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 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "lint.h" 33 #include "file64.h" 34 #include <stdio.h> 35 #include <stdarg.h> 36 #include <stdlib.h> 37 #include <widec.h> 38 #include <string.h> 39 #include "libc.h" 40 #include "stdiom.h" 41 42 /* 43 * wsscanf -- this function will read wchar_t characters from 44 * wchar_t string according to the conversion format. 45 * Note that the performance degrades if the intermediate 46 * result of conversion exceeds 1024 bytes due to the 47 * use of malloc() on each call. 48 * We should implement wchar_t version of doscan() 49 * for better performance. 50 */ 51 #define MAXINSTR 1024 52 53 int 54 wsscanf(wchar_t *string, const char *format, ...) 55 { 56 va_list ap; 57 size_t i; 58 char stackbuf[MAXINSTR]; 59 char *tempstring = stackbuf; 60 size_t malloced = 0; 61 int j; 62 63 i = wcstombs(tempstring, string, MAXINSTR); 64 if (i == (size_t)-1) 65 return (-1); 66 67 if (i == MAXINSTR) { /* The buffer was too small. Malloc it. */ 68 tempstring = malloc(malloced = MB_CUR_MAX*wcslen(string)+1); 69 if (tempstring == 0) 70 return (-1); 71 i = wcstombs(tempstring, string, malloced); /* Try again. */ 72 if (i == (size_t)-1) { 73 free(tempstring); 74 return (-1); 75 } 76 } 77 78 va_start(ap, format); 79 j = vsscanf(tempstring, format, ap); 80 va_end(ap); 81 if (malloced) free(tempstring); 82 return (j); 83 } 84