1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * 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 /*static char *sccsid = "from: @(#)stdio.c 5.3 (Berkeley) 2/24/91";*/ 39 static char *rcsid = "$Id: stdio.c,v 1.3 1993/08/26 00:47:27 jtc Exp $"; 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include <fcntl.h> 43 #include <unistd.h> 44 #include <stdio.h> 45 #include "local.h" 46 47 /* 48 * Small standard I/O/seek/close functions. 49 * These maintain the `known seek offset' for seek optimisation. 50 */ 51 __sread(cookie, buf, n) 52 void *cookie; 53 char *buf; 54 int n; 55 { 56 register FILE *fp = cookie; 57 register int ret; 58 59 ret = read(fp->_file, buf, n); 60 /* if the read succeeded, update the current offset */ 61 if (ret >= 0) 62 fp->_offset += ret; 63 else 64 fp->_flags &= ~__SOFF; /* paranoia */ 65 return (ret); 66 } 67 68 __swrite(cookie, buf, n) 69 void *cookie; 70 char const *buf; 71 int n; 72 { 73 register FILE *fp = cookie; 74 75 if (fp->_flags & __SAPP) 76 (void) lseek(fp->_file, (off_t)0, SEEK_END); 77 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 78 return (write(fp->_file, buf, n)); 79 } 80 81 fpos_t 82 __sseek(cookie, offset, whence) 83 void *cookie; 84 fpos_t offset; 85 int whence; 86 { 87 register FILE *fp = cookie; 88 register off_t ret; 89 90 ret = lseek(fp->_file, (off_t)offset, whence); 91 if (ret == -1L) 92 fp->_flags &= ~__SOFF; 93 else { 94 fp->_flags |= __SOFF; 95 fp->_offset = ret; 96 } 97 return (ret); 98 } 99 100 __sclose(cookie) 101 void *cookie; 102 { 103 104 return (close(((FILE *)cookie)->_file)); 105 } 106