1 | /* |
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2 | * Copyright (c) 1999 Kungliga Tekniska Högskolan |
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3 | * (Royal Institute of Technology, Stockholm, Sweden). |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * 3. Neither the name of KTH nor the names of its contributors may be |
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18 | * used to endorse or promote products derived from this software without |
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19 | * specific prior written permission. |
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20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
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22 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE |
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25 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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29 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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30 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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31 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
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32 | |
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33 | #define _GNU_SOURCE |
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34 | #include <stddef.h> |
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35 | #include <stdio.h> |
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36 | #include <time.h> |
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37 | #include <string.h> |
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38 | #include <strings.h> |
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39 | #include <ctype.h> |
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40 | #include <stdlib.h> |
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41 | #include <errno.h> |
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42 | #include <inttypes.h> |
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43 | #include <limits.h> |
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44 | #include "../locale/setlocale.h" |
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45 | |
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46 | #define _ctloc(x) (_CurrentTimeLocale->x) |
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47 | |
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48 | static const int _DAYS_BEFORE_MONTH[12] = |
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49 | {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; |
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50 | |
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51 | #define SET_MDAY 1 |
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52 | #define SET_MON 2 |
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53 | #define SET_YEAR 4 |
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54 | #define SET_WDAY 8 |
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55 | #define SET_YDAY 16 |
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56 | #define SET_YMD (SET_YEAR | SET_MON | SET_MDAY) |
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57 | |
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58 | /* |
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59 | * tm_year is relative this year |
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60 | */ |
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61 | const int tm_year_base = 1900; |
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62 | |
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63 | /* |
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64 | * Return TRUE iff `year' was a leap year. |
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65 | * Needed for strptime. |
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66 | */ |
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67 | static int |
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68 | is_leap_year (int year) |
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69 | { |
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70 | return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0); |
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71 | } |
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72 | |
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73 | /* Needed for strptime. */ |
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74 | static int |
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75 | match_string (const char *__restrict *buf, const char * const*strs, |
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76 | locale_t locale) |
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77 | { |
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78 | int i = 0; |
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79 | |
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80 | for (i = 0; strs[i] != NULL; ++i) { |
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81 | int len = strlen (strs[i]); |
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82 | |
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83 | if (strncasecmp_l (*buf, strs[i], len, locale) == 0) { |
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84 | *buf += len; |
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85 | return i; |
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86 | } |
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87 | } |
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88 | return -1; |
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89 | } |
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90 | |
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91 | /* Needed for strptime. */ |
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92 | static int |
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93 | first_day (int year) |
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94 | { |
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95 | int ret = 4; |
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96 | |
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97 | while (--year >= 1970) |
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98 | ret = (ret + 365 + is_leap_year (year)) % 7; |
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99 | return ret; |
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100 | } |
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101 | |
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102 | /* |
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103 | * Set `timeptr' given `wnum' (week number [0, 53]) |
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104 | * Needed for strptime |
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105 | */ |
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106 | |
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107 | static void |
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108 | set_week_number_sun (struct tm *timeptr, int wnum) |
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109 | { |
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110 | int fday = first_day (timeptr->tm_year + tm_year_base); |
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111 | |
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112 | timeptr->tm_yday = wnum * 7 + timeptr->tm_wday - fday; |
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113 | if (timeptr->tm_yday < 0) { |
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114 | timeptr->tm_wday = fday; |
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115 | timeptr->tm_yday = 0; |
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116 | } |
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117 | } |
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118 | |
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119 | /* |
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120 | * Set `timeptr' given `wnum' (week number [0, 53]) |
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121 | * Needed for strptime |
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122 | */ |
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123 | |
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124 | static void |
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125 | set_week_number_mon (struct tm *timeptr, int wnum) |
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126 | { |
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127 | int fday = (first_day (timeptr->tm_year + tm_year_base) + 6) % 7; |
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128 | |
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129 | timeptr->tm_yday = wnum * 7 + (timeptr->tm_wday + 6) % 7 - fday; |
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130 | if (timeptr->tm_yday < 0) { |
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131 | timeptr->tm_wday = (fday + 1) % 7; |
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132 | timeptr->tm_yday = 0; |
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133 | } |
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134 | } |
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135 | |
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136 | /* |
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137 | * Set `timeptr' given `wnum' (week number [0, 53]) |
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138 | * Needed for strptime |
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139 | */ |
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140 | static void |
