1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Calendar implementation for busybox
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4 | *
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5 | * See original copyright at the end of this file
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | /* BB_AUDIT SUSv3 compliant with -j and -y extensions (from util-linux). */
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11 | /* BB_AUDIT BUG: The output of 'cal -j 1752' is incorrect. The upstream
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12 | * BB_AUDIT BUG: version in util-linux seems to be broken as well. */
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13 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cal.html */
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14 |
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15 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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16 | *
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17 | * Major size reduction... over 50% (>1.5k) on i386.
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18 | */
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19 |
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20 | #include "libbb.h"
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21 |
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22 | /* We often use "unsigned" intead of "int", it's easier to div on most CPUs */
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23 |
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24 | #define THURSDAY 4 /* for reformation */
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25 | #define SATURDAY 6 /* 1 Jan 1 was a Saturday */
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26 |
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27 | #define FIRST_MISSING_DAY 639787 /* 3 Sep 1752 */
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28 | #define NUMBER_MISSING_DAYS 11 /* 11 day correction */
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29 |
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30 | #define MAXDAYS 42 /* max slots in a month array */
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31 | #define SPACE -1 /* used in day array */
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32 |
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33 | static const unsigned char days_in_month[] ALIGN1 = {
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34 | 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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35 | };
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36 |
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37 | static const unsigned char sep1752[] ALIGN1 = {
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38 | 1, 2, 14, 15, 16,
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39 | 17, 18, 19, 20, 21, 22, 23,
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40 | 24, 25, 26, 27, 28, 29, 30
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41 | };
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42 |
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43 | static unsigned julian;
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44 |
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45 | /* leap year -- account for Gregorian reformation in 1752 */
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46 | static int leap_year(unsigned yr)
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47 | {
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48 | if (yr <= 1752)
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49 | return !(yr % 4);
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50 | return (!(yr % 4) && (yr % 100)) || !(yr % 400);
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51 | }
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52 |
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53 | /* number of centuries since 1700, not inclusive */
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54 | #define centuries_since_1700(yr) \
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55 | ((yr) > 1700 ? (yr) / 100 - 17 : 0)
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56 |
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57 | /* number of centuries since 1700 whose modulo of 400 is 0 */
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58 | #define quad_centuries_since_1700(yr) \
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59 | ((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
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60 |
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61 | /* number of leap years between year 1 and this year, not inclusive */
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62 | #define leap_years_since_year_1(yr) \
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63 | ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
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64 |
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65 | static void center(char *, unsigned, unsigned);
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66 | static void day_array(unsigned, unsigned, unsigned *);
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67 | static void trim_trailing_spaces_and_print(char *);
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68 |
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69 | static void blank_string(char *buf, size_t buflen);
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70 | static char *build_row(char *p, unsigned *dp);
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71 |
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72 | #define DAY_LEN 3 /* 3 spaces per day */
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73 | #define J_DAY_LEN (DAY_LEN + 1)
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74 | #define WEEK_LEN 20 /* 7 * 3 - one space at the end */
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75 | #define J_WEEK_LEN (WEEK_LEN + 7)
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76 | #define HEAD_SEP 2 /* spaces between day headings */
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77 |
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78 | int cal_main(int argc, char **argv);
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79 | int cal_main(int argc, char **argv)
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80 | {
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81 | struct tm *local_time;
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82 | struct tm zero_tm;
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83 | time_t now;
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84 | unsigned month, year, flags, i;
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85 | char *month_names[12];
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86 | char day_headings[28]; /* 28 for julian, 21 for nonjulian */
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87 | char buf[40];
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88 |
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89 | flags = getopt32(argv, "jy");
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90 | julian = flags & 1;
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91 | month = 0;
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92 | argv += optind;
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93 | argc -= optind;
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94 |
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95 | if (argc > 2) {
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96 | bb_show_usage();
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97 | }
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98 |
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99 | if (!argc) {
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100 | time(&now);
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101 | local_time = localtime(&now);
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102 | year = local_time->tm_year + 1900;
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103 | if (!(flags & 2)) {
