mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2024-12-25 15:06:14 +01:00
362f92b693
Basically various trivial instances of the following MSVC compiler warning: ``` ../gio/gio-tool-set.c(50): warning C4267: '=': conversion from 'size_t' to 'int', possible loss of data ``` Signed-off-by: Philip Withnall <pwithnall@gnome.org>
3060 lines
85 KiB
C
3060 lines
85 KiB
C
/* gfileutils.c - File utility functions
|
||
*
|
||
* Copyright 2000 Red Hat, Inc.
|
||
*
|
||
* SPDX-License-Identifier: LGPL-2.1-or-later
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU Lesser General Public
|
||
* License as published by the Free Software Foundation; either
|
||
* version 2.1 of the License, or (at your option) any later version.
|
||
*
|
||
* This library 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
|
||
* Lesser General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU Lesser General Public License
|
||
* along with this library; if not, see <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
#include "config.h"
|
||
#include "glibconfig.h"
|
||
|
||
#include <sys/stat.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <stdarg.h>
|
||
#include <string.h>
|
||
#include <errno.h>
|
||
#include <sys/types.h>
|
||
#include <sys/stat.h>
|
||
#include <fcntl.h>
|
||
#include <stdlib.h>
|
||
|
||
#ifdef G_OS_UNIX
|
||
#include <unistd.h>
|
||
#endif
|
||
#ifdef G_OS_WIN32
|
||
#include <windows.h>
|
||
#include <io.h>
|
||
#endif /* G_OS_WIN32 */
|
||
|
||
#ifndef S_ISLNK
|
||
#define S_ISLNK(x) 0
|
||
#endif
|
||
|
||
#ifndef O_BINARY
|
||
#define O_BINARY 0
|
||
#endif
|
||
|
||
#ifndef O_CLOEXEC
|
||
#define O_CLOEXEC 0
|
||
#endif
|
||
|
||
#include "gfileutils.h"
|
||
|
||
#include "gstdio.h"
|
||
#include "gstdioprivate.h"
|
||
#include "glibintl.h"
|
||
|
||
|
||
/**
|
||
* GFileError:
|
||
* @G_FILE_ERROR_EXIST: Operation not permitted; only the owner of
|
||
* the file (or other resource) or processes with special privileges
|
||
* can perform the operation.
|
||
* @G_FILE_ERROR_ISDIR: File is a directory; you cannot open a directory
|
||
* for writing, or create or remove hard links to it.
|
||
* @G_FILE_ERROR_ACCES: Permission denied; the file permissions do not
|
||
* allow the attempted operation.
|
||
* @G_FILE_ERROR_NAMETOOLONG: Filename too long.
|
||
* @G_FILE_ERROR_NOENT: No such file or directory. This is a "file
|
||
* doesn't exist" error for ordinary files that are referenced in
|
||
* contexts where they are expected to already exist.
|
||
* @G_FILE_ERROR_NOTDIR: A file that isn't a directory was specified when
|
||
* a directory is required.
|
||
* @G_FILE_ERROR_NXIO: No such device or address. The system tried to
|
||
* use the device represented by a file you specified, and it
|
||
* couldn't find the device. This can mean that the device file was
|
||
* installed incorrectly, or that the physical device is missing or
|
||
* not correctly attached to the computer.
|
||
* @G_FILE_ERROR_NODEV: The underlying file system of the specified file
|
||
* does not support memory mapping.
|
||
* @G_FILE_ERROR_ROFS: The directory containing the new link can't be
|
||
* modified because it's on a read-only file system.
|
||
* @G_FILE_ERROR_TXTBSY: Text file busy.
|
||
* @G_FILE_ERROR_FAULT: You passed in a pointer to bad memory.
|
||
* (GLib won't reliably return this, don't pass in pointers to bad
|
||
* memory.)
|
||
* @G_FILE_ERROR_LOOP: Too many levels of symbolic links were encountered
|
||
* in looking up a file name. This often indicates a cycle of symbolic
|
||
* links.
|
||
* @G_FILE_ERROR_NOSPC: No space left on device; write operation on a
|
||
* file failed because the disk is full.
|
||
* @G_FILE_ERROR_NOMEM: No memory available. The system cannot allocate
|
||
* more virtual memory because its capacity is full.
|
||
* @G_FILE_ERROR_MFILE: The current process has too many files open and
|
||
* can't open any more. Duplicate descriptors do count toward this
|
||
* limit.
|
||
* @G_FILE_ERROR_NFILE: There are too many distinct file openings in the
|
||
* entire system.
|
||
* @G_FILE_ERROR_BADF: Bad file descriptor; for example, I/O on a
|
||
* descriptor that has been closed or reading from a descriptor open
|
||
* only for writing (or vice versa).
|
||
* @G_FILE_ERROR_INVAL: Invalid argument. This is used to indicate
|
||
* various kinds of problems with passing the wrong argument to a
|
||
* library function.
|
||
* @G_FILE_ERROR_PIPE: Broken pipe; there is no process reading from the
|
||
* other end of a pipe. Every library function that returns this
|
||
* error code also generates a 'SIGPIPE' signal; this signal
|
||
* terminates the program if not handled or blocked. Thus, your
|
||
* program will never actually see this code unless it has handled
|
||
* or blocked 'SIGPIPE'.
|
||
* @G_FILE_ERROR_AGAIN: Resource temporarily unavailable; the call might
|
||
* work if you try again later.
|
||
* @G_FILE_ERROR_INTR: Interrupted function call; an asynchronous signal
|
||
* occurred and prevented completion of the call. When this
|
||
* happens, you should try the call again.
|
||
* @G_FILE_ERROR_IO: Input/output error; usually used for physical read
|
||
* or write errors. i.e. the disk or other physical device hardware
|
||
* is returning errors.
|
||
* @G_FILE_ERROR_PERM: Operation not permitted; only the owner of the
|
||
* file (or other resource) or processes with special privileges can
|
||
* perform the operation.
|
||
* @G_FILE_ERROR_NOSYS: Function not implemented; this indicates that
|
||
* the system is missing some functionality.
|
||
* @G_FILE_ERROR_FAILED: Does not correspond to a UNIX error code; this
|
||
* is the standard "failed for unspecified reason" error code present
|
||
* in all #GError error code enumerations. Returned if no specific
|
||
* code applies.
|
||
*
|
||
* Values corresponding to @errno codes returned from file operations
|
||
* on UNIX. Unlike @errno codes, GFileError values are available on
|
||
* all systems, even Windows. The exact meaning of each code depends
|
||
* on what sort of file operation you were performing; the UNIX
|
||
* documentation gives more details. The following error code descriptions
|
||
* come from the GNU C Library manual, and are under the copyright
|
||
* of that manual.
|
||
*
|
||
* It's not very portable to make detailed assumptions about exactly
|
||
* which errors will be returned from a given operation. Some errors
|
||
* don't occur on some systems, etc., sometimes there are subtle
|
||
* differences in when a system will report a given error, etc.
|
||
*/
|
||
|
||
/**
|
||
* G_FILE_ERROR:
|
||
*
|
||
* Error domain for file operations. Errors in this domain will
|
||
* be from the #GFileError enumeration. See #GError for information
|
||
* on error domains.
|
||
*/
|
||
|
||
/**
|
||
* GFileTest:
|
||
* @G_FILE_TEST_IS_REGULAR: %TRUE if the file is a regular file
|
||
* (not a directory). Note that this test will also return %TRUE
|
||
* if the tested file is a symlink to a regular file.
|
||
* @G_FILE_TEST_IS_SYMLINK: %TRUE if the file is a symlink.
|
||
* @G_FILE_TEST_IS_DIR: %TRUE if the file is a directory.
|
||
* @G_FILE_TEST_IS_EXECUTABLE: %TRUE if the file is executable.
|
||
* @G_FILE_TEST_EXISTS: %TRUE if the file exists. It may or may not
|
||
* be a regular file.
|
||
*
|
||
* A test to perform on a file using g_file_test().
|
||
*/
|
||
|
||
/**
|
||
* g_mkdir_with_parents:
|
||
* @pathname: (type filename): a pathname in the GLib file name encoding
|
||
* @mode: permissions to use for newly created directories
|
||
*
|
||
* Create a directory if it doesn't already exist. Create intermediate
|
||
* parent directories as needed, too.
|
||
*
|
||
* Returns: 0 if the directory already exists, or was successfully
|
||
* created. Returns -1 if an error occurred, with errno set.
|
||
*
|
||
* Since: 2.8
|
||
*/
|
||
int
|
||
g_mkdir_with_parents (const gchar *pathname,
|
||
int mode)
|
||
{
|
||
gchar *fn, *p;
|
||
|
||
if (pathname == NULL || *pathname == '\0')
|
||
{
|
||
errno = EINVAL;
|
||
return -1;
|
||
}
|
||
|
||
/* try to create the full path first */
|
||
if (g_mkdir (pathname, mode) == 0)
|
||
return 0;
|
||
else if (errno == EEXIST)
|
||
{
|
||
if (!g_file_test (pathname, G_FILE_TEST_IS_DIR))
|
||
{
|
||
errno = ENOTDIR;
|
||
return -1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* walk the full path and try creating each element */
|
||
fn = g_strdup (pathname);
|
||
|
||
if (g_path_is_absolute (fn))
|
||
p = (gchar *) g_path_skip_root (fn);
|
||
else
|
||
p = fn;
|
||
|
||
do
|
||
{
|
||
while (*p && !G_IS_DIR_SEPARATOR (*p))
|
||
p++;
|
||
|
||
if (!*p)
|
||
p = NULL;
|
||
else
|
||
*p = '\0';
|
||
|
||
if (!g_file_test (fn, G_FILE_TEST_EXISTS))
|
||
{
|
||
if (g_mkdir (fn, mode) == -1 && errno != EEXIST)
|
||
{
|
||
int errno_save = errno;
|
||
if (errno != ENOENT || !p)
|
||
{
|
||
g_free (fn);
|
||
errno = errno_save;
|
||
return -1;
|
||
}
|
||
}
|
||
}
|
||
else if (!g_file_test (fn, G_FILE_TEST_IS_DIR))
|
||
{
|
||
g_free (fn);
|
||
errno = ENOTDIR;
|
||
return -1;
|
||
}
|
||
if (p)
|
||
{
|
||
*p++ = G_DIR_SEPARATOR;
|
||
while (*p && G_IS_DIR_SEPARATOR (*p))
|
||
p++;
|
||
}
|
||
}
|
||
while (p);
|
||
|
||
g_free (fn);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* g_file_test:
|
||
* @filename: (type filename): a filename to test in the
|
||
* GLib file name encoding
|
||
* @test: bitfield of #GFileTest flags
|
||
*
|
||
* Returns %TRUE if any of the tests in the bitfield @test are
|
||
* %TRUE. For example, `(G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR)`
|
||
* will return %TRUE if the file exists; the check whether it's a
|
||
* directory doesn't matter since the existence test is %TRUE. With
|
||
* the current set of available tests, there's no point passing in
|
||
* more than one test at a time.
|
||
*
|
||
* Apart from %G_FILE_TEST_IS_SYMLINK all tests follow symbolic links,
|
||
* so for a symbolic link to a regular file g_file_test() will return
|
||
* %TRUE for both %G_FILE_TEST_IS_SYMLINK and %G_FILE_TEST_IS_REGULAR.
|
||
*
|
||
* Note, that for a dangling symbolic link g_file_test() will return
|
||
* %TRUE for %G_FILE_TEST_IS_SYMLINK and %FALSE for all other flags.
|
||
*
|
||
* You should never use g_file_test() to test whether it is safe
|
||
* to perform an operation, because there is always the possibility
|
||
* of the condition changing before you actually perform the operation,
|
||
* see [TOCTOU](https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use).
|
||
*
|
||
* For example, you might think you could use %G_FILE_TEST_IS_SYMLINK
|
||
* to know whether it is safe to write to a file without being
|
||
* tricked into writing into a different location. It doesn't work!
