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glib/glib/gutils.c
Philip Withnall 91a6ec8d07 gutils: Clarify return values of g_bit_nth_[lsf|msf]() 
Clarify in the documentation that both functions return -1 if no high
bits could be found.
2015-08-25 10:49:06 +01:00

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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1998 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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 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/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
/*
* MT safe for the unix part, FIXME: make the win32 part MT safe as well.
*/
#include "config.h"
#include "glibconfig.h"
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <locale.h>
#include <string.h>
#include <ctype.h> /* For tolower() */
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef G_OS_UNIX
#include <pwd.h>
#include <unistd.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_CRT_EXTERNS_H
#include <crt_externs.h> /* for _NSGetEnviron */
#endif
/* implement gutils's inline functions
*/
#define G_IMPLEMENT_INLINES 1
#define __G_UTILS_C__
#include "gutils.h"
#include "glib-init.h"
#include "glib-private.h"
#include "genviron.h"
#include "gfileutils.h"
#include "ggettext.h"
#include "ghash.h"
#include "gthread.h"
#include "gtestutils.h"
#include "gunicode.h"
#include "gstrfuncs.h"
#include "garray.h"
#include "glibintl.h"
#ifdef G_PLATFORM_WIN32
#include "gconvert.h"
#include "gwin32.h"
#endif
/**
* SECTION:misc_utils
* @title: Miscellaneous Utility Functions
* @short_description: a selection of portable utility functions
*
* These are portable utility functions.
*/
#ifdef G_PLATFORM_WIN32
# include <windows.h>
# ifndef GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
# define GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT 2
# define GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS 4
# endif
# include <lmcons.h> /* For UNLEN */
#endif /* G_PLATFORM_WIN32 */
#ifdef G_OS_WIN32
# include <direct.h>
# include <shlobj.h>
/* older SDK (e.g. msvc 5.0) does not have these*/
# ifndef CSIDL_MYMUSIC
# define CSIDL_MYMUSIC 13
# endif
# ifndef CSIDL_MYVIDEO
# define CSIDL_MYVIDEO 14
# endif
# ifndef CSIDL_INTERNET_CACHE
# define CSIDL_INTERNET_CACHE 32
# endif
# ifndef CSIDL_COMMON_APPDATA
# define CSIDL_COMMON_APPDATA 35
# endif
# ifndef CSIDL_MYPICTURES
# define CSIDL_MYPICTURES 0x27
# endif
# ifndef CSIDL_COMMON_DOCUMENTS
# define CSIDL_COMMON_DOCUMENTS 46
# endif
# ifndef CSIDL_PROFILE
# define CSIDL_PROFILE 40
# endif
# include <process.h>
#endif
#ifdef HAVE_CARBON
#include <CoreServices/CoreServices.h>
#endif
#ifdef HAVE_CODESET
#include <langinfo.h>
#endif
#ifdef G_PLATFORM_WIN32
gchar *
_glib_get_dll_directory (void)
{
gchar *retval;
gchar *p;
wchar_t wc_fn[MAX_PATH];
#ifdef DLL_EXPORT
if (glib_dll == NULL)
return NULL;
#endif
/* This code is different from that in
* g_win32_get_package_installation_directory_of_module() in that
* here we return the actual folder where the GLib DLL is. We don't
* do the check for it being in a "bin" or "lib" subfolder and then
* returning the parent of that.
*
* In a statically built GLib, glib_dll will be NULL and we will
* thus look up the application's .exe file's location.
*/
if (!GetModuleFileNameW (glib_dll, wc_fn, MAX_PATH))
return NULL;
retval = g_utf16_to_utf8 (wc_fn, -1, NULL, NULL, NULL);
p = strrchr (retval, G_DIR_SEPARATOR);
if (p == NULL)
{
/* Wtf? */
return NULL;
}
*p = '\0';
return retval;
}
#endif
/**
* g_memmove:
* @dest: the destination address to copy the bytes to.
* @src: the source address to copy the bytes from.
* @len: the number of bytes to copy.
*
* Copies a block of memory @len bytes long, from @src to @dest.
* The source and destination areas may overlap.
*
* Deprecated:2.40: Just use memmove().
*/
#ifdef G_OS_WIN32
#undef g_atexit
#endif
/**
* g_atexit:
* @func: (scope async): the function to call on normal program termination.
*
* Specifies a function to be called at normal program termination.
*
* Since GLib 2.8.2, on Windows g_atexit() actually is a preprocessor
* macro that maps to a call to the atexit() function in the C
* library. This means that in case the code that calls g_atexit(),
* i.e. atexit(), is in a DLL, the function will be called when the
* DLL is detached from the program. This typically makes more sense
* than that the function is called when the GLib DLL is detached,
* which happened earlier when g_atexit() was a function in the GLib
* DLL.
*
* The behaviour of atexit() in the context of dynamically loaded
* modules is not formally specified and varies wildly.
*
* On POSIX systems, calling g_atexit() (or atexit()) in a dynamically
* loaded module which is unloaded before the program terminates might
* well cause a crash at program exit.
*
* Some POSIX systems implement atexit() like Windows, and have each
* dynamically loaded module maintain an own atexit chain that is
* called when the module is unloaded.
*
* On other POSIX systems, before a dynamically loaded module is
* unloaded, the registered atexit functions (if any) residing in that
* module are called, regardless where the code that registered them
* resided. This is presumably the most robust approach.
*
* As can be seen from the above, for portability it's best to avoid
* calling g_atexit() (or atexit()) except in the main executable of a
* program.
*
* Deprecated:2.32: It is best to avoid g_atexit().
*/
void
g_atexit (GVoidFunc func)
{
gint result;
result = atexit ((void (*)(void)) func);
if (result)
{
g_error ("Could not register atexit() function: %s",
g_strerror (errno));
}
}
/* Based on execvp() from GNU Libc.
* Some of this code is cut-and-pasted into gspawn.c
*/
static gchar*
my_strchrnul (const gchar *str,
gchar c)
{
gchar *p = (gchar*)str;
while (*p && (*p != c))
++p;
return p;
}
#ifdef G_OS_WIN32
static gchar *inner_find_program_in_path (const gchar *program);
gchar*
g_find_program_in_path (const gchar *program)
{
const gchar *last_dot = strrchr (program, '.');
if (last_dot == NULL ||
strchr (last_dot, '\\') != NULL ||
strchr (last_dot, '/') != NULL)
{
const gint program_length = strlen (program);
gchar *pathext = g_build_path (";",
".exe;.cmd;.bat;.com",
g_getenv ("PATHEXT"),
NULL);
gchar *p;
gchar *decorated_program;
gchar *retval;
p = pathext;
do
{
gchar *q = my_strchrnul (p, ';');
decorated_program = g_malloc (program_length + (q-p) + 1);
memcpy (decorated_program, program, program_length);
memcpy (decorated_program+program_length, p, q-p);
decorated_program [program_length + (q-p)] = '\0';
retval = inner_find_program_in_path (decorated_program);
g_free (decorated_program);
if (retval != NULL)
{
g_free (pathext);
return retval;
}
p = q;
} while (*p++ != '\0');
g_free (pathext);
return NULL;
}
else
return inner_find_program_in_path (program);
}
#endif
/**
* g_find_program_in_path:
* @program: a program name in the GLib file name encoding
*
* Locates the first executable named @program in the user's path, in the
* same way that execvp() would locate it. Returns an allocated string
* with the absolute path name, or %NULL if the program is not found in
* the path. If @program is already an absolute path, returns a copy of
* @program if @program exists and is executable, and %NULL otherwise.
*
* On Windows, if @program does not have a file type suffix, tries
* with the suffixes .exe, .cmd, .bat and .com, and the suffixes in
* the `PATHEXT` environment variable.
*
* On Windows, it looks for the file in the same way as CreateProcess()
* would. This means first in the directory where the executing
* program was loaded from, then in the current directory, then in the
* Windows 32-bit system directory, then in the Windows directory, and
* finally in the directories in the `PATH` environment variable. If
* the program is found, the return value contains the full name
* including the type suffix.
*
* Returns: a newly-allocated string with the absolute path, or %NULL
**/
#ifdef G_OS_WIN32
static gchar *
inner_find_program_in_path (const gchar *program)
#else
gchar*
g_find_program_in_path (const gchar *program)
#endif
{
const gchar *path, *p;
gchar *name, *freeme;
#ifdef G_OS_WIN32
const gchar *path_copy;
gchar *filename = NULL, *appdir = NULL;
gchar *sysdir = NULL, *windir = NULL;
int n;
wchar_t wfilename[MAXPATHLEN], wsysdir[MAXPATHLEN],
wwindir[MAXPATHLEN];
#endif
gsize len;
gsize pathlen;
g_return_val_if_fail (program != NULL, NULL);
/* If it is an absolute path, or a relative path including subdirectories,
* don't look in PATH.
