From: =?utf-8?q?Pawe=C5=82_Sikora?= <pluto@pld-linux.org>
To: linux-kernel@vger.kernel.org
Subject: Re: [2.6 patch] kill IN_STRING_C
Date: Mon, 8 Nov 2004 19:04:13 +0100
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References: <20041107142445.GH14308@stusta.de> <20041108161935.GC2456@wotan.suse.de> <20041108163101.GA13234@stusta.de>
In-Reply-To: <20041108163101.GA13234@stusta.de>
Cc: Adrian Bunk <bunk@stusta.de>
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On Monday 08 of November 2004 17:31, you wrote:
> On Mon, Nov 08, 2004 at 05:19:35PM +0100, Andi Kleen wrote:
> > > Rethinking it, I don't even understand the sprintf example in your
> > > changelog entry - shouldn't an inclusion of kernel.h always get it
> > > right?
> >
> > Newer gcc rewrites sprintf(buf,"%s",str) to strcpy(buf,str)
> > transparently.
>
> Which gcc is "Newer"?
>
> My gcc 3.4.2 didn't show this problem.

#include <stdio.h>
#include <string.h>
char buf[128];
void test(char *str)
{
    sprintf(buf, "%s", str);
}

gcc -Wall sp.c -S -O2 -fomit-frame-pointer -mregparm=3

        .file   "sp.c"
        .text
        .p2align 4,,15
.globl test
        .type   test, @function

test:
        movl    %eax, %edx
        movl    $buf, %eax
        jmp     strcpy

        .size   test, .-test
        .comm   buf,128,32
        .section        .note.GNU-stack,"",@progbits
        .ident  "GCC: (GNU) 3.4.3 (PLD Linux)"

-- 
/* Copyright (C) 2003, SCO, Inc. This is valuable Intellectual Property. */

                           #define say(x) lie(x)
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