mirror of
https://github.com/daveallie/crosspoint-reader.git
synced 2026-02-04 14:47:37 +03:00
356 lines
7.8 KiB
C
356 lines
7.8 KiB
C
/*
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* C utilities
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*
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* Copyright (c) 2017 Fabrice Bellard
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* Copyright (c) 2018 Charlie Gordon
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef CUTILS_H
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#define CUTILS_H
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#include <stdlib.h>
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#include <inttypes.h>
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/* set if CPU is big endian */
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#undef WORDS_BIGENDIAN
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#define likely(x) __builtin_expect(!!(x), 1)
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#define unlikely(x) __builtin_expect(!!(x), 0)
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#define force_inline inline __attribute__((always_inline))
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#define no_inline __attribute__((noinline))
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#define __maybe_unused __attribute__((unused))
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#define xglue(x, y) x ## y
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#define glue(x, y) xglue(x, y)
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#define stringify(s) tostring(s)
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#define tostring(s) #s
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#ifndef offsetof
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#define offsetof(type, field) ((size_t) &((type *)0)->field)
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#endif
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#ifndef countof
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#define countof(x) (sizeof(x) / sizeof((x)[0]))
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#endif
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/* return the pointer of type 'type *' containing 'ptr' as field 'member' */
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#define container_of(ptr, type, member) ((type *)((uint8_t *)(ptr) - offsetof(type, member)))
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typedef int BOOL;
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#ifndef FALSE
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enum {
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FALSE = 0,
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TRUE = 1,
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};
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#endif
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void pstrcpy(char *buf, int buf_size, const char *str);
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char *pstrcat(char *buf, int buf_size, const char *s);
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int strstart(const char *str, const char *val, const char **ptr);
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int has_suffix(const char *str, const char *suffix);
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static inline int max_int(int a, int b)
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{
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if (a > b)
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return a;
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else
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return b;
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}
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static inline int min_int(int a, int b)
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{
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if (a < b)
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return a;
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else
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return b;
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}
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static inline uint32_t max_uint32(uint32_t a, uint32_t b)
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{
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if (a > b)
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return a;
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else
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return b;
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}
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static inline uint32_t min_uint32(uint32_t a, uint32_t b)
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{
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if (a < b)
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return a;
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else
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return b;
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}
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static inline int64_t max_int64(int64_t a, int64_t b)
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{
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if (a > b)
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return a;
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else
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return b;
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}
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static inline int64_t min_int64(int64_t a, int64_t b)
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{
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if (a < b)
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return a;
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else
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return b;
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}
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static inline size_t max_size_t(size_t a, size_t b)
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{
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if (a > b)
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return a;
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else
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return b;
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}
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static inline size_t min_size_t(size_t a, size_t b)
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{
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if (a < b)
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return a;
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else
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return b;
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}
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/* WARNING: undefined if a = 0 */
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static inline int clz32(unsigned int a)
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{
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return __builtin_clz(a);
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}
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/* WARNING: undefined if a = 0 */
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static inline int clz64(uint64_t a)
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{
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return __builtin_clzll(a);
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}
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/* WARNING: undefined if a = 0 */
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static inline int ctz32(unsigned int a)
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{
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return __builtin_ctz(a);
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}
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/* WARNING: undefined if a = 0 */
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static inline int ctz64(uint64_t a)
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{
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return __builtin_ctzll(a);
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}
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struct __attribute__((packed)) packed_u64 {
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uint64_t v;
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};
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struct __attribute__((packed)) packed_u32 {
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uint32_t v;
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};
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struct __attribute__((packed)) packed_u16 {
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uint16_t v;
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};
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static inline uint64_t get_u64(const uint8_t *tab)
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{
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return ((const struct packed_u64 *)tab)->v;
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}
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static inline int64_t get_i64(const uint8_t *tab)
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{
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return (int64_t)((const struct packed_u64 *)tab)->v;
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}
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static inline void put_u64(uint8_t *tab, uint64_t val)
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{
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((struct packed_u64 *)tab)->v = val;
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}
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static inline uint32_t get_u32(const uint8_t *tab)
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{
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return ((const struct packed_u32 *)tab)->v;
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}
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static inline int32_t get_i32(const uint8_t *tab)
