#include <mango/status.h>
#include <xpc/msg.h>
#include <xpc/string.h>

xpc_status_t xpc_string_read(
	const xpc_string_t *s,
	char *out,
	size_t max,
	size_t *nr_read)
{
	if ((s->s_flags & (XPC_STRING_F_IN | XPC_STRING_F_REMOTE))
	    != (XPC_STRING_F_IN | XPC_STRING_F_REMOTE)) {
		return KERN_BAD_STATE;
	}

	size_t to_read = max - 1;
	if (to_read > s->s_len) {
		to_read = s->s_len;
	}

	kern_status_t status
		= xpc_msg_read(s->s_origin, s->s_offset, out, to_read);
	if (status != KERN_OK) {
		return status;
	}

	out[to_read] = '\0';
	/* TODO */
	*nr_read = to_read;

	return KERN_OK;
}

xpc_status_t xpc_string_write(
	xpc_string_t *s,
	const char *in,
	size_t len,
	size_t *nr_written)
{
	if ((s->s_flags & (XPC_STRING_F_OUT | XPC_STRING_F_REMOTE))
	    != (XPC_STRING_F_IN | XPC_STRING_F_REMOTE)) {
		return KERN_BAD_STATE;
	}

	size_t to_write = len;
	if (to_write > s->s_max - 1) {
		to_write = s->s_max - 1;
	}

	kern_status_t status
		= xpc_msg_write(s->s_origin, s->s_offset, in, to_write);
	if (status != KERN_OK) {
		return status;
	}

	/* TODO */
	*nr_written = to_write;

	return KERN_OK;
}