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| 195 | 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 | } |