From: Mark Adler <madler@alumni.caltech.edu>
Date: Sun, 3 Jun 2012 19:45:55 +0000 (-0700)
Subject: Use _snprintf for snprinf in Microsoft C.
X-Git-Tag: v1.2.7.1~50
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25e4a3da552ab570d2a049cc2d75b6e23ba9362a;p=thirdparty%2Fzlib-ng.git

Use _snprintf for snprinf in Microsoft C.

More than a decade later, Microsoft C does not support the C99
standard.  It's good that _snprintf has a different name, since it
does not guarantee that the result is null terminated, as does
snprintf.  However where _snprintf is used under Microsoft C, the
destination string is assured to be long enough, so this will not
be a problem.  This occurs in two places, both in gzlib.c.  Where
sprintf functionality is needed by gzprintf, vsnprintf is used in
the case of Microsoft C.
---

diff --git a/gzguts.h b/gzguts.h
index ee3f281aa..68d135b47 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -88,6 +88,14 @@
 #  endif
 #endif
 
+/* unlike snprintf (which is required in C99, yet still not supported by
+   Microsoft more than a decade later!), _snprintf does not guarantee null
+   termination of the result -- however this is only used in gzlib.c where
+   the result is assured to fit in the space provided */
+#ifdef _MSC_VER
+#  define snprintf _snprintf
+#endif
+
 #ifndef local
 #  define local static
 #endif