1 /*****************************************************************************
2 * vlc_common.h: common definitions
3 * Collection of useful common types and macros definitions
4 *****************************************************************************
5 * Copyright (C) 1998-2011 VLC authors and VideoLAN
7 * Authors: Samuel Hocevar <sam@via.ecp.fr>
8 * Vincent Seguin <seguin@via.ecp.fr>
9 * Gildas Bazin <gbazin@videolan.org>
10 * RĂ©mi Denis-Courmont
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
28 # define VLC_COMMON_H 1
31 * \defgroup vlc VLC plug-in programming interface
34 * This file is a collection of common definitions and types
37 /*****************************************************************************
38 * Required vlc headers
39 *****************************************************************************/
40 #include "vlc_config.h"
42 /*****************************************************************************
43 * Required system headers
44 *****************************************************************************/
58 * \defgroup cext C programming language extensions
61 * This section defines a number of macros and inline functions extending the
62 * C language. Most extensions are implemented by GCC and LLVM/Clang, and have
63 * unoptimized fallbacks for other C11/C++11 conforming compilers.
67 # define VLC_GCC_VERSION(maj,min) \
68 ((__GNUC__ > (maj)) || (__GNUC__ == (maj) && __GNUC_MINOR__ >= (min)))
70 /** GCC version check */
71 # define VLC_GCC_VERSION(maj,min) (0)
74 /* Try to fix format strings for all versions of mingw and mingw64 */
75 #if defined( _WIN32 ) && defined( __USE_MINGW_ANSI_STDIO )
86 #define snprintf __mingw_snprintf
87 #define vsnprintf __mingw_vsnprintf
88 #define swprintf _snwprintf
91 /* Function attributes for compiler warnings */
93 # define VLC_DEPRECATED __attribute__((deprecated))
94 # if VLC_GCC_VERSION(6,0)
95 # define VLC_DEPRECATED_ENUM __attribute__((deprecated))
97 # define VLC_DEPRECATED_ENUM
100 # if defined( _WIN32 ) && !defined( __clang__ )
101 # define VLC_FORMAT(x,y) __attribute__ ((format(gnu_printf,x,y)))
103 # define VLC_FORMAT(x,y) __attribute__ ((format(printf,x,y)))
105 # define VLC_FORMAT_ARG(x) __attribute__ ((format_arg(x)))
106 # define VLC_MALLOC __attribute__ ((malloc))
107 # define VLC_USED __attribute__ ((warn_unused_result))
111 * Deprecated functions or compound members annotation
113 * Use this macro in front of a function declaration or compound member
114 * within a compound type declaration.
115 * The compiler may emit a warning every time the function or member is used.
117 * Use \ref VLC_DEPRECATED_ENUM instead for enumeration members.
119 # define VLC_DEPRECATED
122 * Deprecated enum member annotation
124 * Use this macro after an enumerated type member declaration.
125 * The compiler may emit a warning every time the enumeration member is used.
127 * See also \ref VLC_DEPRECATED.
129 # define VLC_DEPRECATED_ENUM
132 * String format function annotation
134 * Use this macro after a function prototype/declaration if the function
135 * expects a standard C format string. This helps compiler diagnostics.
137 * @param x the position (starting from 1) of the format string argument
138 * @param y the first position (also starting from 1) of the variable arguments
139 * following the format string (usually but not always \p x+1).
141 # define VLC_FORMAT(x,y)
144 * Format string translation function annotation
146 * Use this macro after a function prototype/declaration if the function
147 * expects a format string as input and returns another format string as output
148 * to another function.
150 * This is primarily intended for localization functions such as gettext().
152 # define VLC_FORMAT_ARG(x)
155 * Heap allocated result function annotation
157 * Use this macro to annotate a function that returns a pointer to memory that
158 * cannot alias any other valid pointer.
160 * This is primarily used for functions that return a pointer to heap-allocated
161 * memory, but it can be used for other applicable purposes.
163 * \warning Do not use this annotation if the returned pointer can in any way
164 * alias a valid pointer at the time the function exits. This could lead to
165 * very weird memory corruption bugs.
170 * Used result function annotation
172 * Use this macro to annotate a function whose result must be used.
