flags.c - vx32 - Local 9vx git repository for patches.
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       ---
       flags.c (2959B)
       ---
            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 rcsid[] = "$OpenBSD: flags.c,v 1.3 1996/08/19 08:32:37 tholo Exp $";
           39 #endif /* LIBC_SCCS and not lint */
           40 
           41 #include <sys/types.h>
           42 #include <sys/file.h>
           43 #include <stdio.h>
           44 #include <fcntl.h>
           45 #include <errno.h>
           46 
           47 /*
           48  * Return the (stdio) flags for a given mode.  Store the flags
           49  * to be passed to an open() syscall through *optr.
           50  * Return 0 on error.
           51  */
           52 int
           53 __sflags(mode, optr)
           54         register const char *mode;
           55         int *optr;
           56 {
           57         register int ret, m, o;
           58 
           59         switch (*mode++) {
           60 
           61         case 'r':        /* open for reading */
           62                 ret = __SRD;
           63                 m = O_RDONLY;
           64                 o = 0;
           65                 break;
           66 
           67         case 'w':        /* open for writing */
           68                 ret = __SWR;
           69                 m = O_WRONLY;
           70                 o = O_CREAT | O_TRUNC;
           71                 break;
           72 
           73         case 'a':        /* open for appending */
           74                 ret = __SWR;
           75                 m = O_WRONLY;
           76                 o = O_CREAT | O_APPEND;
           77                 break;
           78 
           79         default:        /* illegal mode */
           80                 errno = EINVAL;
           81                 return (0);
           82         }
           83 
           84         /* [rwa]\+ or [rwa]b\+ means read and write */
           85         if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
           86                 ret = __SRW;
           87                 m = O_RDWR;
           88         }
           89         *optr = m | o;
           90         return (ret);
           91 }