src/functional/strptime.c

   1 // SPDX-License-Identifier: MIT
   2
   3 #define _GNU_SOURCE     /* For tm_gmtoff */
   4 #include <stddef.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <time.h>
   8 #include "test.h"
   9
  10 /**
  11  * checkStrptime - parse time and check if it matches expected value
  12  *
  13  * This function compares time and date fields of tm structure only.
  14  * It's because tm_wday and tm_yday may - but don't have to - be set
  15  * while parsing a date.
  16  */
  17 static void checkStrptime(const char *s, const char *format, const struct tm *expected) {
  18         struct tm tm = { };
  19         const char *ret;
  20
  21         ret = strptime(s, format, &tm);
  22         if (!ret || *ret != '\0') {
  23                 t_error("\"%s\": failed to parse \"%s\"\n", format, s);
  24         } else if (tm.tm_sec != expected->tm_sec ||
  25                    tm.tm_min != expected->tm_min ||
  26                    tm.tm_hour != expected->tm_hour ||
  27                    tm.tm_mday != expected->tm_mday ||
  28                    tm.tm_mon != expected->tm_mon ||
  29                    tm.tm_year != expected->tm_year) {
  30                 char buf1[64];
  31                 char buf2[64];
  32
  33                 strftime(buf1, sizeof(buf1), "%FT%H:%M:%S%Z", expected);
  34                 strftime(buf2, sizeof(buf2), "%FT%H:%M:%S%Z", &tm);
  35
  36                 t_error("\"%s\": for \"%s\" expected %s but got %s\n", format, s, buf1, buf2);
  37         }
  38 }
  39
  40 static void checkStrptimeTz(const char *s, int h, int m) {
  41         long int expected = h * 3600 + m * 60;
  42         struct tm tm = { };
  43         const char *ret;
  44
  45         ret = strptime(s, "%z", &tm);
  46         if (!ret || *ret != '\0') {
  47                 t_error("\"%%z\": failed to parse \"%s\"\n", s);
  48         } else if (tm.tm_gmtoff != expected) {
  49                 t_error("\"%%z\": for \"%s\" expected tm_gmtoff %ld but got %ld\n", s, tm.tm_gmtoff, expected);
  50         }
  51 }
  52
  53 static struct tm tm1 = {
  54         .tm_sec = 8,
  55         .tm_min = 57,
  56         .tm_hour = 20,
  57         .tm_mday = 0,
  58         .tm_mon = 0,
  59         .tm_year = 0,
  60 };
  61
  62 static struct tm tm2 = {
  63         .tm_sec = 0,
  64         .tm_min = 0,
  65         .tm_hour = 0,
  66         .tm_mday = 25,
  67         .tm_mon = 8 - 1,
  68         .tm_year = 1991 - 1900,
  69 };
  70
  71 static struct tm tm3 = {
  72         .tm_sec = 0,
  73         .tm_min = 0,
  74         .tm_hour = 0,
  75         .tm_mday = 21,
  76         .tm_mon = 10 - 1,
  77         .tm_year = 2015 - 1900,
  78 };
  79
  80 static struct tm tm4 = {
  81         .tm_sec = 0,
  82         .tm_min = 0,
  83         .tm_hour = 0,
  84         .tm_mday = 10,
  85         .tm_mon = 7 - 1,
  86         .tm_year = 1856 - 1900,
  87 };
  88
  89 int main() {
  90         setenv("TZ", "UTC0", 1);
  91
  92         /* Time */
  93         checkStrptime("20:57:08", "%H:%M:%S", &tm1);
  94         checkStrptime("20:57:8", "%R:%S", &tm1);
  95         checkStrptime("20:57:08", "%T", &tm1);
  96
  97         /* Format */
  98         checkStrptime("20:57:08", "%H : %M  :  %S", &tm1);
  99         checkStrptime("20 57  08", "%H %M %S", &tm1);
 100         checkStrptime("20%57%08", "%H %% %M%%%S", &tm1);
 101         checkStrptime("foo20bar57qux08      ", "foo %Hbar %M qux%S ", &tm1);
 102
 103         /* Date */
 104         checkStrptime("1991-08-25", "%Y-%m-%d", &tm2);
 105         checkStrptime("25.08.91", "%d.%m.%y", &tm2);
 106         checkStrptime("08/25/91", "%D", &tm2);
 107         checkStrptime("21.10.15", "%d.%m.%y", &tm3);
 108         checkStrptime("10.7.56 in 18th", "%d.%m.%y in %C th", &tm4);
 109
 110         /* Glibc */
 111         checkStrptime("1856-07-10", "%F", &tm4);
 112         checkStrptime("683078400", "%s", &tm2);
 113         checkStrptimeTz("+0200", 2, 0);
 114         checkStrptimeTz("-0530", -5, -30);
 115         checkStrptimeTz("-06", -6, 0);
 116
 117         return t_status;
 118 }