1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
2 /* NetworkManager -- Network link manager
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 of the License, or (at your option) any later version.
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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301 USA.
19 * (C) Copyright 2014 Red Hat, Inc.
22 #ifndef __NM_MACROS_INTERNAL_H__
23 #define __NM_MACROS_INTERNAL_H__
27 /********************************************************/
29 #define nm_auto(fcn) __attribute ((cleanup(fcn)))
34 * Call free() on a variable location when it goes out of scope.
36 #define nm_auto_free nm_auto(_nm_auto_free_impl)
37 GS_DEFINE_CLEANUP_FUNCTION(void*, _nm_auto_free_impl, free)
40 _nm_auto_unset_gvalue_impl (GValue *v)
44 #define nm_auto_unset_gvalue nm_auto(_nm_auto_unset_gvalue_impl)
46 /********************************************************/
48 /* http://stackoverflow.com/a/11172679 */
49 #define _NM_UTILS_MACRO_FIRST(...) __NM_UTILS_MACRO_FIRST_HELPER(__VA_ARGS__, throwaway)
50 #define __NM_UTILS_MACRO_FIRST_HELPER(first, ...) first
52 #define _NM_UTILS_MACRO_REST(...) __NM_UTILS_MACRO_REST_HELPER(__NM_UTILS_MACRO_REST_NUM(__VA_ARGS__), __VA_ARGS__)
53 #define __NM_UTILS_MACRO_REST_HELPER(qty, ...) __NM_UTILS_MACRO_REST_HELPER2(qty, __VA_ARGS__)
54 #define __NM_UTILS_MACRO_REST_HELPER2(qty, ...) __NM_UTILS_MACRO_REST_HELPER_##qty(__VA_ARGS__)
55 #define __NM_UTILS_MACRO_REST_HELPER_ONE(first)
56 #define __NM_UTILS_MACRO_REST_HELPER_TWOORMORE(first, ...) , __VA_ARGS__
57 #define __NM_UTILS_MACRO_REST_NUM(...) \
58 __NM_UTILS_MACRO_REST_SELECT_20TH(__VA_ARGS__, \
59 TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
60 TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
61 TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE, TWOORMORE,\
62 TWOORMORE, TWOORMORE, TWOORMORE, ONE, throwaway)
63 #define __NM_UTILS_MACRO_REST_SELECT_20TH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, ...) a20
65 /********************************************************/
67 /* http://stackoverflow.com/a/2124385/354393 */
69 #define NM_NARG(...) \
70 _NM_NARG(__VA_ARGS__,_NM_NARG_RSEQ_N())
71 #define _NM_NARG(...) \
72 _NM_NARG_ARG_N(__VA_ARGS__)
73 #define _NM_NARG_ARG_N( \
74 _1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
75 _11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
76 _21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
77 _31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
78 _41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
79 _51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
81 #define _NM_NARG_RSEQ_N() \
83 59,58,57,56,55,54,53,52,51,50, \
84 49,48,47,46,45,44,43,42,41,40, \
85 39,38,37,36,35,34,33,32,31,30, \
86 29,28,27,26,25,24,23,22,21,20, \
87 19,18,17,16,15,14,13,12,11,10, \
90 /********************************************************/
92 #if defined (__GNUC__)
93 #define _NM_PRAGMA_WARNING_DO(warning) G_STRINGIFY(GCC diagnostic ignored warning)
94 #elif defined (__clang__)
95 #define _NM_PRAGMA_WARNING_DO(warning) G_STRINGIFY(clang diagnostic ignored warning)
98 /* you can only suppress a specific warning that the compiler
99 * understands. Otherwise you will get another compiler warning
100 * about invalid pragma option.
