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 1.5 2003/06/02 20:18:37 millert 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(cookie, buf, n) 48 void *cookie; 49 char *buf; 50 int n; 51 { 52 register FILE *fp = cookie; 53 register int ret; 54 55 ret = read(fp->_file, buf, n); 56 /* if the read succeeded, update the current offset */ 57 if (ret >= 0) 58 fp->_offset += ret; 59 else 60 fp->_flags &= ~__SOFF; /* paranoia */ 61 return (ret); 62 } 63 64 int 65 __swrite(cookie, buf, n) 66 void *cookie; 67 char const *buf; 68 int n; 69 { 70 register FILE *fp = cookie; 71 72 if (fp->_flags & __SAPP) 73 (void) lseek(fp->_file, (off_t)0, SEEK_END); 74 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 75 return (write(fp->_file, buf, n)); 76 } 77 78 fpos_t 79 __sseek(cookie, offset, whence) 80 void *cookie; 81 fpos_t offset; 82 int whence; 83 { 84 register FILE *fp = cookie; 85 register off_t ret; 86 87 ret = lseek(fp->_file, (off_t)offset, whence); 88 if (ret == (off_t)-1) 89 fp->_flags &= ~__SOFF; 90 else { 91 fp->_flags |= __SOFF; 92 fp->_offset = ret; 93 } 94 return (ret); 95 } 96 97 int 98 __sclose(cookie) 99 void *cookie; 100 { 101 102 return (close(((FILE *)cookie)->_file)); 103 } 104