Initial revision

13 files changed, 634 insertions, 0 deletions

diff --git a/libc/misc/time/Makefile b/libc/misc/time/Makefile
new file mode 100644
index 000000000..ab47a7e47
--- /dev/null
+++ b/libc/misc/time/Makefile
@@ -0,0 +1,24 @@
+# Copyright (C) 1996 Robert de Bath <robert@mayday.compulink.co.uk>
+# This file is part of the Linux-8086 C library and is distributed
+# under the GNU Library General Public License.
+
+LIBC=../libc.a
+
+CC=m68k-pic-coff-gcc
+AR=m68k-pic-coff-ar
+RANLIB=m68k-pic-coff-ranlib
+
+CCFLAGS= -O2 -m68000 -msoft-float -I../include
+
+OBJ=localtime.o gmtime.o asctime.o ctime.o asc_conv.o tm_conv.o mktime.o \
+	localtime_r.o gmtime_r.o asctime_r.o ctime_r.o
+
+CFLAGS=$(ARCH) $(CCFLAGS) $(DEFS)
+
+all: $(LIBC)
+	@$(RM) $(OBJ)
+
+$(LIBC): $(LIBC)($(OBJ))
+
+clean:
+	rm -f *.o libc.a
diff --git a/libc/misc/time/README b/libc/misc/time/README
new file mode 100644
index 000000000..da4f4e67f
--- /dev/null
+++ b/libc/misc/time/README
@@ -0,0 +1,8 @@
+Copyright (C) 1996 Robert de Bath <robert@mayday.compulink.co.uk>
+This file is part of the Linux-8086 C library and is distributed
+under the GNU Library General Public License.
+
+There are two ways of converting the time_t to a struct tm, I'm not
+quite sure which is better.
+
+-Robert
diff --git a/libc/misc/time/asc_conv.c b/libc/misc/time/asc_conv.c
new file mode 100644
index 000000000..78cbcdd8d
--- /dev/null
+++ b/libc/misc/time/asc_conv.c
@@ -0,0 +1,49 @@
+
+#include <time.h>
+#include <string.h>
+/*
+ * Internal ascii conversion routine, avoid use of printf, it's a bit big!
+ */
+
+
+static void
+hit(buf, val)
+char * buf;
+int val;
+{
+   *buf = '0' + val%10;
+}
+
+void
+__asctime(buffer, ptm)
+register char * buffer;
+struct tm * ptm;
+{
+static char days[] = "SunMonTueWedThuFriSat";
+static char mons[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
+   int year;
+
+   /*              012345678901234567890123456 */
+   strcpy(buffer, "Err Err .. ..:..:.. ....\n");
+   if( (ptm->tm_wday >= 0) && (ptm->tm_wday <= 6) )
+     memcpy(buffer, days+3*(ptm->tm_wday), 3);
+
+   if( (ptm->tm_mon >= 0) && (ptm->tm_mon <= 11) )
+     memcpy(buffer+4, mons+3*(ptm->tm_mon), 3);
+
+
+   hit(buffer+ 8, ptm->tm_mday/10);
+   hit(buffer+ 9, ptm->tm_mday   );
+   hit(buffer+11, ptm->tm_hour/10);
+   hit(buffer+12, ptm->tm_hour   );
+   hit(buffer+14, ptm->tm_min/10);
+   hit(buffer+15, ptm->tm_min   );
+   hit(buffer+17, ptm->tm_sec/10);
+   hit(buffer+18, ptm->tm_sec   );
+
+   year = ptm->tm_year + 1900;
+   hit(buffer+20, year/1000);
+   hit(buffer+21, year/100);
+   hit(buffer+22, year/10);
+   hit(buffer+23, year);
+}
diff --git a/libc/misc/time/asctime.c b/libc/misc/time/asctime.c
new file mode 100644
index 000000000..08673cbcc
--- /dev/null
+++ b/libc/misc/time/asctime.c
@@ -0,0 +1,15 @@
+
+#include <time.h>
+
+extern void __asctime();
+
+char *
+asctime(timeptr)
+__const struct tm * timeptr;
+{
+   static char timebuf[26];
+
+   if( timeptr == 0 ) return 0;
+   __asctime(timebuf, timeptr);
+   return timebuf;
+}
diff --git a/libc/misc/time/asctime_r.c b/libc/misc/time/asctime_r.c
new file mode 100644
index 000000000..ff2b6bfb3
--- /dev/null
+++ b/libc/misc/time/asctime_r.c
@@ -0,0 +1,15 @@
+
+#include <time.h>
+
+extern void __asctime();
+
+char *
+asctime_r(timeptr, buf)
+__const struct tm * timeptr;
+char * buf;
+{
+
+   if( timeptr == 0 ) return 0;
+   __asctime(buf, timeptr);
+   return buf;
+}
diff --git a/libc/misc/time/ctime.c b/libc/misc/time/ctime.c
new file mode 100644
index 000000000..2f42cd3f3
--- /dev/null
+++ b/libc/misc/time/ctime.c
@@ -0,0 +1,26 @@
+
+#include <time.h>
+
+extern void __tm_conv();
+extern void __asctime();
+
+char *
+ctime(timep)
+__const time_t * timep;
+{
+  static char cbuf[26];
+  struct tm tmb;
+  struct timezone tz;
+  time_t offt;
+  
+  gettimeofday((void*)0, &tz);
+  
+  offt = -tz.tz_minuteswest*60L;
+  
+  /* tmb.tm_isdst = ? */
+  __tm_conv(&tmb, timep, offt);
+  
+  __asctime(cbuf, &tmb);
+  
+  return cbuf;
+}
diff --git a/libc/misc/time/ctime_r.c b/libc/misc/time/ctime_r.c
new file mode 100644
index 000000000..ac267b04e
--- /dev/null
+++ b/libc/misc/time/ctime_r.c
@@ -0,0 +1,26 @@
+
+#include <time.h>
+
+extern void __tm_conv();
+extern void __asctime();
+
+char *
+ctime_r(timep, buf)
+__const time_t * timep;
+char * buf;
+{
+  struct tm tmb;
+  struct timezone tz;
+  time_t offt;
+  
+  gettimeofday((void*)0, &tz);
+  
+  offt = -tz.tz_minuteswest*60L;
+  
+  /* tmb.tm_isdst = ? */
+  __tm_conv(&tmb, timep, offt);
+  
+  __asctime(buf, &tmb);
+  
+  return buf;
+}
diff --git a/libc/misc/time/gmtime.c b/libc/misc/time/gmtime.c
new file mode 100644
index 000000000..69d539392
--- /dev/null
+++ b/libc/misc/time/gmtime.c
@@ -0,0 +1,16 @@
+
+#include <time.h>
+
+extern void __tm_conv();
+
+struct tm *
+gmtime(timep)
+__const time_t * timep;
+{
+   static struct tm tmb;
+
+   __tm_conv(&tmb, timep, 0L);
+
+   return &tmb;
+}
+
diff --git a/libc/misc/time/gmtime_r.c b/libc/misc/time/gmtime_r.c
new file mode 100644
index 000000000..00c41b349
--- /dev/null
+++ b/libc/misc/time/gmtime_r.c
@@ -0,0 +1,14 @@
+
+#include <time.h>
+
+extern void __tm_conv();
+
+struct tm *
+gmtime_r(timep, tp)
+__const time_t * timep;
+struct tm * tp;
+{
+   __tm_conv(tp, timep, 0L);
+   return tp;
+}
+
diff --git a/libc/misc/time/localtime.c b/libc/misc/time/localtime.c
new file mode 100644
index 000000000..9d9b46d15
--- /dev/null
+++ b/libc/misc/time/localtime.c
@@ -0,0 +1,22 @@
+
+#include <time.h>
+
+extern void __tm_conv();
+
+struct tm *
+localtime(timep)
+__const time_t * timep;
+{
+   static struct tm tmb;
+   struct timezone tz;
+   time_t offt;
+
+   gettimeofday((void*)0, &tz);
+
+   offt = -tz.tz_minuteswest*60L;
+
+   /* tmb.tm_isdst = ? */
+   __tm_conv(&tmb, timep, offt);
+
+   return &tmb;
+}
diff --git a/libc/misc/time/localtime_r.c b/libc/misc/time/localtime_r.c