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* // DON'T DO THIS
|
||
* if (!g_file_test (filename, G_FILE_TEST_IS_SYMLINK))
|
||
* {
|
||
* fd = g_open (filename, O_WRONLY);
|
||
* // write to fd
|
||
* }
|
||
*
|
||
* // DO THIS INSTEAD
|
||
* fd = g_open (filename, O_WRONLY | O_NOFOLLOW | O_CLOEXEC);
|
||
* if (fd == -1)
|
||
* {
|
||
* // check error
|
||
* if (errno == ELOOP)
|
||
* // file is a symlink and can be ignored
|
||
* else
|
||
* // handle errors as before
|
||
* }
|
||
* else
|
||
* {
|
||
* // write to fd
|
||
* }
|
||
* ]|
|
||
*
|
||
* Another thing to note is that %G_FILE_TEST_EXISTS and
|
||
* %G_FILE_TEST_IS_EXECUTABLE are implemented using the access()
|
||
* system call. This usually doesn't matter, but if your program
|
||
* is setuid or setgid it means that these tests will give you
|
||
* the answer for the real user ID and group ID, rather than the
|
||
* effective user ID and group ID.
|
||
*
|
||
* On Windows, there are no symlinks, so testing for
|
||
* %G_FILE_TEST_IS_SYMLINK will always return %FALSE. Testing for
|
||
* %G_FILE_TEST_IS_EXECUTABLE will just check that the file exists and
|
||
* its name indicates that it is executable, checking for well-known
|
||
* extensions and those listed in the `PATHEXT` environment variable.
|
||
*
|
||
* Returns: whether a test was %TRUE
|
||
**/
|
||
gboolean
|
||
g_file_test (const gchar *filename,
|
||
GFileTest test)
|
||
{
|
||
#ifdef G_OS_WIN32
|
||
DWORD attributes;
|
||
wchar_t *wfilename;
|
||
#endif
|
||
|
||
g_return_val_if_fail (filename != NULL, FALSE);
|
||
|
||
#ifdef G_OS_WIN32
|
||
/* stuff missing in std vc6 api */
|
||
# ifndef INVALID_FILE_ATTRIBUTES
|
||
# define INVALID_FILE_ATTRIBUTES -1
|
||
# endif
|
||
# ifndef FILE_ATTRIBUTE_DEVICE
|
||
# define FILE_ATTRIBUTE_DEVICE 64
|
||
# endif
|
||
wfilename = g_utf8_to_utf16 (filename, -1, NULL, NULL, NULL);
|
||
|
||
if (wfilename == NULL)
|
||
return FALSE;
|
||
|
||
attributes = GetFileAttributesW (wfilename);
|
||
|
||
g_free (wfilename);
|
||
|
||
if (attributes == INVALID_FILE_ATTRIBUTES)
|
||
return FALSE;
|
||
|
||
if (test & G_FILE_TEST_EXISTS)
|
||
return TRUE;
|
||
|
||
if (test & G_FILE_TEST_IS_REGULAR)
|
||
{
|
||
if ((attributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE)) == 0)
|
||
return TRUE;
|
||
}
|
||
|
||
if (test & G_FILE_TEST_IS_DIR)
|
||
{
|
||
if ((attributes & FILE_ATTRIBUTE_DIRECTORY) != 0)
|
||
return TRUE;
|
||
}
|
||
|
||
/* "while" so that we can exit this "loop" with a simple "break" */
|
||
while (test & G_FILE_TEST_IS_EXECUTABLE)
|
||
{
|
||
const gchar *lastdot = strrchr (filename, '.');
|
||
const gchar *pathext = NULL, *p;
|
||
size_t extlen;
|
||
|
||
if (lastdot == NULL)
|
||
break;
|
||
|
||
if (_stricmp (lastdot, ".exe") == 0 ||
|
||
_stricmp (lastdot, ".cmd") == 0 ||
|
||
_stricmp (lastdot, ".bat") == 0 ||
|
||
_stricmp (lastdot, ".com") == 0)
|
||
return TRUE;
|
||
|
||
/* Check if it is one of the types listed in %PATHEXT% */
|
||
|
||
pathext = g_getenv ("PATHEXT");
|
||
if (pathext == NULL)
|
||
break;
|
||
|
||
pathext = g_utf8_casefold (pathext, -1);
|
||
|
||
lastdot = g_utf8_casefold (lastdot, -1);
|
||
extlen = strlen (lastdot);
|
||
|
||
p = pathext;
|
||
while (TRUE)
|
||
{
|
||
const gchar *q = strchr (p, ';');
|
||
if (q == NULL)
|
||
q = p + strlen (p);
|
||
if (extlen == (size_t) (q - p) &&
|
||
memcmp (lastdot, p, extlen) == 0)
|
||
{
|
||
g_free ((gchar *) pathext);
|
||
g_free ((gchar *) lastdot);
|
||
return TRUE;
|
||
}
|
||
if (*q)
|
||
p = q + 1;
|
||
else
|
||
break;
|
||
}
|
||
|
||
g_free ((gchar *) pathext);
|
||
g_free ((gchar *) lastdot);
|
||
break;
|
||
}
|
||
|
||
return FALSE;
|
||
#else
|
||
if ((test & G_FILE_TEST_EXISTS) && (access (filename, F_OK) == 0))
|
||
return TRUE;
|
||
|
||
if ((test & G_FILE_TEST_IS_EXECUTABLE) && (access (filename, X_OK) == 0))
|
||
{
|
||
if (getuid () != 0)
|
||
return TRUE;
|
||
|
||
/* For root, on some POSIX systems, access (filename, X_OK)
|
||
* will succeed even if no executable bits are set on the
|
||
* file. We fall through to a stat test to avoid that.
|
||
*/
|
||
}
|
||
else
|
||
test &= ~G_FILE_TEST_IS_EXECUTABLE;
|
||
|
||
if (test & G_FILE_TEST_IS_SYMLINK)
|
||
{
|
||
struct stat s;
|
||
|
||
if ((lstat (filename, &s) == 0) && S_ISLNK (s.st_mode))
|
||
return TRUE;
|
||
}
|
||
|
||
if (test & (G_FILE_TEST_IS_REGULAR |
|
||
G_FILE_TEST_IS_DIR |
|
||
G_FILE_TEST_IS_EXECUTABLE))
|
||
{
|
||
struct stat s;
|
||
|
||
if (stat (filename, &s) == 0)
|
||
{
|
||
if ((test & G_FILE_TEST_IS_REGULAR) && S_ISREG (s.st_mode))
|
||
return TRUE;
|
||
|
||
if ((test & G_FILE_TEST_IS_DIR) && S_ISDIR (s.st_mode))
|
||
return TRUE;
|
||
|
||
/* The extra test for root when access (file, X_OK) succeeds.
|
||
*/
|
||
if ((test & G_FILE_TEST_IS_EXECUTABLE) &&
|
||
((s.st_mode & S_IXOTH) ||
|
||
(s.st_mode & S_IXUSR) ||
|
||
(s.st_mode & S_IXGRP)))
|
||
return TRUE;
|
||
}
|
||
}
|
||
|
||
return FALSE;
|
||
#endif
|
||
}
|
||
|
||
G_DEFINE_QUARK (g-file-error-quark, g_file_error)
|
||
|
||
/**
|
||
* g_file_error_from_errno:
|
||
* @err_no: an "errno" value
|
||
*
|
||
* Gets a #GFileError constant based on the passed-in @err_no.
|
||
*
|
||
* For example, if you pass in `EEXIST` this function returns
|
||
* %G_FILE_ERROR_EXIST. Unlike `errno` values, you can portably
|
||
* assume that all #GFileError values will exist.
|
||
*
|
||
* Normally a #GFileError value goes into a #GError returned
|
||
* from a function that manipulates files. So you would use
|
||
* g_file_error_from_errno() when constructing a #GError.
|
||
*
|
||
* Returns: #GFileError corresponding to the given @err_no
|
||
**/
|
||
GFileError
|
||
g_file_error_from_errno (gint err_no)
|
||
{
|
||
switch (err_no)
|
||
{
|
||
#ifdef EEXIST
|
||
case EEXIST:
|
||
return G_FILE_ERROR_EXIST;
|
||
#endif
|
||
|
||
#ifdef EISDIR
|
||
case EISDIR:
|
||
return G_FILE_ERROR_ISDIR;
|
||
#endif
|
||
|
||
#ifdef EACCES
|
||
case EACCES:
|
||
return G_FILE_ERROR_ACCES;
|
||
#endif
|
||
|
||
#ifdef ENAMETOOLONG
|
||
case ENAMETOOLONG:
|
||
return G_FILE_ERROR_NAMETOOLONG;
|
||
#endif
|
||
|
||
#ifdef ENOENT
|
||
case ENOENT:
|
||
return G_FILE_ERROR_NOENT;
|
||
#endif
|
||
|
||
#ifdef ENOTDIR
|
||
case ENOTDIR:
|
||
return G_FILE_ERROR_NOTDIR;
|
||
#endif
|
||
|
||
#ifdef ENXIO
|
||
case ENXIO:
|
||
return G_FILE_ERROR_NXIO;
|
||
#endif
|
||
|
||
#ifdef ENODEV
|
||
case ENODEV:
|
||
return G_FILE_ERROR_NODEV;
|
||
#endif
|
||
|
||
#ifdef EROFS
|
||
case EROFS:
|
||
return G_FILE_ERROR_ROFS;
|
||
#endif
|
||
|
||
#ifdef ETXTBSY
|
||
case ETXTBSY:
|
||
return G_FILE_ERROR_TXTBSY;
|
||
#endif
|
||
|
||
#ifdef EFAULT
|
||
case EFAULT:
|
||
return G_FILE_ERROR_FAULT;
|
||
#endif
|
||
|
||
#ifdef ELOOP
|
||
case ELOOP:
|
||
return G_FILE_ERROR_LOOP;
|
||
#endif
|
||
|
||
#ifdef ENOSPC
|
||
case ENOSPC:
|
||
return G_FILE_ERROR_NOSPC;
|
||
#endif
|
||
|
||
#ifdef ENOMEM
|
||
case ENOMEM:
|
||
return G_FILE_ERROR_NOMEM;
|
||
#endif
|
||
|
||
#ifdef EMFILE
|
||
case EMFILE:
|
||
return G_FILE_ERROR_MFILE;
|
||
#endif
|
||
|
||
#ifdef ENFILE
|
||
case ENFILE:
|
||
return G_FILE_ERROR_NFILE;
|
||
#endif
|
||
|
||
#ifdef EBADF
|
||
case EBADF:
|
||
return G_FILE_ERROR_BADF;
|
||
#endif
|
||
|
||
#ifdef EINVAL
|
||
case EINVAL:
|
||
return G_FILE_ERROR_INVAL;
|
||
#endif
|
||
|
||
#ifdef EPIPE
|
||
case EPIPE:
|
||
return G_FILE_ERROR_PIPE;
|
||
#endif
|
||
|
||
#ifdef EAGAIN
|
||
case EAGAIN:
|
||
return G_FILE_ERROR_AGAIN;
|
||
#endif
|
||
|
||
#ifdef EINTR
|
||
case EINTR:
|
||
return G_FILE_ERROR_INTR;
|
||
#endif
|
||
|
||
#ifdef EIO
|
||
case EIO:
|
||
return G_FILE_ERROR_IO;
|
||
#endif
|
||
|
||
#ifdef EPERM
|
||
case EPERM:
|
||
return G_FILE_ERROR_PERM;
|
||
#endif
|
||
|
||
#ifdef ENOSYS
|
||
case ENOSYS:
|
||
return G_FILE_ERROR_NOSYS;
|
||
#endif
|
||
|
||
default:
|
||
return G_FILE_ERROR_FAILED;
|
||
}
|
||
}
|
||
|
||
static char *
|
||
format_error_message (const gchar *filename,
|
||
const gchar *format_string,
|
||
int saved_errno) G_GNUC_FORMAT(2);
|
||
|
||
#pragma GCC diagnostic push
|
||
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
|
||
|
||
static char *
|
||
format_error_message (const gchar *filename,
|
||
const gchar *format_string,
|
||
int saved_errno)
|
||
{
|
||
gchar *display_name;
|
||
gchar *msg;
|
||
|
||
display_name = g_filename_display_name (filename);
|
||
msg = g_strdup_printf (format_string, display_name, g_strerror (saved_errno));
|
||
g_free (display_name);
|
||
|
||
return msg;
|
||
}
|
||
|
||
#pragma GCC diagnostic pop
|
||
|
||
/* format string must have two '%s':
|
||
*
|
||
* - the place for the filename
|
||
* - the place for the strerror
|
||
*/
|
||
static void
|
||
set_file_error (GError **error,
|
||
const gchar *filename,
|
||
const gchar *format_string,
|
||
int saved_errno)
|
||
{
|
||
char *msg = format_error_message (filename, format_string, saved_errno);
|
||
|
||
g_set_error_literal (error, G_FILE_ERROR, g_file_error_from_errno (saved_errno),
|
||
msg);
|
||
g_free (msg);
|
||
}
|
||
|
||
static gboolean
|
||
get_contents_stdio (const gchar *filename,
|
||
FILE *f,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error)
|
||
{
|
||
gchar buf[4096];
|
||
gsize bytes; /* always <= sizeof(buf) */
|
||
gchar *str = NULL;
|
||
gsize total_bytes = 0;
|
||
gsize total_allocated = 0;
|
||
gchar *tmp;
|
||
gchar *display_filename;
|
||
|
||
g_assert (f != NULL);
|
||
|
||
while (!feof (f))
|
||
{
|
||
gint save_errno;
|
||
|
||
bytes = fread (buf, 1, sizeof (buf), f);
|
||
save_errno = errno;
|
||
|
||
if (total_bytes > G_MAXSIZE - bytes)
|
||
goto file_too_large;
|
||
|
||
/* Possibility of overflow eliminated above. */
|
||
while (total_bytes + bytes >= total_allocated)
|
||
{
|
||
if (str)
|
||
{
|
||
if (total_allocated > G_MAXSIZE / 2)
|
||
goto file_too_large;
|
||
total_allocated *= 2;
|
||
}
|
||
else
|
||
{
|
||
total_allocated = MIN (bytes + 1, sizeof (buf));
|
||
}
|
||
|
||
tmp = g_try_realloc (str, total_allocated);
|
||
|
||
if (tmp == NULL)
|
||
{
|
||
char *display_size = g_format_size_full (total_allocated, G_FORMAT_SIZE_LONG_FORMAT);
|
||
display_filename = g_filename_display_name (filename);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_NOMEM,
|
||
/* Translators: the first %s contains the file size
|
||
* (already formatted with units), and the second %s
|
||
* contains the file name */
|
||
_("Could not allocate %s to read file “%s”"),
|
||
display_size,
|
||
display_filename);
|
||
g_free (display_filename);
|
||
g_free (display_size);
|
||
|
||
goto error;
|
||
}
|
||
|
||
str = tmp;
|
||
}
|
||
|
||
if (ferror (f))
|
||
{
|
||
display_filename = g_filename_display_name (filename);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
