From: Kenneth Albanowski <kjahds@kjahds.com>
Date: Sat, 23 Jan 1999 21:52:15 +0000 (-0500)
Subject: Re: SvOPV() or SvPV_nolen() or ...
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=ce2f5d8f75586e7887cacd21ed88285c7953d9fc;p=p5sagit%2Fp5-mst-13.2.git

Re: SvOPV() or SvPV_nolen() or ...

	Message-ID: <Pine.LNX.3.93.990123212857.446B-100000@kjahds.kjahds.com>

p4raw-id: //depot/perl@2913
---

diff --git a/pod/perlguts.pod b/pod/perlguts.pod
index ce8c182..9c4831f 100644
--- a/pod/perlguts.pod
+++ b/pod/perlguts.pod
@@ -103,6 +103,15 @@ be accessed in thread-local storage in threaded Perl.  In any case, remember
 that Perl allows arbitrary strings of data that may both contain NULs and
 might not be terminated by a NUL.
 
+Also remember that C doesn't allow you to safely say C<foo(SvPV(s, len),
+len);>. It might work with your compiler, but it won't work for everyone.
+Break this sort of statement up into separate assignments:
+
+	STRLEN len;
+	char * ptr;
+	ptr = SvPV(len);
+	foo(ptr, len);
+
 If you want to know if the scalar value is TRUE, you can use:
 
     SvTRUE(SV*)