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1.1 ! root 1: #ifdef LIBC_SCCS ! 2: .data ! 3: _sccsid: ! 4: .asciz "@(#)doprnt.c 5.4 (Berkeley) 3/9/86" ! 5: .text ! 6: #endif LIBC_SCCS ! 7: ! 8: # C library -- conversions ! 9: ! 10: #include "DEFS.h" ! 11: ! 12: .globl __doprnt ! 13: .globl __flsbuf ! 14: ! 15: #define vbit 1 ! 16: #define flags r10 ! 17: #define ndfnd 0 ! 18: #define prec 1 ! 19: #define zfill 2 ! 20: #define minsgn 3 ! 21: #define plssgn 4 ! 22: #define numsgn 5 ! 23: #define caps 6 ! 24: #define blank 7 ! 25: #define gflag 8 ! 26: #define dpflag 9 ! 27: #define width r9 ! 28: #define ndigit r8 ! 29: #define llafx r7 ! 30: #define lrafx r6 ! 31: #define fdesc -4(fp) ! 32: #define exp -8(fp) ! 33: #define sexp -12(fp) ! 34: #define nchar -16(fp) ! 35: #define sign -17(fp) ! 36: .set ch.zer,'0 # cpp doesn't like single appostrophes ! 37: ! 38: .align 2 ! 39: strtab: # translate table for detecting null and percent ! 40: .byte 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 ! 41: .byte 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 ! 42: .byte ' ,'!,'",'#,'$, 0,'&,'','(,'),'*,'+,',,'-,'.,'/ ! 43: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,':,';,'<,'=,'>,'? ! 44: .byte '@,'A,'B,'C,'D,'E,'F,'G,'H,'I,'J,'K,'L,'M,'N,'O ! 45: .byte 'P,'Q,'R,'S,'T,'U,'V,'W,'X,'Y,'Z,'[,'\,'],'^,'_ ! 46: .byte '`,'a,'b,'c,'d,'e,'f,'g,'h,'i,'j,'k,'l,'m,'n,'o ! 47: .byte 'p,'q,'r,'s,'t,'u,'v,'w,'x,'y,'z,'{,'|,'},'~,127 ! 48: .byte 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143 ! 49: .byte 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159 ! 50: .byte 160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175 ! 51: .byte 176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191 ! 52: .byte 192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207 ! 53: .byte 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223 ! 54: .byte 224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239 ! 55: .byte 240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255 ! 56: ! 57: ENTRY(_doprnt, R6|R7|R8|R9|R10|R11) ! 58: jbr doit ! 59: ! 60: strfoo: ! 61: clrl r4 # fix interrupt race ! 62: jbr strok # and try again ! 63: strout2: # enter here to force out r2; r0,r1 must be set ! 64: # do some tricks with line buffering (_IOLBF) first ! 65: movl fdesc,r3 ! 66: jbc $7,16(r3),0f # not line buffered (unbuffered) ! 67: addl3 12(r3),8(r3),r4 # fdesc->_base+fdesc->_bufsiz ! 68: cmpl 4(r3),r4 # buffer full? ! 69: jgeq 0f # yes ! 70: cmpl r2,$10 # c == '\n'? ! 71: jeql 0f # yes ! 72: movb r2,*4(r3) # line buffered and not buffer full ! 73: incl 4(r3) # and not newline ! 74: clrl (r3) # just stuff it and fix _cnt ! 75: incl nchar # count the char ! 76: jbr strout # skip __flsbuf ! 77: 0: pushr $3 # save input descriptor ! 78: pushl fdesc # FILE ! 79: pushl r2 # the char ! 80: calls $2,__flsbuf # please empty the buffer and handle 1 char ! 81: tstl r0 # successful? ! 82: jgeq strm1 # yes ! 83: jbcs $31,nchar,strm1 # turn on sign bit of nchar to signify error ! 84: strm1: ! 85: incl nchar # count the char ! 86: popr $3 # get input descriptor back ! 87: strout: # enter via bsb with (r0,r1)=input descriptor ! 88: movab strtab,r3 # table address ! 89: movq *fdesc,r4 # output descriptor ! 90: jbs $31,r4,strfoo # negative count is a no no ! 91: strok: ! 