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104 | month = local_time->tm_mon + 1;
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105 | }
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106 | } else {
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107 | if (argc == 2) {
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108 | month = xatou_range(*argv++, 1, 12);
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109 | }
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110 | year = xatou_range(*argv, 1, 9999);
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111 | }
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112 |
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113 | blank_string(day_headings, sizeof(day_headings) - 7 + 7*julian);
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114 |
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115 | i = 0;
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116 | do {
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117 | zero_tm.tm_mon = i;
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118 | strftime(buf, sizeof(buf), "%B", &zero_tm);
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119 | month_names[i] = xstrdup(buf);
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120 |
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121 | if (i < 7) {
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122 | zero_tm.tm_wday = i;
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123 | strftime(buf, sizeof(buf), "%a", &zero_tm);
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124 | strncpy(day_headings + i * (3+julian) + julian, buf, 2);
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125 | }
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126 | } while (++i < 12);
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127 |
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128 | if (month) {
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129 | unsigned row, len, days[MAXDAYS];
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130 | unsigned *dp = days;
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131 | char lineout[30];
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132 |
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133 | day_array(month, year, dp);
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134 | len = sprintf(lineout, "%s %d", month_names[month - 1], year);
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135 | printf("%*s%s\n%s\n",
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136 | ((7*julian + WEEK_LEN) - len) / 2, "",
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137 | lineout, day_headings);
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138 | for (row = 0; row < 6; row++) {
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139 | build_row(lineout, dp)[0] = '\0';
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140 | dp += 7;
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141 | trim_trailing_spaces_and_print(lineout);
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142 | }
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143 | } else {
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144 | unsigned row, which_cal, week_len, days[12][MAXDAYS];
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145 | unsigned *dp;
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146 | char lineout[80];
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147 |
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148 | sprintf(lineout, "%d", year);
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149 | center(lineout,
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150 | (WEEK_LEN * 3 + HEAD_SEP * 2)
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151 | + julian * (J_WEEK_LEN * 2 + HEAD_SEP
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152 | - (WEEK_LEN * 3 + HEAD_SEP * 2)),
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153 | 0);
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154 | puts("\n"); /* two \n's */
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155 | for (i = 0; i < 12; i++) {
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156 | day_array(i + 1, year, days[i]);
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157 | }
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158 | blank_string(lineout, sizeof(lineout));
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159 | week_len = WEEK_LEN + julian * (J_WEEK_LEN - WEEK_LEN);
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160 | for (month = 0; month < 12; month += 3-julian) {
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161 | center(month_names[month], week_len, HEAD_SEP);
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162 | if (!julian) {
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163 | center(month_names[month + 1], week_len, HEAD_SEP);
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164 | }
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165 | center(month_names[month + 2 - julian], week_len, 0);
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166 | printf("\n%s%*s%s", day_headings, HEAD_SEP, "", day_headings);
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167 | if (!julian) {
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168 | printf("%*s%s", HEAD_SEP, "", day_headings);
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169 | }
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170 | putchar('\n');
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171 | for (row = 0; row < (6*7); row += 7) {
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172 | for (which_cal = 0; which_cal < 3-julian; which_cal++) {
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173 | dp = days[month + which_cal] + row;
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174 | build_row(lineout + which_cal * (week_len + 2), dp);
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175 | }
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176 | /* blank_string took care of nul termination. */
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177 | trim_trailing_spaces_and_print(lineout);
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178 | }
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179 | }
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180 | }
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181 |
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182 | fflush_stdout_and_exit(0);
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183 | }
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184 |
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185 | /*
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186 | * day_array --
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187 | * Fill in an array of 42 integers with a calendar. Assume for a moment
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188 | * that you took the (maximum) 6 rows in a calendar and stretched them
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189 | * out end to end. You would have 42 numbers or spaces. This routine
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190 | * builds that array for any month from Jan. 1 through Dec. 9999.
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191 | */
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192 | static void day_array(unsigned month, unsigned year, unsigned *days)
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193 | {
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194 | unsigned long temp;
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195 | unsigned i;
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196 | unsigned day, dw, dm;
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197 |
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198 | memset(days, SPACE, MAXDAYS * sizeof(int));
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199 |
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200 | if ((month == 9) && (year == 1752)) {
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201 | /* Assumes the Gregorian reformation eliminates
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202 | * 3 Sep. 1752 through 13 Sep. 1752.
