A2osX/SYS/KERNEL.S.STDLIB.txt

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NEW
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AUTO 3,1
*/--------------------------------------
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* # strtof
* Convert String to 40 bits Float
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* ## C
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* `float strtof (const char* str, char** endptr);`
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* ## ASM
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* **In:**
* `>PUSHWI EndPtr`
* `>LDYA str`
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* `>SYSCALL strtof`
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* ## RETURN VALUE
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* On stack (float)
*\--------------------------------------
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K.strtof pha
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>PULLW ZPPtr1
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pla
jsr K.AToF
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lda TXTPTR
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sta (ZPPtr1)
ldy #1
lda TXTPTR+1
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sta (ZPPtr1),y
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rts
*/--------------------------------------
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* # AToF
* Convert String to 40 bits Float
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* ## C
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* `float atof (const char* str);`
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* ## ASM
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* **In:**
* `>LDYA str`
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* `>SYSCALL atof`
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* ## RETURN VALUE
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* On stack (float)
*\--------------------------------------
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K.AToF >STYA TXTPTR Ptr to source string
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lda pStack
sec
sbc #5
sta pStack
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jsr CHARGOT
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ldx #FPU.FIN
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jmp GP.RomCallGetFacOnStack
*/--------------------------------------
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* # StrToL/StrToUL
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* Convert String to 32 bits (unsigned) int
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* ## C
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* `long strtol (const char* str, char** endptr, int base);`
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* `unsigned long strtoul (const char* str, char** endptr, int base);`
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* ## ASM
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* **In:**
* `>PUSHB Base`
* `>PUSHWI EndPtr`
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* `>LDYAI str`
* `>SYSCALL strtol`
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* ## RETURN VALUE
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* On stack (long)
*\--------------------------------------
K.StrToL sec Signed
.HS 90 BCC
K.StrToUL clc Unsigned
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jsr SHARED.SPtr2PPtr1
>PULLA Base
jsr K.AToL.I
bcs K.StrToUL.rts
* clc
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adc ZPPtr2
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sta (ZPPtr1)
lda #0
adc ZPPtr2+1
ldy #1
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sta (ZPPtr1),y
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K.StrToUL.rts rts
*/--------------------------------------
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* # atol
* Convert String to 32 bits long
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* ## C
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* `long atol ( const char * str );`
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* ## ASM
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* **In:**
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* `>LDYA str`
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* `>SYSCALL atol`
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* ## RETURN VALUE
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* On stack (long)
*\--------------------------------------
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K.AToL >STYA ZPPtr2 C-String in Ptr2, Dst buffer in Ptr1
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* lda #10 base 10
sec signed
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K.AToL.I jsr MATH.Dec2ACC32
bcs .9
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ldx #3
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.3 lda ACC32,x
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>PUSHA
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dex
bpl .3
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tya Y = A = Count processed
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* clc
.9
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rts
*/--------------------------------------
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* # atoi
* Convert String to 16 bits int
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* ## C
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* `int atoi ( const char * str );`
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* ## ASM
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* **In:**
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* `>LDYAI str`
* `>SYSCALL atoi`
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* ## RETURN VALUE
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* Y,A = int
*\--------------------------------------
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K.atoi >STYA ZPPtr2
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* lda #10 base 10
sec signed
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jsr MATH.Dec2ACC32
bcs .9
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>LDYA ACC32
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.9
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K.atoi.RTS rts
*/--------------------------------------
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* # RealPath
* Return the canonicalized absolute pathname
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* ## C
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* `unsigned short int realpath (const char* str, char *resolvedpath);`
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* ## ASM
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* **In:**
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* `>PUSHWI resolvedpath`
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* `>LDYA str`
* `>SYSCALL realpath`
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* ## RETURN VALUE
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* CC : success
* Y,A = Ptr to Full Path (C-String)
* X = hMem of Full Path
* CS : A = Error Code
*\--------------------------------------
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K.realpath sec
.HS 90 BCC
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STDLIB.realpath.I
clc
ror .82+1
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ldx #SYS.ExpandStr
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jsr K.SYSCALL2
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bcs K.atoi.RTS
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>STYA ZPPtr1
stx .99+1 save expanded buffer hMem
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ldx #$ff
lda (ZPPtr1)
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cmp #'/' full path starting with '/'?
beq .3 yes, do not append to current prefix
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.1 ldy #S.PS.hCWD
lda (pPs),y
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jsr K.GetMemPtr
>STYA ZPPtr2
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ldy #$ff
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.2 iny
inx
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lda (ZPPtr2),y
sta K.Buf256,x
bne .2
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dex
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.3 ldy #$ff
.4 iny
inx
lda (ZPPtr1),y
sta K.Buf256,x
bne .4
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dex
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beq .81 we have '/'....nothing to do...
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*--------------------------------------
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* X=LEN, K.Buf256 = /dir1/./../file(/)\0
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*--------------------------------------
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ldx #0 will skip leading /
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.5 ldy #0 reset dot counter=0
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.6 inx
lda K.Buf256,x
beq .8
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.7 cmp #'/'
beq .8
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cmp #'.'
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bne .5
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iny
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bra .6
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.8 tya
beq .80 Y was 0....nothing to do...
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dey one dot ?
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bne .9 no..
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dex
dex
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jsr K.RealPath.RemoveAtX we found "/.", remove,useless....
bra .80
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.9 dey "/.." ?
bne .99 "/..." ??!!...syntax error
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dex
dex
dex
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txa we found "/.."
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beq .99 at the beginning of string...cannot remove /dir/..
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jsr K.RealPath.RemoveAtX remove "/.."
.10 dex
lda K.Buf256,x go to "/dir"
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cmp #'/'
bne .10
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jsr K.RealPath.RemoveAtX ...remove "/dir"
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.80 lda K.Buf256,x was / or \0 ?
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bne .5
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*--------------------------------------
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.81 jsr .99
.82 lda #$ff SELF MODIFIED
bpl .88
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>LDYAI K.Buf256
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ldx #SYS.StrDup BANK 2
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jmp K.SYSCALL2
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.88 clc
rts
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.99 lda #$ff SELF MODIFIED
jsr K.FreeMem
lda #E.BADPATH
sec
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rts
*--------------------------------------
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K.RealPath.RemoveAtX
txa X = "/something"
tay
.1 iny
lda K.Buf256,y
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beq .2 found /something\0
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cmp #'/'
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bne .1 found /something/
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.2 phx save X for exit
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.3 iny K.Buf256,y=/ or 0
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inx
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lda K.Buf256-1,y
sta K.Buf256-1,x
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bne .3
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txa
bne .8
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lda #'/' Make sure we have a least '/' in the buffer
sta K.Buf256
stz K.Buf256+1
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.8 plx restore X
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rts
*--------------------------------------
MAN
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SAVE USR/SRC/SYS/KERNEL.S.STDLIB
LOAD USR/SRC/SYS/KERNEL.S
ASM