Initial revision

src/vmstime.c

+#include "config.h"
+#include "vmstime.h"
+
+long timezone=0;
+int daylight=0;
+
+static char tzname_default[20]="";
+static char tzname_dst[20]="";
+
+char *tzname[2] = { tzname_default, tzname_dst };
+
+static long internal_daylight=0;
+static char daylight_set=0;
+
+static long read_time(const char *nptr, const char **endptr,
+		      int sign_allowed_p)
+{
+  int t;
+
+  *endptr = nptr;
+
+  /* This routine trusts the user very much, and does no checks!
+      The only exception is this: */
+  if (!sign_allowed_p && (*nptr == '-' || *nptr == '+'))
+    return 0;
+
+  t = strtol(*endptr, endptr, 10) * 3600;
+  if (**endptr != ':' || **endptr == '+' || **endptr == '-')
+    return t;
+  (*endptr)++;
+
+  t = t + strtol(*endptr, endptr, 10) * 60;
+  if (**endptr != ':' || **endptr == '+' || **endptr == '-')
+    return t;
+  (*endptr)++;
+
+  return t + strtol(*endptr, endptr, 10);
+}
+
+static void read_dst_time(const char *nptr, const char **endptr,
+			  int *m, int *n, int *d,
+			  int *leap_p)
+{
+  time_t bintim = time(0);
+  struct tm *lc = localtime(&bintim);
+
+  *leap_p = 1;
+  *m = 0;			/* When m and n are 0, a Julian */
+  *n = 0;			/* date has been inserted in d */
+
+  switch(*nptr)
+    {
+    case 'M':
+      {
+	/* This routine counts on the user to have specified "Mm.n.d",
+	   where 1 <= n <= 5, 1 <= m <= 12, 0 <= d <= 6 */
+
+	*m = strtol(++nptr, endptr, 10);
+	(*endptr)++;		/* Skip the dot */
+	*n = strtol(*endptr, endptr, 10);
+	(*endptr)++;		/* Skip the dot */
+	*d = strtol(*endptr, endptr, 10);
+
+	return;
+      }
+    case 'J':
+      *leap_p = 0;		/* Never count with leap years */
+    default: /* trust the user to have inserted a number! */
+      *d = strtol(++nptr, endptr, 10);
+      return;
+    }
+}
+
+struct vms_vectim
+{
+  short year, month, day, hour, minute, second, centi_second;
+};
+static void find_dst_time(int m, int n, long d,
+			  int hour, int minute, int second,
+			  int leap_p,
+			  long vms_internal_time[2])
+{
+  long status = SYS$GETTIM(vms_internal_time);
+  struct vms_vectim vms_vectime;
+  status = SYS$NUMTIM(&vms_vectime, vms_internal_time);
+
+  if (m == 0 && n == 0)
+    {
+      long tmp_vms_internal_time[2][2];
+      long day_of_year;
+      long tmp_operation = LIB$K_DAY_OF_YEAR;
+
+      status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation, &day_of_year,
+					  vms_internal_time);
+      
+      vms_vectime.month = 2;
+      vms_vectime.day = 29;
+      status = LIB$CVT_VECTIM(&vms_vectime, tmp_vms_internal_time[0]);
+      if (status & 1) /* This is a leap year */
+	{
+	  if (!leap_p && d > 59)
+	    d ++;		/* If we don't count with 29th Feb,
+				   and this is a leap year, count up,
+				   to make day 60 really become the
+				   1st March. */
+	}
+      /* 1st January, at midnight */
+      vms_vectime.month = 1;
+      vms_vectime.day = 1;
+      vms_vectime.hour = hour;
+      vms_vectime.minute = minute;
+      vms_vectime.second = second;
+      vms_vectime.centi_second = 0;
+      status = LIB$CVT_VECTIM(&vms_vectime, tmp_vms_internal_time[0]);
+      tmp_operation = LIB$K_DELTA_DAYS;
+      status = LIB$CVT_TO_INTERNAL_TIME(&tmp_operation, &d,
+					tmp_vms_internal_time[1]);
+      /* now, tmp_vms_interval_time[0] contains 1st Jan, 00:00:00,
+	 and  tmp_vms_interval_time[1] contains delta time +d days.
