path: root/libXt/man/XtMalloc.man

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.ds tk X Toolkit
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.ds xL Xlib \- C Language X Interface
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.TH XtMalloc __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtMalloc, XtCalloc, XtRealloc, XtFree, XtNew, XtNewString \- memory management functions
.SH SYNTAX
.HP
char *XtMalloc(Cardinal \fIsize\fP); 
.HP
char *XtCalloc(Cardinal \fInum\fP, Cardinal \fIsize\fP); 
.HP
char *XtRealloc(char *\fIptr\fP, Cardinal \fInum\fP); 
.HP
void XtFree(char *\fIptr\fP); 
.HP
\fItype\fP *XtNew(\fItype\fP); 
.HP
String XtNewString(String \fIstring\fP); 
.HP
Cardinal XtAsprintf(String *\fInew_string\fP, const char *\fIformat\fP, ...);
.SH ARGUMENTS
.IP \fInum\fP 1i
Specifies the number of bytes or array elements.
.ds Po to the old storage or to the block of storage that is to be freed
.IP \fIptr\fP 1i
Specifies a pointer \*(Po.
.IP \fIsize\fP 1i
Specifies the size of an array element (in bytes) or the number of bytes
desired.
.IP \fIstring\fP 1i
Specifies a previously declared string.
.IP \fItype\fP 1i
Specifies a previously declared data type.
.IP \fInew_string\fP 1i
Specifies a pointer to write a newly allocated string to.
.IP \fIformat\fP 1i
Specifies a formatting string as defined by sprintf(3c)
.SH DESCRIPTION
The
.ZN 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,
.ZN XtMalloc
calls
.ZN XtErrorMsg .
.LP
The
.ZN 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,
.ZN XtCalloc
calls
.ZN XtErrorMsg .
.LP
The
.ZN 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,
.ZN XtRealloc
calls
.ZN XtErrorMsg .
If ptr is NULL,
.ZN XtRealloc
allocates the new storage without copying the old contents;
that is, it simply calls
.ZN XtMalloc .
.LP
The
.ZN XtFree
function returns storage and allows it to be reused.
If ptr is NULL,
.ZN XtFree
returns immediately.
.LP
.ZN XtNew
returns a pointer to the allocated storage.
If there is insufficient memory to allocate the new block,
.ZN XtNew
calls
.ZN XtErrorMsg .
.ZN XtNew
is a convenience macro that calls
.ZN XtMalloc
with the following arguments specified:
.LP
.Ds
.TA .5i
.ta .5i
((type *) XtMalloc((unsigned) sizeof(type))
.De
.LP
.ZN XtNewString
returns a pointer to the allocated storage.
If there is insufficient memory to allocate the new block,
.ZN XtNewString
calls
.ZN XtErrorMsg .
.ZN XtNewString
is a convenience macro that calls
.ZN XtMalloc
with the following arguments specified:
.LP
.Ds 
.TA .5i
.ta .5i
(strcpy(XtMalloc((unsigned) strlen(str) + 1), str))
.De
.LP
The
.ZN 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,
.ZN XtAsprintf
calls
.ZN XtErrorMsg .
.SH "SEE ALSO"
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP