1 files changed, 46 insertions, 0 deletions
diff --git a/text.c b/text.c
new file mode 100644
index 0000000..abea26a
--- /dev/null
+++ b/text.c
@@ -0,0 +1,46 @@
+/* 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