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1.1 ! root 1: /* @(#)doprnt.s 4.4 (Berkeley) 11/25/81 */ ! 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: .align 1 ! 50: __doprnt: ! 51: .word 0xfc0 # uses r11-r6 ! 52: jbr doit ! 53: ! 54: strfoo: ! 55: clrl r4 # fix interrupt race ! 56: jbr strok # and try again ! 57: strmore: ! 58: movzbl (r1)+,r2 # one char ! 59: tstb strtab[r2] # translate ! 60: jeql stresc2 # bad guy in disguise (outbuf is full) ! 61: strout2: # enter here to force out r2; r0,r1 must be set ! 62: pushr $3 # save input descriptor ! 63: pushl fdesc # FILE ! 64: pushl r2 # the char ! 65: calls $2,__flsbuf # please empty the buffer and handle 1 char ! 66: tstl r0 # successful? ! 67: jgeq strm1 # yes ! 68: jbcs $31,nchar,strm1 # turn on sign bit of nchar to signify error ! 69: strm1: ! 70: incl nchar # count the char ! 71: popr $3 # get input descriptor back ! 72: strout: # enter via bsb with (r0,r1)=input descriptor ! 73: movab strtab,r3 # table address ! 74: movq *fdesc,r4 # output descriptor ! 75: jbs $31,r4,strfoo # negative count is a no no ! 76: strok: ! 77: addl2 r0,nchar # we intend to move this many chars ! 78: /******* Start bogus movtuc workaround *****/ ! 79: clrl r2 ! 80: tstl r0 ! 81: bleq movdon ! 82: movlp: ! 83: tstl r4 ! 84: bleq movdon ! 85: movzbl (r1)+,r3 ! 86: tstb strtab[r3] ! 87: bneq 1f ! 88: mnegl $1,r2 ! 89: decl r1 ! 90: brb movdon ! 91: 1: ! 92: movb r3,(r5)+ ! 93: decl r4 ! 94: sobgtr r0,movlp ! 95: /******* End bogus movtuc workaround *** ! 96: movtuc r0,(r1),$0,(r3),r4,(r5) ! 97: movpsl r2 /* squirrel away condition codes */ ! 98: /******* End equally bogus movtuc ****/ ! 99: movdon: movq r4,*fdesc /* update output descriptor */ ! 100: subl2 r0,nchar # some chars not moved ! 101: jbs $vbit,r2,stresc # terminated by escape? ! 102: sobgeq r0,strmore # no; but out buffer might be full ! 103: stresc: ! 104: rsb ! 105: stresc2: ! 106: incl r0 # fix the length ! 107: decl r1 # and the addr ! 108: movl $1<vbit,r2 # fake condition codes ! 109: rsb ! 110: ! 111: errdone: ! 112: jbcs $31,nchar,prdone # set error bit ! 113: prdone: ! 114: movl nchar,r0 ! 115: ret ! 116: ! 117: doit: ! 118: movab -256(sp),sp # work space ! 119: movl 4(ap),r11 # addr of format string ! 120: movl 12(ap),fdesc # output FILE ptr ! 121: movl 8(ap),ap # addr of first arg ! 122: clrl nchar # number of chars transferred ! 123: loop: ! 124: movzwl $65535,r0 # pseudo length ! 125: movl r11,r1 # fmt addr ! 126: # comet sucks. ! 127: movq *fdesc,r4 ! 128: subl3 r1,r5,r2 ! 129: jlss lp1 ! 130: cmpl r0,r2 ! 131: jleq lp1 ! 132: movl r2,r0 ! 133: lp1: ! 134: # ! 135: bsbw strout # copy to output, stop at null or percent ! 136: movl r1,r11 # new fmt ! 137: jbc $vbit,r2,loop # if no escape, then very long fmt ! 138: tstb (r11)+ # escape; null or percent? ! 139: jeql prdone # null means end of fmt ! 140: ! 141: movl sp,r5 # reset output buffer pointer ! 142: clrq r9 # width; flags ! 143: clrq r6 # lrafx,llafx ! 144: longorunsg: # we can ignore both of these distinctions ! 