A2osX/SYS/KERNEL.S.STRING.txt
2020-07-02 23:17:57 +02:00

253 lines
4.4 KiB
Plaintext
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

NEW
AUTO 3,1
*/--------------------------------------
* # StrLen
* Returns Length of C-String
* ## C
* `int strlen ( char * str);`
* ## ASM
* `>LDYAI str`
* `>SYSCALL strlen`
* ## RETURN VALUE
* Y,A = String length
*\--------------------------------------
K.StrLen >STYA .1+1
ldy #0
tya
.1 ldx $ffff,y SELF MODIFIED
beq .8
iny
bne .1
inc
inc .1+2
bra .1
.8 clc
rts
*/--------------------------------------
* # StrCat
* Concatenate strings
* ## C
* `char * strcat ( char * destination, const char * source );`
* ## ASM
* **In:**
* `>PUSHWI source`
* `>LDYAI destination`
* `>SYSCALL strcat`
* ## RETURN VALUE
* Y,A = destination
*\--------------------------------------
K.StrCat sec
.HS 90 BCC
*/--------------------------------------
* # StrCpy
* Copy string
* ## C
* `char * strcpy ( char * destination, const char * source );`
* ## ASM
* **In:**
* `>PUSHWI source`
* `>LDYAI destination`
* `>SYSCALL strcpy`
* ## RETURN VALUE
* Y,A = destination
*\--------------------------------------
K.StrCpy clc
phy
pha
jsr SHARED.SPtr1PPtr2
bcc .2
.1 jsr SHARED.GetCharPtr1
bne .1
.2 ldy #0
.3 lda (ZPPtr2),y
sta (ZPPtr1),y
beq K.StrDup.8
iny
bne .3
inc ZPPtr2+1
inc ZPPtr1+1
bra .3
*/--------------------------------------
* # StrDup
* Create a new copy of this C-String
* Y,A = Ptr to source C-String
* ## RETURN VALUE
* CC : success
* Y,A = PTR to String
* X = hMem (C-String)
* CS : error
* A = SYS error code
*\--------------------------------------
K.StrDup >STYA .1+1
>STYA .4+1
lda #0
tay
.1 ldx $ffff,y
beq .2
iny
bne .1
inc
inc .1+2
bne .1
.2 iny Add one for ending 0
bne .3
inc
.3 jsr K.GetMem
bcs K.StrDup.RTS
>STYA .5+1
phy
pha
ldy #0
.4 lda $ffff,y
.5 sta $ffff,y
beq K.StrDup.8
iny
bne .4
inc .4+2
inc .5+2
bne .4
K.StrDup.8 pla
ply
clc
K.StrDup.RTS rts
*/--------------------------------------
* # StrUpr/StrLwr
* Convert string to UPPERCASE/lowercase
* ## C
* `int strupr ( char * str);`
* `int strlwr ( char * str);`
* ## ASM
* **In:**
* `>LDYAI str`
* `>SYSCALL strupr`
* `>SYSCALL strlwr`
* ## RETURN VALUE
* Uppercased/lowercased String in Buffer
* Y,A = str
*\--------------------------------------
K.StrUpr ldx #0
.HS 2C bit abs
K.StrLwr ldx #2
>STYA ZPPtr1
phy
pha save Y,A to restore them at exit
ldy #0
.1 lda (ZPPtr1),y
beq K.StrDup.8
cmp .9,x
bcc .2
cmp .9+1,x
bcs .2
eor #$20
sta (ZPPtr1),y
.2 iny
bne .1
inc ZPPtr1+1
bra .1
*--------------------------------------
.9 .AS "azAZ"
*/--------------------------------------
* # StrCmp
* Compare 2 strings
* ## C
* `int strcmp(const char *s1, const char *s2);`
* ## ASM
* **In:**
* `>PUSHWI s2`
* `>LDYAI s1`
* `>SYSCALL strcmp`
* ## RETURN VALUE
* CC : match
* CS : no match
* CC, Y,A=0
* CS, Y,A > 0 or < 0
*\--------------------------------------
K.StrCmp sec
.HS 90 BCC
*/--------------------------------------
* # StrCaseCmp
* Compare 2 strings, ignoring case
* ## C
* `int strcasecmp(const char *s1, const char *s2);`
* ## ASM
* **In:**
* `>PUSHWI s2`
* `>LDYAI s1`
* `>SYSCALL strcasecmp`
* ## RETURN VALUE
* CC : match
* CS : no match
* CC, Y,A=0
* CS, Y,A > 0 or < 0
*\--------------------------------------
K.StrCaseCmp clc
jsr SHARED.SPtr1PPtr2
ldy #0
.1 lda (ZPPtr1),y
beq .7
jsr K.StrCaseCmp.toUpper
sta .2+1
lda (ZPPtr2),y
beq .9
jsr K.StrCaseCmp.toUpper
.2 eor #$ff SELF MODIFIED
bne .9
iny
bne .1
inc ZPPtr1+1
inc ZPPtr2+1
bra .1
.7 lda (ZPPtr2),y
bne .9
tay
.8 clc
rts
.9 sec
lda (ZPPtr1),y
sbc (ZPPtr2),y
ldy #0
sec
rts
*--------------------------------------
K.StrCaseCmp.toUpper
bcs .9
cmp #'a'
bcc .9
cmp #'z'+1
bcs .1
eor #$20
.1 clc
.9 rts
*--------------------------------------
SHARED.SPtr1PPtr2
>STYA ZPPtr1
>PULLW ZPPtr2
rts
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.STRING
LOAD USR/SRC/SYS/KERNEL.S
ASM