ReactOS  0.4.15-dev-5142-g967f5b9
gmtime.c File Reference
#include <precomp.h>
Include dependency graph for gmtime.c:

Go to the source code of this file.

Functions

struct tm_gmtime_worker (struct tm *ptm, __time64_t time, int do_dst)
 
struct tm_gmtime64 (const __time64_t *ptime)
 
errno_t _gmtime64_s (struct tm *ptm, const __time64_t *ptime)
 
struct tm_gmtime32 (const __time32_t *ptime)
 
errno_t _gmtime32_s (struct tm *ptm, const __time32_t *ptime)
 
struct tmgmtime (const time_t *ptime)
 

Variables

unsigned int g_monthdays [13] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}
 
unsigned int g_lpmonthdays [13] = {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
 

Function Documentation

◆ _gmtime32()

struct tm* _gmtime32 ( const __time32_t ptime)

Definition at line 153 of file gmtime.c.

154 {
155  __time64_t time64;
156 
157  if (!ptime)
158  return NULL;
159  time64 = *ptime;
160  return _gmtime64(&time64);
161 }
struct tm * _gmtime64(const __time64_t *ptime)
Definition: gmtime.c:104
#define NULL
Definition: types.h:112
__MINGW_EXTENSION typedef __int64 __time64_t
Definition: crtdefs.h:385

◆ _gmtime32_s()

errno_t _gmtime32_s ( struct tm ptm,
const __time32_t ptime 
)

Definition at line 164 of file gmtime.c.

167 {
168  __time64_t time = *ptime;
169  if (!ptm)
170  {
171  MSVCRT_INVALID_PMT("ptm == NULL", ERROR_BAD_COMMAND);
172  return ERROR_BAD_COMMAND;
173  }
174 
175  if (!ptime)
176  {
177  MSVCRT_INVALID_PMT("ptime == NULL", ERROR_BAD_COMMAND);
178  return ERROR_BAD_COMMAND;
179  }
180 
181  _gmtime_worker(ptm, time, 0);
182 
183  return ERROR_SUCCESS;
184 }
#define ERROR_SUCCESS
Definition: deptool.c:10
__u16 time
Definition: mkdosfs.c:366
struct tm * _gmtime_worker(struct tm *ptm, __time64_t time, int do_dst)
Definition: gmtime.c:14
#define MSVCRT_INVALID_PMT(x)
Definition: mbstowcs_s.c:25
#define ERROR_BAD_COMMAND
Definition: winerror.h:125
__MINGW_EXTENSION typedef __int64 __time64_t
Definition: crtdefs.h:385

◆ _gmtime64()

struct tm* _gmtime64 ( const __time64_t ptime)

Definition at line 104 of file gmtime.c.

105 {
107 
108  /* Validate parameters */
109  if (!ptime || *ptime < 0)
110  {
111  return NULL;
112  }
113 
114  if(!data->time_buffer)
115  data->time_buffer = malloc(sizeof(struct tm));
116 
117  /* Use _gmtime_worker to do the real work */
118  return _gmtime_worker(data->time_buffer, *ptime, 0);
119 }
struct tm * _gmtime_worker(struct tm *ptm, __time64_t time, int do_dst)
Definition: gmtime.c:14
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: gl.h:1950
Definition: time.h:68
thread_data_t * msvcrt_get_thread_data(void)
Definition: tls.c:31
#define NULL
Definition: types.h:112
#define malloc
Definition: debug_ros.c:4

Referenced by _gmtime32(), and gmtime().

◆ _gmtime64_s()

errno_t _gmtime64_s ( struct tm ptm,
const __time64_t ptime 
)

Definition at line 122 of file gmtime.c.

125 {
127 
128  if (!ptm)
129  {
130  MSVCRT_INVALID_PMT("ptm == NULL", ERROR_BAD_COMMAND);
131  return ERROR_BAD_COMMAND;
132  }
133 
134  if (!ptime)
135  {
136  MSVCRT_INVALID_PMT("ptime == NULL", ERROR_BAD_COMMAND);
137  return ERROR_BAD_COMMAND;
138  }
139 
140  time = *ptime;
141 
142  _gmtime_worker(ptm, time, 0);
143 
144  return ERROR_SUCCESS;
145 }
#define ERROR_SUCCESS
Definition: deptool.c:10
__u16 time
Definition: mkdosfs.c:366
struct tm * _gmtime_worker(struct tm *ptm, __time64_t time, int do_dst)
Definition: gmtime.c:14
#define MSVCRT_INVALID_PMT(x)
Definition: mbstowcs_s.c:25
#define ERROR_BAD_COMMAND
Definition: winerror.h:125
__MINGW_EXTENSION typedef __int64 __time64_t
Definition: crtdefs.h:385

◆ _gmtime_worker()

struct tm* _gmtime_worker ( struct tm ptm,
__time64_t  time,
int  do_dst 
)

Definition at line 14 of file gmtime.c.

