new utilities.
the .C files compile but are renamed to avoid building automatically.
diff --git a/src/cmd/dc.c b/src/cmd/dc.c
new file mode 100644
index 0000000..9fe4560
--- /dev/null
+++ b/src/cmd/dc.c
@@ -0,0 +1,2300 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+
+typedef void* pointer;
+
+#define div dcdiv
+
+#define FATAL 0
+#define NFATAL 1
+#define BLK sizeof(Blk)
+#define PTRSZ sizeof(int*)
+#define HEADSZ 1024
+#define STKSZ 100
+#define RDSKSZ 100
+#define TBLSZ 256
+#define ARRAYST 221
+#define MAXIND 2048
+#define NL 1
+#define NG 2
+#define NE 3
+#define length(p) ((p)->wt-(p)->beg)
+#define rewind(p) (p)->rd=(p)->beg
+#define create(p) (p)->rd = (p)->wt = (p)->beg
+#define fsfile(p) (p)->rd = (p)->wt
+#define truncate(p) (p)->wt = (p)->rd
+#define sfeof(p) (((p)->rd==(p)->wt)?1:0)
+#define sfbeg(p) (((p)->rd==(p)->beg)?1:0)
+#define sungetc(p,c) *(--(p)->rd)=c
+#define sgetc(p) (((p)->rd==(p)->wt)?-1:*(p)->rd++)
+#define skipc(p) {if((p)->rd<(p)->wt)(p)->rd++;}
+#define slookc(p) (((p)->rd==(p)->wt)?-1:*(p)->rd)
+#define sbackc(p) (((p)->rd==(p)->beg)?-1:*(--(p)->rd))
+#define backc(p) {if((p)->rd>(p)->beg) --(p)->rd;}
+#define sputc(p,c) {if((p)->wt==(p)->last)more(p);\
+ *(p)->wt++ = c; }
+#define salterc(p,c) {if((p)->rd==(p)->last)more(p);\
+ *(p)->rd++ = c;\
+ if((p)->rd>(p)->wt)(p)->wt=(p)->rd;}
+#define sunputc(p) (*((p)->rd = --(p)->wt))
+#define sclobber(p) ((p)->rd = --(p)->wt)
+#define zero(p) for(pp=(p)->beg;pp<(p)->last;)\
+ *pp++='\0'
+#define OUTC(x) {Bputc(&bout,x); if(--count == 0){Bprint(&bout,"\\\n"); count=ll;} }
+#define TEST2 {if((count -= 2) <=0){Bprint(&bout,"\\\n");count=ll;}}
+#define EMPTY if(stkerr != 0){Bprint(&bout,"stack empty\n"); continue; }
+#define EMPTYR(x) if(stkerr!=0){pushp(x);Bprint(&bout,"stack empty\n");continue;}
+#define EMPTYS if(stkerr != 0){Bprint(&bout,"stack empty\n"); return(1);}
+#define EMPTYSR(x) if(stkerr !=0){Bprint(&bout,"stack empty\n");pushp(x);return(1);}
+#define error(p) {Bprint(&bout,p); continue; }
+#define errorrt(p) {Bprint(&bout,p); return(1); }
+#define LASTFUN 026
+
+typedef struct Blk Blk;
+struct Blk
+{
+ char *rd;
+ char *wt;
+ char *beg;
+ char *last;
+};
+typedef struct Sym Sym;
+struct Sym
+{
+ Sym *next;
+ Blk *val;
+};
+typedef struct Wblk Wblk;
+struct Wblk
+{
+ Blk **rdw;
+ Blk **wtw;
+ Blk **begw;
+ Blk **lastw;
+};
+
