Chapter 1 - A Tutorial Introduction 17

Answer to Exercise 1-17, page 31
Solution by "MJSR"
Write a program to print all input lines that are longer than 80 characters.

 

#include <stdio.h>

#define MINLENGTH 81

int readbuff(char *buffer) {
    size_t i=0;
    int c;
    while (i < MINLENGTH) {
        c = getchar();
        if (c == EOF) return -1;
        if (c == '\n') return 0;
        buffer[i++] = c;
    }
    return 1;
}

int copyline(char *buffer) {
    size_t i;
    int c;
    int status = 1;
    for(i=0; i<MINLENGTH; i++)
        putchar(buffer[i]);
    while(status == 1) {
        c = getchar();
        if (c == EOF)
            status = -1;
        else if (c == '\n')
            status = 0;
        else
            putchar(c);
    }
    putchar('\n');
    return status;
}

int main(void) {
    char buffer[MINLENGTH];
    int status = 0;
    while (status != -1) {
        status = readbuff(buffer);
        if (status == 1)
            status = copyline(buffer);
    }
    return 0;
}