/* Exercise 1-20. Write a program detab that replaces tabs in the input with the proper number of blanks to space to the next tab stop. Assume a fixed set of tab stops, say every n columns. Should n be a variable or a symbolic parameter?

*

* */

#include <stdio.h>

#define MAX_LINE 1000

#define TAB_STOP 4

//#define SPACE ' '

#define TAB '\t'

#define SPACE '_'

int getln(char s[], int limit)

{

int chr, i;

for ( i=0; i < limit-1 && (chr=getchar()) != EOF; ++i)

{

s[i] = chr;

if ( chr == '\n' )

break;

}

s[i] = '\0';

return i;

}

void detab(char original[], char detabbed[], int length)

{

int currentCol;

currentCol = 0 ;

//spaceOffset = 0;

int workingLength;

workingLength = 0;

int i;

/* int spacesAdded;

spacesAdded = 0;

*/

for ( currentCol = 0; currentCol <= length; ++currentCol )

{

if (original[currentCol] == TAB ) {

for (i=0; i <= TAB_STOP; ++i) {

detabbed[workingLength + i] = SPACE;

}

workingLength += TAB_STOP;

} else {

detabbed[workingLength] = original[currentCol];

++workingLength;

}

}

}

int main (){

char line[MAX_LINE];

char cleanLine[MAX_LINE];

int len;

while ( (len = getln(line, MAX_LINE)) > 0 )

{

printf("\nLine::: %s",line);

detab(line, cleanLine, len);

printf("\nDETAB:: %s",cleanLine);

}

return 0;

}