Samuel Thibault
2007-Dec-28 12:08 UTC
[Xen-devel] [PATCH][Mini-OS] printf("%n" behavior on overflow
Hello,
In C99 (7.19.6.2.10), the behavior of scanf("stuff... %n", ...,
&n) is
said to be undefined if the value to be put is n can''t fit. I guess we
can safely consider that the same applies to printf.
Signed-off-by: Samuel Thibault <samuel.thibault@citrix.com>
diff -r 5da126f8960e -r 077f5106d691 extras/mini-os/lib/printf.c
--- a/extras/mini-os/lib/printf.c Fri Dec 28 11:52:16 2007 +0000
+++ b/extras/mini-os/lib/printf.c Fri Dec 28 12:01:05 2007 +0000
@@ -426,8 +426,6 @@ int vsnprintf(char *buf, size_t size, co
case ''n'':
- /* FIXME:
- * What does C99 say about the overflow case here? */
if (qualifier == ''l'') {
long * ip = va_arg(args, long *);
*ip = (str - buf);
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