15 {
16  unsigned int days, daystoyear, dayinyear, leapdays, leapyears, years, month;
17  unsigned int secondinday, secondinhour;
18  unsigned int *padays;
19 
20  if (time < 0)
21  {
22  return 0;
23  }
24 
25  /* Divide into date and time */
26  days = (unsigned int)(time / SECONDSPERDAY);
27  secondinday = time % SECONDSPERDAY;
28 
29  /* Shift to days from 1.1.1601 */
30  days += DIFFDAYS;
31 
32  /* Calculate leap days passed till today */
33  leapdays = leapdays_passed(days);
34 
35  /* Calculate number of full leap years passed */
36  leapyears = leapyears_passed(days);
37 
38  /* Are more leap days passed than leap years? */
39  if (leapdays > leapyears)
40  {
41  /* Yes, we're in a leap year */
42  padays = g_lpmonthdays;
43  }
44  else
45  {
46  /* No, normal year */
47  padays = g_monthdays;
48  }
49 
50  /* Calculate year */
51  years = (days - leapdays) / 365;
52  ptm->tm_year = years - 299;
53 
54  /* Calculate number of days till 1.1. of this year */
55  daystoyear = years * 365 + leapyears;
56 
57  /* Calculate the day in this year */
58  dayinyear = days - daystoyear;
59 
60  /* Shall we do DST corrections? */
61  ptm->tm_isdst = 0;
62  if (do_dst)
63  {
64  int yeartime = dayinyear * SECONDSPERDAY + secondinday ;
65  if (yeartime >= dst_begin && yeartime <= dst_end) // FIXME! DST in winter
66  {
67  time -= _dstbias;
68  days = (unsigned int)(time / SECONDSPERDAY + DIFFDAYS);
69  dayinyear = days - daystoyear;
70  ptm->tm_isdst = 1;
71  }
72  }
73 
74  ptm->tm_yday = dayinyear;
75 
76  /* dayinyear < 366 => terminates with i <= 11 */
77  for (month = 0; dayinyear >= padays[month+1]; month++)
78  ;
79 
80  /* Set month and day in month */
81  ptm->tm_mon = month;
82  ptm->tm_mday = 1 + dayinyear - padays[month];
83 
84  /* Get weekday */
85  ptm->tm_wday = (days + 1) % 7;
86 
87  /* Calculate hour and second in hour */
88  ptm->tm_hour = secondinday / SECONDSPERHOUR;
89  secondinhour = secondinday % SECONDSPERHOUR;
90 
91  /* Calculate minute and second */
92  ptm->tm_min = secondinhour / 60;
93  ptm->tm_sec = secondinhour % 60;
94 
95  return ptm;
96 }
int tm_min
Definition: time.h:70
#define SECONDSPERHOUR
Definition: time.h:9
long dst_end
Definition: timezone.c:17
int tm_mday
Definition: time.h:72
int tm_year
Definition: time.h:74
__u16 time
Definition: mkdosfs.c:366
int tm_mon
Definition: time.h:73
static __inline long leapdays_passed(long days)
Definition: time.h:43
#define SECONDSPERDAY
Definition: time.h:8
unsigned int g_monthdays[13]
Definition: gmtime.c:10
long _dstbias
Definition: timezone.c:62
#define DIFFDAYS
Definition: time.h:2
unsigned int g_lpmonthdays[13]
Definition: gmtime.c:11
int tm_wday
Definition: time.h:75
int tm_yday
Definition: time.h:76
long dst_begin
Definition: timezone.c:16
int tm_sec
Definition: time.h:69
int tm_hour
Definition: time.h:71
static __inline long leapyears_passed(long days)
Definition: time.h:31
int month[12]
Definition: systime.c:13
int tm_isdst
Definition: time.h:77
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31

Referenced by _gmtime32_s(), _gmtime64(), and _gmtime64_s().

◆ gmtime()

struct tm* gmtime ( const time_t ptime)

Definition at line 192 of file gmtime.c.

193 {
194  __time64_t time64;
195 
196  if (!ptime)
197  return NULL;
198  time64 = *ptime;
199  return _gmtime64(&time64);
200 }
struct tm * _gmtime64(const __time64_t *ptime)
Definition: gmtime.c:104
#define NULL
Definition: types.h:112
__MINGW_EXTENSION typedef __int64 __time64_t
Definition: crtdefs.h:385

Variable Documentation

◆ g_lpmonthdays

unsigned int g_lpmonthdays[13] = {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}

Definition at line 11 of file gmtime.c.

Referenced by _gmtime_worker().

◆ g_monthdays

unsigned int g_monthdays[13] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}

Definition at line 10 of file gmtime.c.

Referenced by _gmtime_worker().