array_allocate(3) [debian man page]

array_allocate(3)					     Library Functions Manual						 array_allocate(3)

NAME

       array_allocate - make sure array has at least n elements allocated

SYNTAX

       #include <array.h>

       void* array_allocate(array* x, uint64 membersize, int64 pos);

	 array x;
	 int64 pos;
	 t* p = array_allocate(&x,sizeof(t),pos);

DESCRIPTION

       array_allocate  makes sure that enough bytes are allocated in x for at least pos+1 objects of type t. (The size of t must be positive; oth-
       erwise the effects are undefined.) If not enough bytes are allocated (or x is unallocated), array_allocate allocates more bytes, moving the
       dynamically allocated region if necessary.  array_allocate often allocates somewhat more bytes than necessary, to save time later.

       array_allocate  then  makes sure that the number of bytes initialized covers at least those pos+1 objects. If not enough bytes are initial-
       ized, array_allocate initializes more bytes (setting them to 0), up to exactly the end of the pos+1st object.

       array_allocate then returns a pointer to the pos+1st object; i.e., object number pos, with objects numbered starting at 0. This pointer can
       be  used  to  change  or  inspect  the  object.	The  pointer  can  continue to be used through subsequent calls to array_get, array_start,
       array_length, and array_bytes, but it must not be used after any other operations on this array.

       If something goes wrong, array_allocate returns 0, setting errno appropriately, without touching x. In particular, array_allocate returns 0
       if

       o      x has failed, or

       o      pos is negative, or

       o      not enough memory is available.

       array_allocate does not change x to have failed; if you want to do that, use array_fail.

SEE ALSO

       array_get(3), array_start(3), array_fail(3)

																 array_allocate(3)