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141 | set_week_number_mon4 (struct tm *timeptr, int wnum) |
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142 | { |
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143 | int fday = (first_day (timeptr->tm_year + tm_year_base) + 6) % 7; |
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144 | int offset = 0; |
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145 | |
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146 | if (fday < 4) |
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147 | offset += 7; |
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148 | |
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149 | timeptr->tm_yday = offset + (wnum - 1) * 7 + timeptr->tm_wday - fday; |
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150 | if (timeptr->tm_yday < 0) { |
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151 | timeptr->tm_wday = fday; |
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152 | timeptr->tm_yday = 0; |
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153 | } |
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154 | } |
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155 | |
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156 | char * |
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157 | strptime_l (const char *buf, const char *format, struct tm *timeptr, |
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158 | locale_t locale) |
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159 | { |
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160 | char c; |
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161 | int ymd = 0; |
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162 | |
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163 | const struct lc_time_T *_CurrentTimeLocale = __get_time_locale (locale); |
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164 | for (; (c = *format) != '\0'; ++format) { |
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165 | char *s; |
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166 | int ret; |
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167 | |
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168 | if (isspace_l ((unsigned char) c, locale)) { |
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169 | while (isspace_l ((unsigned char) *buf, locale)) |
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170 | ++buf; |
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171 | } else if (c == '%' && format[1] != '\0') { |
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172 | c = *++format; |
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173 | if (c == 'E' || c == 'O') |
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174 | c = *++format; |
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175 | switch (c) { |
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176 | case 'A' : |
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177 | ret = match_string (&buf, _ctloc (weekday), locale); |
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178 | if (ret < 0) |
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179 | return NULL; |
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180 | timeptr->tm_wday = ret; |
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181 | ymd |= SET_WDAY; |
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182 | break; |
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183 | case 'a' : |
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184 | ret = match_string (&buf, _ctloc (wday), locale); |
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185 | if (ret < 0) |
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186 | return NULL; |
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187 | timeptr->tm_wday = ret; |
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188 | ymd |= SET_WDAY; |
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189 | break; |
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190 | case 'B' : |
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191 | ret = match_string (&buf, _ctloc (month), locale); |
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192 | if (ret < 0) |
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193 | return NULL; |
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194 | timeptr->tm_mon = ret; |
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195 | ymd |= SET_MON; |
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196 | break; |
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197 | case 'b' : |
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198 | case 'h' : |
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199 | ret = match_string (&buf, _ctloc (mon), locale); |
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200 | if (ret < 0) |
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201 | return NULL; |
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202 | timeptr->tm_mon = ret; |
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203 | ymd |= SET_MON; |
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204 | break; |
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205 | case 'C' : |
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206 | ret = strtol_l (buf, &s, 10, locale); |
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207 | if (s == buf) |
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208 | return NULL; |
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209 | timeptr->tm_year = (ret * 100) - tm_year_base; |
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210 | buf = s; |
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211 | ymd |= SET_YEAR; |
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212 | break; |
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213 | case 'c' : /* %a %b %e %H:%M:%S %Y */ |
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214 | s = strptime_l (buf, _ctloc (c_fmt), timeptr, locale); |
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215 | if (s == NULL) |
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216 | return NULL; |
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217 | buf = s; |
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218 | ymd |= SET_WDAY | SET_YMD; |
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219 | break; |
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220 | case 'D' : /* %m/%d/%y */ |
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221 | s = strptime_l (buf, "%m/%d/%y", timeptr, locale); |
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222 | if (s == NULL) |
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223 | return NULL; |
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224 | buf = s; |
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225 | ymd |= SET_YMD; |
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226 | break; |
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227 | case 'd' : |
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228 | case 'e' : |
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229 | ret = strtol_l (buf, &s, 10, locale); |
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230 | if (s == buf) |
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231 | return NULL; |
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232 | timeptr->tm_mday = ret; |
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233 | buf = s; |
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234 | ymd |= SET_MDAY; |
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235 | break; |
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236 | case 'F' : /* %Y-%m-%d - GNU extension */ |
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237 | s = strptime_l (buf, "%Y-%m-%d", timeptr, locale); |
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238 | if (s == NULL || s == buf) |
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239 | return NULL; |
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240 | buf = s; |
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241 | ymd |= SET_YMD; |
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242 | break; |
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243 | case 'H' : |
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244 | case 'k' : /* hour with leading space - GNU extension */ |
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245 | ret = strtol_l (buf, &s, 10, locale); |
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246 | if (s == buf) |
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247 | return NULL; |
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248 | timeptr->tm_hour = ret; |
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249 | buf = s; |
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250 | break; |
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251 | case 'I' : |
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252 | case 'l' : /* hour with leading space - GNU extension */ |
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253 | ret = strtol_l (buf, &s, 10, locale); |
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254 | if (s == buf) |
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255 | return NULL; |
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256 | if (ret == 12) |
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257 | timeptr->tm_hour = 0; |
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258 | else |
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259 | timeptr->tm_hour = ret; |
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260 | buf = s; |
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261 | break; |
