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https://github.com/cc65/cc65.git
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806ffe5675
Tested on real KIM-1 hardware. read.s: - Remove commented out line. - Remove unused check for bell character. - Remove echo of newline (hardware always echoes entered characters). - This fixes gets() and fgets() so they return when CR is entered. write.s: - Fix check for adding return after linefeed (failed to work because OUTCHR changes A) - Remove unused check for bell character. kim1.inc: - Add symbol for monitor entry crt0.s: - Jump to KIM-1 monitor by address rather than using BRK (which relies on vector being set in RAM)
47 lines
1.2 KiB
ArmAsm
47 lines
1.2 KiB
ArmAsm
;
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; int __fastcall__ read (int fd, void* buf, unsigned count);
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;
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.include "kim1.inc"
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.import popax, popptr1
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.importzp ptr1, ptr2, ptr3
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.export _read
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.proc _read
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sta ptr3
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stx ptr3+1 ; Count in ptr3
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inx
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stx ptr2+1 ; Increment and store in ptr2
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tax
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inx
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stx ptr2
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jsr popptr1 ; Buffer address in ptr1
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jsr popax
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begin: dec ptr2
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bne getch
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dec ptr2+1
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beq done ; If buffer full, return
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getch: jsr INTCHR ; Get character using Monitor ROM call
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and #$7F ; Clear top bit
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cmp #$0D ; Check for '\r'
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bne putch ; ...if CR character
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lda #$0A ; Replace with '\n'
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putch: ldy #$00 ; Put char into return buffer
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sta (ptr1),y
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inc ptr1 ; Increment pointer
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bne begin
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inc ptr1+1
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bne begin
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done: lda ptr3
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ldx ptr3+1
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rts ; Return count
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.endproc
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