XtMalloc(3) XT FUNCTIONS XtMalloc(3)
XtMalloc, XtCalloc, XtRealloc, XtReallocArray, XtFree, XtNew,
XtNewString - memory management functions
#include <X11/Intrinsic.h>
char *XtMalloc(Cardinal size);
char *XtCalloc(Cardinal num, Cardinal size);
char *XtRealloc(char *ptr, Cardinal size);
void *XtReallocArray(void *ptr, Cardinal num, Cardinal size);
void XtFree(char *ptr);
type *XtNew(type);
String XtNewString(String string);
Cardinal XtAsprintf(char **new_string, const char *format, ...);
num Specifies the number of 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)
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 and XtReallocArray functions change the size of a block
of storage (possibly moving it). Then, they copy the old contents
(or as much as will fit) into the new block and free the old block.
If there is insufficient memory to allocate the new block, or the
calculations for the size of the new block would cause an integer
overflow, these functions call XtErrorMsg. If ptr is NULL, these
functions allocate the new storage without copying the old contents;
that is, they simply call 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 a new string which is a duplicate of
string. If there is insufficient memory to allocate the new block,
or the argument is NULL XtNewString returns NULL. The memory can be
freed with XtFree.
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.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.3.1 XtMalloc(3)
NAME
XtMalloc, XtCalloc, XtRealloc, XtReallocArray, XtFree, XtNew,
XtNewString - memory management functions
SYNTAX
#include <X11/Intrinsic.h>
char *XtMalloc(Cardinal size);
char *XtCalloc(Cardinal num, Cardinal size);
char *XtRealloc(char *ptr, Cardinal size);
void *XtReallocArray(void *ptr, Cardinal num, Cardinal size);
void XtFree(char *ptr);
type *XtNew(type);
String XtNewString(String string);
Cardinal XtAsprintf(char **new_string, const char *format, ...);
ARGUMENTS
num Specifies the number of 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 and XtReallocArray functions change the size of a block
of storage (possibly moving it). Then, they copy the old contents
(or as much as will fit) into the new block and free the old block.
If there is insufficient memory to allocate the new block, or the
calculations for the size of the new block would cause an integer
overflow, these functions call XtErrorMsg. If ptr is NULL, these
functions allocate the new storage without copying the old contents;
that is, they simply call 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 a new string which is a duplicate of
string. If there is insufficient memory to allocate the new block,
or the argument is NULL XtNewString returns NULL. The memory can be
freed with XtFree.
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 1.3.1 XtMalloc(3)