annotate tests/agcl/parsifal/date_p1.syn @ 20:bb115deb6fb2

Improve agfiles rule. (1) It didn't depend on $(AGCL) and it absolutely should have. (2) allow AGFORCE=1 to make it rebuild whether or not it looks out of date. (3) Document this.
author David A. Holland
date Mon, 13 Jun 2022 00:02:15 -0400
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1 {/*
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2 Date Translator
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3 Copyright (c) 1995-1999, Parsifal Software
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4 All Rights Reserved
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5 See the file COPYING for license and usage terms.
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6
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7 This program illustrates the use of AnaGram to translate a number of
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8 different representations of data into a common format. The example
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9 used shows how to translate any of a number of standard formats for
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10 entering a date into a single format for further processing.
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11
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12 The parser illustrated here recognizes six basic date formats, and
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13 for each, will supply the current year if the year is not given. If
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14 months are entered by name, they may be spelled out in full, or
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15 abbreviated in the customary manner. Text may be upper or lower case.
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16 Spaces or tabs may be used freely between the elements of the dates.
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17 Some examples of the six formats, as applied to the date June 26,
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18 1999, are as follows:
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19
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20 June 26 jun 26 June 26, 1999 JUN 26, 99 jun26,1999
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21 26 June 26 jun 26 June 1999 26 JUN 99 26jun99
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22 26-June 26-Jun 26-June-99 26-JUN-1999
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23 6/26 6/26/99 6/26/1999
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24 6-26 6-26-99 6-26-1999
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25 6.26 6.26.99 6-26.1999
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26 6/26/'99 6-26-'99 6.26.'99
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27 6/26 '99 6-26 '99 6.26 '99
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28 26/6 26/6/99 26/6/1999
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29 26-6 26-6-99 26-6-1999
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30 26.6 26.6.99 26.6.1999
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31 26/6 '99 26-6 '99 26.6 '99
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32 26 vi 26 vi 99 26 vi 1999 26 VI 99 26VI99
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33 26 vi '99
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34
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35 If CHKDATE encounters a date of the form 2/3/99, it interrogates a
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36 switch to determine whether to interpret this in the European manner
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37 (March 2, 1999) or the American manner (February 3, 1999). Where the
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38 form is obvious, as in 6/26/98 or 26/6/98 it ignores the switch.
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39
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40 CHKDATE also recognizes dates consisting of a month and year only.
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41 Where month and year cannot be distinguished from month and day,
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42 CHKDATE will assume month and day. When the year is given as a two
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43 digit number, 0 to 49 are assumed to refer to the coming 21st century
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44 and 50-99 are 20th century dates. To force recognition as month and
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45 year, use an apostrophe or use more than 2 digits for the year: Aug
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46 14 is the 14th of the month, Aug '14 is August 2014. For the
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47 beginning of WWI, use Aug 1914
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48
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49 CHKDATE operates on a string in memory and stores the month, day and
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50 year in the variables mon, day, and yr respectively.
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51
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52 checkDate() sets up the input pointer for CHKDATE and calls it.
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53 checkDate() then checks for error and adds 2000 to the year if the
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54 year specified was less than 50, otherwise it adds 1900 to the year
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55 if the year specified was less than 100. It returns non-zero in case
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56 of error and zero otherwise.
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57
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58 main() simply reads a string from stdin, and passes it to
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59 checkDate(). If there is no error, it prints the date in a standard
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60 format and loops forever.
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61
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62 */}
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63
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64 [
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65 pointer input // input string in memory
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66 ~case sensitive // ignore case
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67 disregard white space // skip blanks and tabs
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68 lexeme {month, roman, number} // except inside names and numbers
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69 ~diagnose errors // diagnostics not necessary
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70 parser name = chkdate
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71 ]
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72
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73
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74 eof = 0 // standard asciz string terminator
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75 white space = ' ' + '\t' // blanks and tabs
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76 punctuation = '-' + '/' + '.'
