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annotate src/dmargs.c @ 2294:7f6ba3b32f54

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Cleanups.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 03 Jul 2019 10:28:43 +0300
parents bcdea45a14cb
children c801995cbb13
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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 2002-2018 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 /// @file
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9 /// @brief Simple commandline argument processing functions
0
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10 #include "dmargs.h"
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11
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12
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13 /**
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14 * Parse and optionally handle the given long or short option argument.
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15 * @param currArg current argument string
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16 * @param argIndex pointer to index of current argument in argv[]
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17 * @param argc number of arguments
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18 * @param argv argument string array
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19 * @param opts options list array
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20 * @param nopts number of elements in options list array
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21 * @param handle_option function pointer to callback that handles option arguments
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22 * @param doProcess if TRUE, actually handle the argument, aka call the handle_option() function. if FALSE, only validity of options are checked.
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23 * @param isLong TRUE if the option is a --long-format one
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24 */
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25 static BOOL dmArgsProcessOpt(
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26 char *currArg, int *argIndex,
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27 int argc, char *argv[],
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28 const DMOptArg opts[], int nopts,
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29 BOOL (*handle_option)(int id, char *, char *),
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30 BOOL doProcess, BOOL isLong)
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31 {
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32 const DMOptArg *opt = NULL;
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33 char *optArg = NULL;
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34 int optIndex;
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35
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36 for (optIndex = 0; optIndex < nopts; optIndex++)
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37 {
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38 const DMOptArg *node = &opts[optIndex];
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39 if (isLong && node->o_long != NULL)
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40 {
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41 if (strcmp(currArg, node->o_long) == 0)
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42 {
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43 opt = node;
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44 optArg = NULL;
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45 break;
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46 }
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47
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48 size_t len = strlen(node->o_long);
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49 if (strncmp(currArg, node->o_long, len) == 0 &&
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50 currArg[len] == '=')
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51 {
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52 opt = node;
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53 optArg = (&currArg[len+1] != 0) ? &currArg[len+1] : NULL;
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54 break;
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55 }
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56 }
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57 else
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58 if (!isLong && node->o_short != 0)
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59 {
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60 if (*currArg == node->o_short)
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61 {
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62 opt = node;
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63 optArg = (currArg[1] != 0) ? &currArg[1] : NULL;
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64 }
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65 }
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66 }
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67
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68 if (opt != NULL)
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69 {
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70 // Check for the possible option argument
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71 if ((opt->flags & OPT_ARGMASK) == OPT_ARGREQ && optArg == NULL)
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72 {
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73 if (*argIndex < argc)
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74 {
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75 (*argIndex)++;
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76 optArg = argv[*argIndex];
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77 }
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78
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79 if (optArg == NULL)
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80 {
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81 dmErrorMsg("Option '%s%s' requires an argument.\n",
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82 isLong ? "--" : "-",
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83 currArg);
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84 return FALSE;
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85 }
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86 }
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87
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88 // Option was given succesfully, try to process it
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89 if (doProcess && !handle_option(opt->id, optArg, currArg))
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90 return FALSE;
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91 }
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92 else
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93 {
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94 dmErrorMsg("Unknown %s option '%s%s'\n",
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95 isLong ? "long" : "short",
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96 isLong ? "--" : "-",
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97 currArg);
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98
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99 return FALSE;
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100 }
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101
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102 return TRUE;
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103 }
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104
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105
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106 /**
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107 * Process given array of commandline arguments, handling short
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108 * and long options by calling the respective callback functions.
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109 *
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110 * @param argc number of arguments
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111 * @param argv argument list
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112 * @param opts supported option list array
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113 * @param nopts number of elements in the option list array
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114 * @param handle_option callback function
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115 * @param handle_other callback function
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116 * @param flags processing flags
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117 * @return return TRUE if all is well
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118 */
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119 BOOL dmArgsProcess(int argc, char *argv[],
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120 const DMOptArg *opts, const int nopts,
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121 BOOL(*handle_option)(int id, char *, char *),
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122 BOOL(*handle_other)(char *), const int flags)
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123 {
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124 int argIndex, handleFlags = flags & OPTH_ONLY_MASK;
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125 BOOL optionsOK = TRUE, endOfOptions = FALSE;
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126
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127 for (argIndex = 1; argIndex < argc; argIndex++)
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128 {
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129 char *str = argv[argIndex];
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130 if (*str == '-' && !endOfOptions)
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131 {
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132 // Should we process options?
