XtMalloc(3Xt)XtMalloc(3Xt)NAME
XtMalloc, XtCalloc, XtRealloc, XtFree, XtNew, XtNewString - memory man‐
agement functions
SYNOPSIS
char *XtMalloc(size);
Cardinal size;
char *XtCalloc(num, size);
Cardinal num;
Cardinal size;
char *XtRealloc(ptr, num);
char *ptr;
Cardinal num;
void XtFree(ptr);
char *ptr;
type *XtNew(type);
type;
String XtNewString(string);
String string;
ARGUMENTS
Specifies the number of bytes or array elements. Specifies a pointer
to the old storage or to the block of storage that is to be freed.
Specifies the size of an array element (in bytes) or the number of
bytes desired. Specifies a previously declared string. 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 con‐
tents; 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 insuffi‐
cient 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 XtEr‐
rorMsg. 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
XtMalloc(3Xt)