92: addl2 r0,nchar # we intend to move this many chars ! 93: /******* Start bogus movtuc workaround *****/ ! 94: clrl r2 ! 95: tstl r0 ! 96: bleq movdon ! 97: movlp: ! 98: tstl r4 ! 99: bleq movdon ! 100: movzbl (r1)+,r3 ! 101: tstb strtab[r3] ! 102: bneq 1f ! 103: mnegl $1,r2 ! 104: decl r1 ! 105: brb movdon ! 106: 1: ! 107: movb r3,(r5)+ ! 108: decl r4 ! 109: sobgtr r0,movlp ! 110: /******* End bogus movtuc workaround *** ! 111: movtuc r0,(r1),$0,(r3),r4,(r5) ! 112: movpsl r2 /* squirrel away condition codes */ ! 113: /******* End equally bogus movtuc ****/ ! 114: movdon: movq r4,*fdesc /* update output descriptor */ ! 115: subl2 r0,nchar # some chars not moved ! 116: jbs $vbit,r2,stresc # terminated by escape? ! 117: sobgeq r0,strmore # no; but out buffer might be full ! 118: stresc: ! 119: rsb ! 120: strmore: ! 121: movzbl (r1)+,r2 # one char ! 122: tstb strtab[r2] # translate ! 123: jneq strout2 # bad guy in disguise (outbuf is full) ! 124: incl r0 # fix the length ! 125: decl r1 # and the addr ! 126: movl $1<vbit,r2 # fake condition codes ! 127: rsb ! 128: ! 129: errdone: ! 130: jbcs $31,nchar,prdone # set error bit ! 131: prdone: ! 132: movl nchar,r0 ! 133: ret ! 134: ! 135: doit: ! 136: movab -256(sp),sp # work space ! 137: movl 4(ap),r11 # addr of format string ! 138: movl 12(ap),fdesc # output FILE ptr ! 139: movl 8(ap),ap # addr of first arg ! 140: clrl nchar # number of chars transferred ! 141: loop: ! 142: movzwl $65535,r0 # pseudo length ! 143: movl r11,r1 # fmt addr ! 144: # comet sucks. ! 145: movq *fdesc,r4 ! 146: subl3 r1,r5,r2 ! 147: jlss lp1 ! 148: cmpl r0,r2 ! 149: jleq lp1 ! 150: movl r2,r0 ! 151: lp1: ! 152: # ! 153: bsbw strout # copy to output, stop at null or percent ! 154: movl r1,r11 # new fmt ! 155: jbc $vbit,r2,loop # if no escape, then very long fmt ! 156: tstb (r11)+ # escape; null or percent? ! 157: jeql prdone # null means end of fmt ! 158: ! 159: movl sp,r5 # reset output buffer pointer ! 160: clrq r9 # width; flags ! 161: clrq r6 # lrafx,llafx ! 162: longorunsg: # we can ignore both of these distinctions ! 163: short: ! 164: L4a: ! 165: movzbl (r11)+,r0 # so capital letters can tail merge ! 166: L4: caseb r0,$' ,$'x-' # format char ! 167: L5: ! 168: .word space-L5 # space ! 169: .word fmtbad-L5 # ! ! 170: .word fmtbad-L5 # " ! 171: .word sharp-L5 # # ! 172: .word fmtbad-L5 # $ ! 173: .word fmtbad-L5 # % ! 174: .word fmtbad-L5 # & ! 175: .word fmtbad-L5 # ' ! 176: .word fmtbad-L5 # ( ! 177: .word fmtbad-L5 # ) ! 178: .word indir-L5 # * ! 179: .word plus-L5 # + ! 180: .word fmtbad-L5 # , ! 181: .word minus-L5 # - ! 182: .word dot-L5 # . ! 183: .word fmtbad-L5 # / ! 184: .word gnum0-L5 # 0 ! 185: .word gnum-L5 # 1 ! 186: .word gnum-L5 # 2 ! 187: .word gnum-L5 # 3 ! 188: .word gnum-L5 # 4 ! 189: .word gnum-L5 # 5 ! 190: .word gnum-L5 # 6 ! 191: .word gnum-L5 # 7 ! 192: .word gnum-L5 # 8 ! 193: .word gnum-L5 # 9 ! 194: .word fmtbad-L5 # : ! 195: .word fmtbad-L5 # ; ! 196: .word fmtbad-L5 # < ! 197: .word fmtbad-L5 # = ! 198: .word fmtbad-L5 # > ! 199: .word fmtbad-L5 # ? ! 200: .word fmtbad-L5 # @ ! 201: .word fmtbad-L5 # A ! 202: .word fmtbad-L5 # B ! 203: .word fmtbad-L5 # C ! 204: .word decimal-L5 # D ! 205: .word capital-L5 # E ! 206: .word fmtbad-L5 # F ! 207: .word capital-L5 # G ! 208: .word fmtbad-L5 # H ! 209: .word fmtbad-L5 # I ! 