1 /* @(#)doprnt.c 4.3 (Berkeley) 03/22/81 */ 2 # C library -- conversions 3 4 .globl __doprnt 5 .globl __flsbuf 6 7 #define vbit 1 8 #define flags r10 9 #define ndfnd 0 10 #define prec 1 11 #define zfill 2 12 #define minsgn 3 13 #define plssgn 4 14 #define numsgn 5 15 #define caps 6 16 #define blank 7 17 #define gflag 8 18 #define dpflag 9 19 #define width r9 20 #define ndigit r8 21 #define llafx r7 22 #define lrafx r6 23 #define fdesc -4(fp) 24 #define exp -8(fp) 25 #define sexp -12(fp) 26 #define nchar -16(fp) 27 #define sign -17(fp) 28 .set ch.zer,'0 # cpp doesn't like single appostrophes 29 30 .align 2 31 strtab: # translate table for detecting null and percent 32 .byte 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 33 .byte 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 34 .byte ' ,'!,'",'#,'$, 0,'&,'','(,'),'*,'+,',,'-,'.,'/ 35 .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,':,';,'<,'=,'>,'? 36 .byte '@,'A,'B,'C,'D,'E,'F,'G,'H,'I,'J,'K,'L,'M,'N,'O 37 .byte 'P,'Q,'R,'S,'T,'U,'V,'W,'X,'Y,'Z,'[,'\,'],'^,'_ 38 .byte '`,'a,'b,'c,'d,'e,'f,'g,'h,'i,'j,'k,'l,'m,'n,'o 39 .byte 'p,'q,'r,'s,'t,'u,'v,'w,'x,'y,'z,'{,'|,'},'~,127 40 .byte 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143 41 .byte 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159 42 .byte 160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175 43 .byte 176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191 44 .byte 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207 45 .byte 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223 46 .byte 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239 47 .byte 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255 48 49 strfoo: 50 clrl r4 # fix interrupt race 51 jbr strok # and try again 52 strmore: 53 movzbl (r1)+,r2 # one char 54 tstb strtab[r2] # translate 55 jeql stresc2 # bad guy in disguise (outbuf is full) 56 strout2: # enter here to force out r2; r0,r1 must be set 57 pushr $3 # save input descriptor 58 pushl fdesc # FILE 59 pushl r2 # the char 60 calls $2,__flsbuf # please empty the buffer and handle 1 char 61 tstl r0 # successful? 62 jgeq strm1 # yes 63 jbcs $31,nchar,strm1 # turn on sign bit of nchar to signify error 64 strm1: 65 incl nchar # count the char 66 popr $3 # get input descriptor back 67 strout: # enter via bsb with (r0,r1)=input descriptor 68 movab strtab,r3 # table address 69 movq *fdesc,r4 # output descriptor 70 jbs $31,r4,strfoo # negative count is a no no 71 strok: 72 addl2 r0,nchar # we intend to move this many chars 73 /******* Start bogus movtuc workaround *****/ 74 clrl r2 75 tstl r0 76 bleq movdon 77 movlp: 78 tstl r4 79 bleq movdon 80 movzbl (r1)+,r3 81 tstb strtab[r3] 82 bneq 1f 83 mnegl $1,r2 84 decl r1 85 brb movdon 86 1: 87 movb r3,(r5)+ 88 decl r4 89 sobgtr r0,movlp 90 /******* End bogus movtuc workaround *** 91 movtuc r0,(r1),$0,(r3),r4,(r5) 92 movpsl r2 /* squirrel away condition codes */ 93 /******* End equally bogus movtuc ****/ 94 movdon: movq r4,*fdesc /* update output descriptor */ 95 subl2 r0,nchar # some chars not moved 96 jbs $vbit,r2,stresc # terminated by escape? 