1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 2007 Denys Vlasenko
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 | #include "libbb.h"
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10 |
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11 | void FAST_FUNC parse_datestr(const char *date_str, struct tm *ptm)
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12 | {
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13 | char end = '\0';
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14 | const char *last_colon = strrchr(date_str, ':');
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15 |
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16 | if (last_colon != NULL) {
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17 | /* Parse input and assign appropriately to ptm */
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18 | #if ENABLE_DESKTOP
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19 | const char *endp;
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20 | #endif
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21 |
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22 | /* HH:MM */
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23 | if (sscanf(date_str, "%u:%u%c",
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24 | &ptm->tm_hour,
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25 | &ptm->tm_min,
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26 | &end) >= 2
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27 | ) {
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28 | /* no adjustments needed */
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29 | } else
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30 | /* mm.dd-HH:MM */
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31 | if (sscanf(date_str, "%u.%u-%u:%u%c",
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32 | &ptm->tm_mon, &ptm->tm_mday,
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33 | &ptm->tm_hour, &ptm->tm_min,
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34 | &end) >= 4
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35 | ) {
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36 | /* Adjust month from 1-12 to 0-11 */
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37 | ptm->tm_mon -= 1;
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38 | } else
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39 | /* yyyy.mm.dd-HH:MM */
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40 | if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &ptm->tm_year,
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41 | &ptm->tm_mon, &ptm->tm_mday,
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42 | &ptm->tm_hour, &ptm->tm_min,
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43 | &end) >= 5
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44 | /* yyyy-mm-dd HH:MM */
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45 | || sscanf(date_str, "%u-%u-%u %u:%u%c", &ptm->tm_year,
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46 | &ptm->tm_mon, &ptm->tm_mday,
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47 | &ptm->tm_hour, &ptm->tm_min,
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48 | &end) >= 5
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49 | ) {
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50 | ptm->tm_year -= 1900; /* Adjust years */
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51 | ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
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52 | } else
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53 | #if ENABLE_DESKTOP /* strptime is BIG: ~1k in uclibc, ~10k in glibc */
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54 | /* month_name d HH:MM:SS YYYY. Supported by GNU date */
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55 | if ((endp = strptime(date_str, "%b %d %T %Y", ptm)) != NULL
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56 | && *endp == '\0'
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57 | ) {
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58 | return; /* don't fall through to end == ":" check */
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59 | } else
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60 | #endif
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61 | {
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62 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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63 | }
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64 | if (end == ':') {
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65 | /* xxx:SS */
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66 | if (sscanf(last_colon + 1, "%u%c", &ptm->tm_sec, &end) == 1)
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67 | end = '\0';
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68 | /* else end != NUL and we error out */
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69 | }
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70 | } else
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71 | if (strchr(date_str, '-')
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72 | /* Why strchr('-') check?
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73 | * sscanf below will trash ptm->tm_year, this breaks
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74 | * if parse_str is "10101010" (iow, "MMddhhmm" form)
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75 | * because we destroy year. Do these sscanf
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76 | * only if we saw a dash in parse_str.
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77 | */
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78 | /* yyyy-mm-dd HH */
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79 | && (sscanf(date_str, "%u-%u-%u %u%c", &ptm->tm_year,
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80 | &ptm->tm_mon, &ptm->tm_mday,
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81 | &ptm->tm_hour,
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82 | &end) >= 4
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83 | /* yyyy-mm-dd */
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84 | || sscanf(date_str, "%u-%u-%u%c", &ptm->tm_year,
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85 | &ptm->tm_mon, &ptm->tm_mday,
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86 | &end) >= 3
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87 | )
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88 | ) {
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89 | ptm->tm_year -= 1900; /* Adjust years */
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90 | ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
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91 | } else
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92 | if (date_str[0] == '@') {
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93 | time_t t = bb_strtol(date_str + 1, NULL, 10);
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94 | if (!errno) {
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95 | struct tm *lt = localtime(&t);
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96 | if (lt) {
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97 | *ptm = *lt;
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98 | return;
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99 | }
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100 | }
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101 | end = '1';
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102 | } else {
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103 | /* Googled the following on an old date manpage:
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104 | *
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105 | * The canonical representation for setting the date/time is:
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106 | * cc Century (either 19 or 20)
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107 | * yy Year in abbreviated form (e.g. 89, 06)
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108 | * mm Numeric month, a number from 1 to 12
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109 | * dd Day, a number from 1 to 31
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110 | * HH Hour, a number from 0 to 23
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111 | * MM Minutes, a number from 0 to 59
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112 | * .SS Seconds, a number from 0 to 61 (with leap seconds)
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113 | * Everything but the minutes is optional
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114 | *
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115 | * "touch -t DATETIME" format: [[[[[YY]YY]MM]DD]hh]mm[.ss]
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116 | * Some, but not all, Unix "date DATETIME" commands
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117 | * move [[YY]YY] past minutes mm field (!).
