gno/bin/gsh/cmd.asm

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***********************************************************************
*
* The GNO Shell Project
*
* Developed by:
* Jawaid Bazyar
* Tim Meekins
*
**************************************************************************
*
* CMD.ASM
* By Tim Meekins
*
* Command line parsing routines.
*
**************************************************************************
mcopy m/cmd.mac
keep o/cmd.mac
SIGINT gequ 2
SIGSTOP gequ 17
;
; TOKENS used by the parser
;
T_WORD gequ 1
T_BAR gequ 2
T_AMP gequ 3
T_SEMI gequ 4
T_GT gequ 5
T_GTGT gequ 6
T_GTAMP gequ 7
T_GTGTAMP gequ 8
T_LT gequ 9
T_NL gequ 10
T_EOF gequ 11
T_ERROR gequ 12
T_NULL gequ 13
MAXARG gequ 256
BADFD gequ -2
**************************************************************************
*
* Read a token from the buffer.
*
* Input: word points to a buffer to place a word is parsed.
*
* Ouput: the token is placed in the accumulator
*
**************************************************************************
gettoken START
buf equ 1
state equ buf+4
ch equ state+2
space equ ch+2
stream equ space+3
word equ stream+4
end equ word+4
; subroutine (4:word,4:stream),space
tsc
sec
sbc #space-1
tcs
phd
tcd
;
; What state are we in
;
NEUTRAL equ 0 ;a neutral state, get anything
GTGT equ 1 ;looking for a second '>'
INQUOTE equ 2 ;parsing a quoted string
INWORD equ 3 ;parsing a word
SINGQUOTE equ 4 ;single quote string
;
; start in the neutral state
;
ld2 NEUTRAL,state
lda [stream]
sta buf
ldy #2
lda [stream],y
sta buf+2
;
; the main loop
;
loop lda [buf]
inc buf
and2 @a,#$FF,ch
bne switch
if2 state,ne,#INWORD,loop2
jmp endword
loop2 if2 @a,ne,#GTGT,loop3
dec buf
lda #T_GT
jmp done
loop3 if2 @a,eq,#INQUOTE,error1
if2 @a,eq,#SINGQUOTE,error2
lda #T_EOF
jmp done
error1 ldx #^errstr1
lda #errstr1
bra error0
error2 ldx #^errstr2
lda #errstr2
error0 jsr errputs
lda #T_ERROR
jmp done
;
; jump to the current state
;
switch lda state
asl a
tax
jmp (statetbl,x)
statetbl dc a2'case_neutral'
dc a2'case_gtgt'
dc a2'case_inquote'
dc a2'case_inword'
dc a2'case_single'
;
; CASE NEUTRAL
;
case_neutral if2 ch,ne,#';',neut1
lda #T_SEMI
jmp done
neut1 if2 @a,ne,#'&',neut2
lda #T_AMP
jmp done
neut2 if2 @a,ne,#'|',neut3
lda #T_BAR
jmp done
neut3 if2 @a,ne,#'<',neut4
lda #T_LT
jmp done
neut5 cmp #' ' ;space
jeq loop
cmp #9 ;tab
jeq loop
if2 @a,ne,#'>',neut6
lda #GTGT
bra neut10
neut4 if2 @a,ne,#13,neut4a ;return
lda #T_NL
jmp done
neut4a if2 @a,ne,#0,neut4b ;EOF
lda #T_EOF
jmp done
neut4b if2 @a,ne,#'#',neut5 ;comment
neut4c lda [buf]
and #$7F
beq neut4d
inc buf
if2 @a,eq,#13,neut4d
if2 @a,eq,#10,neut4d
bra neut4c
neut4d jmp loop
neut6 if2 @a,ne,#'"',neut7
startquote lda #INQUOTE
bra neut10
neut7 if2 @a,ne,#"'",neut8
startsingle lda #SINGQUOTE
bra neut10
neut8 if2 @a,ne,#'\',neut9
lda [buf]
and #$FF
inc buf
if2 @a,eq,#13,neut10a
neut9 sta [word] ;default
inc word
lda #INWORD
neut10 sta state
neut10a jmp loop
;
; CASE GTGT
;
case_gtgt if2 ch,eq,#'>',gtgt2
if2 @a,eq,#'&',gtgt1
dec buf
lda #T_GT
jmp done
gtgt1 lda #T_GTAMP
jmp done
gtgt2 lda [buf]
and #$FF
if2 @a,eq,#'&',gtgt3
lda #T_GTGT
jmp done
gtgt3 inc buf
lda #T_GTGTAMP
jmp done
;
; CASE INQUOTE
;
case_inquote if2 ch,ne,#'\',quote2 ;is it a quoted character?
