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BSD 4_1_snap release
[unix-history] / usr / src / cmd / pxp / doprnt.c
# sccsid = "@(#)doprnt.c 1.1 (Berkeley) 3/2/81";
# C library -- conversions
.globl __doprnt
.globl __strout
#define flags r10
#define literb 0
#define liter 1
#define ndfndb 0
#define ndfnd 1
#define ljustb 1
#define ljust 2
#define zfillb 2
#define zfill 4
#define precb 3
#define prec 8
#define psignb 4
#define psign 16
#define gflagb 5
#define gflag 32
#define width r9
#define ndigit r8
#define fdesc -4(fp)
#define exp -8(fp)
#define sign -9(fp)
.set one,010 # 1.0 in floating immediate
.set ch.zer,'0 # cpp doesn't like single appostrophes
.align 1
__doprnt:
.word 0xfc0 # uses r11-r6
subl2 $128,sp
movl 4(ap),r11 # addr of format string
movl 12(ap),fdesc # output FILE ptr
movl 8(ap),ap # addr of first arg
loop:
movl r11,r0 # current point in format
bicl2 $liter,flags # no literal characters yet
L1: movb (r11)+,width # next character of format
beql L2 # end of format string
cmpb width,$'%
beql L2 # warning character
bisl2 $liter,flags # literal character
jbr L1
L2: blbc flags,L3 # bbc $literb,flags,L3 # no literals in format
pushl fdesc # file pointer
pushl $0 # no left/right adjust
pushl r0 # addr
subl3 r0,r11,r1 # length
subl3 $1,r1,-(sp) # % or null not part of literal
calls $4,__strout # dump the literal
L3:
blbs width,L4 # % is odd; end of format?
ret # yes
# htab overlaps last 16 characters of ftab
ftab: .byte 0, 0, 0,'c,'d,'e,'f,'g, 0, 0, 0,'+,'l,'-,'.,'o
htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'a,'b,'c,'d,'e,'f
L4: movl sp,r5 # reset output buffer pointer
clrq r9 # width; flags ljustb,ndfndb,zfillb
L4a: movzbl (r11)+,r0 # supposed format
extzv $0,$5,r0,r1 # bottom 5 bits
L4b: cmpb r0,ftab[r1] # good enough?
jneq L6 # no
L4c: casel r1,$3,$22 # yes
L5: .word charac-L5 # c
.word decimal-L5 # d
.word scien-L5 # e
.word float-L5 # f
.word general-L5 # g
.word L6-L5 # h
.word L6-L5 # i
.word L6-L5 # j
.word plus-L5 # +
.word longorunsg-L5 # l
.word minus-L5 # -
.word dot-L5 # .
.word octal-L5 # o
.word gnum0-L5 # 0
.word gnum-L5 # 1
.word gnum-L5 # 2
.word gnum-L5 # 3
.word gnum-L5 # 4
.word gnum-L5 # 5
.word gnum-L5 # 6
.word gnum-L5 # 7
.word gnum-L5 # 8
.word gnum-L5 # 9
L6: jbcs $5,r0,L4b # capitals same as small
cmpb r0,$'s
jeql string
cmpb r0,$'x
jeql hex
cmpb r0,$'u
jeql unsigned
cmpb r0,$'r
jeql remote
movzbl -1(r11),r0 # orginal "format" character
cmpb r0,$'*
jeql indir
L9: movb r0,(r5)+ # print the unfound character
jbr prbuf
nulstr:
.byte '(,'n,'u,'l,'l,'),0
string:
movl ndigit,r0
jbs $precb,flags,L20 # max length was specified
mnegl $1,r0 # default max length
L20: movl (ap)+,r2 # addr first byte
bneq L21
movab nulstr,r2
L21: locc $0,r0,(r2) # find the zero at the end
movl r1,r5 # addr last byte +1
movl r2,r1 # addr first byte
jbr prstr
