1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18 /*
19 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GLib Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GLib at ftp://ftp.gtk.org/pub/gtk/.
23 */
24
25 #ifndef __G_UTILS_H__
26 #define __G_UTILS_H__
27
28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
29 #error "Only <glib.h> can be included directly."
30 #endif
31
32 #include <glib/gtypes.h>
33 #include <stdarg.h>
34
35 G_BEGIN_DECLS
36
37 /* Define G_VA_COPY() to do the right thing for copying va_list variables.
38 * glibconfig.h may have already defined G_VA_COPY as va_copy or __va_copy.
39 */
40 #if !defined (G_VA_COPY)
41 # if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
42 # define G_VA_COPY(ap1, ap2) (*(ap1) = *(ap2))
43 # elif defined (G_VA_COPY_AS_ARRAY)
44 # define G_VA_COPY(ap1, ap2) memmove ((ap1), (ap2), sizeof (va_list))
45 # else /* va_list is a pointer */
46 # define G_VA_COPY(ap1, ap2) ((ap1) = (ap2))
47 # endif /* va_list is a pointer */
48 #endif /* !G_VA_COPY */
49
50 GLIB_AVAILABLE_IN_ALL
51 const gchar * g_get_user_name (void);
52 GLIB_AVAILABLE_IN_ALL
53 const gchar * g_get_real_name (void);
54 GLIB_AVAILABLE_IN_ALL
55 const gchar * g_get_home_dir (void);
56 GLIB_AVAILABLE_IN_ALL
57 const gchar * g_get_tmp_dir (void);
58 GLIB_AVAILABLE_IN_ALL
59 const gchar * g_get_host_name (void);
60 GLIB_AVAILABLE_IN_ALL
61 const gchar * g_get_prgname (void);
62 GLIB_AVAILABLE_IN_ALL
63 void g_set_prgname (const gchar *prgname);
64 GLIB_AVAILABLE_IN_ALL
65 const gchar * g_get_application_name (void);
66 GLIB_AVAILABLE_IN_ALL
67 void g_set_application_name (const gchar *application_name);
68
69 GLIB_AVAILABLE_IN_ALL
70 void g_reload_user_special_dirs_cache (void);
71 GLIB_AVAILABLE_IN_ALL
72 const gchar * g_get_user_data_dir (void);
73 GLIB_AVAILABLE_IN_ALL
74 const gchar * g_get_user_config_dir (void);
75 GLIB_AVAILABLE_IN_ALL
76 const gchar * g_get_user_cache_dir (void);
77 GLIB_AVAILABLE_IN_ALL
78 const gchar * const * g_get_system_data_dirs (void);
79
80 #ifdef G_OS_WIN32
81 /* This function is not part of the public GLib API */
82 GLIB_AVAILABLE_IN_ALL
83 const gchar * const * g_win32_get_system_data_dirs_for_module (void (*address_of_function)(void));
84 #endif
85
86 #if defined (G_OS_WIN32) && defined (G_CAN_INLINE)
87 /* This function is not part of the public GLib API either. Just call
88 * g_get_system_data_dirs() in your code, never mind that that is
89 * actually a macro and you will in fact call this inline function.
90 */
91 static inline const gchar * const *
_g_win32_get_system_data_dirs(void)92 _g_win32_get_system_data_dirs (void)
93 {
94 return g_win32_get_system_data_dirs_for_module ((void (*)(void)) &_g_win32_get_system_data_dirs);
95 }
96 #define g_get_system_data_dirs _g_win32_get_system_data_dirs
97 #endif
98
99 GLIB_AVAILABLE_IN_ALL
100 const gchar * const * g_get_system_config_dirs (void);
101
102 GLIB_AVAILABLE_IN_ALL
103 const gchar * g_get_user_runtime_dir (void);
104
105 /**
106 * GUserDirectory:
107 * @G_USER_DIRECTORY_DESKTOP: the user's Desktop directory
108 * @G_USER_DIRECTORY_DOCUMENTS: the user's Documents directory
109 * @G_USER_DIRECTORY_DOWNLOAD: the user's Downloads directory
110 * @G_USER_DIRECTORY_MUSIC: the user's Music directory
111 * @G_USER_DIRECTORY_PICTURES: the user's Pictures directory
112 * @G_USER_DIRECTORY_PUBLIC_SHARE: the user's shared directory
113 * @G_USER_DIRECTORY_TEMPLATES: the user's Templates directory
114 * @G_USER_DIRECTORY_VIDEOS: the user's Movies directory
115 * @G_USER_N_DIRECTORIES: the number of enum values
116 *
117 * These are logical ids for special directories which are defined
118 * depending on the platform used. You should use g_get_user_special_dir()
119 * to retrieve the full path associated to the logical id.
120 *
121 * The #GUserDirectory enumeration can be extended at later date. Not
122 * every platform has a directory for every logical id in this
123 * enumeration.