new file mode 100644
index 000000000..fe024670c
--- /dev/null
+++ b/libc/misc/time/localtime_r.c
@@ -0,0 +1,22 @@
+
+#include <time.h>
+
+extern void __tm_conv();
+
+struct tm *
+localtime_r(timep, tp)
+__const time_t * timep;
+struct tm * tp;
+{
+   struct timezone tz;
+   time_t offt;
+
+   gettimeofday((void*)0, &tz);
+
+   offt = -tz.tz_minuteswest*60L;
+
+   /* tmb.tm_isdst = ? */
+   __tm_conv(tp, timep, offt);
+
+   return tp;
+}
diff --git a/libc/misc/time/mktime.c b/libc/misc/time/mktime.c
new file mode 100644
index 000000000..7f7aabcd7
--- /dev/null
+++ b/libc/misc/time/mktime.c
@@ -0,0 +1,259 @@
+
+/* This is adapted from glibc */
+/* Copyright (C) 1993, 1994, 1995, 1996, 1997 Free Software Foundation, Inc. */
+
+
+/* Assume that leap seconds are possible, unless told otherwise.
+   If the host has a `zic' command with a -L leapsecondfilename' option,
+   then it supports leap seconds; otherwise it probably doesn't.  */
+#ifndef LEAP_SECONDS_POSSIBLE
+#define LEAP_SECONDS_POSSIBLE 1
+#endif
+
+#include <sys/types.h>          /* Some systems define `time_t' here.  */
+#include <time.h>
+
+#if __STDC__ || __GNU_LIBRARY__ || STDC_HEADERS
+#include <limits.h>
+#endif
+
+#if DEBUG
+#include <stdio.h>
+#if __STDC__ || __GNU_LIBRARY__ || STDC_HEADERS
+#include <stdlib.h>
+#endif
+/* Make it work even if the system's libc has its own mktime routine.  */
+#define mktime my_mktime
+#endif /* DEBUG */
+
+#ifndef __P
+#if defined (__GNUC__) || (defined (__STDC__) && __STDC__)
+#define __P(args) args
+#else
+#define __P(args) ()
+#endif  /* GCC.  */
+#endif  /* Not __P.  */
+
+#ifndef CHAR_BIT
+#define CHAR_BIT 8
+#endif
+
+#ifndef INT_MIN
+#define INT_MIN (~0 << (sizeof (int) * CHAR_BIT - 1))
+#endif
+#ifndef INT_MAX
+#define INT_MAX (~0 - INT_MIN)
+#endif
+
+#ifndef TIME_T_MIN
+#define TIME_T_MIN (0 < (time_t) -1 ? (time_t) 0 \
+                    : ~ (time_t) 0 << (sizeof (time_t) * CHAR_BIT - 1))
+#endif
+#ifndef TIME_T_MAX
+#define TIME_T_MAX (~ (time_t) 0 - TIME_T_MIN)
+#endif
+
+#define TM_YEAR_BASE 1900
+#define EPOCH_YEAR 1970
+
+#ifndef __isleap
+/* Nonzero if YEAR is a leap year (every 4 years,
+   except every 100th isn't, and every 400th is).  */
+#define __isleap(year)  \
+  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+#endif
+
+/* How many days come before each month (0-12).  */
+const unsigned short int __mon_yday[2][13] =
+  {
+    /* Normal years.  */
+    { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+    /* Leap years.  */
+    { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+  };
+
+static time_t ydhms_tm_diff __P ((int, int, int, int, int, const struct tm *));
+time_t __mktime_internal __P ((struct tm *,
+                               struct tm *(*) (const time_t *, struct tm *),
+                               time_t *));
+
+/* Yield the difference between (YEAR-YDAY HOUR:MIN:SEC) and (*TP),
+   measured in seconds, ignoring leap seconds.