longorunsg:
movb (r11)+,r0
cmpb r0,$'o
jeql loct
cmpb r0,$'x
jeql lhex
cmpb r0,$'d
jeql long
cmpb r0,$'u
jeql lunsigned
decl r11
jbr unsigned
loct:
octal:
movl $30,r2 # init position
movl $3,r3 # field width
movl $10,r4 # result length -1
jbr L10
lhex:
hex:
movl $28,r2 # init position
movl $4,r3 # field width
movl $7,r4 # result length -1
L10: mnegl r3,r6 # increment
clrl r1
movl (ap)+,r0 # fetch arg
L11: extzv r2,r3,r0,r1 # pull out a digit
movb htab[r1],(r5)+ # convert to character
L12: acbl $0,r6,r2,L11 # continue until done
clrb (r5) # flag end
skpc $'0,r4,(sp) # skip over leading zeroes
jbr prstr
patdec: # editpc pattern for decimal printing
.byte 0xA9 # eo$float 9
.byte 0x01 # eo$end_float
.byte 0x91 # eo$move 1
.byte 0 # eo$end
long:
decimal:
cvtlp (ap)+,$10,(sp) # 10 digits max
L14: editpc $10,(sp),patdec,8(sp) # ascii at 8(sp); r5=end+1
skpc $' ,$10,8(sp) # skip leading blanks; r1=first
prstr: # r1=addr first byte; r5=addr last byte +1
cvtbl $' ,-(sp) # blank fill
jbc $zfillb,flags,L15
cvtbl $'0,(sp) # zero fill
L15: pushl fdesc # FILE
subl2 r1,r5 # r5=actual length=end+1-first
subl3 r5,width,r0 # if >0, how much to fill
bgeq L24
clrl r0 # no fill
L24: jbs $ljustb,flags,L25
mnegl r0,r0
L25: pushl r0 # fill count
pushl r1 # addr first byte
pushl r5 # length
calls $5,__strout
jbr loop
pone: .byte 0x1C # packed 1
unsigned:
lunsigned:
extzv $1,$31,(ap),r0 # right shift logical 1 bit
cvtlp r0,$10,(sp) # convert [n/2] to packed
movp $10,(sp),8(sp) # copy packed
addp4 $10,8(sp),$10,(sp) # 2*[n/2] in packed, at (sp)
blbc (ap)+,L14 # n was even
addp4 $1,pone,$10,(sp) # n was odd
jbr L14
charac:
movl $4,r0 # chars per word
L18: movb (ap)+,(r5)+ # transfer char
bneq L19
decl r5 # omit null characters
L19: sobgtr r0,L18
prbuf:
movl sp,r1 # addr first byte
jbr prstr
plus: bisl2 $psign,flags # always print sign for floats
jbr L4a
minus: bisl2 $ljust,flags # left justification, please
jbr L4a
gnum0: jbs $ndfndb,flags,gnum
jbs $precb,flags,gnump # ignore when reading precision
bisl2 $zfill,flags # leading zero fill, please
gnum: jbs $precb,flags,gnump
moval (width)[width],width # width *= 5;
movaw -ch.zer(r0)[width],width # width = 2*witdh + r0 - '0';
jbr gnumd
gnump: moval (ndigit)[ndigit],ndigit # ndigit *= 5;
movaw -ch.zer(r0)[ndigit],ndigit # ndigit = 2*ndigit + r0 - '0';
gnumd: bisl2 $ndfnd,flags # digit seen
jbr L4a
dot: clrl ndigit # start on the precision
bisl2 $prec,flags
bicl2 $ndfnd,flags
jbr L4a
indir: movl (ap)+,ndigit # width specified by parameter
jbr gnumd
remote: movl (ap)+,ap
movl (ap)+,r11
jbr loop
float:
bsbw fltcvt
fltg: jbs $ndfndb,flags,float1
movl $6,ndigit # default # digits to right of decpt.
float1: addl3 exp,ndigit,r7
movl r7,r6 # for later "underflow" checking
bgeq fxplrd
clrl r7 # poor programmer planning
fxplrd: cmpl r7,$31 # expressible in packed decimal?
