defs.h

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/* Simple Plugin API
 *
 * Copyright © 2018 Wim Taymans
 *
 * 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 (including the next
 * paragraph) 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.
 */

#ifndef SPA_UTILS_DEFS_H
#define SPA_UTILS_DEFS_H

#ifdef __cplusplus
extern "C" {
# if __cplusplus >= 201103L
#  define SPA_STATIC_ASSERT static_assert
# endif
#else
# include <stdbool.h>
# if __STDC_VERSION__ >= 201112L
#  define SPA_STATIC_ASSERT _Static_assert
# endif
#endif
#ifndef SPA_STATIC_ASSERT
#define SPA_STATIC_ASSERT(a, b)                                         \
        ((void)sizeof(struct { int spa_static_assertion_failed : 2 * !!(a) - 1; }))
#endif
#include <inttypes.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <stdio.h>

#if defined(__clang__) && defined(__cplusplus) && __cplusplus >= 201103L
   /* clang's fallthrough annotations are only available starting in C++11. */
#  define SPA_FALLTHROUGH [[clang::fallthrough]];
#elif __GNUC__ >= 7 || __clang_major__ >= 10
#  define SPA_FALLTHROUGH __attribute__ ((fallthrough));
#else
#  define SPA_FALLTHROUGH /* FALLTHROUGH */
#endif

#define SPA_FLAG_MASK(field,mask,flag)  (((field) & (mask)) == (flag))
#define SPA_FLAG_IS_SET(field,flag)     SPA_FLAG_MASK(field,flag,flag)
#define SPA_FLAG_SET(field,flag)        ((field) |= (flag))
#define SPA_FLAG_CLEAR(field, flag)                                     \
({                                                                      \
        SPA_STATIC_ASSERT(__builtin_constant_p(flag) ?                  \
                      (__typeof__(flag))(__typeof__(field))(__typeof__(flag))(flag) == (flag) : \
                      sizeof(field) >= sizeof(flag),                    \
                        "truncation problem when masking " #field       \
                        " with ~" #flag);                               \
        ((field) &= ~(__typeof__(field))(flag));                        \
})
#define SPA_FLAG_UPDATE(field,flag,val) ((val) ? SPA_FLAG_SET((field),(flag)) : SPA_FLAG_CLEAR((field),(flag)))

enum spa_direction {
        SPA_DIRECTION_INPUT = 0,
        SPA_DIRECTION_OUTPUT = 1,
};

#define SPA_DIRECTION_REVERSE(d)        ((d) ^ 1)

#define SPA_RECTANGLE(width,height) ((struct spa_rectangle){ (width), (height) })
struct spa_rectangle {
        uint32_t width;
        uint32_t height;
};

#define SPA_POINT(x,y) ((struct spa_point){ (x), (y) })
struct spa_point {
        int32_t x;
        int32_t y;
};

#define SPA_REGION(x,y,width,height) ((struct spa_region){ SPA_POINT(x,y), SPA_RECTANGLE(width,height) })
struct spa_region {
        struct spa_point position;
        struct spa_rectangle size;
};

#define SPA_FRACTION(num,denom) ((struct spa_fraction){ (num), (denom) })
struct spa_fraction {
        uint32_t num;
        uint32_t denom;
};

#define SPA_N_ELEMENTS(arr)  (sizeof(arr) / sizeof((arr)[0]))

#define SPA_FOR_EACH_ELEMENT(arr, ptr) \
        for ((ptr) = arr; (void*)(ptr) < SPA_PTROFF(arr, sizeof(arr), void); (ptr)++)

#define SPA_ABS(a)                      \
({                                      \
        __typeof__(a) _a = (a);         \
        SPA_LIKELY(_a >= 0) ? _a : -_a; \
})
#define SPA_MIN(a,b)            \
({                              \
        __typeof__(a) _min_a = (a);     \
        __typeof__(b) _min_b = (b);     \
        SPA_LIKELY(_min_a <= _min_b) ? _min_a : _min_b; \
})
#define SPA_MAX(a,b)            \
({                              \
        __typeof__(a) _max_a = (a);     \
        __typeof__(b) _max_b = (b);     \
        SPA_LIKELY(_max_a >= _max_b) ? _max_a : _max_b; \
})
#define SPA_CLAMP(v,low,high)                           \
({                                                      \
        __typeof__(v) _v = (v);                         \
        __typeof__(low) _low = (low);                   \
        __typeof__(high) _high = (high);                \
        SPA_MIN(SPA_MAX(_v, _low), _high);              \
})

#define SPA_CLAMPF(v,low,high)                          \
({                                                      \
        fminf(fmaxf(v, low), high);                     \
})