+   YEAR uses the same numbering as TM->tm_year.
+   All values are in range, except possibly YEAR.
+   If overflow occurs, yield the low order bits of the correct answer.  */
+static time_t
+ydhms_tm_diff (year, yday, hour, min, sec, tp)
+     int year, yday, hour, min, sec;
+     const struct tm *tp;
+{
+  /* Compute intervening leap days correctly even if year is negative.
+     Take care to avoid int overflow.  time_t overflow is OK, since
+     only the low order bits of the correct time_t answer are needed.
+     Don't convert to time_t until after all divisions are done, since
+     time_t might be unsigned.  */
+  int a4 = (year >> 2) + (TM_YEAR_BASE >> 2) - ! (year & 3);
+  int b4 = (tp->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (tp->tm_year & 3);
+  int a100 = a4 / 25 - (a4 % 25 < 0);
+  int b100 = b4 / 25 - (b4 % 25 < 0);
+  int a400 = a100 >> 2;
+  int b400 = b100 >> 2;
+  int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
+  time_t years = year - (time_t) tp->tm_year;
+  time_t days = (365 * years + intervening_leap_days
+                 + (yday - tp->tm_yday));
+  return (60 * (60 * (24 * days + (hour - tp->tm_hour))
+                + (min - tp->tm_min))
+          + (sec - tp->tm_sec));
+}
+
+
+static time_t localtime_offset;
+
+
+/* Convert *TP to a time_t value.  */
+time_t
+mktime (tp)
+     struct tm *tp;
+{
+#ifdef _LIBC
+  /* POSIX.1 8.1.1 requires that whenever mktime() is called, the
+     time zone names contained in the external variable `tzname' shall
+     be set as if the tzset() function had been called.  */
+  __tzset ();
+#endif
+
+  return __mktime_internal (tp, localtime_r, &localtime_offset);
+}
+
+/* Convert *TP to a time_t value, inverting
+   the monotonic and mostly-unit-linear conversion function CONVERT.
+   Use *OFFSET to keep track of a guess at the offset of the result,
+   compared to what the result would be for UTC without leap seconds.
+   If *OFFSET's guess is correct, only one CONVERT call is needed.  */
+time_t
+__mktime_internal (tp, convert, offset)
+     struct tm *tp;
+     struct tm *(*convert) __P ((const time_t *, struct tm *));
+     time_t *offset;
+{
+  time_t t, dt, t0;
+  struct tm tm;
+
+  /* The maximum number of probes (calls to CONVERT) should be enough
+     to handle any combinations of time zone rule changes, solar time,
+     and leap seconds.  Posix.1 prohibits leap seconds, but some hosts
+     have them anyway.  */
+  int remaining_probes = 4;
+
+  /* Time requested.  Copy it in case CONVERT modifies *TP; this can
+     occur if TP is localtime's returned value and CONVERT is localtime.  */
+  int sec = tp->tm_sec;
+  int min = tp->tm_min;
+  int hour = tp->tm_hour;
+  int mday = tp->tm_mday;
+  int mon = tp->tm_mon;
+  int year_requested = tp->tm_year;
+  int isdst = tp->tm_isdst;
+
+  /* Ensure that mon is in range, and set year accordingly.  */
+  int mon_remainder = mon % 12;
+  int negative_mon_remainder = mon_remainder < 0;
+  int mon_years = mon / 12 - negative_mon_remainder;
+  int year = year_requested + mon_years;
+
+  /* The other values need not be in range:
+     the remaining code handles minor overflows correctly,
+     assuming int and time_t arithmetic wraps around.
+     Major overflows are caught at the end.  */
+
+  /* Calculate day of year from year, month, and day of month.