174 * There are several cases where this is useful:
175 * - If a function has no side effects (or no useful side effects), such that
176 * the only useful purpose of calling said function is to obtain its
178 * - If ignoring the function return value would lead to a resource leak
179 * (including but not limited to a memory leak).
180 * - If a function cannot be used correctly without checking its return value.
181 * For instance, if the function can fail at any time.
183 * The compiler may warn if the return value of a function call is ignored.
189 # define VLC_WEAK __attribute__((weak))
192 * Weak symbol annotation
194 * Use this macro before an external identifier \b definition to mark it as a
195 * weak symbol. A weak symbol can be overriden by another symbol of the same
196 * name at the link time.
201 /* Branch prediction */
202 #if defined (__GNUC__) || defined (__clang__)
203 # define likely(p) __builtin_expect(!!(p), 1)
204 # define unlikely(p) __builtin_expect(!!(p), 0)
205 # define unreachable() __builtin_unreachable()
208 * Predicted true condition
210 * This macro indicates that the condition is expected most often true.
211 * The compiler may optimize the code assuming that this condition is usually
214 # define likely(p) (!!(p))
217 * Predicted false condition
219 * This macro indicates that the condition is expected most often false.
220 * The compiler may optimize the code assuming that this condition is rarely
223 # define unlikely(p) (!!(p))
228 * This macro indicates that the branch cannot be reached at run-time, and
229 * represents undefined behaviour.
230 * The compiler may optimize the code assuming that the call flow will never
231 * logically reach the point where this macro is expanded.
233 * See also \ref vlc_assert_unreachable.
235 # define unreachable() ((void)0)
239 * Impossible branch assertion
241 * This macro asserts that the branch cannot be reached at run-time.
243 * If the branch is reached in a debug build, it will trigger an assertion
244 * failure and abnormal program termination.
246 * If the branch is reached in a non-debug build, this macro is equivalent to
247 * \ref unreachable and the behaviour is undefined.
249 #define vlc_assert_unreachable() (vlc_assert(!"unreachable"), unreachable())
254 * This macro performs a run-time assertion if C assertions are enabled
255 * and the following preprocessor symbol is defined:
256 * @verbatim __LIBVLC__ @endverbatim
257 * That restriction ensures that assertions in public header files are not
258 * unwittingly <i>leaked</i> to externally-compiled plug-ins
259 * including those header files.
261 * Within the LibVLC code base, this is exactly the same as assert(), which can
262 * and probably should be used directly instead.
265 # define vlc_assert(pred) assert(pred)
267 # define vlc_assert(pred) ((void)0)
272 # define VLC_EXTERN extern "C"
277 #if defined (_WIN32) && defined (DLL_EXPORT)
278 # define VLC_EXPORT __declspec(dllexport)
279 #elif defined (__GNUC__)
280 # define VLC_EXPORT __attribute__((visibility("default")))
286 * Exported API call annotation
288 * This macro is placed before a function declaration to indicate that the
289 * function is an API call of the LibVLC plugin API.
291 #define VLC_API VLC_EXTERN VLC_EXPORT
295 /*****************************************************************************
296 * Basic types definitions
297 *****************************************************************************/
299 * The vlc_fourcc_t type.
301 * See http://www.webartz.com/fourcc/ for a very detailed list.
303 typedef uint32_t vlc_fourcc_t
;
305 #ifdef WORDS_BIGENDIAN
306 # define VLC_FOURCC( a, b, c, d ) \
307 ( ((uint32_t)d) | ( ((uint32_t)c) << 8 ) \
308 | ( ((uint32_t)b) << 16 ) | ( ((uint32_t)a) << 24 ) )
309 # define VLC_TWOCC( a, b ) \
310 ( (uint16_t)(b) | ( (uint16_t)(a) << 8 ) )
313 # define VLC_FOURCC( a, b, c, d ) \
314 ( ((uint32_t)a) | ( ((uint32_t)b) << 8 ) \
315 | ( ((uint32_t)c) << 16 ) | ( ((uint32_t)d) << 24 ) )
316 # define VLC_TWOCC( a, b ) \
317 ( (uint16_t)(a) | ( (uint16_t)(b) << 8 ) )
322 * Translate a vlc_fourcc into its string representation. This function
323 * assumes there is enough room in psz_fourcc to store 4 characters in.
