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 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