1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * universal getopt_ulflags implementation for busybox
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4 | *
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5 | * Copyright (C) 2003-2005 Vladimir Oleynik <dzo@simtreas.ru>
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6 | *
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7 | * This program is free software; you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation; either version 2 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * This program is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 | * General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with this program; if not, write to the Free Software
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19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 | *
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21 | */
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22 |
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23 | #include <getopt.h>
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24 | #include <string.h>
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25 | #include <assert.h>
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26 | #include <stdlib.h>
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27 | #include "libbb.h"
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28 |
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29 | /* Documentation
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30 |
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31 | unsigned long
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32 | bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
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33 |
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34 | The command line options must be declared in const char
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35 | *applet_opts as a string of chars, for example:
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36 |
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37 | flags = bb_getopt_ulflags(argc, argv, "rnug");
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38 |
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39 | If one of the given options is found, a flag value is added to
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40 | the return value (an unsigned long).
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41 |
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42 | The flag value is determined by the position of the char in
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43 | applet_opts string. For example, in the above case:
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44 |
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45 | flags = bb_getopt_ulflags(argc, argv, "rnug");
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46 |
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47 | "r" will add 1 (bit 0)
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48 | "n" will add 2 (bit 1)
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49 | "u will add 4 (bit 2)
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50 | "g" will add 8 (bit 3)
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51 |
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52 | and so on. You can also look at the return value as a bit
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53 | field and each option sets one bit.
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54 |
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55 | ":" If one of the options requires an argument, then add a ":"
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56 | after the char in applet_opts and provide a pointer to store
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57 | the argument. For example:
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58 |
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59 | char *pointer_to_arg_for_a;
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60 | char *pointer_to_arg_for_b;
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61 | char *pointer_to_arg_for_c;
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62 | char *pointer_to_arg_for_d;
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63 |
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64 | flags = bb_getopt_ulflags(argc, argv, "a:b:c:d:",
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65 | &pointer_to_arg_for_a, &pointer_to_arg_for_b,
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66 | &pointer_to_arg_for_c, &pointer_to_arg_for_d);
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67 |
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68 | The type of the pointer (char* or llist_t*) may be controlled
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69 | by the "::" special separator that is set in the external string
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70 | bb_opt_complementally (see below for more info).
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71 |
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72 | "+" If the first character in the applet_opts string is a plus,
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73 | then option processing will stop as soon as a non-option is
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74 | encountered in the argv array. Useful for applets like env
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75 | which should not process arguments to subprograms:
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76 | env -i ls -d /
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77 | Here we want env to process just the '-i', not the '-d'.
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78 |
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79 | const struct option *bb_applet_long_options
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80 |
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81 | This struct allows you to define long options. The syntax for
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82 | declaring the array is just like that of getopt's longopts.
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83 | (see getopt(3))
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84 |
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85 | static const struct option applet_long_options[] = {
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86 | { "verbose", 0, 0, 'v' },
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87 | { 0, 0, 0, 0 }
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88 | };
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89 | bb_applet_long_options = applet_long_options;
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90 |
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91 | The last member of struct option (val) typically is set to
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92 | matching short option from applet_opts. If there is no matching
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93 | char in applet_opts, then:
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94 | - return bit have next position after short options
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95 | - if has_arg is not "no_argument", use ptr for arg also
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96 | - bb_opt_complementally affects it too
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97 |
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98 | Note: a good applet will make long options configurable via the
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99 | config process and not a required feature. The current standard
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100 | is to name the config option CONFIG_FEATURE_<applet>_LONG_OPTIONS.
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101 |
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102 | const char *bb_opt_complementally
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103 | this should be bb_opt_complementary, but we'll just keep it as
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104 | bb_opt_complementally due to the Russian origins
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105 |
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106 | ":" The colon (":") is used to separate groups of two or more chars
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107 | and/or groups of chars and special characters (stating some
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108 | conditions to be checked).
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109 |
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110 | "abc" If groups of two or more chars are specified, the first char
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111 | is the main option and the other chars are secondary options.
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112 | Their flags will be turned on if the main option is found even
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113 | if they are not specifed on the command line. For example:
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114 |
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115 | bb_opt_complementally = "abc";
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116 |
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117 | flags = bb_getopt_ulflags(argc, argv, "abcd")
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118 |
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119 | If getopt() finds "-a" on the command line, then
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120 | bb_getopt_ulflags's return value will be as if "-a -b -c" were
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121 | found.
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122 |
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123 | "ww" Adjacent double options have a counter associated which indicates
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124 | the number of occurences of the option.
