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gno/bin/gsh/shellutil.asm

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**************************************************************************
*
* The GNO Shell Project
*
* Developed by:
* Jawaid Bazyar
* Tim Meekins
*
**************************************************************************
*
* SHELLUTIL.ASM
* By Tim Meekins
*
* Utility functions used by the shell. Mainly string functions.
*
**************************************************************************
keep o/shellutil
mcopy m/shellutil.mac
;=========================================================================
;
; Convert the accumulator to lower case.
;
;=========================================================================
tolower START
cmp #'A'
bcc done
cmp #'Z'+1
bcs done
adc #'a'-'A'
done rts
END
;=========================================================================
;
; Convert ':' to '/'
;
;=========================================================================
toslash START
cmp #':'
bne done
lda #'/'
done rts
END
;=========================================================================
;
; Convert a c string to lower case
;
;=========================================================================
lowercstr START
space equ 1
p equ space+2
end equ p+4
tsc
phd
tcd
short a
ldy #-1
loop iny
lda [p],y
beq done
cmp #'A'
bcc loop
cmp #'Z'+1
bcs loop
adc #'a'-'A'
sta [p],y
bra loop
done rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
rts
END
;=========================================================================
;
; Get the length of a c string.
;
;=========================================================================
cstrlen START
space equ 1
p equ space+2
end equ p+4
tsc
phd
tcd
short a
ldy #0
loop lda [p],y
beq done
iny
bra loop
done rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
tya
rts
END
;=========================================================================
;
; Copy one string to another. Assumes an alloccstr has been performed on
; destination.
;
;=========================================================================
copycstr START
space equ 1
q equ space+2
p equ q+4
end equ p+4
tsc
phd
tcd
short a
ldy #0
loop lda [p],y
beq done
sta [q],y
iny
bra loop
done sta [q],y
rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
rts
END
;=========================================================================
;
; Converts a pascal string to a c string. This allocates memory for the
; new c string.
;
;=========================================================================
p2cstr START
cstr equ 1
space equ cstr+4
p equ space+2
end equ p+4
tsc
sec
sbc #space-1
tcs
phd
tcd
lda [p]
and #$FF
inc a
pea 0
pha
jsl ~NEW
sta cstr
stx cstr+2
lda [p]
inc p
and #$FF
tax
short a
ldy #0
cpx #0
beq done
loop lda [p],y
sta [cstr],y
iny
dex
bne loop
done lda #0
sta [cstr],y
ldx cstr+2
ldy cstr
rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
tya
rts
END
;=========================================================================
;
; Converts a c string to a pascal string. Does not allocate memory.
;
;=========================================================================
c2pstr START
space equ 1
p equ space+2
cstr equ p+4
end equ cstr+4
tsc
phd
tcd
short a
ldy #0
loop lda [cstr],y
beq endstr
iny
sta [p],y
bra loop
endstr tya
sta [p]
rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
rts
END
;=========================================================================
;
; Converts a c string to a pascal string. Allocates memory for p string.
;
;=========================================================================
c2pstr2 START
p equ 1
space equ p+4
cstr equ space+2
end equ cstr+4
tsc
sec
sbc #space-1
tcs
phd
tcd
pei (cstr+2)
pei (cstr)
jsr cstrlen
inc a
pea 0
pha
jsl ~NEW
sta p
stx p+2
short a
ldy #0
loop lda [cstr],y
beq endstr
iny
sta [p],y
bra loop
endstr tya
sta [p]
ldx p+2
ldy p
rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
tya
rts
END
;=========================================================================
;
; Compare two c strings. Return 0 if equal, -1 if less than, +1 greater
;
;=========================================================================
cmpcstr START
space equ 1
q equ space+2
p equ q+4
end equ p+4
tsc
phd
tcd
short a
ldx #0
ldy #0
strloop lda [p],y
beq strchk
cmp [q],y
bne notequal
iny
bra strloop
strchk lda [q],y
beq done
lessthan dex
bra done
notequal bcc lessthan
inx
done rep #$21
longa on
lda space
sta end-2
pld
tsc
adc #end-3
tcs
txa
rts
END
;=========================================================================
;
; Convert a c string to a GS/OS string (don't forget to dispose when done)
;
;=========================================================================
c2gsstr START
len equ 1
gstr equ len+2
space equ gstr+4
cstr equ space+2
end equ cstr+4
tsc
sec
sbc #space-1
tcs
phd
tcd
pei (cstr+2)
pei (cstr)
jsr cstrlen
sta len
adc #3
pea 0
pha
jsl ~NEW
sta gstr
stx gstr+2
inc a
inc a
pei (cstr+2)
pei (cstr)
phx
pha
jsr copycstr
lda len
sta [gstr]
ldx gstr+2
ldy gstr
lda space
sta end-2
pld
tsc
adc #end-3
tcs
tya
rts
END
;=========================================================================
;
; Takes two strings, concats into a newly created string.
