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326 | f9daq | 1 | // XGetopt.cpp Version 1.2 |
2 | // |
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3 | // Author: Hans Dietrich |
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4 | // hdietrich2@hotmail.com |
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5 | // |
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6 | // Description: |
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7 | // XGetopt.cpp implements getopt(), a function to parse command lines. |
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8 | // |
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9 | // History |
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10 | // Version 1.2 - 2003 May 17 |
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11 | // - Added Unicode support |
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12 | // |
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13 | // Version 1.1 - 2002 March 10 |
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14 | // - Added example to XGetopt.cpp module header |
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15 | // |
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16 | // This software is released into the public domain. |
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17 | // You are free to use it in any way you like. |
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18 | // |
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19 | // This software is provided "as is" with no expressed |
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20 | // or implied warranty. I accept no liability for any |
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21 | // damage or loss of business that this software may cause. |
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22 | // |
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23 | /////////////////////////////////////////////////////////////////////////////// |
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24 | |||
25 | |||
26 | /////////////////////////////////////////////////////////////////////////////// |
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27 | // if you are using precompiled headers then include this line: |
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28 | //#include "stdafx.h" |
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29 | /////////////////////////////////////////////////////////////////////////////// |
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30 | |||
31 | |||
32 | /////////////////////////////////////////////////////////////////////////////// |
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33 | // if you are not using precompiled headers then include these lines: |
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34 | #include <windows.h> |
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35 | #include <stdio.h> |
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36 | #include <tchar.h> |
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37 | /////////////////////////////////////////////////////////////////////////////// |
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38 | |||
39 | |||
40 | #include "XGetopt.h" |
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41 | |||
42 | |||
43 | /////////////////////////////////////////////////////////////////////////////// |
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44 | // |
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45 | // X G e t o p t . c p p |
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46 | // |
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47 | // |
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48 | // NAME |
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49 | // getopt -- parse command line options |
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50 | // |
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51 | // SYNOPSIS |
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52 | // int getopt(int argc, TCHAR *argv[], TCHAR *optstring) |
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53 | // |
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54 | // extern TCHAR *optarg; |
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55 | // extern int optind; |
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56 | // |
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57 | // DESCRIPTION |
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58 | // The getopt() function parses the command line arguments. Its |
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59 | // arguments argc and argv are the argument count and array as |
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60 | // passed into the application on program invocation. In the case |
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61 | // of Visual C++ programs, argc and argv are available via the |
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62 | // variables __argc and __argv (double underscores), respectively. |
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63 | // getopt returns the next option letter in argv that matches a |
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64 | // letter in optstring. (Note: Unicode programs should use |
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65 | // __targv instead of __argv. Also, all character and string |
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66 | // literals should be enclosed in _T( ) ). |
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67 | // |
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68 | // optstring is a string of recognized option letters; if a letter |
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69 | // is followed by a colon, the option is expected to have an argument |
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70 | // that may or may not be separated from it by white space. optarg |
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71 | // is set to point to the start of the option argument on return from |
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72 | // getopt. |
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73 | // |
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74 | // Option letters may be combined, e.g., "-ab" is equivalent to |
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75 | // "-a -b". Option letters are case sensitive. |
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76 | // |
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77 | // getopt places in the external variable optind the argv index |
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78 | // of the next argument to be processed. optind is initialized |
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79 | // to 0 before the first call to getopt. |
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80 | // |
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81 | // When all options have been processed (i.e., up to the first |
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82 | // non-option argument), getopt returns EOF, optarg will point |
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83 | // to the argument, and optind will be set to the argv index of |
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84 | // the argument. If there are no non-option arguments, optarg |
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85 | // will be set to NULL. |
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86 | // |
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87 | // The special option "--" may be used to delimit the end of the |
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88 | // options; EOF will be returned, and "--" (and everything after it) |
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89 | // will be skipped. |
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90 | // |
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91 | // RETURN VALUE |
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92 | // For option letters contained in the string optstring, getopt |
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93 | // will return the option letter. getopt returns a question mark (?) |
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94 | // when it encounters an option letter not included in optstring. |
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95 | // EOF is returned when processing is finished. |
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96 | // |
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97 | // BUGS |
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98 | // 1) Long options are not supported. |
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99 | // 2) The GNU double-colon extension is not supported. |
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100 | // 3) The environment variable POSIXLY_CORRECT is not supported. |
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101 | // 4) The + syntax is not supported. |
