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cc65/libsrc/common/fmisc.s

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;
; Ullrich von Bassewitz, 31.05.1998
;
; Several small file stream functions
;
.export _clearerr, _feof, _ferror, _fileno, _fflush
.import return0
.import __errno
.importzp ptr1
;
; Get the FILE* parameter, check if the file is open
;
getf: sta ptr1
stx ptr1+1
ldy #1
lda (ptr1),y ; get f->f_flags
and #$01 ; file open?
beq @L1 ; jump if no
clc ; ok
rts
@L1: sec
rts
;
; void clearerr (FILE* f);
;
_clearerr:
jsr getf
bcs err
lda (ptr1),y
and #$F9
sta (ptr1),y
err: rts
;
; int feof (FILE* f);
;
_feof:
jsr getf
; bcs err
lda (ptr1),y
and #$02
ldx #0
rts
;
; int ferror (FILE* f);
;
_ferror:
jsr getf
; bcs err
lda (ptr1),y
and #$04
ldx #0
rts
;
; int fileno (FILE* f);
;
_fileno:
jsr getf
; bcs err
dey
lda (ptr1),y
ldx #0
rts
;
; int __fastcall__ fflush (FILE* f);
;
_fflush = return0