Support line- & column-based match locations

1 files changed, 36 insertions, 0 deletions

diff --git a/vendor/librune/lib/utf8/rtou8.c b/vendor/librune/lib/utf8/rtou8.c
new file mode 100644
index 0000000..1823f08
--- /dev/null
+++ b/vendor/librune/lib/utf8/rtou8.c
@@ -0,0 +1,36 @@
+#include "utf8.h"
+
+#include "internal/common.h"
+
+int
+rtou8(char8_t *s, rune ch, size_t n)
+{
+	if (ch <= _1B_MAX) {
+		if (n >= 1)
+			s[0] = ch;
+		return 1;
+	} else if (ch <= _2B_MAX) {
+		if (n >= 2) {
+			s[0] = (ch >> 6) | 0xC0;
+			s[1] = (ch & 0x3F) | 0x80;
+		}
+		return 2;
+	} else if (ch <= _3B_MAX) {
+		if (n >= 3) {
+			s[0] = (ch >> 12) | 0xE0;
+			s[1] = ((ch >> 6) & 0x3F) | 0x80;
+			s[2] = (ch & 0x3F) | 0x80;
+		}
+		return 3;
+	} else if (ch <= _4B_MAX) {
+		if (n >= 4) {
+			s[0] = (ch >> 18) | 0xF0;
+			s[1] = ((ch >> 12) & 0x3F) | 0x80;
+			s[2] = ((ch >> 6) & 0x3F) | 0x80;
+			s[3] = (ch & 0x3F) | 0x80;
+		}
+		return 4;
+	}
+
+	unreachable();
+}