+Biobuf *curfile, *fsave;
+Blk *arg1, *arg2;
+uchar savk;
+int dbg;
+int ifile;
+Blk *scalptr, *basptr, *tenptr, *inbas;
+Blk *sqtemp, *chptr, *strptr, *divxyz;
+Blk *stack[STKSZ];
+Blk **stkptr,**stkbeg;
+Blk **stkend;
+Blk *hfree;
+int stkerr;
+int lastchar;
+Blk *readstk[RDSKSZ];
+Blk **readptr;
+Blk *rem;
+int k;
+Blk *irem;
+int skd,skr;
+int neg;
+Sym symlst[TBLSZ];
+Sym *stable[TBLSZ];
+Sym *sptr, *sfree;
+long rel;
+long nbytes;
+long all;
+long headmor;
+long obase;
+int fw,fw1,ll;
+void (*outdit)(Blk *p, int flg);
+int logo;
+int logten;
+int count;
+char *pp;
+char *dummy;
+long longest, maxsize, active;
+int lall, lrel, lcopy, lmore, lbytes;
+int inside;
+Biobuf bin;
+Biobuf bout;
+
+void main(int argc, char *argv[]);
+void commnds(void);
+Blk* readin(void);
+Blk* div(Blk *ddivd, Blk *ddivr);
+int dscale(void);
+Blk* removr(Blk *p, int n);
+Blk* dcsqrt(Blk *p);
+void init(int argc, char *argv[]);
+void onintr(void);
+void pushp(Blk *p);
+Blk* pop(void);
+Blk* readin(void);
+Blk* add0(Blk *p, int ct);
+Blk* mult(Blk *p, Blk *q);
+void chsign(Blk *p);
+int readc(void);
+void unreadc(char c);
+void binop(char c);
+void dcprint(Blk *hptr);
+Blk* dcexp(Blk *base, Blk *ex);
+Blk* getdec(Blk *p, int sc);
+void tenot(Blk *p, int sc);
+void oneot(Blk *p, int sc, char ch);
+void hexot(Blk *p, int flg);
+void bigot(Blk *p, int flg);
+Blk* add(Blk *a1, Blk *a2);
+int eqk(void);
+Blk* removc(Blk *p, int n);
+Blk* scalint(Blk *p);
+Blk* scale(Blk *p, int n);
+int subt(void);
+int command(void);
+int cond(char c);
+void load(void);
+int log2(long n);
+Blk* salloc(int size);
+Blk* morehd(void);
+Blk* copy(Blk *hptr, int size);
+void sdump(char *s1, Blk *hptr);
+void seekc(Blk *hptr, int n);
+void salterwd(Blk *hptr, Blk *n);
+void more(Blk *hptr);
+void ospace(char *s);
+void garbage(char *s);
+void release(Blk *p);
+Blk* dcgetwd(Blk *p);
+void putwd(Blk *p, Blk *c);
+Blk* lookwd(Blk *p);
+char* nalloc(char *p, unsigned nbytes);
+int getstk(void);
+
+/********debug only**/
+void
+tpr(char *cp, Blk *bp)
+{
+ print("%s-> ", cp);
+ print("beg: %lx rd: %lx wt: %lx last: %lx\n", bp->beg, bp->rd,
+ bp->wt, bp->last);
+ for (cp = bp->beg; cp != bp->wt; cp++) {
+ print("%d", *cp);
+ if (cp != bp->wt-1)
+ print("/");
+ }
+ print("\n");
+}
+/************/
+
+void
+main(int argc, char *argv[])
+{
+ Binit(&bin, 0, OREAD);
+ Binit(&bout, 1, OWRITE);
