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Annotation of prex-old/usr/lib/libc/stdio/flags.c, Revision 1.1.1.1

1.1       nbrk        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. Neither the name of the University nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  */
                     32:
                     33: #include <sys/types.h>
                     34: #include <sys/fcntl.h>
                     35: #include <stdio.h>
                     36: #include <errno.h>
                     37:
                     38: /*
                     39:  * Return the (stdio) flags for a given mode.  Store the flags
                     40:  * to be passed to an open() syscall through *optr.
                     41:  * Return 0 on error.
                     42:  */
                     43: int
                     44: __sflags(char *mode, int *optr)
                     45: {
                     46:        int ret, m, o;
                     47:
                     48:        switch (*mode++) {
                     49:
                     50:        case 'r':       /* open for reading */
                     51:                ret = __SRD;
                     52:                m = O_RDONLY;
                     53:                o = 0;
                     54:                break;
                     55:
                     56:        case 'w':       /* open for writing */
                     57:                ret = __SWR;
                     58:                m = O_WRONLY;
                     59:                o = O_CREAT | O_TRUNC;
                     60:                break;
                     61:
                     62:        case 'a':       /* open for appending */
                     63:                ret = __SWR;
                     64:                m = O_WRONLY;
                     65:                o = O_CREAT | O_APPEND;
                     66:                break;
                     67:
                     68:        default:        /* illegal mode */
                     69:                errno = EINVAL;
                     70:                return (0);
                     71:        }
                     72:
                     73:        /* [rwa]\+ or [rwa]b\+ means read and write */
                     74:        if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) {
                     75:                ret = __SRW;
                     76:                m = O_RDWR;
                     77:        }
                     78:        *optr = m | o;
                     79:        return (ret);
                     80: }