1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * getopt.c - Enhanced implementation of BSD getopt(1)
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4 | * Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
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5 | *
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6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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7 | */
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8 |
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9 | /*
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10 | * Version 1.0-b4: Tue Sep 23 1997. First public release.
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11 | * Version 1.0: Wed Nov 19 1997.
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12 | * Bumped up the version number to 1.0
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13 | * Fixed minor typo (CSH instead of TCSH)
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14 | * Version 1.0.1: Tue Jun 3 1998
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15 | * Fixed sizeof instead of strlen bug
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16 | * Bumped up the version number to 1.0.1
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17 | * Version 1.0.2: Thu Jun 11 1998 (not present)
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18 | * Fixed gcc-2.8.1 warnings
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19 | * Fixed --version/-V option (not present)
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20 | * Version 1.0.5: Tue Jun 22 1999
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21 | * Make -u option work (not present)
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22 | * Version 1.0.6: Tue Jun 27 2000
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23 | * No important changes
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24 | * Version 1.1.0: Tue Jun 30 2000
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25 | * Added NLS support (partly written by Arkadiusz Mi<B6>kiewicz
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26 | * <misiek@misiek.eu.org>)
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27 | * Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
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28 | * Removed --version/-V and --help/-h in
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29 | * Removed parse_error(), using bb_error_msg() from Busybox instead
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30 | * Replaced our_malloc with xmalloc and our_realloc with xrealloc
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31 | *
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32 | */
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33 |
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34 | #include <getopt.h>
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35 | #include "libbb.h"
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36 |
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37 | /* NON_OPT is the code that is returned when a non-option is found in '+'
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38 | mode */
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39 | enum {
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40 | NON_OPT = 1,
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41 | #if ENABLE_GETOPT_LONG
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42 | /* LONG_OPT is the code that is returned when a long option is found. */
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43 | LONG_OPT = 2
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44 | #endif
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45 | };
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46 |
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47 | /* For finding activated option flags. Must match getopt32 call! */
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48 | enum {
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49 | OPT_o = 0x1, // -o
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50 | OPT_n = 0x2, // -n
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51 | OPT_q = 0x4, // -q
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52 | OPT_Q = 0x8, // -Q
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53 | OPT_s = 0x10, // -s
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54 | OPT_T = 0x20, // -T
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55 | OPT_u = 0x40, // -u
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56 | #if ENABLE_GETOPT_LONG
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57 | OPT_a = 0x80, // -a
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58 | OPT_l = 0x100, // -l
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59 | #endif
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60 | SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */
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61 | };
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62 |
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63 | /* 0 is getopt_long, 1 is getopt_long_only */
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64 | #define alternative (option_mask32 & OPT_a)
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65 |
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66 | #define quiet_errors (option_mask32 & OPT_q)
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67 | #define quiet_output (option_mask32 & OPT_Q)
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68 | #define quote (!(option_mask32 & OPT_u))
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69 | #define shell_TCSH (option_mask32 & SHELL_IS_TCSH)
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70 |
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71 | /*
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72 | * This function 'normalizes' a single argument: it puts single quotes around
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73 | * it and escapes other special characters. If quote is false, it just
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74 | * returns its argument.
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75 | * Bash only needs special treatment for single quotes; tcsh also recognizes
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76 | * exclamation marks within single quotes, and nukes whitespace.
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77 | * This function returns a pointer to a buffer that is overwritten by
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78 | * each call.
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79 | */
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80 | static const char *normalize(const char *arg)
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81 | {
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82 | char *bufptr;
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83 | #if ENABLE_FEATURE_CLEAN_UP
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84 | static char *BUFFER = NULL;
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85 | free(BUFFER);
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86 | #else
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87 | char *BUFFER;
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88 | #endif
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89 |
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90 | if (!quote) { /* Just copy arg */
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91 | BUFFER = xstrdup(arg);
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92 | return BUFFER;
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93 | }
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94 |
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95 | /* Each character in arg may take up to four characters in the result:
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96 | For a quote we need a closing quote, a backslash, a quote and an
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97 | opening quote! We need also the global opening and closing quote,
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98 | and one extra character for '\0'. */
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99 | BUFFER = xmalloc(strlen(arg)*4 + 3);
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100 |
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101 | bufptr = BUFFER;
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102 | *bufptr ++= '\'';
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103 |
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104 | while (*arg) {
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105 | if (*arg == '\'') {
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106 | /* Quote: replace it with: '\'' */
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107 | *bufptr ++= '\'';
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108 | *bufptr ++= '\\';
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109 | *bufptr ++= '\'';
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110 | *bufptr ++= '\'';
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111 | } else if (shell_TCSH && *arg == '!') {
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112 | /* Exclamation mark: replace it with: \! */
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113 | *bufptr ++= '\'';
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114 | *bufptr ++= '\\';
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115 | *bufptr ++= '!';
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116 | *bufptr ++= '\'';
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117 | } else if (shell_TCSH && *arg == '\n') {
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118 | /* Newline: replace it with: \n */
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119 | *bufptr ++= '\\';
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120 | *bufptr ++= 'n';
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121 | } else if (shell_TCSH && isspace(*arg)) {
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122 | /* Non-newline whitespace: replace it with \<ws> */
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123 | *bufptr ++= '\'';
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124 | *bufptr ++= '\\';
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125 | *bufptr ++= *arg;
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126 | *bufptr ++= '\'';
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127 | } else
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128 | /* Just copy */
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129 | *bufptr ++= *arg;
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130 | arg++;
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131 | }
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132 | *bufptr ++= '\'';
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133 | *bufptr ++= '\0';
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134 | return BUFFER;
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135 | }
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136 |
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137 | /*
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138 | * Generate the output. argv[0] is the program name (used for reporting errors).
