Brad Smith [Tue, 23 May 2017 01:33:02 +0000 (21:33 -0400)]
ca65 documentation of .define macros, making note that parentheses in ca65 macros are problematic especially when thinking of them as "C style", replacing unclear example with an example showing how accidental parentheses can cause a problem.
Stefan Dorndorf, author of XDOS, pointed out that retrieving the
default device by looking at an undocumented memory location won't
work in future XDOS versions.
He also showed a way to get the default device in a compatible
manner.
This change implements his method and adds a version check (XDOS
versions below 2.4 don't support this -- for them the behaviour
will be the same as, for example, AtariDOS: no notion of a default
drive).
Brad Smith [Tue, 12 Jul 2016 00:48:47 +0000 (20:48 -0400)]
Fix broken rand() implementation. The high 8 bits were unused, reducing it to a 24-bit implementation (while still doing all the work for a 32-bit one). The best entropy is in the unused high byte, returning these bits in A instead of bits 8-15, which had considerably lower entropy (i.e. rand() & 255 was effectively a 16-bit LCG).
Greg King [Sun, 3 Jul 2016 11:07:09 +0000 (07:07 -0400)]
Fixed how ca65 handles some debug info from cc65.
ca65 used to claim that an assembler error/warning was found on a C code line; and, that an Assembly line is only indirectly related to it.
Now, ca65 says that the Assembly line has the problem; and, that the Assembly line was produced from the C line.
Greg King [Sun, 19 Jun 2016 21:38:37 +0000 (17:38 -0400)]
Made the overlay demo programs compile for CBM targets again.
<conio.h> includes target-specific headers; so, we didn't bother to include <cbm.h> where it is needed. But, '#include <conio.h>' was removed from some files; so now, we must include <cbm.h> explicitly.
Oliver Schmidt [Sun, 19 Jun 2016 16:55:00 +0000 (18:55 +0200)]
Improved doc and samples default target.
The 'all' target deliberately doesn't build the doc nor the samples. But that doesn't mean that the Makefiles in the 'doc' and 'samples' directories must default to the (empty) 'all' target.
Oliver Schmidt [Sun, 19 Jun 2016 13:03:20 +0000 (15:03 +0200)]
Added CONIO cursor support.
For quite some time I deliberately didn't add cursor support to the Apple II CONIO imöplementation. I consider it inappropriate to increase the size of cgetc() unduly for a rather seldom used feature.
There's no hardware cursor on the Apple II so displaying a cursor during keyboard input means reading the character stored at the cursor location, writing the cursor character, reading the keyboard and finally writing back the character read initially.
The naive approach is to reuse the part of cputc() that determines the memory location of the character at the cursor position in order to read the character stored there. However that means to add at least one additional JSR / RTS pair to cputc() adding 4 bytes and 12 cycles :-( Apart from that this approach means still a "too" large cgetc().
The approach implemented instead is to include all functionality required by cgetc() into cputc() - which is to read the current character before writing a new one. This may seem surprising at first glance but an LDA(),Y / TAX sequence adds only 3 bytes and 7 cycles so it cheaper than the JSR / RTS pair and allows to brings down the code increase in cgetc() down to a reasonable value.
However so far the internal cputc() code in question saved the X register. Now it uses the X register to return the old character present before writing the new character for cgetc(). This requires some rather small adjustments in other functions using that internal cputc() code.
The final part of exec() called 'excexit' and only then restored the
stack pointer to its value at program entry. 'excexit' does all
cleanup (the same as '_exit()'), which means that on the atarixl
target the ROM is banked in again. On big programs the 'SP_save'
variable might reside at a high memory address which is no longer
accessible after the ROM has been banked in.
The change just moves the restoration of the stack pointer before
the call to 'excexit'.
Another change lets exec.s compile if UCASE_FILENAME is not defined.
And some other small cleanups, also in open.s.
- Adds new ENOEXEC error code, also used by Apple2 targets.
- Maximum command line length is 40, incl. program name. This is
an XDOS restriction.
- testcode/lib/tinyshell.c has been extended to be able to run
programs.
* libsrc/atari/ucase_fn.s: Fix handling if input parameter 'tmp2' is 0.
* libsrc/atari/open.s: Set 'tmp2' parameter for 'ucase_fn' if DEFAULT_DEVICE
is not defined.
Oliver Schmidt [Sun, 5 Jun 2016 12:58:38 +0000 (14:58 +0200)]
Introduced internal gotoxy that pops both parameters.
About all CONIO functions offering a <...>xy variant call
popa
_gotoxy
By providing an internal gotoxy variant that starts with a popa all those CONIO function can be shortened by 3 bytes. As soon as program calls more than one CONIO function this means an overall code size reduction.
Oliver Schmidt [Fri, 3 Jun 2016 09:08:53 +0000 (11:08 +0200)]
Added --print-target-path option.
If cc65 is installed and used as designed there's no need whatsoever for CC65_HOME (both on *IX and Windows) from the perspective of the cc65 binaries. If the user however has to access files from the 'target' directory thenhe ends up with some assumption on the cc65 installation path nevertheless :-(
In order to avoid this I added the --print-target-path option. It "exports" the logic used by the cc65 binaries to locate their files to the user thus allowing him to leverage the same logic to locate the target files in his build scripts / Makefiles.
Oliver Schmidt [Wed, 1 Jun 2016 21:45:27 +0000 (23:45 +0200)]
Removed shell for-loop.
Just a few of the many reasons why shell for-loops have no place in (GNUmake) Makefiles:
* They don't conform to https://www.gnu.org/software/make/manual/html_node/Utilities-in-Makefiles.html
* They break Windows builds for sure
* They don't fit to make's approach of working with sets
* They break make parallelism
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