1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 static char sccsid[] = "@(#)flags.c 8.1 (Berkeley) 6/4/93"; 39 #endif /* LIBC_SCCS and not lint */ 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/types.h> 44 #include <sys/file.h> 45 #include <stdio.h> 46 #include <errno.h> 47 48 #include "local.h" 49 50 /* 51 * Return the (stdio) flags for a given mode. Store the flags 52 * to be passed to an _open() syscall through *optr. 53 * Return 0 on error. 54 */ 55 int 56 __sflags(mode, optr) 57 const char *mode; 58 int *optr; 59 { 60 int ret, m, o; 61 62 switch (*mode++) { 63 64 case 'r': /* open for reading */ 65 ret = __SRD; 66 m = O_RDONLY; 67 o = 0; 68 break; 69 70 case 'w': /* open for writing */ 71 ret = __SWR; 72 m = O_WRONLY; 73 o = O_CREAT | O_TRUNC; 74 break; 75 76 case 'a': /* open for appending */ 77 ret = __SWR; 78 m = O_WRONLY; 79 o = O_CREAT | O_APPEND; 80 break; 81 82 default: /* illegal mode */ 83 errno = EINVAL; 84 return (0); 85 } 86 87 /* [rwa]\+ or [rwa]b\+ means read and write */ 88 if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) { 89 ret = __SRW; 90 m = O_RDWR; 91 } 92 *optr = m | o; 93 return (ret); 94 } 95