*/
if (g_path_is_absolute (program)
|| strchr (program, G_DIR_SEPARATOR) != NULL
#ifdef G_OS_WIN32
|| strchr (program, '/') != NULL
#endif
)
{
if (g_file_test (program, G_FILE_TEST_IS_EXECUTABLE) &&
!g_file_test (program, G_FILE_TEST_IS_DIR))
return g_strdup (program);
else
return NULL;
}
path = g_getenv ("PATH");
#if defined(G_OS_UNIX)
if (path == NULL)
{
/* There is no 'PATH' in the environment. The default
* search path in GNU libc is the current directory followed by
* the path 'confstr' returns for '_CS_PATH'.
*/
/* In GLib we put . last, for security, and don't use the
* unportable confstr(); UNIX98 does not actually specify
* what to search if PATH is unset. POSIX may, dunno.
*/
path = "/bin:/usr/bin:.";
}
#else
n = GetModuleFileNameW (NULL, wfilename, MAXPATHLEN);
if (n > 0 && n < MAXPATHLEN)
filename = g_utf16_to_utf8 (wfilename, -1, NULL, NULL, NULL);
n = GetSystemDirectoryW (wsysdir, MAXPATHLEN);
if (n > 0 && n < MAXPATHLEN)
sysdir = g_utf16_to_utf8 (wsysdir, -1, NULL, NULL, NULL);
n = GetWindowsDirectoryW (wwindir, MAXPATHLEN);
if (n > 0 && n < MAXPATHLEN)
windir = g_utf16_to_utf8 (wwindir, -1, NULL, NULL, NULL);
if (filename)
{
appdir = g_path_get_dirname (filename);
g_free (filename);
}
path = g_strdup (path);
if (windir)
{
const gchar *tem = path;
path = g_strconcat (windir, ";", path, NULL);
g_free ((gchar *) tem);
g_free (windir);
}
if (sysdir)
{
const gchar *tem = path;
path = g_strconcat (sysdir, ";", path, NULL);
g_free ((gchar *) tem);
g_free (sysdir);
}
{
const gchar *tem = path;
path = g_strconcat (".;", path, NULL);
g_free ((gchar *) tem);
}
if (appdir)
{
const gchar *tem = path;
path = g_strconcat (appdir, ";", path, NULL);
g_free ((gchar *) tem);
g_free (appdir);
}
path_copy = path;
#endif
len = strlen (program) + 1;
pathlen = strlen (path);
freeme = name = g_malloc (pathlen + len + 1);
/* Copy the file name at the top, including '\0' */
memcpy (name + pathlen + 1, program, len);
name = name + pathlen;
/* And add the slash before the filename */
*name = G_DIR_SEPARATOR;
p = path;
do
{
char *startp;
path = p;
p = my_strchrnul (path, G_SEARCHPATH_SEPARATOR);
if (p == path)
/* Two adjacent colons, or a colon at the beginning or the end
* of 'PATH' means to search the current directory.
*/
startp = name + 1;
else
startp = memcpy (name - (p - path), path, p - path);
if (g_file_test (startp, G_FILE_TEST_IS_EXECUTABLE) &&
!g_file_test (startp, G_FILE_TEST_IS_DIR))
{
gchar *ret;
ret = g_strdup (startp);
g_free (freeme);
#ifdef G_OS_WIN32
g_free ((gchar *) path_copy);
#endif
return ret;
}
}
while (*p++ != '\0');
g_free (freeme);
#ifdef G_OS_WIN32
g_free ((gchar *) path_copy);
#endif
return NULL;
}
/**
* g_bit_nth_lsf:
* @mask: a #gulong containing flags
* @nth_bit: the index of the bit to start the search from
*
* Find the position of the first bit set in @mask, searching
* from (but not including) @nth_bit upwards. Bits are numbered
* from 0 (least significant) to sizeof(#gulong) * 8 - 1 (31 or 63,
* usually). To start searching from the 0th bit, set @nth_bit to -1.
*
* Returns: the index of the first bit set which is higher than @nth_bit, or -1
* if no higher bits are set
*/
/**
* g_bit_nth_msf:
* @mask: a #gulong containing flags
* @nth_bit: the index of the bit to start the search from
*
* Find the position of the first bit set in @mask, searching
* from (but not including) @nth_bit downwards. Bits are numbered
* from 0 (least significant) to sizeof(#gulong) * 8 - 1 (31 or 63,
* usually). To start searching from the last bit, set @nth_bit to
* -1 or GLIB_SIZEOF_LONG * 8.
*
* Returns: the index of the first bit set which is lower than @nth_bit, or -1
* if no lower bits are set
*/
/**
* g_bit_storage:
* @number: a #guint
*
* Gets the number of bits used to hold @number,
* e.g. if @number is 4, 3 bits are needed.
*
* Returns: the number of bits used to hold @number
*/
G_LOCK_DEFINE_STATIC (g_utils_global);
typedef struct
{
gchar *user_name;
gchar *real_name;
gchar *home_dir;
} UserDatabaseEntry;
static gchar *g_user_data_dir = NULL;
static gchar **g_system_data_dirs = NULL;
static gchar *g_user_cache_dir = NULL;
static gchar *g_user_config_dir = NULL;
static gchar **g_system_config_dirs = NULL;
static gchar **g_user_special_dirs = NULL;
/* fifteen minutes of fame for everybody */
#define G_USER_DIRS_EXPIRE 15 * 60
#ifdef G_OS_WIN32
static gchar *
get_special_folder (int csidl)
{
wchar_t path[MAX_PATH+1];
HRESULT hr;
LPITEMIDLIST pidl = NULL;
BOOL b;
gchar *retval = NULL;
hr = SHGetSpecialFolderLocation (NULL, csidl, &pidl);
if (hr == S_OK)
{
b = SHGetPathFromIDListW (pidl, path);
if (b)
retval = g_utf16_to_utf8 (path, -1, NULL, NULL, NULL);
CoTaskMemFree (pidl);
}
return retval;
}
static char *
get_windows_directory_root (void)
{
wchar_t wwindowsdir[MAX_PATH];
if (GetWindowsDirectoryW (wwindowsdir, G_N_ELEMENTS (wwindowsdir)))
{
/* Usually X:\Windows, but in terminal server environments
* might be an UNC path, AFAIK.
*/
char *windowsdir = g_utf16_to_utf8 (wwindowsdir, -1, NULL, NULL, NULL);
char *p;
if (windowsdir == NULL)
return g_strdup ("C:\\");
p = (char *) g_path_skip_root (windowsdir);
if (G_IS_DIR_SEPARATOR (p[-1]) && p[-2] != ':')
p--;
*p = '\0';
return windowsdir;
}
else
return g_strdup ("C:\\");
}
#endif
/* HOLDS: g_utils_global_lock */
static UserDatabaseEntry *
g_get_user_database_entry (void)
{
static UserDatabaseEntry *entry;
if (g_once_init_enter (&entry))
{
static UserDatabaseEntry e;
#ifdef G_OS_UNIX
{
struct passwd *pw = NULL;
gpointer buffer = NULL;
gint error;
gchar *logname;
# if defined (HAVE_POSIX_GETPWUID_R) || defined (HAVE_NONPOSIX_GETPWUID_R)
struct passwd pwd;
# ifdef _SC_GETPW_R_SIZE_MAX
/* This reurns the maximum length */
glong bufsize = sysconf (_SC_GETPW_R_SIZE_MAX);
if (bufsize < 0)
bufsize = 64;
# else /* _SC_GETPW_R_SIZE_MAX */
glong bufsize = 64;
# endif /* _SC_GETPW_R_SIZE_MAX */
logname = (gchar *) g_getenv ("LOGNAME");
do
{
g_free (buffer);
/* we allocate 6 extra bytes to work around a bug in
* Mac OS < 10.3. See #156446
*/
buffer = g_malloc (bufsize + 6);
errno = 0;
# ifdef HAVE_POSIX_GETPWUID_R
if (logname) {
error = getpwnam_r (logname, &pwd, buffer, bufsize, &pw);
if (!pw || (pw->pw_uid != getuid ())) {
/* LOGNAME is lying, fall back to looking up the uid */
error = getpwuid_r (getuid (), &pwd, buffer, bufsize, &pw);
}
} else {
error = getpwuid_r (getuid (), &pwd, buffer, bufsize, &pw);
}
error = error < 0 ? errno : error;
# else /* HAVE_NONPOSIX_GETPWUID_R */
# if defined(_AIX)
error = getpwuid_r (getuid (), &pwd, buffer, bufsize);
pw = error == 0 ? &pwd : NULL;
# else /* !_AIX */
if (logname) {
pw = getpwnam_r (logname, &pwd, buffer, bufsize);
if (!pw || (pw->pw_uid != getuid ())) {
/* LOGNAME is lying, fall back to looking up the uid */
pw = getpwuid_r (getuid (), &pwd, buffer, bufsize);
}
} else {
pw = getpwuid_r (getuid (), &pwd, buffer, bufsize);
}
error = pw ? 0 : errno;
# endif /* !_AIX */
# endif /* HAVE_NONPOSIX_GETPWUID_R */
if (!pw)
{
/* we bail out prematurely if the user id can't be found
* (should be pretty rare case actually), or if the buffer
* should be sufficiently big and lookups are still not
* successful.
