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annotate src/XGetopt.c @ 307:db6db9a26a19
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| author | Carl Byington <carl@five-ten-sg.com> |
|---|---|
| date | Mon, 24 Dec 2012 16:26:39 -0800 |
| parents | fc11b1d1ad34 |
| children |
| rev | line source |
|---|---|
| 16 | 1 // XGetopt.cpp Version 1.1 |
| 2 // | |
| 3 // Author: Hans Dietrich | |
| 4 // hdietrich2@hotmail.com | |
| 5 // | |
| 6 // Modified: David Smith | |
| 7 // dave.s@earthcorp.com | |
| 8 // Moved two char declarations from body of function so | |
| 9 // that it can compile as a C function. | |
| 10 // Thanks so much Hans | |
| 11 // | |
| 12 // This software is released into the public domain. | |
| 13 // You are free to use it in any way you like. | |
| 14 // | |
| 15 // This software is provided "as is" with no expressed | |
| 16 // or implied warranty. I accept no liability for any | |
| 17 // damage or loss of business that this software may cause. | |
| 18 // | |
| 19 /////////////////////////////////////////////////////////////////////////////// | |
| 20 | |
|
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21 #ifndef __MINGW32__ /* mingw has getopt() */ |
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22 |
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23 #include "define.h" |
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24 |
| 16 | 25 |
| 26 /////////////////////////////////////////////////////////////////////////////// | |
| 27 // | |
| 28 // X G e t o p t . c p p | |
| 29 // | |
| 30 // | |
| 31 // NAME | |
| 32 // getopt -- parse command line options | |
| 33 // | |
| 34 // SYNOPSIS | |
|
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Carl Byington <carl@five-ten-sg.com>
parents:
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35 // int getopt(int argc, char* const* argv, const char *optstring) |
| 16 | 36 // |
| 37 // extern char *optarg; | |
| 38 // extern int optind; | |
| 39 // | |
| 40 // DESCRIPTION | |
| 41 // The getopt() function parses the command line arguments. Its | |
| 42 // arguments argc and argv are the argument count and array as | |
| 43 // passed into the application on program invocation. In the case | |
| 44 // of Visual C++ programs, argc and argv are available via the | |
| 45 // variables __argc and __argv (double underscores), respectively. | |
| 46 // getopt returns the next option letter in argv that matches a | |
| 47 // letter in optstring. | |
| 48 // | |
| 49 // optstring is a string of recognized option letters; if a letter | |
| 50 // is followed by a colon, the option is expected to have an argument | |
| 51 // that may or may not be separated from it by white space. optarg | |
| 52 // is set to point to the start of the option argument on return from | |
| 53 // getopt. | |
| 54 // | |
| 55 // Option letters may be combined, e.g., "-ab" is equivalent to | |
| 56 // "-a -b". Option letters are case sensitive. | |
| 57 // | |
| 58 // getopt places in the external variable optind the argv index | |
| 59 // of the next argument to be processed. optind is initialized | |
| 60 // to 0 before the first call to getopt. | |
| 61 // | |
| 62 // When all options have been processed (i.e., up to the first | |
| 63 // non-option argument), getopt returns EOF, optarg will point | |
| 64 // to the argument, and optind will be set to the argv index of | |
| 65 // the argument. If there are no non-option arguments, optarg | |
| 66 // will be set to NULL. | |
| 67 // | |
| 68 // The special option "--" may be used to delimit the end of the | |
| 69 // options; EOF will be returned, and "--" (and everything after it) | |
| 70 // will be skipped. | |
| 71 // | |
| 72 // RETURN VALUE | |
| 73 // For option letters contained in the string optstring, getopt | |
| 74 // will return the option letter. getopt returns a question mark (?) | |
| 75 // when it encounters an option letter not included in optstring. | |
| 76 // EOF is returned when processing is finished. | |
| 77 // | |
| 78 // BUGS | |
| 79 // 1) Long options are not supported. | |
