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2 | pj | 1 | /*- |
2 | * Copyright (c) 1990, 1993 |
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3 | * The Regents of the University of California. All rights reserved. |
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4 | * |
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5 | * This code is derived from software contributed to Berkeley by |
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6 | * Chris Torek. |
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7 | * |
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8 | * Redistribution and use in source and binary forms, with or without |
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9 | * modification, are permitted provided that the following conditions |
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10 | * are met: |
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11 | * 1. Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * 3. All advertising materials mentioning features or use of this software |
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17 | * must display the following acknowledgement: |
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18 | * This product includes software developed by the University of |
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19 | * California, Berkeley and its contributors. |
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20 | * 4. Neither the name of the University nor the names of its contributors |
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21 | * may be used to endorse or promote products derived from this software |
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22 | * without specific prior written permission. |
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23 | * |
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24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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34 | * SUCH DAMAGE. |
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35 | */ |
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36 | |||
37 | #if defined(LIBC_SCCS) && !defined(lint) |
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38 | #if 0 |
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39 | static char sccsid[] = "@(#)flags.c 8.1 (Berkeley) 6/4/93"; |
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40 | #endif |
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41 | static const char rcsid[] = |
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42 | "$\Id: flags.c,v 1.3 1996/06/22 10:33:13 jraynard Exp $"; |
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43 | #endif /* LIBC_SCCS and not lint */ |
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44 | |||
45 | #include <sys/types.h> |
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46 | #include <sys/file.h> |
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47 | #include <stdio.h> |
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48 | #include <errno.h> |
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49 | #include "local.h" |
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50 | |||
51 | /* |
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52 | * Return the (stdio) flags for a given mode. Store the flags |
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53 | * to be passed to an open() syscall through *optr. |
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54 | * Return 0 on error. |
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55 | */ |
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56 | int |
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57 | __sflags(mode, optr) |
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58 | register const char *mode; |
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59 | int *optr; |
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60 | { |
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61 | register int ret, m, o; |
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62 | |||
63 | switch (*mode++) { |
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64 | |||
65 | case 'r': /* open for reading */ |
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66 | ret = __SRD; |
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67 | m = O_RDONLY; |
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68 | o = 0; |
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69 | break; |
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70 | |||
71 | case 'w': /* open for writing */ |
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72 | ret = __SWR; |
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73 | m = O_WRONLY; |
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74 | o = O_CREAT | O_TRUNC; |
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75 | break; |
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76 | |||
77 | case 'a': /* open for appending */ |
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78 | ret = __SWR; |
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79 | m = O_WRONLY; |
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80 | o = O_CREAT | O_APPEND; |
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81 | break; |
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82 | |||
83 | default: /* illegal mode */ |
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84 | errno = EINVAL; |
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85 | return (0); |
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86 | } |
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87 | |||
88 | /* [rwa]\+ or [rwa]b\+ means read and write */ |
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89 | if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) { |
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90 | ret = __SRW; |
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91 | m = O_RDWR; |
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92 | } |
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93 | *optr = m | o; |
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94 | return (ret); |
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95 | } |