145: short: ! 146: L4a: ! 147: movzbl (r11)+,r0 # so capital letters can tail merge ! 148: L4: caseb r0,$' ,$'x-' # format char ! 149: L5: ! 150: .word space-L5 # space ! 151: .word fmtbad-L5 # ! ! 152: .word fmtbad-L5 # " ! 153: .word sharp-L5 # # ! 154: .word fmtbad-L5 # $ ! 155: .word fmtbad-L5 # % ! 156: .word fmtbad-L5 # & ! 157: .word fmtbad-L5 # ' ! 158: .word fmtbad-L5 # ( ! 159: .word fmtbad-L5 # ) ! 160: .word indir-L5 # * ! 161: .word plus-L5 # + ! 162: .word fmtbad-L5 # , ! 163: .word minus-L5 # - ! 164: .word dot-L5 # . ! 165: .word fmtbad-L5 # / ! 166: .word gnum0-L5 # 0 ! 167: .word gnum-L5 # 1 ! 168: .word gnum-L5 # 2 ! 169: .word gnum-L5 # 3 ! 170: .word gnum-L5 # 4 ! 171: .word gnum-L5 # 5 ! 172: .word gnum-L5 # 6 ! 173: .word gnum-L5 # 7 ! 174: .word gnum-L5 # 8 ! 175: .word gnum-L5 # 9 ! 176: .word fmtbad-L5 # : ! 177: .word fmtbad-L5 # ; ! 178: .word fmtbad-L5 # < ! 179: .word fmtbad-L5 # = ! 180: .word fmtbad-L5 # > ! 181: .word fmtbad-L5 # ? ! 182: .word fmtbad-L5 # @ ! 183: .word fmtbad-L5 # A ! 184: .word fmtbad-L5 # B ! 185: .word fmtbad-L5 # C ! 186: .word decimal-L5 # D ! 187: .word capital-L5 # E ! 188: .word fmtbad-L5 # F ! 189: .word capital-L5 # G ! 190: .word fmtbad-L5 # H ! 191: .word fmtbad-L5 # I ! 192: .word fmtbad-L5 # J ! 193: .word fmtbad-L5 # K ! 194: .word fmtbad-L5 # L ! 195: .word fmtbad-L5 # M ! 196: .word fmtbad-L5 # N ! 197: .word octal-L5 # O ! 198: .word fmtbad-L5 # P ! 199: .word fmtbad-L5 # Q ! 200: .word fmtbad-L5 # R ! 201: .word fmtbad-L5 # S ! 202: .word fmtbad-L5 # T ! 203: .word unsigned-L5 # U ! 204: .word fmtbad-L5 # V ! 205: .word fmtbad-L5 # W ! 206: .word hex-L5 # X ! 207: .word fmtbad-L5 # Y ! 208: .word fmtbad-L5 # Z ! 209: .word fmtbad-L5 # [ ! 210: .word fmtbad-L5 # \ ! 211: .word fmtbad-L5 # ] ! 212: .word fmtbad-L5 # ^ ! 213: .word fmtbad-L5 # _ ! 214: .word fmtbad-L5 # ` ! 215: .word fmtbad-L5 # a ! 216: .word fmtbad-L5 # b ! 217: .word charac-L5 # c ! 218: .word decimal-L5 # d ! 219: .word scien-L5 # e ! 220: .word float-L5 # f ! 221: .word general-L5 # g ! 222: .word short-L5 # h ! 223: .word fmtbad-L5 # i ! 224: .word fmtbad-L5 # j ! 225: .word fmtbad-L5 # k ! 226: .word longorunsg-L5 # l ! 227: .word fmtbad-L5 # m ! 228: .word fmtbad-L5 # n ! 229: .word octal-L5 # o ! 230: .word fmtbad-L5 # p ! 231: .word fmtbad-L5 # q ! 232: .word fmtbad-L5 # r ! 233: .word string-L5 # s ! 234: .word fmtbad-L5 # t ! 235: .word unsigned-L5 # u ! 236: .word fmtbad-L5 # v ! 237: .word fmtbad-L5 # w ! 238: .word hex-L5 # x ! 239: fmtbad: ! 240: movb r0,(r5)+ # print the unfound character ! 241: jeql errdone # dumb users who end the format with a % ! 242: jbr prbuf ! 243: capital: ! 244: bisl2 $1<caps,flags # note that it was capitalized ! 245: xorb2 $'a^'A,r0 # make it small ! 246: jbr L4 # and try again ! 247: ! 248: string: ! 249: movl ndigit,r0 ! 250: jbs $prec,flags,L20 # max length was specified ! 251: mnegl $1,r0 # default max length ! 252: L20: movl (ap)+,r2 # addr first byte ! 253: locc $0,r0,(r2) # find the zero at the end ! 