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);

       Cardinal XtAsprintf(String *new_string, const char *format, ...);

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.

       new_string
                 Specifies a pointer to write a newly allocated string to.

       format    Specifies a formatting string as defined by sprintf(3c)

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))

       The XtAsprintf function allocates space for a string large enough to hold the string
       specified by the sprintf(3c) format pattern when used with the remaining arguments, and
       fills it with the formatted results.  The address of the allocated string is placed into
       the pointer passed as ret.  The length of the string (not including the terminating null
       byte) is returned.  If there is insufficient memory to allocate the new block, XtAsprintf
       calls XtErrorMsg.

SEE ALSO

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface