nonstdlib.cpp

Go to the documentation of this file.

 
#include <stdlib.h>
#include <ctype.h>
#include "nonstdlib.h"
 
// Amazingly itoa and utoa are not part of the C standard and thus not part
// of GCC. They were added in the AVR port, so they are included here.
 
void strreverse(char* begin, char* end)
{
    char aux;
    
    while(end>begin)
        aux=*end, *end--=*begin, *begin++=aux;
}
 
static char num[] = "0123456789abcdefghijklmnopqrstuvwxyz"; 
 
void itoa(int value, char* str, int base)
{   
    char* wstr = str;
    int sign;
    div_t res;
    
    // Validate base
    if (base<2 || base>35)
  {
    *wstr='\0';
    return;
  } 
    
    // Take care of sign    
    if ((sign=value) < 0)
    value = -value; 
    
    // Conversion. Number is reversed.  
    do
  { 
        res = div(value,base);  
        *wstr++ = num[res.rem]; 
    } while (value=res.quot);
 
    if (sign<0)
    *wstr++='-';
    
    *wstr='\0';
    
    // Reverse string   
    strreverse(str, wstr-1);
}
 
void utoa(unsigned int value, char* str, int base)
{
    char* wstr = str;
    div_t res;
    
    // Validate base
    if (base<2 || base>35)
  {
    *wstr='\0';
    return;
  } 
    
    // Conversion. Number is reversed.  
    do
  { 
        res = div(value,base);  
        *wstr++ = num[res.rem]; 
    } while (value=res.quot);
 
    *wstr='\0';
    
    // Reverse string   
    strreverse(str, wstr-1);
}
 
void ltoa(long value, char* str, int base)
{
    char* wstr = str;
    long sign;
    div_t res;
    
    // Validate base
    if (base<2 || base>35)
  {
    *wstr='\0';
    return;
  } 
    
    // Take care of sign    
    if ((sign=value) < 0)
    value = -value; 
    
    // Conversion. Number is reversed.  
    do
  { 
        res = div(value,base);  
        *wstr++ = num[res.rem]; 
    } while (value=res.quot);
 
    if (sign<0)
    *wstr++='-';
    
    *wstr='\0';
    
    // Reverse string   
    strreverse(str, wstr-1);
}
 
void ultoa(unsigned long value, char * str, int base)
{
    char* wstr = str;
    div_t res;
    
    // Validate base
    if (base<2 || base>35)
  {
    *wstr='\0';
    return;
  } 
 
    // Conversion. Number is reversed.  
    do
  { 
        res = div(value,base);  
        *wstr++ = num[res.rem]; 
    } while (value=res.quot);
 
    *wstr='\0';
    
    // Reverse string   
    strreverse(str, wstr-1);
}