254: movl r1,r5 # addr last byte +1 ! 255: movl r2,r1 # addr first byte ! 256: jbr prstr ! 257: ! 258: htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'a,'b,'c,'d,'e,'f ! 259: Htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'A,'B,'C,'D,'E,'F ! 260: ! 261: octal: ! 262: movl $30,r2 # init position ! 263: movl $3,r3 # field width ! 264: movab htab,llafx # translate table ! 265: jbr L10 ! 266: ! 267: hex: ! 268: movl $28,r2 # init position ! 269: movl $4,r3 # field width ! 270: movab htab,llafx # translate table ! 271: jbc $caps,flags,L10 ! 272: movab Htab,llafx ! 273: L10: mnegl r3,r6 # increment ! 274: clrl r1 ! 275: addl2 $4,r5 # room for left affix (2) and slop [forced sign?] ! 276: movl (ap)+,r0 # fetch arg ! 277: L11: extzv r2,r3,r0,r1 # pull out a digit ! 278: movb (llafx)[r1],(r5)+ # convert to character ! 279: L12: acbl $0,r6,r2,L11 # continue until done ! 280: clrq r6 # lrafx, llafx ! 281: clrb (r5) # flag end ! 282: skpc $'0,$11,4(sp) # skip over leading zeroes ! 283: jbc $numsgn,flags,prn3 # easy if no left affix ! 284: tstl -4(ap) # original value ! 285: jeql prn3 # no affix on 0, for some reason ! 286: cmpl r3,$4 # were we doing hex or octal? ! 287: jneq L12a # octal ! 288: movb $'x,r0 ! 289: jbc $caps,flags,L12b ! 290: movb $'X,r0 ! 291: L12b: movb r0,-(r1) ! 292: movl $2,llafx # leading 0x for hex is an affix ! 293: L12a: movb $'0,-(r1) # leading zero for octal is a digit, not an affix ! 294: jbr prn3 # omit sign (plus, blank) massaging ! 295: ! 296: unsigned: ! 297: lunsigned: ! 298: bicl2 $1<plssgn|1<blank,flags # omit sign (plus, blank) massaging ! 299: extzv $1,$31,(ap),r0 # right shift logical 1 bit ! 300: cvtlp r0,$10,(sp) # convert [n/2] to packed ! 301: movp $10,(sp),8(sp) # copy packed ! 302: addp4 $10,8(sp),$10,(sp) # 2*[n/2] in packed, at (sp) ! 303: blbc (ap)+,L14 # n was even ! 304: addp4 $1,pone,$10,(sp) # n was odd ! 305: jbr L14 ! 306: ! 307: patdec: # editpc pattern for decimal printing ! 308: .byte 0xAA # eo$float 10 ! 309: .byte 0x01 # eo$end_float ! 310: .byte 0 # eo$end ! 311: ! 312: decimal: ! 313: cvtlp (ap)+,$10,(sp) # 10 digits max ! 314: jgeq L14 ! 315: incl llafx # minus sign is a left affix ! 316: L14: editpc $10,(sp),patdec,8(sp) # ascii at 8(sp); r5=end+1 ! 317: skpc $' ,$11,8(sp) # skip leading blanks; r1=first ! 318: ! 319: prnum: # r1=addr first byte, r5=addr last byte +1, llafx=size of signs ! 320: # -1(r1) vacant, for forced sign ! 321: tstl llafx ! 322: jneq prn3 # already some left affix, dont fuss ! 323: jbc $plssgn,flags,prn2 ! 324: movb $'+,-(r1) # needs a plus sign ! 325: jbr prn4 ! 326: prn2: jbc $blank,flags,prn3 ! 327: movb $' ,-(r1) # needs a blank sign ! 328: prn4: incl llafx ! 329: prn3: jbs $prec,flags,prn1 ! 330: movl $1,ndigit # default precision is 1 ! 331: prn1: subl3 r1,r5,lrafx # raw width ! 332: subl2 llafx,lrafx # number of digits ! 333: subl2 lrafx,ndigit # number of leading zeroes needed ! 334: jleq prstr # none ! 335: addl2 llafx,r1 # where current digits start ! 336: pushl r1 # movcx gobbles registers ! 