g_file_error_from_errno (save_errno),
|
||
_("Error reading file “%s”: %s"),
|
||
display_filename,
|
||
g_strerror (save_errno));
|
||
g_free (display_filename);
|
||
|
||
goto error;
|
||
}
|
||
|
||
g_assert (str != NULL);
|
||
memcpy (str + total_bytes, buf, bytes);
|
||
|
||
total_bytes += bytes;
|
||
}
|
||
|
||
fclose (f);
|
||
|
||
if (total_allocated == 0)
|
||
{
|
||
str = g_new (gchar, 1);
|
||
total_bytes = 0;
|
||
}
|
||
|
||
str[total_bytes] = '\0';
|
||
|
||
if (length)
|
||
*length = total_bytes;
|
||
|
||
*contents = str;
|
||
|
||
return TRUE;
|
||
|
||
file_too_large:
|
||
display_filename = g_filename_display_name (filename);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_FAILED,
|
||
_("File “%s” is too large"),
|
||
display_filename);
|
||
g_free (display_filename);
|
||
|
||
error:
|
||
|
||
g_free (str);
|
||
fclose (f);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
#ifndef G_OS_WIN32
|
||
|
||
static gboolean
|
||
get_contents_regfile (const gchar *filename,
|
||
struct stat *stat_buf,
|
||
gint fd,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error)
|
||
{
|
||
gchar *buf;
|
||
gsize bytes_read;
|
||
gsize size;
|
||
gsize alloc_size;
|
||
gchar *display_filename;
|
||
|
||
if ((G_MAXOFFSET >= G_MAXSIZE) && (stat_buf->st_size > (goffset) (G_MAXSIZE - 1)))
|
||
{
|
||
display_filename = g_filename_display_name (filename);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_FAILED,
|
||
_("File “%s” is too large"),
|
||
display_filename);
|
||
g_free (display_filename);
|
||
goto error;
|
||
}
|
||
|
||
size = stat_buf->st_size;
|
||
|
||
alloc_size = size + 1;
|
||
buf = g_try_malloc (alloc_size);
|
||
|
||
if (buf == NULL)
|
||
{
|
||
char *display_size = g_format_size_full (alloc_size, G_FORMAT_SIZE_LONG_FORMAT);
|
||
display_filename = g_filename_display_name (filename);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_NOMEM,
|
||
/* Translators: the first %s contains the file size
|
||
* (already formatted with units), and the second %s
|
||
* contains the file name */
|
||
_("Could not allocate %s to read file “%s”"),
|
||
display_size,
|
||
display_filename);
|
||
g_free (display_filename);
|
||
g_free (display_size);
|
||
goto error;
|
||
}
|
||
|
||
bytes_read = 0;
|
||
while (bytes_read < size)
|
||
{
|
||
gssize rc;
|
||
|
||
rc = read (fd, buf + bytes_read, size - bytes_read);
|
||
|
||
if (rc < 0)
|
||
{
|
||
if (errno != EINTR)
|
||
{
|
||
int save_errno = errno;
|
||
|
||
g_free (buf);
|
||
display_filename = g_filename_display_name (filename);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
g_file_error_from_errno (save_errno),
|
||
_("Failed to read from file “%s”: %s"),
|
||
display_filename,
|
||
g_strerror (save_errno));
|
||
g_free (display_filename);
|
||
goto error;
|
||
}
|
||
}
|
||
else if (rc == 0)
|
||
break;
|
||
else
|
||
bytes_read += rc;
|
||
}
|
||
|
||
buf[bytes_read] = '\0';
|
||
|
||
if (length)
|
||
*length = bytes_read;
|
||
|
||
*contents = buf;
|
||
|
||
close (fd);
|
||
|
||
return TRUE;
|
||
|
||
error:
|
||
|
||
close (fd);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static gboolean
|
||
get_contents_posix (const gchar *filename,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error)
|
||
{
|
||
struct stat stat_buf;
|
||
gint fd;
|
||
|
||
/* O_BINARY useful on Cygwin */
|
||
fd = open (filename, O_RDONLY | O_BINARY | O_CLOEXEC);
|
||
|
||
if (fd < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Failed to open file “%s”: %s"),
|
||
saved_errno);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* I don't think this will ever fail, aside from ENOMEM, but. */
|
||
if (fstat (fd, &stat_buf) < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Failed to get attributes of file “%s”: fstat() failed: %s"),
|
||
saved_errno);
|
||
close (fd);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
if (stat_buf.st_size > 0 && S_ISREG (stat_buf.st_mode))
|
||
{
|
||
gboolean retval = get_contents_regfile (filename,
|
||
&stat_buf,
|
||
fd,
|
||
contents,
|
||
length,
|
||
error);
|
||
|
||
return retval;
|
||
}
|
||
else
|
||
{
|
||
FILE *f;
|
||
gboolean retval;
|
||
|
||
f = fdopen (fd, "r");
|
||
|
||
if (f == NULL)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Failed to open file “%s”: fdopen() failed: %s"),
|
||
saved_errno);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
retval = get_contents_stdio (filename, f, contents, length, error);
|
||
|
||
return retval;
|
||
}
|
||
}
|
||
|
||
#else /* G_OS_WIN32 */
|
||
|
||
static gboolean
|
||
get_contents_win32 (const gchar *filename,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error)
|
||
{
|
||
FILE *f;
|
||
gboolean retval;
|
||
|
||
f = g_fopen (filename, "rb");
|
||
|
||
if (f == NULL)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Failed to open file “%s”: %s"),
|
||
saved_errno);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
retval = get_contents_stdio (filename, f, contents, length, error);
|
||
|
||
return retval;
|
||
}
|
||
|
||
#endif
|
||
|
||
/**
|
||
* g_file_get_contents:
|
||
* @filename: (type filename): name of a file to read contents from, in the GLib file name encoding
|
||
* @contents: (out) (array length=length) (element-type guint8): location to store an allocated string, use g_free() to free
|
||
* the returned string
|
||
* @length: (nullable): location to store length in bytes of the contents, or %NULL
|
||
* @error: return location for a #GError, or %NULL
|
||
*
|
||
* Reads an entire file into allocated memory, with good error
|
||
* checking.
|
||
*
|
||
* If the call was successful, it returns %TRUE and sets @contents to the file
|
||
* contents and @length to the length of the file contents in bytes. The string
|
||
* stored in @contents will be nul-terminated, so for text files you can pass
|
||
* %NULL for the @length argument. If the call was not successful, it returns
|
||
* %FALSE and sets @error. The error domain is %G_FILE_ERROR. Possible error
|
||
* codes are those in the #GFileError enumeration. In the error case,
|
||
* @contents is set to %NULL and @length is set to zero.
|
||
*
|
||
* Returns: %TRUE on success, %FALSE if an error occurred
|
||
**/
|
||
gboolean
|
||
g_file_get_contents (const gchar *filename,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error)
|
||
{
|
||
g_return_val_if_fail (filename != NULL, FALSE);
|
||
g_return_val_if_fail (contents != NULL, FALSE);
|
||
|
||
*contents = NULL;
|
||
if (length)
|
||
*length = 0;
|
||
|
||
#ifdef G_OS_WIN32
|
||
return get_contents_win32 (filename, contents, length, error);
|
||
#else
|
||
return get_contents_posix (filename, contents, length, error);
|
||
#endif
|
||
}
|
||
|
||
static gboolean
|
||
rename_file (const char *old_name,
|
||
const char *new_name,
|
||
gboolean do_fsync,
|
||
GError **err)
|
||
{
|
||
errno = 0;
|
||
if (g_rename (old_name, new_name) == -1)
|
||
{
|
||
int save_errno = errno;
|
||
gchar *display_old_name = g_filename_display_name (old_name);
|
||
gchar *display_new_name = g_filename_display_name (new_name);
|
||
|
||
g_set_error (err,
|
||
G_FILE_ERROR,
|
||
g_file_error_from_errno (save_errno),
|
||
_("Failed to rename file “%s” to “%s”: g_rename() failed: %s"),
|
||
display_old_name,
|
||
display_new_name,
|
||
g_strerror (save_errno));
|
||
|
||
g_free (display_old_name);
|
||
g_free (display_new_name);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/* In order to guarantee that the *new* contents of the file are seen in
|
||
* future, fsync() the directory containing the file. Otherwise if the file
|
||
* system was unmounted cleanly now, it would be undefined whether the old
|
||
* or new contents of the file were visible after recovery.
|
||
*
|
||
* This assumes the @old_name and @new_name are in the same directory. */
|
||
#ifdef HAVE_FSYNC
|
||
if (do_fsync)
|
||
{
|
||
gchar *dir = g_path_get_dirname (new_name);
|
||
int dir_fd = g_open (dir, O_RDONLY | O_CLOEXEC, 0);
|
||
|
||
if (dir_fd >= 0)
|
||
{
|
||
g_fsync (dir_fd);
|
||
g_close (dir_fd, NULL);
|
||
}
|
||
|
||
g_free (dir);
|
||
}
|
||
#endif /* HAVE_FSYNC */
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
fd_should_be_fsynced (int fd,
|
||
const gchar *test_file,
|
||
GFileSetContentsFlags flags)
|
||
{
|
||
#ifdef HAVE_FSYNC
|
||
struct stat statbuf;
|
||
|
||
/* If the final destination exists and is > 0 bytes, we want to sync the
|
||
* newly written file to ensure the data is on disk when we rename over
|
||
* the destination. Otherwise if we get a system crash we can lose both
|
||
* the new and the old file on some filesystems. (I.E. those that don't
|
||
* guarantee the data is written to the disk before the metadata.)
|
||
*
|
||
* There is no difference (in file system terms) if the old file doesn’t
|
||
* already exist, apart from the fact that if the system crashes and the new
|
||
* data hasn’t been fsync()ed, there is only one bit of old data to lose (that
|
||
* the file didn’t exist in the first place). In some situations, such as
|
||
* trashing files, the old file never exists, so it seems reasonable to avoid
|
||
* the fsync(). This is not a widely applicable optimisation though.
|
||
*/
|
||
if ((flags & (G_FILE_SET_CONTENTS_CONSISTENT | G_FILE_SET_CONTENTS_DURABLE)) &&
|
||
(flags & G_FILE_SET_CONTENTS_ONLY_EXISTING))
|
||
{
|
||
errno = 0;
|
||
if (g_lstat (test_file, &statbuf) == 0)
|
||
return (statbuf.st_size > 0);
|
||
else if (errno == ENOENT)
|
||
return FALSE;
|
||
else
|
||
return TRUE; /* lstat() failed; be cautious */
|
||
}
|
||
else
|
||
{
|
||
return (flags & (G_FILE_SET_CONTENTS_CONSISTENT | G_FILE_SET_CONTENTS_DURABLE));
|
||
}
|
||
#else /* if !HAVE_FSYNC */
|
||
return FALSE;
|
||
#endif /* !HAVE_FSYNC */
|
||
}
|
||
|
||
static gboolean
|
||
truncate_file (int fd,
|
||
off_t length,
|
||
const char *dest_file,
|
||
GError **error)
|
||
{
|
||
while (
|
||
#ifdef G_OS_WIN32
|
||
g_win32_ftruncate (fd, length) < 0
|
||
#else
|
||
ftruncate (fd, length) < 0
|
||
#endif
|
||
)
|
||
{
|
||
int saved_errno = errno;
|
||
|
||
if (saved_errno == EINTR)
|
||
continue;
|
||
|
||
if (error != NULL)
|
||
set_file_error (error,
|
||
dest_file,
|
||
_("Failed to write file “%s”: ftruncate() failed: %s"),
|
||
saved_errno);
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* closes @fd once it’s finished (on success or error) */
|
||
static gboolean
|
||
write_to_file (const gchar *contents,
|
||
gsize length,
|
||
int fd,
|
||
const gchar *dest_file,
|
||
gboolean do_fsync,
|
||
GError **err)
|
||
{
|
||
#ifdef HAVE_FALLOCATE
|
||
if (length > 0)
|
||
{
|
||
/* We do this on a 'best effort' basis... It may not be supported
|
||
* on the underlying filesystem.
