usr/src/lib/libc/port/stdio/puts.c

   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 }