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Rewrote fprintf in assembler

git-svn-id: svn://svn.cc65.org/cc65/trunk@513 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2000-12-01 17:25:07 +00:00
parent aa10775c66
commit 13be3ba3ef
4 changed files with 72 additions and 28 deletions

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@ -12,7 +12,6 @@ fgetc.s
fgetpos.s
fgets.s
fopen.s
fprintf.s
fputc.s
fputs.s
fread.s

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@ -11,7 +11,7 @@
%.o: %.s
@$(AS) -g -o $@ $(AFLAGS) $<
C_OBJS = fclose.o fgets.o fprintf.o calloc.o _fopen.o\
C_OBJS = fclose.o fgets.o calloc.o _fopen.o\
fputs.o fread.o fwrite.o gets.o realloc.o bsearch.o strxfrm.o\
_hextab.o fdopen.o strtok.o\
_afailed.o fopen.o fgetc.o fputc.o puts.o gets.o perror.o getchar.o\
@ -35,6 +35,7 @@ S_OBJS = _fdesc.o \
cprintf.o \
errno.o \
fmisc.o \
fprintf.o \
free.o \
getcpu.o \
isalnum.o \

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@ -1,26 +0,0 @@
/*
* fprintf.c
*
* Ullrich von Bassewitz, 11.08.1998
*/
#include <stdarg.h>
#include <stdio.h>
int fprintf (FILE* /*F*/, const char* format, ...)
{
va_list ap;
va_start (ap, format);
/* Do formatting and output. Since we know, that va_end is empty, we don't
* call it here, saving an extra variable and some code.
*/
return vfprintf ((FILE*) va_fix (ap, 1), (char*) va_fix (ap, 2), ap);
}

70
libsrc/common/fprintf.s Normal file
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@ -0,0 +1,70 @@
;
; int printf (const char* Format, ...);
;
; Ullrich von Bassewitz, 1.12.2000
;
.export _fprintf
.import pushax, addysp, subysp, _vfprintf
.importzp sp, ptr1
.macpack generic
; ----------------------------------------------------------------------------
; Data
.bss
ParamSize: .res 1 ; Number of parameter bytes
; ----------------------------------------------------------------------------
; Code
.code
_fprintf:
sty ParamSize ; Number of param bytes passed in Y
; We have to push f and format, both in the order they already have on stack.
; To make this somewhat more efficient, we will create space on the stack and
; the do a copy of the complete block instead of pushing each parameter
; separately. Since the size of the arguments passed is the same as the size
; of the fixed arguments, this will allow us to calculate the pointer to the
; fixed size arguments easier (they're just ParamSize bytes away).
ldy #4
jsr subysp
; Calculate a pointer to the Format argument
lda ParamSize
add sp
sta ptr1
ldx sp+1
bcc @L1
inx
@L1: stx ptr1+1
; Now copy both, f and format
ldy #4-1
@L2: lda (ptr1),y
sta (sp),y
dey
bpl @L2
; Load va_list (last and __fastcall__ parameter to vfprintf)
lda ptr1
ldx ptr1+1
; Call vfprintf
jsr _vfprintf
; Cleanup the stack. We will return what we got from vfprintf
ldy ParamSize
jmp addysp