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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include "lint.h"
     33 #include "file64.h"
     34 #include "mtlib.h"
     35 #include <sys/types.h>
     36 #include <stdio.h>
     37 #include <memory.h>
     38 #include <thread.h>
     39 #include <synch.h>
     40 #include <limits.h>
     41 #include "stdiom.h"
     42 #include "mse.h"
     43 
     44 int
     45 puts(const char *ptr)
     46 {
     47 	ssize_t ndone = 0L, n;
     48 	unsigned char *cptr, *bufend;
     49 	rmutex_t *lk;
     50 	size_t	ptrlen;
     51 	size_t	len = 0;
     52 	int	c;
     53 
     54 	FLOCKFILE(lk, stdout);
     55 
     56 	_SET_ORIENTATION_BYTE(stdout);
     57 
     58 	if (_WRTCHK(stdout)) {
     59 		FUNLOCKFILE(lk);
     60 		return (EOF);
     61 	}
     62 
     63 	bufend = _bufend(stdout);
     64 
     65 	ptrlen = strlen(ptr) + 1;	/* adding 1 for '\n' */
     66 	for (; ; ptr += len, ptrlen -= len) {
     67 		while ((n = bufend - (cptr = stdout->_ptr)) <= 0) /* full buf */
     68 		{
     69 			if (_xflsbuf(stdout) == EOF) {
     70 				FUNLOCKFILE(lk);
     71 				return (EOF);
     72 			}
     73 		}
     74 		/*
     75 		 * n: number of available bytes in the buffer of stdout
     76 		 * ptrlen: number of remaining bytes in 'ptr' string
     77 		 *
     78 		 * If all remaining bytes in 'ptr' can be copied into
     79 		 * the buffer of stdout (ptrlen <= n), 'len' is set to
     80 		 * 'ptrlen'.  Otherwise, 'len' is set to 'n'.
     81 		 * Then, copies 'len' bytes from 'ptr' to the buffer
     82 		 * of stdout.
     83 		 */
     84 		len = (c = (ptrlen <= n)) ? ptrlen : n;
     85 		(void) memcpy(cptr, ptr, len);
     86 		stdout->_cnt -= len;
     87 		stdout->_ptr += len;
     88 		if (_needsync(stdout, bufend))
     89 			_bufsync(stdout, bufend);
     90 		ndone += len;
     91 		if (c) {
     92 			/*
     93 			 * All bytes in 'ptr' can be copied into
     94 			 * the buffer of stdout.
     95 			 * Terminate the buffer of stdout with '\n'
     96 			 * and flush line buffer
     97 			 */
     98 			stdout->_ptr[-1] = '\n';
     99 			if (stdout->_flag & (_IONBF | _IOLBF)) {
    100 				/* flush line */
    101 				if (_xflsbuf(stdout) == EOF) {
    102 					FUNLOCKFILE(lk);
    103 					return (EOF);
    104 				}
    105 			}
    106 			FUNLOCKFILE(lk);
    107 			if (ndone <= INT_MAX)
    108 				return ((int)ndone);
    109 			else
    110 				return (EOF);
    111 		}
    112 	}
    113 }
    114