Oliver Schmidt [Fri, 17 Aug 2018 23:13:02 +0000 (01:13 +0200)]
Added clock_settime() for some CBMs.
The CIA TOD only stores the time but not the date. Therefore the date set by clock_settime() ist just stored inside the C library for retrieval via clock_gettime().
The "very special" handling of 12AM/PM is based on https://groups.google.com/d/msg/comp.sys.cbm/ysVYSX4AMbc/vHrXCWEhCOUJ saying:
1. column ("24hr"): hour to be tested (decimal)
2. column ("Wr"): hour written to TOD register (BCD)
3. column ("Rd"): hour read from TOD register (BCD) immediately after writing the value in column 2 to see the conversion between AM/PM, if any
4. column ("Nx"): next hour (BCD) after the hour switch
Oliver Schmidt [Fri, 17 Aug 2018 22:13:38 +0000 (00:13 +0200)]
Fixed 12 AM/PM handling.
Midnight is 12 AM and noon is 12 PM (see https://en.wikipedia.org/wiki/12-hour_clock). Therefore we need to subtract 12 hours in exactly those two hours.
sim65/paravirt.c: In function ‘PVOpen’:
sim65/paravirt.c:217:18: error: ‘S_IREAD’ undeclared (first use in this function)
OMode |= S_IREAD;
^
sim65/paravirt.c:217:18: note: each undeclared identifier is reported only once for each function it appears in
sim65/paravirt.c:220:18: error: ‘S_IWRITE’ undeclared (first use in this function)
OMode |= S_IWRITE;
^
make[1]: *** [../wrk/sim65/paravirt.o] Error 1
Files created by my programs running under sim65 had really weird permissions:
--w-r--r-x 1 ppelleti staff 19 Aug 16 23:22 json.test.print.tmp
So, for example, my program running under sim65 was not able to read
the file it had just written.
This is because the third argument to open (mode) was not being
specified in paravirt.c, so it was just picking up random crud off the
stack to use as the mode.
I added a mode of 0666, and now my program runs correctly.
Oliver Schmidt [Wed, 15 Aug 2018 19:34:35 +0000 (21:34 +0200)]
Added clock_getres() / clock_settime() for the Apple II.
The situation on the Apple II is rather special: There are several types of RTCs. It's not desirable to have specific code for all of them. As the OS supports file timestamps RTC owners usually use OS drivers for their RTC. Those drivers read the RTC and write the result in a "date/time location" in RAM. The OS reads the date/time from the RAM location. If there's no RTC the RAM location keeps containing zeros. The OS uses those zeros as timestamps and the files show up in a directory as "<NO DATE>".
There's no common interface to set RTCs so if an RTC _IS_ present there's just nothing to do. However, if there's _NO_ RTC present the user might very well be interest to "manually" set the RAM location in order to have timestamps. But he surely doesn't want to manually set the RAM location over an over again. Rather he wants to set it just once after booting the OS.
From that perspective it makes most sense to not set both the date and the time but rather only set the date and have the time just stay zero. Then files show up in a directory as "DD-MON-YY 0:00".
So clock_settime() checks if the current time equals 0:00. If it does _NOT_ then an RTC is supposed to be active and clock_settime() fails with ERANGE. Otherwise clock_settime() ignores sets the date - and completely ignores the time provided as parameter.
clock_getres() too checks if the current time equals 0:00. If it does _NOT_ then an RTC is supposed to be active and clock_getres() returns a time resolution of one minute. Otherwise clock_getres() presumes that the only one who sets the RAM location is clock_settime() and therefore returns a time resolution of one day.
Oliver Schmidt [Wed, 15 Aug 2018 13:59:11 +0000 (15:59 +0200)]
Replaced _systime with clock_gettime.
We want to add the capability to not only get the time but also set the time, but there's no "setter" for the "getter" time().
The first ones that come into mind are gettimeofday() and settimeofday(). However, they take a struct timezone argument that doesn't make sense - even the man pages says "The use of the timezone structure is obsolete; the tz argument should normally be specified as NULL." And POSIX says "Applications should use the clock_gettime() function instead of the obsolescent gettimeofday() function."
The ...timeofday() functions work with microseconds while the clock_...time() functions work with nanoseconds. Given that we expect our targets to support only 1/10 of seconds the microseconds look preferable at first sight. However, already microseconds require the cc65 data type 'long' so it's not such a relevant difference to nanoseconds. Additionally clock_getres() seems useful.
In order to avoid code duplication clock_gettime() takes over the role of the actual time getter from _systime(). So time() now calls clock_gettime() instead of _systime().
For some reason beyond my understanding _systime() was mentioned in time.h. _systime() worked exactly like e.g. _sysremove() and those _sys...() functions are all considered internal. The only reason I could see would be a performance gain of bypassing the time() wrapper. However, all known _systime() implementations internally called mktime(). And mktime() is implemented in C using an iterative algorithm so I really can't see what would be left to gain here. From that perspective I decided to just remove _systime().
Oliver Schmidt [Thu, 2 Aug 2018 15:12:12 +0000 (17:12 +0200)]
"Inverted" time_t value handling.
So far time_t values were interpreted as local time values. However, usually time_t values are to be interpreted as "seconds since 1 Jan 1970 in UTC". Therefore all logic handling time_t values has to be changed.
- So far gmtime() called localtime() with an adjusted time_t, now localtime() calls gmtime() with an adjusted time_t.
- mktime() has to do "the opposite" of localtime(), to keep it that way mktime() does now the inverse adjustment made by localtime().
- All currently present time() implementations internally call mktime() so they don't require individual adjustments.
Oliver Schmidt [Thu, 2 Aug 2018 13:45:57 +0000 (15:45 +0200)]
Increased consistency.
The test program works as-is only if the timezone isn't set (to something different than UTC). However, using localtime() instead of gmtime() makes it at least consistent in that the original time (given to mktime()) is identical to the time retrieved.
Oliver Schmidt [Fri, 8 Jun 2018 17:16:18 +0000 (19:16 +0200)]
Allow spaces in path names.
The Microsoft C Library needs to have spawnvp() parameters with spaces quoted manually. We do this only if actually necessary to limit issues with parameters already containing double quotes.
Oliver Schmidt [Fri, 8 Jun 2018 16:58:36 +0000 (18:58 +0200)]
Use --print-target-path only as last resort.
--print-target-path may return a path with (escaped) spaces. We'll use that path with $(wildcard ...), that's fine. But then we use the outcome with $(foreach ...) and there things fail badly and there's nothing to do about it.
Therefore we a) try to avoid --print-target-path in the first place and b) explicitly bail out if we end up with spaces.
Oliver Schmidt [Thu, 7 Jun 2018 15:10:33 +0000 (17:10 +0200)]
Escape spaces in target path.
cc65 escapes spaces in paths it writes to dependency files (see WriteEscaped() in cc65/input.c). Given that the output of OptPrintTargetPath() is supposed to be used in Makefiles in pretty much the same way it is appropriate to escape spaces here too.
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