210: .word fmtbad-L5 # J ! 211: .word fmtbad-L5 # K ! 212: .word fmtbad-L5 # L ! 213: .word fmtbad-L5 # M ! 214: .word fmtbad-L5 # N ! 215: .word octal-L5 # O ! 216: .word fmtbad-L5 # P ! 217: .word fmtbad-L5 # Q ! 218: .word fmtbad-L5 # R ! 219: .word fmtbad-L5 # S ! 220: .word fmtbad-L5 # T ! 221: .word unsigned-L5 # U ! 222: .word fmtbad-L5 # V ! 223: .word fmtbad-L5 # W ! 224: .word capital-L5 # X ! 225: .word fmtbad-L5 # Y ! 226: .word fmtbad-L5 # Z ! 227: .word fmtbad-L5 # [ ! 228: .word fmtbad-L5 # \ ! 229: .word fmtbad-L5 # ] ! 230: .word fmtbad-L5 # ^ ! 231: .word fmtbad-L5 # _ ! 232: .word fmtbad-L5 # ` ! 233: .word fmtbad-L5 # a ! 234: .word fmtbad-L5 # b ! 235: .word charac-L5 # c ! 236: .word decimal-L5 # d ! 237: .word scien-L5 # e ! 238: .word float-L5 # f ! 239: .word general-L5 # g ! 240: .word short-L5 # h ! 241: .word fmtbad-L5 # i ! 242: .word fmtbad-L5 # j ! 243: .word fmtbad-L5 # k ! 244: .word longorunsg-L5 # l ! 245: .word fmtbad-L5 # m ! 246: .word fmtbad-L5 # n ! 247: .word octal-L5 # o ! 248: .word fmtbad-L5 # p ! 249: .word fmtbad-L5 # q ! 250: .word fmtbad-L5 # r ! 251: .word string-L5 # s ! 252: .word fmtbad-L5 # t ! 253: .word unsigned-L5 # u ! 254: .word fmtbad-L5 # v ! 255: .word fmtbad-L5 # w ! 256: .word hex-L5 # x ! 257: fmtbad: ! 258: movb r0,(r5)+ # print the unfound character ! 259: jeql errdone # dumb users who end the format with a % ! 260: jbr prbuf ! 261: capital: ! 262: bisl2 $1<caps,flags # note that it was capitalized ! 263: xorb2 $'a^'A,r0 # make it small ! 264: jbr L4 # and try again ! 265: ! 266: string: ! 267: movl ndigit,r0 ! 268: jbs $prec,flags,L20 # max length was specified ! 269: mnegl $1,r0 # default max length ! 270: L20: movl (ap)+,r2 # addr first byte ! 271: locc $0,r0,(r2) # find the zero at the end ! 272: movl r1,r5 # addr last byte +1 ! 273: movl r2,r1 # addr first byte ! 274: jbr prstr ! 275: ! 276: htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'a,'b,'c,'d,'e,'f ! 277: Htab: .byte '0,'1,'2,'3,'4,'5,'6,'7,'8,'9,'A,'B,'C,'D,'E,'F ! 278: ! 279: octal: ! 280: movl $30,r2 # init position ! 281: movl $3,r3 # field width ! 282: movab htab,llafx # translate table ! 283: jbr L10 ! 284: ! 285: hex: ! 286: movl $28,r2 # init position ! 287: movl $4,r3 # field width ! 288: movab htab,llafx # translate table ! 289: jbc $caps,flags,L10 ! 290: movab Htab,llafx ! 291: L10: mnegl r3,r6 # increment ! 292: clrl r1 ! 293: addl2 $4,r5 # room for left affix (2) and slop [forced sign?] ! 294: movl (ap)+,r0 # fetch arg ! 295: L11: extzv r2,r3,r0,r1 # pull out a digit ! 296: movb (llafx)[r1],(r5)+ # convert to character ! 297: L12: acbl $0,r6,r2,L11 # continue until done ! 298: clrq r6 # lrafx, llafx ! 299: clrb (r5) # flag end ! 300: skpc $'0,$11,4(sp) # skip over leading zeroes ! 301: jbc $numsgn,flags,prn3 # easy if no left affix ! 302: tstl -4(ap) # original value ! 303: jeql prn3 # no affix on 0, for some reason ! 304: cmpl r3,$4 # were we doing hex or octal? ! 305: jneq L12a # octal ! 306: movb $'x,r0 ! 307: jbc $caps,flags,L12b ! 308: movb $'X,r0 ! 309: L12b: movb r0,-(r1) ! 310: movl $2,llafx # leading 0x for hex is an affix ! 311: L12a: movb $'0,-(r1) # leading zero for octal is a digit, not an affix ! 312: jbr prn3 # omit sign (plus, blank) massaging ! 313: ! 314: unsigned: ! 315: lunsigned: ! 