MirOS Manual: XtCalloc(3), XtFree(3), XtMalloc(3), XtNew(3), XtNewString(3), XtRealloc(3)


XtMalloc(3Xt)             XT FUNCTIONS              XtMalloc(3Xt)

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 initial-
     izes 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 con-
     tents (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.

XFree86                   Version 4.5.0                         1

XtMalloc(3Xt)             XT FUNCTIONS              XtMalloc(3Xt)

     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

XFree86                   Version 4.5.0                         2

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