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262 | case 'j' : |
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263 | ret = strtol_l (buf, &s, 10, locale); |
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264 | if (s == buf) |
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265 | return NULL; |
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266 | timeptr->tm_yday = ret - 1; |
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267 | buf = s; |
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268 | ymd |= SET_YDAY; |
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269 | break; |
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270 | case 'm' : |
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271 | ret = strtol_l (buf, &s, 10, locale); |
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272 | if (s == buf) |
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273 | return NULL; |
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274 | timeptr->tm_mon = ret - 1; |
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275 | buf = s; |
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276 | ymd |= SET_MON; |
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277 | break; |
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278 | case 'M' : |
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279 | ret = strtol_l (buf, &s, 10, locale); |
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280 | if (s == buf) |
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281 | return NULL; |
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282 | timeptr->tm_min = ret; |
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283 | buf = s; |
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284 | break; |
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285 | case 'n' : |
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286 | if (*buf == '\n') |
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287 | ++buf; |
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288 | else |
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289 | return NULL; |
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290 | break; |
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291 | case 'p' : |
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292 | ret = match_string (&buf, _ctloc (am_pm), locale); |
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293 | if (ret < 0) |
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294 | return NULL; |
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295 | if (timeptr->tm_hour == 0) { |
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296 | if (ret == 1) |
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297 | timeptr->tm_hour = 12; |
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298 | } else |
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299 | timeptr->tm_hour += 12; |
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300 | break; |
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301 | case 'r' : /* %I:%M:%S %p */ |
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302 | s = strptime_l (buf, _ctloc (ampm_fmt), timeptr, locale); |
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303 | if (s == NULL) |
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304 | return NULL; |
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305 | buf = s; |
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306 | break; |
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307 | case 'R' : /* %H:%M */ |
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308 | s = strptime_l (buf, "%H:%M", timeptr, locale); |
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309 | if (s == NULL) |
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310 | return NULL; |
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311 | buf = s; |
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312 | break; |
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313 | case 's' : /* seconds since Unix epoch - GNU extension */ |
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314 | { |
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315 | long long sec; |
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316 | time_t t; |
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317 | int save_errno; |
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318 | |
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319 | save_errno = errno; |
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320 | errno = 0; |
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321 | sec = strtoll_l (buf, &s, 10, locale); |
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322 | t = sec; |
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323 | if (s == buf |
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324 | || errno != 0 |
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325 | || t != sec |
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326 | || localtime_r (&t, timeptr) != timeptr) |
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327 | return NULL; |
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328 | errno = save_errno; |
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329 | buf = s; |
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330 | ymd |= SET_YDAY | SET_WDAY | SET_YMD; |
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331 | break; |
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332 | } |
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333 | case 'S' : |
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334 | ret = strtol_l (buf, &s, 10, locale); |
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335 | if (s == buf) |
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336 | return NULL; |
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337 | timeptr->tm_sec = ret; |
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338 | buf = s; |
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339 | break; |
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340 | case 't' : |
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341 | if (*buf == '\t') |
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342 | ++buf; |
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343 | else |
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344 | return NULL; |
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345 | break; |
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346 | case 'T' : /* %H:%M:%S */ |
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347 | s = strptime_l (buf, "%H:%M:%S", timeptr, locale); |
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348 | if (s == NULL) |
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349 | return NULL; |
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350 | buf = s; |
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351 | break; |
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352 | case 'u' : |
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353 | ret = strtol_l (buf, &s, 10, locale); |
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354 | if (s == buf) |
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355 | return NULL; |
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356 | timeptr->tm_wday = ret - 1; |
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357 | buf = s; |
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358 | ymd |= SET_WDAY; |
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359 | break; |
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360 | case 'w' : |
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361 | ret = strtol_l (buf, &s, 10, locale); |
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362 | if (s == buf) |
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363 | return NULL; |
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364 | timeptr->tm_wday = ret; |
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365 | buf = s; |
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366 | ymd |= SET_WDAY; |
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367 | break; |
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368 | case 'U' : |
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369 | ret = strtol_l (buf, &s, 10, locale); |
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370 | if (s == buf) |
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371 | return NULL; |
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372 | set_week_number_sun (timeptr, ret); |
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373 | buf = s; |
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374 | ymd |= SET_YDAY; |
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375 | break; |
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376 | case 'V' : |
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377 | ret = strtol_l (buf, &s, 10, locale); |
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378 | if (s == buf) |
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379 | return NULL; |
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380 | set_week_number_mon4 (timeptr, ret); |
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381 | buf = s; |
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382 | ymd |= SET_YDAY; |
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383 | break; |
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384 | case 'W' : |
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385 | ret = strtol_l (buf, &s, 10, locale); |
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386 | if (s == buf) |