97 sobgeq r0,strmore # no; but out buffer might be full 98 stresc: 99 rsb 100 stresc2: 101 incl r0 # fix the length 102 decl r1 # and the addr 103 movl $1<vbit,r2 # fake condition codes 104 rsb 105 106 errdone: 107 jbcs $31,nchar,prdone # set error bit 108 prdone: 109 movl nchar,r0 110 ret 111 112 .align 1 113 __doprnt: 114 .word 0xfc0 # uses r11-r6 115 movab -256(sp),sp # work space 116 movl 4(ap),r11 # addr of format string 117 movl 12(ap),fdesc # output FILE ptr 118 movl 8(ap),ap # addr of first arg 119 clrl nchar # number of chars transferred 120 loop: 121 movzwl $65535,r0 # pseudo length 122 movl r11,r1 # fmt addr 123 # comet sucks. 124 movq *fdesc,r4 125 subl3 r1,r5,r2 126 jlss lp1 127 cmpl r0,r2 128 jleq lp1 129 movl r2,r0 130 lp1: 131 # 132 bsbw strout # copy to output, stop at null or percent 133 movl r1,r11 # new fmt 134 jbc $vbit,r2,loop # if no escape, then very long fmt 135 tstb (r11)+ # escape; null or percent? 136 jeql prdone # null means end of fmt 137 138 movl sp,r5 # reset output buffer pointer 139 clrq r9 # width; flags 140 clrq r6 # lrafx,llafx 141 longorunsg: # we can ignore both of these distinctions 142 short: 143 L4a: 144 movzbl (r11)+,r0 # so capital letters can tail merge 145 L4: caseb r0,$' ,$'x-' # format char 146 L5: 147 .word space-L5 # space 148 .word fmtbad-L5 # ! 149 .word fmtbad-L5 # " 150 .word sharp-L5 # # 151 .word fmtbad-L5 # $ 152 .word fmtbad-L5 # % 153 .word fmtbad-L5 # & 154 .word fmtbad-L5 # ' 155 .word fmtbad-L5 # ( 156 .word fmtbad-L5 # ) 157 .word indir-L5 # * 158 .word plus-L5 # + 159 .word fmtbad-L5 # , 160 .word minus-L5 # - 161 .word dot-L5 # . 162 .word fmtbad-L5 # / 163 .word gnum0-L5 # 0 164 .word gnum-L5 # 1 165 .word gnum-L5 # 2 166 .word gnum-L5 # 3 167 .word gnum-L5 # 4 168 .word gnum-L5 # 5 169 .word gnum-L5 # 6 170 .word gnum-L5 # 7 171 .word gnum-L5 # 8 172 .word gnum-L5 # 9 173 .word fmtbad-L5 # : 174 .word fmtbad-L5 # ; 175 .word fmtbad-L5 # < 176 .word fmtbad-L5 # = 177 .word fmtbad-L5 # > 178 .word fmtbad-L5 # ? 179 .word fmtbad-L5 # @ 180 .word fmtbad-L5 # A 181 .word fmtbad-L5 # B 182 .word fmtbad-L5 # C 183 .word decimal-L5 # D 184 .word capital-L5 # E 185 .word fmtbad-L5 # F 186 .word capital-L5 # G 187 .word fmtbad-L5 # H 188 .word fmtbad-L5 # I 189 .word fmtbad-L5 # J 190 .word fmtbad-L5 # K 191 .word fmtbad-L5 # L 192 .word fmtbad-L5 # M 193 .word fmtbad-L5 # N 194 .word octal-L5 # O 195 .word fmtbad-L5 # P 196 .word fmtbad-L5 # Q 197 .word fmtbad-L5 # R 198 .word fmtbad-L5 # S 199 .word fmtbad-L5 # T 200 .word unsigned-L5 # U 201 .word fmtbad-L5 # V 202 .word fmtbad-L5 # W 203 .word hex-L5 # X 204 .word fmtbad-L5 # Y 205 .word fmtbad-L5 # Z 206 .word fmtbad-L5 # [ 207 .word fmtbad-L5 # \ 208 .word fmtbad-L5 # ] 209 .word fmtbad-L5 # ^ 210 .word fmtbad-L5 # _ 211 .word fmtbad-L5 # ` 212 .word fmtbad-L5 # a 213 .word fmtbad-L5 # b 214 .word charac-L5 # c 215 .word decimal-L5 # d 216 .word scien-L5 # e 217 .word float-L5 # f 218 .word general-L5 # g 219 .word short-L5 # h 220 .word fmtbad-L5 # i 221 .word fmtbad-L5 # j 222 .word fmtbad-L5 # k 223 .word longorunsg-L5 # l 224 .word fmtbad-L5 # m 225 .word fmtbad-L5 # n 226 .word octal-L5 # o 227 .word fmtbad-L5 # p 228 .word fmtbad-L5 # q 229 .word fmtbad-L5 # r 230 .word string-L5 # s 231 .word fmtbad-L5 # t 232 .word unsigned-L5 # u 233 .word fmtbad-L5 # v 234 .word fmtbad-L5 # w 235 .word hex-L5 # x 236 fmtbad: 237 movb r0,(r5)+ # print the unfound character 238 jeql errdone # dumb users who end the format with a % 239 jbr prbuf 240 capital: 241 bisl2 $1<caps,flags # note that it was capitalized 242 xorb2 $'a^'A,r0 # make it small 243 jbr L4 # and try again 244 245 string: 246 movl ndigit,r0 247 jbs $prec,flags,L20 # max length was specified 248 mnegl $1,r0 # default max length 249 L20: movl (ap)+,r2 # addr first byte 250 locc $0,r0,(r2) # find the zero at the end 251 movl r1,r5 # addr last byte +1 252 movl r2,r1 # addr first byte 253 jbr prstr 254 255 htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'a,'b,'c,'d,'e,'f 256 Htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'A,'B,'C,'D,'E,'F 257 258 octal: 259 movl $30,r2 # init position 260 movl $3,r3 # field width 261 movab htab,llafx # translate table 262 jbr L10 263 264 hex: 265 movl $28,r2 # init position 266 movl $4,r3 # field width 267 movab htab,llafx # translate table 268 jbc $caps,flags,L10 269 movab Htab,llafx 270 L10: mnegl r3,r6 # increment 271 clrl r1 272 addl2 $4,r5 # room for left affix (2) and slop [forced sign?] 273 movl (ap)+,r0 # fetch arg 274 L11: extzv r2,r3,r0,r1 # pull out a digit 275 movb (llafx)[r1],(r5)+ # convert to character 276 L12: acbl $0,r6,r2,L11 # continue until done 277 clrq r6 # lrafx, llafx 278 clrb (r5) # flag end 279 skpc $'0,$11,4(sp) # skip over leading zeroes 280 jbc $numsgn,flags,prn3 # easy if no left affix 281 tstl -4(ap) # original value 282 jeql prn3 # no affix on 0, for some reason 283 cmpl r3,$4 # were we doing hex or octal? 284 jneq L12a # octal 285 movb $'x,r0 286 jbc $caps,flags,L12b 287 movb $'X,r0 288 L12b: movb r0,-(r1) 289 movl $2,llafx # leading 0x for hex is an affix 290 L12a: movb $'0,-(r1) # leading zero for octal is a digit, not an affix 291 jbr prn3 # omit sign (plus, blank) massaging 292 293 unsigned: 294 lunsigned: 295 bicl2 $1<plssgn|1<blank,flags # omit sign (plus, blank) massaging 296 extzv $1,$31,(ap),r0 # right shift logical 1 bit 297 cvtlp r0,$10,(sp) # convert [n/2] to packed 298 movp $10,(sp),8(sp) # copy packed 299 addp4 $10,8(sp),$10,(sp) # 2*[n/2] in packed, at (sp) 300 blbc (ap)+,L14 # n was even 301 addp4 $1,pone,$10,(sp) # n was odd 302 jbr L14 303 304 patdec: # editpc pattern for decimal printing 305 .byte 0xAA # eo$float 10 306 .byte 0x01 # eo$end_float 307 .byte 0 # eo$end 