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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License, Version 1.0 only
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6 * (the "License"). You may not use this file except in compliance
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7 * with the License.
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8 *
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9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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10 * or http://www.opensolaris.org/os/licensing.
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11 * See the License for the specific language governing permissions
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12 * and limitations under the License.
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13 *
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14 * When distributing Covered Code, include this CDDL HEADER in each
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15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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16 * If applicable, add the following below this CDDL HEADER, with the
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17 * fields enclosed by brackets "[]" replaced with your own identifying
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18 * information: Portions Copyright [yyyy] [name of copyright owner]
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19 *
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20 * CDDL HEADER END
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21 */
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22 /*
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23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
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24 * Use is subject to license terms.
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25 */
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26
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27 #pragma ident "@(#)getopt_ext.c 1.2 05/06/08 SMI"
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28
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29 #include <stdio.h>
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30 #include <string.h>
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31 #include "volume_error.h"
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32 #include "getopt_ext.h"
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33
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34 /*
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35 * Functions
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36 */
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37
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38 /*
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39 * Identical to getopt(3), except that
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40 *
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41 * 1. If "-" is the first character of optstring, each non-option argv
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42 * element is handled as if it were the argument of an option with
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43 * character code GETOPT_NON_OPTION_ARG. The result is that
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44 * GETOPT_DONE_PARSING will not be returned until the end of the
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45 * argument list has been reached.
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46 *
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47 * This mirrors the functionality provided by GNU getopt.
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48 *
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49 * 2. GETOPT_ERR_INVALID_OPT or GETOPT_ERR_MISSING_ARG is returned
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50 * instead of '?'. Subsequently "-?" can be used as a valid
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51 * option.
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52 *
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53 * 3. GETOPT_DONE_PARSING, GETOPT_ERR_INVALID_ARG, or
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54 * GETOPT_NON_OPTION_ARG is returned instead of -1.
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55 *
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56 * @param argc
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57 * The number of arguments in the array
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58 *
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59 * @param argv
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60 * The argument array
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61 *
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62 * @param optstring
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63 * The option letters, with ':' following options with
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64 * required arguments. See note about "-" as the first
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65 * character.
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66 *
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67 * @return GETOPT_ERR_INVALID_OPT
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68 * if the option is not found in optstring
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69 *
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70 * GETOPT_ERR_MISSING_ARG
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71 * if the option requires an argument which is missing
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72 *
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73 * GETOPT_ERR_INVALID_ARG
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74 * if "-" is not the first character in optstring and a
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75 * non-option argument is encountered
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76 *
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77 * GETOPT_NON_OPTION_ARG
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78 * if "-" is the first character in optstring and a
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79 * non-option argument is encountered
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80 *
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81 * GETOPT_DONE_PARSING
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82 * if the end of the argument list is reached
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83 *
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84 * <optopt>
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85 * the option character itself, if none of the above
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86 * scenarios applies.
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87 */
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88 extern int
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89 getopt_ext(
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90 int argc,
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91 char * const argv[],
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92 const char *optstring)
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93 {
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94 int c;
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95 int handle_non_options = (*optstring == '-');
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96
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97 /* Is "-" the first character of optstring? */
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98 if (handle_non_options) {
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99 /* getopt(3) doesn't understand "-" */
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100 optstring++;
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101 }
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102
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103 switch (c = getopt(argc, argv, optstring)) {
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104
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105 /*
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106 * getopt(3) returns -1 when 1) it encounters a non-option
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107 * argument or 2) reaches the end of the argument list.
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108 * Distinguish from the two possibilities.
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109 */
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110 case -1:
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111 if (optind < argc) {
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112 optarg = argv[optind];
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113
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114 /* Non-option argument found */
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115 if (handle_non_options) {
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116 /* Non-option arguments are valid */
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117 c = GETOPT_NON_OPTION_ARG;
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118 optind++;
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119 } else {
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120 /* Non-option arguments are invalid */
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121 c = GETOPT_ERR_INVALID_ARG;
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122 }
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123 } else {
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124 /* End of the argument list reached */
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125 c = GETOPT_DONE_PARSING;
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126 }
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127 break;
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128
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129 /*
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130 * getopt(3) returns '?' when 1) the "-?" option is
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131 * encountered, 2) an invalid option is given or 3) a
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132 * valid option requiring an argument is found but no
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133 * argument is specified. Distinguish from the three
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134 * possibilities.
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135 */
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136 case '?':
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137 /* Is this an error or was -? encountered? */
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138 if (optopt != '?') {
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139 if (strchr(optstring, optopt) == NULL) {
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140 /* Invalid option */
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141 c = GETOPT_ERR_INVALID_OPT;
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142 optarg = argv[optind-1];
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143 } else {
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144 /* Valid option without required argument */
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145 c = GETOPT_ERR_MISSING_ARG;
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146 }
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147 }
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148 }
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149
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150 return (c);
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151 }
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