root / prex-0.9.0 / usr / lib / libc / stdio / flags.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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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. Neither the name of the University nor the names of its contributors
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17 | * may be used to endorse or promote products derived from this software
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18 | * without specific prior written permission.
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19 | *
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20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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30 | * SUCH DAMAGE.
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31 | */
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32 | |||
33 | #include <sys/types.h> |
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34 | #include <sys/fcntl.h> |
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35 | #include <stdio.h> |
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36 | #include <errno.h> |
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37 | |||
38 | /*
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39 | * Return the (stdio) flags for a given mode. Store the flags
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40 | * to be passed to an open() syscall through *optr.
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41 | * Return 0 on error.
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42 | */
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43 | int
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44 | __sflags(char *mode, int *optr) |
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45 | { |
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46 | int ret, m, o;
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47 | |||
48 | switch (*mode++) {
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49 | |||
50 | case 'r': /* open for reading */ |
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51 | ret = __SRD; |
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52 | m = O_RDONLY; |
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53 | o = 0;
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54 | break;
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55 | |||
56 | case 'w': /* open for writing */ |
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57 | ret = __SWR; |
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58 | m = O_WRONLY; |
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59 | o = O_CREAT | O_TRUNC; |
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60 | break;
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61 | |||
62 | case 'a': /* open for appending */ |
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63 | ret = __SWR; |
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64 | m = O_WRONLY; |
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65 | o = O_CREAT | O_APPEND; |
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66 | break;
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67 | |||
68 | default: /* illegal mode */ |
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69 | errno = EINVAL; |
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70 | return (0); |
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71 | } |
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72 | |||
73 | /* [rwa]\+ or [rwa]b\+ means read and write */
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74 | if (*mode == '+' || (*mode == 'b' && mode[1] == '+')) { |
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75 | ret = __SRW; |
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76 | m = O_RDWR; |
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77 | } |
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78 | *optr = m | o; |
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79 | return (ret);
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80 | } |