lda [buf]
inc buf
putword sta [word]
inc word
jmp loop
quote2 if2 @a,ne,#'"',putword
ld2 INWORD,state
jmp loop
;
; CASE SINGLEQUOTE
;
case_single anop
if2 ch,ne,#"'",putword
ld2 INWORD,state
jmp loop
;
; CASE INWORD
;
case_inword if2 ch,eq,#000,endword
if2 @a,eq,#';',endword
if2 @a,eq,#'&',endword
if2 @a,eq,#'|',endword
if2 @a,eq,#'>',endword
if2 @a,eq,#'<',endword
if2 @a,eq,#' ',endword
if2 @a,eq,#009,endword
if2 @a,eq,#013,endword
cmp #'"'
jeq startquote
cmp #"'"
jeq startsingle
if2 @a,ne,#'\',putword
lda [buf]
inc buf
and #$FF
if2 @a,eq,#13,word2
bra putword
word2 jmp loop
endword dec buf
finiword lda #0
sta [word]
lda #T_WORD
done tax
lda buf
sta [stream]
lda buf+2
ldy #2
sta [stream],y
lda space
sta end-3
lda space+1
sta end-2
pld
tsc
clc
adc #end-4
tcs
txa
rtl
errstr1 dc c'gsh: Missing ending ".',h'0d00'
errstr2 dc c"gsh: Missing ending '.",h'0d00'
END
**************************************************************************
*
* Parse a single command
*
**************************************************************************
command START
pipefds equ 1
errappend equ pipefds+2
errfile equ errappend+2
srcfile equ errfile+4
dstfile equ srcfile+4
count equ dstfile+4
argv equ count+2
word equ argv+4
cmdline equ word+4
pid equ cmdline+4
append equ pid+2
temp equ append+2
argc equ temp+4
token equ argc+2
space equ token+2
stream equ space+3
pipesem equ stream+4
inpipe2 equ pipesem+4
jobflag equ inpipe2+2
inpipe equ jobflag+2
waitpid equ inpipe+2
end equ waitpid+4
; subroutine (4:waitpid,2:inpipe,2:jobflag,2:inpipe2,4:pipesem,4:stream),space
tsc
sec
sbc #space-1
tcs
phd
tcd
ph4 #1024
jsl ~NEW
sta cmdline
stx cmdline+2
lda #0
sta [cmdline]
jsl alloc1024
sta word
stx word+2
ph4 #MAXARG*4
jsl ~NEW
sta argv
stx argv+2
stz srcfile
stz srcfile+2
stz dstfile
stz dstfile+2
stz errfile
stz errfile+2
stz argc
stz pipefds
stz pipefds+2
lda #-3
sta [waitpid]
loop pei (word+2)
pei (word)
pei (stream+2)
pei (stream)
jsl gettoken
sta token
asl a
tax
jmp (toktbl,x)
toktbl dc a2'loop'
dc a2'tok_word'
dc a2'tok_bar'
dc a2'tok_amp'
dc a2'tok_semi'
dc a2'tok_gt'
dc a2'tok_gtgt'
dc a2'tok_gtamp'
dc a2'tok_gtgtamp'
dc a2'tok_lt'
dc a2'tok_nl'
dc a2'tok_eof'
dc a2'tok_error'
;
; Parse a word token
;
tok_word if2 argc,ne,#MAXARG,word1
lda #err00 ;Too many arguments
jmp error
word1 pei (word+2)
pei (word)
jsr cstrlen
inc a
pea 0
pha
jsl ~NEW
sta temp
stx temp+2
ora temp+2
bne word2
lda #err01 ;Out of memory for arguments
jmp error
word2 lda argc ;Copy word to argv[argc]
asl2 a
tay
lda temp
sta [argv],y
lda temp+2
iny2
sta [argv],y
pei (word+2)
pei (word)
pei (temp+2)
pei (temp)
jsr copycstr
stz count ;count illegal characters in word
ldy #0
illword lda [word],y
and #$FF
beq appword
if2 @a,eq,#' ',incword
if2 @a,eq,#'&',incword
if2 @a,eq,#'|',incword
if2 @a,eq,#'<',incword
if2 @a,eq,#'>',incword
if2 @a,eq,#';',incword
bra nextword
incword inc count
nextword iny
bra illword
appword pei (word+2) ;append word to current command line
pei (word)
pei (cmdline+2)
pei (cmdline)
jsr cstrlen
tay
ldx argc
beq nospace
lda #' '
sta [cmdline],y
iny
nospace lda count
