A2osX/SYS/KERNEL.S.STRING.txt
2018-10-12 17:47:57 +02:00

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NEW
PREFIX /A2OSX.BUILD
AUTO 4,1
*/--------------------------------------
* # 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 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
jsr MEM.SPtr1PPtr2
bcc .2
.1 lda (ZPPtr1)
beq .2
inc ZPPtr1
bne .1
inc ZPPtr1+1
bra .1
.2 ldy #0
.3 lda (ZPPtr2),y
sta (ZPPtr1),y
beq .8
iny
bne .3
inc ZPPtr2+1
inc ZPPtr1+1
bra .3
.8 rts
*/--------------------------------------
* # StrMatch
* Compare a String against pattern (e.g. '*test?.txt')
* ## C
* `int * strmatch ( char * s, const char * pattern );`
* ## ASM
* **In:**
* `>PUSHWI pattern`
* `>LDYAI s`
* `>SYSCALL strmatch`
* ## RETURN VALUE
* CC : match
* CS : no match
*\--------------------------------------
K.StrMatch jsr MEM.SPtr1PPtr2
lda (ZPPtr2) Get pattern 1st byte
beq .8 Match always if empty
ldy #0
bra .21
.1 inc ZPPtr2 Make PTR2 (pattern) advance to next char
bne .2
inc ZPPtr2+1
.2 lda (ZPPtr2) get pattern char
beq .41 end of pattern...
.21 cmp #'*'
beq .5
.3 lda (ZPPtr1) we must match ? or regular char, check if at end of string
beq .9 no char left, exit with error
lda (ZPPtr2) get back pattern char
cmp #'?'
beq .4 no need to compare, any char will match
cmp (ZPPtr1),y Regular Char, compare with string at Y
bne .9 no match, exit
.4 iny advance to next char to compare
bra .1 continue if remaining char in pattern
.41 lda (ZPPtr1),y end of pattern, but end of string ?
beq .8 yes, string matched entirely
* no, remaining char in string, no match
.9 sec
rts
.5 inc ZPPtr2 Make PTR2 advance to next char
bne .6
inc ZPPtr2+1
.6 lda (ZPPtr2) we have '*', last char of pattern ?
beq .8 yes, match everything, including empty string
lda (ZPPtr2) get next char of pattern
cmp #'*' another '*' ?
beq .5 yes, '**' = '*', go next char
cmp #'?' '*?' ? we must match a least one char
beq .3
.7 lda (ZPPtr1),y we need at least one remaining char in string, check if at end of string
beq .9 no chance to match ? or regular char
iny
lda (ZPPtr2) get again char in pattern
cmp (ZPPtr1),y compare with char in string
bne .7 not equal to next non wildcard in pattern
iny
bra .1 go check remaining char in pattern...
.8 clc
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
pha save Y,A to restore them at exit
phy
ldy #0
.1 lda (ZPPtr1),y
beq .8
cmp .9,x
bcc .2
cmp .9+1,x
bcs .2
eor #$20
sta (ZPPtr1),y
.2 iny
bne .1
inc ZPPtr1+1
bra .1
.8 ply
pla
rts
*--------------------------------------
.9 .AS "azAZ"
*/--------------------------------------
* # StrCmp
* Compare 2 strings
* ## C
* `int strcmp(const char *s1, const char *s2);`
* ## ASM
* **In:**
* `>PUSHWI s2`
* `>LDYAI s1`
* `>SYSCALL strcmp`
* ## RETURN VALUE
* CC : match
* CS : no match
* CC, Y,A=0
* CS, Y,A > 0 or < 0
*\--------------------------------------
K.StrCmp sec
.HS 90 BCC
*/--------------------------------------
* # StrCaseCmp
* Compare 2 strings, ignoring case
* ## C
* `int strcasecmp(const char *s1, const char *s2);`
* ## ASM
* **In:**
* `>PUSHWI s2`
* `>LDYAI s1`
* `>SYSCALL strcasecmp`
* ## RETURN VALUE
* CC : match
* CS : no match
* CC, Y,A=0
* CS, Y,A > 0 or < 0
*\--------------------------------------
K.StrCaseCmp clc
jsr MEM.SPtr1PPtr2
ldy #0
.1 lda (ZPPtr1),y
beq .7
jsr K.StrCaseCmp.toUpper
sta .2+1
lda (ZPPtr2),y
beq .9
jsr K.StrCaseCmp.toUpper
.2 eor #$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
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.STRING
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM