Mercurial > hg > th-libs
annotate th_args.c @ 136:286b2249c5d2
Clean up th_args API.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Thu, 25 Sep 2014 03:18:27 +0300 |
parents | c22caa6e3fcb |
children | 0f43a94516f4 |
rev | line source |
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1 /* |
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2 * Simple commandline argument processing |
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3 * Programmed and designed by Matti 'ccr' Hamalainen |
128 | 4 * (C) Copyright 2002-2008 Tecnic Software productions (TNSP) |
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5 * |
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6 * Please read file 'COPYING' for information on license and distribution. |
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7 */ |
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8 /* |
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9 Description |
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10 =========== |
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11 Structures and functions for simple commandline argument processing, |
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12 option argument handling (short and long forms supported). |
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13 |
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14 Output function for printing out short on-line help for said options |
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15 and program commandline usage. |
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16 |
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17 |
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18 Format for typical commandline: |
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19 |
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20 $ program -a -b -c --long-d -e argument-for-e --long-f="argument for f" |
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21 |
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22 where -a, -b and -c are short options without required arguments; |
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23 --long-d is a long option without argument; -e is short option with |
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24 argument and finally --long-f is long option with argument. |
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25 |
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26 |
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27 Introduction |
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28 ============ |
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29 Handling of commandline options in th_args_process() has various |
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30 options, which effect how an option is handled. Also the error |
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31 situations (unknown option/no required argument) can be handled |
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32 in different ways. |
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33 |
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34 Typically th_args_process() is called as follows: |
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35 |
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36 BOOL optionHandlerCallback(int optionNumber, char *optionArgument, char *optionName) |
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37 { |
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38 if (option is OK) |
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39 return TRUE; |
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40 else |
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41 return FALSE; |
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42 } |
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43 |
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44 BOOL nonoptionHandlerCallback(char *argumentString) |
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45 { |
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46 // return value same as in optionHandlerCallback |
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47 } |
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48 |
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49 |
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50 int main(int argc, char *argv[]) |
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51 { |
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52 if (th_args_process(argc, argv, optList, optListN, |
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53 optionHandlerCallback, nonoptionHandlerCallback)) { |
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54 ... arguments OK ... |
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55 } else { |
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56 ... arguments invalid or required arguments missing ... |
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57 } |
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58 } |
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59 |
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60 |
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61 NOTICE! |
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62 ------- |
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63 The return value from handler callbacks affects the return value of |
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64 th_args_process(). Additionally, a failure in callback (returns FALSE) |
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65 effects the argument processing if bailOut argument of th_args_process() |
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66 is TRUE! |
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67 |
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68 If bailOut is TRUE, any error/failure in argument processing (including |
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69 callbacks) immediately stops the argument processing and FALSE is |
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70 returned from th_args_process(). |
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71 |
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72 If bailOut is FALSE, most errors are "ignored", but FALSE is still returned |
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73 if any errors occured. |
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74 |
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75 |
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76 NOTICE #2! |
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77 ---------- |
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78 A small temporary buffer of N*sizeof(BOOL) (where N is number of |
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79 options in optList[]) is allocated for processing required options. |
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80 If this allocation fails, the program is immediately exited with |
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81 code 128. |
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82 |
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83 |
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84 Examples |
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85 ======== |
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86 Example of different options, in a fictional optionlist struct: |
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87 |
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88 optarg_t optList[] = { |
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89 // Option without arguments |
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90 { 0, '?', "help", "Show this help", OPT_NONE }, |
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91 |
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92 // Option with a required argument |
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93 { 1, 'o', "output", "Output file name", OPT_ARGREQ }, |
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94 |
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95 // Option with only long form |
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96 { 0, 0, "only-long", "Long option", OPT_NONE }, |
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97 |
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98 // Option with only short form |
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99 { 0, 's', NULL, "Short option", OPT_NONE }, |
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100 |
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101 }; |
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102 |
2 | 103 const int optListN = (sizeof(optList) / sizeof(optarg_t)); |
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104 |
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105 |
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106 */ |
50 | 107 #ifndef TH_EXTERNAL |
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108 #include "th_util.h" |
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109 #include "th_args.h" |
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110 #include "th_string.h" |
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111 #endif |
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112 |
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113 |
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114 /* Check if option requires an argument |
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115 */ |
47 | 116 static BOOL th_args_check_arg(const optarg_t *o, const char *optArg) |
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117 { |
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118 if ((o->flags & OPT_ARGMASK) == OPT_ARGREQ && optArg == NULL) |
39 | 119 { |
120 if (o->optShort != 0 && o->optLong != NULL) | |
121 { | |
10 | 122 THERR("Option '-%c ARG' (--%s=ARG) requires an argument!\n", |
39 | 123 o->optShort, o->optLong); |
124 } | |
125 else if (o->optShort != 0) | |
126 { | |
10 | 127 THERR("Option '-%c ARG' requires an argument!\n", o->optShort); |
39 | 128 } |
129 else if (o->optLong != NULL) | |
130 { | |
10 | 131 THERR("Option --%s=ARG requires an argument!\n", o->optLong); |
132 } | |
39 | 133 |
10 | 134 return FALSE; |
39 | 135 } |
136 else | |
10 | 137 return TRUE; |
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138 } |
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139 |
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140 |
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141 /* Handle short options |
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142 */ |
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143 static BOOL th_args_process_short(char *currArg, int *newArgIndex, |
136 | 144 int argc, char *argv[], |
10 | 145 optarg_t optList[], int optListN, |
146 BOOL (*handleOpt)(int, char *, char *)) | |
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147 { |
10 | 148 char *tmpArg = currArg, *optArg; |
149 int optN; | |
150 BOOL isFound; | |
39 | 151 |
128 | 152 // Short options can be combined: -a -b -c == -abc |
39 | 153 while (*tmpArg) |
154 { | |
10 | 155 for (optN = 0, isFound = FALSE; (optN < optListN) && !isFound; optN++) |
39 | 156 if (*tmpArg == optList[optN].optShort) |
157 { | |
128 | 158 // Get possible option argument, if needed |
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159 if ((optList[optN].flags & OPT_ARGMASK) != 0 |
39 | 160 && (++(*newArgIndex) < argc)) |
161 optArg = argv[*newArgIndex]; | |
162 else | |
163 optArg = NULL; | |
164 | |
128 | 165 // Check if option argument is required |
39 | 166 if (!th_args_check_arg(&optList[optN], optArg)) |
167 return FALSE; | |
168 else | |
169 { | |
170 char tmpStr[2] = { 0, 0 }; | |
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171 |
128 | 172 // Option was given succesfully, try to handle it |
39 | 173 tmpStr[0] = *tmpArg; |
174 | |
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175 if (!handleOpt(optList[optN].id, optArg, tmpStr)) |
39 | 176 return FALSE; |
177 } | |
178 | |
179 isFound = TRUE; | |
10 | 180 } |
39 | 181 |
182 if (!isFound) | |
183 { | |
10 | 184 THERR("Unknown short option '%c' in argument '-%s'\n", |
39 | 185 *tmpArg, currArg); |
10 | 186 return FALSE; |
187 } | |
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188 |
10 | 189 tmpArg++; |
190 } | |
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191 |
10 | 192 return TRUE; |
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193 } |
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194 |
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195 |
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196 /* Handle long options |
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197 */ |
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198 static BOOL th_args_process_long(char *currArg, int *newArgIndex, |
136 | 199 int argc, char *argv[], |
10 | 200 optarg_t optList[], int optListN, |
201 BOOL (*handleOpt)(int, char *, char *)) | |
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202 { |
10 | 203 int optN, optLen, i; |
204 char *optArg; | |
39 | 205 |
206 (void) argc; | |
207 (void) argv; | |
208 (void) newArgIndex; | |
209 | |
128 | 210 // Long option |
211 for (optN = -1, optLen = i = 0; i < optListN && optN < 0; i++) | |
136 | 212 { |
213 optarg_t *opt = &optList[i]; | |
214 if (opt->optLong) | |
39 | 215 { |
136 | 216 optLen = strlen(opt->optLong); |
217 if (strncmp(currArg, opt->optLong, optLen) == 0) | |
39 | 218 optN = i; |
219 } | |
136 | 220 } |
39 | 221 |
128 | 222 // Get possible option argument, if needed |
39 | 223 if (optN >= 0) |
224 { | |
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225 if ((optList[optN].flags & OPT_ARGMASK) != 0) |
127
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226 optArg = (currArg[optLen] == '=') ? &currArg[optLen + 1] : NULL; |
39 | 227 else |
10 | 228 optArg = NULL; |
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229 |
128 | 230 // Check if option argument is required |
10 | 231 if (!th_args_check_arg(&optList[optN], optArg)) |
39 | 232 return FALSE; |
233 else | |
136 | 234 // Option was given succesfully, try to handle it |
235 if (!handleOpt(optList[optN].id, optArg, currArg)) | |
236 return FALSE; | |
39 | 237 } |
238 else | |
239 { | |
10 | 240 THERR("Unknown long option '--%s'\n", currArg); |
241 return FALSE; | |
242 } | |
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243 |
10 | 244 return TRUE; |
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245 } |
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246 |
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247 |
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248 /* Process arguments, handling short and long options by |
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249 * calling the given callback functions. |
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250 */ |
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251 BOOL th_args_process(int argc, char *argv[], |
39 | 252 optarg_t optList[], int optListN, |
253 BOOL(*handleOpt) (int, char *, char *), | |
254 BOOL(*handleNonOption) (char *), BOOL bailOut) | |
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255 { |
10 | 256 BOOL endOptions, optionsOK; |
136 | 257 int argIndex, newArgIndex; |
10 | 258 char *currArg; |
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259 |
128 | 260 // Parse arguments |
10 | 261 argIndex = 1; |
262 optionsOK = TRUE; | |
263 endOptions = FALSE; | |
39 | 264 while (argIndex < argc) |
265 { | |
10 | 266 currArg = argv[argIndex]; |
39 | 267 if ((currArg[0] == '-') && !endOptions) |
268 { | |
10 | 269 newArgIndex = argIndex; |
270 currArg++; | |
39 | 271 if (*currArg == '-') |
272 { | |
128 | 273 // Check for "--", which ends the options-list |
10 | 274 currArg++; |
39 | 275 if (*currArg == 0) |
276 { | |
10 | 277 endOptions = TRUE; |
278 continue; | |
279 } | |
39 | 280 |
128 | 281 // Long options |
10 | 282 if (!th_args_process_long(currArg, &newArgIndex, |
136 | 283 argc, argv, optList, |
39 | 284 optListN, handleOpt)) |
10 | 285 optionsOK = FALSE; |
39 | 286 } |
287 else | |
288 { | |
128 | 289 // Short options |
10 | 290 if (!th_args_process_short(currArg, &newArgIndex, |
136 | 291 argc, argv, optList, |
39 | 292 optListN, handleOpt)) |
10 | 293 optionsOK = FALSE; |
294 } | |
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295 |
10 | 296 argIndex = newArgIndex; |
39 | 297 } |
298 else | |
299 { | |
128 | 300 // Was not option argument |
39 | 301 if (handleNonOption == NULL |
302 || (handleNonOption != NULL && !handleNonOption(currArg))) | |
303 { | |
10 | 304 THERR("Invalid argument '%s'\n", currArg); |
305 optionsOK = FALSE; | |
306 } | |
307 } | |
39 | 308 |
128 | 309 // Check if we bail out on invalid argument |
39 | 310 if (!optionsOK && bailOut) |
10 | 311 return FALSE; |
39 | 312 |
10 | 313 argIndex++; |
314 } | |
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315 |
10 | 316 return optionsOK; |
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317 } |
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318 |
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319 |
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320 /* Print help for commandline arguments/options |
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321 */ |
50 | 322 void th_args_help(FILE *outFile, optarg_t optList[], int optListN) |
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323 { |
136 | 324 int index; |
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325 |
136 | 326 for (index = 0; index < optListN; index++) |
39 | 327 { |
136 | 328 optarg_t *opt = &optList[index]; |
39 | 329 |
128 | 330 // Print short option |
136 | 331 if (opt->optShort != 0) |
332 fprintf(outFile, " -%c, ", opt->optShort); | |
10 | 333 else |
334 fprintf(outFile, " "); | |
39 | 335 |
128 | 336 // Print long option |
136 | 337 if (opt->optLong) |
39 | 338 { |
10 | 339 char tmpStr[64], *p; |
39 | 340 |
136 | 341 if ((opt->flags & OPT_ARGMASK) == OPT_ARGREQ) |
39 | 342 { |
343 snprintf(tmpStr, sizeof(tmpStr), "%s=ARG", | |
136 | 344 opt->optLong); |
10 | 345 p = tmpStr; |
39 | 346 } |
347 else | |
136 | 348 p = opt->optLong; |
39 | 349 |
10 | 350 fprintf(outFile, "--%-15s", p); |
39 | 351 } |
352 else | |
10 | 353 fprintf(outFile, " "); |
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354 |
136 | 355 fprintf(outFile, " %s.\n", opt->desc); |
10 | 356 } |
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357 } |