From 8fe3452cc6ac7af8c08c2044cd3757018a9c8887 Mon Sep 17 00:00:00 2001
From: Zefram <zefram@fysh.org>
Date: Fri, 22 Dec 2017 05:32:41 +0000
Subject: [PATCH] preserve numericness of system() args on Win32
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On Windows there's a nasty variation in the meaning of arguments
to Perl's system(), in which a numeric first argument isn't used as
part of the command to run, but instead selects between two different
operations to perform with the command (whether to wait for the command
to complete or not).  Therefore the reduction of argument scalars to
their operative values in the parent process, which was added in commit
64def2aeaeb63f92dadc6dfa33486c1d7b311963, needs to preserve numericness
of arguments on Windows.  Fixes [perl #132633].

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 pp_sys.c | 35 +++++++++++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/pp_sys.c b/pp_sys.c
index beb60da4c6..0649794104 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -4393,12 +4393,39 @@ PP(pp_system)
 # endif
 
     while (++MARK <= SP) {
-	SV *origsv = *MARK;
+	SV *origsv = *MARK, *copysv;
 	STRLEN len;
 	char *pv;
-	pv = SvPV(origsv, len);
-	*MARK = newSVpvn_flags(pv, len,
-		    (SvFLAGS(origsv) & SVf_UTF8) | SVs_TEMP);
+	SvGETMAGIC(origsv);
+#ifdef WIN32
+	/*
+	 * Because of a nasty platform-specific variation on the meaning
+	 * of arguments to this op, we must preserve numeric arguments
+	 * as numeric, not just retain the string value.
+	 */
+	if (SvNIOK(origsv) || SvNIOKp(origsv)) {
+	    copysv = newSV_type(SVt_PVNV);
+	    sv_2mortal(copysv);
+	    if (SvPOK(origsv) || SvPOKp(origsv)) {
+		pv = SvPV_nomg(origsv, len);
+		sv_setpvn(copysv, pv, len);
+		SvPOK_off(copysv);
+	    }
+	    if (SvIOK(origsv) || SvIOKp(origsv))
+		SvIV_set(copysv, SvIVX(origsv));
+	    if (SvNOK(origsv) || SvNOKp(origsv))
+		SvNV_set(copysv, SvNVX(origsv));
+	    SvFLAGS(copysv) |= SvFLAGS(origsv) &
+		(SVf_IOK|SVf_NOK|SVf_POK|SVp_IOK|SVp_NOK|SVp_POK|
+		    SVf_UTF8|SVf_IVisUV);
+	} else
+#endif
+	{
+	    pv = SvPV_nomg(origsv, len);
+	    copysv = newSVpvn_flags(pv, len,
+			(SvFLAGS(origsv) & SVf_UTF8) | SVs_TEMP);
+	}
+	*MARK = copysv;
     }
     MARK = ORIGMARK;
 
-- 
2.13.6