|
||
*/
|
||
(void) fallocate (fd, 0, 0, length);
|
||
}
|
||
#endif
|
||
while (length > 0)
|
||
{
|
||
gssize s;
|
||
|
||
#ifdef G_OS_WIN32
|
||
/* 'write' on windows uses int types, so limit count to G_MAXINT */
|
||
s = write (fd, contents, MIN (length, (gsize) G_MAXINT));
|
||
#else
|
||
/* Limit count to G_MAXSSIZE to fit into the return value. */
|
||
s = write (fd, contents, MIN (length, (gsize) G_MAXSSIZE));
|
||
#endif
|
||
if (s < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
if (saved_errno == EINTR)
|
||
continue;
|
||
|
||
if (err)
|
||
set_file_error (err,
|
||
dest_file, _("Failed to write file “%s”: write() failed: %s"),
|
||
saved_errno);
|
||
close (fd);
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
g_assert ((gsize) s <= length);
|
||
|
||
contents += s;
|
||
length -= s;
|
||
}
|
||
|
||
|
||
#ifdef HAVE_FSYNC
|
||
errno = 0;
|
||
if (do_fsync && g_fsync (fd) != 0)
|
||
{
|
||
int saved_errno = errno;
|
||
if (err)
|
||
set_file_error (err,
|
||
dest_file, _("Failed to write file “%s”: fsync() failed: %s"),
|
||
saved_errno);
|
||
close (fd);
|
||
|
||
return FALSE;
|
||
}
|
||
#endif
|
||
|
||
errno = 0;
|
||
if (!g_close (fd, err))
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/**
|
||
* g_file_set_contents:
|
||
* @filename: (type filename): name of a file to write @contents to, in the GLib file name
|
||
* encoding
|
||
* @contents: (array length=length) (element-type guint8): string to write to the file
|
||
* @length: length of @contents, or -1 if @contents is a nul-terminated string
|
||
* @error: return location for a #GError, or %NULL
|
||
*
|
||
* Writes all of @contents to a file named @filename. This is a convenience
|
||
* wrapper around calling g_file_set_contents_full() with `flags` set to
|
||
* `G_FILE_SET_CONTENTS_CONSISTENT | G_FILE_SET_CONTENTS_ONLY_EXISTING` and
|
||
* `mode` set to `0666`.
|
||
*
|
||
* Returns: %TRUE on success, %FALSE if an error occurred
|
||
*
|
||
* Since: 2.8
|
||
*/
|
||
gboolean
|
||
g_file_set_contents (const gchar *filename,
|
||
const gchar *contents,
|
||
gssize length,
|
||
GError **error)
|
||
{
|
||
return g_file_set_contents_full (filename, contents, length,
|
||
G_FILE_SET_CONTENTS_CONSISTENT |
|
||
G_FILE_SET_CONTENTS_ONLY_EXISTING,
|
||
0666, error);
|
||
}
|
||
|
||
/**
|
||
* g_file_set_contents_full:
|
||
* @filename: (type filename): name of a file to write @contents to, in the GLib file name
|
||
* encoding
|
||
* @contents: (array length=length) (element-type guint8): string to write to the file
|
||
* @length: length of @contents, or -1 if @contents is a nul-terminated string
|
||
* @flags: flags controlling the safety vs speed of the operation
|
||
* @mode: file mode, as passed to `open()`; typically this will be `0666`
|
||
* @error: return location for a #GError, or %NULL
|
||
*
|
||
* Writes all of @contents to a file named @filename, with good error checking.
|
||
* If a file called @filename already exists it will be overwritten.
|
||
*
|
||
* @flags control the properties of the write operation: whether it’s atomic,
|
||
* and what the tradeoff is between returning quickly or being resilient to
|
||
* system crashes.
|
||
*
|
||
* As this function performs file I/O, it is recommended to not call it anywhere
|
||
* where blocking would cause problems, such as in the main loop of a graphical
|
||
* application. In particular, if @flags has any value other than
|
||
* %G_FILE_SET_CONTENTS_NONE then this function may call `fsync()`.
|
||
*
|
||
* If %G_FILE_SET_CONTENTS_CONSISTENT is set in @flags, the operation is atomic
|
||
* in the sense that it is first written to a temporary file which is then
|
||
* renamed to the final name.
|
||
*
|
||
* Notes:
|
||
*
|
||
* - On UNIX, if @filename already exists hard links to @filename will break.
|
||
* Also since the file is recreated, existing permissions, access control
|
||
* lists, metadata etc. may be lost. If @filename is a symbolic link,
|
||
* the link itself will be replaced, not the linked file.
|
||
*
|
||
* - On UNIX, if @filename already exists and is non-empty, and if the system
|
||
* supports it (via a journalling filesystem or equivalent), and if
|
||
* %G_FILE_SET_CONTENTS_CONSISTENT is set in @flags, the `fsync()` call (or
|
||
* equivalent) will be used to ensure atomic replacement: @filename
|
||
* will contain either its old contents or @contents, even in the face of
|
||
* system power loss, the disk being unsafely removed, etc.
|
||
*
|
||
* - On UNIX, if @filename does not already exist or is empty, there is a
|
||
* possibility that system power loss etc. after calling this function will
|
||
* leave @filename empty or full of NUL bytes, depending on the underlying
|
||
* filesystem, unless %G_FILE_SET_CONTENTS_DURABLE and
|
||
* %G_FILE_SET_CONTENTS_CONSISTENT are set in @flags.
|
||
*
|
||
* - On Windows renaming a file will not remove an existing file with the
|
||
* new name, so on Windows there is a race condition between the existing
|
||
* file being removed and the temporary file being renamed.
|
||
*
|
||
* - On Windows there is no way to remove a file that is open to some
|
||
* process, or mapped into memory. Thus, this function will fail if
|
||
* @filename already exists and is open.
|
||
*
|
||
* If the call was successful, it returns %TRUE. If the call was not successful,
|
||
* it returns %FALSE and sets @error. The error domain is %G_FILE_ERROR.
|
||
* Possible error codes are those in the #GFileError enumeration.
|
||
*
|
||
* Note that the name for the temporary file is constructed by appending up
|
||
* to 7 characters to @filename.
|
||
*
|
||
* If the file didn’t exist before and is created, it will be given the
|
||
* permissions from @mode. Otherwise, the permissions of the existing file may
|
||
* be changed to @mode depending on @flags, or they may remain unchanged.
|
||
*
|
||
* Returns: %TRUE on success, %FALSE if an error occurred
|
||
*
|
||
* Since: 2.66
|
||
*/
|
||
gboolean
|
||
g_file_set_contents_full (const gchar *filename,
|
||
const gchar *contents,
|
||
gssize length,
|
||
GFileSetContentsFlags flags,
|
||
int mode,
|
||
GError **error)
|
||
{
|
||
g_return_val_if_fail (filename != NULL, FALSE);
|
||
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
|
||
g_return_val_if_fail (contents != NULL || length == 0, FALSE);
|
||
g_return_val_if_fail (length >= -1, FALSE);
|
||
|
||
/* @flags are handled as follows:
|
||
* - %G_FILE_SET_CONTENTS_NONE: write directly to @filename, no fsync()s
|
||
* - %G_FILE_SET_CONTENTS_CONSISTENT: write to temp file, fsync() it, rename()
|
||
* - %G_FILE_SET_CONTENTS_CONSISTENT | ONLY_EXISTING: as above, but skip the
|
||
* fsync() if @filename doesn’t exist or is empty
|
||
* - %G_FILE_SET_CONTENTS_DURABLE: write directly to @filename, fsync() it
|
||
* - %G_FILE_SET_CONTENTS_DURABLE | ONLY_EXISTING: as above, but skip the
|
||
* fsync() if @filename doesn’t exist or is empty
|
||
* - %G_FILE_SET_CONTENTS_CONSISTENT | DURABLE: write to temp file, fsync()
|
||
* it, rename(), fsync() containing directory
|
||
* - %G_FILE_SET_CONTENTS_CONSISTENT | DURABLE | ONLY_EXISTING: as above, but
|
||
* skip both fsync()s if @filename doesn’t exist or is empty
|
||
*/
|
||
|
||
if (length < 0)
|
||
length = strlen (contents);
|
||
|
||
if (flags & G_FILE_SET_CONTENTS_CONSISTENT)
|
||
{
|
||
gchar *tmp_filename = NULL;
|
||
GError *rename_error = NULL;
|
||
gboolean retval;
|
||
int fd;
|
||
gboolean do_fsync;
|
||
|
||
tmp_filename = g_strdup_printf ("%s.XXXXXX", filename);
|
||
|
||
errno = 0;
|
||
fd = g_mkstemp_full (tmp_filename, O_RDWR | O_BINARY | O_CLOEXEC, mode);
|
||
|
||
if (fd == -1)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
tmp_filename, _("Failed to create file “%s”: %s"),
|
||
saved_errno);
|
||
retval = FALSE;
|
||
goto consistent_out;
|
||
}
|
||
|
||
do_fsync = fd_should_be_fsynced (fd, filename, flags);
|
||
if (!write_to_file (contents, length, g_steal_fd (&fd), tmp_filename, do_fsync, error))
|
||
{
|
||
g_unlink (tmp_filename);
|
||
retval = FALSE;
|
||
goto consistent_out;
|
||
}
|
||
|
||
if (!rename_file (tmp_filename, filename, do_fsync, &rename_error))
|
||
{
|
||
#ifndef G_OS_WIN32
|
||
|
||
g_unlink (tmp_filename);
|
||
g_propagate_error (error, rename_error);
|
||
retval = FALSE;
|
||
goto consistent_out;
|
||
|
||
#else /* G_OS_WIN32 */
|
||
|
||
/* Renaming failed, but on Windows this may just mean
|
||
* the file already exists. So if the target file
|
||
* exists, try deleting it and do the rename again.
|
||
*/
|
||
if (!g_file_test (filename, G_FILE_TEST_EXISTS))
|
||
{
|
||
g_unlink (tmp_filename);
|
||
g_propagate_error (error, rename_error);
|
||
retval = FALSE;
|
||
goto consistent_out;
|
||
}
|
||
|
||
g_error_free (rename_error);
|
||
|
||
if (g_unlink (filename) == -1)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Existing file “%s” could not be removed: g_unlink() failed: %s"),
|
||
saved_errno);
|
||
g_unlink (tmp_filename);
|
||
retval = FALSE;
|
||
goto consistent_out;
|
||
}
|
||
|
||
if (!rename_file (tmp_filename, filename, flags, error))
|
||
{
|
||
g_unlink (tmp_filename);
|
||
retval = FALSE;
|
||
goto consistent_out;
|
||
}
|
||
|
||
#endif /* G_OS_WIN32 */
|
||
}
|
||
|
||
retval = TRUE;
|
||
|
||
consistent_out:
|
||
g_free (tmp_filename);
|
||
return retval;
|
||
}
|
||
else
|
||
{
|
||
int direct_fd;
|
||
int open_flags;
|
||
gboolean do_fsync;
|
||
|
||
open_flags = O_RDWR | O_BINARY | O_CREAT | O_CLOEXEC;
|
||
#ifdef O_NOFOLLOW
|
||
/* Windows doesn’t have symlinks, so O_NOFOLLOW is unnecessary there. */
|
||
open_flags |= O_NOFOLLOW;
|
||
#endif
|
||
|
||
errno = 0;
|
||
direct_fd = g_open (filename, open_flags, mode);
|
||
|
||
if (direct_fd < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
|
||
#ifdef O_NOFOLLOW
|
||
/* ELOOP indicates that @filename is a symlink, since we used
|
||
* O_NOFOLLOW (alternately it could indicate that @filename contains
|
||
* looping or too many symlinks). In either case, try again on the
|
||
* %G_FILE_SET_CONTENTS_CONSISTENT code path.
|
||
*
|
||
* FreeBSD uses EMLINK instead of ELOOP
|
||
* (https://www.freebsd.org/cgi/man.cgi?query=open&sektion=2#STANDARDS),
|
||
* and NetBSD uses EFTYPE
|
||
* (https://netbsd.gw.com/cgi-bin/man-cgi?open+2+NetBSD-current). */
|
||
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
|
||
if (saved_errno == EMLINK)
|
||
#elif defined(__NetBSD__)
|
||
if (saved_errno == EFTYPE)
|
||
#else
|
||
if (saved_errno == ELOOP)
|
||
#endif
|
||
return g_file_set_contents_full (filename, contents, length,
|
||
flags | G_FILE_SET_CONTENTS_CONSISTENT,
|
||
mode, error);
|
||
#endif /* O_NOFOLLOW */
|
||
|
||
if (error)
|
||
set_file_error (error,
|
||
filename, _("Failed to open file “%s”: %s"),
|
||
saved_errno);
|
||
return FALSE;
|
||
}
|
||
|
||
do_fsync = fd_should_be_fsynced (direct_fd, filename, flags);
|
||
if (!truncate_file (direct_fd, 0, filename, error))
|
||
return FALSE;
|
||
if (!write_to_file (contents, length, g_steal_fd (&direct_fd), filename,
|
||
do_fsync, error))
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/*
|
||
* get_tmp_file based on the mkstemp implementation from the GNU C library.
|
||
* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
|
||
*/
|
||
typedef gint (*GTmpFileCallback) (const gchar *, gint, gint);
|
||
|
||
static gint
|
||
get_tmp_file (gchar *tmpl,
|
||
GTmpFileCallback f,
|
||
int flags,
|
||
int mode)
|
||
{
|
||
char *XXXXXX;
|
||
int count, fd;
|
||
static const char letters[] =
|
||
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
|
||
static const int NLETTERS = sizeof (letters) - 1;
|
||
gint64 value;
|
||
gint64 now_us;
|
||
static int counter = 0;
|
||
|
||
g_return_val_if_fail (tmpl != NULL, -1);
|
||
|
||
/* find the last occurrence of "XXXXXX" */
|
||
XXXXXX = g_strrstr (tmpl, "XXXXXX");
|
||
|
||
if (!XXXXXX || strncmp (XXXXXX, "XXXXXX", 6))
|
||
{
|
||
errno = EINVAL;
|
||
return -1;
|
||
}
|
||
|
||
/* Get some more or less random data. */
|
||
now_us = g_get_real_time ();
|
||
value = ((now_us % G_USEC_PER_SEC) ^ (now_us / G_USEC_PER_SEC)) + counter++;
|
||
|
||
for (count = 0; count < 100; value += 7777, ++count)
|
||
{
|
||
gint64 v = value;
|
||
|
||
/* Fill in the random bits. */
|
||
XXXXXX[0] = letters[v % NLETTERS];
|
||
v /= NLETTERS;
|
||
XXXXXX[1] = letters[v % NLETTERS];
|
||
v /= NLETTERS;
|
||
XXXXXX[2] = letters[v % NLETTERS];
|
||
v /= NLETTERS;
|
||
XXXXXX[3] = letters[v % NLETTERS];
|
||
v /= NLETTERS;
|
||
XXXXXX[4] = letters[v % NLETTERS];
|
||
v /= NLETTERS;
|
||
XXXXXX[5] = letters[v % NLETTERS];
|
||
|
||
fd = f (tmpl, flags, mode);
|
||
|
||
if (fd >= 0)
|
||
return fd;
|
||
else if (errno != EEXIST)
|
||
/* Any other error will apply also to other names we might
|
||
* try, and there are 2^32 or so of them, so give up now.