+ init(argc,argv);
+ commnds();
+ exits(0);
+}
+
+void
+commnds(void)
+{
+ Blk *p, *q, **ptr, *s, *t;
+ long l;
+ Sym *sp;
+ int sk, sk1, sk2, c, sign, n, d;
+
+ while(1) {
+ Bflush(&bout);
+ if(((c = readc())>='0' && c <= '9') ||
+ (c>='A' && c <='F') || c == '.') {
+ unreadc(c);
+ p = readin();
+ pushp(p);
+ continue;
+ }
+ switch(c) {
+ case ' ':
+ case '\n':
+ case -1:
+ continue;
+ case 'Y':
+ sdump("stk",*stkptr);
+ Bprint(&bout, "all %ld rel %ld headmor %ld\n",all,rel,headmor);
+ Bprint(&bout, "nbytes %ld\n",nbytes);
+ Bprint(&bout, "longest %ld active %ld maxsize %ld\n", longest,
+ active, maxsize);
+ Bprint(&bout, "new all %d rel %d copy %d more %d lbytes %d\n",
+ lall, lrel, lcopy, lmore, lbytes);
+ lall = lrel = lcopy = lmore = lbytes = 0;
+ continue;
+ case '_':
+ p = readin();
+ savk = sunputc(p);
+ chsign(p);
+ sputc(p,savk);
+ pushp(p);
+ continue;
+ case '-':
+ subt();
+ continue;
+ case '+':
+ if(eqk() != 0)
+ continue;
+ binop('+');
+ continue;
+ case '*':
+ arg1 = pop();
+ EMPTY;
+ arg2 = pop();
+ EMPTYR(arg1);
+ sk1 = sunputc(arg1);
+ sk2 = sunputc(arg2);
+ savk = sk1+sk2;
+ binop('*');
+ p = pop();
+ if(savk>k && savk>sk1 && savk>sk2) {
+ sclobber(p);
+ sk = sk1;
+ if(sk<sk2)
+ sk = sk2;
+ if(sk<k)
+ sk = k;
+ p = removc(p,savk-sk);
+ savk = sk;
+ sputc(p,savk);
+ }
+ pushp(p);
+ continue;
+ case '/':
+ casediv:
+ if(dscale() != 0)
+ continue;
+ binop('/');
+ if(irem != 0)
+ release(irem);
+ release(rem);
+ continue;
+ case '%':
+ if(dscale() != 0)
+ continue;
+ binop('/');
+ p = pop();
+ release(p);
+ if(irem == 0) {
+ sputc(rem,skr+k);
+ pushp(rem);
+ continue;
+ }
+ p = add0(rem,skd-(skr+k));
+ q = add(p,irem);
+ release(p);
+ release(irem);
+ sputc(q,skd);
+ pushp(q);
+ continue;
+ case 'v':
+ p = pop();
+ EMPTY;
+ savk = sunputc(p);
+ if(length(p) == 0) {
+ sputc(p,savk);
+ pushp(p);
+ continue;
+ }
+ if(sbackc(p)<0) {
+ error("sqrt of neg number\n");
+ }
+ if(k<savk)
+ n = savk;
+ else {
+ n = k*2-savk;
+ savk = k;
+ }
+ arg1 = add0(p,n);
+ arg2 = dcsqrt(arg1);
+ sputc(arg2,savk);
+ pushp(arg2);
+ continue;
+
+ case '^':
+ neg = 0;
+ arg1 = pop();
+ EMPTY;
+ if(sunputc(arg1) != 0)
+ error("exp not an integer\n");
+ arg2 = pop();
+ EMPTYR(arg1);
+ if(sfbeg(arg1) == 0 && sbackc(arg1)<0) {
+ neg++;
+ chsign(arg1);
+ }
+ if(length(arg1)>=3) {
+ error("exp too big\n");
+ }
+ savk = sunputc(arg2);
