From 4f2fb9ba5f529890b2a341e30a1c0c978a882e3a Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Mon, 23 Mar 2026 12:10:58 +0100
Subject: <iso646.h>, test for libc headers

---
 src/a_embedfilesdir.c  | 14 ++++++++++++++
 src/u_io.c             |  4 ----
 test/19-libc-headers.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 4 deletions(-)
 create mode 100644 test/19-libc-headers.c

diff --git a/src/a_embedfilesdir.c b/src/a_embedfilesdir.c
index 64189ef..d07bb87 100644
--- a/src/a_embedfilesdir.c
+++ b/src/a_embedfilesdir.c
@@ -85,6 +85,20 @@ typedef __builtin_va_list __gnuc_va_list;\n\
 #define LDBL_TRUE_MIN    4.94066e-324\n\
 ")},
 
+{"iso646.h", S("\
+#define and     &&\
+#define and_eq  &=\
+#define bitand  &\
+#define bitor   |\
+#define compl   ~\
+#define not     !\
+#define not_eq  !=\
+#define or      ||\
+#define or_eq   |=\
+#define xor     ^\
+#define xor_eq  ^=\
+")},
+
 {"stdnoreturn.h", S("\
 #define noreturn _Noreturn\n\
 ")},
diff --git a/src/u_io.c b/src/u_io.c
index f376c98..1dccb9d 100644
--- a/src/u_io.c
+++ b/src/u_io.c
@@ -857,10 +857,6 @@ openfile(const char **err, MemFile **pf, const char *path)
    size_t h, id, n = countof(fileht);
 
    if (*path == '@' && path[1] == ':') {
-      /* fast path to rule out filenames we know for sure aren't builtin */
-      /* !KEEP SYNC with embedfilesdir */
-      if (path[2] != 's' /* std*.h */
-       && path[2] != 'f' /* float.h */) return -1;
       uid.dev = -1;
       uid.str = path;
       h = hashs(0, path+2);
diff --git a/test/19-libc-headers.c b/test/19-libc-headers.c
new file mode 100644
index 0000000..2c8db38
--- /dev/null
+++ b/test/19-libc-headers.c
@@ -0,0 +1,48 @@
+/* EXPECT:
+*/
+
+/* C89 */
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <float.h>
+#include <limits.h>
+#include <locale.h>
+#include <math.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <wchar.h>
+#include <wctype.h>
+#include <iso646.h>
+
+/* C99 */
+#include <complex.h>
+#include <fenv.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <uchar.h>
+
+/* C11 */
+#include <stdalign.h>
+#ifndef __STDC_NO_ATOMICS__
+#include <stdatomic.h>
+#endif
+#include <threads.h>
+#include <stdnoreturn.h>
+#include <stdbit.h>
+
+/* C23 */
+// #include <stdbit.h>
+// #include <stdckdint.h>
+// #include <tgmath.h>
+
+int main(void) {
+   return 0;
+}
-- 
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