tmp;
|
|
|
|
return "/tmp";
|
|
#endif
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
const char *
|
|
get_shell ()
|
|
{
|
|
const char *ret = getenv ("SHELL");
|
|
if (ret == NULL)
|
|
ret = "/bin/sh";
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* See common/pathstuff.h. */
|
|
|
|
gdb::char_vector
|
|
make_temp_filename (const std::string &f)
|
|
{
|
|
gdb::char_vector filename_temp (f.length () + 8);
|
|
strcpy (filename_temp.data (), f.c_str ());
|
|
strcat (filename_temp.data () + f.size (), "-XXXXXX");
|
|
return filename_temp;
|
|
}
|