124 *
125 * Since: 2.14
126 */
127 typedef enum {
128 G_USER_DIRECTORY_DESKTOP,
129 G_USER_DIRECTORY_DOCUMENTS,
130 G_USER_DIRECTORY_DOWNLOAD,
131 G_USER_DIRECTORY_MUSIC,
132 G_USER_DIRECTORY_PICTURES,
133 G_USER_DIRECTORY_PUBLIC_SHARE,
134 G_USER_DIRECTORY_TEMPLATES,
135 G_USER_DIRECTORY_VIDEOS,
136
137 G_USER_N_DIRECTORIES
138 } GUserDirectory;
139
140 GLIB_AVAILABLE_IN_ALL
141 const gchar * g_get_user_special_dir (GUserDirectory directory);
142
143 /**
144 * GDebugKey:
145 * @key: the string
146 * @value: the flag
147 *
148 * Associates a string with a bit flag.
149 * Used in g_parse_debug_string().
150 */
151 typedef struct _GDebugKey GDebugKey;
152 struct _GDebugKey
153 {
154 const gchar *key;
155 guint value;
156 };
157
158 /* Miscellaneous utility functions
159 */
160 GLIB_AVAILABLE_IN_ALL
161 guint g_parse_debug_string (const gchar *string,
162 const GDebugKey *keys,
163 guint nkeys);
164
165 GLIB_AVAILABLE_IN_ALL
166 gint g_snprintf (gchar *string,
167 gulong n,
168 gchar const *format,
169 ...) G_GNUC_PRINTF (3, 4);
170 GLIB_AVAILABLE_IN_ALL
171 gint g_vsnprintf (gchar *string,
172 gulong n,
173 gchar const *format,
174 va_list args)
175 G_GNUC_PRINTF(3, 0);
176
177 GLIB_AVAILABLE_IN_ALL
178 void g_nullify_pointer (gpointer *nullify_location);
179
180 typedef enum
181 {
182 G_FORMAT_SIZE_DEFAULT = 0,
183 G_FORMAT_SIZE_LONG_FORMAT = 1 << 0,
184 G_FORMAT_SIZE_IEC_UNITS = 1 << 1,
185 G_FORMAT_SIZE_BITS = 1 << 2
186 } GFormatSizeFlags;
187
188 GLIB_AVAILABLE_IN_2_30
189 gchar *g_format_size_full (guint64 size,
190 GFormatSizeFlags flags);
191 GLIB_AVAILABLE_IN_2_30
192 gchar *g_format_size (guint64 size);
193
194 GLIB_DEPRECATED_IN_2_30_FOR(g_format_size)
195 gchar *g_format_size_for_display (goffset size);
196
197 #define g_ATEXIT(proc) (atexit (proc)) GLIB_DEPRECATED_MACRO_IN_2_32
198 #define g_memmove(dest,src,len) \
199 G_STMT_START { memmove ((dest), (src), (len)); } G_STMT_END GLIB_DEPRECATED_MACRO_IN_2_40_FOR(memmove)
200
201 /**
202 * GVoidFunc:
203 *
204 * Declares a type of function which takes no arguments
205 * and has no return value. It is used to specify the type
206 * function passed to g_atexit().
207 */
208 typedef void (*GVoidFunc) (void) GLIB_DEPRECATED_TYPE_IN_2_32;
209 #define ATEXIT(proc) g_ATEXIT(proc) GLIB_DEPRECATED_MACRO_IN_2_32
210
211 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
212 GLIB_DEPRECATED
213 void g_atexit (GVoidFunc func);
214 G_GNUC_END_IGNORE_DEPRECATIONS
215
216 #ifdef G_OS_WIN32
217 /* It's a bad idea to wrap atexit() on Windows. If the GLib DLL calls
218 * atexit(), the function will be called when the GLib DLL is detached
219 * from the program, which is not what the caller wants. The caller
220 * wants the function to be called when it *itself* exits (or is
221 * detached, in case the caller, too, is a DLL).
222 */
223 #if (defined(__MINGW_H) && !defined(_STDLIB_H_)) || (defined(_MSC_VER) && !defined(_INC_STDLIB))
224 int atexit (void (*)(void));
225 #endif
226 #define g_atexit(func) atexit(func) GLIB_DEPRECATED_MACRO_IN_2_32
227 #endif
228
229
230 /* Look for an executable in PATH, following execvp() rules */
231 GLIB_AVAILABLE_IN_ALL
232 gchar* g_find_program_in_path (const gchar *program);
233
234 /* Bit tests
235 *
236 * These are defined in a convoluted way because we want the compiler to
237 * be able to inline the code for performance reasons, but for
238 * historical reasons, we must continue to provide non-inline versions
239 * on our ABI.
240 *
241 * We define these as functions in gutils.c which are just implemented
242 * as calls to the _impl() versions in order to preserve the ABI.
