mirror of
https://github.com/cc65/cc65.git
synced 2024-11-16 02:10:52 +00:00
118 lines
2.4 KiB
ArmAsm
118 lines
2.4 KiB
ArmAsm
;
|
|
; Colin Leroy-Mira, 2024
|
|
;
|
|
; char* __fastcall__ fgets (char* s, unsigned size, register FILE* f)
|
|
;
|
|
|
|
.export _fgets
|
|
.import _fgetc, popptr1, pushptr1, popax, pushax, return0, ___errno
|
|
.importzp ptr1, ptr4
|
|
|
|
.include "errno.inc"
|
|
.include "stdio.inc"
|
|
.include "_file.inc"
|
|
|
|
.macpack cpu
|
|
|
|
terminate_ptr:
|
|
lda #$00
|
|
tax
|
|
.if (.cpu .bitand ::CPU_ISET_65SC02)
|
|
sta (ptr4)
|
|
.else
|
|
tay
|
|
sta (ptr4),y
|
|
.endif
|
|
rts
|
|
|
|
_fgets:
|
|
sta ptr1
|
|
stx ptr1+1
|
|
|
|
jsr popax
|
|
sta size
|
|
stx size+1
|
|
|
|
jsr popax
|
|
sta ptr4
|
|
stx ptr4+1
|
|
sta buf
|
|
stx buf+1
|
|
|
|
.if (.cpu .bitand ::CPU_ISET_65SC02)
|
|
stz didread
|
|
.else
|
|
lda #$00 ; We have read nothing yet
|
|
sta didread
|
|
.endif
|
|
|
|
; Check size
|
|
lda size
|
|
ora size+1
|
|
bne read_loop
|
|
lda #EINVAL
|
|
sta ___errno
|
|
jmp return0
|
|
|
|
read_loop:
|
|
lda size ; Dec size
|
|
bne :+
|
|
dec size+1
|
|
: dec size
|
|
|
|
bne :+ ; Check bound
|
|
ldx size+1
|
|
beq done
|
|
|
|
: jsr pushptr1 ; Push ptr1 for backup and load it to AX for fgetc
|
|
jsr _fgetc ; Read a char
|
|
|
|
pha
|
|
jsr popptr1 ; Get ptr1 back
|
|
pla
|
|
|
|
cpx #<EOF
|
|
beq got_eof
|
|
|
|
ldy #$01
|
|
sty didread ; We read at least one char
|
|
|
|
.if (.cpu .bitand ::CPU_ISET_65SC02)
|
|
sta (ptr4)
|
|
.else
|
|
dey
|
|
sta (ptr4),y
|
|
.endif
|
|
|
|
inc ptr4
|
|
bne :+
|
|
inc ptr4+1
|
|
|
|
: cmp #$0A ; Stop at \n
|
|
beq done
|
|
bne read_loop
|
|
|
|
got_eof:
|
|
lda didread
|
|
beq stopped_at_first_char
|
|
ldy #_FILE::f_flags
|
|
lda (ptr1),y
|
|
and #_FERROR
|
|
bne stopped_at_first_char
|
|
|
|
done:
|
|
jsr terminate_ptr
|
|
ldx #>buf
|
|
lda #<buf
|
|
rts
|
|
|
|
stopped_at_first_char:
|
|
jmp terminate_ptr
|
|
|
|
.bss
|
|
|
|
c: .res 1
|
|
buf: .res 2
|
|
size: .res 2
|
|
didread:.res 1
|