Test for a variable or not

Lets say I have code like this:

Code:

---

inline int Len(char *p_chString){int length = 0;while( *p_chString++ ) ++length; return length;}

void RTrim(char *p_chString)
{
/*>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>*/
        char *buf;
/*<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<*/

        if(*p_chString == 0 || *p_chString == 0x00)        //If String Is Not Blank Or Errored
                return;

        buf = p_chString;
        buf += Len(p_chString) - 1;

        while (*buf == ' ' && Len(p_chString) )
                *buf-- = '\0';
}

---

Which trims spaces from the right side of a string. Now if I use it like so it works great:

Code:

---

        char cTemp[10];
        strncpy(cTemp," t    ",10);
        RTrim(cTemp);

---

Like it should. But lets say a stupid user comes along and tries this:

Code:

---

RTrim("SPACE    ");

---

Where you are not passing a variable. How can I test for that?

You dont. Document how the function is supposed to be called. If you are really worried, make a second parameter to be a destination buffer, that should be initialized before the function is called.

Z.

Thats what I plan to do, but I figured I would check. I thought maybe you could check the param to make it had a vaild memory allocation to it or some thing.

[EDIT]
YEAH POST 800!! ;):D

On a proper compiler it simply wouldn't be possible because "SPACE " would be of type const char * and you function expects char *.

But VC++ isn't a proper compiler...