Ex_1.20_detab.c

/**
 * Exercise 1.20 -
 *
 * Write a Program detab, which replaces tabs in the input with a proper
 * number of blanks to spaces
 *
 **/


#include<stdio.h>

#define TABINC 8

int main(void)
{
	int nb,pos,c;

	nb = 0;
	pos = 1;

	while((c=getchar())!=EOF)
	{
		if( c == '\t')
		{
			nb = TABINC - (( pos - 1) % TABINC);

			while( nb > 0)
			{
				putchar('#');
				++pos;
				--nb;
			}
		}
		else if( c == '\n')
		{
			putchar(c);
			pos = 1;
		}
		else
		{
			putchar(c);
			++pos;
		}
	}

	return 0;
}