Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

sdk/lib/crt/time/timezone.c

@@ -0,0 +1,251 @@
+/*
+ * COPYRIGHT:   LGPL, See LGPL.txt in the top level directory
+ * PROJECT:     ReactOS CRT library
+ * FILE:        lib/sdk/crt/time/timezone.c
+ * PURPOSE:     Implementation of time zone functions
+ * PROGRAMERS:  Timo Kreuzer
+ */
+#include "precomp.h"
+
+char _tz_is_set = 0;
+
+/* buffers must hold 64 characters! */
+static char tz_name[64] = "PST";
+static char tz_dst_name[64] = "PDT";
+
+long dst_begin = 0;
+long dst_end = 0;
+
+/******************************************************************************
+ * \var _tzname
+ */
+char * _tzname[2] = {
+  tz_name,
+  tz_dst_name,
+};
+
+/******************************************************************************
+ * \var _daylight
+ */
+int _daylight = 0;
+
+/******************************************************************************
+ * \name __p__daylight
+ * \brief Returns a pointer to the _daylight variable;
+ */
+void *
+__p__daylight(void)
+{
+   return &_daylight;
+}
+
+/******************************************************************************
+ * \var _timezone
+ * \brief
+ */
+long _timezone = 28800;
+
+/******************************************************************************
+ * \name __p__timezone
+ * \brief Returns a pointer to the _timezone variable;
+ */
+long *
+__p__timezone(void)
+{
+   return &_timezone;
+}
+
+/******************************************************************************
+ * \var _dstbias
+ * \brief
+ */
+long _dstbias = 0;
+
+/******************************************************************************
+ * \name __p__dstbias
+ * \brief Returns a pointer to the _dstbias variable;
+ */
+long *
+__p__dstbias(void)
+{
+    return &_dstbias;
+}
+
+/******************************************************************************
+ * \name __p__tzname
+ * \brief Returns a pointer to the _tzname buffer;
+ */
+char **
+__p__tzname(void)
+{
+    return _tzname;
+}
+
+/******************************************************************************
+ * \name _tzset
+ * \brief Initializes the variables _daylight, _timezone, and _tzname from the
+ *        "TZ" environment variable if available or else by calling
+ *        GetTimeZoneInformation.
+ * \sa http://msdn.microsoft.com/en-us/library/90s5c885.aspx
+ */
+void
+_tzset(void)
+{
+    const char * str;
+
+    if (_tz_is_set)
+    {
+        return;
+    }
+
+    /* Try to read the timezone from environment */
+    str = getenv("TZ");
+    if (str && str[0] != 0)
+    {
+        long hour = 0, min = 0, sec = 0;
+        size_t len = strnlen(str, 16);
+        int sign = 1;
+
+        dst_begin = 0;
+
+        for (;;)
+        {
+            /* Copy timezone name */
+            strncpy(tz_name, str, 3);
+            str += 3;
+            len -= 3;
+
+            if (len < 1) break;
+
+            if (*str == '+' || *str == '-')
+            {
+                sign = *str == '-' ? -1 : 1;
+                str++;
+                len--;
+            }
+
+            if (len < 1) break;
+
+            hour = atol(str);
+
+            while (*str != 0 && *str != ':') str++;
+            if (*str == 0) break;
+
+            min = atol(++str);
+
+            while (*str != 0 && *str != ':') str++;
+            if (*str == 0) break;
+
+            sec = atol(++str);
+
+            while (*str != 0 && *str <= '9') str++;
+            if (*str == 0) break;
+
+            /* Copy DST name */
+            strncpy(tz_dst_name, str, 3);
+
+            // FIXME: set dst_begin etc
+
+            /* We are finished */
+            break;
+        }
+
+        _timezone = sign * (((hour * 60) + min) * 60 + sec);
+
+    }
+    else
+    {
+        TIME_ZONE_INFORMATION tzi;
+        DWORD ret;
+
+        ret = GetTimeZoneInformation(&tzi);
+        if (ret == TIME_ZONE_ID_INVALID)
+        {
+            return;
+        }
+
+        ret = WideCharToMultiByte(CP_ACP,
+                                  0,
+                                  tzi.StandardName,
+                                  -1,
+                                  tz_name,
+                                  sizeof(tz_name),
+                                  NULL,
+                                  NULL);
+
+        ret = WideCharToMultiByte(CP_ACP,
+                                  0,
+                                  tzi.DaylightName,
+                                  -1,
+                                  tz_dst_name,
+                                  sizeof(tz_dst_name),
+                                  NULL,
+                                  NULL);
+
+        _timezone = tzi.Bias * 60;
+
+        if (tzi.DaylightDate.wMonth)
+        {
+            struct tm _tm;
+
+            _daylight = 1;
+            _dstbias = (tzi.DaylightBias - tzi.StandardBias) * 60;
+            _tm.tm_year = 70;
+            _tm.tm_mon = tzi.DaylightDate.wMonth - 1;
+            _tm.tm_mday = tzi.DaylightDate.wDay;
+            _tm.tm_hour = tzi.DaylightDate.wHour;
+            _tm.tm_min = tzi.DaylightDate.wMinute;
+            _tm.tm_sec = tzi.DaylightDate.wSecond;
+            dst_begin = (long)_mkgmtime(&_tm);
+            _tm.tm_mon = tzi.StandardDate.wMonth - 1;
+            _tm.tm_mday = tzi.StandardDate.wDay;
+            _tm.tm_hour = tzi.StandardDate.wHour;
+            _tm.tm_min = tzi.StandardDate.wMinute;
+            _tm.tm_sec = tzi.StandardDate.wSecond;
+            dst_end = (long)_mkgmtime(&_tm);
+        }
+        else
+        {
+            _daylight = 0;
+            _dstbias = 0;
+        }
+
+    }
+    _tz_is_set = 1;
+}
+
+/*********************************************************************
+ *		_get_tzname (MSVCRT.@)
+ */
+int CDECL _get_tzname(size_t *ret, char *buf, size_t bufsize, int index)
+{
+    char *str_timezone;
+
+    switch (index)
+    {
+    case 0:
+        str_timezone = tz_name;
+        break;
+
+    case 1:
+        str_timezone = tz_dst_name;
+        break;
+
+    default:
+        *_errno() = EINVAL;
+        return EINVAL;
+    }
+
+    if (!ret || (!buf && (bufsize > 0)) || (buf && !bufsize))
+    {
+        *_errno() = EINVAL;
+        return EINVAL;
+    }
+
+    *ret = strlen(str_timezone) + 1;
+    if(!buf && !bufsize)
+        return 0;
+
+    strncpy(buf, str_timezone, bufsize);
+    return 0;
+}