|
||
*/
|
||
return -1;
|
||
}
|
||
|
||
/* We got out of the loop because we ran out of combinations to try. */
|
||
errno = EEXIST;
|
||
return -1;
|
||
}
|
||
|
||
/* Some GTmpFileCallback implementations.
|
||
*
|
||
* Note: we cannot use open() or g_open() directly because even though
|
||
* they appear compatible, they may be vararg functions and calling
|
||
* varargs functions through a non-varargs type is undefined.
|
||
*/
|
||
static gint
|
||
wrap_g_mkdir (const gchar *filename,
|
||
int flags G_GNUC_UNUSED,
|
||
int mode)
|
||
{
|
||
/* tmpl is in UTF-8 on Windows, thus use g_mkdir() */
|
||
return g_mkdir (filename, mode);
|
||
}
|
||
|
||
static gint
|
||
wrap_g_open (const gchar *filename,
|
||
int flags,
|
||
int mode)
|
||
{
|
||
return g_open (filename, flags, mode);
|
||
}
|
||
|
||
/**
|
||
* g_mkdtemp_full: (skip)
|
||
* @tmpl: (type filename): template directory name
|
||
* @mode: permissions to create the temporary directory with
|
||
*
|
||
* Creates a temporary directory. See the mkdtemp() documentation
|
||
* on most UNIX-like systems.
|
||
*
|
||
* The parameter is a string that should follow the rules for
|
||
* mkdtemp() templates, i.e. contain the string "XXXXXX".
|
||
* g_mkdtemp_full() is slightly more flexible than mkdtemp() in that the
|
||
* sequence does not have to occur at the very end of the template
|
||
* and you can pass a @mode. The X string will be modified to form
|
||
* the name of a directory that didn't exist. The string should be
|
||
* in the GLib file name encoding. Most importantly, on Windows it
|
||
* should be in UTF-8.
|
||
*
|
||
* If you are going to be creating a temporary directory inside the
|
||
* directory returned by g_get_tmp_dir(), you might want to use
|
||
* g_dir_make_tmp() instead.
|
||
*
|
||
* Returns: (nullable) (type filename): A pointer to @tmpl, which has been
|
||
* modified to hold the directory name. In case of errors, %NULL is
|
||
* returned, and %errno will be set.
|
||
*
|
||
* Since: 2.30
|
||
*/
|
||
gchar *
|
||
g_mkdtemp_full (gchar *tmpl,
|
||
gint mode)
|
||
{
|
||
if (get_tmp_file (tmpl, wrap_g_mkdir, 0, mode) == -1)
|
||
return NULL;
|
||
else
|
||
return tmpl;
|
||
}
|
||
|
||
/**
|
||
* g_mkdtemp: (skip)
|
||
* @tmpl: (type filename): template directory name
|
||
*
|
||
* Creates a temporary directory. See the mkdtemp() documentation
|
||
* on most UNIX-like systems.
|
||
*
|
||
* The parameter is a string that should follow the rules for
|
||
* mkdtemp() templates, i.e. contain the string "XXXXXX".
|
||
* g_mkdtemp() is slightly more flexible than mkdtemp() in that the
|
||
* sequence does not have to occur at the very end of the template.
|
||
* The X string will be modified to form the name of a directory that
|
||
* didn't exist.
|
||
* The string should be in the GLib file name encoding. Most importantly,
|
||
* on Windows it should be in UTF-8.
|
||
*
|
||
* If you are going to be creating a temporary directory inside the
|
||
* directory returned by g_get_tmp_dir(), you might want to use
|
||
* g_dir_make_tmp() instead.
|
||
*
|
||
* Returns: (nullable) (type filename): A pointer to @tmpl, which has been
|
||
* modified to hold the directory name. In case of errors, %NULL is
|
||
* returned and %errno will be set.
|
||
*
|
||
* Since: 2.30
|
||
*/
|
||
gchar *
|
||
g_mkdtemp (gchar *tmpl)
|
||
{
|
||
return g_mkdtemp_full (tmpl, 0700);
|
||
}
|
||
|
||
/**
|
||
* g_mkstemp_full: (skip)
|
||
* @tmpl: (type filename): template filename
|
||
* @flags: flags to pass to an open() call in addition to O_EXCL
|
||
* and O_CREAT, which are passed automatically
|
||
* @mode: permissions to create the temporary file with
|
||
*
|
||
* Opens a temporary file. See the mkstemp() documentation
|
||
* on most UNIX-like systems.
|
||
*
|
||
* The parameter is a string that should follow the rules for
|
||
* mkstemp() templates, i.e. contain the string "XXXXXX".
|
||
* g_mkstemp_full() is slightly more flexible than mkstemp()
|
||
* in that the sequence does not have to occur at the very end of the
|
||
* template and you can pass a @mode and additional @flags. The X
|
||
* string will be modified to form the name of a file that didn't exist.
|
||
* The string should be in the GLib file name encoding. Most importantly,
|
||
* on Windows it should be in UTF-8.
|
||
*
|
||
* Returns: A file handle (as from open()) to the file
|
||
* opened for reading and writing. The file handle should be
|
||
* closed with close(). In case of errors, -1 is returned
|
||
* and %errno will be set.
|
||
*
|
||
* Since: 2.22
|
||
*/
|
||
gint
|
||
g_mkstemp_full (gchar *tmpl,
|
||
gint flags,
|
||
gint mode)
|
||
{
|
||
/* tmpl is in UTF-8 on Windows, thus use g_open() */
|
||
return get_tmp_file (tmpl, wrap_g_open,
|
||
flags | O_CREAT | O_EXCL, mode);
|
||
}
|
||
|
||
/**
|
||
* g_mkstemp: (skip)
|
||
* @tmpl: (type filename): template filename
|
||
*
|
||
* Opens a temporary file. See the mkstemp() documentation
|
||
* on most UNIX-like systems.
|
||
*
|
||
* The parameter is a string that should follow the rules for
|
||
* mkstemp() templates, i.e. contain the string "XXXXXX".
|
||
* g_mkstemp() is slightly more flexible than mkstemp() in that the
|
||
* sequence does not have to occur at the very end of the template.
|
||
* The X string will be modified to form the name of a file that
|
||
* didn't exist. The string should be in the GLib file name encoding.
|
||
* Most importantly, on Windows it should be in UTF-8.
|
||
*
|
||
* Returns: A file handle (as from open()) to the file
|
||
* opened for reading and writing. The file is opened in binary
|
||
* mode on platforms where there is a difference. The file handle
|
||
* should be closed with close(). In case of errors, -1 is
|
||
* returned and %errno will be set.
|
||
*/
|
||
gint
|
||
g_mkstemp (gchar *tmpl)
|
||
{
|
||
return g_mkstemp_full (tmpl, O_RDWR | O_BINARY | O_CLOEXEC, 0600);
|
||
}
|
||
|
||
static gint
|
||
g_get_tmp_name (const gchar *tmpl,
|
||
gchar **name_used,
|
||
GTmpFileCallback f,
|
||
gint flags,
|
||
gint mode,
|
||
GError **error)
|
||
{
|
||
int retval;
|
||
const char *tmpdir;
|
||
const char *sep;
|
||
char *fulltemplate;
|
||
const char *slash;
|
||
|
||
if (tmpl == NULL)
|
||
tmpl = ".XXXXXX";
|
||
|
||
if ((slash = strchr (tmpl, G_DIR_SEPARATOR)) != NULL
|
||
#ifdef G_OS_WIN32
|
||
|| (strchr (tmpl, '/') != NULL && (slash = "/"))
|
||
#endif
|
||
)
|
||
{
|
||
gchar *display_tmpl = g_filename_display_name (tmpl);
|
||
char c[2];
|
||
c[0] = *slash;
|
||
c[1] = '\0';
|
||
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_FAILED,
|
||
_("Template “%s” invalid, should not contain a “%s”"),
|
||
display_tmpl, c);
|
||
g_free (display_tmpl);
|
||
|
||
return -1;
|
||
}
|
||
|
||
if (strstr (tmpl, "XXXXXX") == NULL)
|
||
{
|
||
gchar *display_tmpl = g_filename_display_name (tmpl);
|
||
g_set_error (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_FAILED,
|
||
_("Template “%s” doesn’t contain XXXXXX"),
|
||
display_tmpl);
|
||
g_free (display_tmpl);
|
||
return -1;
|
||
}
|
||
|
||
tmpdir = g_get_tmp_dir ();
|
||
|
||
if (G_IS_DIR_SEPARATOR (tmpdir [strlen (tmpdir) - 1]))
|
||
sep = "";
|
||
else
|
||
sep = G_DIR_SEPARATOR_S;
|
||
|
||
fulltemplate = g_strconcat (tmpdir, sep, tmpl, NULL);
|
||
|
||
retval = get_tmp_file (fulltemplate, f, flags, mode);
|
||
if (retval == -1)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
fulltemplate,
|
||
_("Failed to create file “%s”: %s"),
|
||
saved_errno);
|
||
g_free (fulltemplate);
|
||
return -1;
|
||
}
|
||
|
||
*name_used = fulltemplate;
|
||
|
||
return retval;
|
||
}
|
||
|
||
/**
|
||
* g_file_open_tmp:
|
||
* @tmpl: (type filename) (nullable): Template for file name, as in
|
||
* g_mkstemp(), basename only, or %NULL for a default template
|
||
* @name_used: (out) (type filename): location to store actual name used,
|
||
* or %NULL
|
||
* @error: return location for a #GError
|
||
*
|
||
* Opens a file for writing in the preferred directory for temporary
|
||
* files (as returned by g_get_tmp_dir()).
|
||
*
|
||
* @tmpl should be a string in the GLib file name encoding containing
|
||
* a sequence of six 'X' characters, as the parameter to g_mkstemp().
|
||
* However, unlike these functions, the template should only be a
|
||
* basename, no directory components are allowed. If template is
|
||
* %NULL, a default template is used.
|
||
*
|
||
* Note that in contrast to g_mkstemp() (and mkstemp()) @tmpl is not
|
||
* modified, and might thus be a read-only literal string.
|
||
*
|
||
* Upon success, and if @name_used is non-%NULL, the actual name used
|
||
* is returned in @name_used. This string should be freed with g_free()
|
||
* when not needed any longer. The returned name is in the GLib file
|
||
* name encoding.
|
||
*
|
||
* Returns: A file handle (as from open()) to the file opened for
|
||
* reading and writing. The file is opened in binary mode on platforms
|
||
* where there is a difference. The file handle should be closed with
|
||
* close(). In case of errors, -1 is returned and @error will be set.
|
||
*/
|
||
gint
|
||
g_file_open_tmp (const gchar *tmpl,
|
||
gchar **name_used,
|
||
GError **error)
|
||
{
|
||
gchar *fulltemplate;
|
||
gint result;
|
||
|
||
g_return_val_if_fail (error == NULL || *error == NULL, -1);
|
||
|
||
result = g_get_tmp_name (tmpl, &fulltemplate,
|
||
wrap_g_open,
|
||
O_CREAT | O_EXCL | O_RDWR | O_BINARY | O_CLOEXEC,
|
||
0600,
|
||
error);
|
||
if (result != -1)
|
||
{
|
||
if (name_used)
|
||
*name_used = fulltemplate;
|
||
else
|
||
g_free (fulltemplate);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/**
|
||
* g_dir_make_tmp:
|
||
* @tmpl: (type filename) (nullable): Template for directory name,
|
||
* as in g_mkdtemp(), basename only, or %NULL for a default template
|
||
* @error: return location for a #GError
|
||
*
|
||
* Creates a subdirectory in the preferred directory for temporary
|
||
* files (as returned by g_get_tmp_dir()).
|
||
*
|
||
* @tmpl should be a string in the GLib file name encoding containing
|
||
* a sequence of six 'X' characters, as the parameter to g_mkstemp().
|
||
* However, unlike these functions, the template should only be a
|
||
* basename, no directory components are allowed. If template is
|
||
* %NULL, a default template is used.
|
||
*
|
||
* Note that in contrast to g_mkdtemp() (and mkdtemp()) @tmpl is not
|
||
* modified, and might thus be a read-only literal string.
|
||
*
|
||
* Returns: (type filename) (transfer full): The actual name used. This string
|
||
* should be freed with g_free() when not needed any longer and is
|
||
* is in the GLib file name encoding. In case of errors, %NULL is
|
||
* returned and @error will be set.