308 309 decimal: 310 cvtlp (ap)+,$10,(sp) # 10 digits max 311 jgeq L14 312 incl llafx # minus sign is a left affix 313 L14: editpc $10,(sp),patdec,8(sp) # ascii at 8(sp); r5=end+1 314 skpc $' ,$11,8(sp) # skip leading blanks; r1=first 315 316 prnum: # r1=addr first byte, r5=addr last byte +1, llafx=size of signs 317 # -1(r1) vacant, for forced sign 318 tstl llafx 319 jneq prn3 # already some left affix, dont fuss 320 jbc $plssgn,flags,prn2 321 movb $'+,-(r1) # needs a plus sign 322 jbr prn4 323 prn2: jbc $blank,flags,prn3 324 movb $' ,-(r1) # needs a blank sign 325 prn4: incl llafx 326 prn3: jbs $prec,flags,prn1 327 movl $1,ndigit # default precision is 1 328 prn1: subl3 r1,r5,lrafx # raw width 329 subl2 llafx,lrafx # number of digits 330 subl2 lrafx,ndigit # number of leading zeroes needed 331 jleq prstr # none 332 addl2 llafx,r1 # where current digits start 333 pushl r1 # movcx gobbles registers 334 # check bounds on users who say %.300d 335 movab 32(r5)[ndigit],r2 336 subl2 fp,r2 337 jlss prn5 338 subl2 r2,ndigit 339 prn5: 340 # 341 movc3 lrafx,(r1),(r1)[ndigit] # make room in middle 342 movc5 $0,(r1),$ch.zer,ndigit,*(sp) # '0 fill 343 subl3 llafx,(sp)+,r1 # first byte addr 344 addl3 lrafx,r3,r5 # last byte addr +1 345 346 prstr: # r1=addr first byte; r5=addr last byte +1 347 # width=minimum width; llafx=len. left affix 348 # ndigit=<avail> 349 subl3 r1,r5,ndigit # raw width 350 subl3 ndigit,width,r0 # pad length 351 jleq padlno # in particular, no left padding 352 jbs $minsgn,flags,padlno 353 # extension for %0 flag causing left zero padding to field width 354 jbs $zfill,flags,padlz 355 # this bsbb needed even if %0 flag extension is removed 356 bsbb padb # blank pad on left 357 jbr padnlz 358 padlz: 359 movl llafx,r0 360 jleq padnlx # left zero pad requires left affix first 361 subl2 r0,ndigit # part of total length will be transferred 362 subl2 r0,width # and will account for part of minimum width 363 bsbw strout # left affix 364 padnlx: 365 subl3 ndigit,width,r0 # pad length 366 bsbb padz # zero pad on left 367 padnlz: 368 # end of extension for left zero padding 369 padlno: # remaining: root, possible right padding 370 subl2 ndigit,width # root reduces minimum width 371 movl ndigit,r0 # root length 372 p1: bsbw strout # transfer to output buffer 373 p3: jbc $vbit,r2,padnpct # percent sign (or null byte via %c) ? 374 decl r0 # yes; adjust count 375 movzbl (r1)+,r2 # fetch byte 376 movq *fdesc,r4 # output buffer descriptor 377 sobgeq r4,p2 # room at the out [inn] ? 378 bsbw strout2 # no; force it, then try rest 379 jbr p3 # here we go 'round the mullberry bush, ... 380 p2: movb r2,(r5)+ # hand-deposit the percent or null 381 incl nchar # count it 382 movq r4,*fdesc # store output descriptor 383 jbr p1 # what an expensive hiccup! 