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82 lines
1.5 KiB
ArmAsm
82 lines
1.5 KiB
ArmAsm
;
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; Colin Leroy-Mira, 2024
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;
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; char* __fastcall__ asctime (const struct tm* timep)
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;
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.export _asctime
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.import _strftime, pushax
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.importzp ptr1
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.include "time.inc"
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.macpack cpu
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; ------------------------------------------------------------------------
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; Special values
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; We need to be able to store up to 38 bytes:
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; 1234567890123456789012345678901234567
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; "Wednesday September ..1 00:00:00 1970"
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MAX_BUF_LEN = 38
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; ------------------------------------------------------------------------
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; Code
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_asctime:
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; Backup timep
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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pha
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phx
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.else
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sta ptr1
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stx ptr1+1
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.endif
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; Push buf
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lda #<buf
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ldx #>buf
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jsr pushax
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; Push sizeof(buf)
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lda #<MAX_BUF_LEN
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ldx #>MAX_BUF_LEN
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jsr pushax
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; Push format string
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lda #<fmt
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ldx #>fmt
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jsr pushax
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; Restore timep
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.if (.cpu .bitand ::CPU_ISET_65SC02)
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plx
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pla
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.else
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lda ptr1
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ldx ptr1+1
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.endif
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; Call formatter
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jsr _strftime
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; Check return status
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bne :+
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cpx #$00
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bne :+
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rts
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: lda #<buf
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ldx #>buf
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rts
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.data
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fmt: .byte '%'
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.byte 'c'
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.byte $0A
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.byte $00
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.bss
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buf: .res MAX_BUF_LEN
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