From 64466d840e2933b2b353f7a3ce9f66f00de88de5 Mon Sep 17 00:00:00 2001
From: Giacomo Tesio <giacomo@tesio.it>
Date: Wed, 8 Feb 2017 00:19:22 +0100
Subject: [PATCH] libc.h: simplify ARGBEGIN macro

Should fix CID 155592 since the idiom:

	argv0 = nil;
	ARGBEGIN{
		...
	}ARGEND

would not produce logically dead code.
---
 sys/include/libc.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/include/libc.h b/sys/include/libc.h
index bde529d..e40e300 100644
--- a/sys/include/libc.h
+++ b/sys/include/libc.h
@@ -710,7 +710,10 @@ extern int		dirmodefmt(Fmt*);
 
 extern char *argv0;
 /* #define	ARGBEGIN	for((argv0||(argv0=*argv)),argv++,argc--;\ */
-#define ARGBEGIN        for((argv0?0:(argv0=*argv)),argv++,argc--;\
+#define ARGBEGIN        if(argv0==nil){\
+				argv0=*argv;\
+			}\
+			for(argv++,argc--;\
 			    argv[0] && argv[0][0]=='-' && argv[0][1];\
 			    argc--, argv++) {\
 				char *_args, *_argt;\