316: bicl2 $1<plssgn|1<blank,flags # omit sign (plus, blank) massaging ! 317: extzv $1,$31,(ap),r0 # right shift logical 1 bit ! 318: cvtlp r0,$10,(sp) # convert [n/2] to packed ! 319: movp $10,(sp),8(sp) # copy packed ! 320: addp4 $10,8(sp),$10,(sp) # 2*[n/2] in packed, at (sp) ! 321: blbc (ap)+,L14 # n was even ! 322: addp4 $1,pone,$10,(sp) # n was odd ! 323: jbr L14 ! 324: ! 325: patdec: # editpc pattern for decimal printing ! 326: .byte 0xAA # eo$float 10 ! 327: .byte 0x01 # eo$end_float ! 328: .byte 0 # eo$end ! 329: ! 330: decimal: ! 331: cvtlp (ap)+,$10,(sp) # 10 digits max ! 332: jgeq L14 ! 333: incl llafx # minus sign is a left affix ! 334: L14: editpc $10,(sp),patdec,8(sp) # ascii at 8(sp); r5=end+1 ! 335: skpc $' ,$11,8(sp) # skip leading blanks; r1=first ! 336: ! 337: prnum: # r1=addr first byte, r5=addr last byte +1, llafx=size of signs ! 338: # -1(r1) vacant, for forced sign ! 339: tstl llafx ! 340: jneq prn3 # already some left affix, dont fuss ! 341: jbc $plssgn,flags,prn2 ! 342: movb $'+,-(r1) # needs a plus sign ! 343: jbr prn4 ! 344: prn2: jbc $blank,flags,prn3 ! 345: movb $' ,-(r1) # needs a blank sign ! 346: prn4: incl llafx ! 347: prn3: jbs $prec,flags,prn1 ! 348: movl $1,ndigit # default precision is 1 ! 349: prn1: subl3 r1,r5,lrafx # raw width ! 350: subl2 llafx,lrafx # number of digits ! 351: subl2 lrafx,ndigit # number of leading zeroes needed ! 352: jleq prstr # none ! 353: addl2 llafx,r1 # where current digits start ! 354: pushl r1 # movcx gobbles registers ! 355: # check bounds on users who say %.300d ! 356: movab 32(r5)[ndigit],r2 ! 357: subl2 fp,r2 ! 358: jlss prn5 ! 359: subl2 r2,ndigit ! 360: prn5: ! 361: # ! 362: movc3 lrafx,(r1),(r1)[ndigit] # make room in middle ! 363: movc5 $0,(r1),$ch.zer,ndigit,*(sp) # '0 fill ! 364: subl3 llafx,(sp)+,r1 # first byte addr ! 365: addl3 lrafx,r3,r5 # last byte addr +1 ! 366: ! 367: prstr: # r1=addr first byte; r5=addr last byte +1 ! 368: # width=minimum width; llafx=len. left affix ! 369: # ndigit=<avail> ! 370: subl3 r1,r5,ndigit # raw width ! 371: subl3 ndigit,width,r0 # pad length ! 372: jleq padlno # in particular, no left padding ! 373: jbs $minsgn,flags,padlno ! 374: # extension for %0 flag causing left zero padding to field width ! 375: jbs $zfill,flags,padlz ! 376: # this bsbb needed even if %0 flag extension is removed ! 377: bsbb padb # blank pad on left ! 378: jbr padnlz ! 379: padlz: ! 380: movl llafx,r0 ! 381: jleq padnlx # left zero pad requires left affix first ! 382: subl2 r0,ndigit # part of total length will be transferred ! 383: subl2 r0,width # and will account for part of minimum width ! 384: bsbw strout # left affix ! 385: padnlx: ! 386: subl3 ndigit,width,r0 # pad length ! 387: bsbb padz # zero pad on left ! 388: padnlz: ! 389: # end of extension for left zero padding ! 390: padlno: # remaining: root, possible right padding ! 391: subl2 ndigit,width # root reduces minimum width ! 392: movl ndigit,r0 # root length ! 393: p1: bsbw strout # transfer to output buffer ! 394: p3: jbc $vbit,r2,padnpct # percent sign (or null byte via %c) ? ! 395: decl r0 # yes; adjust count ! 396: movzbl (r1)+,r2 # fetch byte ! 397: movq *fdesc,r4 # output buffer descriptor ! 398: sobgeq r4,p2 # room at the out [inn] ? ! 399: bsbw strout2 # no; force it, then try rest ! 400: jbr p3 # here we go 'round the mullberry bush, ... ! 