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removed redundant code; memset == FillRam, bzero == ClearRam with proper return values

git-svn-id: svn://svn.cc65.org/cc65/trunk@2376 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
izydorst 2003-08-19 22:56:55 +00:00
parent 0ce4187e0e
commit 78908d8421
5 changed files with 34 additions and 50 deletions

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@ -1116,17 +1116,17 @@ compatible with standard CRC routines.
<sect2>FillRam and ClearRam
<p>
<tt/void FillRam (char *dest, char value, unsigned length)/
<tt/void *FillRam (char *dest, char value, unsigned length)/
<p>
<tt/void ClearRam (char *dest, unsigned length)/
<tt/void *ClearRam (char *dest, unsigned length)/
<p>
Both functions are filling given memory range. <tt/ClearRam/ fills with <tt/NULLs/, while
Both functions are filling given memory range. <tt/ClearRam/ fills with <tt/0s/, while
<tt/FillRam/ uses given <tt/value/. Be warned that these functions destroy <tt/r0, r1 and
r2L/ registers. <tt/FillRam/ is an alias for <tt/memset/.
r2L/ registers. These are aliases for <tt/memset/ and <tt/bzero/, respectively.
<sect2>MoveData
<p>
<tt/void MoveData (char *dest, char *src, unsigned length)/
<tt/void *MoveData (char *dest, char *src, unsigned length)/
<p>
This functions copies one memory region to another. There are checks for overlap and the
non-destructive method is chosen. Be warned that this function destroys contents of

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@ -19,10 +19,10 @@ void __fastcall__ CopyFString(char len, char *dest, const char *source);
char __fastcall__ CmpFString(char len, char *dest, const char *source);
unsigned __fastcall__ CRC(const char *buffer, unsigned len);
void __fastcall__ ClearRam(char *dest, unsigned len);
void __fastcall__ FillRam(char *dest, char what, unsigned len);
void* __fastcall__ ClearRam(char *dest, unsigned len);
void* __fastcall__ FillRam(char *dest, char what, unsigned len);
void __fastcall__ MoveData(char *dest, const char *source, unsigned len);
void* __fastcall__ MoveData(char *dest, const char *source, unsigned len);
void __fastcall__ InitRam(char *myInitTab);

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@ -3,43 +3,12 @@
; void* _bzero (void* ptr, size_t n);
; void bzero (void* ptr, size_t n);
;
; Maciej 'YTM/Elysium' Witkowiak, 15.07.2001
; Maciej 'YTM/Elysium' Witkowiak, 20.08.2003
;
; NOTE: bzero will return it's first argument as memset does. It is no problem
; to declare the return value as void, since it may be ignored. _bzero
; (note the leading underscore) is declared with the proper return type,
; because the compiler will replace memset by _bzero if the fill value
; is zero, and the optimizer looks at the return type to see if the value
; in a/x is of any use.
.export _memset, _bzero, __bzero
.import popa, popax
.import _ClearRam, _FillRam
.include "../inc/jumptab.inc"
.include "../inc/geossym.inc"
_bzero:
__bzero:
sta r0L
stx r0H
lda #0
sta r2L ; fill with zeros
beq common
_memset:
sta r0L
stx r0H
jsr popax
sta r2L
common: jsr popax
sta r1L
pha
stx r1H
txa
pha
jsr FillRam
pla ; restore ptr and return it
tax
pla
rts
_bzero = _ClearRam
__bzero = _ClearRam
_memset = _FillRam

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@ -1,10 +1,10 @@
;
; Maciej 'YTM/Alliance' Witkowiak
; Maciej 'YTM/Elysium' Witkowiak
;
; 30.10.99
; 30.10.99, 20.08.2003
; void ClearRam (char *dest, int length);
; void * ClearRam (char *dest, int length);
.import DoublePop
.export _ClearRam
@ -14,4 +14,12 @@
_ClearRam:
jsr DoublePop
jmp ClearRam
pha
txa
pha
jsr ClearRam
pla
tax
pla
rts

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@ -4,7 +4,7 @@
;
; 30.10.99, 15.07.2001
; void FillRam (char *dest, char what, int length);
; void * FillRam (char *dest, char what, int length);
.import popa, popax
.export _FillRam
@ -20,4 +20,11 @@ _FillRam:
jsr popax
sta r1L
stx r1H
jmp FillRam
pha
txa
pha
jsr FillRam
pla
tax
pla
rts