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
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9 * modification, are permitted provided that the following conditions
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12 * notice, this list of conditions and the following disclaimer.
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16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
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20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)fvwrite.c 8.1 (Berkeley) 6/4/93";
35 #endif /* LIBC_SCCS and not lint */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
46 * Write some memory regions. Return zero on success, EOF on error.
48 * This routine is large and unsightly, but most of the ugliness due
49 * to the three different kinds of output buffering is handled here.
52 __sfvwrite(FILE *fp, struct __suio *uio)
61 if (uio->uio_resid == 0)
63 /* make sure we can write */
64 if (prepwrite(fp) != 0)
67 #define MIN(a, b) ((a) < (b) ? (a) : (b))
68 #define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n))
74 #define GETIOV(extra_work) \
81 if (fp->_flags & __SNBF) {
83 * Unbuffered: write up to BUFSIZ bytes at a time.
87 w = _swrite(fp, p, MIN(len, BUFSIZ));
92 } while ((uio->uio_resid -= w) != 0);
93 } else if ((fp->_flags & __SLBF) == 0) {
95 * Fully buffered: fill partially full buffer, if any,
96 * and then flush. If there is no partial buffer, write
97 * one _bf._size byte chunk directly (without copying).
99 * String output is a special case: write as many bytes
100 * as fit, but pretend we wrote everything. This makes
101 * snprintf() return the number of bytes needed, rather
102 * than the number used, and avoids its write function
103 * (so that the write function can be invalid).
107 if ((fp->_flags & (__SALC | __SSTR)) ==
108 (__SALC | __SSTR) && fp->_w < len) {
109 size_t blen = fp->_p - fp->_bf._base;
112 * Alloc an extra 128 bytes (+ 1 for NULL)
113 * so we don't call realloc(3) so often.
116 fp->_bf._size = blen + len + 128;
118 reallocf(fp->_bf._base, fp->_bf._size + 1);
119 if (fp->_bf._base == NULL)
121 fp->_p = fp->_bf._base + blen;
124 if (fp->_flags & __SSTR) {
128 COPY(w); /* copy MIN(fp->_w,len), */
132 w = len; /* but pretend copied all */
133 } else if (fp->_p > fp->_bf._base && len > w) {
136 /* fp->_w -= w; */ /* unneeded */
140 } else if (len >= (w = fp->_bf._size)) {
142 w = _swrite(fp, p, w);
154 } while ((uio->uio_resid -= w) != 0);
157 * Line buffered: like fully buffered, but we
158 * must check for newlines. Compute the distance
159 * to the first newline (including the newline),
160 * or `infinity' if there is none, then pretend
161 * that the amount to write is MIN(len,nldist).
164 nldist = 0; /* XXX just to keep gcc happy */
168 nl = memchr((void *)p, '\n', len);
169 nldist = nl ? nl + 1 - p : len + 1;
172 s = MIN(len, nldist);
173 w = fp->_w + fp->_bf._size;
174 if (fp->_p > fp->_bf._base && s > w) {
180 } else if (s >= (w = fp->_bf._size)) {
181 w = _swrite(fp, p, w);
190 if ((nldist -= w) == 0) {
191 /* copied the newline: flush and forget */
198 } while ((uio->uio_resid -= w) != 0);
203 fp->_flags |= __SERR;