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118 | * Coreutils date does it, and SUS mandates it.
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119 | * (date -s DATETIME does not support this format. lovely!)
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120 | * In bbox, this format is special-cased in date applet
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121 | * (IOW: this function assumes "touch -t" format).
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122 | */
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123 | unsigned cur_year = ptm->tm_year;
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124 | int len = strchrnul(date_str, '.') - date_str;
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125 |
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126 | /* MM[.SS] */
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127 | if (len == 2 && sscanf(date_str, "%2u%2u%2u%2u""%2u%c" + 12,
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128 | &ptm->tm_min,
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129 | &end) >= 1) {
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130 | } else
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131 | /* HHMM[.SS] */
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132 | if (len == 4 && sscanf(date_str, "%2u%2u%2u""%2u%2u%c" + 9,
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133 | &ptm->tm_hour,
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134 | &ptm->tm_min,
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135 | &end) >= 2) {
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136 | } else
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137 | /* ddHHMM[.SS] */
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138 | if (len == 6 && sscanf(date_str, "%2u%2u""%2u%2u%2u%c" + 6,
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139 | &ptm->tm_mday,
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140 | &ptm->tm_hour,
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141 | &ptm->tm_min,
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142 | &end) >= 3) {
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143 | } else
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144 | /* mmddHHMM[.SS] */
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145 | if (len == 8 && sscanf(date_str, "%2u""%2u%2u%2u%2u%c" + 3,
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146 | &ptm->tm_mon,
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147 | &ptm->tm_mday,
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148 | &ptm->tm_hour,
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149 | &ptm->tm_min,
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150 | &end) >= 4) {
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151 | /* Adjust month from 1-12 to 0-11 */
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152 | ptm->tm_mon -= 1;
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153 | } else
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154 | /* yymmddHHMM[.SS] */
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155 | if (len == 10 && sscanf(date_str, "%2u%2u%2u%2u%2u%c",
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156 | &ptm->tm_year,
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157 | &ptm->tm_mon,
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158 | &ptm->tm_mday,
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159 | &ptm->tm_hour,
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160 | &ptm->tm_min,
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161 | &end) >= 5) {
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162 | /* Adjust month from 1-12 to 0-11 */
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163 | ptm->tm_mon -= 1;
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164 | if ((int)cur_year >= 50) { /* >= 1950 */
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165 | /* Adjust year: */
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166 | /* 1. Put it in the current century */
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167 | ptm->tm_year += (cur_year / 100) * 100;
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168 | /* 2. If too far in the past, +100 years */
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169 | if (ptm->tm_year < cur_year - 50)
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170 | ptm->tm_year += 100;
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171 | /* 3. If too far in the future, -100 years */
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172 | if (ptm->tm_year > cur_year + 50)
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173 | ptm->tm_year -= 100;
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174 | }
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175 | } else
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176 | /* ccyymmddHHMM[.SS] */
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177 | if (len == 12 && sscanf(date_str, "%4u%2u%2u%2u%2u%c",
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178 | &ptm->tm_year,
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179 | &ptm->tm_mon,
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180 | &ptm->tm_mday,
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181 | &ptm->tm_hour,
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182 | &ptm->tm_min,
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183 | &end) >= 5) {
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184 | ptm->tm_year -= 1900; /* Adjust years */
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185 | ptm->tm_mon -= 1; /* Adjust month from 1-12 to 0-11 */
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186 | } else {
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187 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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188 | }
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189 | ptm->tm_sec = 0; /* assume zero if [.SS] is not given */
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190 | if (end == '.') {
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191 | /* xxx.SS */
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192 | if (sscanf(strchr(date_str, '.') + 1, "%u%c",
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193 | &ptm->tm_sec, &end) == 1)
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194 | end = '\0';
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195 | /* else end != NUL and we error out */
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196 | }
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197 | }
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198 | if (end != '\0') {
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199 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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200 | }
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201 | }
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202 |
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203 | time_t FAST_FUNC validate_tm_time(const char *date_str, struct tm *ptm)
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204 | {
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205 | time_t t = mktime(ptm);
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206 | if (t == (time_t) -1L) {