+	 Let's just add them together */
+      status = LIB$ADD_TIMES(tmp_vms_internal_time[0],
+			     tmp_vms_internal_time[1],
+			     vms_internal_time);
+    }
+  else
+    {
+      long tmp_vms_internal_time[2];
+      long day_of_week;
+      long tmp_operation = LIB$K_DAY_OF_YEAR;
+
+      if (d == 0) /* 0 is Sunday, which isn't compatible with VMS,
+		     where day_of_week is 1 -- 7, and 1 is Monday */
+	{
+	  d = 7; /* So a simple conversion is required */
+	}
+      vms_vectime.month = m;
+      vms_vectime.day = 1;
+      vms_vectime.hour = hour;
+      vms_vectime.minute = minute;
+      vms_vectime.second = second;
+      vms_vectime.centi_second = 0;
+      status = LIB$CVT_VECTIM(&vms_vectime, tmp_vms_internal_time);
+      tmp_operation = LIB$K_DAY_OF_WEEK;
+      status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation, &day_of_week,
+					  tmp_vms_internal_time);
+      d -= day_of_week;
+      if (d < 0)
+	{
+	  d += 7;
+	}
+      vms_vectime.day += (n-1)*7 + d;
+      status = LIB$CVT_VECTIM(&vms_vectime, vms_internal_time);
+      if (!(status & 1))
+	{
+	  vms_vectime.day -= 7;	/* n was probably 5 */
+	  status = LIB$CVT_VECTIM(&vms_vectime, vms_internal_time);
+	}
+    }
+}
+
+static cmp_vms_internal_times(long vms_internal_time1[2],
+			      long vms_internal_time2[2])
+{
+  if (vms_internal_time1[1] < vms_internal_time2[1])
+    return -1;
+  else
+    if (vms_internal_time1[1] > vms_internal_time2[1])
+      return 1;
+
+  if (vms_internal_time1[0] < vms_internal_time2[0])
+    return -1;
+  else
+    if (vms_internal_time1[0] > vms_internal_time2[0])
+      return 1;
+
+  return 0;
+}
+
+/* -------------------------- Global routines ------------------------------ */
+
+#ifdef tzset
+#undef tzset
+#endif
+void sys_tzset()
+{
+  char *TZ;
+  char *p, *q;
+
+  if (daylight_set)
+    return;
+
+  daylight = 0;
+
+  if ((TZ = getenv("TZ")) == 0)
+    return;
+
+  p = TZ;
+  q = tzname[0];
+
+  while(*p != '\0'
+	&& (*p <'0' || *p > '9') && *p != '-' && *p != '+' && *p != ',')
+    *q++ = *p++;
+  *q = '\0';
+
+  /* This is special for VMS, so I don't care if it doesn't exist anywhere
+     else */
+
+  timezone = read_time(p, &p, 1);
+
+  q = tzname[1];
+
+  while(*p != '\0'
+	&& (*p <'0' || *p > '9') && *p != '-' && *p != '+' && *p != ',')
+    *q++ = *p++;
+  *q = '\0';
+
+  if (*p != '-' && *p != '+' && !(*p >='0' && *p <= '9'))
+    internal_daylight = timezone - 3600;
+  else
+    internal_daylight = read_time(p, &p, 1);
+
+  if (*p == ',')
+    {
+      int start_m;
+      int start_n;
+      int start_d;
+      int start_leap_p;
+      int start_hour=2, start_minute=0, start_second=0;
+
+      p++;
+      read_dst_time(p, &p, &start_m, &start_n, &start_d, &start_leap_p);
+      if (*p == '/')
+	{
+	  long tmp = read_time (++p, &p, 0);
+	  start_hour = tmp / 3600;
+	  start_minute = (tmp % 3600) / 60;
+	  start_second = tmp % 60;
+	}
+      if (*p == ',')
+	{
+	  int end_m;
+	  int end_n;
+	  int end_d;
+	  int end_leap_p;
