Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-imap/imap-date.c @ 956:26cafa3dc09c HEAD

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minor optimization
author Timo Sirainen <tss@iki.fi>
date Sun, 12 Jan 2003 01:49:45 +0200
parents e524da896d92
children 4937e278489c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
119
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1 /* Copyright (C) 2002 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "utc-offset.h"
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5 #include "utc-mktime.h"
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6 #include "imap-date.h"
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7
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8 #include <ctype.h>
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9
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10 static const char *month_names[] = {
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11 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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12 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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13 };
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14
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15 static int parse_timezone(const char *str)
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16 {
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17 int offset;
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18
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19 /* +|-zone */
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20 if ((*str != '+' && *str != '-') ||
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21 !i_isdigit(str[1]) || !i_isdigit(str[2]) ||
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22 !i_isdigit(str[3]) || !i_isdigit(str[4]))
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23 return 0;
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24
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25 offset = (str[1]-'0') * 10*60 + (str[2]-'0') * 60 +
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26 (str[3]-'0') * 10 + (str[4]-'0');
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27 return *str == '+' ? offset : -offset;
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28 }
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29
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30 static const char *imap_parse_date_internal(const char *str, struct tm *tm)
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31 {
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32 int i;
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33
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34 if (str == NULL || *str == '\0')
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35 return NULL;
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36
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37 memset(tm, 0, sizeof(struct tm));
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38
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39 /* "dd-mon-yyyy [hh:mi:ss +|-zone]"
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40 dd is 1-2 digits and may be prefixed with space or zero. */
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41
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42 if (str[0] == ' ') {
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43 /* " d-..." */
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44 str++;
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45 }
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46
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47 if (!(i_isdigit(str[0]) && (str[1] == '-' ||
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48 (i_isdigit(str[1]) && str[2] == '-'))))
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49 return NULL;
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50
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51 tm->tm_mday = (str[0]-'0');
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52 if (str[1] == '-')
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53 str += 2;
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54 else {
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55 tm->tm_mday = (tm->tm_mday * 10) + (str[1]-'0');
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56 str += 3;
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57 }
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58
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59 /* month name */
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60 for (i = 0; i < 12; i++) {
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61 if (strncasecmp(month_names[i], str, 3) == 0) {
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62 tm->tm_mon = i;
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63 break;
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64 }
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65 }
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66 if (i == 12 || str[3] != '-')
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67 return NULL;
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68 str += 4;
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69
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70 /* yyyy */
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71 if (!i_isdigit(str[0]) || !i_isdigit(str[1]) ||
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72 !i_isdigit(str[2]) || !i_isdigit(str[3]))
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73 return NULL;
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74
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75 tm->tm_year = (str[0]-'0') * 1000 + (str[1]-'0') * 100 +
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76 (str[2]-'0') * 10 + (str[3]-'0') - 1900;
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77
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78 str += 4;
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79 return str;
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80 }
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81
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82 int imap_parse_date(const char *str, time_t *time)
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83 {
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84 struct tm tm, *tml;
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85
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86 str = imap_parse_date_internal(str, &tm);
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87 if (str == NULL)
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88 return FALSE;
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89
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90 tm.tm_isdst = -1;
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91 *time = mktime(&tm);
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92 if (*time == (time_t)-1)
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93 return FALSE;
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94
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95 /* get it to UTC */
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96 tml = localtime(time);
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97 *time -= utc_offset(tml, *time);
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98 return TRUE;
119
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99 }
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100
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101 int imap_parse_datetime(const char *str, time_t *time, int *timezone_offset)
119
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102 {
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103 struct tm tm;
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104
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105 str = imap_parse_date_internal(str, &tm);
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106 if (str == NULL)
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107 return FALSE;
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108
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109 if (str[0] != ' ')
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110 return FALSE;
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111 str++;
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112
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113 /* hh: */
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114 if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ':')
119
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115 return FALSE;
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116 tm.tm_hour = (str[0]-'0') * 10 + (str[1]-'0');
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117 str += 3;
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118
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119 /* mm: */
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120 if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ':')
119
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121 return FALSE;
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122 tm.tm_min = (str[0]-'0') * 10 + (str[1]-'0');
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123 str += 3;
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124
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125 /* ss */
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126 if (!i_isdigit(str[0]) || !i_isdigit(str[1]) || str[2] != ' ')
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127 return FALSE;
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128 tm.tm_sec = (str[0]-'0') * 10 + (str[1]-'0');
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129 str += 3;
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130
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131 /* timezone */
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132 *timezone_offset = parse_timezone(str);
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133
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134 tm.tm_isdst = -1;
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135 *time = utc_mktime(&tm);
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136 if (*time == (time_t)-1)
119
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137 return FALSE;
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138
492
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139 *time -= *timezone_offset * 60;
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140 return TRUE;
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141 }
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142
579
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143 static const char *imap_to_datetime_internal(struct tm *tm, int timezone_offset)
492
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144 {
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145 int negative;
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146
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147 if (timezone_offset >= 0)
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148 negative = 0;
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149 else {
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150 negative = 1;
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151 timezone_offset = -timezone_offset;
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152 }
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153
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154 return t_strdup_printf("%02d-%s-%04d %02d:%02d:%02d %c%02d%02d",
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155 tm->tm_mday, month_names[tm->tm_mon],
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156 tm->tm_year+1900,
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157 tm->tm_hour, tm->tm_min, tm->tm_sec,
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158 negative ? '-' : '+',
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159 timezone_offset / 60, timezone_offset % 60);
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160 }
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161
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162 const char *imap_to_datetime_offset(time_t time, int timezone_offset)
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163 {
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164 struct tm *tm;
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165
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166 time += timezone_offset;
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167 tm = gmtime(&time);
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168 return imap_to_datetime_internal(tm, timezone_offset);
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169 }
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170
119
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171 const char *imap_to_datetime(time_t time)
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172 {
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173 struct tm *tm;
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174
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175 tm = localtime(&time);
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176 return imap_to_datetime_internal(tm, utc_offset(tm, time));
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177 }