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207 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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208 | }
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209 | return t;
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210 | }
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211 |
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212 | static char* strftime_fmt(char *buf, unsigned len, time_t *tp, const char *fmt)
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213 | {
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214 | time_t t;
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215 | if (!tp) {
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216 | tp = &t;
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217 | time(tp);
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218 | }
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219 | /* Returns pointer to NUL */
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220 | return buf + strftime(buf, len, fmt, localtime(tp));
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221 | }
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222 |
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223 | char* FAST_FUNC strftime_HHMMSS(char *buf, unsigned len, time_t *tp)
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224 | {
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225 | return strftime_fmt(buf, len, tp, "%H:%M:%S");
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226 | }
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227 |
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228 | char* FAST_FUNC strftime_YYYYMMDDHHMMSS(char *buf, unsigned len, time_t *tp)
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229 | {
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230 | return strftime_fmt(buf, len, tp, "%Y-%m-%d %H:%M:%S");
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231 | }
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232 |
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233 | #if ENABLE_MONOTONIC_SYSCALL
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234 |
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235 | #include <sys/syscall.h>
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236 | /* Old glibc (< 2.3.4) does not provide this constant. We use syscall
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237 | * directly so this definition is safe. */
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238 | #ifndef CLOCK_MONOTONIC
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239 | #define CLOCK_MONOTONIC 1
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240 | #endif
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241 |
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242 | /* libc has incredibly messy way of doing this,
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243 | * typically requiring -lrt. We just skip all this mess */
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244 | static void get_mono(struct timespec *ts)
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245 | {
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246 | if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, ts))
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247 | bb_error_msg_and_die("clock_gettime(MONOTONIC) failed");
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248 | }
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249 | unsigned long long FAST_FUNC monotonic_ns(void)
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250 | {
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251 | struct timespec ts;
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252 | get_mono(&ts);
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253 | return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
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254 | }
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255 | unsigned long long FAST_FUNC monotonic_us(void)
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256 | {
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257 | struct timespec ts;
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258 | get_mono(&ts);
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259 | return ts.tv_sec * 1000000ULL + ts.tv_nsec/1000;
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260 | }
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261 | unsigned long long FAST_FUNC monotonic_ms(void)
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262 | {
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263 | struct timespec ts;
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264 | get_mono(&ts);
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265 | return ts.tv_sec * 1000ULL + ts.tv_nsec/1000000;
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266 | }
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267 | unsigned FAST_FUNC monotonic_sec(void)
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268 | {
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269 | struct timespec ts;
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270 | get_mono(&ts);
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271 | return ts.tv_sec;
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272 | }
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273 |
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274 | #else
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275 |
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276 | unsigned long long FAST_FUNC monotonic_ns(void)
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277 | {
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278 | struct timeval tv;
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279 | gettimeofday(&tv, NULL);
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280 | return tv.tv_sec * 1000000000ULL + tv.tv_usec * 1000;
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281 | }
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282 | unsigned long long FAST_FUNC monotonic_us(void)
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283 | {
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284 | struct timeval tv;
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285 | gettimeofday(&tv, NULL);
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286 | return tv.tv_sec * 1000000ULL + tv.tv_usec;
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287 | }
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288 | unsigned long long FAST_FUNC monotonic_ms(void)
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289 | {
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290 | struct timeval tv;
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291 | gettimeofday(&tv, NULL);
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292 | return tv.tv_sec * 1000ULL + tv.tv_usec / 1000;
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293 | }
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294 | unsigned FAST_FUNC monotonic_sec(void)
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295 | {
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296 | return time(NULL);
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297 | }
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298 |
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299 | #endif
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