shifter.c
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#include <stdio.h>
#include <string.h>
#include "auxiliar.h"
#define LEFT 0
#define RIGHT 1
#define LOGIC 0
#define ARITH 1
#define ROTATE 2
int main(int argc, char **argv)
{
uint8_t direction, type;
int shift;
if(argc != 3)
{
error();
}
char *input = argv[1];
if(!strcmp(input,"error"))
{
error();
}
char **inputs = comma_separate(input);
if(inputs == NULL)
{
error();
}
int num_inputs = num_occurrences(input,',');
if(num_inputs != 2)
{
error();
}
int input_length = strlen(inputs[0]);
if(!strcmp("logic-left",argv[2]))
{
type = LOGIC;
direction = LEFT;
}
else if(!strcmp("logic-right",argv[2]))
{
type = LOGIC;
direction = RIGHT;
}
else if(!strcmp("arith-left",argv[2]))
{
type = ARITH;
direction = LEFT;
}
else if(!strcmp("arith-right",argv[2]))
{
type = ARITH;
direction = RIGHT;
}
else if(!strcmp("rotate-left",argv[2]))
{
type = ROTATE;
direction = LEFT;
}
else if(!strcmp("rotate-right",argv[2]))
{
type = ROTATE;
direction = RIGHT;
}
else
{
error();
}
shift = bin2udec(inputs[1]);
while(shift >= input_length)
{
shift = shift % input_length;
}
char *result;
if(!shift)
{
result = inputs[0];
}
else
{
if(type == LOGIC)
{
if(direction == LEFT)
{
result = dec2bin(bin2udec(inputs[0]) << shift,input_length);
}
else
{
result = dec2bin(bin2udec(inputs[0]) >> shift,input_length);
}
}
else if(type == ARITH)
{
if(direction == LEFT)
{
result = dec2bin(bin2dec(inputs[0]) << shift,input_length);
}
else
{
result = dec2bin(bin2dec(inputs[0]) >> shift,input_length);
}
}
else if(type == ROTATE)
{
if(direction == RIGHT)
{
shift = input_length - shift;
}
result = (char*) malloc(sizeof(char) * (input_length+1));
memset(result,0x00,input_length);
strncpy(result,inputs[0]+shift,input_length-shift);
strncpy(result + (input_length-shift),inputs[0],shift);
}
}
printf("%s",result);
free(result);
free_mem(inputs,num_inputs);
return 0;
}