beq noquote
lda [word]
and #$FF
cmp #'"'
bne doquote
stz count
bra noquote
doquote lda #'"'
sta [cmdline],y
iny
inc count
noquote pei (cmdline+2)
add2 @y,cmdline,@a
pha
jsr copycstr
lda count
beq noquote2
pei (cmdline+2)
pei (cmdline)
jsr cstrlen
tay
lda #'"'
sta [cmdline],y
iny
lda #0
sta [cmdline],y
noquote2 inc argc ;increment argument count
goloop jmp loop
;
; Parse a '<' token
;
tok_lt lda srcfile
ora srcfile+2
beq lt1
lda #err02 ;Extra < encountered
jmp error
lt1 lda inpipe
beq lt2
lda #err09 ;< conflicts with |
jmp error
lt2 jsl alloc1024
stx srcfile+2
sta srcfile
phx
pha
pei (stream+2)
pei (stream)
jsl gettoken
if2 @a,eq,#T_WORD,goloop
lda #err03 ;Illegal < specified
jmp error
;
; Parse a '>' or '>>'
;
tok_gt anop
tok_gtgt lda dstfile
ora dstfile+2
beq gt1
lda #err04 ;Extra > or >> encountered
jmp error
gt1 jsl alloc1024
stx dstfile+2
sta dstfile
phx
pha
pei (stream+2)
pei (stream)
jsl gettoken
if2 @a,eq,#T_WORD,gt2
lda #err05 ;Illegal > or >> specified
jmp error
gt2 stz append
if2 token,ne,#T_GTGT,gt3
inc append
gt3 jmp loop
;
; Parse a '>&' or '>>&'
;
tok_gtamp anop
tok_gtgtamp lda errfile
ora errfile+2
beq ga1
lda #err06 ;Extra >& or >>& encountered
jmp error
ga1 jsl alloc1024
stx errfile+2
sta errfile
phx
pha
pei (stream+2)
pei (stream)
jsl gettoken
if2 @a,eq,#T_WORD,ga2
lda #err07 ;Illegal >& or >>& specified
jmp error
ga2 stz errappend
if2 token,ne,#T_GTGTAMP,ga3
inc errappend
ga3 jmp loop
;
; Parse a command terminator
;
tok_bar anop
tok_amp anop
tok_semi anop
tok_nl anop
tok_eof anop
lda argc ;terminate the argv list
bne nonnull
lda #0
sta [waitpid]
lda #T_NULL
jmp exit
nonnull asl2 a
tay
lda #0
sta [argv],y
iny2
sta [argv],y
;
; see if there is a conflict between >,>> with |
;
lda token
if2 @a,ne,#T_BAR,runit
lda dstfile
ora dstfile+2
beq bar2
lda #err08 ;> or >> conflicts with |
jmp error
bar2 clc
tdc
adc #pipefds
ldx #0
pipe @xa
;what if pipes return errors?
runit pei (argc)
pei (argv+2)
pei (argv)
pei (srcfile+2)
pei (srcfile)
pei (dstfile+2)
pei (dstfile)
pei (errfile+2)
pei (errfile)
pei (append)
pei (errappend)
ldx #0
if2 token,ne,#T_AMP,run2
inx
run2 phx
pei (cmdline+2)
pei (cmdline)
pei (jobflag)
pei (inpipe)
pei (pipefds+2)
pei (inpipe2)
pei (pipefds)
pei (pipesem+2)
pei (pipesem)
jsl invoke
sta pid
cmp #-1
beq exit
if2 token,ne,#T_BAR,run3
pei (waitpid+2)
pei (waitpid)
pei (pipefds)
pei (jobflag)
pei (pipefds+2)
pei (pipesem+2)
pei (pipesem)
pei (stream+2)
pei (stream)
jsl command
bra exit
run3 lda pid
sta [waitpid]
lda token
; clean up
exit pha
lda dstfile
ora dstfile+2
beq ex1
ldx dstfile+2
lda dstfile
jsl free1024
ex1 anop
lda srcfile
ora srcfile+2
beq ex2
ldx srcfile+2
lda srcfile
jsl free1024
ex2 anop
lda errfile
ora errfile+2
beq ex3
ldx errfile+2
lda errfile
jsl free1024
ex3 anop
ldx word+2
lda word
jsl free1024
ply
lda space
sta end-3
lda space+1
sta end-2
pld
tsc
clc
adc #end-4
tcs
tya
rtl
error ldx #^err00
jsr errputs
tok_error pei (cmdline+2)
pei (cmdline)
jsl nullfree
exit1a pei (argc)
pei (argv+2)
pei (argv)
jsl argfree
lda #-1
jmp exit
err00 dc c'gsh: Too many arguments, so no dessert tonight.',h'0d00'
