Simple POSIX getline() implementation in C using fgets()

getline.c

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

ssize_t getline(char **restrict lineptr, size_t *restrict n, FILE *restrict stream)
{
    // check if either lineptr or n are NULL pointers
    if (lineptr == NULL || n == NULL)
    {
        fputs("Error! Bad arguments.\n", stderr);
        return -1;
    }

    // check if stream is valid pointer
    if (stream == NULL)
    {
        fputs("Error! Bad stream pointer.\n", stderr);
        return -1;
    }

    // use chunk array of 128 bytes as parameters for fgets()
    char chunk[128];

    // allocate block of memory for *lineptr if it is NULL
    if (*lineptr == NULL)
    {
        *n = sizeof(chunk);
        *lineptr = malloc(*n);
        if (*lineptr == NULL)
        {
            fputs("Error! Unable to allocate memory for lineptr buffer.\n", stderr);
            return -1;
        }
    }

    (*lineptr)[0] = '\0';

    while (fgets(chunk, sizeof(chunk), stream))
    {
        // resize the *lineptr buffer if necessary
        if (*n - strlen(*lineptr) < sizeof(chunk))
        {
            *n *= 2;
            *lineptr = realloc(*lineptr, *n);
            if (*lineptr == NULL)
            {
                fputs("Error! Unable to reallocate memory for lineptr buffer.\n", stderr);
                free(lineptr);
                return -1;
            }
        }

        // append the chunk to the end of the *lineptr buffer
        strcat(*lineptr, chunk);

        // check if *lineptr contains '\n', if yes then return the *lineptr length
        if ((*lineptr)[strlen(*lineptr) - 1] == '\n')
        {
            return strlen(*lineptr);
        }
    }

    // return error
    return -1;
}

int main(void)
{
    FILE *fp;
    char *line;
    size_t len;

    fp = fopen("./sample.txt", "r");
    line = NULL;
    len = 0;

    if (fp == NULL)
    {
        printf("Error! Unable to open the provided file.\n");
        exit(EXIT_FAILURE);
    }

    while (getline(&line, &len, fp) != -1)
    {
        printf("Line: '%s'\n", line);
    }

    fclose(fp);

    return 1;
}

sample.txt

Foo Bar Bazz
Bar Bazz Foo
Bazz Foo Bar
Foo Bar Bazz