2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
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35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] = "@(#)wbuf.c 8.1 (Berkeley) 6/4/93";
37 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
46 * Write the given character into the (probably full) buffer for
47 * the given file. Flush the buffer out if it is or becomes full,
48 * or if c=='\n' and the file is line buffered.
53 __swbuf(int c, FILE *fp)
58 * In case we cannot write, or longjmp takes us out early,
59 * make sure _w is 0 (if fully- or un-buffered) or -_bf._size
60 * (if line buffered) so that we will get called again.
61 * If we did not do this, a sufficient number of putc()
62 * calls might wrap _w from negative to positive.
64 fp->_w = fp->_lbfsize;
65 if (prepwrite(fp) != 0) {
74 * If it is completely full, flush it out. Then, in any case,
75 * stuff c into the buffer. If this causes the buffer to fill
76 * completely, or if c is '\n' and the file is line buffered,
77 * flush it (perhaps a second time). The second flush will always
78 * happen on unbuffered streams, where _bf._size==1; fflush()
79 * guarantees that putc() will always call wbuf() by setting _w
80 * to 0, so we need not do anything else.
82 n = fp->_p - fp->_bf._base;
83 if (n >= fp->_bf._size) {
90 if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n'))