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Article #432

Re: EMX library bug.

#432
From: Kai-Uwe Rommel
Date: Thu, 23 Jul 1992 07:33
31 lines
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In article <1992Jul22.185306.10692@ampex.com> cjensen@ampex.com (Colin Jensen) writes:
>In article <ReiBoB5w164w@dvss.UUCP> dvss!jtroy@udel.edu (Jay Troy) writes:
>>I think I've discovered an EMX library bug.  The standard library function
>>strtok causes an access violation in every combination that I've tried.  The
>>following simple C program illustrates this problem:
>
>>    char *ch = "3.4 4.1";
>>    strcpy(temp, strtok(ch," "));
>
>I don't know anything about EMX, but your code is certainly problematic.
>A C compiler is free to store strings constants like "3.4 4.1" in 
>read-only memory [hence their name].  Since strtok will try to write 
>into that memory, an access violation should be expected.
>
>To be portable, you need to copy that string either into an automatic variable
>or copy it into some malloc'ed memory.
>
>Under UNIX, you can pass gcc the option -fwritable-strings to tell gcc you
>really want to be able to write into string constants.  Perhaps this would
>solve your problem with EMX.
>-- 
>Colin Jensen (cjensen@ampex.com)

Yes, -fwritable-strings solves this problem. Try it.

Kai Uwe Rommel

/* Kai Uwe Rommel --- rommel@informatik.tu-muenchen.de */

DOS ... is still a real mode only non-reentrant interrupt
handler, and always will be.                -Russell Williams
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Message-ID: <1992Jul23.073307.10996@Informatik.TU-Muenchen.DE>
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!news.netmbx.de!zrz.tu-berlin.de!math.fu-berlin.de!informatik.tu-muenchen.de!rommel
References: <ReiBoB5w164w@dvss.UUCP> <1992Jul22.185306.10692@ampex.com>

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From: rommel@Informatik.TU-Muenchen.DE (Kai-Uwe Rommel)
Subject: Re: EMX library bug.
References: <ReiBoB5w164w@dvss.UUCP> <1992Jul22.185306.10692@ampex.com>
Sender: news@Informatik.TU-Muenchen.DE (USENET Newssystem)
Organization: Technische Universitaet Muenchen, Germany
Date: Thu, 23 Jul 1992 07:33:07 GMT
Message-ID: <1992Jul23.073307.10996@Informatik.TU-Muenchen.DE>
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