|
||
*
|
||
* Since: 2.30
|
||
*/
|
||
gchar *
|
||
g_dir_make_tmp (const gchar *tmpl,
|
||
GError **error)
|
||
{
|
||
gchar *fulltemplate;
|
||
|
||
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
|
||
|
||
if (g_get_tmp_name (tmpl, &fulltemplate, wrap_g_mkdir, 0, 0700, error) == -1)
|
||
return NULL;
|
||
else
|
||
return fulltemplate;
|
||
}
|
||
|
||
static gchar *
|
||
g_build_path_va (const gchar *separator,
|
||
const gchar *first_element,
|
||
va_list *args,
|
||
gchar **str_array)
|
||
{
|
||
GString *result;
|
||
gint separator_len = strlen (separator);
|
||
gboolean is_first = TRUE;
|
||
gboolean have_leading = FALSE;
|
||
const gchar *single_element = NULL;
|
||
const gchar *next_element;
|
||
const gchar *last_trailing = NULL;
|
||
gint i = 0;
|
||
|
||
result = g_string_new (NULL);
|
||
|
||
if (str_array)
|
||
next_element = str_array[i++];
|
||
else
|
||
next_element = first_element;
|
||
|
||
while (TRUE)
|
||
{
|
||
const gchar *element;
|
||
const gchar *start;
|
||
const gchar *end;
|
||
|
||
if (next_element)
|
||
{
|
||
element = next_element;
|
||
if (str_array)
|
||
next_element = str_array[i++];
|
||
else
|
||
next_element = va_arg (*args, gchar *);
|
||
}
|
||
else
|
||
break;
|
||
|
||
/* Ignore empty elements */
|
||
if (!*element)
|
||
continue;
|
||
|
||
start = element;
|
||
|
||
if (separator_len)
|
||
{
|
||
while (strncmp (start, separator, separator_len) == 0)
|
||
start += separator_len;
|
||
}
|
||
|
||
end = start + strlen (start);
|
||
|
||
if (separator_len)
|
||
{
|
||
while (end >= start + separator_len &&
|
||
strncmp (end - separator_len, separator, separator_len) == 0)
|
||
end -= separator_len;
|
||
|
||
last_trailing = end;
|
||
while (last_trailing >= element + separator_len &&
|
||
strncmp (last_trailing - separator_len, separator, separator_len) == 0)
|
||
last_trailing -= separator_len;
|
||
|
||
if (!have_leading)
|
||
{
|
||
/* If the leading and trailing separator strings are in the
|
||
* same element and overlap, the result is exactly that element
|
||
*/
|
||
if (last_trailing <= start)
|
||
single_element = element;
|
||
|
||
g_string_append_len (result, element, start - element);
|
||
have_leading = TRUE;
|
||
}
|
||
else
|
||
single_element = NULL;
|
||
}
|
||
|
||
if (end == start)
|
||
continue;
|
||
|
||
if (!is_first)
|
||
g_string_append (result, separator);
|
||
|
||
g_string_append_len (result, start, end - start);
|
||
is_first = FALSE;
|
||
}
|
||
|
||
if (single_element)
|
||
{
|
||
g_string_free (result, TRUE);
|
||
return g_strdup (single_element);
|
||
}
|
||
else
|
||
{
|
||
if (last_trailing)
|
||
g_string_append (result, last_trailing);
|
||
|
||
return g_string_free (result, FALSE);
|
||
}
|
||
}
|
||
|
||
/**
|
||
* g_build_pathv:
|
||
* @separator: a string used to separator the elements of the path.
|
||
* @args: (array zero-terminated=1) (element-type filename): %NULL-terminated
|
||
* array of strings containing the path elements.
|
||
*
|
||
* Behaves exactly like g_build_path(), but takes the path elements
|
||
* as a string array, instead of variadic arguments.
|
||
*
|
||
* This function is mainly meant for language bindings.
|
||
*
|
||
* Returns: (type filename) (transfer full): a newly-allocated string that
|
||
* must be freed with g_free().
|
||
*
|
||
* Since: 2.8
|
||
*/
|
||
gchar *
|
||
g_build_pathv (const gchar *separator,
|
||
gchar **args)
|
||
{
|
||
if (!args)
|
||
return NULL;
|
||
|
||
return g_build_path_va (separator, NULL, NULL, args);
|
||
}
|
||
|
||
|
||
/**
|
||
* g_build_path:
|
||
* @separator: (type filename): a string used to separator the elements of the path.
|
||
* @first_element: (type filename): the first element in the path
|
||
* @...: remaining elements in path, terminated by %NULL
|
||
*
|
||
* Creates a path from a series of elements using @separator as the
|
||
* separator between elements.
|
||
*
|
||
* At the boundary between two elements, any trailing occurrences of
|
||
* separator in the first element, or leading occurrences of separator
|
||
* in the second element are removed and exactly one copy of the
|
||
* separator is inserted.
|
||
*
|
||
* Empty elements are ignored.
|
||
*
|
||
* The number of leading copies of the separator on the result is
|
||
* the same as the number of leading copies of the separator on
|
||
* the first non-empty element.
|
||
*
|
||
* The number of trailing copies of the separator on the result is
|
||
* the same as the number of trailing copies of the separator on
|
||
* the last non-empty element. (Determination of the number of
|
||
* trailing copies is done without stripping leading copies, so
|
||
* if the separator is `ABA`, then `ABABA` has 1 trailing copy.)
|
||
*
|
||
* However, if there is only a single non-empty element, and there
|
||
* are no characters in that element not part of the leading or
|
||
* trailing separators, then the result is exactly the original value
|
||
* of that element.
|
||
*
|
||
* Other than for determination of the number of leading and trailing
|
||
* copies of the separator, elements consisting only of copies
|
||
* of the separator are ignored.
|
||
*
|
||
* Returns: (type filename) (transfer full): the newly allocated path
|
||
**/
|
||
gchar *
|
||
g_build_path (const gchar *separator,
|
||
const gchar *first_element,
|
||
...)
|
||
{
|
||
gchar *str;
|
||
va_list args;
|
||
|
||
g_return_val_if_fail (separator != NULL, NULL);
|
||
|
||
va_start (args, first_element);
|
||
str = g_build_path_va (separator, first_element, &args, NULL);
|
||
va_end (args);
|
||
|
||
return str;
|
||
}
|
||
|
||
#ifdef G_OS_WIN32
|
||
|
||
static gchar *
|
||
g_build_pathname_va (const gchar *first_element,
|
||
va_list *args,
|
||
gchar **str_array)
|
||
{
|
||
/* Code copied from g_build_pathv(), and modified to use two
|
||
* alternative single-character separators.
|
||
*/
|
||
GString *result;
|
||
gboolean is_first = TRUE;
|
||
gboolean have_leading = FALSE;
|
||
const gchar *single_element = NULL;
|
||
const gchar *next_element;
|
||
const gchar *last_trailing = NULL;
|
||
gchar current_separator = '\\';
|
||
gint i = 0;
|
||
|
||
result = g_string_new (NULL);
|
||
|
||
if (str_array)
|
||
next_element = str_array[i++];
|
||
else
|
||
next_element = first_element;
|
||
|
||
while (TRUE)
|
||
{
|
||
const gchar *element;
|
||
const gchar *start;
|
||
const gchar *end;
|
||
|
||
if (next_element)
|
||
{
|
||
element = next_element;
|
||
if (str_array)
|
||
next_element = str_array[i++];
|
||
else
|
||
next_element = va_arg (*args, gchar *);
|
||
}
|
||
else
|
||
break;
|
||
|
||
/* Ignore empty elements */
|
||
if (!*element)
|
||
continue;
|
||
|
||
start = element;
|
||
|
||
if (TRUE)
|
||
{
|
||
while (start &&
|
||
(*start == '\\' || *start == '/'))
|
||
{
|
||
current_separator = *start;
|
||
start++;
|
||
}
|
||
}
|
||
|
||
end = start + strlen (start);
|
||
|
||
if (TRUE)
|
||
{
|
||
while (end >= start + 1 &&
|
||
(end[-1] == '\\' || end[-1] == '/'))
|
||
{
|
||
current_separator = end[-1];
|
||
end--;
|
||
}
|
||
|
||
last_trailing = end;
|
||
while (last_trailing >= element + 1 &&
|
||
(last_trailing[-1] == '\\' || last_trailing[-1] == '/'))
|
||
last_trailing--;
|
||
|
||
if (!have_leading)
|
||
{
|
||
/* If the leading and trailing separator strings are in the
|
||
* same element and overlap, the result is exactly that element
|
||
*/
|
||
if (last_trailing <= start)
|
||
single_element = element;
|
||
|
||
g_string_append_len (result, element, start - element);
|
||
have_leading = TRUE;
|
||
}
|
||
else
|
||
single_element = NULL;
|
||
}
|
||
|
||
if (end == start)
|
||
continue;
|
||
|
||
if (!is_first)
|
||
g_string_append_len (result, ¤t_separator, 1);
|
||
|
||
g_string_append_len (result, start, end - start);
|
||
is_first = FALSE;
|
||
}
|
||
|
||
if (single_element)
|
||
{
|
||
g_string_free (result, TRUE);
|
||
return g_strdup (single_element);
|
||
}
|
||
else
|
||
{
|
||
if (last_trailing)
|
||
g_string_append (result, last_trailing);
|
||
|
||
return g_string_free (result, FALSE);
|
||
}
|
||
}
|
||
|
||
#endif
|
||
|
||
static gchar *
|
||
g_build_filename_va (const gchar *first_argument,
|
||
va_list *args,
|
||
gchar **str_array)
|
||
{
|
||
gchar *str;
|
||
|
||
#ifndef G_OS_WIN32
|
||
str = g_build_path_va (G_DIR_SEPARATOR_S, first_argument, args, str_array);
|
||
#else
|
||
str = g_build_pathname_va (first_argument, args, str_array);
|
||
#endif
|
||
|
||
return str;
|
||
}
|
||
|
||
/**
|
||
* g_build_filename_valist:
|
||
* @first_element: (type filename): the first element in the path
|
||
* @args: va_list of remaining elements in path
|
||
*
|
||
* Creates a filename from a list of elements using the correct
|
||
* separator for the current platform.
|
||
*
|
||
* Behaves exactly like g_build_filename(), but takes the path elements
|
||
* as a va_list.
|
||
*
|
||
* This function is mainly meant for implementing other variadic arguments
|
||
* functions.
|
||
*
|
||
* Returns: (type filename) (transfer full): the newly allocated path
|
||
*
|
||
* Since: 2.56
|
||
*/
|
||
gchar *
|
||
g_build_filename_valist (const gchar *first_element,
|
||
va_list *args)
|
||
{
|
||
g_return_val_if_fail (first_element != NULL, NULL);
|
||
|
||
return g_build_filename_va (first_element, args, NULL);
|
||
}
|
||
|
||
/**
|
||
* g_build_filenamev:
|
||
* @args: (array zero-terminated=1) (element-type filename): %NULL-terminated
|
||
* array of strings containing the path elements.
|
||
*
|
||
* Creates a filename from a vector of elements using the correct
|
||
* separator for the current platform.
|
||
*
|
||
* This function behaves exactly like g_build_filename(), but takes the path
|
||
* elements as a string array, instead of varargs. This function is mainly
|
||
* meant for language bindings.
|
||
*
|
||
* If you are building a path programmatically you may want to use
|
||
* #GPathBuf instead.
|
||
*
|
||
* Returns: (type filename) (transfer full): the newly allocated path
|
||
*
|
||
* Since: 2.8
|
||
*/
|
||
gchar *
|
||
g_build_filenamev (gchar **args)
|
||
{
|
||
return g_build_filename_va (NULL, NULL, args);
|
||
}
|
||
|
||
/**
|
||
* g_build_filename:
|
||
* @first_element: (type filename): the first element in the path
|
||
* @...: remaining elements in path, terminated by %NULL
|
||
*
|
||
* Creates a filename from a series of elements using the correct
|
||
* separator for the current platform.
|
||
*
|
||
* On Unix, this function behaves identically to `g_build_path
|
||
* (G_DIR_SEPARATOR_S, first_element, ....)`.
|
||
*
|
||
* On Windows, it takes into account that either the backslash
|
||
* (`\` or slash (`/`) can be used as separator in filenames, but
|
||
* otherwise behaves as on UNIX. When file pathname separators need
|
||
* to be inserted, the one that last previously occurred in the
|
||
* parameters (reading from left to right) is used.
|
||
*
|
||
* No attempt is made to force the resulting filename to be an absolute
|
||
* path. If the first element is a relative path, the result will
|
||
* be a relative path.
|
||
*
|
||
* If you are building a path programmatically you may want to use
|
||
* #GPathBuf instead.
|
||
*
|
||
* Returns: (type filename) (transfer full): the newly allocated path
|
||
*/
|
||
gchar *
|
||
g_build_filename (const gchar *first_element,
|
||
...)
|
||
{
|
||
gchar *str;
|
||
va_list args;
|
||
|
||
va_start (args, first_element);
|
||
str = g_build_filename_va (first_element, &args, NULL);
|
||
va_end (args);
|
||
|
||
return str;
|
||
}
|
||
|
||
/**
|
||
* g_file_read_link:
|
||
* @filename: (type filename): the symbolic link
|
||
* @error: return location for a #GError
|
||
*
|
||
* Reads the contents of the symbolic link @filename like the POSIX
|
||
* `readlink()` function.