325 * \param fcc a vlc_fourcc_t
326 * \param psz_fourcc string to store string representation of vlc_fourcc in
328 static inline void vlc_fourcc_to_char( vlc_fourcc_t fcc
, char *psz_fourcc
)
330 memcpy( psz_fourcc
, &fcc
, 4 );
333 /*****************************************************************************
334 * Classes declaration
335 *****************************************************************************/
338 typedef struct vlc_object_t vlc_object_t
;
339 typedef struct libvlc_int_t libvlc_int_t
;
340 typedef struct date_t date_t
;
344 typedef struct playlist_t playlist_t
;
345 typedef struct playlist_item_t playlist_item_t
;
346 typedef struct services_discovery_t services_discovery_t
;
347 typedef struct vlc_renderer_discovery_t vlc_renderer_discovery_t
;
348 typedef struct vlc_renderer_item_t vlc_renderer_item_t
;
351 typedef struct module_t module_t
;
352 typedef struct module_config_t module_config_t
;
354 typedef struct config_category_t config_category_t
;
357 typedef struct input_thread_t input_thread_t
;
358 typedef struct input_item_t input_item_t
;
359 typedef struct input_item_node_t input_item_node_t
;
360 typedef struct stream_t stream_t
;
361 typedef struct stream_t demux_t
;
362 typedef struct es_out_t es_out_t
;
363 typedef struct es_out_id_t es_out_id_t
;
364 typedef struct seekpoint_t seekpoint_t
;
365 typedef struct info_t info_t
;
366 typedef struct info_category_t info_category_t
;
367 typedef struct input_attachment_t input_attachment_t
;
370 typedef struct audio_format_t audio_format_t
;
371 typedef struct video_format_t video_format_t
;
372 typedef struct subs_format_t subs_format_t
;
373 typedef struct es_format_t es_format_t
;
374 typedef struct video_palette_t video_palette_t
;
377 typedef struct audio_output audio_output_t
;
378 typedef audio_format_t audio_sample_format_t
;
381 typedef struct vout_thread_t vout_thread_t
;
382 typedef struct vlc_viewpoint_t vlc_viewpoint_t
;
384 typedef video_format_t video_frame_format_t
;
385 typedef struct picture_t picture_t
;
388 typedef struct spu_t spu_t
;
389 typedef struct subpicture_t subpicture_t
;
390 typedef struct subpicture_region_t subpicture_region_t
;
392 typedef struct image_handler_t image_handler_t
;
395 typedef struct sout_instance_t sout_instance_t
;
397 typedef struct sout_input_t sout_input_t
;
398 typedef struct sout_packetizer_input_t sout_packetizer_input_t
;
400 typedef struct sout_access_out_t sout_access_out_t
;
402 typedef struct sout_mux_t sout_mux_t
;
404 typedef struct sout_stream_t sout_stream_t
;
406 typedef struct config_chain_t config_chain_t
;
407 typedef struct session_descriptor_t session_descriptor_t
;
410 typedef struct decoder_t decoder_t
;
411 typedef struct decoder_synchro_t decoder_synchro_t
;
414 typedef struct encoder_t encoder_t
;
417 typedef struct filter_t filter_t
;
420 typedef struct vlc_url_t vlc_url_t
;
423 typedef struct iso639_lang_t iso639_lang_t
;
426 typedef struct block_t block_t
;
427 typedef struct block_fifo_t block_fifo_t
;
430 typedef struct md5_s md5_t
;
433 typedef struct xml_t xml_t
;
434 typedef struct xml_reader_t xml_reader_t
;
437 typedef struct vod_t vod_t
;
438 typedef struct vod_media_t vod_media_t
;
441 typedef struct vlm_t vlm_t
;
442 typedef struct vlm_message_t vlm_message_t
;
445 typedef struct vlc_meta_t vlc_meta_t
;
446 typedef struct input_stats_t input_stats_t
;
447 typedef struct addon_entry_t addon_entry_t
;
450 typedef struct update_t update_t
;
453 * VLC value structure
462 struct { int32_t x
; int32_t y
; } coords
;
466 /*****************************************************************************
467 * Error values (shouldn't be exposed)
468 *****************************************************************************/
469 #define VLC_SUCCESS (-0) /**< No error */
470 #define VLC_EGENERIC (-1) /**< Unspecified error */
471 #define VLC_ENOMEM (-2) /**< Not enough memory */
472 #define VLC_ETIMEOUT (-3) /**< Timeout */
