add some conio functions

libsrc/atari5200/cclear.s

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+.include "../atari/cclear.s"

libsrc/atari5200/chline.s

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+.include "../atari/chline.s"

libsrc/atari5200/clock.s

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+;
+; from Atari computer version by Christian Groessler, 2014
+;
+; clock_t clock (void);
+; unsigned _clocks_per_sec (void);
+;
+
+        .export         _clock, __clocks_per_sec
+        .importzp       sreg
+
+        .include        "atari5200.inc"
+
+
+.proc   _clock
+
+        ldx     #5              ; Synchronize with Antic, so the interrupt won't change RTCLOK
+        stx     WSYNC           ; while we're reading it. The synchronization is done same as
+@L1:    dex                     ; in SETVBLV function in Atari OS.
+        bne     @L1
+        stx     sreg+1          ; Byte 3 is always zero
+        stx     sreg            ; Byte 2 is always zero, too
+        lda     RTCLOK+1
+        ldx     RTCLOK
+        rts
+
+.endproc
+
+
+.proc   __clocks_per_sec
+
+        ldx     #$00            ; Clear high byte of return value
+        lda     #60
+        rts
+
+.endproc

libsrc/atari5200/cvline.s

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+.include "../atari/cvline.s"

libsrc/atari5200/sysuname.s

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+;
+; Ullrich von Bassewitz, 2003-08-12
+;
+; unsigned char __fastcall__ _sysuname (struct utsname* buf);
+;
+
+        .export         __sysuname, utsdata
+
+        .import         utscopy
+
+        __sysuname = utscopy
+
+;--------------------------------------------------------------------------
+; Data. We define a fixed utsname struct here and just copy it.
+
+.rodata
+
+utsdata:
+        ; sysname
+        .asciiz         "cc65"
+
+        ; nodename
+        .asciiz         ""
+
+        ; release
+        .byte           ((.VERSION >> 8) & $0F) + '0'
+        .byte           '.'
+        .byte           ((.VERSION >> 4) & $0F) + '0'
+        .byte           $00
+
+        ; version
+        .byte           (.VERSION & $0F) + '0'
+        .byte           $00
+
+        ; machine
+        .asciiz         "Atari5200"
+
+
+