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     X Version 11 (1 September 1988)                 XtMalloc(Xt)



     NAME
          XtMalloc, XtCalloc, XtRealloc, XtFree, XtNew, XtNewString -
          memory management functions


     SYNTAX
          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
          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


     (printed 2/14/90) (1 September 1988)            XtMalloc(Xt)