port/print/vfprintf.c

	vfprintf.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

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


#include "synonyms.h"
#include <thread.h>
#include <mtlib.h>
#include <synch.h>
#include <stdarg.h>
#include <values.h>
#include <errno.h>
#include <sys/types.h>
#include "print.h"
#include "libc.h"
#include "mse.h"

/*
 * 32-bit shadow function of vfprintf() is 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: this function is only available in the 32-bit library.
 */

/*VARARGS2*/
int
#ifdef _C89_INTMAX32    /* _C89_INTMAX32 version in 32-bit libc only */
_vfprintf_c89(FILE *iop, const char *format, va_list ap)
#else
vfprintf(FILE *iop, const char *format, va_list ap)
#endif
{
    ssize_t count;
    rmutex_t *lk;

    /* Use F*LOCKFILE() macros because vfprintf() is not async-safe. */
    FLOCKFILE(lk, iop);

    _SET_ORIENTATION_BYTE(iop);

    if (!(iop->_flag & _IOWRT)) {
        /* if no write flag */
        if (iop->_flag & _IORW) {
            /* if ok, cause read-write */
            iop->_flag |= _IOWRT;
        } else {
            /* else error */
            FUNLOCKFILE(lk);
            errno = EBADF;
            return (EOF);
        }
    }
#ifdef _C89_INTMAX32
    count = _ndoprnt(format, ap, iop, _F_INTMAX32);
#else
    count = _ndoprnt(format, ap, iop, 0);
#endif

    /* check for error or EOF */
    if (FERROR(iop) || count == EOF) {
        FUNLOCKFILE(lk);
        return (EOF);
    }

    FUNLOCKFILE(lk);

    /* check for overflow */
    if ((size_t)count > MAXINT) {
        errno = EOVERFLOW;
        return (EOF);
    } else {
        return ((int)count);
    }
}