port/stdio/vscanf.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

#pragma ident   "%Z%%M% %I% %E% SMI"

#ifndef _C89_INTMAX32
#pragma weak _vscanf = vscanf
#pragma weak _vfscanf = vfscanf
#pragma weak _vsscanf = vsscanf
#endif

#include "lint.h"
#include "file64.h"
#include "mtlib.h"
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <thread.h>
#include <synch.h>
#include "libc.h"
#include "stdiom.h"
#include "mse.h"
#include <stdio_ext.h>


/*
 * 32-bit shadow functions _vscanf_c89(), _vfscanf_c89(), _vsscanf_c89()
 * are included here.
 * When using the c89 compiler to build 32-bit applications, the size
 * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits.
 * The shadow function uses 32-bit size of intmax_t for %j conversion.
 * The #pragma redefine_extname in <stdio.h> selects the proper routine
 * at compile time for the user application.
 * NOTE: the shadow function only exists in the 32-bit library.
 */

int
#ifdef _C89_INTMAX32    /* _C89_INTMAX32 version in 32-bit libc only */
_vscanf_c89(const char *fmt, va_list ap)
#else
vscanf(const char *fmt, va_list ap)
#endif
{
    rmutex_t    *lk;
    int ret;

    FLOCKFILE(lk, stdin);

    _SET_ORIENTATION_BYTE(stdin);

#ifdef _C89_INTMAX32
    ret = __doscan_u(stdin, fmt, ap, _F_INTMAX32);
#else
    ret = __doscan_u(stdin, fmt, ap, 0);
#endif

    FUNLOCKFILE(lk);
    return (ret);
}

int
#ifdef _C89_INTMAX32    /* _C89_INTMAX32 version in 32-bit libc only */
_vfscanf_c89(FILE *iop, const char *fmt, va_list ap)
#else
vfscanf(FILE *iop, const char *fmt, va_list ap)
#endif
{
    rmutex_t    *lk;
    int ret;

    FLOCKFILE(lk, iop);

    _SET_ORIENTATION_BYTE(iop);

#ifdef _C89_INTMAX32
    ret = __doscan_u(iop, fmt, ap, _F_INTMAX32);
#else
    ret = __doscan_u(iop, fmt, ap, 0);
#endif
    FUNLOCKFILE(lk);
    return (ret);
}

int
#ifdef _C89_INTMAX32    /* _C89_INTMAX32 version in 32-bit libc only */
_vsscanf_c89(const char *str, const char *fmt, va_list ap)
#else
vsscanf(const char *str, const char *fmt, va_list ap)
#endif
{
    FILE strbuf;

    /*
     * The dummy FILE * created for sscanf has the _IOWRT
     * flag set to distinguish it from scanf and fscanf
     * invocations.
     */
    strbuf._flag = _IOREAD | _IOWRT;
    strbuf._ptr = strbuf._base = (unsigned char *)str;
    strbuf._cnt = strlen(str);
    SET_FILE(&strbuf, _NFILE);

    /*
     * Mark the stream so that routines called by __doscan_u()
     * do not do any locking. In particular this avoids a NULL
     * lock pointer being used by getc() causing a core dump.
     * See bugid -  1210179 program SEGV's in sscanf if linked with
     * the libthread.
     * This also makes sscanf() quicker since it does not need
     * to do any locking.
     */
    if (__fsetlocking(&strbuf, FSETLOCKING_BYCALLER) == -1) {
        return (-1);    /* this should never happen */
    }

    /* as this stream is local to this function, no locking is be done */
#ifdef _C89_INTMAX32
    return (__doscan_u(&strbuf, fmt, ap, _F_INTMAX32));
#else
    return (__doscan_u(&strbuf, fmt, ap, 0));
#endif
}