single_ennead/utils.cpp at main · justecorruptio/single_ennead · GitHub

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#include "utils.h"

char itoa_buf[8] = "\0\0\0\0\0\0\0\0";
char * itoa(uint16_t x, int base) {
    uint8_t i = 6;
    do {
        char c = (x % base) + '0';
        if (c > '9'){
            c = c - '9' + 'A' - 1;
        }
        itoa_buf[i--] = c;
        x /= base;
    } while(x);

    // Must immediately use this.
    return itoa_buf + i + 1;
}

uint8_t strlen(const uint8_t* s) {
    uint8_t* t = s;
    while(*t) t++;
    return t - s;
}

uint8_t popcount(uint8_t n) {
    n = ((n & 0xaa) >> 1) + ((n & 0x55) >> 0);
    n = ((n & 0xcc) >> 2) + ((n & 0x33) >> 0);
    n = ((n & 0xf0) >> 4) + ((n & 0x0f) >> 0);
    return n;
};

char loadPStrBuf [128];
char * loadPStr(char * pAddr) {
    int i;
    char * ptr = loadPStrBuf;
    for(i = 0; i < 127; i++) {
        char c = pgm_read_byte(pAddr + i);
        if(!c) break;
        ptr[i] = c;
    }
    ptr[i] = 0;
    return loadPStrBuf;
}