# C library -- conversions
.set one,010 # 1.0 in floating immediate
.set ch.zer,'0 # cpp doesn't like single appostrophes
.word 0xfc0 # uses r11-r6
movl 4(ap),r11 # addr of format string
movl 12(ap),fdesc # output FILE ptr
movl 8(ap),ap # addr of first arg
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
beql L2 # warning character
bisl2 $liter,flags # literal character
L2: blbc flags,L3 # bbc $literb,flags,L3 # no literals in format
pushl fdesc # file pointer
pushl $0 # no left/right adjust
subl3 $1,r1,-(sp) # % or null not part of literal
calls $4,__strout # dump the literal
blbs width,L4 # % is odd; end of format?
# 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?
L4c: casel r1,$3,$22 # yes
L6: jbcs $5,r0,L4b # capitals same as small
movzbl -1(r11),r0 # orginal "format" character
L9: movb r0,(r5)+ # print the unfound character
.byte '(,'n,'u,'l,'l,'),0
jbs $precb,flags,L20 # max length was specified
mnegl $1,r0 # default max length
L20: movl (ap)+,r2 # addr first byte
L21: locc $0,r0,(r2) # find the zero at the end
movl r1,r5 # addr last byte +1
movl r2,r1 # addr first byte
movl $30,r2 # init position
movl $10,r4 # result length -1
movl $28,r2 # init position
movl $7,r4 # result length -1
L10: mnegl r3,r6 # increment
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
skpc $'0,r4,(sp) # skip over leading zeroes
patdec: # editpc pattern for decimal printing
.byte 0x01 # eo$end_float
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
cvtbl $'0,(sp) # zero fill
subl2 r1,r5 # r5=actual length=end+1-first
subl3 r5,width,r0 # if >0, how much to fill
L24: jbs $ljustb,flags,L25
L25: pushl r0 # fill count
pushl r1 # addr first byte
pone: .byte 0x1C # packed 1
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
movl $4,r0 # chars per word
L18: movb (ap)+,(r5)+ # transfer char
decl r5 # omit null characters
movl sp,r1 # addr first byte
plus: bisl2 $psign,flags # always print sign for floats
minus: bisl2 $ljust,flags # left justification, please
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';
gnump: moval (ndigit)[ndigit],ndigit # ndigit *= 5;
movaw -ch.zer(r0)[ndigit],ndigit # ndigit = 2*ndigit + r0 - '0';
gnumd: bisl2 $ndfnd,flags # digit seen
dot: clrl ndigit # start on the precision
indir: movl (ap)+,ndigit # width specified by parameter
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
clrl r7 # poor programmer planning
fxplrd: cmpl r7,$31 # expressible in packed decimal?
fnarro: subl3 $17,r7,r0 # where to round
ashp r0,$17,(sp),$5,r7,16(sp) # do it
# band-aid for microcode error (spurious overflow)
clrl r0 # assume even length result
movl $4,r0 # odd length result
fleven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow
aobleq $0,r6,fnovfl # if "underflow" then jump
ashp r0,$1,pone,$0,r7,16(sp)
ashl $-1,r7,r0 # displ to last byte
bisb2 sign,16(sp)[r0] # insert sign
clrl r6 # # digits moved so far
bsbb patmov # digits to left of decpt.
flfakl: subl3 r6,$31,r6 # fake length for patmov
flfill: movc3 $2,fpatzf,(r3) # zero fill to right of dec.pt
fnodp: sobgeq r6,fledit # must move at least 1 digit
movl $31,r6 # none moved; fake it
aobleq $1,ndigit,flfill # with a one-character zero fill
fledit: editpc r7,16(sp),(sp),32(sp)
patexp: .byte 0x03 # eo$set_signif
.byte 0x44,'e # eo$insert 'e
.byte 0x42,'+ # eo$load_plus '+
.byte 0x04 # eo$store_sign
patsci: .byte 0x42,'+ # eo$load_plus '+
.byte 0x03 # eo$set_signif
.byte 0x04 # eo$store_sign
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
subl3 r6,$31,r1 # # digits remaining in packed
cmpl r0,r1 # enough digits remaining?
tstl exp # zero 'fill'; before or after rest?
pushl r1 # # digits remaining
subl3 $31,r6,r0 # number of fill bytes
pataft: movl r1,r0 # last of the 31
subl3 $31,r6,r0 # number of fill bytes
bleq patzer # DEC doesn't like repetition counts of 0
mnegl $15,r1 # 15 digits at a time
subl2 r1,r0 # counteract acbl
patmlp: bisb3 r2,$15,(r3)+ # 15
pattst: acbl $16,r1,r0,patmlp # until <= 15 left
patzer: clrb (r3) # eo$end
bsbw fltcvt # get packed digits
L23: subl3 $17,ndigit,r0 # rounding position
ashp r0,$17,(sp),$5,ndigit,16(sp) # shift and round
# 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
incl exp # rounding overflowed to 100...
ashp r0,$1,pone,$0,ndigit,16(sp)
ashl $-1,ndigit,r0 # displ to last byte
bisb2 sign,16(sp)[r0] # insert sign
jbc $gflagb,flags,enotg # not %g format
# find trailing zeroes in packed number
addl2 r3,r0 # addr of l.s.digit and sign
movl $4,r1 # bit position of digit
movl ndigit,r7 # current length of packed
gtz1: xorl2 $4,r1 # position of next digit
gtz: cmpv r1,$4,(r0),$0 # a trailing zero?
gntz: # r7: minimum width of fraction
jleq eg # small exponents use %e
jleq eg # so do (w+5) <= exp
jleq fg # did we trim too many trailing zeroes?
ashp r0,ndigit,16(sp),$0,r7,(sp)
subl3 exp,r7,ndigit # correct ndigit for %f
ashp r0,ndigit,16(sp),$0,r7,(sp)
movl r7,ndigit # packed number has been trimmed
subl3 $1,ndigit,r0 # digits after dec.pt
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)
prflt1: skpc $' ,$63,(r1)
# convert double-floating at (ap) to 17-digit packed at (sp),
# set 'sign' and 'exp', advance ap.
extzv $7,$8,r5,r2 # exponent of 2
movaw -0600(r2)[r2],r2 # unbias and mult by 3
cmpl r2,$29 # 10^(29+9) is all we can handle
getman: addl2 $9,r2 # -ceil(log10(x)) + 9
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
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
movl $1,exp # 0.000e+00 and 0.000 rather than 0.000e-01 and .000
# return 10^r2 as a double float in r0||r1 and 8 extra bits of precision in r4
movd $one,r0 # begin computing 10^exp10
movad ten1,r3 # table address
mnegl r2,r2 # get absolute value
jbss $6,r2,e10lp # flag as negative
e10lp: jbc r4,r2,el1 # want this power?
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
el2: clrl r4 # 8 extra bits of precision
ten4: .word 0x471c,0x4000,0,0
ten8: .word 0x4dbe,0xbc20,0,0
ten16: .word 0x5b0e,0x1bc9,0xbf04,0
ten32: .word 0x759d,0xc5ad,0xa82b,0x70b6