grep a word function

#include <stdio.h>
#include <string.h>
#define MAX     200
int
read_line(char *line) {
        int c;
        unsigned char i = 0;
        while ((c = getchar()) != EOF && i < MAX - 1) {
                line[i++] = c;
                if (c == '\n')
                        break;
        }
        line[i] = '\0';
        return (i);
}
int
main()
{
        char line[MAX], word[] = "illumos";
        while (read_line(line))
                if (strstr(line, word) != 0)
                        puts(line);
        return (0);
}