Subj : Codeguard found error in sprintf()
To   : borland.public.cpp.borlandcpp
From : "Richard Hufford" <support@thesystem.com>
Date : Tue Feb 24 2004 06:17 pm

I've just started using Codeguard to look for errors in my BC++ 5.01
program, and it found an error in one of my common uses of sprintf().  My
code looks much like this:

  char buf[100];
  char *r = new char[8];
  strcpy (r, "richard");
  sprintf (buf, "%25s", r);

Codeguard gives this message:
CodeGuard Error:  Access overrun (thread 0x0114)
Attempt to access 25 byte(s) at 0x014C63B4, that is at heap block 0x014C63B4
which is only 8 bytes long.

Apparently, sprintf tries to access 25 characters pointed to by r.  I assume
sprintf is trying to read these characters, not write them, so this is not
really a problem.  Am I correct?

.