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1 //======================================================================== |
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2 // |
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3 // timeutil.cxx |
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4 // |
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5 // ISO C date and time implementation support functions |
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6 // |
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7 //======================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //======================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour |
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34 // Date: 1999-02-26 |
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35 // Purpose: Provide support functions used by the ISO C date and time |
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36 // implementation |
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37 // Description: This file provides the functions: |
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38 // cyg_libc_time_normalize_structtm() |
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39 // cyg_libc_time_getzoneoffsets() |
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40 // cyg_libc_time_setzoneoffsets() |
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41 // cyg_libc_time_setdst() |
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42 // and the globals: |
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43 // cyg_libc_time_day_name |
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44 // cyg_libc_time_day_name_len |
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45 // cyg_libc_time_month_name |
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46 // cyg_libc_time_month_name_len |
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47 // cyg_libc_time_month_lengths |
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48 // cyg_libc_time_current_dst_stat |
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49 // cyg_libc_time_current_std_offset |
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50 // cyg_libc_time_current_dst_offset |
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51 // Usage: |
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52 // |
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53 //####DESCRIPTIONEND#### |
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54 // |
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55 //======================================================================== |
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56 |
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57 // CONFIGURATION |
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58 |
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59 #include <pkgconf/libc.h> // C library configuration |
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60 |
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61 // INCLUDES |
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62 |
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63 // define these functions as outline, not inline, functions in this file |
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64 #define CYGPRI_LIBC_TIME_GETZONEOFFSETS_INLINE extern "C" |
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65 #define CYGPRI_LIBC_TIME_SETZONEOFFSETS_INLINE extern "C" |
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66 #define CYGPRI_LIBC_TIME_SETDST_INLINE extern "C" |
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67 |
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68 #include <cyg/infra/cyg_type.h> // Common type definitions and support |
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69 #include <sys/timeutil.h> // Header for this file |
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70 #include <time.h> // Main date and time definitions |
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71 #include <stdlib.h> // for div() |
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72 |
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73 |
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74 // GLOBALS |
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75 |
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76 // FIXME: PR19440 - const char & -fwritable-strings don't mix |
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77 /*const*/ char cyg_libc_time_day_name[7][10] = { |
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78 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", |
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79 "Saturday" |
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80 }; |
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81 const cyg_uint8 cyg_libc_time_day_name_len[7] = { 6, 6, 7, 9, 8, 6, 8 }; |
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82 |
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83 // FIXME: PR19440 - const char & -fwritable-strings don't mix |
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84 /*const*/ char cyg_libc_time_month_name[12][10] = { |
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85 "January", "February", "March", "April", "May", "June", |
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86 "July", "August", "September", "October", "November", "December" |
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87 }; |
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88 const cyg_uint8 cyg_libc_time_month_name_len[12] = { 7, 8, 5, 5, 3, 4, |
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89 4, 6, 9, 7, 8, 8 }; |
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90 |
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91 const cyg_uint8 cyg_libc_time_month_lengths[2][12] = { |
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92 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, |
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93 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} |
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94 }; |
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95 |
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96 Cyg_libc_time_dst cyg_libc_time_current_dst_stat = |
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97 (Cyg_libc_time_dst)CYGNUM_LIBC_TIME_DST_DEFAULT_STATE; |
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98 time_t cyg_libc_time_current_std_offset = |
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99 (time_t)CYGNUM_LIBC_TIME_STD_DEFAULT_OFFSET; |
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100 time_t cyg_libc_time_current_dst_offset = |
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101 (time_t)CYGNUM_LIBC_TIME_DST_DEFAULT_OFFSET; |
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102 |
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103 |
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104 // FUNCTIONS |
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105 |
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106 //////////////////////////////////////// |
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107 // cyg_libc_time_normalize_structtm() // |
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108 //////////////////////////////////////// |
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109 // |
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110 // cyg_libc_time_normalize_structtm() will adjust the fields of a struct tm |
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111 // so that they are within the normal ranges expected. |
