itoa.c

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#include "itoa.h"
 
#define ITOA_BUFFER_SIZE 64
char buffer[ITOA_BUFFER_SIZE];
 
#define _iota_routine(v)                                                       \
    do {                                                                       \
        while (v) {                                                            \
            buffer[--i] = '0' + (v % 10);                                      \
            v /= 10;                                                           \
        }                                                                      \
    } while (0)
 
STR ps_itoa(int v) {
    if (v == 0) return "0";
 
    int i = ITOA_BUFFER_SIZE - 1;
 
    // make positive and save sign
    int sign = v > 0 ? 1 : -1;
    long v2 = (long)v * sign;
 
    _iota_routine(v2);
 
    if (sign == -1) {
        buffer[--i] = '-';
    }
 
    buffer[ITOA_BUFFER_SIZE - 1] = 0;
    return buffer + i;
}
 
STR ps_ztoa(usize v) {
    if (v == 0) return "0";
 
    int i = ITOA_BUFFER_SIZE - 1;
 
    _iota_routine(v);
 
    buffer[ITOA_BUFFER_SIZE - 1] = 0;
    return buffer + i;
}