ficus/src/arch/x86/misc.cpp

//
// Created by Stepan Usatiuk on 13.08.2023.
//
extern "C" {
void _hcf() {
    //    *(volatile char *) (0) = 42;
    while (1)
        asm volatile("cli; hlt");
}

char *itoa(int value, char *str, int base) {
    char *rc;
    char *ptr;
    char *low;
    // Check for supported base.
    if (base < 2 || base > 36) {
        *str = '\0';
        return str;
    }
    rc = ptr = str;
    // Set '-' for negative decimals.
    if (value < 0 && base == 10) {
        *ptr++ = '-';
    }
    // Remember where the numbers start.
    low = ptr;
    // The actual conversion.
    do {
        // Modulo is negative for negative value. This trick makes abs() unnecessary.
        *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz"[35 + value % base];
        value /= base;
    } while (value);
    // Terminating the string.
    *ptr-- = '\0';
    // Invert the numbers.
    while (low < ptr) {
        char tmp = *low;
        *low++   = *ptr;
        *ptr--   = tmp;
    }
    return rc;
}
}