337: # check bounds on users who say %.300d ! 338: movab 32(r5)[ndigit],r2 ! 339: subl2 fp,r2 ! 340: jlss prn5 ! 341: subl2 r2,ndigit ! 342: prn5: ! 343: # ! 344: movc3 lrafx,(r1),(r1)[ndigit] # make room in middle ! 345: movc5 $0,(r1),$ch.zer,ndigit,*(sp) # '0 fill ! 346: subl3 llafx,(sp)+,r1 # first byte addr ! 347: addl3 lrafx,r3,r5 # last byte addr +1 ! 348: ! 349: prstr: # r1=addr first byte; r5=addr last byte +1 ! 350: # width=minimum width; llafx=len. left affix ! 351: # ndigit=<avail> ! 352: subl3 r1,r5,ndigit # raw width ! 353: subl3 ndigit,width,r0 # pad length ! 354: jleq padlno # in particular, no left padding ! 355: jbs $minsgn,flags,padlno ! 356: # extension for %0 flag causing left zero padding to field width ! 357: jbs $zfill,flags,padlz ! 358: # this bsbb needed even if %0 flag extension is removed ! 359: bsbb padb # blank pad on left ! 360: jbr padnlz ! 361: padlz: ! 362: movl llafx,r0 ! 363: jleq padnlx # left zero pad requires left affix first ! 364: subl2 r0,ndigit # part of total length will be transferred ! 365: subl2 r0,width # and will account for part of minimum width ! 366: bsbw strout # left affix ! 367: padnlx: ! 368: subl3 ndigit,width,r0 # pad length ! 369: bsbb padz # zero pad on left ! 370: padnlz: ! 371: # end of extension for left zero padding ! 372: padlno: # remaining: root, possible right padding ! 373: subl2 ndigit,width # root reduces minimum width ! 374: movl ndigit,r0 # root length ! 375: p1: bsbw strout # transfer to output buffer ! 376: p3: jbc $vbit,r2,padnpct # percent sign (or null byte via %c) ? ! 377: decl r0 # yes; adjust count ! 378: movzbl (r1)+,r2 # fetch byte ! 379: movq *fdesc,r4 # output buffer descriptor ! 380: sobgeq r4,p2 # room at the out [inn] ? ! 381: bsbw strout2 # no; force it, then try rest ! 382: jbr p3 # here we go 'round the mullberry bush, ... ! 383: p2: movb r2,(r5)+ # hand-deposit the percent or null ! 384: incl nchar # count it ! 385: movq r4,*fdesc # store output descriptor ! 386: jbr p1 # what an expensive hiccup! ! 387: padnpct: ! 388: movl width,r0 # size of pad ! 389: jleq loop ! 390: bsbb padb ! 391: jbr loop ! 392: ! 393: padz: ! 394: movb $'0,r2 ! 395: jbr pad ! 396: padb: ! 397: movb $' ,r2 ! 398: pad: ! 399: subl2 r0,width # pad width decreases minimum width ! 400: pushl r1 # save non-pad addr ! 401: movl r0,llafx # remember width of pad ! 402: subl2 r0,sp # allocate ! 403: movc5 $0,(r0),r2,llafx,(sp) # create pad string ! 404: movl llafx,r0 # length ! 405: movl sp,r1 # addr ! 406: bsbw strout ! 407: addl2 llafx,sp # deallocate ! 408: movl (sp)+,r1 # recover non-pad addr ! 409: rsb ! 410: ! 411: pone: .byte 0x1C # packed 1 ! 412: ! 413: charac: ! 414: movl (ap)+,r0 # word containing the char ! 415: movb r0,(r5)+ # one byte, that's all ! 416: ! 417: prbuf: ! 418: movl sp,r1 # addr first byte ! 419: jbr prstr ! 420: ! 421: space: bisl2 $1<blank,flags # constant width e fmt, no plus sign ! 422: jbr L4a ! 423: sharp: bisl2 $1<numsgn,flags # 'self identifying', please ! 424: jbr L4a ! 