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. 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 #if 0 39 static char sccsid[] = "@(#)stdio.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$Id$"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <fcntl.h> 46 #include <unistd.h> 47 #include <stdio.h> 48 #include "local.h" 49 50 /* 51 * Small standard I/O/seek/close functions. 52 * These maintain the `known seek offset' for seek optimisation. 53 */ 54 int 55 __sread(cookie, buf, n) 56 void *cookie; 57 char *buf; 58 int n; 59 { 60 register FILE *fp = cookie; 61 register int ret; 62 63 ret = read(fp->_file, buf, (size_t)n); 64 /* if the read succeeded, update the current offset */ 65 if (ret >= 0) 66 fp->_offset += ret; 67 else 68 fp->_flags &= ~__SOFF; /* paranoia */ 69 return (ret); 70 } 71 72 int 73 __swrite(cookie, buf, n) 74 void *cookie; 75 char const *buf; 76 int n; 77 { 78 register FILE *fp = cookie; 79 80 if (fp->_flags & __SAPP) 81 (void) lseek(fp->_file, (off_t)0, SEEK_END); 82 fp->_flags &= ~__SOFF; /* in case FAPPEND mode is set */ 83 return (write(fp->_file, buf, (size_t)n)); 84 } 85 86 fpos_t 87 __sseek(cookie, offset, whence) 88 void *cookie; 89 fpos_t offset; 90 int whence; 91 { 92 register FILE *fp = cookie; 93 register off_t ret; 94 95 ret = lseek(fp->_file, (off_t)offset, whence); 96 if (ret == -1) 97 fp->_flags &= ~__SOFF; 98 else { 99 fp->_flags |= __SOFF; 100 fp->_offset = ret; 101 } 102 return (ret); 103 } 104 105 int 106 __sclose(cookie) 107 void *cookie; 108 { 109 110 return (close(((FILE *)cookie)->_file)); 111 } 112