Question

1. What does the function modify_it() do?

2. What are any issues or problems that you see with it?

3. How could you improve the function, and what benefits would your improvements bring?

4. What other additional improvements could you make to the rest of the code?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/time.h>

typedef int int32;
typedef char int8;

void change_it(int8 *output, int8 *input_1, const int8 *input_2, int32 length)
{
int32 i = 0;

for(i=0; i<length; i++)
{
output[i] = (int8)(input_1[i] ^ input_2[i]);
}

return;
}

void itoa( int32 num, int8 *alpha, int32 radix )
{
if( radix == 10 )
{
sprintf(alpha, "%i", num);
}
else if( radix == 16 )
{
sprintf(alpha, "%X", num);
}
}

int8 *modify_it(int32 modifier, const int8 *input_1, int32 length)
{
int8 leading[3];
int32 i_leading;
int8 * temp_string = NULL;
int8 * ret;
int32 i = 0;

itoa(modifier/2, leading, 10);
i_leading = atoi(leading);
temp_string = (int8 *) malloc(8);
ret = (int8 *) malloc(length);
memset(temp_string, 0, 8);
temp_string[0] = 0;

if( (modifier+1)%2 == 0 ) {
temp_string[0] = (int8)((i_leading<<4) + 8);
}
else {
temp_string[0] = (int8)(i_leading<<4);
}

for(i=0; i<(length>>3); i++)
{
change_it(ret+i*8, temp_string, input_1+i*8, 8);
}

Answer 1

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