425: plus: bisl2 $1<plssgn,flags # always print sign for floats ! 426: jbr L4a ! 427: minus: bisl2 $1<minsgn,flags # left justification, please ! 428: jbr L4a ! 429: gnum0: jbs $ndfnd,flags,gnum ! 430: jbs $prec,flags,gnump # ignore when reading precision ! 431: bisl2 $1<zfill,flags # leading zero fill, please ! 432: gnum: jbs $prec,flags,gnump ! 433: moval (width)[width],width # width *= 5; ! 434: movaw -ch.zer(r0)[width],width # width = 2*witdh + r0 - '0'; ! 435: jbr gnumd ! 436: gnump: moval (ndigit)[ndigit],ndigit # ndigit *= 5; ! 437: movaw -ch.zer(r0)[ndigit],ndigit # ndigit = 2*ndigit + r0 - '0'; ! 438: gnumd: bisl2 $1<ndfnd,flags # digit seen ! 439: jbr L4a ! 440: dot: clrl ndigit # start on the precision ! 441: bisl2 $1<prec,flags ! 442: bicl2 $1<ndfnd,flags ! 443: jbr L4a ! 444: indir: ! 445: jbs $prec,flags,in1 ! 446: movl (ap)+,width # width specified by parameter ! 447: jgeq gnumd ! 448: xorl2 $1<minsgn,flags # parameterized left adjustment ! 449: mnegl width,width ! 450: jbr gnumd ! 451: in1: ! 452: movl (ap)+,ndigit # precision specified by paratmeter ! 453: jgeq gnumd ! 454: mnegl ndigit,ndigit ! 455: jbr gnumd ! 456: ! 457: float: ! 458: jbs $prec,flags,float1 ! 459: movl $6,ndigit # default # digits to right of decpt. ! 460: float1: bsbw fltcvt ! 461: addl3 exp,ndigit,r7 ! 462: movl r7,r6 # for later "underflow" checking ! 463: bgeq fxplrd ! 464: clrl r7 # poor programmer planning ! 465: fxplrd: cmpl r7,$31 # expressible in packed decimal? ! 466: bleq fnarro # yes ! 467: movl $31,r7 ! 468: fnarro: subl3 $17,r7,r0 # where to round ! 469: ashp r0,$17,(sp),$5,r7,16(sp) # do it ! 470: bvc fnovfl ! 471: # band-aid for microcode error (spurious overflow) ! 472: # clrl r0 # assume even length result ! 473: # jlbc r7,fleven # right ! 474: # movl $4,r0 # odd length result ! 475: #fleven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow ! 476: # bneq fnovfl ! 477: # end band-aid ! 478: aobleq $0,r6,fnovfl # if "underflow" then jump ! 479: movl r7,r0 ! 480: incl exp ! 481: incl r7 ! 482: ashp r0,$1,pone,$0,r7,16(sp) ! 483: ashl $-1,r7,r0 # displ to last byte ! 484: bisb2 sign,16(sp)[r0] # insert sign ! 485: fnovfl: ! 486: movab 16(sp),r1 # packed source ! 487: movl r7,r6 # packed length ! 488: pushab prnum # goto prnum after fall-through call to fedit ! 489: ! 490: ! 491: # enter via bsb ! 492: # r1=addr of packed source ! 493: # 16(r1) used to unpack source ! 494: # 48(r1) used to construct pattern to unpack source ! 495: # 48(r1) used to hold result ! 496: # r6=length of packed source (destroyed) ! 497: # exp=# digits to left of decimal point (destroyed) ! 498: # ndigit=# digits to right of decimal point (destroyed) ! 499: # sign=1 if negative, 0 otherwise ! 500: # stack will be used for work space for pattern and unpacked source ! 501: # exits with ! 502: # r1=addr of punctuated result ! 503: # r5=addr of last byte +1 ! 504: # llafx=1 if minus sign inserted, 0 otherwise ! 505: fedit: ! 506: pushab 48(r1) # save result addr ! 507: movab 48(r1),r3 # pattern addr ! 508: movb $0x03,(r3)+ # eo$set_signif ! 