+     The result need not be in range.  */
+  int yday = ((__mon_yday[__isleap (year + TM_YEAR_BASE)]
+               [mon_remainder + 12 * negative_mon_remainder])
+              + mday - 1);
+
+#if LEAP_SECONDS_POSSIBLE
+  /* Handle out-of-range seconds specially,
+     since ydhms_tm_diff assumes every minute has 60 seconds.  */
+  int sec_requested = sec;
+  if (sec < 0)
+    sec = 0;
+  if (59 < sec)
+    sec = 59;
+#endif
+
+  /* Invert CONVERT by probing.  First assume the same offset as last time.
+     Then repeatedly use the error to improve the guess.  */
+
+  tm.tm_year = EPOCH_YEAR - TM_YEAR_BASE;
+  tm.tm_yday = tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+  t0 = ydhms_tm_diff (year, yday, hour, min, sec, &tm);
+
+  for (t = t0 + *offset;
+       (dt = ydhms_tm_diff (year, yday, hour, min, sec, (*convert) (&t, &tm)));
+       t += dt)
+    if (--remaining_probes == 0)
+      return -1;
+
+  /* Check whether tm.tm_isdst has the requested value, if any.  */
+  if (0 <= isdst && 0 <= tm.tm_isdst)
+    {
+      int dst_diff = (isdst != 0) - (tm.tm_isdst != 0);
+      if (dst_diff)
+        {
+          /* Move two hours in the direction indicated by the disagreement,
+             probe some more, and switch to a new time if found.
+             The largest known fallback due to daylight savings is two hours:
+             once, in Newfoundland, 1988-10-30 02:00 -> 00:00.  */
+          time_t ot = t - 2 * 60 * 60 * dst_diff;
+          while (--remaining_probes != 0)
+            {
+              struct tm otm;
+              if (! (dt = ydhms_tm_diff (year, yday, hour, min, sec,
+                                         (*convert) (&ot, &otm))))
+                {
+                  t = ot;
+                  tm = otm;
+                  break;
+                }
+              if ((ot += dt) == t)
+                break;  /* Avoid a redundant probe.  */
+            }
+        }
+    }
+
+  *offset = t - t0;
+
+#if LEAP_SECONDS_POSSIBLE
+  if (sec_requested != tm.tm_sec)
+    {
+      /* Adjust time to reflect the tm_sec requested, not the normalized value.
+         Also, repair any damage from a false match due to a leap second.  */
+      t += sec_requested - sec + (sec == 0 && tm.tm_sec == 60);
+      (*convert) (&t, &tm);
+    }
+#endif
+
+#if 0
+  if (TIME_T_MAX / INT_MAX / 366 / 24 / 60 / 60 < 3)
+    {
+      /* time_t isn't large enough to rule out overflows in ydhms_tm_diff,
+         so check for major overflows.  A gross check suffices,
+         since if t has overflowed, it is off by a multiple of
+         TIME_T_MAX - TIME_T_MIN + 1.  So ignore any component of
+         the difference that is bounded by a small value.  */
+
+      double dyear = (double) year_requested + mon_years - tm.tm_year;
+      double dday = 366 * dyear + mday;
+      double dsec = 60 * (60 * (24 * dday + hour) + min) + sec_requested;
+
+      if (TIME_T_MAX / 3 - TIME_T_MIN / 3 < (dsec < 0 ? - dsec : dsec))
+        return -1;
+    }
+#endif
+
+  *tp = tm;
+  return t;
+}
+
diff --git a/libc/misc/time/tm_conv.c b/libc/misc/time/tm_conv.c
new file mode 100644
index 000000000..ffd524c4b
--- /dev/null
+++ b/libc/misc/time/tm_conv.c
@@ -0,0 +1,138 @@
+
+#if 0
+#include <time.h>
+
+/* This is a translation from ALGOL in Collected Algorithms of CACM. */
+/* Copied from Algorithm 199, Author: Robert G. Tantzen */
+
+void
+__tm_conv(tmbuf, timep, offset)
+struct tm *tmbuf;
+time_t *timep;
+time_t offset;
+{
+static int   moffset[] =
+   {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+
+   long s;
+   long  j, d, m, y;
+
+   offset += *timep;
+
+   tmbuf->tm_isdst = 0;		/* Someone else can set this */
+
+   j = offset / 86400L + 719469;
+   s = offset % 86400L;
+
+   if( s < 0 ) { s += 86400L; j--; }
+
+   tmbuf->tm_sec = s % 60;
+   tmbuf->tm_min = (s / 60) % 60;
+   tmbuf->tm_hour = s / 3600;
+
+   tmbuf->tm_wday = (j+2) % 7;
+
+   /*
+    * Julian date converter. Takes a julian date (the number of days since
+    * some distant epoch or other), and fills tmbuf.
