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itoa.c
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itoa.c
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/*
* itoa.c
*
* Created on: 15.10.2018
* Author: Sven
*/
#include "itoa.h"
#include <string.h>
#ifdef __cplusplus
extern "C"{
#endif // __cplusplus
extern char* itoa(int value, char *string, int radix)
{
return ltoaEx(value, string, radix) ;
}
extern char* ltoaEx(long value, char *string, int radix)
{
char tmp[33];
char *tp = tmp;
long i;
unsigned long v;
int sign;
char *sp;
if ( string == NULL )
{
return 0 ;
}
if (radix > 36 || radix <= 1)
{
return 0 ;
}
sign = (radix == 10 && value < 0);
if (sign)
{
v = -value;
}
else
{
v = (unsigned long)value;
}
while (v || tp == tmp)
{
i = v % radix;
v = v / radix;
if (i < 10)
{
*tp++ = i+'0';
}
else
{
*tp++ = i + 'a' - 10;
}
}
sp = string;
if (sign)
{
*sp++ = '-';
}
while (tp > tmp)
{
*sp++ = *--tp;
}
*sp = 0;
return string;
}
extern char* utoa(unsigned long value, char *string, int radix)
{
return ultoa(value, string, radix);
}
extern char* ultoa(unsigned long value, char *string, int radix)
{
char tmp[33];
char *tp = tmp;
long i;
unsigned long v = value;
char *sp;
if ( string == NULL )
{
return 0;
}
if (radix > 36 || radix <= 1)
{
return 0;
}
while (v || tp == tmp)
{
i = v % radix;
v = v / radix;
if (i < 10)
{
*tp++ = i+'0';
}
else
{
*tp++ = i + 'a' - 10;
}
}
sp = string;
while (tp > tmp)
{
*sp++ = *--tp;
}
*sp = 0;
return string;
}
#ifdef __cplusplus
} // extern "C"
#endif // __cplusplus