bleq fnarro # yes
movl $31,r7
fnarro: subl3 $17,r7,r0 # where to round
ashp r0,$17,(sp),$5,r7,16(sp) # do it
bvc fnovfl
# band-aid for microcode error (spurious overflow)
clrl r0 # assume even length result
jlbc r7,fleven # right
movl $4,r0 # odd length result
fleven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow
bneq fnovfl
# end band-aid
aobleq $0,r6,fnovfl # if "underflow" then jump
movl r7,r0
incl exp
incl r7
ashp r0,$1,pone,$0,r7,16(sp)
ashl $-1,r7,r0 # displ to last byte
bisb2 sign,16(sp)[r0] # insert sign
fnovfl:
movc3 $4,patsci,(sp)
clrl r6 # # digits moved so far
movl exp,r0
bleq fexpng
bsbb patmov # digits to left of decpt.
fexpng: tstl ndigit
jeql fnodp
movc3 $2,fpatdp,(r3)
tstl exp
bgeq fxppos
addl3 exp,ndigit,r6
bgeq flfakl
clrl r6 # it's all fill
flfakl: subl3 r6,$31,r6 # fake length for patmov
flfill: movc3 $2,fpatzf,(r3) # zero fill to right of dec.pt
fxppos: movl ndigit,r0
bsbb patmov
fnodp: sobgeq r6,fledit # must move at least 1 digit
movl $31,r6 # none moved; fake it
aobleq $1,ndigit,flfill # with a one-character zero fill
fledit: editpc r7,16(sp),(sp),32(sp)
jbr prflt
patexp: .byte 0x03 # eo$set_signif
.byte 0x44,'e # eo$insert 'e
.byte 0x42,'+ # eo$load_plus '+
.byte 0x04 # eo$store_sign
.byte 0x92 # eo$move 2
.byte 0 # eo$end
patsci: .byte 0x42,'+ # eo$load_plus '+
.byte 0x03 # eo$set_signif
.byte 0x04 # eo$store_sign
.byte 0x91 # eo$move 1
fpatdp: .byte 0x44,'. # eo$insert '.
fpatzf: .byte 0x40,'0 # eo$load_fill '0
# construct pattern at (r3) to move r0 digits in editpc;
# r6 digits already moved for this number
patmov:
movb $0x90,r2 # eo$move
subl3 r6,$31,r1 # # digits remaining in packed
addl2 r0,r6
cmpl r0,r1 # enough digits remaining?
bleq patsml # yes
tstl exp # zero 'fill'; before or after rest?
bgeq pataft # after
pushl r1 # # digits remaining
movb $0x80,r2 # eo$fill
subl3 $31,r6,r0 # number of fill bytes
bsbb patsml # recursion!
movl (sp)+,r0
movb $0x90,r2 # eo$move
jbr patsml
pataft: movl r1,r0 # last of the 31
bsbb patsml # recursion!
subl3 $31,r6,r0 # number of fill bytes
movb $0x80,r2 # eo$fill
patsml: tstl r0
bleq patzer # DEC doesn't like repetition counts of 0
mnegl $15,r1 # 15 digits at a time
subl2 r1,r0 # counteract acbl
jbr pattst
patmlp: bisb3 r2,$15,(r3)+ # 15
pattst: acbl $16,r1,r0,patmlp # until <= 15 left
bisb3 r2,r0,(r3)+ # rest
patzer: clrb (r3) # eo$end
rsb
scien:
bsbw fltcvt # get packed digits
scig: incl ndigit
jbs $ndfndb,flags,L23
movl $7,ndigit
L23: subl3 $17,ndigit,r0 # rounding position
ashp r0,$17,(sp),$5,ndigit,16(sp) # shift and round
bvc snovfl
# band-aid for microcode error (spurious overflow)
clrl r0 # assume even length result
jlbc ndigit,sceven # right
movl $4,r0 # odd length result
sceven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow
bneq snovfl
# end band-aid
incl exp # rounding overflowed to 100...
subl3 $1,ndigit,r0
ashp r0,$1,pone,$0,ndigit,16(sp)
ashl $-1,ndigit,r0 # displ to last byte
bisb2 sign,16(sp)[r0] # insert sign
snovfl:
jbc $gflagb,flags,enotg # not %g format
# find trailing zeroes in packed number
ashl $-1,ndigit,r0
addl2 r3,r0 # addr of l.s.digit and sign
movl $4,r1 # bit position of digit
movl ndigit,r7 # current length of packed
jbr gtz
gtz1: xorl2 $4,r1 # position of next digit
bneq gtz # same byte
decl r0 # different byte
gtz: cmpv r1,$4,(r0),$0 # a trailing zero?
