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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1989 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 3.6 */
31
32 /*LINTLIBRARY*/
33 /*
34 * This version writes directly to the buffer rather than looping on putc.
35 * Ptr args aren't checked for NULL because the program would be a
36 * catastrophic mess anyway. Better to abort than just to return NULL.
37 *
38 * This version does buffered writes larger than BUFSIZ directly, when
39 * the buffer is empty.
40 */
41 #include <stdio.h>
42 #include "stdiom.h"
43
44 #define MIN(x, y) (x < y ? x : y)
45
46 extern char *memcpy();
47
48 int
fwrite(ptr,size,count,iop)49 fwrite(ptr, size, count, iop)
50 char *ptr;
51 int size, count;
52 register FILE *iop;
53 {
54 register unsigned nleft;
55 register int n;
56 register unsigned char *cptr, *bufend;
57 register unsigned char *prev_ptr;
58
59 if (size <= 0 || count <= 0 || _WRTCHK(iop))
60 return (0);
61
62 bufend = iop->_base + iop->_bufsiz;
63 nleft = count*size;
64
65 /* if the file is unbuffered, or if the iop->ptr = iop->base, and there
66 is > BUFSZ chars to write, we can do a direct write */
67 prev_ptr = iop->_ptr;
68 if (iop->_base >= iop->_ptr) { /*this covers the unbuffered case, too*/
69 if (((iop->_flag & _IONBF) != 0) || (nleft >= BUFSIZ)) {
70 if ((n=write(fileno(iop),ptr,nleft)) != nleft)
71 {
72 iop->_flag |= _IOERR;
73 n = (n >= 0) ? n : 0;
74 }
75 return n/size;
76 }
77 }
78 /* Put characters in the buffer */
79 /* note that the meaning of n when just starting this loop is
80 irrelevant. It is defined in the loop */
81 for (; ; ptr += n) {
82 while ((n = bufend - (cptr = iop->_ptr)) <= 0) /* full buf */
83 if (_xflsbuf(iop) == EOF)
84 return (count - (nleft + size - 1)/size);
85 n = MIN(nleft, n);
86 (void) memcpy((char *) cptr, ptr, n);
87 iop->_cnt -= n;
88 iop->_ptr += n;
89 _BUFSYNC(iop);
90 /* done; flush if linebuffered with a newline */
91 if ((nleft -= n) == 0) {
92 if (iop->_flag & (_IOLBF | _IONBF)) {
93 if ((iop->_flag & _IONBF) || (memchr(prev_ptr,
94 '\n',iop->_ptr - prev_ptr) != NULL)) {
95 (void) _xflsbuf(iop);
96 }
97 }
98 return (count);
99 }
100 }
101 }
102