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203 | */
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204 | unsigned j_offset = julian * 244;
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205 | size_t oday = 0;
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206 |
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207 | do {
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208 | days[oday+2] = sep1752[oday] + j_offset;
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209 | } while (++oday < sizeof(sep1752));
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210 |
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211 | return;
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212 | }
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213 |
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214 | /* day_in_year
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215 | * return the 1 based day number within the year
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216 | */
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217 | day = 1;
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218 | if ((month > 2) && leap_year(year)) {
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219 | ++day;
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220 | }
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221 |
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222 | i = month;
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223 | while (i) {
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224 | day += days_in_month[--i];
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225 | }
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226 |
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227 | /* day_in_week
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228 | * return the 0 based day number for any date from 1 Jan. 1 to
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229 | * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
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230 | * 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all
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231 | * missing days.
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232 | */
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233 | temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1) + day;
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234 | if (temp < FIRST_MISSING_DAY) {
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235 | dw = ((temp - 1 + SATURDAY) % 7);
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236 | } else {
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237 | dw = (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
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238 | }
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239 |
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240 | if (!julian) {
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241 | day = 1;
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242 | }
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243 |
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244 | dm = days_in_month[month];
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245 | if ((month == 2) && leap_year(year)) {
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246 | ++dm;
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247 | }
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248 |
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249 | do {
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250 | days[dw++] = day++;
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251 | } while (--dm);
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252 | }
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253 |
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254 | static void trim_trailing_spaces_and_print(char *s)
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255 | {
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256 | char *p = s;
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257 |
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258 | while (*p) {
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259 | ++p;
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260 | }
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261 | while (p != s) {
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262 | --p;
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263 | if (!(isspace)(*p)) { /* We want the function... not the inline. */
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264 | p[1] = '\0';
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265 | break;
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266 | }
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267 | }
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268 |
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269 | puts(s);
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270 | }
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271 |
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272 | static void center(char *str, unsigned len, unsigned separate)
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273 | {
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274 | unsigned n = strlen(str);
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275 | len -= n;
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276 | printf("%*s%*s", (len/2) + n, str, (len/2) + (len % 2) + separate, "");
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277 | }
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278 |
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279 | static void blank_string(char *buf, size_t buflen)
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280 | {
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281 | memset(buf, ' ', buflen);
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282 | buf[buflen-1] = '\0';
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283 | }
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284 |
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285 | static char *build_row(char *p, unsigned *dp)
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286 | {
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287 | unsigned col, val, day;
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288 |
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289 | memset(p, ' ', (julian + DAY_LEN) * 7);
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290 |
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291 | col = 0;
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292 | do {
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293 | day = *dp++;
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294 | if (day != SPACE) {
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295 | if (julian) {
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296 | ++p;
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297 | if (day >= 100) {
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298 | *p = '0';
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299 | p[-1] = (day / 100) + '0';
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300 | day %= 100;
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301 | }
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302 | }
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303 | val = day / 10;
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304 | if (val > 0) {
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305 | *p = val + '0';
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306 | }
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307 | *++p = day % 10 + '0';
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308 | p += 2;
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309 | } else {
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310 | p += DAY_LEN + julian;
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311 | }
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312 | } while (++col < 7);
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313 |
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314 | return p;
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315 | }
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316 |
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317 | /*
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318 | * Copyright (c) 1989, 1993, 1994
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319 | * The Regents of the University of California. All rights reserved.
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320 | *
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321 | * This code is derived from software contributed to Berkeley by
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322 | * Kim Letkeman.
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323 | *
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324 | * Redistribution and use in source and binary forms, with or without
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325 | * modification, are permitted provided that the following conditions
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326 | * are met:
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327 | * 1. Redistributions of source code must retain the above copyright
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328 | * notice, this list of conditions and the following disclaimer.
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329 | * 2. Redistributions in binary form must reproduce the above copyright
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330 | * notice, this list of conditions and the following disclaimer in the
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331 | * documentation and/or other materials provided with the distribution.
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332 | * 3. Neither the name of the University nor the names of its contributors
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333 | * may be used to endorse or promote products derived from this software
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334 | * without specific prior written permission.
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335 | *
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336 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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337 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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338 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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339 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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340 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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341 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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342 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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343 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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344 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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345 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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346 | * SUCH DAMAGE.
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347 | */
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