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125 | For example the ps applet needs:
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126 | if w is given once, GNU ps sets the width to 132,
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127 | if w is given more than once, it is "unlimited"
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128 |
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129 | int w_counter = 0;
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130 | bb_opt_complementally = "ww";
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131 | bb_getopt_ulflags(argc, argv, "w", &w_counter);
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132 |
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133 | if(w_counter)
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134 | width = (w_counter == 1) ? 132 : INT_MAX;
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135 | else
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136 | get_terminal_width(...&width...);
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137 |
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138 | w_counter is a pointer to an integer. It has to be passed to
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139 | bb_getopt_ulflags() after all other option argument sinks.
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140 | For example: accept multiple -v to indicate the level of verbosity
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141 | and for each -b optarg, add optarg to my_b. Finally, if b is given,
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142 | turn off c and vice versa:
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143 |
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144 | llist_t *my_b = NULL;
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145 | int verbose_level = 0;
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146 | bb_opt_complementally = "vv:b::b-c:c-b";
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147 | f = bb_getopt_ulflags(argc, argv, "vb:c", &my_b, &verbose_level);
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148 | if((f & 2)) // -c after -b unsets -b flag
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149 | while(my_b) { dosomething_with(my_b->data) ; my_b = my_b->link; }
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150 | if(my_b) // but llist is stored if -b is specified
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151 | free_llist(my_b);
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152 | if(verbose_level) bb_printf("verbose level is %d\n", verbose_level);
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153 |
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154 | Special characters:
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155 |
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156 | "-" A dash between two options causes the second of the two
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157 | to be unset (and ignored) if it is given on the command line.
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158 |
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159 | [FIXME: what if they are the same? like "x-x"? Is it ever useful?]
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160 |
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161 | For example:
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162 | The du applet has the options "-s" and "-d depth". If
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163 | bb_getopt_ulflags finds -s, then -d is unset or if it finds -d
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164 | then -s is unset. (Note: busybox implements the GNU
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165 | "--max-depth" option as "-d".) To obtain this behavior, you
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166 | set bb_opt_complementally = "s-d:d-s". Only one flag value is
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167 | added to bb_getopt_ulflags's return value depending on the
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168 | position of the options on the command line. If one of the
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169 | two options requires an argument pointer (":" in applet_opts
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170 | as in "d:") optarg is set accordingly.
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171 |
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172 | char *smax_print_depth;
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173 |
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174 | bb_opt_complementally = "s-d:d-s:x-x";
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175 | opt = bb_getopt_ulflags(argc, argv, "sd:x", &smax_print_depth);
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176 |
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177 | if (opt & 2)
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178 | max_print_depth = atoi(smax_print_depth);
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179 | if (opt & 4)
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180 | printf("Detected odd -x usage\n");
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181 |
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182 | "-" A dash as the first char in a bb_opt_complementally group forces
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183 | all arguments to be treated as options, even if they have
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184 | no leading dashes. Next char in this case can't be a digit (0-9),
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185 | use ':' or end of line. For example:
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186 |
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187 | bb_opt_complementally = "-:w-x:x-w";
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188 | bb_getopt_ulflags(argc, argv, "wx");
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189 |
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190 | Allows any arguments to be given without a dash (./program w x)
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191 | as well as with a dash (./program -x).
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192 |
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193 | "-N" A dash as the first char in a bb_opt_complementally group followed
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194 | by a single digit (0-9) means that at least N non-option
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195 | arguments must be present on the command line
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196 |
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197 | "V-" An option with dash before colon or end-of-line results in
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198 | bb_show_usage being called if this option is encountered.
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199 | This is typically used to implement "print verbose usage message
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200 | and exit" option.
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201 |
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202 | "--" A double dash between two options, or between an option and a group
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203 | of options, means that they are mutually exclusive. Unlike
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204 | the "-" case above, an error will be forced if the options
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205 | are used together.
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206 |
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207 | For example:
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208 | The cut applet must have only one type of list specified, so
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209 | -b, -c and -f are mutally exclusive and should raise an error
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210 | if specified together. In this case you must set
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211 | bb_opt_complementally = "b--cf:c--bf:f--bc". If two of the
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212 | mutually exclusive options are found, bb_getopt_ulflags's
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213 | return value will have the error flag set (BB_GETOPT_ERROR) so
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214 | that we can check for it:
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215 |
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216 | if (flags & BB_GETOPT_ERROR)
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217 | bb_show_usage();
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218 |
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219 | "?" A "?" as the first char in a bb_opt_complementally group means:
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220 | if BB_GETOPT_ERROR is detected, don't return, call bb_show_usage
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221 | and exit instead. Next char after '?' can't be a digit.
