XtMalloc(3) XT FUNCTIONS XtMalloc(3)

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

X Version 11 libXt 1.1.5 XtMalloc(3)