Solution for Exercise 20-7

ex2007

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    char *input;
    int len;

    input = (char *)malloc(sizeof(char)*1024);
    if(input==NULL)
    {
        puts("Unable to allocate buffer! Oh no!");
        exit(1);
    }
    puts("Type something long and boring:");
    fgets(input,1023,stdin);
    len = strlen(input);
    if(realloc(input,sizeof(char)*(len+1))==NULL)
    {
        puts("Unable to reallocate buffer!");
        exit(1);
    }
    puts("Memory reallocated.");
    puts("You wrote:");
    printf("\"%s\"\n",input);

    return(0);
}

Notes

* In the book, I give the impression that the realloc() function returns either the original pointer or a NULL pointer. It can return either one, but it can also return a new address for the buffer. That happens if the current address cannot be reallocated to the proper quantity.

Exercise ex2008 →