1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1986 AT&T */
28 /* All Rights Reserved */
29
30 #include "lint.h"
31 #include "file64.h"
32 #include <stdio.h>
33 #include <stdarg.h>
34 #include <stdlib.h>
35 #include <widec.h>
36 #include <string.h>
37 #include "libc.h"
38 #include "stdiom.h"
39
40 /*
41 * wsscanf -- this function will read wchar_t characters from
42 * wchar_t string according to the conversion format.
43 * Note that the performance degrades if the intermediate
44 * result of conversion exceeds 1024 bytes due to the
45 * use of malloc() on each call.
46 * We should implement wchar_t version of doscan()
47 * for better performance.
48 */
49 #define MAXINSTR 1024
50
51 int
wsscanf(wchar_t * string,const char * format,...)52 wsscanf(wchar_t *string, const char *format, ...)
53 {
54 va_list ap;
55 size_t i;
56 char stackbuf[MAXINSTR];
57 char *tempstring = stackbuf;
58 size_t malloced = 0;
59 int j;
60
61 i = wcstombs(tempstring, string, MAXINSTR);
62 if (i == (size_t)-1)
63 return (-1);
64
65 if (i == MAXINSTR) { /* The buffer was too small. Malloc it. */
66 tempstring = malloc(malloced = MB_CUR_MAX*wcslen(string)+1);
67 if (tempstring == 0)
68 return (-1);
69 i = wcstombs(tempstring, string, malloced); /* Try again. */
70 if (i == (size_t)-1) {
71 free(tempstring);
72 return (-1);
73 }
74 }
75
76 va_start(ap, format);
77 j = vsscanf(tempstring, format, ap);
78 va_end(ap);
79 if (malloced) free(tempstring);
80 return (j);
81 }
82