grey.h

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#ifndef GREY_H
#define GREY_H
 
#ifdef __cplusplus
extern "C"
{
#endif
 
#define GREY_VERSION "1.0.0"
 
#include <stdint.h>
#include <inttypes.h>
 
#ifndef GREY_UINTBITS
#define GREY_UINTBITS 64
#endif
 
#if (GREY_UINTBITS == 64)
typedef uint64_t grey_code_t;
#define GREY_MAX ((uint64_t) UINT64_MAX)
#define GREY_FMT PRIu64
#define GREY_FMTx PRIx64
#define GREY_FMTX PRIX64
#elif (GREY_UINTBITS == 32)
typedef uint32_t grey_code_t;
#define GREY_MAX ((uint32_t) UINT32_MAX)
#define GREY_FMT PRIu32
#define GREY_FMTx PRIx32
#define GREY_FMTX PRIX32
#elif (GREY_UINTBITS == 16)
typedef uint16_t grey_code_t;
#define GREY_MAX ((uint16_t) UINT16_MAX)
#define GREY_FMT PRIu16
#define GREY_FMTx PRIx16
#define GREY_FMTX PRIX16
#elif (GREY_UINTBITS == 8)
typedef uint8_t grey_code_t;
#define GREY_MAX ((uint8_t) UINT8_MAX)
#define GREY_FMT PRIu8
#define GREY_FMTx PRIx8
#define GREY_FMTX PRIX8
#else
#error "Please set GREY_UINTBITS to a value in {8, 16, 32, 64}."
#endif
 
typedef grey_code_t grey_int_t;
 
#define grey_add(grey, delta) grey_to(grey_from((grey)) + (delta))
 
#define grey_incr(grey) grey_add((grey), 1)
 
#define grey_decr(grey) grey_add((grey), -1)
 
grey_code_t grey_to(grey_int_t value);
 
grey_int_t grey_from(grey_code_t grey);
 
 
uint8_t grey_binstr(char str[GREY_UINTBITS+1], grey_code_t grey);
 
#ifdef __cplusplus
}
#endif
 
#endif  /* GREY_H */