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Dark GDK / Password Masking

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AlexI

Years of Service

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Joined: 31st Dec 2004

Location: UK

Posted: 23rd Oct 2008 11:37

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Hi,
I have written the function which you input a string and it returns a masked password back:

+ Code Snippet

char* HidePassword(char* Password) {
	int Repeat=0;
	char* Output;

	Output=strcpy(Output,"");

	if (strcmp(Password,"")==0) {
		while (Repeat<=strlen(Password)-1) {
			Output=strcat(Output,"*");
			Repeat++;
		}
	}

	return Output;
}

However it just crashes the program

I cant see why

Any ideas why?
Thanks,
Alex

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IanM

Retired Moderator

Years of Service

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Joined: 11th Sep 2002

Location: In my moon base

Posted: 23rd Oct 2008 20:58

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You haven't allocated any storage for the Output pointer. strcpy doesn't create storage - strdup does that (which is the equivalent of malloc followed by strcpy).

Try this instead:

+ Code Snippet

char* HidePassword(char* Password) {
	// Make a copy of the password
	char* Output = strdup( Password );
	// Step over each character in the copy until the null byte
	for (char* Iter = Output; *Iter; ++Iter)
	{
		// Replace the character with an asterisk
		*Iter = '*';
	}
	// Pass back the copy.
	return Output;
}

[b]Utility plug-ins collection (updated 27/09/08) and
http://www.matrix1.demon.co.uk

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AlexI

Years of Service

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Joined: 31st Dec 2004

Location: UK

Posted: 24th Oct 2008 01:55

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Thanks that's perfect

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Dark GDK / Password Masking