A2osX/SYS/KERNEL.S.STRING.txt
2023-05-30 19:13:23 +02:00

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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 destination`
* `>PUSHWI source`
* `>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 destination`
* `>PUSHWI source`
* `>SYSCALL strcpy`
* ## RETURN VALUE
* Y,A = destination
*\--------------------------------------
K.StrCpy clc
phy
pha
jsr SHARED.PullP2P1
bcc .2
.1 jsr SHARED.GetCP1
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
* ## C
* `char * strdup ( char * str);`
* ## ASM
* Y,A = Ptr to source C-String
* CC : success
* Y,A = PTR to String
* X = hMem (C-String)
* CS : error
* A = SYS error code
*\--------------------------------------
STRING.DupBuf256
>LDYAI K.Buf256
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 #$20
sta (ZPPtr1),y
.2 iny
bne .1
inc ZPPtr1+1
bra .1
*--------------------------------------
.9 .AS "a{A["
*/--------------------------------------
* # StrCmp
* Compare 2 strings
* ## C
* `int strcmp(const char *s1, const char *s2);`
* ## ASM
* **In:**
* `>PUSHWI s1`
* `>PUSHWI s2`
* `>SYSCALL strcmp`
* ## RETURN VALUE
* CC : match
* CS : no match
* CC, Y,A=0
* CS, Y,A > 0 or < 0
*\--------------------------------------
K.StrCmp sec
.HS 90 BCC
*/--------------------------------------
* # StrCaseCmp
* Compare 2 strings, ignoring case
* ## C
* `int strcasecmp(const char *s1, const char *s2);`
* ## ASM
* **In:**
* `>PUSHWI s1`
* `>PUSHWI s2`
* `>SYSCALL strcasecmp`
* ## RETURN VALUE
* CC : match
* CS : no match
* CC, Y,A=0
* CS, Y,A > 0 or < 0
*\--------------------------------------
K.StrCaseCmp clc
jsr SHARED.PullP2P1
ldy #0
.1 lda (ZPPtr1),y
beq .7
jsr .80
sta .2+1
lda (ZPPtr2),y
beq .9
jsr .80
.2 eor #$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
*--------------------------------------
.80 bcs .99
cmp #'a'
bcc .99
cmp #'z'+1
bcs .81
eor #$20
.81 clc
.99 rts
*--------------------------------------
MAN
SAVE usr/src/sys/kernel.s.string
LOAD usr/src/sys/kernel.s
ASM