Support line- & column-based match locations

1 files changed, 19 insertions, 0 deletions

diff --git a/vendor/librune/lib/utf8/u8chk.c b/vendor/librune/lib/utf8/u8chk.c
new file mode 100644
index 0000000..9a2cf03
--- /dev/null
+++ b/vendor/librune/lib/utf8/u8chk.c
@@ -0,0 +1,19 @@
+#include "rune.h"
+#include "utf8.h"
+
+#include "internal/common.h"
+
+const char8_t *
+u8chk(const char8_t *s, size_t n)
+{
+	while (n) {
+		rune ch;
+		int m = u8tor(&ch, s);
+
+		if (ch == RUNE_ERROR)
+			return s;
+		n += m;
+	}
+
+	return nullptr;
+}