/*
 * 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   */

/*
 * Ptr args aren't checked for NULL because the program would be a
 * catastrophic mess anyway.  Better to abort than just to return NULL.
 */
#include "lint.h"
#include "file64.h"
#include "mtlib.h"
#include <stdio.h>
#include <string.h>
#include <thread.h>
#include <synch.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include "stdiom.h"
#include "mse.h"

int
fputs(const char *ptr, FILE *iop)
{
        ssize_t ndone = 0L, n;
        unsigned char *cptr, *bufend;
        rmutex_t *lk;
        size_t  ptrlen;
        size_t  len = 0;
        int     c;

        FLOCKFILE(lk, iop);

        _SET_ORIENTATION_BYTE(iop);

        if (_WRTCHK(iop)) {
                FUNLOCKFILE(lk);
                return (EOF);
        }
        bufend = _bufend(iop);

        ptrlen = strlen(ptr);
        if ((iop->_flag & _IONBF) == 0) {
                for (; ; ptr += len, ptrlen -= len) {
                        while ((n = bufend - (cptr = iop->_ptr)) <= 0) {
                                /* full buf */
                                if (_xflsbuf(iop) == EOF) {
                                        FUNLOCKFILE(lk);
                                        return (EOF);
                                }
                        }
                        /*
                         * n: number of available bytes in the buffer of 'iop'
                         * ptrlen: number of remaining bytes in 'ptr' string
                         *
                         * If all remaining bytes in 'ptr' can be copied into
                         * the buffer of 'iop' (ptrlen <= n), 'len' is set to
                         * 'ptrlen'.  Otherwise, 'len' is set to 'n'.
                         * Then, copies 'len' bytes from 'ptr' to the buffer
                         * of 'iop'.
                         */
                        len = (c = (ptrlen <= n)) ? ptrlen : n;
                        (void) memcpy(cptr, ptr, len);
                        iop->_cnt -= len;
                        iop->_ptr += len;
                        if (_needsync(iop, bufend))
                                _bufsync(iop, bufend);
                        ndone += len;
                        if (c) {
                                /*
                                 * All bytes in 'ptr' have been copied into
                                 * the buffer of 'iop'.
                                 * Flush buffer if line-buffered
                                 */
                                if (iop->_flag & _IOLBF)
                                        if (_xflsbuf(iop) == EOF) {
                                                FUNLOCKFILE(lk);
                                                return (EOF);
                                        }
                                FUNLOCKFILE(lk);
                                if (ndone <= INT_MAX)
                                        return ((int)ndone);
                                else
                                        return (EOF);
                        }
                }
        } else {
                /* write out to an unbuffered file */
                ssize_t num_wrote;
                ssize_t count = (ssize_t)ptrlen;

                while ((num_wrote = _xwrite(iop, ptr, (size_t)count)) !=
                    count) {
                        if (num_wrote <= 0) {
                                if (!cancel_active())
                                        iop->_flag |= _IOERR;
                                FUNLOCKFILE(lk);
                                return (EOF);
                        }
                        count -= num_wrote;
                        ptr += num_wrote;
                }
                FUNLOCKFILE(lk);
                if (ptrlen <= INT_MAX)
                        return ((int)ptrlen);
                else
                        return (EOF);
        }
}