NAME
XtMalloc, XtCalloc, XtRealloc, XtFree, XtNew, XtNewString - memory
management functions
SYNTAX
char *XtMalloc(Cardinal size);
char *XtCalloc(Cardinal num, Cardinal size);
char *XtRealloc(char *ptr, Cardinal num);
void XtFree(char *ptr);
type *XtNew(type);
String XtNewString(String string);
ARGUMENTS
num Specifies the number of bytes or array elements.
ptr Specifies a pointer to the old storage or to the block of
storage that is to be freed.
size Specifies the size of an array element (in bytes) or the
number of bytes desired.
string Specifies a previously declared string.
type Specifies a previously declared data type.
DESCRIPTION
The XtMalloc functions returns a pointer to a block of storage of at
least the specified size bytes. If there is insufficient memory to
allocate the new block, XtMalloc calls XtErrorMsg.
The XtCalloc function allocates space for the specified number of array
elements of the specified size and initializes the space to zero. If
there is insufficient memory to allocate the new block, XtCalloc calls
XtErrorMsg.
The XtRealloc function changes the size of a block of storage (possibly
moving it). Then, it copies the old contents (or as much as will fit)
into the new block and frees the old block. If there is insufficient
memory to allocate the new block, XtRealloc calls XtErrorMsg. If ptr
is NULL, XtRealloc allocates the new storage without copying the old
contents; that is, it simply calls XtMalloc.
The XtFree function returns storage and allows it to be reused. If ptr
is NULL, XtFree returns immediately.
XtNew returns a pointer to the allocated storage. If there is
insufficient memory to allocate the new block, XtNew calls XtErrorMsg.
XtNew is a convenience macro that calls XtMalloc with the following
arguments specified:
((type *) XtMalloc((unsigned) sizeof(type))
XtNewString returns a pointer to the allocated storage. If there is
insufficient memory to allocate the new block, XtNewString calls
XtErrorMsg. XtNewString is a convenience macro that calls XtMalloc
with the following arguments specified:
(strcpy(XtMalloc((unsigned) strlen(str) + 1), str))
SEE ALSO
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface