Mercurial > hg > th-libs
annotate th_args.c @ 10:a25f5d22483e
Updates.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Mon, 20 Apr 2009 00:01:43 +0300 |
parents | efaa9e3a8446 |
children | 0d55592e0e01 |
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 |
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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 optional argument |
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96 { 2, 'f', "foobar", "Use foobar, with optional string", OPT_ARGOPT }, |
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97 |
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98 // This option is required to be given, though without other flags |
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99 // it may not make much sense. |
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100 { 4, 'S', "stupid", "You must give this option", OPT_REQUIRED }, |
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101 |
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102 // The flags can be combined with OR operator: this option is both |
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103 // required to be specified, and also requires argument (the filename) |
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104 { 5, 'i', "input", "Input file name", OPT_REQUIRED | OPT_ARGREQ }, |
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105 |
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106 |
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107 // Option with only long form |
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108 { 0, 0, "only-long", "Long option", OPT_NONE }, |
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109 |
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110 // Option with only short form |
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111 { 0, 's', NULL, "Short option", OPT_NONE }, |
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112 |
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113 }; |
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114 |
2 | 115 const int optListN = (sizeof(optList) / sizeof(optarg_t)); |
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116 |
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117 |
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118 */ |
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119 #ifdef HAVE_CONFIG_H |
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120 #include "config.h" |
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121 #endif |
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122 #include "th_util.h" |
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123 #include "th_args.h" |
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124 #include "th_string.h" |
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125 |
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126 |
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127 /* Check if option requires an argument |
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128 */ |
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129 static BOOL th_args_check_arg(optarg_t *o, char *optArg) |
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130 { |
10 | 131 if ((o->optFlags & OPT_ARGMASK) == OPT_ARGREQ && optArg == NULL) { |
132 if (o->optShort != 0 && o->optLong != NULL) { | |
133 THERR("Option '-%c ARG' (--%s=ARG) requires an argument!\n", | |
134 o->optShort, o->optLong); | |
135 } else if (o->optShort != 0) { | |
136 THERR("Option '-%c ARG' requires an argument!\n", o->optShort); | |
137 } else if (o->optLong != NULL) { | |
138 THERR("Option --%s=ARG requires an argument!\n", o->optLong); | |
139 } | |
140 | |
141 return FALSE; | |
142 } else | |
143 return TRUE; | |
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144 |
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145 } |
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146 |
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147 |
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148 /* Handle short options |
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149 */ |
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150 static BOOL th_args_process_short(char *currArg, int *newArgIndex, |
10 | 151 BOOL *wasGiven, int argc, char *argv[], |
152 optarg_t optList[], int optListN, | |
153 BOOL (*handleOpt)(int, char *, char *)) | |
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154 { |
10 | 155 char *tmpArg = currArg, *optArg; |
156 int optN; | |
157 BOOL isFound; | |
158 | |
159 /* Short options can be combined: -a -b -c == -abc */ | |
160 while (*tmpArg) { | |
161 | |
162 for (optN = 0, isFound = FALSE; (optN < optListN) && !isFound; optN++) | |
163 if (*tmpArg == optList[optN].optShort) { | |
164 /* Get possible option argument, if needed */ | |
165 if ((optList[optN].optFlags & OPT_ARGMASK) != 0 && (++(*newArgIndex) < argc)) | |
166 optArg = argv[*newArgIndex]; | |
167 else | |
168 optArg = NULL; | |
169 | |
170 /* Check if option argument is required */ | |
171 if (!th_args_check_arg(&optList[optN], optArg)) | |
172 return FALSE; | |
173 else { | |
174 char tmpStr[2] = { 0, 0 }; | |
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175 |
10 | 176 /* Option was given succesfully, try to handle it */ |
177 wasGiven[optN] = TRUE; | |
178 | |
179 tmpStr[0] = *tmpArg; | |
180 | |
181 if (!handleOpt(optList[optN].optID, optArg, tmpStr)) | |
182 return FALSE; | |
183 } | |
184 | |
185 isFound = TRUE; | |
186 } | |
187 | |
188 if (!isFound) { | |
189 THERR("Unknown short option '%c' in argument '-%s'\n", | |
190 *tmpArg, currArg); | |
191 return FALSE; | |
192 } | |
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193 |
10 | 194 tmpArg++; |
195 } | |
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196 |
10 | 197 return TRUE; |
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198 } |
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199 |
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200 |
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201 /* Handle long options |
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202 */ |
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203 static BOOL th_args_process_long(char *currArg, int *newArgIndex, |
10 | 204 BOOL *wasGiven, int argc, char *argv[], |
205 optarg_t optList[], int optListN, | |
206 BOOL (*handleOpt)(int, char *, char *)) | |
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207 { |
10 | 208 int optN, optLen, i; |
209 char *optArg; | |
210 | |
211 (void) argc; (void) argv; (void) newArgIndex; | |
212 | |
213 /* Long option */ | |
214 for (optN = -1, optLen = i = 0; (i < optListN) && (optN < 0); i++) | |
215 if (optList[i].optLong) { | |
216 optLen = strlen(optList[i].optLong); | |
217 if (strncmp(currArg, optList[i].optLong, optLen) == 0) | |
218 optN = i; | |
219 } | |
220 | |
221 /* Get possible option argument, if needed */ | |
222 if (optN >= 0) { | |
223 if ((optList[optN].optFlags & OPT_ARGMASK) != 0) { | |
224 if (currArg[optLen] == '=') | |
225 optArg = &currArg[optLen + 1]; | |
226 else | |
227 optArg = NULL; | |
228 } else | |
229 optArg = NULL; | |
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230 |
10 | 231 /* Check if option argument is required */ |
232 if (!th_args_check_arg(&optList[optN], optArg)) | |
233 return FALSE; | |
234 else { | |
235 /* Option was given succesfully, try to handle it */ | |
236 wasGiven[optN] = TRUE; | |
237 if (!handleOpt(optList[optN].optID, optArg, currArg)) | |
238 return FALSE; | |
239 } | |
240 } else { | |
241 THERR("Unknown long option '--%s'\n", currArg); | |
242 return FALSE; | |
243 } | |
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244 |
10 | 245 return TRUE; |
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246 } |
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247 |
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248 |
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249 /* Process arguments, handling short and long options by |
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250 * calling the given callback functions. |
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251 */ |
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252 BOOL th_args_process(int argc, char *argv[], |
10 | 253 optarg_t optList[], int optListN, |
254 BOOL (*handleOpt) (int, char *, char *), | |
255 BOOL (*handleNonOption) (char *), BOOL bailOut) | |
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256 { |
10 | 257 BOOL endOptions, optionsOK; |
258 int argIndex, newArgIndex, i; | |
259 char *currArg; | |
260 BOOL *wasGiven; | |
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261 |
10 | 262 /* Allocate wasGiven */ |
263 wasGiven = (BOOL *) th_calloc(optListN, sizeof(BOOL)); | |