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139 | * argv[1..] contains the options to be parsed. argc must be the number of
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140 | * elements in argv (ie. 1 if there are no options, only the program name),
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141 | * optstr must contain the short options, and longopts the long options.
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142 | * Other settings are found in global variables.
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143 | */
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144 | #if !ENABLE_GETOPT_LONG
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145 | #define generate_output(argv,argc,optstr,longopts) generate_output(argv,argc,optstr)
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146 | #endif
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147 | static int generate_output(char **argv, int argc, const char *optstr, const struct option *longopts)
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148 | {
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149 | int exit_code = 0; /* We assume everything will be OK */
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150 | unsigned opt;
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151 | #if ENABLE_GETOPT_LONG
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152 | int longindex;
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153 | #endif
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154 | const char *charptr;
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155 |
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156 | if (quiet_errors) /* No error reporting from getopt(3) */
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157 | opterr = 0;
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158 | optind = 0; /* Reset getopt(3) */
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159 |
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160 | while (1) {
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161 | opt =
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162 | #if ENABLE_GETOPT_LONG
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163 | alternative ?
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164 | getopt_long_only(argc, argv, optstr, longopts, &longindex) :
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165 | getopt_long(argc, argv, optstr, longopts, &longindex);
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166 | #else
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167 | getopt(argc, argv, optstr);
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168 | #endif
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169 | if (opt == EOF)
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170 | break;
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171 | if (opt == '?' || opt == ':' )
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172 | exit_code = 1;
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173 | else if (!quiet_output) {
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174 | #if ENABLE_GETOPT_LONG
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175 | if (opt == LONG_OPT) {
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176 | printf(" --%s", longopts[longindex].name);
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177 | if (longopts[longindex].has_arg)
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178 | printf(" %s",
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179 | normalize(optarg ? optarg : ""));
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180 | } else
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181 | #endif
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182 | if (opt == NON_OPT)
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183 | printf(" %s", normalize(optarg));
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184 | else {
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185 | printf(" -%c", opt);
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186 | charptr = strchr(optstr,opt);
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187 | if (charptr != NULL && *++charptr == ':')
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188 | printf(" %s",
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189 | normalize(optarg ? optarg : ""));
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190 | }
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191 | }
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192 | }
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193 |
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194 | if (!quiet_output) {
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195 | printf(" --");
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196 | while (optind < argc)
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197 | printf(" %s", normalize(argv[optind++]));
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198 | puts("");
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199 | }
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200 | return exit_code;
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201 | }
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202 |
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203 | #if ENABLE_GETOPT_LONG
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204 | /*
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205 | * Register several long options. options is a string of long options,
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206 | * separated by commas or whitespace.
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207 | * This nukes options!
