From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001
From: Vladimir Azarov <avm@intermediate-node.net>
Date: Tue, 1 Oct 2024 15:47:05 +0200
Subject: Initial version

---
 src/ctype/iswprint.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 src/ctype/iswprint.c

(limited to 'src/ctype/iswprint.c')

diff --git a/src/ctype/iswprint.c b/src/ctype/iswprint.c
new file mode 100644
index 0000000..86f9d64
--- /dev/null
+++ b/src/ctype/iswprint.c
@@ -0,0 +1,26 @@
+#include <wctype.h>
+
+/* Consider all legal codepoints as printable except for:
+ * - C0 and C1 control characters
+ * - U+2028 and U+2029 (line/para break)
+ * - U+FFF9 through U+FFFB (interlinear annotation controls)
+ * The following code is optimized heavily to make hot paths for the
+ * expected printable characters. */
+
+int iswprint(wint_t wc)
+{
+	if (wc < 0xffU)
+		return (wc+1 & 0x7f) >= 0x21;
+	if (wc < 0x2028U || wc-0x202aU < 0xd800-0x202a || wc-0xe000U < 0xfff9-0xe000)
+		return 1;
+	if (wc-0xfffcU > 0x10ffff-0xfffc || (wc&0xfffe)==0xfffe)
+		return 0;
+	return 1;
+}
+
+int __iswprint_l(wint_t c, locale_t l)
+{
+	return iswprint(c);
+}
+
+weak_alias(__iswprint_l, iswprint_l);
-- 
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