port/stdio/puts.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"

#include "lint.h"
#include "file64.h"
#include "mtlib.h"
#include <sys/types.h>
#include <stdio.h>
#include <memory.h>
#include <thread.h>
#include <synch.h>
#include <limits.h>
#include "stdiom.h"
#include "mse.h"

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

    FLOCKFILE(lk, stdout);

    _SET_ORIENTATION_BYTE(stdout);

    if (_WRTCHK(stdout)) {
        FUNLOCKFILE(lk);
        return (EOF);
    }

    bufend = _bufend(stdout);

    ptrlen = strlen(ptr) + 1;   /* adding 1 for '\n' */
    for (; ; ptr += len, ptrlen -= len) {
        while ((n = bufend - (cptr = stdout->_ptr)) <= 0) /* full buf */
        {
            if (_xflsbuf(stdout) == EOF) {
                FUNLOCKFILE(lk);
                return (EOF);
            }
        }
        /*
         * n: number of available bytes in the buffer of stdout
         * ptrlen: number of remaining bytes in 'ptr' string
         *
         * If all remaining bytes in 'ptr' can be copied into
         * the buffer of stdout (ptrlen <= n), 'len' is set to
         * 'ptrlen'.  Otherwise, 'len' is set to 'n'.
         * Then, copies 'len' bytes from 'ptr' to the buffer
         * of stdout.
         */
        len = (c = (ptrlen <= n)) ? ptrlen : n;
        (void) memcpy(cptr, ptr, len);
        stdout->_cnt -= len;
        stdout->_ptr += len;
        if (_needsync(stdout, bufend))
            _bufsync(stdout, bufend);
        ndone += len;
        if (c) {
            /*
             * All bytes in 'ptr' can be copied into
             * the buffer of stdout.
             * Terminate the buffer of stdout with '\n'
             * and flush line buffer
             */
            stdout->_ptr[-1] = '\n';
            if (stdout->_flag & (_IONBF | _IOLBF)) {
                /* flush line */
                if (_xflsbuf(stdout) == EOF) {
                    FUNLOCKFILE(lk);
                    return (EOF);
                }
            }
            FUNLOCKFILE(lk);
            if (ndone <= INT_MAX)
                return ((int)ndone);
            else
                return (EOF);
        }
    }
}