util.c

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


char* getline_unlim(void){
    enum {FGETS_BUFSIZE = 50};
    int i, counter = 1, flag = 0;
    char *tmp, *c = (char*) calloc((FGETS_BUFSIZE-1)*counter + 1, sizeof(char*));
    if (fgets(c, 2, stdin) != NULL && !(feof(stdin))){
        if (feof(stdin)){
            return NULL;
        }
        if ( *c == '\n' ) { *c = '\0'; return c;}
        tmp = fgets(c + 1, FGETS_BUFSIZE, stdin);
        if (tmp == NULL && !feof(stdin)){
            fprintf(stderr, "\n%s\n", strerror(errno));
            exit(EXIT_FAILURE);
        }
        for(i = 0; i < (FGETS_BUFSIZE - 1) + 1; i++){
                if (c[i] == '\n' || c[i] == '\0'){
                    c[i] = '\0';
                    flag = 1;
                }
            }
        for(; flag == 0; counter++){
            c = realloc(c, counter*(FGETS_BUFSIZE - 1) + 1 + FGETS_BUFSIZE);
            tmp = fgets(c + counter*(FGETS_BUFSIZE - 1) + 1, FGETS_BUFSIZE, stdin);
            if (tmp == NULL && !feof(stdin)){
                fprintf(stderr, "\n%s\n", strerror(errno));
                exit(EXIT_FAILURE);
            }
            for(i = counter*(FGETS_BUFSIZE - 1); i < (counter + 1)*(FGETS_BUFSIZE - 1) + 1; i++){
                if (c[i] == '\n' || c[i] == '\0'){
                    c[i] = '\0';
                    flag = 1;
                }
            }
        }
    }
    else{
            c = NULL;
    }
    return c;
}