+	  int end_hour=2, end_minute=0, end_second=0;
+
+	  p++;
+	  read_dst_time(p, &p, &end_m, &end_n, &end_d, &end_leap_p);
+	  if (*p == '/')
+	    {
+	      long tmp = read_time (++p, &p, 0);
+	      end_hour = tmp / 3600;
+	      end_minute = (tmp % 3600) / 60;
+	      end_second = tmp % 60;
+	    }
+	  {
+	    long vms_internal_time[3][2];
+	    find_dst_time(start_m, start_n, start_d,
+			  start_hour, start_minute, start_second,
+			  start_leap_p,
+			  vms_internal_time[0]);
+	    SYS$GETTIM(&vms_internal_time[1]);
+	    find_dst_time(end_m, end_n, end_d,
+			  end_hour, end_minute, end_second,
+			  end_leap_p,
+			  vms_internal_time[2]);
+	    if (cmp_vms_internal_times(vms_internal_time[0],
+				      vms_internal_time[1]) < 0
+		&& cmp_vms_internal_times(vms_internal_time[1],
+					 vms_internal_time[2]) < 0)
+	      daylight = 1;
+	  }
+	}
+    }
+}  
+
+#ifdef localtime
+#undef localtime
+#endif
+struct tm *sys_localtime(time_t *clock)
+{
+  struct tm *tmp = localtime(clock);
+
+  sys_tzset();
+  tmp->tm_isdst = daylight;
+
+  return tmp;
+}
+
+#ifdef gmtime
+#undef gmtime
+#endif
+struct tm *sys_gmtime(time_t *clock)
+{
+  static struct tm gmt;
+  struct vms_vectim tmp_vectime;
+  long vms_internal_time[3][2];
+  long tmp_operation = LIB$K_DELTA_SECONDS;
+  long status;
+  long tmp_offset;
+  char tmp_o_sign;
+
+  sys_tzset();
+  
+  if (daylight)
+    tmp_offset = internal_daylight;
+  else
+    tmp_offset = timezone;
+
+  if (tmp_offset < 0)
+    {
+      tmp_o_sign = -1;
+      tmp_offset = -tmp_offset;
+    }
+  else
+    tmp_o_sign = 1;
+
+  status = LIB$CVT_TO_INTERNAL_TIME(&tmp_operation, &tmp_offset,
+				    vms_internal_time[1]);
+  status = SYS$GETTIM(vms_internal_time[0]);
+  if (tmp_o_sign < 0)
+    {
+      status = LIB$SUB_TIMES(vms_internal_time[0],
+			     vms_internal_time[1],
+			     vms_internal_time[2]);
+    }
+  else
+    {
+      status = LIB$ADD_TIMES(vms_internal_time[0],
+			     vms_internal_time[1],
+			     vms_internal_time[2]);
+    }
+
+  status = SYS$NUMTIM(&tmp_vectime, vms_internal_time[2]);
+  gmt.tm_sec = tmp_vectime.second;
+  gmt.tm_min = tmp_vectime.minute;
+  gmt.tm_hour = tmp_vectime.hour;
+  gmt.tm_mday = tmp_vectime.day;
+  gmt.tm_mon = tmp_vectime.month - 1;
+  gmt.tm_year = tmp_vectime.year % 100;
+
+  tmp_operation = LIB$K_DAY_OF_WEEK;
+  status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation,
+				      &gmt.tm_wday,
+				      vms_internal_time[2]);
+  if (gmt.tm_wday == 7) gmt.tm_wday = 0;
+
+  tmp_operation = LIB$K_DAY_OF_YEAR;
+  status = LIB$CVT_FROM_INTERNAL_TIME(&tmp_operation,
+				      &gmt.tm_yday,
+				      vms_internal_time[2]);
+  gmt.tm_yday--;
+  gmt.tm_isdst = daylight;
+
+  return &gmt;
+}
+

src/vmstime.h

+#ifndef vmstime_h
+#define vmstime_h
+
+#include <time.h>
+#include <libdtdef.h>
+
+extern long timezone;
+extern int daylight;
+extern char *tzname[2];
+
+void sys_tzset();
+struct tm *sys_localtime(time_t *clock);
+struct tm *sys_gmtime(time_t *clock);
+
+#endif /* vmstime_h */