+ p = dcexp(arg2,arg1);
+ release(arg2);
+ rewind(arg1);
+ c = sgetc(arg1);
+ if(c == -1)
+ c = 0;
+ else
+ if(sfeof(arg1) == 0)
+ c = sgetc(arg1)*100 + c;
+ d = c*savk;
+ release(arg1);
+ /* if(neg == 0) { removed to fix -exp bug*/
+ if(k>=savk)
+ n = k;
+ else
+ n = savk;
+ if(n<d) {
+ q = removc(p,d-n);
+ sputc(q,n);
+ pushp(q);
+ } else {
+ sputc(p,d);
+ pushp(p);
+ }
+ /* } else { this is disaster for exp <-127 */
+ /* sputc(p,d); */
+ /* pushp(p); */
+ /* } */
+ if(neg == 0)
+ continue;
+ p = pop();
+ q = salloc(2);
+ sputc(q,1);
+ sputc(q,0);
+ pushp(q);
+ pushp(p);
+ goto casediv;
+ case 'z':
+ p = salloc(2);
+ n = stkptr - stkbeg;
+ if(n >= 100) {
+ sputc(p,n/100);
+ n %= 100;
+ }
+ sputc(p,n);
+ sputc(p,0);
+ pushp(p);
+ continue;
+ case 'Z':
+ p = pop();
+ EMPTY;
+ n = (length(p)-1)<<1;
+ fsfile(p);
+ backc(p);
+ if(sfbeg(p) == 0) {
+ if((c = sbackc(p))<0) {
+ n -= 2;
+ if(sfbeg(p) == 1)
+ n++;
+ else {
+ if((c = sbackc(p)) == 0)
+ n++;
+ else
+ if(c > 90)
+ n--;
+ }
+ } else
+ if(c < 10)
+ n--;
+ }
+ release(p);
+ q = salloc(1);
+ if(n >= 100) {
+ sputc(q,n%100);
+ n /= 100;
+ }
+ sputc(q,n);
+ sputc(q,0);
+ pushp(q);
+ continue;
+ case 'i':
+ p = pop();
+ EMPTY;
+ p = scalint(p);
+ release(inbas);
+ inbas = p;
+ continue;
+ case 'I':
+ p = copy(inbas,length(inbas)+1);
+ sputc(p,0);
+ pushp(p);
+ continue;
+ case 'o':
+ p = pop();
+ EMPTY;
+ p = scalint(p);
+ sign = 0;
+ n = length(p);
+ q = copy(p,n);
+ fsfile(q);
+ l = c = sbackc(q);
+ if(n != 1) {
+ if(c<0) {
+ sign = 1;
+ chsign(q);
+ n = length(q);
+ fsfile(q);
+ l = c = sbackc(q);
+ }
+ if(n != 1) {
+ while(sfbeg(q) == 0)
+ l = l*100+sbackc(q);
+ }
+ }
+ logo = log2(l);
+ obase = l;
+ release(basptr);
+ if(sign == 1)
+ obase = -l;
+ basptr = p;
+ outdit = bigot;
+ if(n == 1 && sign == 0) {
+ if(c <= 16) {
+ outdit = hexot;
+ fw = 1;
+ fw1 = 0;
+ ll = 70;
+ release(q);
+ continue;
+ }
+ }
+ n = 0;
+ if(sign == 1)
+ n++;
+ p = salloc(1);
+ sputc(p,-1);
+ t = add(p,q);
+ n += length(t)*2;
+ fsfile(t);
+ if(sbackc(t)>9)
+ n++;
+ release(t);
+ release(q);
+ release(p);
+ fw = n;
+ fw1 = n-1;
+ ll = 70;
+ if(fw>=ll)
+ continue;
+ ll = (70/fw)*fw;
+ continue;
+ case 'O':
+ p = copy(basptr,length(basptr)+1);
+ sputc(p,0);
+ pushp(p);
+ continue;
+ case '[':
+ n = 0;
+ p = salloc(0);
+ for(;;) {
+ if((c = readc()) == ']') {
+ if(n == 0)
+ break;
+ n--;
+ }
+ sputc(p,c);