101 * It's not that bad however, because gcc and clang often have the
102 * same name for the same warning. */
104 #if defined (__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
105 #define NM_PRAGMA_WARNING_DISABLE(warning) \
106 _Pragma("GCC diagnostic push") \
107 _Pragma(_NM_PRAGMA_WARNING_DO(warning))
108 #elif defined (__clang__)
109 #define NM_PRAGMA_WARNING_DISABLE(warning) \
110 _Pragma("clang diagnostic push") \
111 _Pragma(_NM_PRAGMA_WARNING_DO(warning))
113 #define NM_PRAGMA_WARNING_DISABLE(warning)
116 #if defined (__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
117 #define NM_PRAGMA_WARNING_REENABLE \
118 _Pragma("GCC diagnostic pop")
119 #elif defined (__clang__)
120 #define NM_PRAGMA_WARNING_REENABLE \
121 _Pragma("clang diagnostic pop")
123 #define NM_PRAGMA_WARNING_REENABLE
126 /********************************************************/
130 * @error: (allow none): the #GError instance
132 * All functions must follow the convention that when they
133 * return a failure, they must also set the GError to a valid
134 * message. For external API however, we want to be extra
135 * careful before accessing the error instance. Use NM_G_ERROR_MSG()
136 * which is safe to use on NULL.
138 * Returns: the error message.
140 static inline const char *
141 NM_G_ERROR_MSG (GError *error)
143 return error ? (error->message ? : "(null)") : "(no-error)"; \
146 /********************************************************/
148 /* macro to return strlen() of a compile time string. */
149 #define NM_STRLEN(str) ( sizeof ("" str) - 1 )
151 #define NM_SET_OUT(out_val, value) \
153 typeof(*(out_val)) *_out_val = (out_val); \
156 *_out_val = (value); \
160 /********************************************************/
162 #define _NM_IN_SET_EVAL_1(op, _x, y1) \
165 #define _NM_IN_SET_EVAL_2(op, _x, y1, y2) \
170 #define _NM_IN_SET_EVAL_3(op, _x, y1, y2, y3) \
176 #define _NM_IN_SET_EVAL_4(op, _x, y1, y2, y3, y4) \
183 #define _NM_IN_SET_EVAL_5(op, _x, y1, y2, y3, y4, y5) \
191 #define _NM_IN_SET_EVAL_6(op, _x, y1, y2, y3, y4, y5, y6) \
200 #define _NM_IN_SET_EVAL_N2(op, _x, n, ...) _NM_IN_SET_EVAL_##n(op, _x, __VA_ARGS__)
201 #define _NM_IN_SET_EVAL_N(op, x, n, ...) \
203 typeof(x) _x = (x); \
204 !!_NM_IN_SET_EVAL_N2(op, _x, n, __VA_ARGS__); \
207 /* Beware that this does short-circuit evaluation (use "||" instead of "|")
208 * which has a possibly unexpected non-function-like behavior.
209 * Use NM_IN_SET_SE if you need all arguments to be evaluted. */
210 #define NM_IN_SET(x, ...) _NM_IN_SET_EVAL_N(||, x, NM_NARG (__VA_ARGS__), __VA_ARGS__)
212 /* "SE" stands for "side-effect". Contrary to NM_IN_SET(), this does not do
213 * short-circuit evaluation, which can make a difference if the arguments have
215 #define NM_IN_SET_SE(x, ...) _NM_IN_SET_EVAL_N(|, x, NM_NARG (__VA_ARGS__), __VA_ARGS__)
217 /********************************************************/
219 static inline gboolean
220 _NM_IN_STRSET_streq (const char *x, const char *s)
222 return s && strcmp (x, s) == 0;
225 #define _NM_IN_STRSET_EVAL_1(op, _x, y1) \
226 _NM_IN_STRSET_streq (_x, y1)
228 #define _NM_IN_STRSET_EVAL_2(op, _x, y1, y2) \
229 ( _NM_IN_STRSET_streq (_x, y1) \
230 op _NM_IN_STRSET_streq (_x, y2) \
233 #define _NM_IN_STRSET_EVAL_3(op, _x, y1, y2, y3) \
234 ( _NM_IN_STRSET_streq (_x, y1) \
235 op _NM_IN_STRSET_streq (_x, y2) \
