port/print/fprintf.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 (c) 1988, 2011, Oracle and/or its affiliates. All rights reserved.
 */

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


/*
 * This symbol should not be defined, but there are some
 * miserable old compiler libraries that depend on it.
 */
#pragma weak _fprintf = fprintf

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

/*VARARGS2*/
int
fprintf(FILE *iop, const char *format, ...)
{
    ssize_t count;
    rmutex_t *lk;
    va_list ap;

    va_start(ap, format);

    /* Use F*LOCKFILE() macros because fprintf() 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 */
            _READ2WRT(iop);
        } else {
            /* else error */
            FUNLOCKFILE(lk);
            errno = EBADF;
            return (EOF);
        }
    }
    count = _ndoprnt(format, ap, iop, 0);

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

    FUNLOCKFILE(lk);

    /* error on overflow */
    if ((size_t)count > MAXINT) {
        errno = EOVERFLOW;
        return (EOF);
    }
    return ((int)count);
}

#ifndef _LP64

/*
 * 32-bit shadow function of fprintf().
 * 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 only exists in the 32-bit library.
 */

int
_fprintf_c89(FILE *iop, const char *format, ...)
{
    ssize_t count;
    va_list ap;

    va_start(ap, format);
    count = _vfprintf_c89(iop, format, ap);
    va_end(ap);
    return ((int)count);
}

#endif  /* _LP64 */