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A patch for libio
- To: drepper@cygnus.com (Ulrich Drepper)
- Subject: A patch for libio
- From: hjl@lucon.org (H.J. Lu)
- Date: Sun, 23 Aug 1998 09:40:33 -0700 (PDT)
- Cc: libc-hacker@cygnus.com (GNU C Library)
Hi, Ulrich,
This is a patch for glibc 2.0.7. Could you please check glibc 2.1 has
the same bug?
BTW, what happened to my libstdc++ patch?
Thanks.
--
H.J. Lu (hjl@gnu.org)
----
Sun Aug 23 09:36:54 1998 H.J. Lu (hjl@gnu.org)
* libio/vsnprintf.c (_IO_vsnprintf): Clear "string" if "maxlen"
is 1.
Index: libio/vsnprintf.c
===================================================================
RCS file: /home/work/cvs/gnu/glibc-2.0/libio/vsnprintf.c,v
retrieving revision 1.1.1.1
diff -u -p -r1.1.1.1 vsnprintf.c
--- vsnprintf.c 1997/09/19 18:10:38 1.1.1.1
+++ vsnprintf.c 1998/08/23 16:35:11
@@ -45,6 +45,10 @@ _IO_vsnprintf (string, maxlen, format, a
_IO_init ((_IO_FILE *) &sf, 0);
_IO_JUMPS ((_IO_FILE *) &sf) = &_IO_str_jumps;
+ if (maxlen == 1)
+ /* This is a very special case since _IO_str_init_static () will
+ use strlen (string) for the size of string if maxlen - 1 == 0. */
+ string [0] = '\0';
_IO_str_init_static ((_IO_FILE *) &sf, string, maxlen - 1, string);
ret = _IO_vfprintf ((_IO_FILE *) &sf, format, args);
*((_IO_FILE *) &sf)->_IO_write_ptr = '\0';