1 /* $NetBSD: stdio.c,v 1.11 1999/09/20 04:39:33 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 __RCSID("$NetBSD: stdio.c,v 1.11 1999/09/20 04:39:33 lukem Exp $"); 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 #include "namespace.h" 49 50 #include <assert.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <stdio.h> 54 #include <unistd.h> 55 56 #include "local.h" 57 58 /* 59 * Small standard I/O/seek/close functions. 60 * These maintain the `known seek offset' for seek optimisation. 61 */ 62 int 63 __sread(cookie, buf, n) 64 void *cookie; 65 char *buf; 66 int n; 67 { 68 FILE *fp = cookie; 69 int ret; 70 71 _DIAGASSERT(fp != NULL); 72 _DIAGASSERT(buf != NULL); 73 74 ret = read(fp->_file, buf, (size_t)n); 75 /* if the read succeeded, update the current offset */ 76 if (ret >= 0) 77 fp->_offset += ret; 78 else 79 fp->_flags &= ~__SOFF; /* paranoia */ 80 return (ret); 81 } 82 83 int 84 __swrite(cookie, buf, n) 85 void *cookie; 86 char const *buf; 87 int n; 88 { 89 FILE *fp = cookie; 90 91 _DIAGASSERT(cookie != NULL); 92 _DIAGASSERT(buf != NULL); 93 94 if (fp->_flags & __SAPP) 95 (void) lseek(fp->_file, (off_t)0, SEEK_END); 96 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 97 return (write(fp->_file, buf, (size_t)n)); 98 } 99 100 fpos_t 101 __sseek(cookie, offset, whence) 102 void *cookie; 103 fpos_t offset; 104 int whence; 105 { 106 FILE *fp = cookie; 107 off_t ret; 108 109 _DIAGASSERT(fp != NULL); 110 111 ret = lseek(fp->_file, (off_t)offset, whence); 112 if (ret == -1L) 113 fp->_flags &= ~__SOFF; 114 else { 115 fp->_flags |= __SOFF; 116 fp->_offset = ret; 117 } 118 return (ret); 119 } 120 121 int 122 __sclose(cookie) 123 void *cookie; 124 { 125 126 _DIAGASSERT(cookie != NULL); 127 128 return (close(((FILE *)cookie)->_file)); 129 } 130