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From: Jens Staal <staal1978@gmail.com>
To: 9front@9front.org
Subject: [patch] add isblank to ape/ctype.h
Date: Fri, 24 Jul 2020 06:37:50 +0200
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For some reason isblank was not included in ctype.h despite _ISblank being 
defined.

The isblank function is part of standard ctype.h

https://pubs.opengroup.org/onlinepubs/009695399/basedefs/ctype.h.html

I noticed this when  I made a shim wctype.h in my "libwtf" attempt to provide 
wchar dependencies.
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# HG changeset patch
# User Jens Staal <staal1978@gmail.com>
# Date 1595564874 -7200
#      Fri Jul 24 06:27:54 2020 +0200
# Node ID e8dfabb75c221d6e354e6a349b154180d172cf56
# Parent  639ad985a75b382b9053812c6943900ef8dd1e91
add isblank to ape/ctype.h

diff -r 639ad985a75b -r e8dfabb75c22 sys/include/ape/ctype.h
--- a/sys/include/ape/ctype.h	Mon Jul 20 18:58:52 2020 -0700
+++ b/sys/include/ape/ctype.h	Fri Jul 24 06:27:54 2020 +0200
@@ -8,6 +8,7 @@
 
 extern int isalnum(int);
 extern int isalpha(int);
+extern int isblank(int);
 extern int iscntrl(int);
 extern int isdigit(int);
 extern int isgraph(int);
@@ -38,6 +39,7 @@
 extern unsigned char _ctype[];
 #define	isalnum(c)	(_ctype[(unsigned char)(c)]&(_ISupper|_ISlower|_ISdigit))
 #define	isalpha(c)	(_ctype[(unsigned char)(c)]&(_ISupper|_ISlower))
+#define	isblank(c)	(_ctype[(unsigned char)(c)]&_ISblank)
 #define	iscntrl(c)	(_ctype[(unsigned char)(c)]&_IScntrl)
 #define	isdigit(c)	(_ctype[(unsigned char)(c)]&_ISdigit)
 #define	isgraph(c)	(_ctype[(unsigned char)(c)]&(_ISpunct|_ISupper|_ISlower|_ISdigit))

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