scoutos / prex-0.9.0 / usr / lib / libc / stdlib / getsubopt.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 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the University nor the names of its contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <unistd.h> |
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31 | #include <stdlib.h> |
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32 | #include <string.h> |
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33 | |||
34 | /*
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35 | * The SVID interface to getsubopt provides no way of figuring out which
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36 | * part of the suboptions list wasn't matched. This makes error messages
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37 | * tricky... The extern variable suboptarg is a pointer to the token
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38 | * which didn't match.
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39 | */
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40 | char *suboptarg;
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41 | |||
42 | int
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43 | getsubopt(optionp, tokens, valuep) |
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44 | char **optionp, **valuep;
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45 | char * const *tokens; |
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46 | { |
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47 | int cnt;
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48 | char *p;
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49 | |||
50 | suboptarg = *valuep = NULL;
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51 | |||
52 | if (!optionp || !*optionp)
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53 | return(-1); |
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54 | |||
55 | /* skip leading white-space, commas */
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56 | for (p = *optionp; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
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57 | |||
58 | if (!*p) {
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59 | *optionp = p; |
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60 | return(-1); |
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61 | } |
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62 | |||
63 | /* save the start of the token, and skip the rest of the token. */
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64 | for (suboptarg = p;
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65 | *++p && *p != ',' && *p != '=' && *p != ' ' && *p != '\t';); |
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66 | |||
67 | if (*p) {
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68 | /*
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69 | * If there's an equals sign, set the value pointer, and
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70 | * skip over the value part of the token. Terminate the
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71 | * token.
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72 | */
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73 | if (*p == '=') { |
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74 | *p = '\0';
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75 | for (*valuep = ++p;
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76 | *p && *p != ',' && *p != ' ' && *p != '\t'; ++p); |
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77 | if (*p)
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78 | *p++ = '\0';
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79 | } else
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80 | *p++ = '\0';
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81 | /* Skip any whitespace or commas after this token. */
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82 | for (; *p && (*p == ',' || *p == ' ' || *p == '\t'); ++p); |
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83 | } |
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84 | |||
85 | /* set optionp for next round. */
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86 | *optionp = p; |
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87 | |||
88 | for (cnt = 0; *tokens; ++tokens, ++cnt) |
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89 | if (!strcmp(suboptarg, *tokens))
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90 | return(cnt);
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91 | return(-1); |
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92 | } |