*/
if (error == 0 || error == ENOENT)
{
g_warning ("getpwuid_r(): failed due to unknown user id (%lu)",
(gulong) getuid ());
break;
}
if (bufsize > 32 * 1024)
{
g_warning ("getpwuid_r(): failed due to: %s.",
g_strerror (error));
break;
}
bufsize *= 2;
}
}
while (!pw);
# endif /* HAVE_POSIX_GETPWUID_R || HAVE_NONPOSIX_GETPWUID_R */
if (!pw)
{
pw = getpwuid (getuid ());
}
if (pw)
{
e.user_name = g_strdup (pw->pw_name);
#ifndef __BIONIC__
if (pw->pw_gecos && *pw->pw_gecos != '\0')
{
gchar **gecos_fields;
gchar **name_parts;
/* split the gecos field and substitute '&' */
gecos_fields = g_strsplit (pw->pw_gecos, ",", 0);
name_parts = g_strsplit (gecos_fields[0], "&", 0);
pw->pw_name[0] = g_ascii_toupper (pw->pw_name[0]);
e.real_name = g_strjoinv (pw->pw_name, name_parts);
g_strfreev (gecos_fields);
g_strfreev (name_parts);
}
#endif
if (!e.home_dir)
e.home_dir = g_strdup (pw->pw_dir);
}
g_free (buffer);
}
#endif /* G_OS_UNIX */
#ifdef G_OS_WIN32
{
guint len = UNLEN+1;
wchar_t buffer[UNLEN+1];
if (GetUserNameW (buffer, (LPDWORD) &len))
{
e.user_name = g_utf16_to_utf8 (buffer, -1, NULL, NULL, NULL);
e.real_name = g_strdup (e.user_name);
}
}
#endif /* G_OS_WIN32 */
if (!e.user_name)
e.user_name = g_strdup ("somebody");
if (!e.real_name)
e.real_name = g_strdup ("Unknown");
g_once_init_leave (&entry, &e);
}
return entry;
}
/**
* g_get_user_name:
*
* Gets the user name of the current user. The encoding of the returned
* string is system-defined. On UNIX, it might be the preferred file name
* encoding, or something else, and there is no guarantee that it is even
* consistent on a machine. On Windows, it is always UTF-8.
*
* Returns: the user name of the current user.
*/
const gchar *
g_get_user_name (void)
{
UserDatabaseEntry *entry;
entry = g_get_user_database_entry ();
return entry->user_name;
}
/**
* g_get_real_name:
*
* Gets the real name of the user. This usually comes from the user's
* entry in the `passwd` file. The encoding of the returned string is
* system-defined. (On Windows, it is, however, always UTF-8.) If the
* real user name cannot be determined, the string "Unknown" is
* returned.
*
* Returns: the user's real name.
*/
const gchar *
g_get_real_name (void)
{
UserDatabaseEntry *entry;
entry = g_get_user_database_entry ();
return entry->real_name;
}
/**
* g_get_home_dir:
*
* Gets the current user's home directory.
*
* As with most UNIX tools, this function will return the value of the
* `HOME` environment variable if it is set to an existing absolute path
* name, falling back to the `passwd` file in the case that it is unset.
*
* If the path given in `HOME` is non-absolute, does not exist, or is
* not a directory, the result is undefined.
*
* Before version 2.36 this function would ignore the `HOME` environment
* variable, taking the value from the `passwd` database instead. This was
* changed to increase the compatibility of GLib with other programs (and
* the XDG basedir specification) and to increase testability of programs
* based on GLib (by making it easier to run them from test frameworks).
*
* If your program has a strong requirement for either the new or the
* old behaviour (and if you don't wish to increase your GLib
* dependency to ensure that the new behaviour is in effect) then you
* should either directly check the `HOME` environment variable yourself
* or unset it before calling any functions in GLib.
*
* Returns: the current user's home directory
*/
const gchar *
g_get_home_dir (void)
{
static gchar *home_dir;
if (g_once_init_enter (&home_dir))
{
gchar *tmp;
/* We first check HOME and use it if it is set */
tmp = g_strdup (g_getenv ("HOME"));
#ifdef G_OS_WIN32
/* Only believe HOME if it is an absolute path and exists.
*
* We only do this check on Windows for a couple of reasons.
* Historically, we only did it there because we used to ignore $HOME
* on UNIX. There are concerns about enabling it now on UNIX because
* of things like autofs. In short, if the user has a bogus value in
* $HOME then they get what they pay for...
*/
if (tmp)
{
if (!(g_path_is_absolute (tmp) &&
g_file_test (tmp, G_FILE_TEST_IS_DIR)))
{
g_free (tmp);
tmp = NULL;
}
}
/* In case HOME is Unix-style (it happens), convert it to
* Windows style.
*/
if (tmp)
{
gchar *p;
while ((p = strchr (tmp, '/')) != NULL)
*p = '\\';
}
if (!tmp)
{
/* USERPROFILE is probably the closest equivalent to $HOME? */
if (g_getenv ("USERPROFILE") != NULL)
tmp = g_strdup (g_getenv ("USERPROFILE"));
}
if (!tmp)
tmp = get_special_folder (CSIDL_PROFILE);
if (!tmp)
tmp = get_windows_directory_root ();
#endif /* G_OS_WIN32 */
if (!tmp)
{
/* If we didn't get it from any of those methods, we will have
* to read the user database entry.
*/
UserDatabaseEntry *entry;
entry = g_get_user_database_entry ();
/* Strictly speaking, we should copy this, but we know that
* neither will ever be freed, so don't bother...
*/
tmp = entry->home_dir;
}
g_once_init_leave (&home_dir, tmp);
}
return home_dir;
}
/**
* g_get_tmp_dir:
*
* Gets the directory to use for temporary files.
*
* On UNIX, this is taken from the `TMPDIR` environment variable.
* If the variable is not set, `P_tmpdir` is
* used, as defined by the system C library. Failing that, a
* hard-coded default of "/tmp" is returned.
*
* On Windows, the `TEMP` environment variable is used, with the
* root directory of the Windows installation (eg: "C:\") used
* as a default.
*
* The encoding of the returned string is system-defined. On Windows,
* it is always UTF-8. The return value is never %NULL or the empty
* string.
*
* Returns: the directory to use for temporary files.
*/
const gchar *
g_get_tmp_dir (void)
{
static gchar *tmp_dir;
if (g_once_init_enter (&tmp_dir))
{
gchar *tmp;
#ifdef G_OS_WIN32
tmp = g_strdup (g_getenv ("TEMP"));
if (tmp == NULL || *tmp == '\0')
{
g_free (tmp);
tmp = get_windows_directory_root ();
}
#else /* G_OS_WIN32 */
tmp = g_strdup (g_getenv ("TMPDIR"));
#ifdef P_tmpdir
if (tmp == NULL || *tmp == '\0')
{
gsize k;
g_free (tmp);
tmp = g_strdup (P_tmpdir);
k = strlen (tmp);
if (k > 1 && G_IS_DIR_SEPARATOR (tmp[k - 1]))
tmp[k - 1] = '\0';
}
#endif /* P_tmpdir */
if (tmp == NULL || *tmp == '\0')
{
g_free (tmp);
tmp = g_strdup ("/tmp");
}
#endif /* !G_OS_WIN32 */
g_once_init_leave (&tmp_dir, tmp);
}
return tmp_dir;
}
/**
* g_get_host_name:
*
* Return a name for the machine.
*
* The returned name is not necessarily a fully-qualified domain name,
* or even present in DNS or some other name service at all. It need
* not even be unique on your local network or site, but usually it
* is. Callers should not rely on the return value having any specific
* properties like uniqueness for security purposes. Even if the name
* of the machine is changed while an application is running, the
* return value from this function does not change. The returned
* string is owned by GLib and should not be modified or freed. If no
* name can be determined, a default fixed string "localhost" is
* returned.
*
* Returns: the host name of the machine.
*
* Since: 2.8
*/
const gchar *
g_get_host_name (void)
{
static gchar *hostname;
if (g_once_init_enter (&hostname))
{
gboolean failed;
gchar tmp[100];
#ifndef G_OS_WIN32
failed = (gethostname (tmp, sizeof (tmp)) == -1);
#else
DWORD size = sizeof (tmp);
failed = (!GetComputerName (tmp, &size));
#endif
g_once_init_leave (&hostname, g_strdup (failed ? "localhost" : tmp));
}
return hostname;
}
G_LOCK_DEFINE_STATIC (g_prgname);
static gchar *g_prgname = NULL;
/**
* g_get_prgname:
*
* Gets the name of the program. This name should not be localized,
* in contrast to g_get_application_name().