+ if(c == '[')
+ n++;
+ }
+ pushp(p);
+ continue;
+ case 'k':
+ p = pop();
+ EMPTY;
+ p = scalint(p);
+ if(length(p)>1) {
+ error("scale too big\n");
+ }
+ rewind(p);
+ k = 0;
+ if(!sfeof(p))
+ k = sgetc(p);
+ release(scalptr);
+ scalptr = p;
+ continue;
+ case 'K':
+ p = copy(scalptr,length(scalptr)+1);
+ sputc(p,0);
+ pushp(p);
+ continue;
+ case 'X':
+ p = pop();
+ EMPTY;
+ fsfile(p);
+ n = sbackc(p);
+ release(p);
+ p = salloc(2);
+ sputc(p,n);
+ sputc(p,0);
+ pushp(p);
+ continue;
+ case 'Q':
+ p = pop();
+ EMPTY;
+ if(length(p)>2) {
+ error("Q?\n");
+ }
+ rewind(p);
+ if((c = sgetc(p))<0) {
+ error("neg Q\n");
+ }
+ release(p);
+ while(c-- > 0) {
+ if(readptr == &readstk[0]) {
+ error("readstk?\n");
+ }
+ if(*readptr != 0)
+ release(*readptr);
+ readptr--;
+ }
+ continue;
+ case 'q':
+ if(readptr <= &readstk[1])
+ exits(0);
+ if(*readptr != 0)
+ release(*readptr);
+ readptr--;
+ if(*readptr != 0)
+ release(*readptr);
+ readptr--;
+ continue;
+ case 'f':
+ if(stkptr == &stack[0])
+ Bprint(&bout,"empty stack\n");
+ else {
+ for(ptr = stkptr; ptr > &stack[0];) {
+ dcprint(*ptr--);
+ }
+ }
+ continue;
+ case 'p':
+ if(stkptr == &stack[0])
+ Bprint(&bout,"empty stack\n");
+ else {
+ dcprint(*stkptr);
+ }
+ continue;
+ case 'P':
+ p = pop();
+ EMPTY;
+ sputc(p,0);
+ Bprint(&bout,"%s",p->beg);
+ release(p);
+ continue;
+ case 'd':
+ if(stkptr == &stack[0]) {
+ Bprint(&bout,"empty stack\n");
+ continue;
+ }
+ q = *stkptr;
+ n = length(q);
+ p = copy(*stkptr,n);
+ pushp(p);
+ continue;
+ case 'c':
+ while(stkerr == 0) {
+ p = pop();
+ if(stkerr == 0)
+ release(p);
+ }
+ continue;
+ case 'S':
+ if(stkptr == &stack[0]) {
+ error("save: args\n");
+ }
+ c = getstk() & 0377;
+ sptr = stable[c];
+ sp = stable[c] = sfree;
+ sfree = sfree->next;
+ if(sfree == 0)
+ goto sempty;
+ sp->next = sptr;
+ p = pop();
+ EMPTY;
+ if(c >= ARRAYST) {
+ q = copy(p,length(p)+PTRSZ);
+ for(n = 0;n < PTRSZ;n++) {
+ sputc(q,0);
+ }
+ release(p);
+ p = q;
+ }
+ sp->val = p;
+ continue;
+ sempty:
+ error("symbol table overflow\n");
+ case 's':
+ if(stkptr == &stack[0]) {
+ error("save:args\n");
+ }
+ c = getstk() & 0377;
+ sptr = stable[c];
+ if(sptr != 0) {
+ p = sptr->val;
+ if(c >= ARRAYST) {
+ rewind(p);
+ while(sfeof(p) == 0)
+ release(dcgetwd(p));
+ }
+ release(p);
+ } else {
+ sptr = stable[c] = sfree;
+ sfree = sfree->next;
+ if(sfree == 0)