236 op _NM_IN_STRSET_streq (_x, y3) \
239 #define _NM_IN_STRSET_EVAL_4(op, _x, y1, y2, y3, y4) \
240 ( _NM_IN_STRSET_streq (_x, y1) \
241 op _NM_IN_STRSET_streq (_x, y2) \
242 op _NM_IN_STRSET_streq (_x, y3) \
243 op _NM_IN_STRSET_streq (_x, y4) \
246 #define _NM_IN_STRSET_EVAL_5(op, _x, y1, y2, y3, y4, y5) \
247 ( _NM_IN_STRSET_streq (_x, y1) \
248 op _NM_IN_STRSET_streq (_x, y2) \
249 op _NM_IN_STRSET_streq (_x, y3) \
250 op _NM_IN_STRSET_streq (_x, y4) \
251 op _NM_IN_STRSET_streq (_x, y5) \
254 #define _NM_IN_STRSET_EVAL_6(op, _x, y1, y2, y3, y4, y5, y6) \
255 ( _NM_IN_STRSET_streq (_x, y1) \
256 op _NM_IN_STRSET_streq (_x, y2) \
257 op _NM_IN_STRSET_streq (_x, y3) \
258 op _NM_IN_STRSET_streq (_x, y4) \
259 op _NM_IN_STRSET_streq (_x, y5) \
260 op _NM_IN_STRSET_streq (_x, y6) \
263 #define _NM_IN_STRSET_EVAL_N2(op, _x, n, ...) _NM_IN_STRSET_EVAL_##n(op, _x, __VA_ARGS__)
264 #define _NM_IN_STRSET_EVAL_N(op, x, n, ...) \
266 const char *_x = (x); \
267 ( ((_x == NULL) && _NM_IN_SET_EVAL_N2 (op, (const char *) NULL, n, __VA_ARGS__)) \
268 || ((_x != NULL) && _NM_IN_STRSET_EVAL_N2 (op, _x, n, __VA_ARGS__)) \
272 /* Beware that this does short-circuit evaluation (use "||" instead of "|")
273 * which has a possibly unexpected non-function-like behavior.
274 * Use NM_IN_STRSET_SE if you need all arguments to be evaluted. */
275 #define NM_IN_STRSET(x, ...) _NM_IN_STRSET_EVAL_N(||, x, NM_NARG (__VA_ARGS__), __VA_ARGS__)
277 /* "SE" stands for "side-effect". Contrary to NM_IN_STRSET(), this does not do
278 * short-circuit evaluation, which can make a difference if the arguments have
280 #define NM_IN_STRSET_SE(x, ...) _NM_IN_STRSET_EVAL_N(|, x, NM_NARG (__VA_ARGS__), __VA_ARGS__)
282 /*****************************************************************************/
284 #define nm_streq(s1, s2) (strcmp (s1, s2) == 0)
285 #define nm_streq0(s1, s2) (g_strcmp0 (s1, s2) == 0)
287 /*****************************************************************************/
289 #define NM_PRINT_FMT_QUOTED(cond, prefix, str, suffix, str_else) \
290 (cond) ? (prefix) : "", \
291 (cond) ? (str) : (str_else), \
292 (cond) ? (suffix) : ""
293 #define NM_PRINT_FMT_QUOTE_STRING(arg) NM_PRINT_FMT_QUOTED((arg), "\"", (arg), "\"", "(null)")
295 /*****************************************************************************/
298 #define nm_assert(cond) G_STMT_START { g_assert (cond); } G_STMT_END
299 #define nm_assert_not_reached() G_STMT_START { g_assert_not_reached (); } G_STMT_END
301 #define nm_assert(cond) G_STMT_START { if (FALSE) { if (cond) { } } } G_STMT_END
302 #define nm_assert_not_reached() G_STMT_START { ; } G_STMT_END
305 /*****************************************************************************/
307 #define NM_GOBJECT_PROPERTIES_DEFINE_BASE(...) \
311 _PROPERTY_ENUMS_LAST, \
313 static GParamSpec *obj_properties[_PROPERTY_ENUMS_LAST] = { NULL, }
315 #define NM_GOBJECT_PROPERTIES_DEFINE(obj_type, ...) \
316 NM_GOBJECT_PROPERTIES_DEFINE_BASE (__VA_ARGS__); \
318 _notify (obj_type *obj, _PropertyEnums prop) \
320 nm_assert (G_IS_OBJECT (obj)); \
321 nm_assert ((gsize) prop < G_N_ELEMENTS (obj_properties)); \
322 g_object_notify_by_pspec ((GObject *) obj, obj_properties[prop]); \
325 /*****************************************************************************/
327 #define nm_unauto(pp) \
