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("Another sample",8); (Currently works)
Return: "sample"

Call: getToken("aviraldg 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.