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222 |
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223 | "?N" A "?" as the first char in a bb_opt_complementally group followed
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224 | by a single digit (0-9) means that at most N arguments must be present
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225 | on the command line.
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226 |
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227 | "::" A double colon after a char in bb_opt_complementally means that the
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228 | option can occur multiple times. Each occurrence will be saved as
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229 | a llist_t element instead of char*.
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230 |
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231 | For example:
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232 | The grep applet can have one or more "-e pattern" arguments.
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233 | In this case you should use bb_getopt_ulflags() as follows:
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234 |
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235 | llist_t *patterns = NULL;
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236 |
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237 | (this pointer must be initializated to NULL if the list is empty
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238 | as required by *llist_add_to(llist_t *old_head, char *new_item).)
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239 |
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240 | bb_opt_complementally = "e::";
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241 |
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242 | bb_getopt_ulflags(argc, argv, "e:", &patterns);
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243 | $ grep -e user -e root /etc/passwd
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244 | root:x:0:0:root:/root:/bin/bash
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245 | user:x:500:500::/home/user:/bin/bash
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246 |
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247 | "--" A double dash at the beginning of bb_opt_complementally means the
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248 | argv[1] string should always be treated as options, even if it isn't
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249 | prefixed with a "-". This is to support the special syntax in applets
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250 | such as "ar" and "tar":
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251 | tar xvf foo.tar
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252 |
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253 | "?" An "?" between an option and a group of options means that
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254 | at least one of them is required to occur if the first option
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255 | occurs in preceding command line arguments.
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256 |
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257 | For example from "id" applet:
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258 |
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259 | // Don't allow -n -r -rn -ug -rug -nug -rnug
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260 | bb_opt_complementally = "r?ug:n?ug:?u--g:g--u";
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261 | flags = bb_getopt_ulflags(argc, argv, "rnug");
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262 |
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263 | This example allowed only:
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264 | $ id; id -u; id -g; id -ru; id -nu; id -rg; id -ng; id -rnu; id -rng
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265 |
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266 | "X" A bb_opt_complementally group with just a single letter means
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267 | that this this option is required. If more than one such group exists,
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268 | at least one option is required to occur (not all of them).
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269 | For example from "start-stop-daemon" applet:
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270 |
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271 | // Don't allow -KS -SK, but -S or -K is required
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272 | bb_opt_complementally = "K:S:?K--S:S--K";
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273 | flags = bb_getopt_ulflags(argc, argv, "KS...);
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274 |
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275 |
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276 | "x--x" give error if double or more used -x option
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277 |
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278 | Don't forget to use ':'. For example "?322-22-23X-x-a" is interpreted as
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279 | "?3:22:-2:2-2:2-3Xa:2--x": max 3 args; count uses of '-2'; min 2 args;
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280 | if there is a '-2' option then unset '-3', '-X' and '-a'; if there is
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281 | a '-2' and after it a '-x' then error out.
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282 |
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283 | */
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284 |
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285 | /* this should be bb_opt_complementary, but we'll just keep it as
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286 | bb_opt_complementally due to the Russian origins */
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287 | const char *bb_opt_complementally;
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288 |
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289 | typedef struct {
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290 | int opt;
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291 | int list_flg;
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292 | unsigned long switch_on;
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293 | unsigned long switch_off;
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294 | unsigned long incongruously;
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295 | unsigned long requires;
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296 | void **optarg; /* char **optarg or llist_t **optarg */
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297 | int *counter;
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298 | } t_complementally;
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299 |
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300 | /* You can set bb_applet_long_options for parse called long options */
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301 | #if ENABLE_GETOPT_LONG
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302 | static const struct option bb_default_long_options[] = {
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303 | /* { "help", 0, NULL, '?' }, */
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304 | { 0, 0, 0, 0 }
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305 | };
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306 |
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307 | const struct option *bb_applet_long_options = bb_default_long_options;
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308 | #endif
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309 |
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310 | unsigned long
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311 | bb_getopt_ulflags (int argc, char **argv, const char *applet_opts, ...)