+ goto sempty;
+ sptr->next = 0;
+ }
+ p = pop();
+ sptr->val = p;
+ continue;
+ case 'l':
+ load();
+ continue;
+ case 'L':
+ c = getstk() & 0377;
+ sptr = stable[c];
+ if(sptr == 0) {
+ error("L?\n");
+ }
+ stable[c] = sptr->next;
+ sptr->next = sfree;
+ sfree = sptr;
+ p = sptr->val;
+ if(c >= ARRAYST) {
+ rewind(p);
+ while(sfeof(p) == 0) {
+ q = dcgetwd(p);
+ if(q != 0)
+ release(q);
+ }
+ }
+ pushp(p);
+ continue;
+ case ':':
+ p = pop();
+ EMPTY;
+ q = scalint(p);
+ fsfile(q);
+ c = 0;
+ if((sfbeg(q) == 0) && ((c = sbackc(q))<0)) {
+ error("neg index\n");
+ }
+ if(length(q)>2) {
+ error("index too big\n");
+ }
+ if(sfbeg(q) == 0)
+ c = c*100+sbackc(q);
+ if(c >= MAXIND) {
+ error("index too big\n");
+ }
+ release(q);
+ n = getstk() & 0377;
+ sptr = stable[n];
+ if(sptr == 0) {
+ sptr = stable[n] = sfree;
+ sfree = sfree->next;
+ if(sfree == 0)
+ goto sempty;
+ sptr->next = 0;
+ p = salloc((c+PTRSZ)*PTRSZ);
+ zero(p);
+ } else {
+ p = sptr->val;
+ if(length(p)-PTRSZ < c*PTRSZ) {
+ q = copy(p,(c+PTRSZ)*PTRSZ);
+ release(p);
+ p = q;
+ }
+ }
+ seekc(p,c*PTRSZ);
+ q = lookwd(p);
+ if(q!=0)
+ release(q);
+ s = pop();
+ EMPTY;
+ salterwd(p, s);
+ sptr->val = p;
+ continue;
+ case ';':
+ p = pop();
+ EMPTY;
+ q = scalint(p);
+ fsfile(q);
+ c = 0;
+ if((sfbeg(q) == 0) && ((c = sbackc(q))<0)) {
+ error("neg index\n");
+ }
+ if(length(q)>2) {
+ error("index too big\n");
+ }
+ if(sfbeg(q) == 0)
+ c = c*100+sbackc(q);
+ if(c >= MAXIND) {
+ error("index too big\n");
+ }
+ release(q);
+ n = getstk() & 0377;
+ sptr = stable[n];
+ if(sptr != 0){
+ p = sptr->val;
+ if(length(p)-PTRSZ >= c*PTRSZ) {
+ seekc(p,c*PTRSZ);
+ s = dcgetwd(p);
+ if(s != 0) {
+ q = copy(s,length(s));
+ pushp(q);
+ continue;
+ }
+ }
+ }
+ q = salloc(1); /*so uninitialized array elt prints as 0*/
+ sputc(q, 0);
+ pushp(q);
+ continue;
+ case 'x':
+ execute:
+ p = pop();
+ EMPTY;
+ if((readptr != &readstk[0]) && (*readptr != 0)) {
+ if((*readptr)->rd == (*readptr)->wt)
+ release(*readptr);
+ else {
+ if(readptr++ == &readstk[RDSKSZ]) {
+ error("nesting depth\n");
+ }
+ }
+ } else
+ readptr++;
+ *readptr = p;
+ if(p != 0)
+ rewind(p);
+ else {
+ if((c = readc()) != '\n')
+ unreadc(c);
+ }
+ continue;
+ case '?':
+ if(++readptr == &readstk[RDSKSZ]) {
+ error("nesting depth\n");
+ }
+ *readptr = 0;
+ fsave = curfile;
+ curfile = &bin;
+ while((c = readc()) == '!')
