mirror of https://github.com/cc65/cc65.git
123 lines
2.9 KiB
ArmAsm
123 lines
2.9 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 22.11.2002
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;
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; FILE* __fastcall__ _fopen (const char* name, const char* mode, FILE* f);
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; /* Open the specified file and fill the descriptor values into f */
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;
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.export __fopen
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.import _open
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.import pushax, incsp4, return0
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.importzp sp, ptr1
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.include "errno.inc"
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.include "fcntl.inc"
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.include "_file.inc"
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; ------------------------------------------------------------------------
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; Code
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.proc __fopen
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sta file
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stx file+1 ; Save f
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; Get a pointer to the mode string
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ldy #1
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lda (sp),y
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sta ptr1+1
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dey
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lda (sp),y
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sta ptr1
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; Look at the first character in mode
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ldx #$00 ; Mode will be in X
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lda (ptr1),y ; Get first char from mode
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cmp #'w'
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bne @L1
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ldx #(O_WRONLY | O_CREAT | O_TRUNC)
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bne @L3
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@L1: cmp #'r'
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bne @L2
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ldx #O_RDONLY
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bne @L3
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@L2: cmp #'a'
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bne invmode
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ldx #(O_WRONLY | O_CREAT | O_APPEND)
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; Look at more chars from the mode string
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@L3: iny ; Next char
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beq invmode
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lda (ptr1),y
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beq modeok ; End of mode string reached
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cmp #'+'
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bne @L4
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txa
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ora #O_RDWR ; Always do r/w in addition to anything else
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tax
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bne @L3
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@L4: cmp #'b'
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beq @L3 ; Binary mode is ignored
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; Invalid mode
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invmode:
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lda #EINVAL
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jsr ___seterrno ; Set __errno, returns zero in A
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tax ; a/x = 0
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jmp incsp4
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; Mode string successfully parsed. Store the binary mode onto the stack in
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; the same place where the mode string pointer was before. Then call open()
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modeok: ldy #$00
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txa ; Mode -> A
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sta (sp),y
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tya
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iny
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sta (sp),y
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ldy #4 ; Size of arguments in bytes
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jsr _open ; Will cleanup the stack
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; Check the result of the open() call
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cpx #$FF
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bne openok
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cmp #$FF
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bne openok
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jmp return0 ; Failure, errno/__oserror already set
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; Open call succeeded
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openok: ldy file
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sty ptr1
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ldy file+1
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sty ptr1+1
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ldy #_FILE::f_fd
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sta (ptr1),y ; file->f_fd = fd;
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ldy #_FILE::f_flags
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lda #_FOPEN
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sta (ptr1),y ; file->f_flags = _FOPEN;
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; Return the pointer to the file structure
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lda ptr1
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ldx ptr1+1
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rts
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.endproc
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; ------------------------------------------------------------------------
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; Data
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.bss
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file: .res 2
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