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1 /* $Id: getopt.c,v 1.2 2005/07/07 16:34:06 dron Exp $ */ |
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2 |
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3 /* |
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4 * Copyright (c) 1987, 1993, 1994 |
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5 * The Regents of the University of California. All rights reserved. |
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6 * |
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7 * Redistribution and use in source and binary forms, with or without |
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8 * modification, are permitted provided that the following conditions |
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9 * are met: |
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10 * 1. Redistributions of source code must retain the above copyright |
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11 * notice, this list of conditions and the following disclaimer. |
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12 * 2. Redistributions in binary form must reproduce the above copyright |
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13 * notice, this list of conditions and the following disclaimer in the |
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14 * documentation and/or other materials provided with the distribution. |
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15 * 3. Neither the name of the University nor the names of its contributors |
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16 * may be used to endorse or promote products derived from this software |
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17 * without specific prior written permission. |
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18 * |
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19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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29 * SUCH DAMAGE. |
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30 */ |
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31 |
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32 #if 0 |
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33 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95"; |
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34 __RCSID("$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $"); |
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35 #endif |
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36 |
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37 #include <stdio.h> |
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38 #include <string.h> |
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39 |
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40 int opterr = 1, /* if error message should be printed */ |
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41 optind = 1, /* index into parent argv vector */ |
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42 optopt, /* character checked for validity */ |
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43 optreset; /* reset getopt */ |
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44 char *optarg; /* argument associated with option */ |
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45 |
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46 #define BADCH (int)'?' |
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47 #define BADARG (int)':' |
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48 #define EMSG "" |
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49 |
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50 /* |
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51 * getopt -- |
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52 * Parse argc/argv argument vector. |
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53 */ |
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54 int |
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55 getopt(int argc, char * const argv[], const char *optstring) |
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56 { |
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57 static char *place = EMSG; /* option letter processing */ |
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58 char *oli; /* option letter list index */ |
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59 |
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60 if (optreset || *place == 0) { /* update scanning pointer */ |
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61 optreset = 0; |
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62 place = argv[optind]; |
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63 if (optind >= argc || *place++ != '-') { |
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64 /* Argument is absent or is not an option */ |
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65 place = EMSG; |
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66 return (-1); |
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67 } |
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68 optopt = *place++; |
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69 if (optopt == '-' && *place == 0) { |
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70 /* "--" => end of options */ |
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71 ++optind; |
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72 place = EMSG; |
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73 return (-1); |
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74 } |
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75 if (optopt == 0) { |
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76 /* Solitary '-', treat as a '-' option |
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77 if the program (eg su) is looking for it. */ |
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78 place = EMSG; |
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79 if (strchr(optstring, '-') == NULL) |
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80 return -1; |
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81 optopt = '-'; |
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82 } |
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83 } else |
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84 optopt = *place++; |
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85 |
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86 /* See if option letter is one the caller wanted... */ |
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87 if (optopt == ':' || (oli = strchr(optstring, optopt)) == NULL) { |
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88 if (*place == 0) |
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89 ++optind; |
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90 if (opterr && *optstring != ':') |
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91 (void)fprintf(stderr, |
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92 "unknown option -- %c\n", optopt); |
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93 return (BADCH); |
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94 } |
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95 |
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96 /* Does this option need an argument? */ |
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97 if (oli[1] != ':') { |
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98 /* don't need argument */ |
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99 optarg = NULL; |
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100 if (*place == 0) |
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101 ++optind; |
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102 } else { |
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103 /* Option-argument is either the rest of this argument or the |
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104 entire next argument. */ |
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105 if (*place) |
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106 optarg = place; |
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107 else if (argc > ++optind) |
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108 optarg = argv[optind]; |
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109 else { |
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110 /* option-argument absent */ |
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111 place = EMSG; |
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112 if (*optstring == ':') |
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113 return (BADARG); |
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114 if (opterr) |
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115 (void)fprintf(stderr, |
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116 "option requires an argument -- %c\n", |
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117 optopt); |
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118 return (BADCH); |
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119 } |
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120 place = EMSG; |
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121 ++optind; |
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122 } |
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123 return (optopt); /* return option letter */ |
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124 } |