Ввод строк неопределенного размера.

gistfile1.c

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

#define BUFF_SIZE 6 /* 5 chars and \0 */

int main()
{
    int count = 0;
    char temp[BUFF_SIZE];
    char * result = NULL;

    printf("Please, enter a long string.\n> ");

    do {
        fgets(temp, BUFF_SIZE, stdin);

        count++;

        result = (char *) realloc(result, count * sizeof(char) * BUFF_SIZE);

        if (result != NULL)
            strcat(result, temp);
        else
            return 1;

    } while(strlen(temp) == BUFF_SIZE-1 && temp[4] != '\n');

    printf("String is: %s", result);

    return 0;
}

gistfile2.c

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

int main()
{
    int count = 0;
    char c;
    char * result = '\0';

    printf("Please, enter a long string.\n> ");

    while ((c = getchar()) != '\n')
    {
        count++;
        result = (char *) realloc(result, count * sizeof(char));

        if (result != NULL)
            result[count - 1] = c;
        else
            return 1;
    }

    printf("String is: %s\n", result);

    return 0;
}