err01 dc c'gsh: Not enough memory for arguments.',h'0d00'
err02 dc c'gsh: Extra ''<'' encountered.',h'0d00'
err03 dc c'gsh: No file specified for ''<''.',h'0d00'
err04 dc c'gsh: Extra ''>'' or ''>>'' encountered.',h'0d00'
err05 dc c'gsh: No file specified for ''>'' or ''>>''.',h'0d00'
err06 dc c'gsh: Extra ''>&'' or ''>>&'' encountered.',h'0d00'
err07 dc c'gsh: No file specified for ''>&'' or ''>>&''.',h'0d00'
err08 dc c'gsh: ''|'' conflicts with ''>'' or ''>>''.',h'0d00'
err09 dc c'gsh: ''|'' conflicts with ''<''.',h'0d00'
END
**************************************************************************
*
* dispose the argv
*
**************************************************************************
argfree START
space equ 0
subroutine (2:argc,4:argv),space
free1 lda argc
beq free2
dec a
asl2 a
tay
lda [argv],y
tax
iny2
lda [argv],y
pha
phx
jsl nullfree
dec argc
bra free1
free2 pei (argv+2)
pei (argv)
jsl nullfree
return
END
**************************************************************************
*
* Interpret a shell script
* This is overly complicated so that it can be run concurrently.
*
**************************************************************************
ShellExec START
using vardata
using global
count equ 1
data equ count+2
CRec equ data+4
RRec equ CRec+4
NRec equ RRec+4
ORec equ NRec+4
ptr equ ORec+4
space equ ptr+4
jobflag equ space+3
argv equ jobflag+2
argc equ argv+4
path equ argc+2
end equ path+4
; subroutine (4:path,2:argc,4:argv,2:jobflag),space
tsc
sec
sbc #space-1
tcs
phd
tcd
wait ldy mutex
beq wait0
cop $7F
bra wait
wait0 inc mutex
;
; set the variables 0..argc
;
lda argc
jeq skipvar
stz count
parmloop lda count
asl2 a
tay
lda [argv],y
sta setparm+4
iny2
lda [argv],y
sta setparm+6
lda count
cmp #10
bcs num1
short a
adc #'0'
sta num+2
long a
ld4 num+2,setparm
bra setit
num1 cmp #100
bcs num2
Int2Dec (@a,#num+1,#2,#0)
ld4 num+1,setparm
bra setit
num2 Int2Dec (@a,#num,#3,#0)
ld4 num,setparm
setit ph4 setparm
jsr c2pstr2
phx
pha
stx setparm+2
sta setparm
ph4 setparm+4
jsr c2pstr2
phx
pha
stx setparm+4+2
sta setparm+4
Set_Variable setparm
jsl nullfree
jsl nullfree
inc count
lda count
cmp argc
jcc parmloop
skipvar dec mutex
ph4 #4 ;Close parms
jsl ~NEW
sta CRec
stx CRec+2
ph4 #10 ;Open parms
jsl ~NEW
sta ORec
stx ORec+2
ph4 #12 ;NewLine parms
jsl ~NEW
sta NRec
stx NRec+2
ph4 #16 ;Read parms
jsl ~NEW
sta RRec
stx RRec+2
ph4 #1000 ;data buffer
jsl ~NEW
sta data
stx data+2
pei (path+2) ;Convert filename to GS/OS string
pei (path)
jsr c2gsstr
ldy #4
sta [ORec],y
sta ptr
iny2
txa
sta [ORec],y
sta ptr+2
ldy #8
lda #1 ;Read access only
sta [ORec],y
lda #3 ;Open the file
sta [ORec]
pei (ORec+2)
pei (ORec)
ph2 #$2010 ;OPEN
jsl $E100B0
bcc ok
sta Err
Error Err
jmp done
awshit sta Err
Error Err
jmp almostdone
ok ldy #2 ;Copy file ref num
lda [ORec],y
sta [NRec],y
sta [RRec],y
sta [CRec],y
lda #4 ;Do NewLine
sta [NRec]
ldy #4
lda #$7F
sta [NRec],y
iny2
lda #1
sta [NRec],y
iny2
lda #NLTable
sta [NRec],y
iny2
lda #^NLTable
sta [NRec],y
pei (NRec+2)
pei (NRec)
ph2 #$2011 ;NEWLINE
jsl $E100B0
bcs awshit
lda #4 ;Set up read parm
