Date: Tue, 20 Jan 1998 19:33:18 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: current@freebsd.org Subject: Nasty GCC bug? Message-ID: <199801201933.MAA27126@usr04.primenet.com>
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I have discovered what I think is a nasty bug, having to do with
passing signed smaller-than-int values to varradic functions.
#include <stdio.h>
/*
* demonstrate bug with signed smaller-than-int arguments to
* varradic functions...
*/
main()
{
short ss = 0xebeb;
unsigned short us = 0xebeb;
char sc = 0xeb;
unsigned char uc = 0xeb;
printf( "Expecting 0x%04x, but getting 0x%04x\n", us, ss);
printf( "Expecting 0x%02x, but getting 0x%02x\n", uc, sc);
}
What is happening is that the value is being sign-extended to int
when it is pushed on the stack.
I don't know how you would make "%d" and "%x" work at the same time,
without a type descriptor on the stack before the argument.
Maybe there needs to be a character type specifier for "%x"?
Terry Lambert
terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.
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