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1.1 ! root 1: /* @(#)doprnt.s 4.3 (Berkeley) 3/22/81 */ ! 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 capital-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
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