2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)fvwrite.c 8.1 (Berkeley) 6/4/93";
39 #endif /* LIBC_SCCS and not lint */
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
50 * Write some memory regions. Return zero on success, EOF on error.
52 * This routine is large and unsightly, but most of the ugliness due
53 * to the three different kinds of output buffering is handled here.
67 if ((len = uio->uio_resid) == 0)
69 /* make sure we can write */
70 if (prepwrite(fp) != 0)
73 #define MIN(a, b) ((a) < (b) ? (a) : (b))
74 #define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n))
80 #define GETIOV(extra_work) \
87 if (fp->_flags & __SNBF) {
89 * Unbuffered: write up to BUFSIZ bytes at a time.
93 w = _swrite(fp, p, MIN(len, BUFSIZ));
98 } while ((uio->uio_resid -= w) != 0);
99 } else if ((fp->_flags & __SLBF) == 0) {
101 * Fully buffered: fill partially full buffer, if any,
102 * and then flush. If there is no partial buffer, write
103 * one _bf._size byte chunk directly (without copying).
105 * String output is a special case: write as many bytes
106 * as fit, but pretend we wrote everything. This makes
107 * snprintf() return the number of bytes needed, rather
108 * than the number used, and avoids its write function
109 * (so that the write function can be invalid).
113 if ((fp->_flags & (__SALC | __SSTR)) ==
114 (__SALC | __SSTR) && fp->_w < len) {
115 size_t blen = fp->_p - fp->_bf._base;
118 * Alloc an extra 128 bytes (+ 1 for NULL)
119 * so we don't call realloc(3) so often.
122 fp->_bf._size = blen + len + 128;
124 reallocf(fp->_bf._base, fp->_bf._size + 1);
125 if (fp->_bf._base == NULL)
127 fp->_p = fp->_bf._base + blen;
130 if (fp->_flags & __SSTR) {
134 COPY(w); /* copy MIN(fp->_w,len), */
138 w = len; /* but pretend copied all */
139 } else if (fp->_p > fp->_bf._base && len > w) {
142 /* fp->_w -= w; */ /* unneeded */
146 } else if (len >= (w = fp->_bf._size)) {
148 w = _swrite(fp, p, w);
160 } while ((uio->uio_resid -= w) != 0);
163 * Line buffered: like fully buffered, but we
164 * must check for newlines. Compute the distance
165 * to the first newline (including the newline),
166 * or `infinity' if there is none, then pretend
167 * that the amount to write is MIN(len,nldist).
170 nldist = 0; /* XXX just to keep gcc happy */
174 nl = memchr((void *)p, '\n', len);
175 nldist = nl ? nl + 1 - p : len + 1;
178 s = MIN(len, nldist);
179 w = fp->_w + fp->_bf._size;
180 if (fp->_p > fp->_bf._base && s > w) {
186 } else if (s >= (w = fp->_bf._size)) {
187 w = _swrite(fp, p, w);
196 if ((nldist -= w) == 0) {
197 /* copied the newline: flush and forget */
204 } while ((uio->uio_resid -= w) != 0);
209 fp->_flags |= __SERR;