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: }
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