spaces to tabs

#include <stdio.h>
#define MAXTSPACE 8
int main()
{
        int c, temp, spacecnt, charcnt;
        spacecnt = charcnt = MAXTSPACE;
        temp = 0;

        while((c = getchar()) != EOF ) {
                        if(c == '\n') {
                                putchar(c);
                                spacecnt = MAXTSPACE;
                        } else if(c == ' ') {
                                --spacecnt;
                                --charcnt;
                                if(spacecnt < 1 && charcnt < 1) {
                                        printf("\t");
                                        spacecnt = charcnt = MAXTSPACE;
                                }
                        } else {
                                --charcnt;
                                if(charcnt < 1) {
                                        charcnt = MAXTSPACE;
                                }
                                putchar(c);
                        }
        }

        return 0;
}