+    */
+
+   y = (4L * j - 1L) / 146097L;
+   j = 4L * j - 1L - 146097L * y;
+   d = j / 4L;
+   j = (4L * d + 3L) / 1461L;
+   d = 4L * d + 3L - 1461L * j;
+   d = (d + 4L) / 4L;
+   m = (5L * d - 3L) / 153L;
+   d = 5L * d - 3 - 153L * m;
+   d = (d + 5L) / 5L;
+   y = 100L * y + j;
+   if (m < 10)
+      m += 2;
+   else
+   {
+      m -= 10;
+      ++y;
+   }
+
+   tmbuf->tm_year = y - 1900;
+   tmbuf->tm_mon = m;
+   tmbuf->tm_mday = d;
+
+   tmbuf->tm_yday = d + moffset[m];
+   if (m > 1 && ((y) % 4 == 0 && ((y) % 100 != 0 || (y) % 400 == 0)))
+      tmbuf->tm_yday++;
+}
+
+#else
+
+/* This is adapted from glibc */
+/* Copyright (C) 1991, 1993 Free Software Foundation, Inc */
+
+#define SECS_PER_HOUR 3600L
+#define SECS_PER_DAY  86400L
+
+#include <time.h>
+
+static const unsigned short int __mon_lengths[2][12] =
+  {
+    /* Normal years.  */
+    { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+    /* Leap years.  */
+    { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+  };
+
+
+void
+__tm_conv(tmbuf, t, offset)
+struct tm *tmbuf;
+time_t *t;
+time_t offset;
+{
+  long days, rem;
+  register int y;
+  register unsigned short int *ip;
+
+  days = *t / SECS_PER_DAY;
+  rem = *t % SECS_PER_DAY;
+  rem += offset;
+  while (rem < 0)
+    {
+      rem += SECS_PER_DAY;
+      --days;
+    }
+  while (rem >= SECS_PER_DAY)
+    {
+      rem -= SECS_PER_DAY;
+      ++days;
+    }
+  tmbuf->tm_hour = rem / SECS_PER_HOUR;
+  rem %= SECS_PER_HOUR;
+  tmbuf->tm_min = rem / 60;
+  tmbuf->tm_sec = rem % 60;
+  /* January 1, 1970 was a Thursday.  */
+  tmbuf->tm_wday = (4 + days) % 7;
+  if (tmbuf->tm_wday < 0)
+    tmbuf->tm_wday += 7;
+  y = 1970;
+  while (days >= (rem = __isleap(y) ? 366 : 365))
+    {
+      ++y;
+      days -= rem;
+    }
+  while (days < 0)
+    {
+      --y;
+      days += __isleap(y) ? 366 : 365;
+    }
+  tmbuf->tm_year = y - 1900;
+  tmbuf->tm_yday = days;
+  ip = __mon_lengths[__isleap(y)];
+  for (y = 0; days >= ip[y]; ++y)
+    days -= ip[y];
+  tmbuf->tm_mon = y;
+  tmbuf->tm_mday = days + 1;
+  tmbuf->tm_isdst = -1;
+}
+
+#endif