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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char rcsid[] = "$OpenBSD: stdio.c,v 1.8 2005/03/31 18:36:29 pat Exp $"; 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include <fcntl.h> 38 #include <unistd.h> 39 #include <stdio.h> 40 #include "local.h" 41 42 /* 43 * Small standard I/O/seek/close functions. 44 * These maintain the `known seek offset' for seek optimisation. 45 */ 46 int 47 __sread(void *cookie, char *buf, int n) 48 { 49 FILE *fp = cookie; 50 int ret; 51 52 ret = read(fp->_file, buf, n); 53 /* if the read succeeded, update the current offset */ 54 if (ret >= 0) 55 fp->_offset += ret; 56 else 57 fp->_flags &= ~__SOFF; /* paranoia */ 58 return (ret); 59 } 60 61 int 62 __swrite(void *cookie, const char *buf, int n) 63 { 64 FILE *fp = cookie; 65 66 if (fp->_flags & __SAPP) 67 (void) lseek(fp->_file, (off_t)0, SEEK_END); 68 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 69 return (write(fp->_file, buf, n)); 70 } 71 72 fpos_t 73 __sseek(void *cookie, fpos_t offset, int whence) 74 { 75 FILE *fp = cookie; 76 off_t ret; 77 78 ret = lseek(fp->_file, (off_t)offset, whence); 79 if (ret == (off_t)-1) 80 fp->_flags &= ~__SOFF; 81 else { 82 fp->_flags |= __SOFF; 83 fp->_offset = ret; 84 } 85 return (ret); 86 } 87 88 int 89 __sclose(void *cookie) 90 { 91 return (close(((FILE *)cookie)->_file)); 92 } 93