| | 1 | /* |
| | 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * The contents of this file constitute Original Code as defined in and |
| | 7 | * are subject to the Apple Public Source License Version 1.1 (the |
| | 8 | * "License"). You may not use this file except in compliance with the |
| | 9 | * License. Please obtain a copy of the License at |
| | 10 | * http://www.apple.com/publicsource and read it before using this file. |
| | 11 | * |
| | 12 | * This Original Code and all software distributed under the License are |
| | 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| | 17 | * License for the specific language governing rights and limitations |
| | 18 | * under the License. |
| | 19 | * |
| | 20 | * @APPLE_LICENSE_HEADER_END@ |
| | 21 | */ |
| | 22 | /* |
| | 23 | * Copyright (c) 1990, 1993 |
| | 24 | * The Regents of the University of California. All rights reserved. |
| | 25 | * |
| | 26 | * This code is derived from software contributed to Berkeley by |
| | 27 | * Chris Torek. |
| | 28 | * |
| | 29 | * Redistribution and use in source and binary forms, with or without |
| | 30 | * modification, are permitted provided that the following conditions |
| | 31 | * are met: |
| | 32 | * 1. Redistributions of source code must retain the above copyright |
| | 33 | * notice, this list of conditions and the following disclaimer. |
| | 34 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 35 | * notice, this list of conditions and the following disclaimer in the |
| | 36 | * documentation and/or other materials provided with the distribution. |
| | 37 | * 3. All advertising materials mentioning features or use of this software |
| | 38 | * must display the following acknowledgement: |
| | 39 | * This product includes software developed by the University of |
| | 40 | * California, Berkeley and its contributors. |
| | 41 | * 4. Neither the name of the University nor the names of its contributors |
| | 42 | * may be used to endorse or promote products derived from this software |
| | 43 | * without specific prior written permission. |
| | 44 | * |
| | 45 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 55 | * SUCH DAMAGE. |
| | 56 | */ |
| | 57 | |
| | 58 | |
| | 59 | #include <stdio.h> |
| | 60 | #include "local.h" |
| | 61 | |
| | 62 | /* |
| | 63 | * Write the given character into the (probably full) buffer for |
| | 64 | * the given file. Flush the buffer out if it is or becomes full, |
| | 65 | * or if c=='\n' and the file is line buffered. |
| | 66 | */ |
| | 67 | int |
| | 68 | __swbuf(c, fp) |
| | 69 | register int c; |
| | 70 | register FILE *fp; |
| | 71 | { |
| | 72 | register int n; |
| | 73 | |
| | 74 | /* |
| | 75 | * In case we cannot write, or longjmp takes us out early, |
| | 76 | * make sure _w is 0 (if fully- or un-buffered) or -_bf._size |
| | 77 | * (if line buffered) so that we will get called again. |
| | 78 | * If we did not do this, a sufficient number of putc() |
| | 79 | * calls might wrap _w from negative to positive. |
| | 80 | */ |
| | 81 | fp->_w = fp->_lbfsize; |
| | 82 | if (cantwrite(fp)) |
| | 83 | return (EOF); |
| | 84 | c = (unsigned char)c; |
| | 85 | |
| | 86 | /* |
| | 87 | * If it is completely full, flush it out. Then, in any case, |
| | 88 | * stuff c into the buffer. If this causes the buffer to fill |
| | 89 | * completely, or if c is '\n' and the file is line buffered, |
| | 90 | * flush it (perhaps a second time). The second flush will always |
| | 91 | * happen on unbuffered streams, where _bf._size==1; fflush() |
| | 92 | * guarantees that putc() will always call wbuf() by setting _w |
| | 93 | * to 0, so we need not do anything else. |
| | 94 | */ |
| | 95 | n = fp->_p - fp->_bf._base; |
| | 96 | if (n >= fp->_bf._size) { |
| | 97 | if (fflush(fp)) |
| | 98 | return (EOF); |
| | 99 | n = 0; |
| | 100 | } |
| | 101 | fp->_w--; |
| | 102 | *fp->_p++ = c; |
| | 103 | if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n')) |
| | 104 | if (fflush(fp)) |
| | 105 | return (EOF); |
| | 106 | return (c); |
| | 107 | } |
projects / apple / libc.git / blame_incremental