243 */
244
245 #define g_bit_nth_lsf(mask, nth_bit) g_bit_nth_lsf_impl(mask, nth_bit)
246 #define g_bit_nth_msf(mask, nth_bit) g_bit_nth_msf_impl(mask, nth_bit)
247 #define g_bit_storage(number) g_bit_storage_impl(number)
248
249 GLIB_AVAILABLE_IN_ALL
250 gint (g_bit_nth_lsf) (gulong mask,
251 gint nth_bit);
252 GLIB_AVAILABLE_IN_ALL
253 gint (g_bit_nth_msf) (gulong mask,
254 gint nth_bit);
255 GLIB_AVAILABLE_IN_ALL
256 guint (g_bit_storage) (gulong number);
257
258 static inline gint
g_bit_nth_lsf_impl(gulong mask,gint nth_bit)259 g_bit_nth_lsf_impl (gulong mask,
260 gint nth_bit)
261 {
262 if (G_UNLIKELY (nth_bit < -1))
263 nth_bit = -1;
264 while (nth_bit < ((GLIB_SIZEOF_LONG * 8) - 1))
265 {
266 nth_bit++;
267 if (mask & (1UL << nth_bit))
268 return nth_bit;
269 }
270 return -1;
271 }
272
273 static inline gint
g_bit_nth_msf_impl(gulong mask,gint nth_bit)274 g_bit_nth_msf_impl (gulong mask,
275 gint nth_bit)
276 {
277 if (nth_bit < 0 || G_UNLIKELY (nth_bit > GLIB_SIZEOF_LONG * 8))
278 nth_bit = GLIB_SIZEOF_LONG * 8;
279 while (nth_bit > 0)
280 {
281 nth_bit--;
282 if (mask & (1UL << nth_bit))
283 return nth_bit;
284 }
285 return -1;
286 }
287
288 static inline guint
g_bit_storage_impl(gulong number)289 g_bit_storage_impl (gulong number)
290 {
291 #if defined(__GNUC__) && (__GNUC__ >= 4) && defined(__OPTIMIZE__)
292 return G_LIKELY (number) ?
293 ((GLIB_SIZEOF_LONG * 8U - 1) ^ (guint) __builtin_clzl(number)) + 1 : 1;
294 #else
295 guint n_bits = 0;
296
297 do
298 {
299 n_bits++;
300 number >>= 1;
301 }
302 while (number);
303 return n_bits;
304 #endif
305 }
306
307 /* Crashes the program. */
308 #if GLIB_VERSION_MAX_ALLOWED >= GLIB_VERSION_2_50
309 #ifndef G_OS_WIN32
310 # include <stdlib.h>
311 # define g_abort() abort ()
312 #else
313 GLIB_AVAILABLE_IN_2_50
314 void g_abort (void) G_GNUC_NORETURN G_ANALYZER_NORETURN;
315 #endif
316 #endif
317
318 /*
319 * This macro is deprecated. This DllMain() is too complex. It is
320 * recommended to write an explicit minimal DLlMain() that just saves
321 * the handle to the DLL and then use that handle instead, for
322 * instance passing it to
323 * g_win32_get_package_installation_directory_of_module().
324 *
325 * On Windows, this macro defines a DllMain function that stores the
326 * actual DLL name that the code being compiled will be included in.
327 * STATIC should be empty or 'static'. DLL_NAME is the name of the
328 * (pointer to the) char array where the DLL name will be stored. If
329 * this is used, you must also include <windows.h>. If you need a more complex
330 * DLL entry point function, you cannot use this.
331 *
332 * On non-Windows platforms, expands to nothing.
333 */
334
335 #ifndef G_PLATFORM_WIN32
336 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name) GLIB_DEPRECATED_MACRO_IN_2_26
337 #else
338 # define G_WIN32_DLLMAIN_FOR_DLL_NAME(static, dll_name) \
339 static char *dll_name; \
340 \
341 BOOL WINAPI \
342 DllMain (HINSTANCE hinstDLL, \
343 DWORD fdwReason, \
344 LPVOID lpvReserved) \
345 { \
346 wchar_t wcbfr[1000]; \
347 char *tem; \
348 switch (fdwReason) \
349 { \
350 case DLL_PROCESS_ATTACH: \
351 GetModuleFileNameW ((HMODULE) hinstDLL, wcbfr, G_N_ELEMENTS (wcbfr)); \
352 tem = g_utf16_to_utf8 (wcbfr, -1, NULL, NULL, NULL); \
353 dll_name = g_path_get_basename (tem); \
354 g_free (tem); \
355 break; \
356 } \
357 \
358 return TRUE; \
359 } GLIB_DEPRECATED_MACRO_IN_2_26
360 #endif /* G_PLATFORM_WIN32 */
361
362 G_END_DECLS
363
364 #endif /* __G_UTILS_H__ */
365