401: p2: movb r2,(r5)+ # hand-deposit the percent or null ! 402: incl nchar # count it ! 403: movq r4,*fdesc # store output descriptor ! 404: jbr p1 # what an expensive hiccup! ! 405: padnpct: ! 406: movl width,r0 # size of pad ! 407: jleq loop ! 408: bsbb padb ! 409: jbr loop ! 410: ! 411: padz: ! 412: movb $'0,r2 ! 413: jbr pad ! 414: padb: ! 415: movb $' ,r2 ! 416: pad: ! 417: subl2 r0,width # pad width decreases minimum width ! 418: pushl r1 # save non-pad addr ! 419: movl r0,llafx # remember width of pad ! 420: subl2 r0,sp # allocate ! 421: movc5 $0,(r0),r2,llafx,(sp) # create pad string ! 422: movl llafx,r0 # length ! 423: movl sp,r1 # addr ! 424: bsbw strout ! 425: addl2 llafx,sp # deallocate ! 426: movl (sp)+,r1 # recover non-pad addr ! 427: rsb ! 428: ! 429: pone: .byte 0x1C # packed 1 ! 430: ! 431: charac: ! 432: movl (ap)+,r0 # word containing the char ! 433: movb r0,(r5)+ # one byte, that's all ! 434: ! 435: prbuf: ! 436: movl sp,r1 # addr first byte ! 437: jbr prstr ! 438: ! 439: space: bisl2 $1<blank,flags # constant width e fmt, no plus sign ! 440: jbr L4a ! 441: sharp: bisl2 $1<numsgn,flags # 'self identifying', please ! 442: jbr L4a ! 443: plus: bisl2 $1<plssgn,flags # always print sign for floats ! 444: jbr L4a ! 445: minus: bisl2 $1<minsgn,flags # left justification, please ! 446: jbr L4a ! 447: gnum0: jbs $ndfnd,flags,gnum ! 448: jbs $prec,flags,gnump # ignore when reading precision ! 449: bisl2 $1<zfill,flags # leading zero fill, please ! 450: gnum: jbs $prec,flags,gnump ! 451: moval (width)[width],width # width *= 5; ! 452: movaw -ch.zer(r0)[width],width # width = 2*witdh + r0 - '0'; ! 453: jbr gnumd ! 454: gnump: moval (ndigit)[ndigit],ndigit # ndigit *= 5; ! 455: movaw -ch.zer(r0)[ndigit],ndigit # ndigit = 2*ndigit + r0 - '0'; ! 456: gnumd: bisl2 $1<ndfnd,flags # digit seen ! 457: jbr L4a ! 458: dot: clrl ndigit # start on the precision ! 459: bisl2 $1<prec,flags ! 460: bicl2 $1<ndfnd,flags ! 461: jbr L4a ! 462: indir: ! 463: jbs $prec,flags,in1 ! 464: movl (ap)+,width # width specified by parameter ! 465: jgeq gnumd ! 466: xorl2 $1<minsgn,flags # parameterized left adjustment ! 467: mnegl width,width ! 468: jbr gnumd ! 469: in1: ! 470: movl (ap)+,ndigit # precision specified by paratmeter ! 471: jgeq gnumd ! 472: mnegl ndigit,ndigit ! 473: jbr gnumd ! 474: ! 475: float: ! 476: jbs $prec,flags,float1 ! 477: movl $6,ndigit # default # digits to right of decpt. ! 478: float1: bsbw fltcvt ! 479: addl3 exp,ndigit,r7 ! 480: movl r7,r6 # for later "underflow" checking ! 481: bgeq fxplrd ! 482: clrl r7 # poor programmer planning ! 483: fxplrd: cmpl r7,$31 # expressible in packed decimal? ! 484: bleq fnarro # yes ! 485: movl $31,r7 ! 486: fnarro: subl3 $17,r7,r0 # where to round ! 487: ashp r0,$17,(sp),$5,r7,16(sp) # do it ! 488: bvc fnovfl ! 489: # band-aid for microcode error (spurious overflow) ! 490: # clrl r0 # assume even length result ! 491: # jlbc r7,fleven # right ! 492: # movl $4,r0 # odd length result ! 493: #fleven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow ! 494: # bneq fnovfl ! 495: # end band-aid ! 496: aobleq $0,r6,fnovfl # if "underflow" then jump ! 497: movl r7,r0 ! 498: incl exp ! 499: incl r7 ! 500: ashp r0,$1,pone,$0,r7,16(sp) ! 501: ashl $-1,r7,r0 # displ to last byte ! 502: bisb2 sign,16(sp)[r0] # insert sign ! 503: fnovfl: ! 