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312 | {
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313 | unsigned long flags = 0;
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314 | unsigned long requires = 0;
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315 | t_complementally complementally[sizeof(flags) * 8 + 1];
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316 | int c;
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317 | const unsigned char *s;
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318 | t_complementally *on_off;
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319 | va_list p;
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320 | #if ENABLE_GETOPT_LONG
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321 | const struct option *l_o;
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322 | #endif
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323 | unsigned long trigger;
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324 | #ifdef CONFIG_PS
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325 | char **pargv = NULL;
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326 | #endif
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327 | int min_arg = 0;
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328 | int max_arg = -1;
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329 |
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330 | #define SHOW_USAGE_IF_ERROR 1
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331 | #define ALL_ARGV_IS_OPTS 2
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332 | #define FIRST_ARGV_IS_OPT 4
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333 | #define FREE_FIRST_ARGV_IS_OPT 8
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334 | int spec_flgs = 0;
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335 |
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336 | va_start (p, applet_opts);
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337 |
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338 | c = 0;
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339 | on_off = complementally;
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340 | memset(on_off, 0, sizeof(complementally));
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341 |
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342 | /* skip GNU extension */
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343 | s = (const unsigned char *)applet_opts;
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344 | if(*s == '+' || *s == '-')
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345 | s++;
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346 | for (; *s; s++) {
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347 | if(c >= (int)(sizeof(flags)*8))
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348 | break;
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349 | on_off->opt = *s;
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350 | on_off->switch_on = (1 << c);
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351 | if (s[1] == ':') {
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352 | on_off->optarg = va_arg (p, void **);
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353 | do
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354 | s++;
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355 | while (s[1] == ':');
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356 | }
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357 | on_off++;
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358 | c++;
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359 | }
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360 |
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361 | #if ENABLE_GETOPT_LONG
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362 | for(l_o = bb_applet_long_options; l_o->name; l_o++) {
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363 | if(l_o->flag)
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364 | continue;
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365 | for(on_off = complementally; on_off->opt != 0; on_off++)
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366 | if(on_off->opt == l_o->val)
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367 | break;
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368 | if(on_off->opt == 0) {
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369 | if(c >= (int)(sizeof(flags)*8))
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370 | break;
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371 | on_off->opt = l_o->val;
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372 | on_off->switch_on = (1 << c);
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373 | if(l_o->has_arg != no_argument)
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374 | on_off->optarg = va_arg (p, void **);
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375 | c++;
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376 | }
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377 | }
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378 | #endif /* ENABLE_GETOPT_LONG */
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379 | for (s = (const unsigned char *)bb_opt_complementally; s && *s; s++) {
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380 | t_complementally *pair;
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381 | unsigned long *pair_switch;
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382 |
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383 | if (*s == ':')
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384 | continue;
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385 | c = s[1];
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386 | if(*s == '?') {
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387 | if(c < '0' || c > '9') {
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388 | spec_flgs |= SHOW_USAGE_IF_ERROR;
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389 | } else {
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390 | max_arg = c - '0';
