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Re: call_external (IDL5.5) [message #29474]

Tue, 26 February 2002 10:43

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Reimar Bauer <r.bauer@fz-juelich.de> writes:

> James Kuyper wrote:
...
>> Which points out he importance of using "#include export.h" to create
>> the typedef, rather than copying the typedef into your own code.
>
> I agree to this and sure this was the main problem.
>
> The second problem comes from this two lines.
>
> strcpy(buf,path.s);
> buf[path.slen]='\0';
>
> I have learned that I have to do:
>
> buf[path.slen]='\0';
> strcpy(buf,path.s);

Reimar, this does not sound right. The use of strcpy() is rather
unsafe, and you should prefer strncpy(). Also, there is the risk that
the "path" string is longer than buf[]. Then what do you do?

Safer approach:

char buf[NCHAR];
int len;

if (path.slen >= NCHAR) len = NCHAR-1; else len = path.slen;
if (len > 0) strncpy(buf, path.s, len);
buf[len] = 0;

If the "path" is too long for the buf[], then this code truncates it.

Cheers,
Craig

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: call_external (IDL5.5) By: Craig Markwardt on Tue, 26 February 2002 10:43
		Re: call_external (IDL5.5) By: R.Bauer on Tue, 26 February 2002 08:58
		Re: call_external (IDL5.5) By: Mark Rivers on Mon, 25 February 2002 20:03
		Re: call_external (IDL5.5) By: James Kuyper on Mon, 25 February 2002 07:28
		Re: call_external (IDL5.5) By: Mark Rivers on Mon, 25 February 2002 06:56
		Re: call_external (IDL5.5) By: notspecified on Mon, 25 February 2002 05:56
		Re: call_external (IDL5.5) By: Gert Van de Wouwer on Mon, 25 February 2002 05:35
		Re: call_external (IDL5.5) By: R.Bauer on Mon, 25 February 2002 05:19
		Re: call_external (IDL5.5) By: Gert Van de Wouwer on Wed, 06 March 2002 06:42

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