projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| cc439dd6 C |
1 | #ifndef lint |
| 2 | static char *rcsid = | |
| 3 | "$Header: pbignum.c,v 1.3 83/09/12 14:17:59 sklower Exp $"; | |
| 4 | #endif | |
| 5 | ||
| 6 | /* -[Sat Jan 29 13:30:47 1983 by jkf]- | |
| 7 | * pbignum.c $Locker: $ | |
| 8 | * print a bignum | |
| 9 | * | |
| 10 | * (c) copyright 1982, Regents of the University of California | |
| 11 | */ | |
| 12 | ||
| 13 | #include "global.h" | |
| 14 | ||
| 15 | pbignum(current, useport) | |
| 16 | register lispval current; | |
| 17 | register FILE *useport; | |
| 18 | { | |
| 19 | long *top, *bot, *work, negflag = 0; | |
| 20 | char *alloca(); | |
| 21 | register int *digitp; | |
| 22 | Keepxs(); | |
| 23 | ||
| 24 | /* copy bignum onto stack */ | |
| 25 | top = (sp()) - 1; | |
| 26 | do { | |
| 27 | stack(current->s.I); | |
| 28 | } while(current = current->s.CDR); | |
| 29 | ||
| 30 | bot = sp(); | |
| 31 | if (top==bot) { | |
| 32 | fprintf(useport,"%d",*bot); | |
| 33 | Freexs(); | |
| 34 | return; | |
| 35 | } | |
| 36 | ||
| 37 | /* save space for printed digits*/ | |
| 38 | work = (int *)alloca((top-bot)*2*sizeof(int)); | |
| 39 | if( *bot < 0) { | |
| 40 | negflag = 1; | |
| 41 | dsneg(top,bot); | |
| 42 | } | |
| 43 | ||
| 44 | /* figure out nine digits at a time by destructive division*/ | |
| 45 | for(digitp = work; bot <= top; digitp++) { | |
| 46 | *digitp = dodiv(top,bot); | |
| 47 | if(*bot==0) bot += 1; | |
| 48 | } | |
| 49 | ||
| 50 | /* print them out */ | |
| 51 | ||
| 52 | if(negflag) putc('-',useport); | |
| 53 | fprintf(useport,"%d",*--digitp); | |
| 54 | while ( digitp > work) fprintf(useport,"%.09d",*--digitp); | |
| 55 | Freexs(); | |
| 56 | } |