509: movc5 $0,(r1),$0x91,r6,(r3) # eo$move 1 ! 510: clrb (r3) # eo$end ! 511: editpc r6,(r1),48(r1),16(r1) # unpack 'em all ! 512: subl3 r6,r5,r1 # addr unpacked source ! 513: movl (sp),r3 # punctuated output placed here ! 514: clrl llafx ! 515: jlbc sign,f1 ! 516: movb $'-,(r3)+ # negative ! 517: incl llafx ! 518: f1: movl exp,r0 ! 519: jgtr f2 ! 520: movb $'0,(r3)+ # must have digit before decimal point ! 521: jbr f3 ! 522: f2: cmpl r0,r6 # limit on packed length ! 523: jleq f4 ! 524: movl r6,r0 ! 525: f4: subl2 r0,r6 # eat some digits ! 526: subl2 r0,exp # from the exponent ! 527: movc3 r0,(r1),(r3) # (most of the) digits to left of decimal point ! 528: movl exp,r0 # need any more? ! 529: jleq f3 ! 530: movc5 $0,(r1),$'0,r0,(r3) # '0 fill ! 531: f3: movl ndigit,r0 # # digits to right of decimal point ! 532: jgtr f5 ! 533: jbs $numsgn,flags,f5 # no decimal point unless forced ! 534: jbcs $dpflag,flags,f6 # no decimal point ! 535: f5: movb $'.,(r3)+ # the decimal point ! 536: f6: mnegl exp,r0 # "leading" zeroes to right of decimal point ! 537: jleq f9 ! 538: cmpl r0,ndigit # cant exceed this many ! 539: jleq fa ! 540: movl ndigit,r0 ! 541: fa: subl2 r0,ndigit ! 542: movc5 $0,(r1),$'0,r0,(r3) ! 543: f9: movl ndigit,r0 ! 544: cmpl r0,r6 # limit on packed length ! 545: jleq f7 ! 546: movl r6,r0 ! 547: f7: subl2 r0,ndigit # eat some digits from the fraction ! 548: movc3 r0,(r1),(r3) # (most of the) digits to right of decimal point ! 549: movl ndigit,r0 # need any more? ! 550: jleq f8 ! 551: # check bounds on users who say %.300f ! 552: movab 32(r3)[r0],r2 ! 553: subl2 fp,r2 ! 554: jlss fb ! 555: subl2 r2,r0 # truncate, willy-nilly ! 556: movl r0,ndigit # and no more digits later, either ! 557: fb: ! 558: # ! 559: subl2 r0,ndigit # eat some digits from the fraction ! 560: movc5 $0,(r1),$'0,r0,(r3) # '0 fill ! 561: f8: movl r3,r5 # addr last byte +1 ! 562: popr $1<1 # [movl (sp)+,r1] addr first byte ! 563: rsb ! 564: ! 565: patexp: .byte 0x03 # eo$set_signif ! 566: .byte 0x44,'e # eo$insert 'e ! 567: .byte 0x42,'+ # eo$load_plus '+ ! 568: .byte 0x04 # eo$store_sign ! 569: .byte 0x92 # eo$move 2 ! 570: .byte 0 # eo$end ! 571: ! 572: scien: ! 573: incl ndigit ! 574: jbs $prec,flags,L23 ! 575: movl $7,ndigit ! 576: L23: bsbw fltcvt # get packed digits ! 577: movl ndigit,r7 ! 578: cmpl r7,$31 # expressible in packed decimal? ! 579: jleq snarro # yes ! 580: movl $31,r7 ! 581: snarro: subl3 $17,r7,r0 # rounding position ! 582: ashp r0,$17,(sp),$5,r7,16(sp) # shift and round ! 583: bvc snovfl ! 584: # band-aid for microcode error (spurious overflow) ! 585: # clrl r0 # assume even length result ! 586: # jlbc ndigit,sceven # right ! 587: # movl $4,r0 # odd length result ! 588: #sceven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow ! 589: # bneq snovfl ! 590: # end band-aid ! 591: incl exp # rounding overflowed to 100... ! 592: subl3 $1,r7,r0 ! 593: ashp r0,$1,pone,$0,r7,16(sp) ! 594: ashl $-1,r7,r0 # displ to last byte ! 595: bisb2 sign,16(sp)[r0] # insert sign ! 596: snovfl: ! 