;
;=========================================================================
catcstr START
new equ 1
space equ new+4
q equ space+2
p equ q+4
end equ p+4
tsc
sec
sbc #space-1
tcs
phd
tcd
pei (p+2)
pei (p)
jsr cstrlen
pha
pei (q+2)
pei (q)
jsr cstrlen
adc 1,s
inc a
inc a
plx
pea 0
pha
jsl ~NEW
sta new
stx new+2
ldy #0
copy1 lda [p],y
and #$FF
beq copy2
sta [new],y
iny
bra copy1
copy2 lda [q]
and #$FF
sta [new],y
beq done
iny
inc q
bra copy2
done ldx new+2
ldy new
lda space
sta end-2
pld
tsc
clc
adc #end-3
tcs
tya
rts
END
;=====================================================================
;
; call ~DISPOSE if pointer is not NULL
;
;=====================================================================
nullfree START
lda 4,s
ora 6,s
bne ok
lda 2,s
sta 6,s
lda 1,s
sta 5,s
plx
plx
rtl
ok jml ~DISPOSE
END
;=====================================================================
;
; Print a carriage return and a newline, unless "newline" shell var
; is set.
;
;=====================================================================
newlineX START
using vardata
lda varnewline
beq newline
rts
;=====================================================================
;
; Print a carriage return and a newline
;
;=====================================================================
newline ENTRY
lda #13
jmp putchar
END
**************************************************************************
*
* Quick little routine for reading variables and converting to
* null terminated strings. We could probably just link the Orca/C
* library getenv(), but lets stay Orca-free, after all, that's why this
* is written in assembly! :)
*
* Borrowed from termcap
*
**************************************************************************
getenv START
newval equ 1
len equ newval+4
namebuf equ len+2
retval equ namebuf+4
space equ retval+4
var equ space+3
end equ var+4
; subroutine (4:var),space
tsc
sec
sbc #space-1
tcs
phd
tcd
stz retval
stz retval+2
lock mutex
;
; get length of variable name
;
short a
ldy #0
findlen lda [var],y
beq gotlen
iny
bra findlen
gotlen long a
sty len
;
; allocate a buffer to put the pascal string
;
iny
pea 0
phy
jsl ~NEW
sta namebuf
stx namebuf+2
sta varparm
stx varparm+2
ora namebuf+2
jeq exit
;
; now make a pascal string from the c string
;
short ai
lda len
sta [namebuf]
ldy #0
copyname lda [var],y
beq copydone
iny
sta [namebuf],y
bra copyname
copydone long ai
;
; allocate a return buffer
;
jsl alloc256
sta newval
stx newval+2
sta varparm+4
stx varparm+6
ora newval+2
jeq exit0
;
; Let's go read the variable
;
Read_Variable varparm
;
; Was it defined?
;
lda [newval]
and #$FF
jeq exit1 ;return a null if not defined
;
; Make a return buffer to return the variable value
;
inc a
pea 0
pha
jsl ~NEW
sta retval
stx retval+2
ora retval+2
jeq exit1
;
; And copy the resulting value
;
short ai
lda [newval]
tay
copyval cpy #0
beq val1
lda [newval],y
dey
sta [retval],y
bra copyval
val1 lda [newval]
tay
lda #0
sta [retval],y
long ai
;
; hasta la vista, baby
;
exit1 ldx newval+2
lda newval
jsl free256
exit0 pei (namebuf+2)
pei (namebuf)
jsl nullfree
exit unlock mutex
ldy retval
ldx retval+2
lda space+1
sta end-2
lda space
sta end-3
pld
tsc
clc
adc #end-4
tcs
tya
rtl
varparm ds 8
mutex key
END
rmemcpy START
subroutine (2:num,4:src,4:dest),0
ldy num
beq done
tya
dey
bit #1
bne odd
dey
bra lp1
odd short m
lda [src],y
sta [dest],y
long m
dey
dey
bmi done
lp1 lda [src],y
sta [dest],y
dey
dey
bpl lp1
done return
END
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