1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 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. 23 * 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 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <fcntl.h> 47 #include <unistd.h> 48 #include <stdio.h> 49 #include "un-namespace.h" 50 #include "local.h" 51 52 /* 53 * Small standard I/O/seek/close functions. 54 * These maintain the `known seek offset' for seek optimisation. 55 */ 56 int 57 __sread(cookie, buf, n) 58 void *cookie; 59 char *buf; 60 int n; 61 { 62 register FILE *fp = cookie; 63 register int ret; 64 65 ret = _read(fp->_file, buf, (size_t)n); 66 /* if the read succeeded, update the current offset */ 67 if (ret >= 0) 68 fp->_offset += ret; 69 else 70 fp->_flags &= ~__SOFF; /* paranoia */ 71 return (ret); 72 } 73 74 int 75 __swrite(cookie, buf, n) 76 void *cookie; 77 char const *buf; 78 int n; 79 { 80 register FILE *fp = cookie; 81 82 if (fp->_flags & __SAPP) 83 (void) lseek(fp->_file, (off_t)0, SEEK_END); 84 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 85 return (_write(fp->_file, buf, (size_t)n)); 86 } 87 88 fpos_t 89 __sseek(cookie, offset, whence) 90 void *cookie; 91 fpos_t offset; 92 int whence; 93 { 94 register FILE *fp = cookie; 95 register off_t ret; 96 97 ret = lseek(fp->_file, (off_t)offset, whence); 98 if (ret == -1) 99 fp->_flags &= ~__SOFF; 100 else { 101 fp->_flags |= __SOFF; 102 fp->_offset = ret; 103 } 104 return (ret); 105 } 106 107 int 108 __sclose(cookie) 109 void *cookie; 110 { 111 112 return (_close(((FILE *)cookie)->_file)); 113 } 114