1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1986 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /*LINTLIBRARY*/ 33 #include <stdio.h> 34 #include <fcntl.h> 35 36 extern int fclose(); 37 extern FILE *_findiop(); 38 39 static FILE *_endopen(char *, char *, FILE *); 40 41 FILE * 42 fopen(char *file, char *mode) 43 { 44 return (_endopen(file, mode, _findiop())); 45 } 46 47 FILE * 48 freopen(char *file, char *mode, FILE *iop) 49 { 50 (void) fclose(iop); /* doesn't matter if this fails */ 51 return (_endopen(file, mode, iop)); 52 } 53 54 static FILE * 55 _endopen(char *file, char *mode, FILE *iop) 56 { 57 int plus, oflag, fd; 58 59 if (iop == NULL || file == NULL || file[0] == '\0') 60 return (NULL); 61 plus = (mode[1] == '+'); 62 switch (mode[0]) { 63 case 'w': 64 oflag = (plus ? O_RDWR : O_WRONLY) | O_TRUNC | O_CREAT; 65 break; 66 case 'a': 67 oflag = (plus ? O_RDWR : O_WRONLY) | O_CREAT; 68 break; 69 case 'r': 70 oflag = plus ? O_RDWR : O_RDONLY; 71 break; 72 default: 73 return (NULL); 74 } 75 if ((fd = open(file, oflag, 0666)) < 0) 76 return (NULL); 77 iop->_cnt = 0; 78 iop->_file = fd; 79 iop->_flag = plus ? _IORW : (mode[0] == 'r') ? _IOREAD : _IOWRT; 80 if (mode[0] == 'a') { 81 if ((lseek(fd,0L,2)) < 0) { 82 (void) close(fd); 83 return NULL; 84 } 85 } 86 iop->_base = iop->_ptr = NULL; 87 iop->_bufsiz = 0; 88 return (iop); 89 } 90