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download PDF document: XtCalloc.3.pdf

XtMalloc(3) XT FUNCTIONS 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 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 1.3.0 XtMalloc(3)