--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/luajit/src/lj_char.h	Fri Jan 23 22:38:59 2026 -0800
@@ -0,0 +1,42 @@
+/*
+** Character types.
+** Donated to the public domain.
+*/
+
+#ifndef _LJ_CHAR_H
+#define _LJ_CHAR_H
+
+#include "lj_def.h"
+
+#define LJ_CHAR_CNTRL	0x01
+#define LJ_CHAR_SPACE	0x02
+#define LJ_CHAR_PUNCT	0x04
+#define LJ_CHAR_DIGIT	0x08
+#define LJ_CHAR_XDIGIT	0x10
+#define LJ_CHAR_UPPER	0x20
+#define LJ_CHAR_LOWER	0x40
+#define LJ_CHAR_IDENT	0x80
+#define LJ_CHAR_ALPHA	(LJ_CHAR_LOWER|LJ_CHAR_UPPER)
+#define LJ_CHAR_ALNUM	(LJ_CHAR_ALPHA|LJ_CHAR_DIGIT)
+#define LJ_CHAR_GRAPH	(LJ_CHAR_ALNUM|LJ_CHAR_PUNCT)
+
+/* Only pass -1 or 0..255 to these macros. Never pass a signed char! */
+#define lj_char_isa(c, t)	((lj_char_bits+1)[(c)] & t)
+#define lj_char_iscntrl(c)	lj_char_isa((c), LJ_CHAR_CNTRL)
+#define lj_char_isspace(c)	lj_char_isa((c), LJ_CHAR_SPACE)
+#define lj_char_ispunct(c)	lj_char_isa((c), LJ_CHAR_PUNCT)
+#define lj_char_isdigit(c)	lj_char_isa((c), LJ_CHAR_DIGIT)
+#define lj_char_isxdigit(c)	lj_char_isa((c), LJ_CHAR_XDIGIT)
+#define lj_char_isupper(c)	lj_char_isa((c), LJ_CHAR_UPPER)
+#define lj_char_islower(c)	lj_char_isa((c), LJ_CHAR_LOWER)
+#define lj_char_isident(c)	lj_char_isa((c), LJ_CHAR_IDENT)
+#define lj_char_isalpha(c)	lj_char_isa((c), LJ_CHAR_ALPHA)
+#define lj_char_isalnum(c)	lj_char_isa((c), LJ_CHAR_ALNUM)
+#define lj_char_isgraph(c)	lj_char_isa((c), LJ_CHAR_GRAPH)
+
+#define lj_char_toupper(c)	((c) - (lj_char_islower(c) >> 1))
+#define lj_char_tolower(c)	((c) + lj_char_isupper(c))
+
+LJ_DATA const uint8_t lj_char_bits[257];
+
+#endif