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annotate port/getopt.c @ 63:d78c4d9fad13

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Move to port/ code that I didn't write
author David Demelier <markand@malikania.fr>
date Wed, 09 Nov 2011 19:30:33 +0100
parents getopt.c@ebf1460c331e
children 18e8c7911825
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63
d78c4d9fad13 Move to port/ code that I didn't write
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1 /*
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2 * getopt.c -- getopt(3) from FreeBSD (portable version)
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3 */
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4
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5 /*
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6 * Copyright (c) 1987, 1993, 1994
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7 * The Regents of the University of California. All rights reserved.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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11 * are met:
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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17 * 4. Neither the name of the University nor the names of its contributors
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18 * may be used to endorse or promote products derived from this software
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19 * without specific prior written permission.
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20 *
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21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31 * SUCH DAMAGE.
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32 */
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33
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34 #include <stdio.h>
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35 #include <stdlib.h>
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36 #include <string.h>
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37
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38 int opterr = 1, /* if error message should be printed */
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39 optind = 1, /* index into parent argv vector */
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40 optopt, /* character checked for validity */
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41 optreset; /* reset getopt */
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42 char *optarg; /* argument associated with option */
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43
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44 #define BADCH (int)'?'
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45 #define BADARG (int)':'
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46 #define EMSG ""
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47
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48 /*
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49 * getopt --
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50 * Parse argc/argv argument vector.
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51 */
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52 int
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53 getopt(nargc, nargv, ostr)
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54 int nargc;
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55 char * const nargv[];
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56 const char *ostr;
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57 {
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58 static char *place = EMSG; /* option letter processing */
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59 char *oli; /* option letter list index */
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60
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61 if (optreset || *place == 0) { /* update scanning pointer */
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62 optreset = 0;
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63 place = nargv[optind];
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64 if (optind >= nargc || *place++ != '-') {
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65 /* Argument is absent or is not an option */
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66 place = EMSG;
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67 return (-1);
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68 }
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69 optopt = *place++;
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70 if (optopt == '-' && *place == 0) {
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71 /* "--" => end of options */
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72 ++optind;
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73 place = EMSG;
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74 return (-1);
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75 }
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76 if (optopt == 0) {
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77 /* Solitary '-', treat as a '-' option
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78 if the program (eg su) is looking for it. */
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79 place = EMSG;
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80 if (strchr(ostr, '-') == NULL)
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81 return (-1);
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82 optopt = '-';
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83 }
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84 } else
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85 optopt = *place++;
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86
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87 /* See if option letter is one the caller wanted... */
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88 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
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89 if (*place == 0)
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90 ++optind;
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91 if (opterr && *ostr != ':')
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92 (void)fprintf(stderr,
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93 "illegal option -- %c\n", optopt);
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94 return (BADCH);
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95 }
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96
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97 /* Does this option need an argument? */
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98 if (oli[1] != ':') {
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99 /* don't need argument */
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100 optarg = NULL;
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101 if (*place == 0)
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102 ++optind;
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103 } else {
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104 /* Option-argument is either the rest of this argument or the
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105 entire next argument. */
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106 if (*place)
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107 optarg = place;
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108 else if (nargc > ++optind)
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109 optarg = nargv[optind];
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110 else {
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111 /* option-argument absent */
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112 place = EMSG;
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113 if (*ostr == ':')
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114 return (BADARG);
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115 if (opterr)
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116 (void)fprintf(stderr,
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117 "option requires an argument -- %c\n", 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 }