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