329 G_STATIC_ASSERT (sizeof *(pp) == sizeof (gpointer)); \
330 gpointer *_pp = (gpointer *) (pp); \
331 gpointer _p = *_pp; \
337 /*****************************************************************************/
339 static inline gpointer
340 nm_g_object_ref (gpointer obj)
342 /* g_object_ref() doesn't accept NULL. */
349 nm_g_object_unref (gpointer obj)
351 /* g_object_unref() doesn't accept NULL. Usully, we workaround that
352 * by using g_clear_object(), but sometimes that is not convinient
353 * (for example as as destroy function for a hash table that can contain
356 g_object_unref (obj);
359 static inline gboolean
360 nm_clear_g_source (guint *id)
363 g_source_remove (*id);
370 static inline gboolean
371 nm_clear_g_signal_handler (gpointer self, gulong *id)
374 g_signal_handler_disconnect (self, *id);
381 static inline gboolean
382 nm_clear_g_variant (GVariant **variant)
384 if (variant && *variant) {
385 g_variant_unref (*variant);
392 static inline gboolean
393 nm_clear_g_cancellable (GCancellable **cancellable)
395 if (cancellable && *cancellable) {
396 g_cancellable_cancel (*cancellable);
397 g_object_unref (*cancellable);
404 /*****************************************************************************/
406 /* Determine whether @x is a power of two (@x being an integer type).
407 * For the special cases @x equals zero or one, it also returns true.
408 * For negative @x, always returns FALSE. That only applies, if the data
409 * type of @x is signed. */
410 #define nm_utils_is_power_of_two(x) ({ \
411 typeof(x) __x = (x); \
413 /* Check if the value is negative. In that case, return FALSE.
414 * The first expression is a compile time constant, depending on whether
415 * the type is signed. The second expression is a clumsy way for (__x >= 0),
416 * which causes a compiler warning for unsigned types. */ \
417 ( ( ((typeof(__x)) -1) > ((typeof(__x)) 0) ) || (__x > 0) || (__x == 0) ) \
418 && ((__x & (__x - 1)) == 0); \
421 /*****************************************************************************/
423 /* check if @flags has exactly one flag (@check) set. You should call this
424 * only with @check being a compile time constant and a power of two. */
425 #define NM_FLAGS_HAS(flags, check) \
426 ( (G_STATIC_ASSERT_EXPR ( ((check) != 0) && ((check) & ((check)-1)) == 0 )), (NM_FLAGS_ANY ((flags), (check))) )
428 #define NM_FLAGS_ANY(flags, check) ( ( ((flags) & (check)) != 0 ) ? TRUE : FALSE )
429 #define NM_FLAGS_ALL(flags, check) ( ( ((flags) & (check)) == (check) ) ? TRUE : FALSE )
431 #define NM_FLAGS_SET(flags, val) ({ \
432 const typeof(flags) _flags = (flags); \
433 const typeof(flags) _val = (val); \
438 #define NM_FLAGS_UNSET(flags, val) ({ \
439 const typeof(flags) _flags = (flags); \
440 const typeof(flags) _val = (val); \
445 #define NM_FLAGS_ASSIGN(flags, val, assign) ({ \
446 const typeof(flags) _flags = (flags); \
447 const typeof(flags) _val = (val); \
451 : _flags & (~_val); \
454 /*****************************************************************************/
456 #define _NM_BACKPORT_SYMBOL_IMPL(VERSION, RETURN_TYPE, ORIG_FUNC, VERSIONED_FUNC, ARGS_TYPED, ARGS) \
457 RETURN_TYPE VERSIONED_FUNC ARGS_TYPED; \
458 RETURN_TYPE VERSIONED_FUNC ARGS_TYPED \
460 return ORIG_FUNC ARGS; \
462 RETURN_TYPE ORIG_FUNC ARGS_TYPED; \