597: jbs $gflag,flags,gfmt # %g format ! 598: movab 16(sp),r1 ! 599: bsbb eedit ! 600: eexp: ! 601: movl r1,r6 # save fwa from destruction by cvtlp ! 602: subl3 $1,sexp,r0 # 1P exponent ! 603: cvtlp r0,$2,(sp) # packed ! 604: editpc $2,(sp),patexp,(r5) ! 605: movl r6,r1 # fwa ! 606: jbc $caps,flags,prnum ! 607: xorb2 $'e^'E,-4(r5) ! 608: jbr prnum ! 609: ! 610: eedit: ! 611: movl r7,r6 # packed length ! 612: decl ndigit # 1 digit before decimal point ! 613: movl exp,sexp # save from destruction ! 614: movl $1,exp # and pretend ! 615: jbr fedit ! 616: ! 617: gfmt: ! 618: addl3 $3,exp,r0 # exp is 1 more than e ! 619: jlss gfmte # (e+1)+3<0, e+4<=-1, e<=-5 ! 620: subl2 $3,r0 # exp [==(e+1)] ! 621: cmpl r0,ndigit ! 622: jgtr gfmte # e+1>n, e>=n ! 623: gfmtf: ! 624: movl r7,r6 ! 625: subl2 r0,ndigit # n-e-1 ! 626: movab 16(sp),r1 ! 627: bsbw fedit ! 628: g1: jbs $numsgn,flags,g2 ! 629: jbs $dpflag,flags,g2 # dont strip if no decimal point ! 630: g3: cmpb -(r5),$'0 # strip trailing zeroes ! 631: jeql g3 ! 632: cmpb (r5),$'. # and trailing decimal point ! 633: jeql g2 ! 634: incl r5 ! 635: g2: jbc $gflag,flags,eexp ! 636: jbr prnum ! 637: gfmte: ! 638: movab 16(sp),r1 # packed source ! 639: bsbw eedit ! 640: jbsc $gflag,flags,g1 # gflag now means "use %f" [hence no exponent] ! 641: ! 642: general: ! 643: jbs $prec,flags,gn1 ! 644: movl $6,ndigit # default precision is 6 significant digits ! 645: gn1: tstl ndigit # cannot allow precision of 0 ! 646: jgtr gn2 ! 647: movl $1,ndigit # change 0 to 1, willy-nilly ! 648: gn2: jbcs $gflag,flags,L23 ! 649: jbr L23 # safety net ! 650: ! 651: # convert double-floating at (ap) to 17-digit packed at (sp), ! 652: # set 'sign' and 'exp', advance ap. ! 653: fltcvt: ! 654: clrb sign ! 655: movd (ap)+,r5 ! 656: jeql fzero ! 657: bgtr fpos ! 658: mnegd r5,r5 ! 659: incb sign ! 660: fpos: ! 661: extzv $7,$8,r5,r2 # exponent of 2 ! 662: movab -0200(r2),r2 # unbias ! 663: mull2 $59,r2 # 59/196: 3rd convergent continued frac of log10(2) ! 664: jlss eneg ! 665: movab 196(r2),r2 ! 666: eneg: ! 667: movab -98(r2),r2 ! 668: divl2 $196,r2 ! 669: bsbw expten ! 670: cmpd r0,r5 ! 671: bgtr ceil ! 672: incl r2 ! 673: ceil: movl r2,exp ! 674: mnegl r2,r2 ! 675: cmpl r2,$29 # 10^(29+9) is all we can handle ! 676: bleq getman ! 677: muld2 ten16,r5 ! 678: subl2 $16,r2 ! 679: getman: addl2 $9,r2 # -ceil(log10(x)) + 9 ! 680: jsb expten ! 681: emodd r0,r4,r5,r0,r5 # (r0+r4)*r5; r0=int, r5=frac ! 682: fz1: cvtlp r0,$9,16(sp) # leading 9 digits ! 683: ashp $8,$9,16(sp),$0,$17,4(sp) # as top 9 of 17 ! 684: emodd ten8,$0,r5,r0,r5 ! 685: cvtlp r0,$8,16(sp) # trailing 8 digits ! 686: # if precision >= 17, must round here ! 687: movl ndigit,r7 # so figure out what precision is ! 688: pushab scien ! 689: cmpl (sp)+,(sp) ! 690: jleq gm1 # who called us? ! 691: addl2 exp,r7 # float; adjust for exponent ! 692: gm1: cmpl r7,$17 ! 693: jlss gm2 ! 694: cmpd r5,$0d0.5 # must round here; check fraction ! 695: jlss gm2 ! 696: bisb2 $0x10,8+4(sp) # increment l.s. digit ! 697: gm2: # end of "round here" code ! 