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102 | // 5) The automatic permutation of arguments is not supported. |
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103 | // 6) This implementation of getopt() returns EOF if an error is |
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104 | // encountered, instead of -1 as the latest standard requires. |
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105 | // |
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106 | // EXAMPLE |
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107 | // BOOL CMyApp::ProcessCommandLine(int argc, TCHAR *argv[]) |
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108 | // { |
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109 | // int c; |
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110 | // |
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111 | // while ((c = getopt(argc, argv, _T("aBn:"))) != EOF) |
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112 | // { |
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113 | // switch (c) |
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114 | // { |
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115 | // case _T('a'): |
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116 | // TRACE(_T("option a\n")); |
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117 | // // |
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118 | // // set some flag here |
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119 | // // |
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120 | // break; |
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121 | // |
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122 | // case _T('B'): |
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123 | // TRACE( _T("option B\n")); |
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124 | // // |
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125 | // // set some other flag here |
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126 | // // |
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127 | // break; |
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128 | // |
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129 | // case _T('n'): |
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130 | // TRACE(_T("option n: value=%d\n"), atoi(optarg)); |
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131 | // // |
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132 | // // do something with value here |
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133 | // // |
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134 | // break; |
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135 | // |
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136 | // case _T('?'): |
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137 | // TRACE(_T("ERROR: illegal option %s\n"), argv[optind-1]); |
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138 | // return FALSE; |
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139 | // break; |
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140 | // |
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141 | // default: |
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142 | // TRACE(_T("WARNING: no handler for option %c\n"), c); |
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143 | // return FALSE; |
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144 | // break; |
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145 | // } |
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146 | // } |
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147 | // // |
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148 | // // check for non-option args here |
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149 | // // |
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150 | // return TRUE; |
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151 | // } |
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152 | // |
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153 | /////////////////////////////////////////////////////////////////////////////// |
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154 | |||
155 | //TCHAR *optarg; // global argument pointer |
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156 | char *optarg; // global argument pointer |
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157 | int optind = 0; // global argv index |
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158 | |||
159 | //int getopt(int argc, TCHAR *argv[], TCHAR *optstring) |
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160 | int getopt(int argc, char *argv[], char *optstring) |
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161 | { |
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162 | //static TCHAR *next = NULL; |
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163 | static char *next = NULL; |
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164 | if (optind == 0) |
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165 | next = NULL; |
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166 | |||
167 | optarg = NULL; |
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168 | |||
169 | if (next == NULL || *next == _T('\0')) |
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170 | { |
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171 | if (optind == 0) |
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172 | optind++; |
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173 | |||
174 | if (optind >= argc || argv[optind][0] != _T('-') || argv[optind][1] == _T('\0')) |
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175 | { |
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176 | optarg = NULL; |
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177 | if (optind < argc) |
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178 | optarg = argv[optind]; |
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179 | return EOF; |
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180 | } |
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181 | |||
182 | if (strcmp( argv[optind], _T("--")) == 0) |
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183 | { |
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184 | optind++; |
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185 | optarg = NULL; |
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186 | if (optind < argc) |
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187 | optarg = argv[optind]; |
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188 | return EOF; |
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189 | } |
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190 | |||
191 | next = argv[optind]; |
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192 | next++; // skip past - |
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193 | optind++; |
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194 | } |
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195 | |||
196 | //TCHAR c = *next++; |
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197 | //TCHAR *cp = _tcschr(optstring, c); |
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198 | char c = *next++; |
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199 | //char *cp = _tcschr(optstring, c); |
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200 | char *cp =strchr(optstring, c); |
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201 | |||
202 | if (cp == NULL || c == _T(':')) |
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203 | return _T('?'); |
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204 | |||
205 | cp++; |
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206 | if (*cp == _T(':')) |
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207 | { |
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208 | if (*next != _T('\0')) |
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209 | { |
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210 | optarg = next; |
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211 | next = NULL; |
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212 | } |
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213 | else if (optind < argc) |
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214 | { |
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215 | optarg = argv[optind]; |
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216 | optind++; |
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217 | } |
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218 | else |
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219 | { |
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220 | return _T('?'); |
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221 | } |
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222 | } |
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223 | |||
224 | return c; |
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225 | } |