#include "drain.h"
#include <stdlib.h>
#include <string.h>

char *drain(FILE *fp)
{
	size_t size = 1025;
	char *buf = calloc(1025, 1);
	if (buf == NULL) {
		perror("drain");
		return NULL;
	}
	/* Read until end of file. */
	for (;;) {
		if (fread(buf + size - 1025, 1024, 1, fp) != 1)
			return buf;
		/* Line is longer than 1024 bytes, realloc to make space. */
		size += 1024;
		char *new_buf = realloc(buf, size);
		if (new_buf == NULL) {
			perror("drain");
			free(buf);
			return NULL;
		}
		buf = new_buf;
		memset(buf + size - 1024, 0, 1024);
	}
}