1 /*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17 /* doc in vfwprintf.c */
18
19 #if defined(LIBC_SCCS) && !defined(lint)
20 static char sccsid[] = "%W% (Berkeley) %G%";
21 #endif /* LIBC_SCCS and not lint */
22
23 #define _DEFAULT_SOURCE
24 #include <_ansi.h>
25 #include <stdio.h>
26 #include <wchar.h>
27 #include <limits.h>
28 #include <stdarg.h>
29 #include <errno.h>
30
31 #include "local.h"
32
33 int
vswprintf(wchar_t * str,size_t size,const wchar_t * fmt,va_list ap)34 vswprintf (
35 wchar_t *str,
36 size_t size,
37 const wchar_t *fmt,
38 va_list ap)
39 {
40 int ret;
41 FILE f;
42
43 if (size > INT_MAX / sizeof (wchar_t))
44 {
45 _REENT_ERRNO(ptr) = EOVERFLOW; /* POSIX extension */
46 return EOF;
47 }
48 f._flags = __SWR | __SSTR;
49 f._bf._base = f._p = (unsigned char *) str;
50 f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0);
51 f._file = -1; /* No file. */
52 ret = svfwprintf ( &f, fmt, ap);
53 /* svfwprintf( so add one if
54 * appropriate, which is whenever size is > 0. _svfwprintf_r() stops
55 * after n-1, so always just put at the end. */
56 if (size > 0) {
57 *(wchar_t *)f._p = L'\0'; /* terminate the string */
58 }
59 if(ret >= 0 && (size_t) ret >= size) {
60 /* _svfwprintf_r() returns how many wide characters it would have printed
61 * if there were enough space. Return an error if too big to fit in str,
62 * unlike snprintf, which returns the size needed. */
63 _REENT_ERRNO(ptr) = EOVERFLOW; /* POSIX extension */
64 ret = -1;
65 }
66 return ret;
67 }
68
