passing pointer to string between functions

[liats80]

Hi all
I was wondering if you could help me figure something out.
I have a pointer P to a string S. I have function A and function B.
Function A calls function B with the pointer P.
Function B moves pointer P along the string S.
When function B finishes and I'm back in function A, pointer P (in function A) stays in the same position it was before calling function B.
Function B cannot return the pointer P (since it returns another parameter).
Do I need to make the pointer P a global parameter or is there another way of solving this???
THANKS!!!
Liat.

[swoopy]

Since C passes parameters by value, to update a pointer, you must pass a pointer to pointer. For example:

int B(char **P)

To make it simpler in B to move P, you can declare within B a local pointer initialized to *P. And to call B from A:

char *P = S;
B(&P);

EDIT: Changed int to char since the reference was to a string.

[liats80]

ha ha sounds logical...
Thanks so much!

[liats80]

Hi again,

I've tried what swoopy has suggested, but I'm still getting the same problem (the pointer in the original function doesn't move).

I've done something like this:

int funB(**char p)
{
       char *c;
       c=*p;
       c++;
      fprintf(stderr,"after moving the pointer *c is: %c\n",*c);
      return 1;
}
int funA()
{
       int number;
       char *c;
       fprintf(stderr,"*c is: %c\n",*c);
       number=funB(&c);
       fprintf(stderr,"after calling funB *c is: %c\n",*c);
}

I'm pretty sure this is what i've done...
This doesn't work for me, is it suppose to? Or is something wrong with it?
THANKS AGAIN!
Liat.

[liats80]

Thanks anyways.