1 | #include <stdlib.h>
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2 | #include <langinfo.h>
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3 | #include <time.h>
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4 | #include <ctype.h>
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5 | #include <stddef.h>
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6 | #include <string.h>
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7 | #include <strings.h>
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8 |
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9 | char *strptime(const char *restrict s, const char *restrict f, struct tm *restrict tm)
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10 | {
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11 | int i, w, neg, adj, min, range, *dest, dummy;
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12 | const char *ex;
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13 | size_t len;
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14 | int want_century = 0, century = 0, relyear = 0;
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15 | while (*f) {
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16 | if (*f != '%') {
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17 | if (isspace(*f)) for (; *s && isspace(*s); s++);
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18 | else if (*s != *f) return 0;
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19 | else s++;
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20 | f++;
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21 | continue;
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22 | }
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23 | f++;
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24 | if (*f == '+') f++;
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25 | if (isdigit(*f)) {
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26 | char *new_f;
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27 | w=strtoul(f, &new_f, 10);
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28 | f = new_f;
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29 | } else {
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30 | w=-1;
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31 | }
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32 | adj=0;
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33 | switch (*f++) {
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34 | case 'a': case 'A':
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35 | dest = &tm->tm_wday;
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36 | min = ABDAY_1;
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37 | range = 7;
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38 | goto symbolic_range;
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39 | case 'b': case 'B': case 'h':
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40 | dest = &tm->tm_mon;
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41 | min = ABMON_1;
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42 | range = 12;
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43 | goto symbolic_range;
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44 | case 'c':
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45 | s = strptime(s, nl_langinfo(D_T_FMT), tm);
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46 | if (!s) return 0;
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47 | break;
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48 | case 'C':
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49 | dest = ¢ury;
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50 | if (w<0) w=2;
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51 | want_century |= 2;
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52 | goto numeric_digits;
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53 | case 'd': case 'e':
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54 | dest = &tm->tm_mday;
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55 | min = 1;
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56 | range = 31;
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57 | goto numeric_range;
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58 | case 'D':
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59 | s = strptime(s, "%m/%d/%y", tm);
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60 | if (!s) return 0;
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61 | break;
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62 | case 'H':
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63 | dest = &tm->tm_hour;
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64 | min = 0;
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65 | range = 24;
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66 | goto numeric_range;
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67 | case 'I':
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68 | dest = &tm->tm_hour;
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69 | min = 1;
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70 | range = 12;
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71 | goto numeric_range;
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72 | case 'j':
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73 | dest = &tm->tm_yday;
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74 | min = 1;
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75 | range = 366;
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76 | adj = 1;
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77 | goto numeric_range;
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78 | case 'm':
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79 | dest = &tm->tm_mon;
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80 | min = 1;
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81 | range = 12;
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82 | adj = 1;
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83 | goto numeric_range;
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84 | case 'M':
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85 | dest = &tm->tm_min;
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86 | min = 0;
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87 | range = 60;
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88 | goto numeric_range;
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89 | case 'n': case 't':
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90 | for (; *s && isspace(*s); s++);
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91 | break;
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92 | case 'p':
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93 | ex = nl_langinfo(AM_STR);
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94 | len = strlen(ex);
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95 | if (!strncasecmp(s, ex, len)) {
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96 | tm->tm_hour %= 12;
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97 | s += len;
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98 | break;
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99 | }
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100 | ex = nl_langinfo(PM_STR);
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101 | len = strlen(ex);
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102 | if (!strncasecmp(s, ex, len)) {
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103 | tm->tm_hour %= 12;
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104 | tm->tm_hour += 12;
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105 | s += len;
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106 | break;
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107 | }
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108 | return 0;
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109 | case 'r':
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110 | s = strptime(s, nl_langinfo(T_FMT_AMPM), tm);
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111 | if (!s) return 0;
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112 | break;
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113 | case 'R':
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114 | s = strptime(s, "%H:%M", tm);
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115 | if (!s) return 0;
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116 | break;
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117 | case 'S':
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118 | dest = &tm->tm_sec;
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119 | min = 0;
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120 | range = 61;
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121 | goto numeric_range;
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122 | case 'T':
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123 | s = strptime(s, "%H:%M:%S", tm);
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124 | if (!s) return 0;
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125 | break;
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126 | case 'U':
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127 | case 'W':
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128 | /* Throw away result, for now. (FIXME?) */
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129 | dest = &dummy;
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130 | min = 0;
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131 | range = 54;
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132 | goto numeric_range;
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133 | case 'w':
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134 | dest = &tm->tm_wday;
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135 | min = 0;
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136 | range = 7;
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137 | goto numeric_range;
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138 | case 'x':
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139 | s = strptime(s, nl_langinfo(D_FMT), tm);
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140 | if (!s) return 0;
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141 | break;
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142 | case 'X':
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143 | s = strptime(s, nl_langinfo(T_FMT), tm);
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144 | if (!s) return 0;
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145 | break;
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146 | case 'y':
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147 | dest = &relyear;
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148 | w = 2;
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149 | want_century |= 1;
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150 | goto numeric_digits;
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151 | case 'Y':
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152 | dest = &tm->tm_year;
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153 | if (w<0) w=4;
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154 | adj = 1900;
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155 | want_century = 0;
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156 | goto numeric_digits;
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157 | case '%':
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158 | if (*s++ != '%') return 0;
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159 | break;
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160 | default:
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161 | return 0;
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162 | numeric_range:
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163 | if (!isdigit(*s)) return 0;
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164 | *dest = 0;
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165 | for (i=1; i<=min+range && isdigit(*s); i*=10)
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166 | *dest = *dest * 10 + *s++ - '0';
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167 | if (*dest - min >= (unsigned)range) return 0;
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168 | *dest -= adj;
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169 | switch((char *)dest - (char *)tm) {
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170 | case offsetof(struct tm, tm_yday):
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171 | ;
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172 | }
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173 | goto update;
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174 | numeric_digits:
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175 | neg = 0;
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176 | if (*s == '+') s++;
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177 | else if (*s == '-') neg=1, s++;
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178 | if (!isdigit(*s)) return 0;
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179 | for (*dest=i=0; i<w && isdigit(*s); i++)
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180 | *dest = *dest * 10 + *s++ - '0';
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181 | if (neg) *dest = -*dest;
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182 | *dest -= adj;
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183 | goto update;
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184 | symbolic_range:
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185 | for (i=2*range-1; i>=0; i--) {
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186 | ex = nl_langinfo(min+i);
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187 | len = strlen(ex);
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188 | if (strncasecmp(s, ex, len)) continue;
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189 | s += len;
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190 | *dest = i % range;
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191 | break;
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192 | }
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193 | if (i<0) return 0;
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194 | goto update;
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195 | update:
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196 | //FIXME
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197 | ;
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198 | }
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199 | }
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200 | if (want_century) {
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201 | tm->tm_year = relyear;
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202 | if (want_century & 2) tm->tm_year += century * 100 - 1900;
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203 | else if (tm->tm_year <= 68) tm->tm_year += 100;
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204 | }
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205 | return (char *)s;
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206 | }
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