lib/itoa.c


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#include "string.h"

int
ltostr(char *s, int size, unsigned long l, bool sign, int radix)
{
    unsigned wsize = 0;
    unsigned digits = 0;
    if((long)l < 0 && sign) {
        l = -((long)l);
        if(size > wsize && s != 0) s[wsize] = '-';
        wsize++;
    }

    for(unsigned long lv = l; lv != 0; lv /= radix) {
        digits++;
    }

    if(digits-- == 0) {
        if(size > wsize && s != 0) s[wsize] = '0';
        wsize++;
    }

    for(unsigned long lv = l; lv != 0; lv /= radix) {
        int digit = lv % radix;
        if(size > digits - wsize && s != 0) {
            s[digits - wsize] = (digit >= 10 ? (digit + 'a' - 10) : digit + '0');
        }
        wsize++;
    }
    if(size > wsize && s != 0) s[wsize] = 0;
    return ++wsize;
}