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      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) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #ifndef _C89_INTMAX32
     33 #pragma weak _vscanf = vscanf
     34 #pragma weak _vfscanf = vfscanf
     35 #pragma weak _vsscanf = vsscanf
     36 #endif
     37 
     38 #include "lint.h"
     39 #include "file64.h"
     40 #include "mtlib.h"
     41 #include <stdio.h>
     42 #include <stdarg.h>
     43 #include <string.h>
     44 #include <thread.h>
     45 #include <synch.h>
     46 #include "libc.h"
     47 #include "stdiom.h"
     48 #include "mse.h"
     49 #include <stdio_ext.h>
     50 
     51 
     52 /*
     53  * 32-bit shadow functions _vscanf_c89(), _vfscanf_c89(), _vsscanf_c89()
     54  * are included here.
     55  * When using the c89 compiler to build 32-bit applications, the size
     56  * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
     57  * The shadow function uses 32-bit size of intmax_t for %j conversion.
     58  * The #pragma redefine_extname in <stdio.h> selects the proper routine
     59  * at compile time for the user application.
     60  * NOTE: the shadow function only exists in the 32-bit library.
     61  */
     62 
     63 int
     64 #ifdef _C89_INTMAX32	/* _C89_INTMAX32 version in 32-bit libc only */
     65 _vscanf_c89(const char *fmt, va_list ap)
     66 #else
     67 vscanf(const char *fmt, va_list ap)
     68 #endif
     69 {
     70 	rmutex_t	*lk;
     71 	int	ret;
     72 
     73 	FLOCKFILE(lk, stdin);
     74 
     75 	_SET_ORIENTATION_BYTE(stdin);
     76 
     77 #ifdef _C89_INTMAX32
     78 	ret = __doscan_u(stdin, fmt, ap, _F_INTMAX32);
     79 #else
     80 	ret = __doscan_u(stdin, fmt, ap, 0);
     81 #endif
     82 
     83 	FUNLOCKFILE(lk);
     84 	return (ret);
     85 }
     86 
     87 int
     88 #ifdef _C89_INTMAX32	/* _C89_INTMAX32 version in 32-bit libc only */
     89 _vfscanf_c89(FILE *iop, const char *fmt, va_list ap)
     90 #else
     91 vfscanf(FILE *iop, const char *fmt, va_list ap)
     92 #endif
     93 {
     94 	rmutex_t	*lk;
     95 	int	ret;
     96 
     97 	FLOCKFILE(lk, iop);
     98 
     99 	_SET_ORIENTATION_BYTE(iop);
    100 
    101 #ifdef _C89_INTMAX32
    102 	ret = __doscan_u(iop, fmt, ap, _F_INTMAX32);
    103 #else
    104 	ret = __doscan_u(iop, fmt, ap, 0);
    105 #endif
    106 	FUNLOCKFILE(lk);
    107 	return (ret);
    108 }
    109 
    110 int
    111 #ifdef _C89_INTMAX32	/* _C89_INTMAX32 version in 32-bit libc only */
    112 _vsscanf_c89(const char *str, const char *fmt, va_list ap)
    113 #else
    114 vsscanf(const char *str, const char *fmt, va_list ap)
    115 #endif
    116 {
    117 	FILE strbuf;
    118 
    119 	/*
    120 	 * The dummy FILE * created for sscanf has the _IOWRT
    121 	 * flag set to distinguish it from scanf and fscanf
    122 	 * invocations.
    123 	 */
    124 	strbuf._flag = _IOREAD | _IOWRT;
    125 	strbuf._ptr = strbuf._base = (unsigned char *)str;
    126 	strbuf._cnt = strlen(str);
    127 	SET_FILE(&strbuf, _NFILE);
    128 
    129 	/*
    130 	 * Mark the stream so that routines called by __doscan_u()
    131 	 * do not do any locking. In particular this avoids a NULL
    132 	 * lock pointer being used by getc() causing a core dump.
    133 	 * See bugid -  1210179 program SEGV's in sscanf if linked with
    134 	 * the libthread.
    135 	 * This also makes sscanf() quicker since it does not need
    136 	 * to do any locking.
    137 	 */
    138 	if (__fsetlocking(&strbuf, FSETLOCKING_BYCALLER) == -1) {
    139 		return (-1);	/* this should never happen */
    140 	}
    141 
    142 	/* as this stream is local to this function, no locking is be done */
    143 #ifdef _C89_INTMAX32
    144 	return (__doscan_u(&strbuf, fmt, ap, _F_INTMAX32));
    145 #else
    146 	return (__doscan_u(&strbuf, fmt, ap, 0));
    147 #endif
    148 }
    149