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{
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return (int32_t)((const struct packed_u32 *)tab)->v;
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}
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static inline void put_u32(uint8_t *tab, uint32_t val)
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{
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((struct packed_u32 *)tab)->v = val;
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}
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static inline uint32_t get_u16(const uint8_t *tab)
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{
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return ((const struct packed_u16 *)tab)->v;
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}
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static inline int32_t get_i16(const uint8_t *tab)
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{
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return (int16_t)((const struct packed_u16 *)tab)->v;
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}
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static inline void put_u16(uint8_t *tab, uint16_t val)
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{
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((struct packed_u16 *)tab)->v = val;
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}
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static inline uint32_t get_u8(const uint8_t *tab)
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{
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return *tab;
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}
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static inline int32_t get_i8(const uint8_t *tab)
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{
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return (int8_t)*tab;
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}
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static inline void put_u8(uint8_t *tab, uint8_t val)
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{
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*tab = val;
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}
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static inline uint16_t bswap16(uint16_t x)
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{
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return (x >> 8) | (x << 8);
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}
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static inline uint32_t bswap32(uint32_t v)
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{
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return ((v & 0xff000000) >> 24) | ((v & 0x00ff0000) >> 8) |
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((v & 0x0000ff00) << 8) | ((v & 0x000000ff) << 24);
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}
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static inline uint64_t bswap64(uint64_t v)
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{
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return ((v & ((uint64_t)0xff << (7 * 8))) >> (7 * 8)) |
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((v & ((uint64_t)0xff << (6 * 8))) >> (5 * 8)) |
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((v & ((uint64_t)0xff << (5 * 8))) >> (3 * 8)) |
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((v & ((uint64_t)0xff << (4 * 8))) >> (1 * 8)) |
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((v & ((uint64_t)0xff << (3 * 8))) << (1 * 8)) |
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((v & ((uint64_t)0xff << (2 * 8))) << (3 * 8)) |
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((v & ((uint64_t)0xff << (1 * 8))) << (5 * 8)) |
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((v & ((uint64_t)0xff << (0 * 8))) << (7 * 8));
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}
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static inline uint32_t get_be32(const uint8_t *d)
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{
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return bswap32(get_u32(d));
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}
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static inline void put_be32(uint8_t *d, uint32_t v)
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{
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put_u32(d, bswap32(v));
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}
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#define UTF8_CHAR_LEN_MAX 4
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size_t __unicode_to_utf8(uint8_t *buf, unsigned int c);
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int __unicode_from_utf8(const uint8_t *p, size_t max_len, size_t *plen);
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int __utf8_get(const uint8_t *p, size_t *plen);
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/* Note: at most 21 bits are encoded. At most UTF8_CHAR_LEN_MAX bytes
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are output. */
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static inline size_t unicode_to_utf8(uint8_t *buf, unsigned int c)
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{
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if (c < 0x80) {
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buf[0] = c;
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return 1;
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} else {
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return __unicode_to_utf8(buf, c);
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}
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}
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/* return -1 in case of error. Surrogates are accepted. max_len must
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be >= 1. *plen is set in case of error and always >= 1. */
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static inline int unicode_from_utf8(const uint8_t *buf, size_t max_len, size_t *plen)
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{
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if (buf[0] < 0x80) {
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*plen = 1;
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return buf[0];
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} else {
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return __unicode_from_utf8(buf, max_len, plen);
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}
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}
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/* Warning: no error checking is done so the UTF-8 encoding must be
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validated before. */
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static force_inline int utf8_get(const uint8_t *buf, size_t *plen)
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{
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if (likely(buf[0] < 0x80)) {
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*plen = 1;
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return buf[0];
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} else {
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return __utf8_get(buf, plen);
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}
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}
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static inline int from_hex(int c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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else if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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else if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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else
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return -1;
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}
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static inline uint64_t float64_as_uint64(double d)
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{
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union {
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double d;
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uint64_t u64;
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} u;
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u.d = d;
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return u.u64;
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}
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static inline double uint64_as_float64(uint64_t u64)
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{
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union {
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double d;
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uint64_t u64;
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} u;
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u.u64 = u64;
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return u.d;
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}
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typedef union {
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uint32_t u32;
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float f;
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} f32_union;
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static inline uint32_t float_as_uint(float f)
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{
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f32_union u;
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u.f = f;
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return u.u32;
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}
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static inline float uint_as_float(uint32_t v)
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{
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f32_union u;
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u.u32 = v;
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return u.f;
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}
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#endif /* CUTILS_H */
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