473 #define VLC_ENOMOD (-4) /**< Module not found */
474 #define VLC_ENOOBJ (-5) /**< Object not found */
475 #define VLC_ENOVAR (-6) /**< Variable not found */
476 #define VLC_EBADVAR (-7) /**< Bad variable value */
477 #define VLC_ENOITEM (-8) /**< Item not found */
479 /*****************************************************************************
480 * Variable callbacks: called when the value is modified
481 *****************************************************************************/
482 typedef int ( * vlc_callback_t
) ( vlc_object_t
*, /* variable's object */
483 char const *, /* variable name */
484 vlc_value_t
, /* old value */
485 vlc_value_t
, /* new value */
486 void * ); /* callback data */
488 /*****************************************************************************
489 * List callbacks: called when elements are added/removed from the list
490 *****************************************************************************/
491 typedef int ( * vlc_list_callback_t
) ( vlc_object_t
*, /* variable's object */
492 char const *, /* variable name */
493 int, /* VLC_VAR_* action */
494 vlc_value_t
*, /* new/deleted value */
495 void *); /* callback data */
497 /*****************************************************************************
498 * OS-specific headers and thread types
499 *****************************************************************************/
500 #if defined( _WIN32 )
503 # define PATH_MAX MAX_PATH
505 # include <windows.h>
509 #include <sys/syslimits.h>
510 #include <AvailabilityMacros.h>
514 # define OS2EMX_PLAIN_CHAR
517 # include <os2safe.h>
521 #include "vlc_tick.h"
522 #include "vlc_threads.h"
525 * \defgroup intops Integer operations
528 * Common integer functions.
531 /* __MAX and __MIN: self explanatory */
533 # define __MAX(a, b) ( ((a) > (b)) ? (a) : (b) )
536 # define __MIN(a, b) ( ((a) < (b)) ? (a) : (b) )
539 /* clip v in [min, max] */
540 #define VLC_CLIP(v, min, max) __MIN(__MAX((v), (min)), (max))
542 /** Greatest common divisor */
544 static inline int64_t GCD ( int64_t a
, int64_t b
)
555 /* function imported from libavutil/common.h */
557 static inline uint8_t clip_uint8_vlc( int32_t a
)
559 if( a
&(~255) ) return (-a
)>>31;
564 * \defgroup bitops Bit operations
568 #define VLC_INT_FUNC(basename) \
569 VLC_INT_FUNC_TYPE(basename, unsigned, ) \
570 VLC_INT_FUNC_TYPE(basename, unsigned long, l) \
571 VLC_INT_FUNC_TYPE(basename, unsigned long long, ll)
573 #if defined (__GNUC__) || defined (__clang__)
574 # define VLC_INT_FUNC_TYPE(basename,type,suffix) \
575 VLC_USED static inline int vlc_##basename##suffix(type x) \
577 return __builtin_##basename##suffix(x); \
582 VLC_USED
static inline int vlc_clzll(unsigned long long x
)
584 int i
= sizeof (x
) * 8;
594 VLC_USED
static inline int vlc_clzl(unsigned long x
)
596 return vlc_clzll(x
) - ((sizeof (long long) - sizeof (long)) * 8);
599 VLC_USED
static inline int vlc_clz(unsigned x
)
601 return vlc_clzll(x
) - ((sizeof (long long) - sizeof (int)) * 8);
604 VLC_USED
static inline int vlc_ctz_generic(unsigned long long x
)
606 unsigned i
= sizeof (x
) * 8;
616 VLC_USED
static inline int vlc_parity_generic(unsigned long long x
)
618 for (unsigned i
= 4 * sizeof (x
); i
> 0; i
/= 2)
623 VLC_USED
static inline int vlc_popcount_generic(unsigned long long x
)
634 # define VLC_INT_FUNC_TYPE(basename,type,suffix) \
635 VLC_USED static inline int vlc_##basename##suffix(type x) \
637 return vlc_##basename##_generic(x); \
643 VLC_INT_FUNC(popcount
)
646 # define VLC_INT_GENERIC(func,x) \
648 unsigned char: func(x), \
649 signed char: func(x), \
650 unsigned short: func(x), \
651 signed short: func(x), \
652 unsigned int: func(x), \
653 signed int: func(x), \
654 unsigned long: func##l(x), \
655 signed long: func##l(x), \
656 unsigned long long: func##ll(x), \
657 signed long long: func##ll(x))
660 * Count leading zeroes
662 * This function counts the number of consecutive zero (clear) bits
663 * down from the highest order bit in an unsigned integer.
