#include <ivy/file.h>
#include <stdlib.h>
#include <string.h>

static enum ivy_status file_readline(
	struct ivy_line_source *src, char *buf, size_t count, size_t *nr_read,
	const char *prompt)
{
	if (!count) {
		*nr_read = 0;
		return IVY_OK;
	}

	struct ivy_file *f = (struct ivy_file *)src;
	if (!fgets(buf, (int)count, f->f_fp)) {
		return feof(f->f_fp) ? IVY_ERR_EOF : IVY_ERR_IO_FAILURE;
	}

	*nr_read = strlen(buf);
	return IVY_OK;
}

struct ivy_file *ivy_file_from_fp(FILE *fp)
{
	struct ivy_file *file = malloc(sizeof *file);
	if (!file) {
		return NULL;
	}

	memset(file, 0x0, sizeof *file);

	file->f_fp = fp;
	file->f_base.s_readline = file_readline;

	return file;
}

void ivy_file_close(struct ivy_file *file)
{
	fclose(file->f_fp);
	free(file);
}