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133 BOOL doProcess = (handleFlags & OPTH_ONLY_OPTS) || handleFlags == 0;
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134 BOOL isLong;
0
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135
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136 str++;
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137 if (*str == '-')
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138 {
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139 // Check for "--", which ends the options-list
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140 str++;
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141 if (*str == 0)
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142 {
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143 endOfOptions = TRUE;
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144 continue;
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145 }
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146
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147 // We have a long option
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148 isLong = TRUE;
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149 }
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150 else
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151 isLong = FALSE;
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152
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153 if (!dmArgsProcessOpt(str, &argIndex, argc, argv,
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154 opts, nopts, handle_option, doProcess, isLong))
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155 optionsOK = FALSE;
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156 }
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157 else
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158 if (handleFlags == OPTH_ONLY_OTHER || handleFlags == 0)
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159 {
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160 // Was not option argument
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161 if (handle_other == NULL ||
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162 (handle_other != NULL && !handle_other(str)))
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163 {
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164 dmErrorMsg("Invalid argument '%s'\n", str);
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165 optionsOK = FALSE;
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166 }
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167 }
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168
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169 // Check if we bail out on invalid argument
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170 if (!optionsOK && (flags & OPTH_BAILOUT))
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171 return FALSE;
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172 }
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173
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174 return optionsOK;
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175 }
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176
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177
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178 static void dmPad(FILE *outFile, int count)
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179 {
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180 while (count--)
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181 fputc(' ', outFile);
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182 }
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183
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184
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185 static void dmPrintWrap(FILE *fh, const char *str, int spad, int rpad, int width)
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186 {
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187 size_t pos = 0;
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188 BOOL first = TRUE;
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189
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190 while (str[pos])
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191 {
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192 // Pre-pad line
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193 int linelen = first ? spad : rpad;
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194 dmPad(fh, first ? 0 : rpad);
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195 first = FALSE;
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196
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197 // Skip whitespace at line start
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198 while (isspace(str[pos]) || str[pos] == '\n') pos++;
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199
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200 // Handle each word
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201 while (str[pos] && str[pos] != '\n')
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202 {
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203 size_t next;
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204 int wlen;
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205 for (wlen = 0, next = pos; str[next] && !isspace(str[next]) && str[next] != '\n'; next++, wlen++);
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206 // fprintf(stdout, "X '%c', %d .. linelen=%d/%d, wlen=%d\n", str[pos], pos, linelen, width, wlen);
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207 if (linelen + wlen < width)
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208 {
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209 for (;pos < next; pos++, linelen++)
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210 fputc(str[pos], fh);
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211
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212 if (str[next] == '\n' || str[next] == 0)
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213 {
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214 fprintf(fh, "\n");
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215 break;
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216 }
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217 else
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218 {
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219 fputc(str[pos], fh);
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220 pos++;
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221 linelen++;
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222 }
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223 }
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224 else
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225 {
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226 fprintf(fh, "\n");
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227 break;
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228 }
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229 }
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230 }
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231 }
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232
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233
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234 /**
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235 * Print help for commandline arguments/options
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236 * @param fh stdio file handle to output to
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237 * @param opts options list array
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238 * @param nopts number of elements in options list array
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239 * @param flags flags (currently unused)
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240 */
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241 void dmArgsPrintHelp(FILE *fh,
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242 const DMOptArg *opts, const int nopts,
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243 const int flags)
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244 {
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245 int index;
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246 (void) flags;
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247
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248 // Print out option list
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249 for (index = 0; index < nopts; index++)
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250 {
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251 const DMOptArg *opt = &opts[index];
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252 char tmpStr[128];
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253
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254 // Print short option
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255 if (opt->o_short != 0)
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256 {
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257 snprintf(tmpStr, sizeof(tmpStr),
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258 "-%c,", opt->o_short);
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259 }
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260 else
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261 tmpStr[0] = 0;
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262
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263 fprintf(fh, " %-5s", tmpStr);
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264
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265 // Print long option
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266 if (opt->o_long != NULL)
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267 {
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268 snprintf(tmpStr, sizeof(tmpStr), "--%s%s",
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269 opt->o_long,
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270 (opt->flags & OPT_ARGREQ) ? "=ARG" : "");
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271 }
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272 else
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273 tmpStr[0] = 0;
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274
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275 fprintf(fh, "%-18s", tmpStr);
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276
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277 dmPrintWrap(fh, opt->desc, 24, 24, 79);
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278 }
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279 }