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77 letter = 'a-z'
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78
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79 i = 'i'
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80 v = 'v'
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81 x = 'x'
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82
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83 date string $
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84 -> date, eof
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85
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86 date
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87 // Feb 23, Feb 98
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88 -> month:m, number:d ={
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89 if (d > days[m] || d==0) day=0, yr=d; // (change to accommodate d = 0, made Dec. 11/99)
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90 else day=d, mon = m, yr = thisYear;
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91 }
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92
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93 // Feb '23
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94 -> month:m, '\'', number:y =day = 0, mon = m, yr = y;
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95 -> month:m, '/', number:y =day = 0, mon = m, yr = y; // Feb/99 (change made Dec. 11/99)
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96
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97 // Feb 17, 98
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98 -> month:m, number:d, ',', number:y =day = d, mon = m, yr = y;
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99 -> month:m, number:d, '/', number:y =day = d, mon = m, yr = y; // Feb 17/99 (change made Dec. 11/99)
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100
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101 // 18 Aug
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102 -> number:d, month =day = d, yr = thisYear;
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103
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104 // 18-Aug
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105 -> number:d, punct, month =day = d, yr = thisYear;
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106
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107 // 18 aug '95
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108 -> number:d, month, '\''?, number:y =day = d, yr = y;
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109 -> number:d, month, '/'?, number:y =day = d, yr = y; // 18 feb /95 (change made Dec. 11/99)
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110
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111
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112 // 18-aug 75 or //18-aug 1923
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113 -> number:d, punct, month,
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114 matchPunctuation, '\''?, number:y =day = d, yr = y;
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115
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116 // 6-11
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117 -> number:m, punct, number:d =monthDay(m,d);
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118
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119 // 6 '99 or 6-'99
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120 -> number:m, punct?, '\'', number:y =day = 0, mon=m, yr = y;
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121
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122 // 6-6-44 or 6-6-'44
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123 -> number:m, punct, number:d,
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124 matchPunctuation, '\''?, number:y =monthDayYear(m,d,y);
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125
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126 // 6-11'44
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127 -> number:m, punct, number:d,
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128 '\'', number:y =monthDayYear(m,d,y);
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129
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130 // 6 ix
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131 -> number:d, roman:m =mon = m, day = d, yr = thisYear;
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132
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133 // 6 ix 94
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134 -> number:d, roman:m, number:y =mon = m, day = d, yr = y;
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135
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136 // vi 44 or vi '44
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137 -> roman:m, '\''?, number:y =day = 0, mon = m, yr = y;
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138
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139 (int) month
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140 month
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141 -> "jan", letter?... =1;
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142 -> "feb", letter?... =2;
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143 -> "mar", letter?... =3;
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144 -> "apr", letter?... =4;
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145 -> "may" =5;
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146 -> "jun", letter?... =6;
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147 -> "jul", letter?... =7;
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148 -> "aug", letter?... =8;
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149 -> "sep", letter?... =9;
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150 -> "oct", letter?... =10;
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151 -> "nov", letter?... =11;
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152 -> "dec", letter?... =12;
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153
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154
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155 punct
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156 -> punctuation: c =matchChar = c;
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157
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158 matchPunctuation
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159 -> punctuation:c ={
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160 if (matchChar != c) PCB.exit_flag = AG_SYNTAX_ERROR_CODE;
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161 }
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162
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163 (int) number
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164 -> '0-9':d =d-'0';
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165 -> number:n, '0-9':d =10*n + d-'0';
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166
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167
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168 (int) roman
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169 -> i, x =9;
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170 -> i, v =4;
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171 -> units
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172
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173
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174 (int) units
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175 -> i =1;
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176 -> v =5;
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177 -> x =10;
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178 -> units:x, i =x+1;
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179
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180 {
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181
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182 #include <time.h>
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183
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184 #define SYNTAX_ERROR
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185
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186 int days[13] = {0,31,29,31,30,31,30,31,31,30,31,30,31};
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187 char *monthName[13] = {NULL, "January", "February", "March", "April",
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188 "May", "June", "July", "August", "September", "October",
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189 "November", "December"};
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190 int mon = 0, day = 0, yr = 0;
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191 int thisYear;
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192 int european = 0;
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193 int matchChar = 0;
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194
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195 void monthDay(int m, int d) {
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196 if (m <= 12 && d > days[m]) day=0, mon = m, yr = d;
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197 else if (m > 12 || european ) day = m, mon =d , yr = thisYear;
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198 else mon=m, day=d, yr=thisYear;
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199 }
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200
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201 void monthDayYear(int m, int d, int y) {
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202 if (m > 12 || european) day = m, mon = d;
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203 else mon = m, day = d;
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204 yr = y;
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205 }
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206
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207 int checkDate(char *input) {
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208 PCB.pointer = (unsigned char *) input;
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209 chkdate();
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210 if (PCB.exit_flag != AG_SUCCESS_CODE) return 1; /* fail on error */
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211 if (mon > 12) return 1;
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212 if (day > days[mon]) return 1;
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213 if (yr < 50) yr += 2000;
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214 else if (yr < 100 ) yr += 1900;
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215 return 0;
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216 }
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217
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218 int main(int argc, char *argv[]) {
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219 char input[82];
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220 time_t timeOfDay;
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221 int k;
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222
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223 for (k = 1; k < argc; k++) {
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224 switch (*argv[k]++) {
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225 case '/':
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226 case '-':
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227 if (*argv[k] == 'e') european = 1;
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228 break;
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229 }
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230 }
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231 /* Determine current year */
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232
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233 timeOfDay = time(NULL);
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234 thisYear = localtime(&timeOfDay)->tm_year;
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235
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236 /* Loop forever, reading input strings and converting them */
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237 while (1) {
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238 gets(input);
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239 if (feof(stdin)) break;
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240 if (checkDate(input)) printf("%-30s Bad date\n", input);
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241 else if (day) printf("%-30s %s %d, %d\n", input, monthName[mon], day, yr);
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242 else printf("%-30s %s %d\n", input, monthName[mon], yr);
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243 }
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244 return 0;
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245 }
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246 }