src/functional/strftime.c

   1 #include <limits.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <time.h>
   5 #include "test.h"
   6
   7 static char buffer[100];
   8
   9 static void checkStrftime(const char* format, const struct tm* tm,
  10                 const char* expected) {
  11         size_t resultLength = strftime(buffer, sizeof(buffer), format, tm);
  12
  13         if (resultLength != 0 && strcmp(buffer, expected) != 0) {
  14                 t_error("\"%s\": expected \"%s\", got \"%s\"\n", format, expected, buffer);
  15         } else if (resultLength == 0 && strlen(expected) != 0) {
  16                 t_error("\"%s\": expected \"%s\", got nothing\n", format, expected);
  17         }
  18 }
  19
  20 static struct tm tm1 = {
  21         .tm_sec = 45,
  22         .tm_min = 23,
  23         .tm_hour = 13,
  24         .tm_mday = 3,
  25         .tm_mon = 0,
  26         .tm_year = 2016 - 1900,
  27         .tm_wday = 0,
  28         .tm_yday = 2,
  29         .tm_isdst = 0
  30 };
  31
  32 static struct tm tm2 = {
  33         .tm_sec = 53,
  34         .tm_min = 17,
  35         .tm_hour = 5,
  36         .tm_mday = 5,
  37         .tm_mon = 0,
  38         .tm_year = 10009 - 1900,
  39         .tm_wday = 1,
  40         .tm_yday = 4,
  41         .tm_isdst = 0
  42 };
  43
  44 static struct tm tm3 = {
  45         .tm_sec = 0,
  46         .tm_min = 0,
  47         .tm_hour = 12,
  48         .tm_mday = 23,
  49         .tm_mon = 1,
  50         .tm_year = 0 - 1900,
  51         .tm_wday = 3,
  52         .tm_yday = 53,
  53         .tm_isdst = 0
  54 };
  55
  56 static struct tm tm4 = {
  57         .tm_sec = 0,
  58         .tm_min = 0,
  59         .tm_hour = 0,
  60         .tm_mday = 1,
  61         .tm_mon = 0,
  62         .tm_year = -123 - 1900,
  63         .tm_wday = 1,
  64         .tm_yday = 0,
  65         .tm_isdst = 0
  66 };
  67
  68 static struct tm tm5 = {
  69         .tm_sec = 0,
  70         .tm_min = 0,
  71         .tm_hour = 0,
  72         .tm_mday = 1,
  73         .tm_mon = 0,
  74         .tm_year = INT_MAX,
  75         .tm_wday = 3,
  76         .tm_yday = 0,
  77         .tm_isdst = 0
  78 };
  79
  80 int main() {
  81         setenv("TZ", "UTC0", 1);
  82
  83         checkStrftime("%c", &tm1, "Sun Jan  3 13:23:45 2016");
  84         checkStrftime("%c", &tm2, "Mon Jan  5 05:17:53 +10009");
  85         checkStrftime("%c", &tm3, "Wed Feb 23 12:00:00 0000");
  86
  87         // The POSIX.1-2008 standard does not specify the padding character for
  88         // "%C". The C standard requires that the number is padded by '0'.