665 * \param x a non-zero integer
666 * \note This macro assumes that CHAR_BIT equals 8.
667 * \warning By definition, the result depends on the (width of the) type of x.
668 * \return The number of leading zero bits in x.
672 unsigned char: (vlc_clz(x) - (sizeof (unsigned) - 1) * 8), \
673 unsigned short: (vlc_clz(x) \
674 - (sizeof (unsigned) - sizeof (unsigned short)) * 8), \
675 unsigned: vlc_clz(x), \
676 unsigned long: vlc_clzl(x), \
677 unsigned long long: vlc_clzll(x))
680 * Count trailing zeroes
682 * This function counts the number of consecutive zero bits
683 * up from the lowest order bit in an unsigned integer.
685 * \param x a non-zero integer
686 * \note This function assumes that CHAR_BIT equals 8.
687 * \return The number of trailing zero bits in x.
689 # define ctz(x) VLC_INT_GENERIC(vlc_ctz, x)
694 * This function determines the parity of an integer.
695 * \retval 0 if x has an even number of set bits.
696 * \retval 1 if x has an odd number of set bits.
698 # define parity(x) VLC_INT_GENERIC(vlc_parity, x)
701 * Bit weight / population count
703 * This function counts the number of non-zero bits in an integer.
705 * \return The count of non-zero bits.
707 # define vlc_popcount(x) \
709 signed char: vlc_popcount((unsigned char)(x)), \
710 signed short: vlc_popcount((unsigned short)(x)), \
711 default: VLC_INT_GENERIC(vlc_popcount ,x))
713 VLC_USED
static inline int vlc_popcount(unsigned char x
)
715 return vlc_popcount((unsigned)x
);
718 VLC_USED
static inline int vlc_popcount(unsigned short x
)
720 return vlc_popcount((unsigned)x
);
723 VLC_USED
static inline int vlc_popcount(unsigned long x
)
725 return vlc_popcountl(x
);
728 VLC_USED
static inline int vlc_popcount(unsigned long long x
)
730 return vlc_popcountll(x
);
734 /** Byte swap (16 bits) */
736 static inline uint16_t vlc_bswap16(uint16_t x
)
738 return (x
<< 8) | (x
>> 8);
741 /** Byte swap (32 bits) */
743 static inline uint32_t vlc_bswap32(uint32_t x
)
745 #if defined (__GNUC__) || defined(__clang__)
746 return __builtin_bswap32 (x
);
748 return ((x
& 0x000000FF) << 24)
749 | ((x
& 0x0000FF00) << 8)
750 | ((x
& 0x00FF0000) >> 8)
751 | ((x
& 0xFF000000) >> 24);
755 /** Byte swap (64 bits) */
757 static inline uint64_t vlc_bswap64(uint64_t x
)
759 #if defined (__GNUC__) || defined(__clang__)
760 return __builtin_bswap64 (x
);
761 #elif !defined (__cplusplus)
762 return ((x
& 0x00000000000000FF) << 56)
763 | ((x
& 0x000000000000FF00) << 40)
764 | ((x
& 0x0000000000FF0000) << 24)
765 | ((x
& 0x00000000FF000000) << 8)
766 | ((x
& 0x000000FF00000000) >> 8)
767 | ((x
& 0x0000FF0000000000) >> 24)
768 | ((x
& 0x00FF000000000000) >> 40)
769 | ((x
& 0xFF00000000000000) >> 56);
771 return ((x
& 0x00000000000000FFULL
) << 56)
772 | ((x
& 0x000000000000FF00ULL
) << 40)
773 | ((x
& 0x0000000000FF0000ULL
) << 24)
774 | ((x
& 0x00000000FF000000ULL
) << 8)
775 | ((x
& 0x000000FF00000000ULL