+ command();
+ p = salloc(0);
+ sputc(p,c);
+ while((c = readc()) != '\n') {
+ sputc(p,c);
+ if(c == '\\')
+ sputc(p,readc());
+ }
+ curfile = fsave;
+ *readptr = p;
+ continue;
+ case '!':
+ if(command() == 1)
+ goto execute;
+ continue;
+ case '<':
+ case '>':
+ case '=':
+ if(cond(c) == 1)
+ goto execute;
+ continue;
+ default:
+ Bprint(&bout,"%o is unimplemented\n",c);
+ }
+ }
+}
+
+Blk*
+div(Blk *ddivd, Blk *ddivr)
+{
+ int divsign, remsign, offset, divcarry,
+ carry, dig, magic, d, dd, under, first;
+ long c, td, cc;
+ Blk *ps, *px, *p, *divd, *divr;
+
+ dig = 0;
+ under = 0;
+ divcarry = 0;
+ rem = 0;
+ p = salloc(0);
+ if(length(ddivr) == 0) {
+ pushp(ddivr);
+ Bprint(&bout,"divide by 0\n");
+ return(p);
+ }
+ divsign = remsign = first = 0;
+ divr = ddivr;
+ fsfile(divr);
+ if(sbackc(divr) == -1) {
+ divr = copy(ddivr,length(ddivr));
+ chsign(divr);
+ divsign = ~divsign;
+ }
+ divd = copy(ddivd,length(ddivd));
+ fsfile(divd);
+ if(sfbeg(divd) == 0 && sbackc(divd) == -1) {
+ chsign(divd);
+ divsign = ~divsign;
+ remsign = ~remsign;
+ }
+ offset = length(divd) - length(divr);
+ if(offset < 0)
+ goto ddone;
+ seekc(p,offset+1);
+ sputc(divd,0);
+ magic = 0;
+ fsfile(divr);
+ c = sbackc(divr);
+ if(c < 10)
+ magic++;
+ c = c * 100 + (sfbeg(divr)?0:sbackc(divr));
+ if(magic>0){
+ c = (c * 100 +(sfbeg(divr)?0:sbackc(divr)))*2;
+ c /= 25;
+ }
+ while(offset >= 0) {
+ first++;
+ fsfile(divd);
+ td = sbackc(divd) * 100;
+ dd = sfbeg(divd)?0:sbackc(divd);
+ td = (td + dd) * 100;
+ dd = sfbeg(divd)?0:sbackc(divd);
+ td = td + dd;
+ cc = c;
+ if(offset == 0)
+ td++;
+ else
+ cc++;
+ if(magic != 0)
+ td = td<<3;
+ dig = td/cc;
+ under=0;
+ if(td%cc < 8 && dig > 0 && magic) {
+ dig--;
+ under=1;
+ }
+ rewind(divr);
+ rewind(divxyz);
+ carry = 0;
+ while(sfeof(divr) == 0) {
+ d = sgetc(divr)*dig+carry;
+ carry = d / 100;
+ salterc(divxyz,d%100);
+ }
+ salterc(divxyz,carry);
+ rewind(divxyz);
+ seekc(divd,offset);
+ carry = 0;
+ while(sfeof(divd) == 0) {
+ d = slookc(divd);
+ d = d-(sfeof(divxyz)?0:sgetc(divxyz))-carry;
+ carry = 0;
+ if(d < 0) {
+ d += 100;
+ carry = 1;
+ }
+ salterc(divd,d);
+ }
+ divcarry = carry;
+ backc(p);
+ salterc(p,dig);
+ backc(p);
+ fsfile(divd);
+ d=sbackc(divd);
+ if((d != 0) && /*!divcarry*/ (offset != 0)) {
+ d = sbackc(divd) + 100;
+ salterc(divd,d);
+ }
+ if(--offset >= 0)
+ divd->wt--;
+ }
+ if(under) { /* undershot last - adjust*/
+ px = copy(divr,length(divr)); /*11/88 don't corrupt ddivr*/
+ chsign(px);
+ ps = add(px,divd);
+ fsfile(ps);
+ if(length(ps) > 0 && sbackc(ps) < 0) {
+ release(ps); /*only adjust in really undershot*/
+ } else {
