#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <errno.h>
#include "fileutil.h"

ssize_t getdelim(char **restrict lineptr, size_t *restrict n, int delim, FILE *restrict fp)
{
	ssize_t cur = 0;
	char *new_lineptr = NULL;
	size_t new_n;

	if(lineptr == NULL || n == NULL || fp == NULL)
	{
		errno=EINVAL;
		return -1;
	}

	if(*lineptr == NULL)
	{
		*n = 80;
		*lineptr = (char *) malloc(*n);
		if(*lineptr==NULL) return -1;
	}

	do
	{
		ssize_t read_size = __fp_fread2(fp, *lineptr + cur, *n - cur - 1, delim);
		if(read_size <= 0) return -1;
		cur += read_size;
		if((*lineptr)[cur - 1] != delim && !feof(fp))
		{
			new_n = *n * 2;
			new_lineptr = (char *) realloc(*lineptr, new_n);
			if(new_lineptr == NULL) return -1;
			*lineptr = new_lineptr;
			*n = new_n;
		}
	}while((*lineptr)[cur-1] != delim && !feof(fp));

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

	if(feof(fp) && (*lineptr)[cur-1] != delim)
	{
		return -1;
	}else{
		return cur;
	}
}