| 80 // 2) The GNU double-colon extension is not supported. | |
| 81 // 3) The environment variable POSIXLY_CORRECT is not supported. | |
| 82 // 4) The + syntax is not supported. | |
| 83 // 5) The automatic permutation of arguments is not supported. | |
| 84 // 6) This implementation of getopt() returns EOF if an error is | |
| 85 // encountered, instead of -1 as the latest standard requires. | |
| 86 // | |
| 87 // EXAMPLE | |
| 88 // BOOL CMyApp::ProcessCommandLine(int argc, char *argv[]) | |
| 89 // { | |
| 90 // int c; | |
| 91 // | |
| 92 // while ((c = getopt(argc, argv, "aBn:")) != EOF) | |
| 93 // { | |
| 94 // switch (c) | |
| 95 // { | |
| 96 // case 'a': | |
| 97 // TRACE(_T("option a\n")); | |
| 98 // // | |
| 99 // // set some flag here | |
| 100 // // | |
| 101 // break; | |
| 102 // | |
| 103 // case 'B': | |
| 104 // TRACE( _T("option B\n")); | |
| 105 // // | |
| 106 // // set some other flag here | |
| 107 // // | |
| 108 // break; | |
| 109 // | |
| 110 // case 'n': | |
| 111 // TRACE(_T("option n: value=%d\n"), atoi(optarg)); | |
| 112 // // | |
| 113 // // do something with value here | |
| 114 // // | |
| 115 // break; | |
| 116 // | |
| 117 // case '?': | |
| 118 // TRACE(_T("ERROR: illegal option %s\n"), argv[optind-1]); | |
| 119 // return FALSE; | |
| 120 // break; | |
| 121 // | |
| 122 // default: | |
| 123 // TRACE(_T("WARNING: no handler for option %c\n"), c); | |
| 124 // return FALSE; | |
| 125 // break; | |
| 126 // } | |
| 127 // } | |
| 128 // // | |
| 129 // // check for non-option args here | |
| 130 // // | |
| 131 // return TRUE; | |
| 132 // } | |
| 133 // | |
| 134 /////////////////////////////////////////////////////////////////////////////// | |
| 135 | |
| 136 char *optarg; // global argument pointer | |
| 137 int optind = 0; // global argv index | |
| 138 | |
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118
0f1492b7fe8b
patch from Fridrich Strba for building on mingw and general cleanup of autoconf files
Carl Byington <carl@five-ten-sg.com>
parents:
16
diff
changeset
|
139 int getopt(int argc, char* const* argv, char *optstring) |
| 16 | 140 { |
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118
0f1492b7fe8b
patch from Fridrich Strba for building on mingw and general cleanup of autoconf files
Carl Byington <carl@five-ten-sg.com>
parents:
16
diff
changeset
|
141 static char *next = NULL; |
| 16 | 142 char c, *cp; |
| 143 if (optind == 0) | |
| 144 next = NULL; | |
| 145 | |
| 146 optarg = NULL; | |
| 147 | |
| 148 if (next == NULL || *next == '\0') | |
| 149 { | |
| 150 if (optind == 0) | |
| 151 optind++; | |
| 152 | |
| 153 if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0') | |
| 154 { | |
| 155 optarg = NULL; | |
| 156 if (optind < argc) | |
| 157 optarg = argv[optind]; | |
| 158 return EOF; | |
| 159 } | |
| 160 | |
| 161 if (strcmp(argv[optind], "--") == 0) | |
| 162 { | |
| 163 optind++; | |
| 164 optarg = NULL; | |
| 165 if (optind < argc) | |
| 166 optarg = argv[optind]; | |
| 167 return EOF; | |
| 168 } | |
| 169 | |
| 170 next = argv[optind]+1; | |
| 171 optind++; | |
| 172 } | |
| 173 | |
| 174 c = *next++; | |
| 175 cp = strchr(optstring, c); | |
| 176 | |
| 177 if (cp == NULL || c == ':') | |
| 178 return '?'; | |
| 179 | |
| 180 cp++; | |
| 181 if (*cp == ':') | |
| 182 { | |
| 183 if (*next != '\0') | |
| 184 { | |
| 185 optarg = next; | |
| 186 next = NULL; | |
| 187 } | |
| 188 else if (optind < argc) | |
| 189 { | |
| 190 optarg = argv[optind]; | |
| 191 optind++; | |
| 192 } | |
| 193 else | |
| 194 { | |
| 195 return '?'; | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 return c; | |
| 200 } | |
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118
0f1492b7fe8b
patch from Fridrich Strba for building on mingw and general cleanup of autoconf files
Carl Byington <carl@five-ten-sg.com>
parents:
16
diff
changeset
|
201 |
|
0f1492b7fe8b
patch from Fridrich Strba for building on mingw and general cleanup of autoconf files
Carl Byington <carl@five-ten-sg.com>
parents:
16
diff
changeset
|
202 #endif /* !__MINGW32__ */ |