|
||
*
|
||
* The returned string is in the encoding used for filenames. Use
|
||
* g_filename_to_utf8() to convert it to UTF-8.
|
||
*
|
||
* The returned string may also be a relative path. Use g_build_filename()
|
||
* to convert it to an absolute path:
|
||
*
|
||
* |[<!-- language="C" -->
|
||
* g_autoptr(GError) local_error = NULL;
|
||
* g_autofree gchar *link_target = g_file_read_link ("/etc/localtime", &local_error);
|
||
*
|
||
* if (local_error != NULL)
|
||
* g_error ("Error reading link: %s", local_error->message);
|
||
*
|
||
* if (!g_path_is_absolute (link_target))
|
||
* {
|
||
* g_autofree gchar *absolute_link_target = g_build_filename ("/etc", link_target, NULL);
|
||
* g_free (link_target);
|
||
* link_target = g_steal_pointer (&absolute_link_target);
|
||
* }
|
||
* ]|
|
||
*
|
||
* Returns: (type filename) (transfer full): A newly-allocated string with
|
||
* the contents of the symbolic link, or %NULL if an error occurred.
|
||
*
|
||
* Since: 2.4
|
||
*/
|
||
gchar *
|
||
g_file_read_link (const gchar *filename,
|
||
GError **error)
|
||
{
|
||
#if defined (HAVE_READLINK)
|
||
gchar *buffer;
|
||
size_t size;
|
||
gssize read_size;
|
||
|
||
g_return_val_if_fail (filename != NULL, NULL);
|
||
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
|
||
|
||
size = 256;
|
||
buffer = g_malloc (size);
|
||
|
||
while (TRUE)
|
||
{
|
||
read_size = readlink (filename, buffer, size);
|
||
if (read_size < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Failed to read the symbolic link “%s”: %s"),
|
||
saved_errno);
|
||
g_free (buffer);
|
||
return NULL;
|
||
}
|
||
|
||
if ((size_t) read_size < size)
|
||
{
|
||
buffer[read_size] = 0;
|
||
return buffer;
|
||
}
|
||
|
||
size *= 2;
|
||
buffer = g_realloc (buffer, size);
|
||
}
|
||
#elif defined (G_OS_WIN32)
|
||
gchar *buffer;
|
||
gssize read_size;
|
||
|
||
g_return_val_if_fail (filename != NULL, NULL);
|
||
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
|
||
|
||
read_size = g_win32_readlink_utf8 (filename, NULL, 0, &buffer, TRUE);
|
||
if (read_size < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
if (error)
|
||
set_file_error (error,
|
||
filename,
|
||
_("Failed to read the symbolic link “%s”: %s"),
|
||
saved_errno);
|
||
return NULL;
|
||
}
|
||
else if (read_size == 0)
|
||
return strdup ("");
|
||
else
|
||
return buffer;
|
||
#else
|
||
g_return_val_if_fail (filename != NULL, NULL);
|
||
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
|
||
|
||
g_set_error_literal (error,
|
||
G_FILE_ERROR,
|
||
G_FILE_ERROR_INVAL,
|
||
_("Symbolic links not supported"));
|
||
|
||
return NULL;
|
||
#endif
|
||
}
|
||
|
||
/**
|
||
* g_path_is_absolute:
|
||
* @file_name: (type filename): a file name
|
||
*
|
||
* Returns %TRUE if the given @file_name is an absolute file name.
|
||
* Note that this is a somewhat vague concept on Windows.
|
||
*
|
||
* On POSIX systems, an absolute file name is well-defined. It always
|
||
* starts from the single root directory. For example "/usr/local".
|
||
*
|
||
* On Windows, the concepts of current drive and drive-specific
|
||
* current directory introduce vagueness. This function interprets as
|
||
* an absolute file name one that either begins with a directory
|
||
* separator such as "\Users\tml" or begins with the root on a drive,
|
||
* for example "C:\Windows". The first case also includes UNC paths
|
||
* such as "\\\\myserver\docs\foo". In all cases, either slashes or
|
||
* backslashes are accepted.
|
||
*
|
||
* Note that a file name relative to the current drive root does not
|
||
* truly specify a file uniquely over time and across processes, as
|
||
* the current drive is a per-process value and can be changed.
|
||
*
|
||
* File names relative the current directory on some specific drive,
|
||
* such as "D:foo/bar", are not interpreted as absolute by this
|
||
* function, but they obviously are not relative to the normal current
|
||
* directory as returned by getcwd() or g_get_current_dir()
|
||
* either. Such paths should be avoided, or need to be handled using
|
||
* Windows-specific code.
|
||
*
|
||
* Returns: %TRUE if @file_name is absolute
|
||
*/
|
||
gboolean
|
||
g_path_is_absolute (const gchar *file_name)
|
||
{
|
||
g_return_val_if_fail (file_name != NULL, FALSE);
|
||
|
||
if (G_IS_DIR_SEPARATOR (file_name[0]))
|
||
return TRUE;
|
||
|
||
#ifdef G_OS_WIN32
|
||
/* Recognize drive letter on native Windows */
|
||
if (g_ascii_isalpha (file_name[0]) &&
|
||
file_name[1] == ':' && G_IS_DIR_SEPARATOR (file_name[2]))
|
||
return TRUE;
|
||
#endif
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
/**
|
||
* g_path_skip_root:
|
||
* @file_name: (type filename): a file name
|
||
*
|
||
* Returns a pointer into @file_name after the root component,
|
||
* i.e. after the "/" in UNIX or "C:\" under Windows. If @file_name
|
||
* is not an absolute path it returns %NULL.
|
||
*
|
||
* Returns: (type filename) (nullable): a pointer into @file_name after the
|
||
* root component
|
||
*/
|
||
const gchar *
|
||
g_path_skip_root (const gchar *file_name)
|
||
{
|
||
g_return_val_if_fail (file_name != NULL, NULL);
|
||
|
||
#ifdef G_PLATFORM_WIN32
|
||
/* Skip \\server\share or //server/share */
|
||
if (G_IS_DIR_SEPARATOR (file_name[0]) &&
|
||
G_IS_DIR_SEPARATOR (file_name[1]) &&
|
||
file_name[2] &&
|
||
!G_IS_DIR_SEPARATOR (file_name[2]))
|
||
{
|
||
gchar *p;
|
||
p = strchr (file_name + 2, G_DIR_SEPARATOR);
|
||
|
||
#ifdef G_OS_WIN32
|
||
{
|
||
gchar *q;
|
||
|
||
q = strchr (file_name + 2, '/');
|
||
if (p == NULL || (q != NULL && q < p))
|
||
p = q;
|
||
}
|
||
#endif
|
||
|
||
if (p && p > file_name + 2 && p[1])
|
||
{
|
||
file_name = p + 1;
|
||
|
||
while (file_name[0] && !G_IS_DIR_SEPARATOR (file_name[0]))
|
||
file_name++;
|
||
|
||
/* Possibly skip a backslash after the share name */
|
||
if (G_IS_DIR_SEPARATOR (file_name[0]))
|
||
file_name++;
|
||
|
||
return (gchar *)file_name;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/* Skip initial slashes */
|
||
if (G_IS_DIR_SEPARATOR (file_name[0]))
|
||
{
|
||
while (G_IS_DIR_SEPARATOR (file_name[0]))
|
||
file_name++;
|
||
return (gchar *)file_name;
|
||
}
|
||
|
||
#ifdef G_OS_WIN32
|
||
/* Skip X:\ */
|
||
if (g_ascii_isalpha (file_name[0]) &&
|
||
file_name[1] == ':' &&
|
||
G_IS_DIR_SEPARATOR (file_name[2]))
|
||
return (gchar *)file_name + 3;
|
||
#endif
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/**
|
||
* g_basename:
|
||
* @file_name: (type filename): the name of the file
|
||
*
|
||
* Gets the name of the file without any leading directory
|
||
* components. It returns a pointer into the given file name
|
||
* string.
|
||
*
|
||
* Returns: (type filename): the name of the file without any leading
|
||
* directory components
|
||
*
|
||
* Deprecated:2.2: Use g_path_get_basename() instead, but notice
|
||
* that g_path_get_basename() allocates new memory for the
|
||
* returned string, unlike this function which returns a pointer
|
||
* into the argument.
|
||
*/
|
||
const gchar *
|
||
g_basename (const gchar *file_name)
|
||
{
|
||
gchar *base;
|
||
|
||
g_return_val_if_fail (file_name != NULL, NULL);
|
||
|
||
base = strrchr (file_name, G_DIR_SEPARATOR);
|
||
|
||
#ifdef G_OS_WIN32
|
||
{
|
||
gchar *q;
|
||
q = strrchr (file_name, '/');
|
||
if (base == NULL || (q != NULL && q > base))
|
||
base = q;
|
||
}
|
||
#endif
|
||
|
||
if (base)
|
||
return base + 1;
|
||
|
||
#ifdef G_OS_WIN32
|
||
if (g_ascii_isalpha (file_name[0]) && file_name[1] == ':')
|
||
return (gchar*) file_name + 2;
|
||
#endif
|
||
|
||
return (gchar*) file_name;
|
||
}
|
||
|
||
/**
|
||
* g_path_get_basename:
|
||
* @file_name: (type filename): the name of the file
|
||
*
|
||
* Gets the last component of the filename.
|
||
*
|
||
* If @file_name ends with a directory separator it gets the component
|
||
* before the last slash. If @file_name consists only of directory
|
||
* separators (and on Windows, possibly a drive letter), a single
|
||
* separator is returned. If @file_name is empty, it gets ".".
|
||
*
|
||
* Returns: (type filename) (transfer full): a newly allocated string
|
||
* containing the last component of the filename
|
||
*/
|
||
gchar *
|
||
g_path_get_basename (const gchar *file_name)
|
||
{
|
||
gssize base;
|
||
gssize last_nonslash;
|
||
gsize len;
|
||
gchar *retval;
|
||
|
||
g_return_val_if_fail (file_name != NULL, NULL);
|
||
|
||
if (file_name[0] == '\0')
|
||
return g_strdup (".");
|
||
|
||
last_nonslash = strlen (file_name) - 1;
|
||
|
||
while (last_nonslash >= 0 && G_IS_DIR_SEPARATOR (file_name [last_nonslash]))
|
||
last_nonslash--;
|
||
|
||
if (last_nonslash == -1)
|
||
/* string only containing slashes */
|
||
return g_strdup (G_DIR_SEPARATOR_S);
|
||
|
||
#ifdef G_OS_WIN32
|
||
if (last_nonslash == 1 &&
|
||
g_ascii_isalpha (file_name[0]) &&
|
||
file_name[1] == ':')
|
||
/* string only containing slashes and a drive */
|
||
return g_strdup (G_DIR_SEPARATOR_S);
|
||
#endif
|
||
base = last_nonslash;
|
||
|
||
while (base >=0 && !G_IS_DIR_SEPARATOR (file_name [base]))
|
||
base--;
|
||
|
||
#ifdef G_OS_WIN32
|
||
if (base == -1 &&
|
||
g_ascii_isalpha (file_name[0]) &&
|
||
file_name[1] == ':')
|
||
base = 1;
|
||
#endif /* G_OS_WIN32 */
|
||
|
||
len = last_nonslash - base;
|
||
retval = g_malloc (len + 1);
|
||
memcpy (retval, file_name + (base + 1), len);
|
||
retval [len] = '\0';
|
||
|
||
return retval;
|
||
}
|
||
|
||
/**
|
||
* g_dirname:
|
||
* @file_name: (type filename): the name of the file
|
||
*
|
||
* Gets the directory components of a file name.
|
||
*
|
||
* If the file name has no directory components "." is returned.
|
||
* The returned string should be freed when no longer needed.
|
||
*
|
||
* Returns: (type filename) (transfer full): the directory components of the file
|
||
*
|
||
* Deprecated: use g_path_get_dirname() instead
|
||
*/
|
||
|
||
/**
|
||
* g_path_get_dirname:
|
||
* @file_name: (type filename): the name of the file
|
||
*
|
||
* Gets the directory components of a file name. For example, the directory
|
||
* component of `/usr/bin/test` is `/usr/bin`. The directory component of `/`
|
||
* is `/`.
|
||
*
|
||
* If the file name has no directory components "." is returned.
|
||
* The returned string should be freed when no longer needed.
|
||
*
|
||
* Returns: (type filename) (transfer full): the directory components of the file
|
||
*/
|
||
gchar *
|
||
g_path_get_dirname (const gchar *file_name)
|
||
{
|
||
gchar *base;
|
||
gsize len;
|
||
|
||
g_return_val_if_fail (file_name != NULL, NULL);
|
||
|
||
base = strrchr (file_name, G_DIR_SEPARATOR);
|
||
|
||
#ifdef G_OS_WIN32
|
||
{
|
||
gchar *q;
|
||
q = strrchr (file_name, '/');
|
||
if (base == NULL || (q != NULL && q > base))
|
||
base = q;
|
||
}
|
||
#endif
|
||
|
||
if (!base)
|
||
{
|
||
#ifdef G_OS_WIN32
|
||
if (g_ascii_isalpha (file_name[0]) && file_name[1] == ':')
|
||
{
|
||
gchar drive_colon_dot[4];
|
||
|
||
drive_colon_dot[0] = file_name[0];
|
||
drive_colon_dot[1] = ':';
|
||
drive_colon_dot[2] = '.';
|
||
drive_colon_dot[3] = '\0';
|
||
|
||
return g_strdup (drive_colon_dot);
|
||
}
|
||
#endif
|
||
return g_strdup (".");
|
||
}
|
||
|
||
while (base > file_name && G_IS_DIR_SEPARATOR (*base))
|
||
base--;
|
||
|
||
#ifdef G_OS_WIN32
|
||
/* base points to the char before the last slash.