jneq gntz
sobgtr r7,gtz1
incl r7
gntz: # r7: minimum width of fraction
cmpl exp,$-4
jleq eg # small exponents use %e
subl3 r7,exp,r0
cmpl $5,r0
jleq eg # so do (w+5) <= exp
tstl r0 # rest use %f
jleq fg # did we trim too many trailing zeroes?
movl exp,r7 # yes
fg: subl3 ndigit,r7,r0
ashp r0,ndigit,16(sp),$0,r7,(sp)
movp r7,(sp),16(sp)
subl3 exp,r7,ndigit # correct ndigit for %f
jbr fnovfl
eg: subl3 ndigit,r7,r0
ashp r0,ndigit,16(sp),$0,r7,(sp)
movp r7,(sp),16(sp)
movl r7,ndigit # packed number has been trimmed
enotg:
movc3 $7,patsci,(sp)
movl $1,r6 # 1P
subl3 $1,ndigit,r0 # digits after dec.pt
bsbw patmov
editpc ndigit,16(sp),(sp),32(sp) # 32(sp)->result, r5->(end+1)
decl exp # compensate: 1 digit left of dec.pt
cvtlp exp,$2,(sp) # exponent
editpc $2,(sp),patexp,(r5)
prflt: movab 32(sp),r1
jbs $psignb,flags,prflt1
cmpb (r1)+,$'+
beql prflt1
decl r1
prflt1: skpc $' ,$63,(r1)
jbr prstr
general:
jbcs $gflagb,flags,scien
jbr scien # safety net
# convert double-floating at (ap) to 17-digit packed at (sp),
# set 'sign' and 'exp', advance ap.
fltcvt:
clrb sign
movd (ap)+,r5
jeql fzero
bgtr fpos
mnegd r5,r5
incb sign
fpos:
extzv $7,$8,r5,r2 # exponent of 2
movaw -0600(r2)[r2],r2 # unbias and mult by 3
bgeq epos
subl2 $9,r2
epos: divl2 $10,r2
bsbb expten
cmpd r0,r5
bgtr ceil
incl r2
ceil: movl r2,exp
mnegl r2,r2
cmpl r2,$29 # 10^(29+9) is all we can handle
bleq getman
muld2 ten16,r5
subl2 $16,r2
getman: addl2 $9,r2 # -ceil(log10(x)) + 9
bsbb expten
emodd r0,r4,r5,r0,r5 # (r0+r4)*r5; r0=int, r5=frac
fz1: cvtlp r0,$9,16(sp) # leading 9 digits
ashp $8,$9,16(sp),$0,$17,4(sp) # as top 9 of 17
emodd ten8,$0,r5,r0,r5
cvtlp r0,$8,16(sp) # trailing 8 digits
addp4 $8,16(sp),$17,4(sp) # combine leading and trailing
bisb2 sign,12(sp) # and insert sign
rsb
fzero: clrl r0
movl $1,exp # 0.000e+00 and 0.000 rather than 0.000e-01 and .000
jbr fz1
# return 10^r2 as a double float in r0||r1 and 8 extra bits of precision in r4
# preserve r2, r5||r6
expten:
movd $one,r0 # begin computing 10^exp10
clrl r4 # bit counter
movad ten1,r3 # table address
tstl r2
bgeq e10lp
mnegl r2,r2 # get absolute value
jbss $6,r2,e10lp # flag as negative
e10lp: jbc r4,r2,el1 # want this power?
muld2 (r3),r0 # yes
el1: addl2 $8,r3 # advance to next power
aobleq $5,r4,e10lp # through 10^32
jbcc $6,r2,el2 # correct for negative exponent
divd3 r0,$one,r0 # by taking reciprocal
mnegl r2,r2
el2: clrl r4 # 8 extra bits of precision
rsb
# powers of ten
.align 3
ten1: .word 0x4220,0,0,0
ten2: .word 0x43c8,0,0,0
ten4: .word 0x471c,0x4000,0,0
ten8: .word 0x4dbe,0xbc20,0,0
ten16: .word 0x5b0e,0x1bc9,0xbf04,0
ten32: .word 0x759d,0xc5ad,0xa82b,0x70b6
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.