How do i make an array of pointers for execvp

I am trying to use the execvp command and require an array of pointers for the 2nd argument.
I am storing the arguments in an array of strings. How would I turn that array of strings into an array of pointers?

Also, how can I terminate the array of pointers with a null pointer.

I was using the array of strings in the execvp 2nd argument but that was throwing errors and I was trying to make the last entry of the array a null pointer, using strcat and strcpy but both didn't work.

type **array_of_pointers;
array_of_pointers = malloc(NR_POINTERS * sizeof(type*));

The first hit for exec: http://cboard.cprogramming.com/c-pro...ed-string.html

But that's assuming you know how to click search and type a word, and click another button or two. I know, I know, it's asking a lot of you.


Quzah.

Sorry, I forgot to use the search function here. Was just googling.

Some questions about your code for storing from that thread.

Code:

---

char **args = NULL;
int argcount = 0;

while input
    pop a word off into a buffer
    char **temp;
    temp = realloc( args, 1 + argcount * sizeof *temp )
    if( temp )
    {
        args = temp;
        args[ argcount ] = malloc strlen buf + 1
        if( args[ argcount ] )
            strcpy( args[ argcount ], buffer )
        argcount++;
    }
realloc again, adding room for a NULL ptr, or do it at the start, before the loop

---

Do you need a (char *) before realloc? I couldn't really understand this line from the man page on realloc.

Quote:

---

The type of this pointer is void*, which can be cast to the desired type of data pointer in order to be dereferenceable.

---

Also, how would you add a NULL ptr in?

Strcpy does not let you put NULL as an argument.

Just assign the last pointer NULL:

Code:

---

args[ lastspot ] = NULL;

---

Quzah.