|
||
*
|
||
* In case file_name is the root of a drive (X:\) or a child of the
|
||
* root of a drive (X:\foo), include the slash.
|
||
*
|
||
* In case file_name is the root share of an UNC path
|
||
* (\\server\share), add a slash, returning \\server\share\ .
|
||
*
|
||
* In case file_name is a direct child of a share in an UNC path
|
||
* (\\server\share\foo), include the slash after the share name,
|
||
* returning \\server\share\ .
|
||
*/
|
||
if (base == file_name + 1 &&
|
||
g_ascii_isalpha (file_name[0]) &&
|
||
file_name[1] == ':')
|
||
base++;
|
||
else if (G_IS_DIR_SEPARATOR (file_name[0]) &&
|
||
G_IS_DIR_SEPARATOR (file_name[1]) &&
|
||
file_name[2] &&
|
||
!G_IS_DIR_SEPARATOR (file_name[2]) &&
|
||
base >= file_name + 2)
|
||
{
|
||
const gchar *p = file_name + 2;
|
||
while (*p && !G_IS_DIR_SEPARATOR (*p))
|
||
p++;
|
||
if (p == base + 1)
|
||
{
|
||
len = (guint) strlen (file_name) + 1;
|
||
base = g_new (gchar, len + 1);
|
||
strcpy (base, file_name);
|
||
base[len-1] = G_DIR_SEPARATOR;
|
||
base[len] = 0;
|
||
return base;
|
||
}
|
||
if (G_IS_DIR_SEPARATOR (*p))
|
||
{
|
||
p++;
|
||
while (*p && !G_IS_DIR_SEPARATOR (*p))
|
||
p++;
|
||
if (p == base + 1)
|
||
base++;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
len = (guint) 1 + base - file_name;
|
||
base = g_new (gchar, len + 1);
|
||
memmove (base, file_name, len);
|
||
base[len] = 0;
|
||
|
||
return base;
|
||
}
|
||
|
||
/**
|
||
* g_canonicalize_filename:
|
||
* @filename: (type filename): the name of the file
|
||
* @relative_to: (type filename) (nullable): the relative directory, or %NULL
|
||
* to use the current working directory
|
||
*
|
||
* Gets the canonical file name from @filename. All triple slashes are turned into
|
||
* single slashes, and all `..` and `.`s resolved against @relative_to.
|
||
*
|
||
* Symlinks are not followed, and the returned path is guaranteed to be absolute.
|
||
*
|
||
* If @filename is an absolute path, @relative_to is ignored. Otherwise,
|
||
* @relative_to will be prepended to @filename to make it absolute. @relative_to
|
||
* must be an absolute path, or %NULL. If @relative_to is %NULL, it'll fallback
|
||
* to g_get_current_dir().
|
||
*
|
||
* This function never fails, and will canonicalize file paths even if they don't
|
||
* exist.
|
||
*
|
||
* No file system I/O is done.
|
||
*
|
||
* Returns: (type filename) (transfer full): a newly allocated string with the
|
||
* canonical file path
|
||
*
|
||
* Since: 2.58
|
||
*/
|
||
gchar *
|
||
g_canonicalize_filename (const gchar *filename,
|
||
const gchar *relative_to)
|
||
{
|
||
gchar *canon, *input, *output, *after_root, *output_start;
|
||
|
||
g_return_val_if_fail (relative_to == NULL || g_path_is_absolute (relative_to), NULL);
|
||
|
||
if (!g_path_is_absolute (filename))
|
||
{
|
||
gchar *cwd_allocated = NULL;
|
||
const gchar *cwd;
|
||
|
||
if (relative_to != NULL)
|
||
cwd = relative_to;
|
||
else
|
||
cwd = cwd_allocated = g_get_current_dir ();
|
||
|
||
canon = g_build_filename (cwd, filename, NULL);
|
||
g_free (cwd_allocated);
|
||
}
|
||
else
|
||
{
|
||
canon = g_strdup (filename);
|
||
}
|
||
|
||
after_root = (char *)g_path_skip_root (canon);
|
||
|
||
if (after_root == NULL)
|
||
{
|
||
/* This shouldn't really happen, as g_get_current_dir() should
|
||
return an absolute pathname, but bug 573843 shows this is
|
||
not always happening */
|
||
g_free (canon);
|
||
return g_build_filename (G_DIR_SEPARATOR_S, filename, NULL);
|
||
}
|
||
|
||
/* Find the first dir separator and use the canonical dir separator. */
|
||
for (output = after_root - 1;
|
||
(output >= canon) && G_IS_DIR_SEPARATOR (*output);
|
||
output--)
|
||
*output = G_DIR_SEPARATOR;
|
||
|
||
/* 1 to re-increment after the final decrement above (so that output >= canon),
|
||
* and 1 to skip the first `/`. There might not be a first `/` if
|
||
* the @canon is a Windows `//server/share` style path with no
|
||
* trailing directories. @after_root will be '\0' in that case. */
|
||
output++;
|
||
if (*output == G_DIR_SEPARATOR)
|
||
output++;
|
||
|
||
/* POSIX allows double slashes at the start to mean something special
|
||
* (as does windows too). So, "//" != "/", but more than two slashes
|
||
* is treated as "/".
|
||
*/
|
||
if (after_root - output == 1)
|
||
output++;
|
||
|
||
input = after_root;
|
||
output_start = output;
|
||
while (*input)
|
||
{
|
||
/* input points to the next non-separator to be processed. */
|
||
/* output points to the next location to write to. */
|
||
g_assert (input > canon && G_IS_DIR_SEPARATOR (input[-1]));
|
||
g_assert (output > canon && G_IS_DIR_SEPARATOR (output[-1]));
|
||
g_assert (input >= output);
|
||
|
||
/* Ignore repeated dir separators. */
|
||
while (G_IS_DIR_SEPARATOR (input[0]))
|
||
input++;
|
||
|
||
/* Ignore single dot directory components. */
|
||
if (input[0] == '.' && (input[1] == 0 || G_IS_DIR_SEPARATOR (input[1])))
|
||
{
|
||
if (input[1] == 0)
|
||
break;
|
||
input += 2;
|
||
}
|
||
/* Remove double-dot directory components along with the preceding
|
||
* path component. */
|
||
else if (input[0] == '.' && input[1] == '.' &&
|
||
(input[2] == 0 || G_IS_DIR_SEPARATOR (input[2])))
|
||
{
|
||
if (output > output_start)
|
||
{
|
||
do
|
||
{
|
||
output--;
|
||
}
|
||
while (!G_IS_DIR_SEPARATOR (output[-1]) && output > output_start);
|
||
}
|
||
if (input[2] == 0)
|
||
break;
|
||
input += 3;
|
||
}
|
||
/* Copy the input to the output until the next separator,
|
||
* while converting it to canonical separator */
|
||
else
|
||
{
|
||
while (*input && !G_IS_DIR_SEPARATOR (*input))
|
||
*output++ = *input++;
|
||
if (input[0] == 0)
|
||
break;
|
||
input++;
|
||
*output++ = G_DIR_SEPARATOR;
|
||
}
|
||
}
|
||
|
||
/* Remove a potentially trailing dir separator */
|
||
if (output > output_start && G_IS_DIR_SEPARATOR (output[-1]))
|
||
output--;
|
||
|
||
*output = '\0';
|
||
|
||
return canon;
|
||
}
|
||
|
||
#if defined(MAXPATHLEN)
|
||
#define G_PATH_LENGTH MAXPATHLEN
|
||
#elif defined(PATH_MAX)
|
||
#define G_PATH_LENGTH PATH_MAX
|
||
#elif defined(_PC_PATH_MAX)
|
||
#define G_PATH_LENGTH sysconf(_PC_PATH_MAX)
|
||
#else
|
||
#define G_PATH_LENGTH 2048
|
||
#endif
|
||
|
||
/**
|
||
* g_get_current_dir:
|
||
*
|
||
* Gets the current directory.
|
||
*
|
||
* The returned string should be freed when no longer needed.
|
||
* The encoding of the returned string is system defined.
|
||
* On Windows, it is always UTF-8.
|
||
*
|
||
* Since GLib 2.40, this function will return the value of the "PWD"
|
||
* environment variable if it is set and it happens to be the same as
|
||
* the current directory. This can make a difference in the case that
|
||
* the current directory is the target of a symbolic link.
|
||
*
|
||
* Returns: (type filename) (transfer full): the current directory
|
||
*/
|
||
gchar *
|
||
g_get_current_dir (void)
|
||
{
|
||
#ifdef G_OS_WIN32
|
||
|
||
gchar *dir = NULL;
|
||
wchar_t dummy[2], *wdir;
|
||
DWORD len;
|
||
|
||
len = GetCurrentDirectoryW (2, dummy);
|
||
wdir = g_new (wchar_t, len);
|
||
|
||
if (GetCurrentDirectoryW (len, wdir) == len - 1)
|
||
dir = g_utf16_to_utf8 (wdir, -1, NULL, NULL, NULL);
|
||
|
||
g_free (wdir);
|
||
|
||
if (dir == NULL)
|
||
dir = g_strdup ("\\");
|
||
|
||
return dir;
|
||
|
||
#else
|
||
const gchar *pwd;
|
||
gchar *buffer = NULL;
|
||
gchar *dir = NULL;
|
||
static gsize buffer_size = 0;
|
||
struct stat pwdbuf, dotbuf;
|
||
|
||
pwd = g_getenv ("PWD");
|
||
if (pwd != NULL &&
|
||
g_stat (".", &dotbuf) == 0 && g_stat (pwd, &pwdbuf) == 0 &&
|
||
dotbuf.st_dev == pwdbuf.st_dev && dotbuf.st_ino == pwdbuf.st_ino)
|
||
return g_strdup (pwd);
|
||
|
||
if (buffer_size == 0)
|
||
buffer_size = (G_PATH_LENGTH == -1) ? 2048 : G_PATH_LENGTH;
|
||
|
||
while (buffer_size < G_MAXSIZE / 2)
|
||
{
|
||
g_free (buffer);
|
||
buffer = g_new (gchar, buffer_size);
|
||
*buffer = 0;
|
||
dir = getcwd (buffer, buffer_size);
|
||
|
||
if (dir || errno != ERANGE)
|
||
break;
|
||
|
||
buffer_size *= 2;
|
||
}
|
||
|
||
/* Check that getcwd() nul-terminated the string. It should do, but the specs
|
||
* don’t actually explicitly state that:
|
||
* https://pubs.opengroup.org/onlinepubs/9699919799/functions/getcwd.html */
|
||
g_assert (dir == NULL || strnlen (dir, buffer_size) < buffer_size);
|
||
|
||
if (!dir || !*buffer)
|
||
{
|
||
/* Fallback return value */
|
||
g_assert (buffer_size >= 2);
|
||
buffer[0] = G_DIR_SEPARATOR;
|
||
buffer[1] = 0;
|
||
}
|
||
|
||
dir = g_strdup (buffer);
|
||
g_free (buffer);
|
||
|
||
return dir;
|
||
|
||
#endif /* !G_OS_WIN32 */
|
||
}
|
||
|
||
#ifdef G_OS_WIN32
|
||
|
||
/* Binary compatibility versions. Not for newly compiled code. */
|
||
|
||
_GLIB_EXTERN gboolean g_file_test_utf8 (const gchar *filename,
|
||
GFileTest test);
|
||
_GLIB_EXTERN gboolean g_file_get_contents_utf8 (const gchar *filename,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error);
|
||
_GLIB_EXTERN gint g_mkstemp_utf8 (gchar *tmpl);
|
||
_GLIB_EXTERN gint g_file_open_tmp_utf8 (const gchar *tmpl,
|
||
gchar **name_used,
|
||
GError **error);
|
||
_GLIB_EXTERN gchar *g_get_current_dir_utf8 (void);
|
||
|
||
|
||
gboolean
|
||
g_file_test_utf8 (const gchar *filename,
|
||
GFileTest test)
|
||
{
|
||
return g_file_test (filename, test);
|
||
}
|
||
|
||
gboolean
|
||
g_file_get_contents_utf8 (const gchar *filename,
|
||
gchar **contents,
|
||
gsize *length,
|
||
GError **error)
|
||
{
|
||
return g_file_get_contents (filename, contents, length, error);
|
||
}
|
||
|
||
gint
|
||
g_mkstemp_utf8 (gchar *tmpl)
|
||
{
|
||
return g_mkstemp (tmpl);
|
||
}
|
||
|
||
gint
|
||
g_file_open_tmp_utf8 (const gchar *tmpl,
|
||
gchar **name_used,
|
||
GError **error)
|
||
{
|
||
return g_file_open_tmp (tmpl, name_used, error);
|
||
}
|
||
|
||
gchar *
|
||
g_get_current_dir_utf8 (void)
|
||
{
|
||
return g_get_current_dir ();
|
||
}
|
||
|
||
#endif
|