Replacing strings of blanks by tabs and blanks to achieve same spacing

#include 

#define MAXLINE 1000    /* Maximum length of a line */
#define TABSTOP 4       /* Length of tabstop */

int getLine(char line[], int limit);
int lookAhead(char line[], int start, int end);

    /*
     * Exercise 1-21
     * Write a program entab that replaces strings of blanks
     * by the minimum number of tabs and blanks to achieve the
     * same spacing.
     */

int main(void)
{
    int tabIndex, i;
    char line[MAXLINE];

    while ((getLine(line, MAXLINE)) > 0) {
        i = 0;
        while (line[i] != '\0') {
            if (line[i] == ' ') {
                tabIndex = i + (TABSTOP - (i % TABSTOP)); 
                if ((lookAhead(line, i + 1, tabIndex)) == 1) {
                    putchar('\t');
                    i = tabIndex;
                } else {
                    putchar(line[i]);
                    ++i; 
                }
            } else {
                putchar(line[i]);
                ++i;
            }
        }
    }
    return 0;
}

int getLine(char line[], int limit)
{
    int inputVal, i;

    for (i=0; i < (limit - 1) && (inputVal = getchar()) != EOF &&
            inputVal != '\n'; ++i) {
        line[i] = inputVal;
    }
    if (inputVal == '\n') {
        line[i] = inputVal;
        ++i;
    }
    line[i] = '\0';
    return i;
}

int lookAhead(char line[], int start, int end)
{
    int i, clearPath;

    clearPath = 1;
    for (i = start; i < end; ++i) {
        if (line[i] != ' '){
            clearPath = 0;
        }
    }
    return clearPath;
}