Teach me to remove bloat!

Hey guys, I would like some pointer (no, not that kind) on removing bloat in code. Here is a fully functional piece of code that I wrote which I'm worried about bloat in. How do I shorten this?

int get_input()
{
    int count, paren_count, total_count, c;
    char *input, *temp;

    input = (char *) malloc (500 * sizeof (char));

    if (input == NULL) return 0;
    printf("%% ");
    for (count = paren_count = total_count = 0; (c = getchar()) != EOF; count++, input++, total_count++)
    {
        if (count == 499)
        {
            input -= total_count;
            temp = (char *) realloc (input, (500 + total_count) * sizeof (char));
            if (temp == NULL)
                return 0;
            input = temp;
            input += total_count;
        }
        if (c == '\n')
        {
            *input = '\0';
            temp = input;
            temp -= (count);
            count = 0;
            for (; *temp != '\0'; temp++)
            {
                if (*temp == '(')
                    paren_count++;
                else if (*temp == ')')
                    paren_count--;
            }
            if (paren_count == 0)
                break;
            printf("  ");
        }
        *input = c;
    }
    *temp = '\0';
    input -= total_count;
    printf("%s\n", input);
    free(input);
    return 0;
}

>>16
If we allow a header file we could even OMPTIMIZE even further:

h.h
#define GC getchar
#define C  char
#define M  malloc
#define SO sizeof
#define RA realloc
#define I  int
#define B  break
#define F  free
#define P  printf
#define R  return
#define Q  if
#define EF else if
#define FR for
#define G  I g(){I u,p,t,c;C *i,*m;i=(C*)M(500*SO(C));Q(i==0)R 0;P("%% ");FR(u=p=t=0;(c=GC())!=-1;u++,i++,t++){Q(u==499){i-=t;m=(C*)RA(i,(500+t)*SO(C));Q(m==0)R 0;i=m;i+=t;}Q(c=='\n'){*i='\0';m=i;m-=(u);u=0;FR(;*m!='\0';m++){Q(*m=='(')p++;EF(*m==')')p--;}Q(p==0)B;P("  ");}*i=c;}*m='\0';i-=t;P("%s\n",i);F(i);R 0;}

whatever.c
#include "h.h"

G