mirror of
https://github.com/A2osX/A2osX.git
synced 2024-06-27 15:29:41 +00:00
221 lines
3.7 KiB
Plaintext
221 lines
3.7 KiB
Plaintext
NEW
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PREFIX
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AUTO 4,1
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*/--------------------------------------
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* # StrLen
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* Returns Length of C-String
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* ## C
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* `int strlen ( char * str);`
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* ## ASM
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* `>LDYAI str`
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* `>SYSCALL strlen`
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* ## RETURN VALUE
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* Y,A = String length
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*\--------------------------------------
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K.StrLen >STYA .1+1
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ldy #0
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tya
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.1 ldx $ffff,y SELF MODIFIED
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beq .8
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iny
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bne .1
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inc
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inc .1+2
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bra .1
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.8 rts
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*/--------------------------------------
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* # StrCat
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* Concatenate strings
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* ## C
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* `char * strcat ( char * destination, const char * source );`
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* ## ASM
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* **In:**
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* `>PUSHWI source`
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* `>LDYAI destination`
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* `>SYSCALL strcat`
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* ## RETURN VALUE
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* Y,A = destination
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*\--------------------------------------
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K.StrCat sec
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.HS 90 BCC
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*/--------------------------------------
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* # StrCpy
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* Copy string
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* ## C
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* `char * strcpy ( char * destination, const char * source );`
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* ## ASM
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* **In:**
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* `>PUSHWI source`
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* `>LDYAI destination`
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* `>SYSCALL strcpy`
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* ## RETURN VALUE
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* Y,A = destination
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*\--------------------------------------
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K.StrCpy clc
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pha
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phy
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jsr MEM.SPtr1PPtr2
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bcc .2
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.1 lda (ZPPtr1)
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beq .2
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inc ZPPtr1
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bne .1
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inc ZPPtr1+1
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bra .1
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.2 ldy #0
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.3 lda (ZPPtr2),y
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sta (ZPPtr1),y
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beq .8
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iny
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bne .3
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inc ZPPtr2+1
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inc ZPPtr1+1
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bra .3
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.8 ply
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pla
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rts
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*/--------------------------------------
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* # StrUpr/StrLwr
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* Convert string to UPPERCASE/lowercase
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* ## C
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* `int strupr ( char * str);`
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* `int strlwr ( char * str);`
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* ## ASM
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* **In:**
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* `>LDYAI str`
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* `>SYSCALL strupr`
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* `>SYSCALL strlwr`
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* ## RETURN VALUE
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* Uppercased/lowercased String in Buffer
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* Y,A = str
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*\--------------------------------------
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K.StrUpr ldx #0
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.HS 2C bit abs
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K.StrLwr ldx #2
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>STYA ZPPtr1
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pha save Y,A to restore them at exit
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phy
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ldy #0
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.1 lda (ZPPtr1),y
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beq .8
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cmp .9,x
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bcc .2
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cmp .9+1,x
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bcs .2
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eor #$20
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sta (ZPPtr1),y
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.2 iny
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bne .1
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inc ZPPtr1+1
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bra .1
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.8 ply
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pla
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rts
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*--------------------------------------
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.9 .AS "azAZ"
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*/--------------------------------------
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* # StrCmp
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* Compare 2 strings
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* ## C
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* `int strcmp(const char *s1, const char *s2);`
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* ## ASM
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* **In:**
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* `>PUSHWI s2`
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* `>LDYAI s1`
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* `>SYSCALL strcmp`
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* ## RETURN VALUE
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* CC : match
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* CS : no match
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* CC, Y,A=0
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* CS, Y,A > 0 or < 0
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*\--------------------------------------
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K.StrCmp sec
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.HS 90 BCC
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*/--------------------------------------
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* # StrCaseCmp
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* Compare 2 strings, ignoring case
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* ## C
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* `int strcasecmp(const char *s1, const char *s2);`
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* ## ASM
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* **In:**
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* `>PUSHWI s2`
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* `>LDYAI s1`
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* `>SYSCALL strcasecmp`
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* ## RETURN VALUE
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* CC : match
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* CS : no match
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* CC, Y,A=0
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* CS, Y,A > 0 or < 0
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*\--------------------------------------
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K.StrCaseCmp clc
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jsr MEM.SPtr1PPtr2
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ldy #0
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.1 lda (ZPPtr1),y
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beq .7
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jsr K.StrCaseCmp.toUpper
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sta .2+1
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lda (ZPPtr2),y
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beq .9
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jsr K.StrCaseCmp.toUpper
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.2 eor #$ff SELF MODIFIED
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bne .9
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iny
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bne .1
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inc ZPPtr1+1
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inc ZPPtr2+1
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bra .1
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.7 lda (ZPPtr2),y
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bne .9
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tay
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.8 clc
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rts
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.9 sec
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lda (ZPPtr1),y
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sbc (ZPPtr2),y
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ldy #0
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sec
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rts
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*--------------------------------------
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K.StrCaseCmp.toUpper
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bcs .9
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cmp #'a'
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bcc .9
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cmp #'z'+1
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bcs .1
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eor #$20
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.1 clc
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.9 rts
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*--------------------------------------
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MAN
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SAVE USR/SRC/SYS/KERNEL.S.STRING
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LOAD USR/SRC/SYS/KERNEL.S
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ASM
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