#define SPA_SWAP(a,b)                                   \
({                                                      \
        __typeof__(a) _t = (a);                         \
        (a) = b; (b) = _t;                                      \
})

#define SPA_TYPECHECK(type,x)           \
({      type _dummy;                    \
        typeof(x) _dummy2;              \
        (void)(&_dummy == &_dummy2);    \
        x;                              \
})

#define SPA_PTROFF(ptr_,offset_,type_) ((type_*)((uintptr_t)(ptr_) + (ptrdiff_t)(offset_)))
#define SPA_PTROFF_ALIGN(ptr_,offset_,alignment_,type_) \
   SPA_PTR_ALIGN(SPA_PTROFF(ptr_,offset_,type_),alignment_,type_)


#define SPA_MEMBER(b,o,t) SPA_PTROFF(b,o,t)
#define SPA_MEMBER_ALIGN(b,o,a,t) SPA_PTROFF_ALIGN(b,o,a,t)

#define SPA_CONTAINER_OF(p,t,m) ((t*)((uintptr_t)(p) - offsetof(t,m)))

#define SPA_PTRDIFF(p1,p2) ((intptr_t)(p1) - (intptr_t)(p2))

#define SPA_PTR_TO_INT(p) ((int) ((intptr_t) (p)))
#define SPA_INT_TO_PTR(u) ((void*) ((intptr_t) (u)))

#define SPA_PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
#define SPA_UINT32_TO_PTR(u) ((void*) ((uintptr_t) (u)))

#define SPA_TIME_INVALID  ((int64_t)INT64_MIN)
#define SPA_IDX_INVALID  ((unsigned int)-1)
#define SPA_ID_INVALID  ((uint32_t)0xffffffff)

#define SPA_NSEC_PER_SEC  (1000000000LL)
#define SPA_NSEC_PER_MSEC (1000000ll)
#define SPA_NSEC_PER_USEC (1000ll)
#define SPA_USEC_PER_SEC  (1000000ll)
#define SPA_USEC_PER_MSEC (1000ll)
#define SPA_MSEC_PER_SEC  (1000ll)

#define SPA_TIMESPEC_TO_NSEC(ts) ((ts)->tv_sec * SPA_NSEC_PER_SEC + (ts)->tv_nsec)
#define SPA_TIMESPEC_TO_USEC(ts) ((ts)->tv_sec * SPA_USEC_PER_SEC + (ts)->tv_nsec / SPA_NSEC_PER_USEC)
#define SPA_TIMEVAL_TO_NSEC(tv)  ((tv)->tv_sec * SPA_NSEC_PER_SEC + (tv)->tv_usec * SPA_NSEC_PER_USEC)
#define SPA_TIMEVAL_TO_USEC(tv)  ((tv)->tv_sec * SPA_USEC_PER_SEC + (tv)->tv_usec)

#ifdef __GNUC__
#define SPA_PRINTF_FUNC(fmt, arg1) __attribute__((format(printf, fmt, arg1)))
#define SPA_FORMAT_ARG_FUNC(arg1) __attribute__((format_arg(arg1)))
#define SPA_ALIGNED(align) __attribute__((aligned(align)))
#define SPA_DEPRECATED __attribute__ ((deprecated))
#define SPA_EXPORT __attribute__((visibility("default")))
#define SPA_SENTINEL __attribute__((__sentinel__))
#define SPA_UNUSED __attribute__ ((unused))
#define SPA_NORETURN __attribute__ ((noreturn))
#define SPA_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
#else
#define SPA_PRINTF_FUNC(fmt, arg1)
#define SPA_FORMAT_ARG_FUNC(arg1)
#define SPA_ALIGNED(align)
#define SPA_DEPRECATED
#define SPA_EXPORT
#define SPA_SENTINEL
#define SPA_UNUSED
#define SPA_NORETURN
#define SPA_WARN_UNUSED_RESULT
#endif

#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#define SPA_RESTRICT restrict
#elif defined(__GNUC__) && __GNUC__ >= 4
#define SPA_RESTRICT __restrict__
#else
#define SPA_RESTRICT
#endif

#define SPA_ROUND_DOWN(num,value)       ((num) - ((num) % (value)))
#define SPA_ROUND_UP(num,value)         ((((num) + (value) - 1) / (value)) * (value))

#define SPA_MASK_NEGATED(num1, num2)                                    \
({                                                                      \
        SPA_STATIC_ASSERT(__builtin_constant_p(num2) ?                  \
                      (__typeof__(num2))(__typeof__(num1))(__typeof__(num2))(num2) == (num2) : \
                      sizeof(num1) >= sizeof(num2),                     \
                        "truncation problem when masking " #num1        \
                        " with ~" #num2);                               \
        ((num1) & ~(__typeof__(num1))(num2));                           \
})