384 padnpct: 385 movl width,r0 # size of pad 386 jleq loop 387 bsbb padb 388 jbr loop 389 390 padz: 391 movb $'0,r2 392 jbr pad 393 padb: 394 movb $' ,r2 395 pad: 396 subl2 r0,width # pad width decreases minimum width 397 pushl r1 # save non-pad addr 398 movl r0,llafx # remember width of pad 399 subl2 r0,sp # allocate 400 movc5 $0,(r0),r2,llafx,(sp) # create pad string 401 movl llafx,r0 # length 402 movl sp,r1 # addr 403 bsbw strout 404 addl2 llafx,sp # deallocate 405 movl (sp)+,r1 # recover non-pad addr 406 rsb 407 408 pone: .byte 0x1C # packed 1 409 410 charac: 411 movl (ap)+,r0 # word containing the char 412 movb r0,(r5)+ # one byte, that's all 413 414 prbuf: 415 movl sp,r1 # addr first byte 416 jbr prstr 417 418 space: bisl2 $1<blank,flags # constant width e fmt, no plus sign 419 jbr L4a 420 sharp: bisl2 $1<numsgn,flags # 'self identifying', please 421 jbr L4a 422 plus: bisl2 $1<plssgn,flags # always print sign for floats 423 jbr L4a 424 minus: bisl2 $1<minsgn,flags # left justification, please 425 jbr L4a 426 gnum0: jbs $ndfnd,flags,gnum 427 jbs $prec,flags,gnump # ignore when reading precision 428 bisl2 $1<zfill,flags # leading zero fill, please 429 gnum: jbs $prec,flags,gnump 430 moval (width)[width],width # width *= 5; 431 movaw -ch.zer(r0)[width],width # width = 2*witdh + r0 - '0'; 432 jbr gnumd 433 gnump: moval (ndigit)[ndigit],ndigit # ndigit *= 5; 434 movaw -ch.zer(r0)[ndigit],ndigit # ndigit = 2*ndigit + r0 - '0'; 435 gnumd: bisl2 $1<ndfnd,flags # digit seen 436 jbr L4a 437 dot: clrl ndigit # start on the precision 438 bisl2 $1<prec,flags 439 bicl2 $1<ndfnd,flags 440 jbr L4a 441 indir: 442 jbs $prec,flags,in1 443 movl (ap)+,width # width specified by parameter 444 jgeq gnumd 445 xorl2 $1<minsgn,flags # parameterized left adjustment 446 mnegl width,width 447 jbr gnumd 448 in1: 449 movl (ap)+,ndigit # precision specified by paratmeter 450 jgeq gnumd 451 mnegl ndigit,ndigit 452 jbr gnumd 453 454 float: 455 jbs $prec,flags,float1 456 movl $6,ndigit # default # digits to right of decpt. 457 float1: bsbw fltcvt 458 addl3 exp,ndigit,r7 459 movl r7,r6 # for later "underflow" checking 460 bgeq fxplrd 461 clrl r7 # poor programmer planning 462 fxplrd: cmpl r7,$31 # expressible in packed decimal? 463 bleq fnarro # yes 464 movl $31,r7 465 fnarro: subl3 $17,r7,r0 # where to round 466 ashp r0,$17,(sp),$5,r7,16(sp) # do it 467 bvc fnovfl 468 # band-aid for microcode error (spurious overflow) 469 # clrl r0 # assume even length result 470 # jlbc r7,fleven # right 471 # movl $4,r0 # odd length result 472 #fleven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow 473 # bneq fnovfl 474 # end band-aid 475 aobleq $0,r6,fnovfl # if "underflow" then jump 476 movl r7,r0 477 incl exp 478 incl r7 479 ashp r0,$1,pone,$0,r7,16(sp) 480 ashl $-1,r7,r0 # displ to last byte 481 bisb2 sign,16(sp)[r0] # insert sign 482 fnovfl: 483 movab 16(sp),r1 # packed source 484 movl r7,r6 # packed length 485 pushab prnum # goto prnum after fall-through call to fedit 486 487 488 # enter via bsb 489 # r1=addr of packed source 490 # 16(r1) used to unpack source 491 # 48(r1) used to construct pattern