504: movab 16(sp),r1 # packed source ! 505: movl r7,r6 # packed length ! 506: pushab prnum # goto prnum after fall-through call to fedit ! 507: ! 508: ! 509: # enter via bsb ! 510: # r1=addr of packed source ! 511: # 16(r1) used to unpack source ! 512: # 48(r1) used to construct pattern to unpack source ! 513: # 48(r1) used to hold result ! 514: # r6=length of packed source (destroyed) ! 515: # exp=# digits to left of decimal point (destroyed) ! 516: # ndigit=# digits to right of decimal point (destroyed) ! 517: # sign=1 if negative, 0 otherwise ! 518: # stack will be used for work space for pattern and unpacked source ! 519: # exits with ! 520: # r1=addr of punctuated result ! 521: # r5=addr of last byte +1 ! 522: # llafx=1 if minus sign inserted, 0 otherwise ! 523: fedit: ! 524: pushab 48(r1) # save result addr ! 525: movab 48(r1),r3 # pattern addr ! 526: movb $0x03,(r3)+ # eo$set_signif ! 527: movc5 $0,(r1),$0x91,r6,(r3) # eo$move 1 ! 528: clrb (r3) # eo$end ! 529: editpc r6,(r1),48(r1),16(r1) # unpack 'em all ! 530: subl3 r6,r5,r1 # addr unpacked source ! 531: movl (sp),r3 # punctuated output placed here ! 532: clrl llafx ! 533: jlbc sign,f1 ! 534: movb $'-,(r3)+ # negative ! 535: incl llafx ! 536: f1: movl exp,r0 ! 537: jgtr f2 ! 538: movb $'0,(r3)+ # must have digit before decimal point ! 539: jbr f3 ! 540: f2: cmpl r0,r6 # limit on packed length ! 541: jleq f4 ! 542: movl r6,r0 ! 543: f4: subl2 r0,r6 # eat some digits ! 544: subl2 r0,exp # from the exponent ! 545: movc3 r0,(r1),(r3) # (most of the) digits to left of decimal point ! 546: movl exp,r0 # need any more? ! 547: jleq f3 ! 548: movc5 $0,(r1),$'0,r0,(r3) # '0 fill ! 549: f3: movl ndigit,r0 # # digits to right of decimal point ! 550: jgtr f5 ! 551: jbs $numsgn,flags,f5 # no decimal point unless forced ! 552: jbcs $dpflag,flags,f6 # no decimal point ! 553: f5: movb $'.,(r3)+ # the decimal point ! 554: f6: mnegl exp,r0 # "leading" zeroes to right of decimal point ! 555: jleq f9 ! 556: cmpl r0,ndigit # cant exceed this many ! 557: jleq fa ! 558: movl ndigit,r0 ! 559: fa: subl2 r0,ndigit ! 560: movc5 $0,(r1),$'0,r0,(r3) ! 561: f9: movl ndigit,r0 ! 562: cmpl r0,r6 # limit on packed length ! 563: jleq f7 ! 564: movl r6,r0 ! 565: f7: subl2 r0,ndigit # eat some digits from the fraction ! 566: movc3 r0,(r1),(r3) # (most of the) digits to right of decimal point ! 567: movl ndigit,r0 # need any more? ! 568: jleq f8 ! 569: # check bounds on users who say %.300f ! 570: movab 32(r3)[r0],r2 ! 571: subl2 fp,r2 ! 572: jlss fb ! 573: subl2 r2,r0 # truncate, willy-nilly ! 574: movl r0,ndigit # and no more digits later, either ! 575: fb: ! 576: # ! 577: subl2 r0,ndigit # eat some digits from the fraction ! 578: movc5 $0,(r1),$'0,r0,(r3) # '0 fill ! 579: f8: movl r3,r5 # addr last byte +1 ! 580: popr $1<1 # [movl (sp)+,r1] addr first byte ! 581: rsb ! 582: ! 583: patexp: .byte 0x03 # eo$set_signif ! 584: .byte 0x44,'e # eo$insert 'e ! 585: .byte 0x42,'+ # eo$load_plus '+ ! 586: .byte 0x04 # eo$store_sign ! 587: .byte 0x92 # eo$move 2 ! 588: .byte 0 # eo$end ! 589: ! 590: scien: ! 591: incl ndigit ! 592: jbs $prec,flags,L23 ! 593: movl $7,ndigit ! 594: L23: bsbw fltcvt # get packed digits ! 595: movl ndigit,r7 ! 596: cmpl r7,$31 # expressible in packed decimal? ! 597: jleq snarro # yes ! 598: movl $31,r7 ! 599: snarro: subl3 $17,r7,r0 # rounding position ! 