#define SPA_ROUND_DOWN_N(num,align)     SPA_MASK_NEGATED((num), (align) - 1)
#define SPA_ROUND_UP_N(num,align)       SPA_ROUND_DOWN_N((num) + ((align) - 1),align)

#define SPA_PTR_ALIGNMENT(p,align)      ((intptr_t)(p) & ((align)-1))
#define SPA_IS_ALIGNED(p,align)         (SPA_PTR_ALIGNMENT(p,align) == 0)
#define SPA_PTR_ALIGN(p,align,type)     ((type*)SPA_ROUND_UP_N((intptr_t)(p), (intptr_t)(align)))

#ifndef SPA_LIKELY
#ifdef __GNUC__
#define SPA_LIKELY(x) (__builtin_expect(!!(x),1))
#define SPA_UNLIKELY(x) (__builtin_expect(!!(x),0))
#else
#define SPA_LIKELY(x) (x)
#define SPA_UNLIKELY(x) (x)
#endif
#endif

#define SPA_STRINGIFY_1(...)    #__VA_ARGS__
#define SPA_STRINGIFY(...)      SPA_STRINGIFY_1(__VA_ARGS__)

#define spa_return_if_fail(expr)                                        \
        do {                                                            \
                if (SPA_UNLIKELY(!(expr))) {                            \
                        fprintf(stderr, "'%s' failed at %s:%u %s()\n",  \
                                #expr , __FILE__, __LINE__, __func__);  \
                        return;                                         \
                }                                                       \
        } while(false)

#define spa_return_val_if_fail(expr, val)                               \
        do {                                                            \
                if (SPA_UNLIKELY(!(expr))) {                            \
                        fprintf(stderr, "'%s' failed at %s:%u %s()\n",  \
                                #expr , __FILE__, __LINE__, __func__);  \
                        return (val);                                   \
                }                                                       \
        } while(false)

/* spa_assert_se() is an assert which guarantees side effects of x,
 * i.e. is never optimized away, regardless of NDEBUG or FASTPATH. */
#ifndef __COVERITY__
#define spa_assert_se(expr)                                             \
        do {                                                            \
                if (SPA_UNLIKELY(!(expr))) {                            \
                        fprintf(stderr, "'%s' failed at %s:%u %s()\n",  \
                                #expr , __FILE__, __LINE__, __func__);  \
                        abort();                                        \
                }                                                       \
        } while (false)
#else
#define spa_assert_se(expr)                                             \
        do {                                                            \
                int _unique_var = (expr);                               \
                if (!_unique_var)                                       \
                        abort();                                        \
                } while (false)
#endif

/* Does exactly nothing */
#define spa_nop() do {} while (false)

#ifdef NDEBUG
#define spa_assert(expr) spa_nop()
#elif defined (FASTPATH)
#define spa_assert(expr) spa_assert_se(expr)
#else
#define spa_assert(expr) spa_assert_se(expr)
#endif

#ifdef NDEBUG
#define spa_assert_not_reached() abort()
#else
#define spa_assert_not_reached()                                                \
        do {                                                                    \
                fprintf(stderr, "Code should not be reached at %s:%u %s()\n",   \
                                __FILE__, __LINE__, __func__);                  \
                abort();                                                        \
        } while (false)
#endif

#define spa_memzero(x,l) (memset((x), 0, (l)))
#define spa_zero(x) (spa_memzero(&(x), sizeof(x)))

#ifdef SPA_DEBUG_MEMCPY
#define spa_memcpy(d,s,n)                                               \
({                                                                      \
        fprintf(stderr, "%s:%u %s() memcpy(%p, %p, %zd)\n",             \
                __FILE__, __LINE__, __func__, (d), (s), (size_t)(n));   \
        memcpy(d,s,n);                                                  \
})
#define spa_memmove(d,s,n)                                              \
({                                                                      \
        fprintf(stderr, "%s:%u %s() memmove(%p, %p, %zd)\n",            \
                __FILE__, __LINE__, __func__, (d), (s), (size_t)(n));   \
        memmove(d,s,n);                                                 \
})
#else
#define spa_memcpy(d,s,n)       memcpy(d,s,n)
#define spa_memmove(d,s,n)      memmove(d,s,n)
#endif

#define spa_aprintf(_fmt, ...)                                          \
({                                                                      \
        char *_strp;                                                    \
        if (asprintf(&(_strp), (_fmt), ## __VA_ARGS__ ) == -1)          \
                _strp = NULL;                                           \
        _strp;                                                          \
})

#ifdef __cplusplus
} /* extern "C" */
#endif

#endif /* SPA_UTILS_DEFS_H */