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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 /* Copyright (c) 2013 OmniTI Computer Consulting, Inc. All rights reserved. */ 31 /* 32 * Copyright 2020 Robert Mustacchi 33 */ 34 35 /* 36 * Commonized processing of the 'mode' string for stdio. 37 */ 38 39 #include "mtlib.h" 40 #include "file64.h" 41 #include <stdio.h> 42 #include <errno.h> 43 #include <sys/types.h> 44 #include <fcntl.h> 45 46 int 47 _stdio_flags(const char *type, int *oflagsp, int *fflagsp) 48 { 49 int oflag, fflag, plusflag, eflag, xflag; 50 const char *echr; 51 52 oflag = fflag = 0; 53 switch (type[0]) { 54 default: 55 errno = EINVAL; 56 return (-1); 57 case 'r': 58 oflag = O_RDONLY; 59 fflag = _IOREAD; 60 break; 61 case 'w': 62 oflag = O_WRONLY | O_TRUNC | O_CREAT; 63 fflag = _IOWRT; 64 break; 65 case 'a': 66 oflag = O_WRONLY | O_APPEND | O_CREAT; 67 fflag = _IOWRT; 68 break; 69 } 70 71 plusflag = 0; 72 eflag = 0; 73 xflag = 0; 74 for (echr = type + 1; *echr != '\0'; echr++) { 75 switch (*echr) { 76 /* UNIX ignores 'b' and treats text and binary the same */ 77 default: 78 break; 79 case '+': 80 plusflag = 1; 81 break; 82 case 'e': 83 eflag = 1; 84 break; 85 case 'x': 86 xflag = 1; 87 break; 88 } 89 } 90 91 if (eflag) { 92 /* Subsequent to a mode flag, 'e' indicates O_CLOEXEC */ 93 oflag = oflag | O_CLOEXEC; 94 } 95 96 if (plusflag) { 97 oflag = (oflag & ~(O_RDONLY | O_WRONLY)) | O_RDWR; 98 fflag = _IORW; 99 } 100 101 if (xflag) { 102 oflag |= O_EXCL; 103 } 104 105 *oflagsp = oflag; 106 *fflagsp = fflag; 107 108 return (0); 109 } 110