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 /* Copyright (c) 1984 AT&T */ 23 /* All Rights Reserved */ 24 25 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.8 */ 26 27 /*LINTLIBRARY*/ 28 #include <stdio.h> 29 #include <fcntl.h> 30 31 extern int open(), fclose(); 32 extern FILE *_findiop(), *_endopen(); 33 34 FILE * 35 fopen(file, mode) 36 char *file, *mode; 37 { 38 return (_endopen(file, mode, _findiop())); 39 } 40 41 FILE * 42 freopen(file, mode, iop) 43 char *file, *mode; 44 register FILE *iop; 45 { 46 (void) fclose(iop); /* doesn't matter if this fails */ 47 return (_endopen(file, mode, iop)); 48 } 49 50 static FILE * 51 _endopen(file, mode, iop) 52 char *file, *mode; 53 register FILE *iop; 54 { 55 register int plus, oflag, fd; 56 57 if (iop == NULL || file == NULL || file[0] == '\0') 58 return (NULL); 59 plus = (mode[1] == '+'); 60 switch (mode[0]) { 61 case 'w': 62 oflag = (plus ? O_RDWR : O_WRONLY) | O_TRUNC | O_CREAT; 63 break; 64 case 'a': 65 oflag = (plus ? O_RDWR : O_WRONLY) | O_APPEND | O_CREAT; 66 break; 67 case 'r': 68 oflag = plus ? O_RDWR : O_RDONLY; 69 break; 70 default: 71 return (NULL); 72 } 73 if ((fd = open(file, oflag, 0666)) < 0) 74 return (NULL); 75 iop->_cnt = 0; 76 iop->_file = fd; 77 iop->_flag = plus ? _IORW : (mode[0] == 'r') ? _IOREAD : _IOWRT; 78 if (mode[0] == 'a') { 79 if (!plus) { 80 /* if update only mode, move file pointer to the end 81 of the file */ 82 if ((lseek(fd,0L,2)) < 0) { 83 (void) close(fd); 84 return NULL; 85 } 86 } 87 } 88 iop->_base = iop->_ptr = NULL; 89 iop->_bufsiz = 0; 90 return (iop); 91 } 92