to unpack source 492 # 48(r1) used to hold result 493 # r6=length of packed source (destroyed) 494 # exp=# digits to left of decimal point (destroyed) 495 # ndigit=# digits to right of decimal point (destroyed) 496 # sign=1 if negative, 0 otherwise 497 # stack will be used for work space for pattern and unpacked source 498 # exits with 499 # r1=addr of punctuated result 500 # r5=addr of last byte +1 501 # llafx=1 if minus sign inserted, 0 otherwise 502 fedit: 503 pushab 48(r1) # save result addr 504 movab 48(r1),r3 # pattern addr 505 movb $0x03,(r3)+ # eo$set_signif 506 movc5 $0,(r1),$0x91,r6,(r3) # eo$move 1 507 clrb (r3) # eo$end 508 editpc r6,(r1),48(r1),16(r1) # unpack 'em all 509 subl3 r6,r5,r1 # addr unpacked source 510 movl (sp),r3 # punctuated output placed here 511 clrl llafx 512 jlbc sign,f1 513 movb $'-,(r3)+ # negative 514 incl llafx 515 f1: movl exp,r0 516 jgtr f2 517 movb $'0,(r3)+ # must have digit before decimal point 518 jbr f3 519 f2: cmpl r0,r6 # limit on packed length 520 jleq f4 521 movl r6,r0 522 f4: subl2 r0,r6 # eat some digits 523 subl2 r0,exp # from the exponent 524 movc3 r0,(r1),(r3) # (most of the) digits to left of decimal point 525 movl exp,r0 # need any more? 526 jleq f3 527 movc5 $0,(r1),$'0,r0,(r3) # '0 fill 528 f3: movl ndigit,r0 # # digits to right of decimal point 529 jgtr f5 530 jbs $numsgn,flags,f5 # no decimal point unless forced 531 jbcs $dpflag,flags,f6 # no decimal point 532 f5: movb $'.,(r3)+ # the decimal point 533 f6: mnegl exp,r0 # "leading" zeroes to right of decimal point 534 jleq f9 535 cmpl r0,ndigit # cant exceed this many 536 jleq fa 537 movl ndigit,r0 538 fa: subl2 r0,ndigit 539 movc5 $0,(r1),$'0,r0,(r3) 540 f9: movl ndigit,r0 541 cmpl r0,r6 # limit on packed length 542 jleq f7 543 movl r6,r0 544 f7: subl2 r0,ndigit # eat some digits from the fraction 545 movc3 r0,(r1),(r3) # (most of the) digits to right of decimal point 546 movl ndigit,r0 # need any more? 547 jleq f8 548 # check bounds on users who say %.300f 549 movab 32(r3)[r0],r2 550 subl2 fp,r2 551 jlss fb 552 subl2 r2,r0 # truncate, willy-nilly 553 movl r0,ndigit # and no more digits later, either 554 fb: 555 # 556 subl2 r0,ndigit # eat some digits from the fraction 557 movc5 $0,(r1),$'0,r0,(r3) # '0 fill 558 f8: movl r3,r5 # addr last byte +1 559 popr $1<1 # [movl (sp)+,r1] addr first byte 560 rsb 561 562 patexp: .byte 0x03 # eo$set_signif 563 .byte 0x44,'e # eo$insert 'e 564 .byte 0x42,'+ # eo$load_plus '+ 565 .byte 0x04 # eo$store_sign 566 .byte 0x92 # eo$move 2 567 .byte 0 # eo$end 568 569 scien: 570 incl ndigit 571 jbs $prec,flags,L23 572 movl $7,ndigit 573 L23: bsbw fltcvt # get packed digits 574 movl ndigit,r7 575 cmpl r7,$31 # expressible in packed decimal? 