*
* If you are using GDK or GTK+ the program name is set in gdk_init(),
* which is called by gtk_init(). The program name is found by taking
* the last component of @argv[0].
*
* Returns: the name of the program. The returned string belongs
* to GLib and must not be modified or freed.
*/
const gchar*
g_get_prgname (void)
{
gchar* retval;
G_LOCK (g_prgname);
#ifdef G_OS_WIN32
if (g_prgname == NULL)
{
static gboolean beenhere = FALSE;
if (!beenhere)
{
gchar *utf8_buf = NULL;
wchar_t buf[MAX_PATH+1];
beenhere = TRUE;
if (GetModuleFileNameW (GetModuleHandle (NULL),
buf, G_N_ELEMENTS (buf)) > 0)
utf8_buf = g_utf16_to_utf8 (buf, -1, NULL, NULL, NULL);
if (utf8_buf)
{
g_prgname = g_path_get_basename (utf8_buf);
g_free (utf8_buf);
}
}
}
#endif
retval = g_prgname;
G_UNLOCK (g_prgname);
return retval;
}
/**
* g_set_prgname:
* @prgname: the name of the program.
*
* Sets the name of the program. This name should not be localized,
* in contrast to g_set_application_name().
*
* Note that for thread-safety reasons this function can only be called once.
*/
void
g_set_prgname (const gchar *prgname)
{
G_LOCK (g_prgname);
g_free (g_prgname);
g_prgname = g_strdup (prgname);
G_UNLOCK (g_prgname);
}
G_LOCK_DEFINE_STATIC (g_application_name);
static gchar *g_application_name = NULL;
/**
* g_get_application_name:
*
* Gets a human-readable name for the application, as set by
* g_set_application_name(). This name should be localized if
* possible, and is intended for display to the user. Contrast with
* g_get_prgname(), which gets a non-localized name. If
* g_set_application_name() has not been called, returns the result of
* g_get_prgname() (which may be %NULL if g_set_prgname() has also not
* been called).
*
* Returns: human-readable application name. may return %NULL
*
* Since: 2.2
**/
const gchar *
g_get_application_name (void)
{
gchar* retval;
G_LOCK (g_application_name);
retval = g_application_name;
G_UNLOCK (g_application_name);
if (retval == NULL)
return g_get_prgname ();
return retval;
}
/**
* g_set_application_name:
* @application_name: localized name of the application
*
* Sets a human-readable name for the application. This name should be
* localized if possible, and is intended for display to the user.
* Contrast with g_set_prgname(), which sets a non-localized name.
* g_set_prgname() will be called automatically by gtk_init(),
* but g_set_application_name() will not.
*
* Note that for thread safety reasons, this function can only
* be called once.
*
* The application name will be used in contexts such as error messages,
* or when displaying an application's name in the task list.
*
* Since: 2.2
**/
void
g_set_application_name (const gchar *application_name)
{
gboolean already_set = FALSE;
G_LOCK (g_application_name);
if (g_application_name)
already_set = TRUE;
else
g_application_name = g_strdup (application_name);
G_UNLOCK (g_application_name);
if (already_set)
g_warning ("g_set_application_name() called multiple times");
}
/**
* g_get_user_data_dir:
*
* Returns a base directory in which to access application data such
* as icons that is customized for a particular user.
*
* On UNIX platforms this is determined using the mechanisms described
* in the
* [XDG Base Directory Specification](http://www.freedesktop.org/Standards/basedir-spec).
* In this case the directory retrieved will be `XDG_DATA_HOME`.
*
* On Windows this is the folder to use for local (as opposed to
* roaming) application data. See documentation for
* CSIDL_LOCAL_APPDATA. Note that on Windows it thus is the same as
* what g_get_user_config_dir() returns.
*
* Returns: a string owned by GLib that must not be modified
* or freed.
* Since: 2.6
**/
const gchar *
g_get_user_data_dir (void)
{
gchar *data_dir;
G_LOCK (g_utils_global);
if (!g_user_data_dir)
{
#ifdef G_OS_WIN32
data_dir = get_special_folder (CSIDL_LOCAL_APPDATA);
#else
data_dir = (gchar *) g_getenv ("XDG_DATA_HOME");
if (data_dir && data_dir[0])
data_dir = g_strdup (data_dir);
#endif
if (!data_dir || !data_dir[0])
{
const gchar *home_dir = g_get_home_dir ();
if (home_dir)
data_dir = g_build_filename (home_dir, ".local", "share", NULL);
else
data_dir = g_build_filename (g_get_tmp_dir (), g_get_user_name (), ".local", "share", NULL);
}
g_user_data_dir = data_dir;
}
else
data_dir = g_user_data_dir;
G_UNLOCK (g_utils_global);
return data_dir;
}
static void
g_init_user_config_dir (void)
{
gchar *config_dir;
if (!g_user_config_dir)
{
#ifdef G_OS_WIN32
config_dir = get_special_folder (CSIDL_LOCAL_APPDATA);
#else
config_dir = (gchar *) g_getenv ("XDG_CONFIG_HOME");
if (config_dir && config_dir[0])
config_dir = g_strdup (config_dir);
#endif
if (!config_dir || !config_dir[0])
{
const gchar *home_dir = g_get_home_dir ();
if (home_dir)
config_dir = g_build_filename (home_dir, ".config", NULL);
else
config_dir = g_build_filename (g_get_tmp_dir (), g_get_user_name (), ".config", NULL);
}
g_user_config_dir = config_dir;
}
}
/**
* g_get_user_config_dir:
*
* Returns a base directory in which to store user-specific application
* configuration information such as user preferences and settings.
*
* On UNIX platforms this is determined using the mechanisms described
* in the
* [XDG Base Directory Specification](http://www.freedesktop.org/Standards/basedir-spec).
* In this case the directory retrieved will be `XDG_CONFIG_HOME`.
*
* On Windows this is the folder to use for local (as opposed to
* roaming) application data. See documentation for
* CSIDL_LOCAL_APPDATA. Note that on Windows it thus is the same as
* what g_get_user_data_dir() returns.
*
* Returns: a string owned by GLib that must not be modified
* or freed.
* Since: 2.6
**/
const gchar *
g_get_user_config_dir (void)
{
G_LOCK (g_utils_global);
g_init_user_config_dir ();
G_UNLOCK (g_utils_global);
return g_user_config_dir;
}
/**
* g_get_user_cache_dir:
*
* Returns a base directory in which to store non-essential, cached
* data specific to particular user.
*
* On UNIX platforms this is determined using the mechanisms described
* in the
* [XDG Base Directory Specification](http://www.freedesktop.org/Standards/basedir-spec).
* In this case the directory retrieved will be XDG_CACHE_HOME.
*
* On Windows is the directory that serves as a common repository for
* temporary Internet files. A typical path is
* C:\Documents and Settings\username\Local Settings\Temporary Internet Files.
* See documentation for CSIDL_INTERNET_CACHE.
*
* Returns: a string owned by GLib that must not be modified
* or freed.
* Since: 2.6
**/
const gchar *
g_get_user_cache_dir (void)
{
gchar *cache_dir;
G_LOCK (g_utils_global);
if (!g_user_cache_dir)
{
#ifdef G_OS_WIN32
cache_dir = get_special_folder (CSIDL_INTERNET_CACHE); /* XXX correct? */
#else
cache_dir = (gchar *) g_getenv ("XDG_CACHE_HOME");
if (cache_dir && cache_dir[0])
cache_dir = g_strdup (cache_dir);
#endif
if (!cache_dir || !cache_dir[0])
{
const gchar *home_dir = g_get_home_dir ();
if (home_dir)
cache_dir = g_build_filename (home_dir, ".cache", NULL);
else
cache_dir = g_build_filename (g_get_tmp_dir (), g_get_user_name (), ".cache", NULL);
}
g_user_cache_dir = cache_dir;
}
else
cache_dir = g_user_cache_dir;
G_UNLOCK (g_utils_global);
return cache_dir;
}
/**
* g_get_user_runtime_dir:
*
* Returns a directory that is unique to the current user on the local
* system.
*
* On UNIX platforms this is determined using the mechanisms described
* in the
* [XDG Base Directory Specification](http://www.freedesktop.org/Standards/basedir-spec).
* This is the directory
* specified in the `XDG_RUNTIME_DIR` environment variable.
* In the case that this variable is not set, GLib will issue a warning
* message to stderr and return the value of g_get_user_cache_dir().
*
* On Windows this is the folder to use for local (as opposed to
* roaming) application data. See documentation for
* CSIDL_LOCAL_APPDATA. Note that on Windows it thus is the same as
* what g_get_user_config_dir() returns.