698: addp4 $8,16(sp),$17,4(sp) # combine leading and trailing ! 699: bisb2 sign,12(sp) # and insert sign ! 700: rsb ! 701: fzero: clrl r0 ! 702: movl $1,exp # 0.000e+00 and 0.000 rather than 0.000e-01 and .000 ! 703: jbr fz1 ! 704: ! 705: .align 2 ! 706: lsb: .long 0x00010000 # lsb in the crazy floating-point format ! 707: ! 708: # return 10^r2 as a double float in r0||r1 and 8 extra bits of precision in r4 ! 709: # preserve r2, r5||r6 ! 710: expten: ! 711: movd $0d1.0,r0 # begin computing 10^exp10 ! 712: clrl r4 # bit counter ! 713: movad ten1,r3 # table address ! 714: tstl r2 ! 715: bgeq e10lp ! 716: mnegl r2,r2 # get absolute value ! 717: jbss $6,r2,e10lp # flag as negative ! 718: e10lp: jbc r4,r2,el1 # want this power? ! 719: muld2 (r3),r0 # yes ! 720: el1: addl2 $8,r3 # advance to next power ! 721: aobleq $5,r4,e10lp # through 10^32 ! 722: jbcc $6,r2,el2 # correct for negative exponent ! 723: divd3 r0,$0d1.0,r0 # by taking reciprocal ! 724: cmpl $28,r2 ! 725: jneq enm28 ! 726: addl2 lsb,r1 # 10**-28 needs lsb incremented ! 727: enm28: mnegl r2,r2 # original exponent of 10 ! 728: el2: addl3 $5*8,r2,r3 # negative bit positions are illegal? ! 729: jbc r3,xlsbh-5,eoklsb ! 730: subl2 lsb,r1 # lsb was too high ! 731: eoklsb: ! 732: movzbl xprec[r2],r4 # 8 extra bits ! 733: rsb ! 734: ! 735: # powers of ten ! 736: .align 2 ! 737: ten1: .word 0x4220,0,0,0 ! 738: ten2: .word 0x43c8,0,0,0 ! 739: ten4: .word 0x471c,0x4000,0,0 ! 740: ten8: .word 0x4dbe,0xbc20,0,0 ! 741: ten16: .word 0x5b0e,0x1bc9,0xbf04,0 ! 742: ten32: .word 0x759d,0xc5ad,0xa82b,0x70b6 ! 743: ! 744: # whether lsb is too high or not ! 745: .byte 1:0,1:0,1:0,1:0,1:1,1:0,1:1,1:0 # -40 thru -33 ! 746: .byte 1:0,1:1,1:0,1:0,1:0,1:0,1:1,1:0 # -32 thru -25 ! 747: .byte 1:0,1:0,1:1,1:1,1:1,1:1,1:0,1:0 # -24 thru -17 ! 748: .byte 1:0,1:1,1:0,1:0,1:1,1:1,1:1,1:1 # -16 thru -9 ! 749: .byte 1:1,1:1,1:1,1:0,1:0,1:0,1:0,1:1 # -8 thru -1 ! 750: xlsbh: ! 751: .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 0 thru 7 ! 752: .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 8 thru 15 ! 753: .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 16 thru 23 ! 754: .byte 1:0,1:1,1:1,1:0,1:1,1:1,1:1,1:1 # 24 thru 31 ! 755: .byte 1:1,1:1,1:1,1:1,1:1,1:1,1:1 # 32 thru 38 ! 756: ! 757: # bytes of extra precision ! 758: .byte 0x56,0x76,0xd3,0x88,0xb5,0x62 # -38 thru -33 ! 759: .byte 0xba,0xf5,0x32,0x3e,0x0e,0x48,0xdb,0x51 # -32 thru -25 ! 760: .byte 0x53,0x27,0xb1,0xef,0xeb,0xa5,0x07,0x49 # -24 thru -17 ! 761: .byte 0x5b,0xd9,0x0f,0x13,0xcd,0xff,0xbf,0x97 # -16 thru -9 ! 762: .byte 0xfd,0xbc,0xb6,0x23,0x2c,0x3b,0x0a,0xcd # -8 thru -1 ! 763: xprec: ! 764: .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 0 thru 7 ! 765: .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 8 thru 15 ! 766: .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 16 thru 23 ! 767: .byte 0x00,0xa0,0xc8,0x3a,0x84,0xe4,0xdc,0x92 # 24 thru 31 ! 768: .byte 0x9b,0x00,0xc0,0x58,0xae,0x18,0xef # 32 thru 38
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