/* See LICENSE file for copyright and license details. */
#include "common.h"


#if defined(__linux__)
# include <linux/kd.h>

int
have_micro_symbol(void)
{
	static int ret = -1;
	if (ret < 0) {
		struct unimapdesc desc;
		struct unipair *pairs = NULL;
		size_t i;
		ret = 1;
		desc.entry_ct = 0;
		desc.entries = NULL;
		if (ioctl(STDIN_FILENO, GIO_UNIMAP, &desc))
			if (!desc.entry_ct)
				goto out;
		desc.entries = pairs = ecalloc(desc.entry_ct, sizeof(*pairs));
		if (ioctl(STDIN_FILENO, GIO_UNIMAP, &desc))
			goto out;
		for (i = 0; i < desc.entry_ct; i++)
			if (desc.entries[i++].unicode == 0xB5U)
				goto out;
		ret = 0;
	out:
		free(pairs);
	}
	return ret;
}

#else

# if defined(__GNUC__)
__attribute__((__const__))
# endif
int
have_micro_symbol(void)
{
	return 1;
}

#endif