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112 // tm_wday, tm_yday and tm_isdst are ignored |
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113 |
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114 externC void |
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115 cyg_libc_time_normalize_structtm( struct tm *timeptr ) |
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116 { |
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117 div_t t; |
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118 |
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119 CYG_REPORT_FUNCNAME("cyg_libc_time_normalize_structtm"); |
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120 CYG_REPORT_FUNCARG1("timeptr is at address %08x", timeptr); |
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121 |
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122 // normalize seconds to 0..59 |
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123 if ((timeptr->tm_sec < 0) || (timeptr->tm_sec > 59)) { |
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124 t = div(timeptr->tm_sec, 60); |
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125 while (t.rem < 0) { |
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126 t.rem += 60; |
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127 --t.quot; |
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128 } |
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129 timeptr->tm_min += t.quot; |
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130 timeptr->tm_sec = t.rem; |
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131 } // if |
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132 |
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133 // normalize minutes to 0..59 |
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134 if ((timeptr->tm_min < 0) || (timeptr->tm_min > 59)) { |
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135 t = div(timeptr->tm_min, 60); |
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136 while (t.rem < 0) { |
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137 t.rem += 60; |
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138 --t.quot; |
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139 } |
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140 timeptr->tm_hour += t.quot; |
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141 timeptr->tm_min = t.rem; |
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142 } // if |
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143 |
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144 // normalize hours to 0..23 |
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145 if ((timeptr->tm_hour < 0) || (timeptr->tm_hour > 23)) { |
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146 t = div(timeptr->tm_hour, 24); |
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147 while (t.rem < 0) { |
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148 t.rem += 24; |
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149 --t.quot; |
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150 } |
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151 timeptr->tm_mday += t.quot; |
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152 timeptr->tm_hour = t.rem; |
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153 } // if |
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154 |
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155 // we wait before normalizing tm_mday as per ISO C 7.12.2.3 (although |
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156 // actually it only makes sense if you think about it |
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157 |
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158 // normalize months to 0..11 |
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159 if ((timeptr->tm_mon < 0) || (timeptr->tm_mon > 11)) { |
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160 t = div(timeptr->tm_mon, 12); |
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161 while (t.rem < 0) { |
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162 t.rem += 12; |
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163 --t.quot; |
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164 } |
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165 timeptr->tm_year += t.quot; |
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166 timeptr->tm_mon = t.rem; |
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167 } // if |
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168 |
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169 // now tm_mday which needs to go to 1..31 |
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170 cyg_bool leap = cyg_libc_time_year_is_leap(timeptr->tm_year); |
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171 |
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172 while (timeptr->tm_mday < 1) { |
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173 // move back a month |
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174 |
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175 if (--timeptr->tm_mon < 0) { |
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176 --timeptr->tm_year; |
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177 timeptr->tm_mon = 11; |
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178 leap = cyg_libc_time_year_is_leap(timeptr->tm_year); |
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179 } // if |
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180 |
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181 // we move backward the number of days in the _new_ current month |
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182 timeptr->tm_mday += cyg_libc_time_month_lengths[leap][timeptr->tm_mon]; |
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183 |
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184 } // while |
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185 |
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186 while (timeptr->tm_mday > |
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187 cyg_libc_time_month_lengths[leap][timeptr->tm_mon]) { |
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188 |
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189 // move forward a month |
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190 |
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191 // we move forward the number of days in the _old_ current month |
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192 timeptr->tm_mday -= cyg_libc_time_month_lengths[leap][timeptr->tm_mon]; |
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193 |
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194 if (++timeptr->tm_mon > 11) { |
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195 ++timeptr->tm_year; |
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196 timeptr->tm_mon = 0; |
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197 leap = cyg_libc_time_year_is_leap(timeptr->tm_year); |
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198 } // if |
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199 |
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200 } // while |
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201 |
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202 CYG_REPORT_RETURN(); |
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203 |
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204 } // cyg_libc_time_normalize_structtm() |
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205 |
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206 |
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207 // EOF timeutil.cxx |
