kest_hfunc.h

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#ifndef KEST_INT_HELPER_FUNCTIONS_H_
#define KEST_INT_HELPER_FUNCTIONS_H_
 
/* Helper functions! Yay! */
 
#define binary_max(x, y) ((x > y) ? x : y)
#define binary_min(x, y) ((x > y) ? y : x)
 
#define sqr(x) (x * x)
 
// For some reason, printf on esp32 does not support %b
char *binary_print_n (uint32_t x, int n);
 
char *binary_print_8 (uint8_t  x);
char *binary_print_16(uint16_t x);
char *binary_print_24(uint32_t x);
char *binary_print_32(uint32_t x);
 
// IBM = "initial bit mask"; 0b000..0111...1 with "x" 1s
#define IBM(x) ((1u << (x)) - 1)
// Extracts n bits, starting at x, and shifted to the start 
#define range_bits(x, n, start) (((x) >> (start)) & IBM(n))
// Gives a word with bits y to x being the initial bits of "val"
#define place_bits(x, y, val) ((IBM((x)-(y)+1) & ((uint32_t)val)) << y)
 
inline static uint32_t hash(const char *str)
{
    if (!str) return 0;
    
    uint32_t x = 5381;
    int c;
 
    while ((c = *str++))
        x = ((x << 5) + x) + c;
 
    return x;
}
 
int format_float(char *buf, float val, int max_len);
 
#endif