1 /* $NetBSD: stdio.c,v 1.5 1996/03/29 23:29:25 jtc 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 #if defined(LIBC_SCCS) && !defined(lint) 40 #if 0 41 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 42 #endif 43 static char rcsid[] = "$NetBSD: stdio.c,v 1.5 1996/03/29 23:29:25 jtc Exp $"; 44 #endif /* LIBC_SCCS and not lint */ 45 46 #include <fcntl.h> 47 #include <unistd.h> 48 #include <stdio.h> 49 #include "local.h" 50 51 /* 52 * Small standard I/O/seek/close functions. 53 * These maintain the `known seek offset' for seek optimisation. 54 */ 55 int 56 __sread(cookie, buf, n) 57 void *cookie; 58 char *buf; 59 int n; 60 { 61 register FILE *fp = cookie; 62 register int ret; 63 64 ret = read(fp->_file, buf, n); 65 /* if the read succeeded, update the current offset */ 66 if (ret >= 0) 67 fp->_offset += ret; 68 else 69 fp->_flags &= ~__SOFF; /* paranoia */ 70 return (ret); 71 } 72 73 int 74 __swrite(cookie, buf, n) 75 void *cookie; 76 char const *buf; 77 int n; 78 { 79 register FILE *fp = cookie; 80 81 if (fp->_flags & __SAPP) 82 (void) lseek(fp->_file, (off_t)0, SEEK_END); 83 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 84 return (write(fp->_file, buf, n)); 85 } 86 87 fpos_t 88 __sseek(cookie, offset, whence) 89 void *cookie; 90 fpos_t offset; 91 int whence; 92 { 93 register FILE *fp = cookie; 94 register off_t ret; 95 96 ret = lseek(fp->_file, (off_t)offset, whence); 97 if (ret == -1L) 98 fp->_flags &= ~__SOFF; 99 else { 100 fp->_flags |= __SOFF; 101 fp->_offset = ret; 102 } 103 return (ret); 104 } 105 106 int 107 __sclose(cookie) 108 void *cookie; 109 { 110 111 return (close(((FILE *)cookie)->_file)); 112 } 113