sta [RRec]
tay
lda data
sta [RRec],y
iny2
lda data+2
sta [RRec],y
iny2
lda #1000
sta [RRec],y
iny2
lda #0
sta [RRec],y
ReadLoop anop
pei (RRec+2)
pei (RRec)
ph2 #$2012 ;READ
jsl $E100B0
bcs almostdone
ldy #12
lda [RRec],y
tay
lda #0
sta [data],y
lda varecho
beq noecho
ldx data+2
lda data
jsr puts
jsr newline
noecho lda [data]
and #$FF
if2 @a,eq,#'#',ReadLoop
pei (data+2)
pei (data)
* ph2 #0
* ph2 #1
pei (jobflag)
jsl execute
lda exitamundo
bne almostdone
bra ReadLoop
almostdone anop
stz exitamundo
lda #1
sta [CRec]
pei (CRec+2)
pei (CRec)
ph2 #$2014 ;CLOSE
jsl $E100B0
done pei (CRec+2)
pei (CRec)
jsl nullfree
pei (NRec+2)
pei (NRec)
jsl nullfree
pei (RRec+2)
pei (RRec)
jsl nullfree
pei (ORec+2)
pei (ORec)
jsl nullfree
pei (data+2)
pei (data)
jsl nullfree
pei (ptr+2)
pei (ptr)
jsl nullfree
exit1a anop
lda space+1
sta end-2
lda space
sta end-3
pld
tsc
clc
adc #end-4
tcs
rtl
NLTable dc h'0d'
Err ds 2
setparm ds 4
ds 4
num dc c'000',h'00'
mutex dc i'0'
END
**************************************************************************
*
* Execute a command line by calling command for each command in the buffer
*
**************************************************************************
execute START
exebuf equ 1
pipesem equ exebuf+4
ptr2 equ pipesem+2
waitstatus equ ptr2+4
ptr equ waitstatus+2
pid equ ptr+4
term equ pid+2
space equ term+2
jobflag equ space+3 ;set if not a job
cmdline equ jobflag+2
end equ cmdline+4
; subroutine (4:cmdline,2:jobflag),space
tsc
sec
sbc #space-1
tcs
phd
tcd
stz pipesem
stz waitstatus
pei (cmdline+2)
pei (cmdline)
jsl expandvars
phx
pha
sta ptr
stx ptr+2
jsl glob
phx
pha
sta ptr2
stx ptr2+2
jsl expandalias
phx
pha
sta exebuf
stx exebuf+2
ldx ptr+2
lda ptr
jsl free1024
ldx ptr2+2
lda ptr2
jsl free1024
lda exebuf
ora exebuf+2
bne loop
pla
pla
stz term
lda #0
jmp ouch
loop pea 0 ;Bank 0
tdc
clc
adc #pid
pha
pea 0
pei (jobflag)
pea 0
pea 0 ;Bank 0
tdc
clc
adc #pipesem
pha
pea 0 ;Bank 0
tdc
clc
adc #exebuf
pha
jsl command
sta term
bmi noerrexit
lda pid
beq nowait
cmp #-1
beq noerrexit
lda jobflag
beq jobwait
signal (#SIGINT,#0)
phx
pha
signal (#SIGSTOP,#0)
phx
pha
otherwait ldx #0
clc
tdc
adc #waitstatus
wait @xa
cmp pid
bne otherwait
lda waitstatus
and #$FF
cmp #$7F
beq otherwait
lda waitstatus
jsr setstatus
pla
plx
signal (#SIGSTOP,@xa)
pla
plx
signal (#SIGINT,@xa)
bra nowait
jobwait jsl pwait
sta waitstatus
nowait if2 term,eq,#T_EOF,noerrexit
lda [exebuf]
and #$FF
beq exit
jmp loop
noerrexit stz waitstatus ;non-forked builtins cannot return an error
exit jsl nullfree
lda term ;make sure we return -1 if error
bmi ouch
lda waitstatus
xba
and #$FF
ouch tay
lda space+1
sta end-2
lda space
sta end-3
pld
tsc
clc
adc #end-4
tcs
tya
rtl
END
**************************************************************************
*
* System() call vector
*
**************************************************************************
system START
retval equ 0
space equ retval+2
subroutine (4:str),space ;need the phk/plb
pei (str+2)
pei (str)
ph2 #1 ;tells execute we're called by system
jsl execute
sta retval
return 2:retval
END