576 jleq snarro # yes 577 movl $31,r7 578 snarro: subl3 $17,r7,r0 # rounding position 579 ashp r0,$17,(sp),$5,r7,16(sp) # shift and round 580 bvc snovfl 581 # band-aid for microcode error (spurious overflow) 582 # clrl r0 # assume even length result 583 # jlbc ndigit,sceven # right 584 # movl $4,r0 # odd length result 585 #sceven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow 586 # bneq snovfl 587 # end band-aid 588 incl exp # rounding overflowed to 100... 589 subl3 $1,r7,r0 590 ashp r0,$1,pone,$0,r7,16(sp) 591 ashl $-1,r7,r0 # displ to last byte 592 bisb2 sign,16(sp)[r0] # insert sign 593 snovfl: 594 jbs $gflag,flags,gfmt # %g format 595 movab 16(sp),r1 596 bsbb eedit 597 eexp: 598 movl r1,r6 # save fwa from destruction by cvtlp 599 subl3 $1,sexp,r0 # 1P exponent 600 cvtlp r0,$2,(sp) # packed 601 editpc $2,(sp),patexp,(r5) 602 movl r6,r1 # fwa 603 jbc $caps,flags,prnum 604 xorb2 $'e^'E,-4(r5) 605 jbr prnum 606 607 eedit: 608 movl r7,r6 # packed length 609 decl ndigit # 1 digit before decimal point 610 movl exp,sexp # save from destruction 611 movl $1,exp # and pretend 612 jbr fedit 613 614 gfmt: 615 addl3 $3,exp,r0 # exp is 1 more than e 616 jlss gfmte # (e+1)+3<0, e+4<=-1, e<=-5 617 subl2 $3,r0 # exp [==(e+1)] 618 cmpl r0,ndigit 619 jgtr gfmte # e+1>n, e>=n 620 gfmtf: 621 movl r7,r6 622 subl2 r0,ndigit # n-e-1 623 movab 16(sp),r1 624 bsbw fedit 625 g1: jbs $numsgn,flags,g2 626 jbs $dpflag,flags,g2 # dont strip if no decimal point 627 g3: cmpb -(r5),$'0 # strip trailing zeroes 628 jeql g3 629 cmpb (r5),$'. # and trailing decimal point 630 jeql g2 631 incl r5 632 g2: jbc $gflag,flags,eexp 633 jbr prnum 634 gfmte: 635 movab 16(sp),r1 # packed source 636 bsbw eedit 637 jbsc $gflag,flags,g1 # gflag now means "use %f" [hence no exponent] 638 639 general: 640 jbs $prec,flags,gn1 641 movl $6,ndigit # default precision is 6 significant digits 642 gn1: tstl ndigit # cannot allow precision of 0 643 jgtr gn2 644 movl $1,ndigit # change 0 to 1, willy-nilly 645 gn2: jbcs $gflag,flags,L23 646 jbr L23 # safety net 647 648 # convert double-floating at (ap) to 17-digit packed at (sp), 649 # set 'sign' and 'exp', advance ap. 650 fltcvt: 651 clrb sign 652 movd (ap)+,r5 653 jeql fzero 654 bgtr fpos 655 mnegd r5,r5 656 incb sign 657 fpos: 658 extzv $7,$8,r5,r2 # exponent of 2 659 movab -0200(r2),r2 # unbias 660 mull2 $59,r2 # 59/196: 3rd convergent continued frac of log10(2) 661 jlss eneg 662 movab 196(r2),r2 663 eneg: 664 movab -98(r2),r2 665 divl2 $196,r2 666 bsbw expten 667 cmpd r0,r5 668 bgtr ceil 669 incl r2 670 ceil: movl r2,exp 671 mnegl r2,r2 672 cmpl r2,$29 # 10^(29+9) is all we can handle 673 bleq getman 674 muld2 ten16,r5 675 subl2 $16,r2 676 getman: addl2 $9,r2 # -ceil(log10(x)) + 9 677 jsb expten 678 emodd r0,r4,r5,r0,r5 # (r0+r4)*r5; r0=int, r5=frac 679 fz1: cvtlp r0,$9,16(sp) # leading 9 digits 680 ashp $8,$9,16(sp),$0,$17,4(sp) # as top 9 of 17 681 emodd ten8,$0,r5,r0,r5 682 cvtlp r0,$8,16(sp) # trailing 8 digits 683 # if precision >= 17, must round here 684 movl ndigit,r7 # so figure out what precision is 685 pushab scien 686 cmpl (sp)+,(sp) 687 jleq gm1 # who called us? 688 addl2 exp,r7 # float; adjust for exponent 689 