```c
#include <stdio.h>

#include "io.h"

int8_t
io_open(t_io *io, const char *input_path, const char *output_path)
{
	io->in = (NULL != input_path) ? fopen(input_path, "r") : stdin;
	if (NULL == io->in)
	{
		perror(input_path);
		return (1);
	}
	io->out = (NULL != output_path) ? fopen(output_path, "w") : stdout;
	if (NULL == io->out)
	{
		perror(output_path);
		if (io->in != stdin)
			fclose(io->in);
		return (1);
	}
	return (0);
}

void
io_close(t_io *io)
{
	if (NULL != io->in && io->in != stdin)
		fclose(io->in);
	if (NULL != io->out && io->out != stdout)
		fclose(io->out);
}
```