*
* Returns: a string owned by GLib that must not be modified or freed.
*
* Since: 2.28
**/
const gchar *
g_get_user_runtime_dir (void)
{
#ifndef G_OS_WIN32
static const gchar *runtime_dir;
static gsize initialised;
if (g_once_init_enter (&initialised))
{
runtime_dir = g_strdup (getenv ("XDG_RUNTIME_DIR"));
g_once_init_leave (&initialised, 1);
}
if (runtime_dir)
return runtime_dir;
/* Both fallback for UNIX and the default
* in Windows: use the user cache directory.
*/
#endif
return g_get_user_cache_dir ();
}
#ifdef HAVE_CARBON
static gchar *
find_folder (OSType type)
{
gchar *filename = NULL;
FSRef found;
if (FSFindFolder (kUserDomain, type, kDontCreateFolder, &found) == noErr)
{
CFURLRef url = CFURLCreateFromFSRef (kCFAllocatorSystemDefault, &found);
if (url)
{
CFStringRef path = CFURLCopyFileSystemPath (url, kCFURLPOSIXPathStyle);
if (path)
{
filename = g_strdup (CFStringGetCStringPtr (path, kCFStringEncodingUTF8));
if (! filename)
{
filename = g_new0 (gchar, CFStringGetLength (path) * 3 + 1);
CFStringGetCString (path, filename,
CFStringGetLength (path) * 3 + 1,
kCFStringEncodingUTF8);
}
CFRelease (path);
}
CFRelease (url);
}
}
return filename;
}
static void
load_user_special_dirs (void)
{
g_user_special_dirs[G_USER_DIRECTORY_DESKTOP] = find_folder (kDesktopFolderType);
g_user_special_dirs[G_USER_DIRECTORY_DOCUMENTS] = find_folder (kDocumentsFolderType);
g_user_special_dirs[G_USER_DIRECTORY_DOWNLOAD] = find_folder (kDesktopFolderType); /* XXX correct ? */
g_user_special_dirs[G_USER_DIRECTORY_MUSIC] = find_folder (kMusicDocumentsFolderType);
g_user_special_dirs[G_USER_DIRECTORY_PICTURES] = find_folder (kPictureDocumentsFolderType);
g_user_special_dirs[G_USER_DIRECTORY_PUBLIC_SHARE] = NULL;
g_user_special_dirs[G_USER_DIRECTORY_TEMPLATES] = NULL;
g_user_special_dirs[G_USER_DIRECTORY_VIDEOS] = find_folder (kMovieDocumentsFolderType);
}
#elif defined(G_OS_WIN32)
static void
load_user_special_dirs (void)
{
typedef HRESULT (WINAPI *t_SHGetKnownFolderPath) (const GUID *rfid,
DWORD dwFlags,
HANDLE hToken,
PWSTR *ppszPath);
t_SHGetKnownFolderPath p_SHGetKnownFolderPath;
static const GUID FOLDERID_Downloads =
{ 0x374de290, 0x123f, 0x4565, { 0x91, 0x64, 0x39, 0xc4, 0x92, 0x5e, 0x46, 0x7b } };
static const GUID FOLDERID_Public =
{ 0xDFDF76A2, 0xC82A, 0x4D63, { 0x90, 0x6A, 0x56, 0x44, 0xAC, 0x45, 0x73, 0x85 } };
wchar_t *wcp;
p_SHGetKnownFolderPath = (t_SHGetKnownFolderPath) GetProcAddress (GetModuleHandle ("shell32.dll"),
"SHGetKnownFolderPath");
g_user_special_dirs[G_USER_DIRECTORY_DESKTOP] = get_special_folder (CSIDL_DESKTOPDIRECTORY);
g_user_special_dirs[G_USER_DIRECTORY_DOCUMENTS] = get_special_folder (CSIDL_PERSONAL);
if (p_SHGetKnownFolderPath == NULL)
{
g_user_special_dirs[G_USER_DIRECTORY_DOWNLOAD] = get_special_folder (CSIDL_DESKTOPDIRECTORY);
}
else
{
wcp = NULL;
(*p_SHGetKnownFolderPath) (&FOLDERID_Downloads, 0, NULL, &wcp);
if (wcp)
{
g_user_special_dirs[G_USER_DIRECTORY_DOWNLOAD] = g_utf16_to_utf8 (wcp, -1, NULL, NULL, NULL);
if (g_user_special_dirs[G_USER_DIRECTORY_DOWNLOAD] == NULL)
g_user_special_dirs[G_USER_DIRECTORY_DOWNLOAD] = get_special_folder (CSIDL_DESKTOPDIRECTORY);
CoTaskMemFree (wcp);
}
else
g_user_special_dirs[G_USER_DIRECTORY_DOWNLOAD] = get_special_folder (CSIDL_DESKTOPDIRECTORY);
}
g_user_special_dirs[G_USER_DIRECTORY_MUSIC] = get_special_folder (CSIDL_MYMUSIC);
g_user_special_dirs[G_USER_DIRECTORY_PICTURES] = get_special_folder (CSIDL_MYPICTURES);
if (p_SHGetKnownFolderPath == NULL)
{
/* XXX */
g_user_special_dirs[G_USER_DIRECTORY_PUBLIC_SHARE] = get_special_folder (CSIDL_COMMON_DOCUMENTS);
}
else
{
wcp = NULL;
(*p_SHGetKnownFolderPath) (&FOLDERID_Public, 0, NULL, &wcp);
if (wcp)
{
g_user_special_dirs[G_USER_DIRECTORY_PUBLIC_SHARE] = g_utf16_to_utf8 (wcp, -1, NULL, NULL, NULL);
if (g_user_special_dirs[G_USER_DIRECTORY_PUBLIC_SHARE] == NULL)
g_user_special_dirs[G_USER_DIRECTORY_PUBLIC_SHARE] = get_special_folder (CSIDL_COMMON_DOCUMENTS);
CoTaskMemFree (wcp);
}
else
g_user_special_dirs[G_USER_DIRECTORY_PUBLIC_SHARE] = get_special_folder (CSIDL_COMMON_DOCUMENTS);
}
g_user_special_dirs[G_USER_DIRECTORY_TEMPLATES] = get_special_folder (CSIDL_TEMPLATES);
g_user_special_dirs[G_USER_DIRECTORY_VIDEOS] = get_special_folder (CSIDL_MYVIDEO);
}
#else /* default is unix */
/* adapted from xdg-user-dir-lookup.c
*
* Copyright (C) 2007 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
static void
load_user_special_dirs (void)
{
gchar *config_file;
gchar *data;
gchar **lines;
gint n_lines, i;
g_init_user_config_dir ();
config_file = g_build_filename (g_user_config_dir,
"user-dirs.dirs",
NULL);
if (!g_file_get_contents (config_file, &data, NULL, NULL))
{
g_free (config_file);
return;
}
lines = g_strsplit (data, "\n", -1);
n_lines = g_strv_length (lines);
g_free (data);
for (i = 0; i < n_lines; i++)
{
gchar *buffer = lines[i];
gchar *d, *p;
gint len;
gboolean is_relative = FALSE;
GUserDirectory directory;
/* Remove newline at end */
len = strlen (buffer);
if (len > 0 && buffer[len - 1] == '\n')
buffer[len - 1] = 0;
p = buffer;
while (*p == ' ' || *p == '\t')
p++;
if (strncmp (p, "XDG_DESKTOP_DIR", strlen ("XDG_DESKTOP_DIR")) == 0)
{
directory = G_USER_DIRECTORY_DESKTOP;
p += strlen ("XDG_DESKTOP_DIR");
}
else if (strncmp (p, "XDG_DOCUMENTS_DIR", strlen ("XDG_DOCUMENTS_DIR")) == 0)
{
directory = G_USER_DIRECTORY_DOCUMENTS;
p += strlen ("XDG_DOCUMENTS_DIR");
}
else if (strncmp (p, "XDG_DOWNLOAD_DIR", strlen ("XDG_DOWNLOAD_DIR")) == 0)
{
directory = G_USER_DIRECTORY_DOWNLOAD;
p += strlen ("XDG_DOWNLOAD_DIR");
}
else if (strncmp (p, "XDG_MUSIC_DIR", strlen ("XDG_MUSIC_DIR")) == 0)
{
directory = G_USER_DIRECTORY_MUSIC;
p += strlen ("XDG_MUSIC_DIR");
}
else if (strncmp (p, "XDG_PICTURES_DIR", strlen ("XDG_PICTURES_DIR")) == 0)
{
directory = G_USER_DIRECTORY_PICTURES;
p += strlen ("XDG_PICTURES_DIR");
}
else if (strncmp (p, "XDG_PUBLICSHARE_DIR", strlen ("XDG_PUBLICSHARE_DIR")) == 0)
{
directory = G_USER_DIRECTORY_PUBLIC_SHARE;
p += strlen ("XDG_PUBLICSHARE_DIR");
}
else if (strncmp (p, "XDG_TEMPLATES_DIR", strlen ("XDG_TEMPLATES_DIR")) == 0)
{
directory = G_USER_DIRECTORY_TEMPLATES;
p += strlen ("XDG_TEMPLATES_DIR");
}
else if (strncmp (p, "XDG_VIDEOS_DIR", strlen ("XDG_VIDEOS_DIR")) == 0)
{
directory = G_USER_DIRECTORY_VIDEOS;
p += strlen ("XDG_VIDEOS_DIR");
}
else
continue;
while (*p == ' ' || *p == '\t')
p++;
if (*p != '=')
continue;
p++;
while (*p == ' ' || *p == '\t')
p++;
if (*p != '"')
continue;
p++;
if (strncmp (p, "$HOME", 5) == 0)
{
p += 5;
is_relative = TRUE;
}
else if (*p != '/')
continue;
d = strrchr (p, '"');
if (!d)
continue;
*d = 0;
d = p;
/* remove trailing slashes */
len = strlen (d);
if (d[len - 1] == '/')
d[len - 1] = 0;
if (is_relative)
{
g_user_special_dirs[directory] = g_build_filename (g_get_home_dir (), d, NULL);
}
else
g_user_special_dirs[directory] = g_strdup (d);
}
g_strfreev (lines);
g_free (config_file);
}
#endif /* platform-specific load_user_special_dirs implementations */
/**
* g_reload_user_special_dirs_cache:
*
* Resets the cache used for g_get_user_special_dir(), so
* that the latest on-disk version is used. Call this only
* if you just changed the data on disk yourself.