600: ashp r0,$17,(sp),$5,r7,16(sp) # shift and round ! 601: bvc snovfl ! 602: # band-aid for microcode error (spurious overflow) ! 603: # clrl r0 # assume even length result ! 604: # jlbc ndigit,sceven # right ! 605: # movl $4,r0 # odd length result ! 606: #sceven: cmpv r0,$4,16(sp),$0 # top digit zero iff true overflow ! 607: # bneq snovfl ! 608: # end band-aid ! 609: incl exp # rounding overflowed to 100... ! 610: subl3 $1,r7,r0 ! 611: ashp r0,$1,pone,$0,r7,16(sp) ! 612: ashl $-1,r7,r0 # displ to last byte ! 613: bisb2 sign,16(sp)[r0] # insert sign ! 614: snovfl: ! 615: jbs $gflag,flags,gfmt # %g format ! 616: movab 16(sp),r1 ! 617: bsbb eedit ! 618: eexp: ! 619: movl r1,r6 # save fwa from destruction by cvtlp ! 620: subl3 $1,sexp,r0 # 1P exponent ! 621: cvtlp r0,$2,(sp) # packed ! 622: editpc $2,(sp),patexp,(r5) ! 623: movl r6,r1 # fwa ! 624: jbc $caps,flags,prnum ! 625: xorb2 $'e^'E,-4(r5) ! 626: jbr prnum ! 627: ! 628: eedit: ! 629: movl r7,r6 # packed length ! 630: decl ndigit # 1 digit before decimal point ! 631: movl exp,sexp # save from destruction ! 632: movl $1,exp # and pretend ! 633: jbr fedit ! 634: ! 635: gfmt: ! 636: addl3 $3,exp,r0 # exp is 1 more than e ! 637: jlss gfmte # (e+1)+3<0, e+4<=-1, e<=-5 ! 638: subl2 $3,r0 # exp [==(e+1)] ! 639: cmpl r0,ndigit ! 640: jgtr gfmte # e+1>n, e>=n ! 641: gfmtf: ! 642: movl r7,r6 ! 643: subl2 r0,ndigit # n-e-1 ! 644: movab 16(sp),r1 ! 645: bsbw fedit ! 646: g1: jbs $numsgn,flags,g2 ! 647: jbs $dpflag,flags,g2 # dont strip if no decimal point ! 648: g3: cmpb -(r5),$'0 # strip trailing zeroes ! 649: jeql g3 ! 650: cmpb (r5),$'. # and trailing decimal point ! 651: jeql g2 ! 652: incl r5 ! 653: g2: jbc $gflag,flags,eexp ! 654: jbr prnum ! 655: gfmte: ! 656: movab 16(sp),r1 # packed source ! 657: bsbw eedit ! 658: jbsc $gflag,flags,g1 # gflag now means "use %f" [hence no exponent] ! 659: ! 660: general: ! 661: jbs $prec,flags,gn1 ! 662: movl $6,ndigit # default precision is 6 significant digits ! 663: gn1: tstl ndigit # cannot allow precision of 0 ! 664: jgtr gn2 ! 665: movl $1,ndigit # change 0 to 1, willy-nilly ! 666: gn2: jbcs $gflag,flags,L23 ! 667: jbr L23 # safety net ! 668: ! 669: # convert double-floating at (ap) to 17-digit packed at (sp), ! 670: # set 'sign' and 'exp', advance ap. ! 671: fltcvt: ! 672: clrb sign ! 673: movd (ap)+,r5 ! 674: jeql fzero ! 675: bgtr fpos ! 676: mnegd r5,r5 ! 677: incb sign ! 678: fpos: ! 679: extzv $7,$8,r5,r2 # exponent of 2 ! 680: movab -0200(r2),r2 # unbias ! 681: mull2 $59,r2 # 59/196: 3rd convergent continued frac of log10(2) ! 682: jlss eneg ! 683: movab 196(r2),r2 ! 684: eneg: ! 685: movab -98(r2),r2 ! 686: divl2 $196,r2 ! 687: bsbw expten ! 688: cmpd r0,r5 ! 689: bgtr ceil ! 690: incl r2 ! 691: ceil: movl r2,exp ! 692: mnegl r2,r2 ! 693: cmpl r2,$29 # 10^(29+9) is all we can handle ! 694: bleq getman ! 695: muld2 ten16,r5 ! 696: subl2 $16,r2 ! 697: getman: addl2 $9,r2 # -ceil(log10(x)) + 9 ! 698: jsb expten ! 699: emodd r0,r4,r5,r0,r5 # (r0+r4)*r5; r0=int, r5=frac ! 700: fz1: cvtlp r0,$9,16(sp) # leading 9 digits ! 701: ashp $8,$9,16(sp),$0,$17,4(sp) # as top 9 of 17 ! 702: emodd ten8,$0,r5,r0,r5 ! 703: cvtlp r0,$8,16(sp) # trailing 8 digits ! 704: # if precision >= 17, must round here ! 705: movl ndigit,r7 # so figure out what precision is ! 706: pushab scien ! 