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391 | s++;
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392 | }
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393 | continue;
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394 | }
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395 | if(*s == '-') {
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396 | if(c < '0' || c > '9') {
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397 | if(c == '-') {
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398 | spec_flgs |= FIRST_ARGV_IS_OPT;
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399 | s++;
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400 | } else
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401 | spec_flgs |= ALL_ARGV_IS_OPTS;
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402 | } else {
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403 | min_arg = c - '0';
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404 | s++;
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405 | }
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406 | continue;
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407 | }
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408 | for (on_off = complementally; on_off->opt; on_off++)
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409 | if (on_off->opt == *s)
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410 | break;
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411 | if(c == ':' && s[2] == ':') {
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412 | on_off->list_flg++;
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413 | continue;
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414 | }
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415 | if(c == ':' || c == '\0') {
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416 | requires |= on_off->switch_on;
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417 | continue;
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418 | }
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419 | if(c == '-' && (s[2] == ':' || s[2] == '\0')) {
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420 | flags |= on_off->switch_on;
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421 | on_off->incongruously |= on_off->switch_on;
|
---|
422 | s++;
|
---|
423 | continue;
|
---|
424 | }
|
---|
425 | if(c == *s) {
|
---|
426 | on_off->counter = va_arg (p, int *);
|
---|
427 | s++;
|
---|
428 | }
|
---|
429 | pair = on_off;
|
---|
430 | pair_switch = &(pair->switch_on);
|
---|
431 | for(s++; *s && *s != ':'; s++) {
|
---|
432 | if(*s == '?') {
|
---|
433 | pair_switch = &(pair->requires);
|
---|
434 | } else if (*s == '-') {
|
---|
435 | if(pair_switch == &(pair->switch_off))
|
---|
436 | pair_switch = &(pair->incongruously);
|
---|
437 | else
|
---|
438 | pair_switch = &(pair->switch_off);
|
---|
439 | } else {
|
---|
440 | for (on_off = complementally; on_off->opt; on_off++)
|
---|
441 | if (on_off->opt == *s) {
|
---|
442 | *pair_switch |= on_off->switch_on;
|
---|
443 | break;
|
---|
444 | }
|
---|
445 | }
|
---|
446 | }
|
---|
447 | s--;
|
---|
448 | }
|
---|
449 | va_end (p);
|
---|
450 |
|
---|
451 | #if defined(CONFIG_AR) || defined(CONFIG_TAR)
|
---|
452 | if((spec_flgs & FIRST_ARGV_IS_OPT)) {
|
---|
453 | if(argv[1] && argv[1][0] != '-' && argv[1][0] != '\0') {
|
---|
454 | argv[1] = bb_xasprintf("-%s", argv[1]);
|
---|
455 | if(ENABLE_FEATURE_CLEAN_UP)
|
---|
456 | spec_flgs |= FREE_FIRST_ARGV_IS_OPT;
|
---|
457 | }
|
---|
458 | }
|
---|
459 | #endif
|
---|
460 | #if ENABLE_GETOPT_LONG
|
---|
461 | while ((c = getopt_long (argc, argv, applet_opts,
|
---|
462 | bb_applet_long_options, NULL)) >= 0) {
|
---|
463 | #else
|
---|
464 | while ((c = getopt (argc, argv, applet_opts)) >= 0) {
|
---|
465 | #endif /* ENABLE_GETOPT_LONG */
|
---|
466 | #ifdef CONFIG_PS
|
---|
467 | loop_arg_is_opt:
|
---|
468 | #endif
|
---|
469 | for (on_off = complementally; on_off->opt != c; on_off++) {
|
---|
470 | /* c==0 if long opt have non NULL flag */
|
---|
471 | if(on_off->opt == 0 && c != 0)
|
---|
472 | bb_show_usage ();
|
---|
473 | }
|
---|
474 | if(flags & on_off->incongruously) {
|
---|
475 | if((spec_flgs & SHOW_USAGE_IF_ERROR))
|
---|
476 | bb_show_usage ();
|
---|
477 | flags |= BB_GETOPT_ERROR;
|
---|
478 | }
|
---|
479 | trigger = on_off->switch_on & on_off->switch_off;
|
---|
480 | flags &= ~(on_off->switch_off ^ trigger);
|
---|
481 | flags |= on_off->switch_on ^ trigger;
|
---|
482 | flags ^= trigger;
|
---|
483 | if(on_off->counter)
|
---|
484 | (*(on_off->counter))++;
|
---|
485 | if(on_off->list_flg) {
|
---|
486 | llist_add_to((llist_t **)(on_off->optarg), optarg);
|
---|
487 | } else if (on_off->optarg) {
|
---|
488 | *(char **)(on_off->optarg) = optarg;
|
---|
489 | }
|
---|
490 | #ifdef CONFIG_PS
|
---|
491 | if(pargv != NULL)
|
---|
492 | break;
|
---|
493 | #endif
|
---|
494 | }
|
---|
495 |
|
---|
496 | #ifdef CONFIG_PS
|
---|
497 | if((spec_flgs & ALL_ARGV_IS_OPTS)) {
|
---|
498 | /* process argv is option, for example "ps" applet */
|
---|
499 | if(pargv == NULL)
|
---|
500 | pargv = argv + optind;
|
---|
501 | while(*pargv) {
|
---|
502 | c = **pargv;
|
---|
503 | if(c == '\0') {
|
---|
504 | pargv++;
|
---|
505 | } else {
|
---|
506 | (*pargv)++;
|
---|
507 | goto loop_arg_is_opt;
|
---|
508 | }
|
---|
509 | }
|
---|
510 | }
|
---|
511 | #endif
|
---|
512 |
|
---|
513 | #if (defined(CONFIG_AR) || defined(CONFIG_TAR)) && \
|
---|
514 | defined(CONFIG_FEATURE_CLEAN_UP)
|
---|
515 | if((spec_flgs & FREE_FIRST_ARGV_IS_OPT))
|
---|
516 | free(argv[1]);
|
---|
517 | #endif
|
---|
518 | /* check depending requires for given options */
|
---|
519 | for (on_off = complementally; on_off->opt; on_off++) {
|
---|
520 | if(on_off->requires && (flags & on_off->switch_on) &&
|
---|
521 | (flags & on_off->requires) == 0)
|
---|
522 | bb_show_usage ();
|
---|
523 | }
|
---|
524 | if(requires && (flags & requires) == 0)
|
---|
525 | bb_show_usage ();
|
---|
526 | argc -= optind;
|
---|
527 | if(argc < min_arg || (max_arg >= 0 && argc > max_arg))
|
---|
528 | bb_show_usage ();
|
---|
529 | return flags;
|
---|
530 | }
|
---|