*
* Due to threadsafety issues this may cause leaking of strings
* that were previously returned from g_get_user_special_dir()
* that can't be freed. We ensure to only leak the data for
* the directories that actually changed value though.
*
* Since: 2.22
*/
void
g_reload_user_special_dirs_cache (void)
{
int i;
G_LOCK (g_utils_global);
if (g_user_special_dirs != NULL)
{
/* save a copy of the pointer, to check if some memory can be preserved */
char **old_g_user_special_dirs = g_user_special_dirs;
char *old_val;
/* recreate and reload our cache */
g_user_special_dirs = g_new0 (gchar *, G_USER_N_DIRECTORIES);
load_user_special_dirs ();
/* only leak changed directories */
for (i = 0; i < G_USER_N_DIRECTORIES; i++)
{
old_val = old_g_user_special_dirs[i];
if (g_user_special_dirs[i] == NULL)
{
g_user_special_dirs[i] = old_val;
}
else if (g_strcmp0 (old_val, g_user_special_dirs[i]) == 0)
{
/* don't leak */
g_free (g_user_special_dirs[i]);
g_user_special_dirs[i] = old_val;
}
else
g_free (old_val);
}
/* free the old array */
g_free (old_g_user_special_dirs);
}
G_UNLOCK (g_utils_global);
}
/**
* g_get_user_special_dir:
* @directory: the logical id of special directory
*
* Returns the full path of a special directory using its logical id.
*
* On UNIX this is done using the XDG special user directories.
* For compatibility with existing practise, %G_USER_DIRECTORY_DESKTOP
* falls back to `$HOME/Desktop` when XDG special user directories have
* not been set up.
*
* Depending on the platform, the user might be able to change the path
* of the special directory without requiring the session to restart; GLib
* will not reflect any change once the special directories are loaded.
*
* Returns: the path to the specified special directory, or %NULL
* if the logical id was not found. The returned string is owned by
* GLib and should not be modified or freed.
*
* Since: 2.14
*/
const gchar *
g_get_user_special_dir (GUserDirectory directory)
{
g_return_val_if_fail (directory >= G_USER_DIRECTORY_DESKTOP &&
directory < G_USER_N_DIRECTORIES, NULL);
G_LOCK (g_utils_global);
if (G_UNLIKELY (g_user_special_dirs == NULL))
{
g_user_special_dirs = g_new0 (gchar *, G_USER_N_DIRECTORIES);
load_user_special_dirs ();
/* Special-case desktop for historical compatibility */
if (g_user_special_dirs[G_USER_DIRECTORY_DESKTOP] == NULL)
g_user_special_dirs[G_USER_DIRECTORY_DESKTOP] = g_build_filename (g_get_home_dir (), "Desktop", NULL);
}
G_UNLOCK (g_utils_global);
return g_user_special_dirs[directory];
}
#ifdef G_OS_WIN32
#undef g_get_system_data_dirs
static HMODULE
get_module_for_address (gconstpointer address)
{
/* Holds the g_utils_global lock */
static gboolean beenhere = FALSE;
typedef BOOL (WINAPI *t_GetModuleHandleExA) (DWORD, LPCTSTR, HMODULE *);
static t_GetModuleHandleExA p_GetModuleHandleExA = NULL;
HMODULE hmodule = NULL;
if (!address)
return NULL;
if (!beenhere)
{
p_GetModuleHandleExA =
(t_GetModuleHandleExA) GetProcAddress (GetModuleHandle ("kernel32.dll"),
"GetModuleHandleExA");
beenhere = TRUE;
}
if (p_GetModuleHandleExA == NULL ||
!(*p_GetModuleHandleExA) (GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT |
GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
address, &hmodule))
{
MEMORY_BASIC_INFORMATION mbi;
VirtualQuery (address, &mbi, sizeof (mbi));
hmodule = (HMODULE) mbi.AllocationBase;
}
return hmodule;
}
static gchar *
get_module_share_dir (gconstpointer address)
{
HMODULE hmodule;
gchar *filename;
gchar *retval;
hmodule = get_module_for_address (address);
if (hmodule == NULL)
return NULL;
filename = g_win32_get_package_installation_directory_of_module (hmodule);
retval = g_build_filename (filename, "share", NULL);
g_free (filename);
return retval;
}
const gchar * const *
g_win32_get_system_data_dirs_for_module (void (*address_of_function)(void))
{
GArray *data_dirs;
HMODULE hmodule;
static GHashTable *per_module_data_dirs = NULL;
gchar **retval;
gchar *p;
gchar *exe_root;
hmodule = NULL;
if (address_of_function)
{
G_LOCK (g_utils_global);
hmodule = get_module_for_address (address_of_function);
if (hmodule != NULL)
{
if (per_module_data_dirs == NULL)
per_module_data_dirs = g_hash_table_new (NULL, NULL);
else
{
retval = g_hash_table_lookup (per_module_data_dirs, hmodule);
if (retval != NULL)
{
G_UNLOCK (g_utils_global);
return (const gchar * const *) retval;
}
}
}
}
data_dirs = g_array_new (TRUE, TRUE, sizeof (char *));
/* Documents and Settings\All Users\Application Data */
p = get_special_folder (CSIDL_COMMON_APPDATA);
if (p)
g_array_append_val (data_dirs, p);
/* Documents and Settings\All Users\Documents */
p = get_special_folder (CSIDL_COMMON_DOCUMENTS);
if (p)
g_array_append_val (data_dirs, p);
/* Using the above subfolders of Documents and Settings perhaps
* makes sense from a Windows perspective.
*
* But looking at the actual use cases of this function in GTK+
* and GNOME software, what we really want is the "share"
* subdirectory of the installation directory for the package
* our caller is a part of.
*
* The address_of_function parameter, if non-NULL, points to a
* function in the calling module. Use that to determine that
* module's installation folder, and use its "share" subfolder.
*
* Additionally, also use the "share" subfolder of the installation
* locations of GLib and the .exe file being run.
*
* To guard against none of the above being what is really wanted,
* callers of this function should have Win32-specific code to look
* up their installation folder themselves, and handle a subfolder
* "share" of it in the same way as the folders returned from this
* function.
*/
p = get_module_share_dir (address_of_function);
if (p)
g_array_append_val (data_dirs, p);
if (glib_dll != NULL)
{
gchar *glib_root = g_win32_get_package_installation_directory_of_module (glib_dll);
p = g_build_filename (glib_root, "share", NULL);
if (p)
g_array_append_val (data_dirs, p);
g_free (glib_root);
}
exe_root = g_win32_get_package_installation_directory_of_module (NULL);
p = g_build_filename (exe_root, "share", NULL);
if (p)
g_array_append_val (data_dirs, p);
g_free (exe_root);
retval = (gchar **) g_array_free (data_dirs, FALSE);
if (address_of_function)
{
if (hmodule != NULL)
g_hash_table_insert (per_module_data_dirs, hmodule, retval);
G_UNLOCK (g_utils_global);
}
return (const gchar * const *) retval;
}
#endif
/**
* g_get_system_data_dirs:
*
* Returns an ordered list of base directories in which to access
* system-wide application data.