gm1: cmpl r7,$17 690 jlss gm2 691 cmpd r5,$0d0.5 # must round here; check fraction 692 jlss gm2 693 bisb2 $0x10,8+4(sp) # increment l.s. digit 694 gm2: # end of "round here" code 695 addp4 $8,16(sp),$17,4(sp) # combine leading and trailing 696 bisb2 sign,12(sp) # and insert sign 697 rsb 698 fzero: clrl r0 699 movl $1,exp # 0.000e+00 and 0.000 rather than 0.000e-01 and .000 700 jbr fz1 701 702 .align 2 703 lsb: .long 0x00010000 # lsb in the crazy floating-point format 704 705 # return 10^r2 as a double float in r0||r1 and 8 extra bits of precision in r4 706 # preserve r2, r5||r6 707 expten: 708 movd $0d1.0,r0 # begin computing 10^exp10 709 clrl r4 # bit counter 710 movad ten1,r3 # table address 711 tstl r2 712 bgeq e10lp 713 mnegl r2,r2 # get absolute value 714 jbss $6,r2,e10lp # flag as negative 715 e10lp: jbc r4,r2,el1 # want this power? 716 muld2 (r3),r0 # yes 717 el1: addl2 $8,r3 # advance to next power 718 aobleq $5,r4,e10lp # through 10^32 719 jbcc $6,r2,el2 # correct for negative exponent 720 divd3 r0,$0d1.0,r0 # by taking reciprocal 721 cmpl $28,r2 722 jneq enm28 723 addl2 lsb,r1 # 10**-28 needs lsb incremented 724 enm28: mnegl r2,r2 # original exponent of 10 725 el2: addl3 $5*8,r2,r3 # negative bit positions are illegal? 726 jbc r3,xlsbh-5,eoklsb 727 subl2 lsb,r1 # lsb was too high 728 eoklsb: 729 movzbl xprec[r2],r4 # 8 extra bits 730 rsb 731 732 # powers of ten 733 .align 2 734 ten1: .word 0x4220,0,0,0 735 ten2: .word 0x43c8,0,0,0 736 ten4: .word 0x471c,0x4000,0,0 737 ten8: .word 0x4dbe,0xbc20,0,0 738 ten16: .word 0x5b0e,0x1bc9,0xbf04,0 739 ten32: .word 0x759d,0xc5ad,0xa82b,0x70b6 740 741 # whether lsb is too high or not 742 .byte 1:0,1:0,1:0,1:0,1:1,1:0,1:1,1:0 # -40 thru -33 743 .byte 1:0,1:1,1:0,1:0,1:0,1:0,1:1,1:0 # -32 thru -25 744 .byte 1:0,1:0,1:1,1:1,1:1,1:1,1:0,1:0 # -24 thru -17 745 .byte 1:0,1:1,1:0,1:0,1:1,1:1,1:1,1:1 # -16 thru -9 746 .byte 1:1,1:1,1:1,1:0,1:0,1:0,1:0,1:1 # -8 thru -1 747 xlsbh: 748 .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 0 thru 7 749 .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 8 thru 15 750 .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 16 thru 23 751 .byte 1:0,1:1,1:1,1:0,1:1,1:1,1:1,1:1 # 24 thru 31 752 .byte 1:1,1:1,1:1,1:1,1:1,1:1,1:1 # 32 thru 38 753 754 # bytes of extra precision 755 .byte 0x56,0x76,0xd3,0x88,0xb5,0x62 # -38 thru -33 756 .byte 0xba,0xf5,0x32,0x3e,0x0e,0x48,0xdb,0x51 # -32 thru -25 757 .byte 0x53,0x27,0xb1,0xef,0xeb,0xa5,0x07,0x49 # -24 thru -17 758 .byte 0x5b,0xd9,0x0f,0x13,0xcd,0xff,0xbf,0x97 # -16 thru -9 759 .byte 0xfd,0xbc,0xb6,0x23,0x2c,0x3b,0x0a,0xcd # -8 thru -1 760 xprec: 761 .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 0 thru 7 762 .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 8 thru 15 763 .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 16 thru 23 764 .byte 0x00,0xa0,0xc8,0x3a,0x84,0xe4,0xdc,0x92 # 24 thru 31 765 .byte 0x9b,0x00,0xc0,0x58,0xae,0x18,0xef # 32 thru 38 766