Odd SEGFAULT Problem

[aviraldg]

I'm having a SEGFAULT on the following program. Weird thing is that it happens randomly with different "str"s (ie. user input; check main() for more info) and my debugger shows me that the getToken function is working and returning the correct answer.

#include <stdio.h>
#include <string.h>
#include <ctype.h>

char* getToken(char *src, unsigned int pos=0)
{
	char *token=new char[strlen(src)];
	unsigned int i=0;
	while(!isblank(src[pos]))
	{
		token[i]=src[pos];
		pos++;
		i++;
	}
	token[pos]='\0';
	return token;
}

int main(int argc,char* argv[])
{
	puts("Enter command:");
	char *str;
	str=gets(str);
	char *nstr=getToken(str);
	puts(nstr);
	return 0;
}

Note: The getToken(...) function is supposed to function like strtok , returning tokens.
eg.
Call: getToken("This a sample for testing this function"); (Currently works)
Return: "This"

Call: getToken("Anoth er sample",8); (Currently works)
Return: "sample"

Call: getToken("avira ldg aviraldg"); (SEGFAULTs)
Returns: n/a
Expected return: "aviraldg"

Also, please note that this is not homework , and I'm trying to build a simple "some" script(ing language) parser here...

[JosAH]

Your 'str' variable doesn't point to a valid char buffer in your main() function.

kind regards,

Jos

[newb16]

And ( just in case ) in token function you should allocate strlen(str)+1 bytes to have place for trailing \0 if the string consists of one token.