) >> 8)
776 | ((x
& 0x0000FF0000000000ULL
) >> 24)
777 | ((x
& 0x00FF000000000000ULL
) >> 40)
778 | ((x
& 0xFF00000000000000ULL
) >> 56);
784 * \defgroup overflow Overflowing arithmetic
787 static inline bool uadd_overflow(unsigned a
, unsigned b
, unsigned *res
)
789 #if VLC_GCC_VERSION(5,0) || defined(__clang__)
790 return __builtin_uadd_overflow(a
, b
, res
);
797 static inline bool uaddl_overflow(unsigned long a
, unsigned long b
,
800 #if VLC_GCC_VERSION(5,0) || defined(__clang__)
801 return __builtin_uaddl_overflow(a
, b
, res
);
808 static inline bool uaddll_overflow(unsigned long long a
, unsigned long long b
,
809 unsigned long long *res
)
811 #if VLC_GCC_VERSION(5,0) || defined(__clang__)
812 return __builtin_uaddll_overflow(a
, b
, res
);
821 * Overflowing addition
823 * Converts \p a and \p b to the type of \p *r.
824 * Then computes the sum of both conversions while checking for overflow.
825 * Finally stores the result in \p *r.
827 * \param a an integer
828 * \param b an integer
829 * \param r a pointer to an integer [OUT]
830 * \retval false The sum did not overflow.
831 * \retval true The sum overflowed.
833 # define add_overflow(a,b,r) \
835 unsigned: uadd_overflow(a, b, (unsigned *)(r)), \
836 unsigned long: uaddl_overflow(a, b, (unsigned long *)(r)), \
837 unsigned long long: uaddll_overflow(a, b, (unsigned long long *)(r)))
839 static inline bool add_overflow(unsigned a
, unsigned b
, unsigned *res
)
841 return uadd_overflow(a
, b
, res
);
844 static inline bool add_overflow(unsigned long a
, unsigned long b
,
847 return uaddl_overflow(a
, b
, res
);
850 static inline bool add_overflow(unsigned long long a
, unsigned long long b
,
851 unsigned long long *res
)
853 return uaddll_overflow(a
, b
, res
);
857 #if !(VLC_GCC_VERSION(5,0) || defined(__clang__))
861 static inline bool umul_overflow(unsigned a
, unsigned b
, unsigned *res
)
863 #if VLC_GCC_VERSION(5,0) || defined(__clang__)
864 return __builtin_umul_overflow(a
, b
, res
);
867 return b
> 0 && a
> (UINT_MAX
/ b
);
871 static inline bool umull_overflow(unsigned long a
, unsigned long b
,
874 #if VLC_GCC_VERSION(5,0) || defined(__clang__)
875 return __builtin_umull_overflow(a
, b
, res
);
878 return b
> 0 && a
> (ULONG_MAX
/ b
);
882 static inline bool umulll_overflow(unsigned long long a
, unsigned long long b
,
883 unsigned long long *res
)
885 #if VLC_GCC_VERSION(5,0) || defined(__clang__)
886 return __builtin_umulll_overflow(a
, b
, res
);
889 return b
> 0 && a
> (ULLONG_MAX
/ b
);
895 * Overflowing multiplication
897 * Converts \p a and \p b to the type of \p *r.
898 * Then computes the product of both conversions while checking for overflow.
899 * Finally stores the result in \p *r.
901 * \param a an integer
902 * \param b an integer
903 * \param r a pointer to an integer [OUT]
904 * \retval false The product did not overflow.
905 * \retval true The product overflowed.
