File content as of revision 31:79940947df2c:

#include <string.h>
#include "itoa.h"
using namespace std;

// Implementation of itoa()
char* itoa(int num, char* str, int base)
{
    int i = 0;
    bool isNegative = false;
 
    /* Handle 0 explicitely, otherwise empty string is printed for 0 */
    if (num == 0)
    {
        str[i++] = '0';
        str[i] = '\0';
        return str;
    }
 
    // In standard itoa(), negative numbers are handled only with 
    // base 10. Otherwise numbers are considered unsigned.
    if (num < 0 && base == 10)
    {
        isNegative = true;
        num = -num;
    }
 
    // Process individual digits
    while (num != 0)
    {
        int rem = num % base;
        str[i++] = (rem > 9)? (rem-10) + 'a' : rem + '0';
        num = num/base;
    }
 
    // If number is negative, append '-'
    if (isNegative)
        str[i++] = '-';
 
    str[i] = '\0'; // Append string terminator
 
    // Reverse the string
    reverse(str);
 
    return str;
}

/*
** reverse string in place 
*/
void reverse(char *s){
char *j;
int c;
 
  j = s + strlen(s) - 1;
  while(s < j) {
    c = *s;
    *s++ = *j;
    *j-- = c;
  }
}