463 __asm__(".symver "G_STRINGIFY(VERSIONED_FUNC)", "G_STRINGIFY(ORIG_FUNC)"@"G_STRINGIFY(VERSION))
465 #define NM_BACKPORT_SYMBOL(VERSION, RETURN_TYPE, FUNC, ARGS_TYPED, ARGS) \
466 _NM_BACKPORT_SYMBOL_IMPL(VERSION, RETURN_TYPE, FUNC, _##FUNC##_##VERSION, ARGS_TYPED, ARGS)
468 /*****************************************************************************/
471 nm_strstrip (char *str)
473 /* g_strstrip doesn't like NULL. */
474 return str ? g_strstrip (str) : NULL;
477 /*****************************************************************************/
480 nm_encode_version (guint major, guint minor, guint micro) {
481 /* analog to the preprocessor macro NM_ENCODE_VERSION(). */
482 return (major << 16) | (minor << 8) | micro;
486 nm_decode_version (guint version, guint *major, guint *minor, guint *micro) {
487 *major = (version & 0xFFFF0000u) >> 16;
488 *minor = (version & 0x0000FF00u) >> 8;
489 *micro = (version & 0x000000FFu);
491 /*****************************************************************************/
493 #define nm_sprintf_buf(buf, format, ...) ({ \
494 char * _buf = (buf); \
496 /* some static assert trying to ensure that the buffer is statically allocated.
497 * It disallows a buffer size of sizeof(gpointer) to catch that. */ \
498 G_STATIC_ASSERT (G_N_ELEMENTS (buf) == sizeof (buf) && sizeof (buf) != sizeof (char *)); \
499 g_snprintf (_buf, sizeof (buf), \
500 ""format"", ##__VA_ARGS__); \
504 #define nm_sprintf_bufa(n_elements, format, ...) \
508 G_STATIC_ASSERT (sizeof (char[MAX ((n_elements), 1)]) == (n_elements)); \
509 _buf = g_alloca (n_elements); \
510 g_snprintf (_buf, n_elements, \
511 ""format"", ##__VA_ARGS__); \
515 /*****************************************************************************/
518 * The boolean type _Bool is C99 while we mostly stick to C89. However, _Bool is too
519 * convinient to miss and is effectively available in gcc and clang. So, just use it.
521 * Usually, one would include "stdbool.h" to get the "bool" define which aliases
522 * _Bool. We provide this define here, because we want to make use of it anywhere.
523 * (also, stdbool.h is again C99).
525 * Using _Bool has advantages over gboolean:
527 * - commonly _Bool is one byte large, instead of gboolean's 4 bytes (because gboolean
528 * is a typedef for gint). Especially when having boolean fields in a struct, we can
529 * thereby easily save some space.
531 * - _Bool type guarantees that two "true" expressions compare equal. E.g. the follwing
535 * g_assert_cmpint (v1, ==, v2); // will fail
536 * For that, we often to use !! to coerce gboolean values to 0 or 1:
537 * g_assert_cmpint (!!v2, ==, TRUE);
538 * With _Bool type, this will be handled properly by the compiler.
540 * - For structs, we might want to safe even more space and use bitfields:
544 * But the problem here is that gboolean is signed, so that
545 * v1 will be either 0 or -1 (not 1, TRUE). Thus, the following
547 * struct s1 s = { .v1 = TRUE, };
548 * g_assert_cmpint (s1.v1, ==, TRUE);
549 * It will however work just fine with bool/_Bool while retaining the
550 * notion of having a boolean value.
552 * Also, add the defines for "true" and "false". Those are nicely highlighted by the editor
553 * as special types, contrary to glib's "TRUE"/"FALSE".
562 /*****************************************************************************/
564 #endif /* __NM_MACROS_INTERNAL_H__ */