  89         // See also http://austingroupbugs.net/view.php?id=1184
  90         checkStrftime("%C", &tm1, "20");
  91         checkStrftime("%03C", &tm1, "020");
  92         checkStrftime("%+3C", &tm1, "+20");
  93         checkStrftime("%C", &tm2, "100");
  94         checkStrftime("%C", &tm3, "00");
  95         checkStrftime("%01C", &tm3, "0");
  96
  97         checkStrftime("%F", &tm1, "2016-01-03");
  98         checkStrftime("%012F", &tm1, "002016-01-03");
  99         checkStrftime("%+10F", &tm1, "2016-01-03");
 100         checkStrftime("%+11F", &tm1, "+2016-01-03");
 101         checkStrftime("%F", &tm2, "+10009-01-05");
 102         checkStrftime("%011F", &tm2, "10009-01-05");
 103         checkStrftime("%F", &tm3, "0000-02-23");
 104         checkStrftime("%01F", &tm3, "0-02-23");
 105         checkStrftime("%06F", &tm3, "0-02-23");
 106         checkStrftime("%010F", &tm3, "0000-02-23");
 107         checkStrftime("%F", &tm4, "-123-01-01");
 108         checkStrftime("%011F", &tm4, "-0123-01-01");
 109
 110         checkStrftime("%g", &tm1, "15");
 111         checkStrftime("%g", &tm2, "09");
 112
 113         checkStrftime("%G", &tm1, "2015");
 114         checkStrftime("%+5G", &tm1, "+2015");
 115         checkStrftime("%04G", &tm2, "10009");
 116
 117         checkStrftime("%r", &tm1, "01:23:45 PM");
 118         checkStrftime("%r", &tm2, "05:17:53 AM");
 119         checkStrftime("%r", &tm3, "12:00:00 PM");
 120         checkStrftime("%r", &tm4, "12:00:00 AM");
 121
 122         // The "%s" specifier was accepted by the Austin Group for the next POSIX.1
 123         // revision. See http://austingroupbugs.net/view.php?id=169
 124         checkStrftime("%s", &tm1, "1451827425");
 125         if (sizeof(time_t) * CHAR_BIT >= 64) {
 126                 checkStrftime("%s", &tm2, "253686748673");
 127         }
 128
 129         checkStrftime("%T", &tm1, "13:23:45");
 130         checkStrftime("%T", &tm2, "05:17:53");
 131         checkStrftime("%T", &tm3, "12:00:00");
 132         checkStrftime("%T", &tm4, "00:00:00");
 133
 134         checkStrftime("%U", &tm1, "01");
 135         checkStrftime("%U", &tm2, "01");
 136         checkStrftime("%U", &tm3, "08");
 137
 138         checkStrftime("%V", &tm1, "53");
 139         checkStrftime("%V", &tm2, "02");
 140         checkStrftime("%V", &tm3, "08");
 141
 142         checkStrftime("%W", &tm1, "00");
 143         checkStrftime("%W", &tm2, "01");
 144         checkStrftime("%W", &tm3, "08");
 145
 146         checkStrftime("%x", &tm1, "01/03/16");
 147         checkStrftime("%X", &tm1, "13:23:45");
 148         checkStrftime("%y", &tm1, "16");
 149
 150         // There is no standard that explicitly specifies the exact format of "%Y".
 151         // The C standard says that "%F" is equivalent to "%Y-%m-%d". The
 152         // POSIX.1-2008 standard says that "%F" is equivalent to "%+4Y-%m-%d".
 153         // This implies that to conform to both standards "%Y" needs to be
 154         // equivalent to "%+4Y".
 155         // See also http://austingroupbugs.net/view.php?id=739
 156         checkStrftime("%Y", &tm1, "2016");
 157         checkStrftime("%05Y", &tm1, "02016");
 158         checkStrftime("%+4Y", &tm1, "2016");
 159         checkStrftime("%+5Y", &tm1, "+2016");
 160         checkStrftime("%Y", &tm2, "+10009");
 161         checkStrftime("%05Y", &tm2, "10009");
 162         checkStrftime("%Y", &tm3, "0000");
 163         checkStrftime("%02Y", &tm3, "00");
 164         checkStrftime("%+5Y", &tm3, "+0000");
 165         checkStrftime("%Y", &tm4, "-123");
 166         checkStrftime("%+4Y", &tm4, "-123");
 167         checkStrftime("%+5Y", &tm4, "-0123");
 168
 169         if (INT_MAX == 0x7FFFFFFF) {
 170                 // The standard does not specify any range for tm_year, so INT_MAX
 171                 // should be valid.
 172                 checkStrftime("%y", &tm5, "47");
 173                 checkStrftime("%Y", &tm5, "+2147485547");
 174                 checkStrftime("%011Y", &tm5, "02147485547");
 175                 if (sizeof(time_t) * CHAR_BIT >= 64) {
 176                         checkStrftime("%s", &tm5, "67768036160140800");
 177                 }
 178         }
 179
 180         return t_status;
 181 }