*
* On UNIX platforms this is determined using the mechanisms described
* in the
* [XDG Base Directory Specification](http://www.freedesktop.org/Standards/basedir-spec)
* In this case the list of directories retrieved will be XDG_DATA_DIRS.
*
* On Windows the first elements in the list are the Application Data
* and Documents folders for All Users. (These can be determined only
* on Windows 2000 or later and are not present in the list on other
* Windows versions.) See documentation for CSIDL_COMMON_APPDATA and
* CSIDL_COMMON_DOCUMENTS.
*
* Then follows the "share" subfolder in the installation folder for
* the package containing the DLL that calls this function, if it can
* be determined.
*
* Finally the list contains the "share" subfolder in the installation
* folder for GLib, and in the installation folder for the package the
* application's .exe file belongs to.
*
* The installation folders above are determined by looking up the
* folder where the module (DLL or EXE) in question is located. If the
* folder's name is "bin", its parent is used, otherwise the folder
* itself.
*
* Note that on Windows the returned list can vary depending on where
* this function is called.
*
* Returns: (array zero-terminated=1) (transfer none): a %NULL-terminated array of strings owned by GLib that must
* not be modified or freed.
* Since: 2.6
**/
const gchar * const *
g_get_system_data_dirs (void)
{
gchar **data_dir_vector;
G_LOCK (g_utils_global);
if (!g_system_data_dirs)
{
#ifdef G_OS_WIN32
data_dir_vector = (gchar **) g_win32_get_system_data_dirs_for_module (NULL);
#else
gchar *data_dirs = (gchar *) g_getenv ("XDG_DATA_DIRS");
if (!data_dirs || !data_dirs[0])
data_dirs = "/usr/local/share/:/usr/share/";
data_dir_vector = g_strsplit (data_dirs, G_SEARCHPATH_SEPARATOR_S, 0);
#endif
g_system_data_dirs = data_dir_vector;
}
else
data_dir_vector = g_system_data_dirs;
G_UNLOCK (g_utils_global);
return (const gchar * const *) data_dir_vector;
}
/**
* g_get_system_config_dirs:
*
* Returns an ordered list of base directories in which to access
* system-wide configuration information.
*
* On UNIX platforms this is determined using the mechanisms described
* in the
* [XDG Base Directory Specification](http://www.freedesktop.org/Standards/basedir-spec).
* In this case the list of directories retrieved will be `XDG_CONFIG_DIRS`.
*
* On Windows is the directory that contains application data for all users.
* A typical path is C:\Documents and Settings\All Users\Application Data.
* This folder is used for application data that is not user specific.
* For example, an application can store a spell-check dictionary, a database
* of clip art, or a log file in the CSIDL_COMMON_APPDATA folder.
* This information will not roam and is available to anyone using the computer.
*
* Returns: (array zero-terminated=1) (transfer none): a %NULL-terminated array of strings owned by GLib that must
* not be modified or freed.
* Since: 2.6
**/
const gchar * const *
g_get_system_config_dirs (void)
{
gchar *conf_dirs, **conf_dir_vector;
G_LOCK (g_utils_global);
if (!g_system_config_dirs)
{
#ifdef G_OS_WIN32
conf_dirs = get_special_folder (CSIDL_COMMON_APPDATA);
if (conf_dirs)
{
conf_dir_vector = g_strsplit (conf_dirs, G_SEARCHPATH_SEPARATOR_S, 0);
g_free (conf_dirs);
}
else
{
/* Return empty list */
conf_dir_vector = g_strsplit ("", G_SEARCHPATH_SEPARATOR_S, 0);
}
#else
conf_dirs = (gchar *) g_getenv ("XDG_CONFIG_DIRS");
if (!conf_dirs || !conf_dirs[0])
conf_dirs = "/etc/xdg";
conf_dir_vector = g_strsplit (conf_dirs, G_SEARCHPATH_SEPARATOR_S, 0);
#endif
g_system_config_dirs = conf_dir_vector;
}
else
conf_dir_vector = g_system_config_dirs;
G_UNLOCK (g_utils_global);
return (const gchar * const *) conf_dir_vector;
}
/**
* g_nullify_pointer:
* @nullify_location: the memory address of the pointer.
*
* Set the pointer at the specified location to %NULL.
**/
void
g_nullify_pointer (gpointer *nullify_location)
{
g_return_if_fail (nullify_location != NULL);
*nullify_location = NULL;
}
#define KILOBYTE_FACTOR (G_GOFFSET_CONSTANT (1000))
#define MEGABYTE_FACTOR (KILOBYTE_FACTOR * KILOBYTE_FACTOR)
#define GIGABYTE_FACTOR (MEGABYTE_FACTOR * KILOBYTE_FACTOR)
#define TERABYTE_FACTOR (GIGABYTE_FACTOR * KILOBYTE_FACTOR)
#define PETABYTE_FACTOR (TERABYTE_FACTOR * KILOBYTE_FACTOR)
#define EXABYTE_FACTOR (PETABYTE_FACTOR * KILOBYTE_FACTOR)
#define KIBIBYTE_FACTOR (G_GOFFSET_CONSTANT (1024))
#define MEBIBYTE_FACTOR (KIBIBYTE_FACTOR * KIBIBYTE_FACTOR)
#define GIBIBYTE_FACTOR (MEBIBYTE_FACTOR * KIBIBYTE_FACTOR)
#define TEBIBYTE_FACTOR (GIBIBYTE_FACTOR * KIBIBYTE_FACTOR)
#define PEBIBYTE_FACTOR (TEBIBYTE_FACTOR * KIBIBYTE_FACTOR)
#define EXBIBYTE_FACTOR (PEBIBYTE_FACTOR * KIBIBYTE_FACTOR)
/**
* g_format_size:
* @size: a size in bytes
*
* Formats a size (for example the size of a file) into a human readable
* string. Sizes are rounded to the nearest size prefix (kB, MB, GB)
* and are displayed rounded to the nearest tenth. E.g. the file size
* 3292528 bytes will be converted into the string "3.2 MB".
*
* The prefix units base is 1000 (i.e. 1 kB is 1000 bytes).
*
* This string should be freed with g_free() when not needed any longer.
*
* See g_format_size_full() for more options about how the size might be
* formatted.
*
* Returns: a newly-allocated formatted string containing a human readable
* file size
*
* Since: 2.30
*/
gchar *
g_format_size (guint64 size)
{
return g_format_size_full (size, G_FORMAT_SIZE_DEFAULT);
}
/**
* GFormatSizeFlags:
* @G_FORMAT_SIZE_DEFAULT: behave the same as g_format_size()
* @G_FORMAT_SIZE_LONG_FORMAT: include the exact number of bytes as part
* of the returned string. For example, "45.6 kB (45,612 bytes)".
* @G_FORMAT_SIZE_IEC_UNITS: use IEC (base 1024) units with "KiB"-style
* suffixes. IEC units should only be used for reporting things with
* a strong "power of 2" basis, like RAM sizes or RAID stripe sizes.
* Network and storage sizes should be reported in the normal SI units.
*
* Flags to modify the format of the string returned by g_format_size_full().
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
/**
* g_format_size_full:
* @size: a size in bytes
* @flags: #GFormatSizeFlags to modify the output
*
* Formats a size.
*
* This function is similar to g_format_size() but allows for flags
* that modify the output. See #GFormatSizeFlags.
