port/stdio/fputs.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"


/*
 * 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;
        int fd = GET_FD(iop);

        while ((num_wrote = write(fd, 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);
    }
}