switch from typeof to the more portable __typeof__

[project/libubox.git] / utils.h

diff --git a/utils.h b/utils.h
index a86894a..b64b400 100644 (file)
--- a/utils.h
+++ b/utils.h
@@ -20,6 +20,11 @@
 #define __LIBUBOX_UTILS_H
 
 #include <sys/types.h>
+#include <sys/time.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <time.h>
 
 /*
  * calloc_a(size_t len, [void **addr, size_t len,...], NULL)
@@ -52,4 +57,159 @@ extern int __BUILD_BUG_ON_CONDITION_FAILED;
 #define BUILD_BUG_ON __BUILD_BUG_ON
 #endif
 
+#if defined(__APPLE__) && !defined(CLOCK_MONOTONIC)
+#define LIBUBOX_COMPAT_CLOCK_GETTIME
+
+#include <mach/clock_types.h>
+#define CLOCK_REALTIME CALENDAR_CLOCK
+#define CLOCK_MONOTONIC        SYSTEM_CLOCK
+
+int clock_gettime(int type, struct timespec *tv);
+
+#endif
+
+#ifdef __GNUC__
+#define _GNUC_MIN_VER(maj, min) (((__GNUC__ << 8) + __GNUC_MINOR__) >= (((maj) << 8) + (min)))
+#else
+#define _GNUC_MIN_VER(maj, min) 0
+#endif
+
+#if defined(__linux__) || defined(__CYGWIN__)
+#include <byteswap.h>
+#include <endian.h>
+
+#elif defined(__APPLE__)
+#include <machine/endian.h>
+#include <machine/byte_order.h>
+#elif defined(__FreeBSD__)
+#include <sys/endian.h>
+#else
+#include <machine/endian.h>
+#endif
+
+#ifndef __BYTE_ORDER
+#define __BYTE_ORDER BYTE_ORDER
+#endif
+#ifndef __BIG_ENDIAN
+#define __BIG_ENDIAN BIG_ENDIAN
+#endif
+#ifndef __LITTLE_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#endif
+
+#define __constant_swap16(x) ((uint16_t)(                              \
+       (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) |                    \
+       (((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
+
+#define __constant_swap32(x) ((uint32_t)(                              \
+       (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |              \
+       (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |              \
+       (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |              \
+       (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
+
+#define __constant_swap64(x) ((uint64_t)(                              \
+       (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) |     \
+       (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) |     \
+       (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) |     \
+       (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) |     \
+       (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) |     \
+       (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) |     \
+       (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) |     \
+       (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
+
+/*
+ * This returns a constant expression while determining if an argument is
+ * a constant expression, most importantly without evaluating the argument.
+ */
+#define __is_constant(x)                                               \
+       (sizeof(int) == sizeof(*(1 ? ((void*)((long)(x) * 0l)) : (int*)1)))
+
+#define __eval_once(func, x)                                           \
+       ({ __typeof__(x) __x = x; func(__x); })
+
+#define __eval_safe(func, x)                                           \
+       __builtin_choose_expr(__is_constant(x),                         \
+                             func(x), __eval_once(func, x))
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+
+#define cpu_to_be64(x) __eval_safe(__constant_swap64, x)
+#define cpu_to_be32(x) __eval_safe(__constant_swap32, x)
+#define cpu_to_be16(x) __eval_safe(__constant_swap16, x)
+
+#define be64_to_cpu(x) __eval_safe(__constant_swap64, x)
+#define be32_to_cpu(x) __eval_safe(__constant_swap32, x)
+#define be16_to_cpu(x) __eval_safe(__constant_swap16, x)
+
+#define cpu_to_le64(x) (x)
+#define cpu_to_le32(x) (x)
+#define cpu_to_le16(x) (x)
+
+#define le64_to_cpu(x) (x)
+#define le32_to_cpu(x) (x)
+#define le16_to_cpu(x) (x)
+
+#else /* __BYTE_ORDER == __LITTLE_ENDIAN */
+
+#define cpu_to_le64(x) __eval_safe(__constant_swap64, x)
+#define cpu_to_le32(x) __eval_safe(__constant_swap32, x)
+#define cpu_to_le16(x) __eval_safe(__constant_swap16, x)
+
+#define le64_to_cpu(x) __eval_safe(__constant_swap64, x)
+#define le32_to_cpu(x) __eval_safe(__constant_swap32, x)
+#define le16_to_cpu(x) __eval_safe(__constant_swap16, x)
+
+#define cpu_to_be64(x) (x)
+#define cpu_to_be32(x) (x)
+#define cpu_to_be16(x) (x)
+
+#define be64_to_cpu(x) (x)
+#define be32_to_cpu(x) (x)
+#define be16_to_cpu(x) (x)
+
+#endif
+
+#ifndef __packed
+#define __packed __attribute__((packed))
+#endif
+
+#ifndef __constructor
+#define __constructor __attribute__((constructor))
+#endif
+
+#ifndef __destructor
+#define __destructor __attribute__((destructor))
+#endif
+
+#ifndef __hidden
+#define __hidden __attribute__((visibility("hidden")))
+#endif
+
+int b64_encode(const void *src, size_t src_len,
+              void *dest, size_t dest_len);
+
+int b64_decode(const void *src, void *dest, size_t dest_len);
+
+#define B64_ENCODE_LEN(_len)   ((((_len) + 2) / 3) * 4 + 1)
+#define B64_DECODE_LEN(_len)   (((_len) / 4) * 3 + 1)
+
+static inline unsigned int cbuf_order(unsigned int x)
+{
+       return 32 - __builtin_clz(x - 1);
+}
+
+static inline unsigned long cbuf_size(int order)
+{
+       unsigned long page_size = sysconf(_SC_PAGESIZE);
+       unsigned long ret = 1ULL << order;
+
+       if (ret < page_size)
+               ret = page_size;
+
+       return ret;
+}
+
+void *cbuf_alloc(unsigned int order);
+void cbuf_free(void *ptr, unsigned int order);
+
 #endif