907 #define mul_overflow(a,b,r) \
909 unsigned: umul_overflow(a, b, (unsigned *)(r)), \
910 unsigned long: umull_overflow(a, b, (unsigned long *)(r)), \
911 unsigned long long: umulll_overflow(a, b, (unsigned long long *)(r)))
913 static inline bool mul_overflow(unsigned a
, unsigned b
, unsigned *res
)
915 return umul_overflow(a
, b
, res
);
918 static inline bool mul_overflow(unsigned long a
, unsigned long b
,
921 return umull_overflow(a
, b
, res
);
924 static inline bool mul_overflow(unsigned long long a
, unsigned long long b
,
925 unsigned long long *res
)
927 return umulll_overflow(a
, b
, res
);
933 /* Free and set set the variable to NULL */
934 #define FREENULL(a) do { free( a ); a = NULL; } while(0)
936 #define EMPTY_STR(str) (!str || !*str)
938 VLC_API
char const * vlc_error( int ) VLC_USED
;
940 #include <vlc_arrays.h>
942 /* MSB (big endian)/LSB (little endian) conversions - network order is always
943 * MSB, and should be used for both network communications and files. */
945 #ifdef WORDS_BIGENDIAN
946 # define hton16(i) ((uint16_t)(i))
947 # define hton32(i) ((uint32_t)(i))
948 # define hton64(i) ((uint64_t)(i))
950 # define hton16(i) vlc_bswap16(i)
951 # define hton32(i) vlc_bswap32(i)
952 # define hton64(i) vlc_bswap64(i)
954 #define ntoh16(i) hton16(i)
955 #define ntoh32(i) hton32(i)
956 #define ntoh64(i) hton64(i)
958 /** Reads 16 bits in network byte order */
960 static inline uint16_t U16_AT (const void *p
)
964 memcpy (&x
, p
, sizeof (x
));
968 /** Reads 32 bits in network byte order */
970 static inline uint32_t U32_AT (const void *p
)
974 memcpy (&x
, p
, sizeof (x
));
978 /** Reads 64 bits in network byte order */
980 static inline uint64_t U64_AT (const void *p
)
984 memcpy (&x
, p
, sizeof (x
));
988 #define GetWBE(p) U16_AT(p)
989 #define GetDWBE(p) U32_AT(p)
990 #define GetQWBE(p) U64_AT(p)
992 /** Reads 16 bits in little-endian order */
994 static inline uint16_t GetWLE (const void *p
)
998 memcpy (&x
, p
, sizeof (x
));
999 #ifdef WORDS_BIGENDIAN
1000 x
= vlc_bswap16 (x
);
1005 /** Reads 32 bits in little-endian order */
1007 static inline uint32_t GetDWLE (const void *p
)
1011 memcpy (&x
, p
, sizeof (x
));
1012 #ifdef WORDS_BIGENDIAN
1013 x
= vlc_bswap32 (x
);
1018 /** Reads 64 bits in little-endian order */
1020 static inline uint64_t GetQWLE (const void *p
)
1024 memcpy (&x
, p
, sizeof (x
));
1025 #ifdef WORDS_BIGENDIAN
1026 x
= vlc_bswap64 (x
);
1031 /** Writes 16 bits in network byte order */
1032 static inline void SetWBE (void *p
, uint16_t w
)
1035 memcpy (p
, &w
, sizeof (w
));
1038 /** Writes 32 bits in network byte order */
1039 static inline void SetDWBE (void *p
, uint32_t dw
)
1042 memcpy (p
, &dw
, sizeof (dw
));
1045 /** Writes 64 bits in network byte order */
1046 static inline void SetQWBE (void *p
, uint64_t qw
)
1049 memcpy (p
, &qw
, sizeof (qw
));
1052 /** Writes 16 bits in little endian order */
1053 static inline void SetWLE (void *p
, uint16_t w
)
1055 #ifdef WORDS_BIGENDIAN
1056 w
= vlc_bswap16 (w
);
1058 memcpy (p
, &w
, sizeof (w
));
1061 /** Writes 32 bits in little endian order */
1062 static inline void SetDWLE (void *p
, uint32_t dw
)
1064 #ifdef WORDS_BIGENDIAN
1065 dw
= vlc_bswap32 (dw
);
1067 memcpy (p
, &dw
, sizeof (dw
));
1070 /** Writes 64 bits in little endian order */
1071 static inline void SetQWLE (void *p
, uint64_t qw
)
1073 #ifdef WORDS_BIGENDIAN
