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Rewrote fwrite in assembler
git-svn-id: svn://svn.cc65.org/cc65/trunk@1614 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -18,7 +18,6 @@ freopen.s
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fseek.s
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fsetpos.s
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ftell.s
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fwrite.s
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getchar.s
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gets.s
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gmtime.s
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@ -30,7 +30,6 @@ C_OBJS = _afailed.o \
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fseek.o \
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fsetpos.o \
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ftell.o \
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fwrite.o \
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getchar.o \
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gets.o \
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gmtime.o \
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@ -74,6 +73,7 @@ S_OBJS = _fdesc.o \
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fopen.o \
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fprintf.o \
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free.o \
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fwrite.o \
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getcpu.o \
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isalnum.o \
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isalpha.o \
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@ -1,51 +0,0 @@
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/*
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* fwrite.c
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*
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* Ullrich von Bassewitz, 04.06.1998
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "_file.h"
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size_t fwrite (const void* buf, size_t size, size_t count, FILE* f)
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{
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int bytes;
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/* Is the file open? */
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if ((f->f_flags & _FOPEN) == 0) {
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_errno = EINVAL; /* File not open */
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return 0;
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}
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/* Did we have an error */
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if ((f->f_flags & _FERROR) != 0) {
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/* Cannot write to stream */
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return 0;
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}
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/* How many bytes to write? */
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bytes = size * count;
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if (bytes) {
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/* Write the data. */
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if (write (f->f_fd, buf, bytes) == -1) {
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/* Write error */
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f->f_flags |= _FERROR;
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return 0;
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}
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}
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/* Don't waste time with expensive calculations, assume the write was
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* complete and return the count of items.
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*/
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return count;
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}
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129
libsrc/common/fwrite.s
Normal file
129
libsrc/common/fwrite.s
Normal file
@ -0,0 +1,129 @@
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;
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; Ullrich von Bassewitz, 22.11.2002
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;
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; size_t __fastcall__ fwrite (const void* buf, size_t size, size_t count, FILE* f);
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; /* Write to a file */
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;
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.export _fwrite
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.import _write
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.import pushax, incsp6, addysp, ldaxysp, pushwysp, return0
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.import tosumulax, tosudivax
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.importzp ptr1
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.include "errno.inc"
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.include "_file.inc"
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; ------------------------------------------------------------------------
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; Code
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.proc _fwrite
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; Save f and place it into ptr1
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sta f
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sta ptr1
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stx f+1
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stx ptr1+1
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; Check if the file is open
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ldy #_FILE_f_flags
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lda (ptr1),y
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and #_FOPEN ; Is the file open?
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bne @L2 ; Branch if yes
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; File not open
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lda #EINVAL
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sta __errno
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lda #0
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sta __errno+1
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@L1: jsr incsp6
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jmp return0
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; Check if the stream is in an error state
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@L2: lda (ptr1),y ; get f->f_flags again
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and #_FERROR
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bne @L1
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; Build the stackframe for write()
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ldy #_FILE_f_fd
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lda (ptr1),y
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ldx #$00
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jsr pushax ; f->f_fd
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ldy #9
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jsr pushwysp ; buf
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; Stack is now: buf/size/count/f->fd/buf
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; Calculate the number of bytes to write: count * size
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ldy #7
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jsr pushwysp ; count
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ldy #9
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jsr ldaxysp ; Get size
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jsr tosumulax ; count * size -> a/x
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; Check if the number of bytes is zero. Don't call write in this case
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cpx #0
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bne @L3
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cmp #0
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bne @L3
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; The number of bytes to write is zero, just return count
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ldy #5
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jsr ldaxysp ; Get count
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ldy #10
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jmp addysp ; Drop params, return
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; Call write(). This will leave the original 3 params on the stack
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@L3: jsr pushax
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jsr _write
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; Check for errors in write
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cpx #$FF
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bne @L4
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cmp #$FF
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bne @L4
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; Error in write. Set the stream error flag and bail out. _oserror and/or
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; errno are already set by write().
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lda f
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sta ptr1
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lda f+1
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sta ptr1+1
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ldy #_FILE_f_fd
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lda (ptr1),y
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ora #_FERROR
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sta (ptr1),y
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bne @L1 ; Return zero
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; Write was ok. Return the number of items successfully written. Since we've
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; checked for bytes == 0 above, size cannot be zero here, so the division is
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; safe.
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@L4: jsr pushax ; Push number of bytes written
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ldy #5
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jsr ldaxysp ; Get size
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jsr tosudivax ; bytes / size -> a/x
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jmp incsp6 ; Drop params, return
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.endproc
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; ------------------------------------------------------------------------
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; Data
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.bss
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f: .res 2
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@ -61,8 +61,7 @@ out:
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lda (ptr1),y
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tax
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dey
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lda (ptr1),y
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jsr pushax ; Push D->ptr
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lda (ptr1),y ; Load D->ptr
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jsr _fwrite
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sta ptr2 ; Save function result
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stx ptr2+1
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