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208 | */
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209 | static struct option *add_long_options(struct option *long_options, char *options)
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210 | {
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211 | int long_nr = 0;
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212 | int arg_opt, tlen;
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213 | char *tokptr = strtok(options, ", \t\n");
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214 |
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215 | if (long_options)
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216 | while (long_options[long_nr].name)
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217 | long_nr++;
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218 |
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219 | while (tokptr) {
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220 | arg_opt = no_argument;
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221 | tlen = strlen(tokptr);
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222 | if (tlen) {
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223 | tlen--;
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224 | if (tokptr[tlen] == ':') {
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225 | arg_opt = required_argument;
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226 | if (tlen && tokptr[tlen-1] == ':') {
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227 | tlen--;
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228 | arg_opt = optional_argument;
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229 | }
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230 | tokptr[tlen] = '\0';
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231 | if (tlen == 0)
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232 | bb_error_msg_and_die("empty long option specified");
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233 | }
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234 | long_options = xrealloc(long_options,
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235 | sizeof(long_options[0]) * (long_nr+2));
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236 | long_options[long_nr].has_arg = arg_opt;
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237 | long_options[long_nr].flag = NULL;
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238 | long_options[long_nr].val = LONG_OPT;
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239 | long_options[long_nr].name = xstrdup(tokptr);
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240 | long_nr++;
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241 | memset(&long_options[long_nr], 0, sizeof(long_options[0]));
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242 | }
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243 | tokptr = strtok(NULL, ", \t\n");
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244 | }
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245 | return long_options;
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246 | }
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247 | #endif
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248 |
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249 | static void set_shell(const char *new_shell)
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250 | {
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251 | if (!strcmp(new_shell,"bash") || !strcmp(new_shell,"sh"))
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252 | return;
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253 | if (!strcmp(new_shell,"tcsh") || !strcmp(new_shell,"csh"))
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254 | option_mask32 |= SHELL_IS_TCSH;
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255 | else
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256 | bb_error_msg("unknown shell '%s', assuming bash", new_shell);
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257 | }
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258 |
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259 |
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260 | /* Exit codes:
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261 | * 0) No errors, successful operation.
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262 | * 1) getopt(3) returned an error.
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263 | * 2) A problem with parameter parsing for getopt(1).
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264 | * 3) Internal error, out of memory
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265 | * 4) Returned for -T
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266 | */
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267 |
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268 | #if ENABLE_GETOPT_LONG
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269 | static const char getopt_longopts[] ALIGN1 =
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270 | "options\0" Required_argument "o"
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271 | "longoptions\0" Required_argument "l"
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272 | "quiet\0" No_argument "q"
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273 | "quiet-output\0" No_argument "Q"
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274 | "shell\0" Required_argument "s"
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275 | "test\0" No_argument "T"
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276 | "unquoted\0" No_argument "u"
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277 | "alternative\0" No_argument "a"
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278 | "name\0" Required_argument "n"
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279 | ;
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280 | #endif
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281 |
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282 | int getopt_main(int argc, char *argv[]);
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283 | int getopt_main(int argc, char *argv[])
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284 | {
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285 | char *optstr = NULL;
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286 | char *name = NULL;
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287 | unsigned opt;
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288 | const char *compatible;
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289 | char *s_arg;
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290 | #if ENABLE_GETOPT_LONG
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291 | struct option *long_options = NULL;
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292 | llist_t *l_arg = NULL;
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293 | #endif
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294 |
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295 | compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */
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296 |
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297 | if (argc == 1) {
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298 | if (compatible) {
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299 | /* For some reason, the original getopt gave no error
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300 | when there were no arguments. */
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301 | printf(" --\n");
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302 | return 0;
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303 | }
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304 | bb_error_msg_and_die("missing optstring argument");
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305 | }
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306 |
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307 | if (argv[1][0] != '-' || compatible) {
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308 | char *s;
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309 |
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310 | option_mask32 |= OPT_u; /* quoting off */
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311 | s = xstrdup(argv[1] + strspn(argv[1], "-+"));
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312 | argv[1] = argv[0];
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313 | return generate_output(argv+1, argc-1, s, long_options);
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314 | }
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315 |
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316 | #if !ENABLE_GETOPT_LONG
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317 | opt = getopt32(argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg);
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318 | #else
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319 | applet_long_options = getopt_longopts;
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320 | opt_complementary = "l::";
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321 | opt = getopt32(argv, "+o:n:qQs:Tual:",
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322 | &optstr, &name, &s_arg, &l_arg);
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323 | /* Effectuate the read options for the applet itself */
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324 | while (l_arg) {
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325 | long_options = add_long_options(long_options, l_arg->data);
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326 | l_arg = l_arg->link;
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327 | }
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328 | #endif
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329 |
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330 | if (opt & OPT_s) {
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331 | set_shell(s_arg);
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332 | }
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333 |
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334 | if (opt & OPT_T) {
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335 | return 4;
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336 | }
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337 |
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338 | /* All options controlling the applet have now been parsed */
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339 | if (!optstr) {
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340 | if (optind >= argc)
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341 | bb_error_msg_and_die("missing optstring argument");
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342 | optstr = argv[optind++];
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343 | }
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344 |
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345 | argv[optind-1] = name ? name : argv[0];
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346 | return generate_output(argv+optind-1, argc-optind+1, optstr, long_options);
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347 | }
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