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387 | return NULL; |
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388 | set_week_number_mon (timeptr, ret); |
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389 | buf = s; |
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390 | ymd |= SET_YDAY; |
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391 | break; |
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392 | case 'x' : |
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393 | s = strptime_l (buf, _ctloc (x_fmt), timeptr, locale); |
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394 | if (s == NULL) |
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395 | return NULL; |
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396 | buf = s; |
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397 | ymd |= SET_YMD; |
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398 | break; |
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399 | case 'X' : |
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400 | s = strptime_l (buf, _ctloc (X_fmt), timeptr, locale); |
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401 | if (s == NULL) |
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402 | return NULL; |
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403 | buf = s; |
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404 | break; |
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405 | case 'y' : |
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406 | ret = strtol_l (buf, &s, 10, locale); |
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407 | if (s == buf) |
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408 | return NULL; |
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409 | if (ret < 70) |
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410 | timeptr->tm_year = 100 + ret; |
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411 | else |
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412 | timeptr->tm_year = ret; |
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413 | buf = s; |
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414 | ymd |= SET_YEAR; |
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415 | break; |
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416 | case 'Y' : |
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417 | ret = strtol_l (buf, &s, 10, locale); |
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418 | if (s == buf) |
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419 | return NULL; |
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420 | timeptr->tm_year = ret - tm_year_base; |
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421 | buf = s; |
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422 | ymd |= SET_YEAR; |
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423 | break; |
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424 | case 'Z' : |
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425 | /* Unsupported. Just ignore. */ |
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426 | break; |
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427 | case '\0' : |
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428 | --format; |
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429 | /* FALLTHROUGH */ |
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430 | case '%' : |
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431 | if (*buf == '%') |
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432 | ++buf; |
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433 | else |
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434 | return NULL; |
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435 | break; |
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436 | default : |
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437 | if (*buf == '%' || *++buf == c) |
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438 | ++buf; |
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439 | else |
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440 | return NULL; |
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441 | break; |
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442 | } |
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443 | } else { |
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444 | if (*buf == c) |
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445 | ++buf; |
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446 | else |
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447 | return NULL; |
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448 | } |
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449 | } |
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450 | |
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451 | if ((ymd & SET_YMD) == SET_YMD) { |
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452 | /* all of tm_year, tm_mon and tm_mday, but... */ |
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453 | |
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454 | if (!(ymd & SET_YDAY)) { |
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455 | /* ...not tm_yday, so fill it in */ |
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456 | timeptr->tm_yday = _DAYS_BEFORE_MONTH[timeptr->tm_mon] |
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457 | + timeptr->tm_mday; |
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458 | if (!is_leap_year (timeptr->tm_year + tm_year_base) |
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459 | || timeptr->tm_mon < 2) |
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460 | { |
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461 | timeptr->tm_yday--; |
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462 | } |
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463 | ymd |= SET_YDAY; |
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464 | } |
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465 | } |
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466 | else if ((ymd & (SET_YEAR | SET_YDAY)) == (SET_YEAR | SET_YDAY)) { |
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467 | /* both of tm_year and tm_yday, but... */ |
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468 | |
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469 | if (!(ymd & SET_MON)) { |
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470 | /* ...not tm_mon, so fill it in, and/or... */ |
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471 | if (timeptr->tm_yday < _DAYS_BEFORE_MONTH[1]) |
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472 | timeptr->tm_mon = 0; |
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473 | else { |
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474 | int leap = is_leap_year (timeptr->tm_year + tm_year_base); |
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475 | int i; |
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476 | for (i = 2; i < 12; ++i) { |
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477 | if (timeptr->tm_yday < _DAYS_BEFORE_MONTH[i] + leap) |
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478 | break; |
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479 | } |
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480 | timeptr->tm_mon = i - 1; |
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481 | } |
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482 | } |
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483 | |
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484 | if (!(ymd & SET_MDAY)) { |
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485 | /* ...not tm_mday, so fill it in */ |
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486 | timeptr->tm_mday = timeptr->tm_yday |
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487 | - _DAYS_BEFORE_MONTH[timeptr->tm_mon]; |
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488 | if (!is_leap_year (timeptr->tm_year + tm_year_base) |
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489 | || timeptr->tm_mon < 2) |
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490 | { |
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491 | timeptr->tm_mday++; |
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492 | } |
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493 | } |
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494 | } |
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495 | |
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496 | if ((ymd & (SET_YEAR | SET_YDAY | SET_WDAY)) == (SET_YEAR | SET_YDAY)) { |
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497 | /* fill in tm_wday */ |
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498 | int fday = first_day (timeptr->tm_year + tm_year_base); |
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499 | timeptr->tm_wday = (fday + timeptr->tm_yday) % 7; |
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500 | } |
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501 | |
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502 | return (char *)buf; |
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503 | } |
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504 | |
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505 | char * |
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506 | strptime (const char *buf, const char *format, struct tm *timeptr) |
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507 | { |
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508 | return strptime_l (buf, format, timeptr, __get_current_locale ()); |
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509 | } |
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