1074 qw
= vlc_bswap64 (qw
);
1076 memcpy (p
, &qw
, sizeof (qw
));
1080 #define VLC_UNUSED(x) (void)(x)
1082 /* Stuff defined in src/extras/libc.c */
1085 /* several type definitions */
1086 # if defined( __MINGW32__ )
1087 # if !defined( _OFF_T_ )
1088 typedef long long _off_t
;
1089 typedef _off_t off_t
;
1095 # define off_t long long
1100 # define O_NONBLOCK 0
1110 VLC_API
bool vlc_ureduce( unsigned *, unsigned *, uint64_t, uint64_t, uint64_t );
1112 #define container_of(ptr, type, member) \
1113 ((type *)(((char *)(ptr)) - offsetof(type, member)))
1116 static inline void *vlc_alloc(size_t count
, size_t size
)
1118 return mul_overflow(count
, size
, &size
) ? NULL
: malloc(size
);
1121 /*****************************************************************************
1123 *****************************************************************************/
1124 VLC_API
const char *vlc_gettext(const char *msgid
) VLC_FORMAT_ARG(1);
1125 VLC_API
const char *vlc_ngettext(const char *s
, const char *p
, unsigned long n
)
1126 VLC_FORMAT_ARG(1) VLC_FORMAT_ARG(2);
1128 #define vlc_pgettext( ctx, id ) \
1129 vlc_pgettext_aux( ctx "\004" id, id )
1132 static inline const char *vlc_pgettext_aux( const char *ctx
, const char *id
)
1134 const char *tr
= vlc_gettext( ctx
);
1135 return (tr
== ctx
) ? id
: tr
;
1138 /*****************************************************************************
1139 * Loosy memory allocation functions. Do not use in new code.
1140 *****************************************************************************/
1141 static inline void *xmalloc(size_t len
)
1143 void *ptr
= malloc(len
);
1144 if (unlikely(ptr
== NULL
&& len
> 0))
1149 static inline void *xrealloc(void *ptr
, size_t len
)
1151 void *nptr
= realloc(ptr
, len
);
1152 if (unlikely(nptr
== NULL
&& len
> 0))
1157 static inline void *xcalloc(size_t n
, size_t size
)
1159 void *ptr
= calloc(n
, size
);
1160 if (unlikely(ptr
== NULL
&& (n
> 0 || size
> 0)))
1165 static inline char *xstrdup (const char *str
)
1167 char *ptr
= strdup (str
);
1168 if (unlikely(ptr
== NULL
))
1173 /*****************************************************************************
1175 *****************************************************************************/
1176 VLC_API
const char * VLC_CompileBy( void ) VLC_USED
;
1177 VLC_API
const char * VLC_CompileHost( void ) VLC_USED
;
1178 VLC_API
const char * VLC_Compiler( void ) VLC_USED
;
1180 /*****************************************************************************
1181 * Additional vlc stuff
1182 *****************************************************************************/
1183 #include "vlc_messages.h"
1184 #include "vlc_objects.h"
1185 #include "vlc_variables.h"
1186 #include "vlc_configuration.h"
1188 #if defined( _WIN32 ) || defined( __OS2__ )
1189 # define DIR_SEP_CHAR '\\'
1190 # define DIR_SEP "\\"
1191 # define PATH_SEP_CHAR ';'
1192 # define PATH_SEP ";"
1194 # define DIR_SEP_CHAR '/'
1195 # define DIR_SEP "/"
1196 # define PATH_SEP_CHAR ':'
1197 # define PATH_SEP ":"
1200 #define LICENSE_MSG \
1201 _("This program comes with NO WARRANTY, to the extent permitted by " \
1202 "law.\nYou may redistribute it under the terms of the GNU General " \
1203 "Public License;\nsee the file named COPYING for details.\n" \
1204 "Written by the VideoLAN team; see the AUTHORS file.\n")
1206 #endif /* !VLC_COMMON_H */