264 if (!wasGiven) { | |
265 THERR("FATAL ERROR! Could not allocate wasGiven in th_args_process()!\n"); | |
266 exit(128); | |
267 } | |
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268 |
10 | 269 /* Parse arguments */ |
270 argIndex = 1; | |
271 optionsOK = TRUE; | |
272 endOptions = FALSE; | |
273 while (argIndex < argc) { | |
274 currArg = argv[argIndex]; | |
275 if ((currArg[0] == '-') && !endOptions) { | |
276 newArgIndex = argIndex; | |
277 currArg++; | |
278 if (*currArg == '-') { | |
279 /* Check for "--", which ends the options-list */ | |
280 currArg++; | |
281 if (*currArg == 0) { | |
282 endOptions = TRUE; | |
283 continue; | |
284 } | |
285 | |
286 /* Long options */ | |
287 if (!th_args_process_long(currArg, &newArgIndex, | |
288 wasGiven, argc, argv, optList, optListN, | |
289 handleOpt)) | |
290 optionsOK = FALSE; | |
291 } else { | |
292 /* Short options */ | |
293 if (!th_args_process_short(currArg, &newArgIndex, | |
294 wasGiven, argc, argv, optList, optListN, | |
295 handleOpt)) | |
296 optionsOK = FALSE; | |
297 } | |
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298 |
10 | 299 argIndex = newArgIndex; |
300 } else { | |
301 /* Was not option argument */ | |
302 if (handleNonOption == NULL || (handleNonOption != NULL && !handleNonOption(currArg))) { | |
303 THERR("Invalid argument '%s'\n", currArg); | |
304 optionsOK = FALSE; | |
305 } | |
306 } | |
307 | |
308 /* Check if we bail out on invalid argument */ | |
309 if (!optionsOK && bailOut) { | |
310 th_free(wasGiven); | |
311 return FALSE; | |
312 } | |
313 | |
314 argIndex++; | |
315 } | |
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316 |
10 | 317 /* Check wasGiven by isRequired */ |
318 for (i = 0; i < optListN; i++) | |
319 if ((optList[i].optFlags & OPT_REQUIRED) != 0 && !wasGiven[i]) { | |
320 THERR("Option -%s (--%s) is required.\n", | |
321 optList[i].optShort, optList[i].optLong); | |
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322 |
10 | 323 optionsOK = FALSE; |
324 if (bailOut) break; | |
325 } | |
326 | |
327 th_free(wasGiven); | |
328 return optionsOK; | |
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329 } |
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330 |
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331 |
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332 /* Print help for commandline arguments/options |
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333 */ |
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334 void th_args_help(FILE * outFile, |
10 | 335 optarg_t optList[], int optListN, |
336 char * progName, char * progUsage) | |
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337 { |
10 | 338 int i, nrequired; |
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339 |
10 | 340 fprintf(outFile, |
341 "\n%s v%s (%s)\n" | |
342 "%s\n" | |
343 "%s\n" | |
344 "Usage: %s %s\n", | |
345 th_prog_name, th_prog_version, th_prog_fullname, | |
346 th_prog_author, th_prog_license, progName, progUsage); | |
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347 |
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348 |
10 | 349 for (i = nrequired = 0; i < optListN; i++) { |
350 optarg_t *o = &optList[i]; | |
351 | |
352 /* Print short option */ | |
353 if (o->optShort != 0) | |
354 fprintf(outFile, " -%c, ", o->optShort); | |
355 else | |
356 fprintf(outFile, " "); | |
357 | |
358 /* Print long option */ | |
359 if (o->optLong) { | |
360 char tmpStr[64], *p; | |
361 | |
362 if ((o->optFlags & OPT_ARGMASK) == OPT_ARGOPT) { | |
363 snprintf(tmpStr, sizeof(tmpStr), "%s[=ARG]", optList[i].optLong); | |
364 p = tmpStr; | |
365 } else if ((o->optFlags & OPT_ARGMASK) == OPT_ARGREQ) { | |
366 snprintf(tmpStr, sizeof(tmpStr), "%s=ARG", optList[i].optLong); | |
367 p = tmpStr; | |
368 } else | |
369 p = o->optLong; | |
370 | |
371 fprintf(outFile, "--%-15s", p); | |
372 } else | |
373 fprintf(outFile, " "); | |
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374 |
10 | 375 fprintf(outFile, " %s.", optList[i].optDesc); |
376 | |
377 if (o->optFlags & OPT_REQUIRED) { | |
378 fprintf(outFile, " [*]\n"); | |
379 nrequired++; | |
380 } else | |
381 fprintf(outFile, "\n"); | |
382 } | |
383 | |
384 if (nrequired > 0) | |
385 fprintf(outFile, "(Options marked with [*] are required)\n"); | |
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386 } |
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387 |