*
* Returns: a newly-allocated formatted string containing a human
* readable file size
*
* Since: 2.30
*/
gchar *
g_format_size_full (guint64 size,
GFormatSizeFlags flags)
{
GString *string;
string = g_string_new (NULL);
if (flags & G_FORMAT_SIZE_IEC_UNITS)
{
if (size < KIBIBYTE_FACTOR)
{
g_string_printf (string,
g_dngettext(GETTEXT_PACKAGE, "%u byte", "%u bytes", (guint) size),
(guint) size);
flags &= ~G_FORMAT_SIZE_LONG_FORMAT;
}
else if (size < MEBIBYTE_FACTOR)
g_string_printf (string, _("%.1f KiB"), (gdouble) size / (gdouble) KIBIBYTE_FACTOR);
else if (size < GIBIBYTE_FACTOR)
g_string_printf (string, _("%.1f MiB"), (gdouble) size / (gdouble) MEBIBYTE_FACTOR);
else if (size < TEBIBYTE_FACTOR)
g_string_printf (string, _("%.1f GiB"), (gdouble) size / (gdouble) GIBIBYTE_FACTOR);
else if (size < PEBIBYTE_FACTOR)
g_string_printf (string, _("%.1f TiB"), (gdouble) size / (gdouble) TEBIBYTE_FACTOR);
else if (size < EXBIBYTE_FACTOR)
g_string_printf (string, _("%.1f PiB"), (gdouble) size / (gdouble) PEBIBYTE_FACTOR);
else
g_string_printf (string, _("%.1f EiB"), (gdouble) size / (gdouble) EXBIBYTE_FACTOR);
}
else
{
if (size < KILOBYTE_FACTOR)
{
g_string_printf (string,
g_dngettext(GETTEXT_PACKAGE, "%u byte", "%u bytes", (guint) size),
(guint) size);
flags &= ~G_FORMAT_SIZE_LONG_FORMAT;
}
else if (size < MEGABYTE_FACTOR)
g_string_printf (string, _("%.1f kB"), (gdouble) size / (gdouble) KILOBYTE_FACTOR);
else if (size < GIGABYTE_FACTOR)
g_string_printf (string, _("%.1f MB"), (gdouble) size / (gdouble) MEGABYTE_FACTOR);
else if (size < TERABYTE_FACTOR)
g_string_printf (string, _("%.1f GB"), (gdouble) size / (gdouble) GIGABYTE_FACTOR);
else if (size < PETABYTE_FACTOR)
g_string_printf (string, _("%.1f TB"), (gdouble) size / (gdouble) TERABYTE_FACTOR);
else if (size < EXABYTE_FACTOR)
g_string_printf (string, _("%.1f PB"), (gdouble) size / (gdouble) PETABYTE_FACTOR);
else
g_string_printf (string, _("%.1f EB"), (gdouble) size / (gdouble) EXABYTE_FACTOR);
}
if (flags & G_FORMAT_SIZE_LONG_FORMAT)
{
/* First problem: we need to use the number of bytes to decide on
* the plural form that is used for display, but the number of
* bytes potentially exceeds the size of a guint (which is what
* ngettext() takes).
*
* From a pragmatic standpoint, it seems that all known languages
* base plural forms on one or both of the following:
*
* - the lowest digits of the number
*
* - if the number if greater than some small value
*
* Here's how we fake it: Draw an arbitrary line at one thousand.
* If the number is below that, then fine. If it is above it,
* then we take the modulus of the number by one thousand (in
* order to keep the lowest digits) and add one thousand to that
* (in order to ensure that 1001 is not treated the same as 1).
*/
guint plural_form = size < 1000 ? size : size % 1000 + 1000;
/* Second problem: we need to translate the string "%u byte" and
* "%u bytes" for pluralisation, but the correct number format to
* use for a gsize is different depending on which architecture
* we're on.
*
* Solution: format the number separately and use "%s bytes" on
* all platforms.
*/
const gchar *translated_format;
gchar *formatted_number;
/* Translators: the %s in "%s bytes" will always be replaced by a number. */
translated_format = g_dngettext(GETTEXT_PACKAGE, "%s byte", "%s bytes", plural_form);
/* XXX: Windows doesn't support the "'" format modifier, so we
* must not use it there. Instead, just display the number
* without separation. Bug #655336 is open until a solution is
* found.
*/
#ifndef G_OS_WIN32
formatted_number = g_strdup_printf ("%'"G_GUINT64_FORMAT, size);
#else
formatted_number = g_strdup_printf ("%"G_GUINT64_FORMAT, size);
#endif
g_string_append (string, " (");
g_string_append_printf (string, translated_format, formatted_number);
g_free (formatted_number);
g_string_append (string, ")");
}
return g_string_free (string, FALSE);
}
#pragma GCC diagnostic pop
/**
* g_format_size_for_display:
* @size: a size in bytes
*
* Formats a size (for example the size of a file) into a human
* readable string. Sizes are rounded to the nearest size prefix
* (KB, MB, GB) and are displayed rounded to the nearest tenth.
* E.g. the file size 3292528 bytes will be converted into the
* string "3.1 MB".
*
* The prefix units base is 1024 (i.e. 1 KB is 1024 bytes).
*
* This string should be freed with g_free() when not needed any longer.
*
* Returns: a newly-allocated formatted string containing a human
* readable file size
*
* Since: 2.16
*
* Deprecated:2.30: This function is broken due to its use of SI
* suffixes to denote IEC units. Use g_format_size() instead.
*/
gchar *
g_format_size_for_display (goffset size)
{
if (size < (goffset) KIBIBYTE_FACTOR)
return g_strdup_printf (g_dngettext(GETTEXT_PACKAGE, "%u byte", "%u bytes",(guint) size), (guint) size);
else
{
gdouble displayed_size;
if (size < (goffset) MEBIBYTE_FACTOR)
{
displayed_size = (gdouble) size / (gdouble) KIBIBYTE_FACTOR;
/* Translators: this is from the deprecated function g_format_size_for_display() which uses 'KB' to
* mean 1024 bytes. I am aware that 'KB' is not correct, but it has been preserved for reasons of
* compatibility. Users will not see this string unless a program is using this deprecated function.
* Please translate as literally as possible.
*/
return g_strdup_printf (_("%.1f KB"), displayed_size);
}
else if (size < (goffset) GIBIBYTE_FACTOR)
{
displayed_size = (gdouble) size / (gdouble) MEBIBYTE_FACTOR;
return g_strdup_printf (_("%.1f MB"), displayed_size);
}
else if (size < (goffset) TEBIBYTE_FACTOR)
{
displayed_size = (gdouble) size / (gdouble) GIBIBYTE_FACTOR;
return g_strdup_printf (_("%.1f GB"), displayed_size);
}
else if (size < (goffset) PEBIBYTE_FACTOR)
{
displayed_size = (gdouble) size / (gdouble) TEBIBYTE_FACTOR;
return g_strdup_printf (_("%.1f TB"), displayed_size);
}
else if (size < (goffset) EXBIBYTE_FACTOR)
{
displayed_size = (gdouble) size / (gdouble) PEBIBYTE_FACTOR;
return g_strdup_printf (_("%.1f PB"), displayed_size);
}
else
{
displayed_size = (gdouble) size / (gdouble) EXBIBYTE_FACTOR;
return g_strdup_printf (_("%.1f EB"), displayed_size);
}
}
}
#if defined (G_OS_WIN32) && !defined (_WIN64)
/* Binary compatibility versions. Not for newly compiled code. */
_GLIB_EXTERN const gchar *g_get_user_name_utf8 (void);
_GLIB_EXTERN const gchar *g_get_real_name_utf8 (void);
_GLIB_EXTERN const gchar *g_get_home_dir_utf8 (void);
_GLIB_EXTERN const gchar *g_get_tmp_dir_utf8 (void);
_GLIB_EXTERN gchar *g_find_program_in_path_utf8 (const gchar *program);
gchar *
g_find_program_in_path_utf8 (const gchar *program)
{
return g_find_program_in_path (program);
}
const gchar *g_get_user_name_utf8 (void) { return g_get_user_name (); }
const gchar *g_get_real_name_utf8 (void) { return g_get_real_name (); }
const gchar *g_get_home_dir_utf8 (void) { return g_get_home_dir (); }
const gchar *g_get_tmp_dir_utf8 (void) { return g_get_tmp_dir (); }
#endif
/* Private API:
*
* Returns %TRUE if the current process was executed as setuid (or an
* equivalent __libc_enable_secure is available). See:
* http://osdir.com/ml/linux.lfs.hardened/2007-04/msg00032.html
*/
gboolean
g_check_setuid (void)
{
/* TODO: get __libc_enable_secure exported from glibc.
* See http://www.openwall.com/lists/owl-dev/2012/08/14/1
*/
#if 0 && defined(HAVE_LIBC_ENABLE_SECURE)
{
/* See glibc/include/unistd.h */
extern int __libc_enable_secure;
return __libc_enable_secure;
}
#elif defined(HAVE_ISSETUGID) && !defined(__BIONIC__)
/* BSD: http://www.freebsd.org/cgi/man.cgi?query=issetugid&sektion=2 */
/* Android had it in older versions but the new 64 bit ABI does not
* have it anymore, and some versions of the 32 bit ABI neither.
* https://code.google.com/p/android-developer-preview/issues/detail?id=168
*/
return issetugid ();
#elif defined(G_OS_UNIX)
uid_t ruid, euid, suid; /* Real, effective and saved user ID's */
gid_t rgid, egid, sgid; /* Real, effective and saved group ID's */
static gsize check_setuid_initialised;
static gboolean is_setuid;
if (g_once_init_enter (&check_setuid_initialised))
{
#ifdef HAVE_GETRESUID
/* These aren't in the header files, so we prototype them here.
*/
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
if (getresuid (&ruid, &euid, &suid) != 0 ||
getresgid (&rgid, &egid, &sgid) != 0)
#endif /* HAVE_GETRESUID */
{
suid = ruid = getuid ();
sgid = rgid = getgid ();
euid = geteuid ();
egid = getegid ();
}
is_setuid = (ruid != euid || ruid != suid ||
rgid != egid || rgid != sgid);
g_once_init_leave (&check_setuid_initialised, 1);
}
return is_setuid;
#else
return FALSE;
#endif
}
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