11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 161573Srgrimes * 4. Neither the name of the University nor the names of its contributors 171573Srgrimes * may be used to endorse or promote products derived from this software 181573Srgrimes * without specific prior written permission. 191573Srgrimes * 201573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301573Srgrimes * SUCH DAMAGE. 311573Srgrimes */ 321573Srgrimes 331573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 341573Srgrimesstatic char sccsid[] = "@(#)flags.c 8.1 (Berkeley) 6/4/93"; 351573Srgrimes#endif /* LIBC_SCCS and not lint */ 3692986Sobrien#include <sys/cdefs.h> 3792986Sobrien__FBSDID("$FreeBSD$"); 381573Srgrimes 391573Srgrimes#include <sys/types.h> 401573Srgrimes#include <sys/file.h> 411573Srgrimes#include <stdio.h> 421573Srgrimes#include <errno.h> 4371579Sdeischen 4416586Sjraynard#include "local.h" 451573Srgrimes 461573Srgrimes/* 471573Srgrimes * Return the (stdio) flags for a given mode. Store the flags 4871579Sdeischen * to be passed to an _open() syscall through *optr. 491573Srgrimes * Return 0 on error. 501573Srgrimes */ 5116586Sjraynardint 5216586Sjraynard__sflags(mode, optr) 5392889Sobrien const char *mode; 541573Srgrimes int *optr; 551573Srgrimes{ 56257229Sjilles int ret, m, o, known; 571573Srgrimes 581573Srgrimes switch (*mode++) { 591573Srgrimes 601573Srgrimes case 'r': /* open for reading */ 611573Srgrimes ret = __SRD; 621573Srgrimes m = O_RDONLY; 631573Srgrimes o = 0; 641573Srgrimes break; 651573Srgrimes 661573Srgrimes case 'w': /* open for writing */ 671573Srgrimes ret = __SWR; 681573Srgrimes m = O_WRONLY; 691573Srgrimes o = O_CREAT | O_TRUNC; 701573Srgrimes break; 711573Srgrimes 721573Srgrimes case 'a': /* open for appending */ 731573Srgrimes ret = __SWR; 741573Srgrimes m = O_WRONLY; 751573Srgrimes o = O_CREAT | O_APPEND; 761573Srgrimes break; 771573Srgrimes 781573Srgrimes default: /* illegal mode */ 791573Srgrimes errno = EINVAL; 801573Srgrimes return (0); 811573Srgrimes } 821573Srgrimes 83257229Sjilles do { 84257229Sjilles known = 1; 85257229Sjilles switch (*mode++) { 86257229Sjilles case 'b': 87257229Sjilles /* 'b' (binary) is ignored */ 88257229Sjilles break; 89257229Sjilles case '+': 90257229Sjilles /* [rwa][b]\+ means read and write */ 91257229Sjilles ret = __SRW; 92257229Sjilles m = O_RDWR; 93257229Sjilles break; 94257229Sjilles case 'x': 95257229Sjilles /* 'x' means exclusive (fail if the file exists) */ 96257229Sjilles o |= O_EXCL; 97257229Sjilles break; 98257229Sjilles case 'e': 99257229Sjilles /* set close-on-exec */ 100257229Sjilles o |= O_CLOEXEC; 101257229Sjilles break; 102257229Sjilles default: 103257229Sjilles known = 0; 104257229Sjilles break; 105257229Sjilles } 106257229Sjilles } while (known); 107229845Sdas 108257229Sjilles if ((o & O_EXCL) != 0 && m == O_RDONLY) { 109257229Sjilles errno = EINVAL; 110257229Sjilles return (0); 1111573Srgrimes } 112229845Sdas 1131573Srgrimes *optr = m | o; 1141573Srgrimes return (ret); 1151573Srgrimes} 116