707: cmpl (sp)+,(sp) ! 708: jleq gm1 # who called us? ! 709: addl2 exp,r7 # float; adjust for exponent ! 710: gm1: cmpl r7,$17 ! 711: jlss gm2 ! 712: cmpd r5,$0d0.5 # must round here; check fraction ! 713: jlss gm2 ! 714: bisb2 $0x10,8+4(sp) # increment l.s. digit ! 715: gm2: # end of "round here" code ! 716: addp4 $8,16(sp),$17,4(sp) # combine leading and trailing ! 717: bisb2 sign,12(sp) # and insert sign ! 718: rsb ! 719: fzero: clrl r0 ! 720: movl $1,exp # 0.000e+00 and 0.000 rather than 0.000e-01 and .000 ! 721: jbr fz1 ! 722: ! 723: .align 2 ! 724: lsb: .long 0x00010000 # lsb in the crazy floating-point format ! 725: ! 726: # return 10^r2 as a double float in r0||r1 and 8 extra bits of precision in r4 ! 727: # preserve r2, r5||r6 ! 728: expten: ! 729: movd $0d1.0,r0 # begin computing 10^exp10 ! 730: clrl r4 # bit counter ! 731: movad ten1,r3 # table address ! 732: tstl r2 ! 733: bgeq e10lp ! 734: mnegl r2,r2 # get absolute value ! 735: jbss $6,r2,e10lp # flag as negative ! 736: e10lp: jbc r4,r2,el1 # want this power? ! 737: muld2 (r3),r0 # yes ! 738: el1: addl2 $8,r3 # advance to next power ! 739: aobleq $5,r4,e10lp # through 10^32 ! 740: jbcc $6,r2,el2 # correct for negative exponent ! 741: divd3 r0,$0d1.0,r0 # by taking reciprocal ! 742: cmpl $28,r2 ! 743: jneq enm28 ! 744: addl2 lsb,r1 # 10**-28 needs lsb incremented ! 745: enm28: mnegl r2,r2 # original exponent of 10 ! 746: el2: addl3 $5*8,r2,r3 # negative bit positions are illegal? ! 747: jbc r3,xlsbh-5,eoklsb ! 748: subl2 lsb,r1 # lsb was too high ! 749: eoklsb: ! 750: movzbl xprec[r2],r4 # 8 extra bits ! 751: rsb ! 752: ! 753: # powers of ten ! 754: .align 2 ! 755: ten1: .word 0x4220,0,0,0 ! 756: ten2: .word 0x43c8,0,0,0 ! 757: ten4: .word 0x471c,0x4000,0,0 ! 758: ten8: .word 0x4dbe,0xbc20,0,0 ! 759: ten16: .word 0x5b0e,0x1bc9,0xbf04,0 ! 760: ten32: .word 0x759d,0xc5ad,0xa82b,0x70b6 ! 761: ! 762: # whether lsb is too high or not ! 763: .byte 1:0,1:0,1:0,1:0,1:1,1:0,1:1,1:0 # -40 thru -33 ! 764: .byte 1:0,1:1,1:0,1:0,1:0,1:0,1:1,1:0 # -32 thru -25 ! 765: .byte 1:0,1:0,1:1,1:1,1:1,1:1,1:0,1:0 # -24 thru -17 ! 766: .byte 1:0,1:1,1:0,1:0,1:1,1:1,1:1,1:1 # -16 thru -9 ! 767: .byte 1:1,1:1,1:1,1:0,1:0,1:0,1:0,1:1 # -8 thru -1 ! 768: xlsbh: ! 769: .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 0 thru 7 ! 770: .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 8 thru 15 ! 771: .byte 1:0,1:0,1:0,1:0,1:0,1:0,1:0,1:0 # 16 thru 23 ! 772: .byte 1:0,1:1,1:1,1:0,1:1,1:1,1:1,1:1 # 24 thru 31 ! 773: .byte 1:1,1:1,1:1,1:1,1:1,1:1,1:1 # 32 thru 38 ! 774: ! 775: # bytes of extra precision ! 776: .byte 0x56,0x76,0xd3,0x88,0xb5,0x62 # -38 thru -33 ! 777: .byte 0xba,0xf5,0x32,0x3e,0x0e,0x48,0xdb,0x51 # -32 thru -25 ! 778: .byte 0x53,0x27,0xb1,0xef,0xeb,0xa5,0x07,0x49 # -24 thru -17 ! 779: .byte 0x5b,0xd9,0x0f,0x13,0xcd,0xff,0xbf,0x97 # -16 thru -9 ! 780: .byte 0xfd,0xbc,0xb6,0x23,0x2c,0x3b,0x0a,0xcd # -8 thru -1 ! 781: xprec: ! 782: .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 0 thru 7 ! 783: .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 8 thru 15 ! 784: .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 # 16 thru 23 ! 785: .byte 0x00,0xa0,0xc8,0x3a,0x84,0xe4,0xdc,0x92 # 24 thru 31 ! 786: .byte 0x9b,0x00,0xc0,0x58,0xae,0x18,0xef # 32 thru 38
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