+ release(divd);
+ salterc(p, dig+1);
+ divd=ps;
+ }
+ }
+ if(divcarry != 0) {
+ salterc(p,dig-1);
+ salterc(divd,-1);
+ ps = add(divr,divd);
+ release(divd);
+ divd = ps;
+ }
+
+ rewind(p);
+ divcarry = 0;
+ while(sfeof(p) == 0){
+ d = slookc(p)+divcarry;
+ divcarry = 0;
+ if(d >= 100){
+ d -= 100;
+ divcarry = 1;
+ }
+ salterc(p,d);
+ }
+ if(divcarry != 0)salterc(p,divcarry);
+ fsfile(p);
+ while(sfbeg(p) == 0) {
+ if(sbackc(p) != 0)
+ break;
+ truncate(p);
+ }
+ if(divsign < 0)
+ chsign(p);
+ fsfile(divd);
+ while(sfbeg(divd) == 0) {
+ if(sbackc(divd) != 0)
+ break;
+ truncate(divd);
+ }
+ddone:
+ if(remsign<0)
+ chsign(divd);
+ if(divr != ddivr)
+ release(divr);
+ rem = divd;
+ return(p);
+}
+
+int
+dscale(void)
+{
+ Blk *dd, *dr, *r;
+ int c;
+
+ dr = pop();
+ EMPTYS;
+ dd = pop();
+ EMPTYSR(dr);
+ fsfile(dd);
+ skd = sunputc(dd);
+ fsfile(dr);
+ skr = sunputc(dr);
+ if(sfbeg(dr) == 1 || (sfbeg(dr) == 0 && sbackc(dr) == 0)) {
+ sputc(dr,skr);
+ pushp(dr);
+ Bprint(&bout,"divide by 0\n");
+ return(1);
+ }
+ if(sfbeg(dd) == 1 || (sfbeg(dd) == 0 && sbackc(dd) == 0)) {
+ sputc(dd,skd);
+ pushp(dd);
+ return(1);
+ }
+ c = k-skd+skr;
+ if(c < 0)
+ r = removr(dd,-c);
+ else {
+ r = add0(dd,c);
+ irem = 0;
+ }
+ arg1 = r;
+ arg2 = dr;
+ savk = k;
+ return(0);
+}
+
+Blk*
+removr(Blk *p, int n)
+{
+ int nn, neg;
+ Blk *q, *s, *r;
+
+ fsfile(p);
+ neg = sbackc(p);
+ if(neg < 0)
+ chsign(p);
+ rewind(p);
+ nn = (n+1)/2;
+ q = salloc(nn);
+ while(n>1) {
+ sputc(q,sgetc(p));
+ n -= 2;
+ }
+ r = salloc(2);
+ while(sfeof(p) == 0)
+ sputc(r,sgetc(p));
+ release(p);
+ if(n == 1){
+ s = div(r,tenptr);
+ release(r);
+ rewind(rem);
+ if(sfeof(rem) == 0)
+ sputc(q,sgetc(rem));
+ release(rem);
+ if(neg < 0){
+ chsign(s);
+ chsign(q);
+ irem = q;
+ return(s);
+ }
+ irem = q;
+ return(s);
+ }
+ if(neg < 0) {
+ chsign(r);
+ chsign(q);
+ irem = q;
+ return(r);
+ }
+ irem = q;
+ return(r);
+}
+
+Blk*
+dcsqrt(Blk *p)
+{
+ Blk *t, *r, *q, *s;
+ int c, n, nn;
+
+ n = length(p);
+ fsfile(p);
+ c = sbackc(p);
+ if((n&1) != 1)
+ c = c*100+(sfbeg(p)?0:sbackc(p));
+ n = (n+1)>>1;
+ r = salloc(n);
+ zero(r);
+ seekc(r,n);
+ nn=1;
+ while((c -= nn)>=0)
+ nn+=2;
+ c=(nn+1)>>1;
+ fsfile(r);
+ backc(r);
+ if(c>=100) {
+ c -= 100;
+ salterc(r,c);
+ sputc(r,1);
+ } else
+ salterc(r,c);
+ for(;;){
+ q = div(p,r);
+ s = add(q,r);
+ release(q);
+ release(rem);
+ q = div(s,sqtemp);
+ release(s);
+ release(rem);
+ s = copy(r,length(r));
+ chsign(s);
+ t = add(s,q);
+ release(s);
+ fsfile(t);
+ nn = sfbeg(t)?0:sbackc(t);
+ if(nn>=0)
+ break;
+ release(r);
+ release(t);
+ r = q;
+ }
+ release(t);
+ release(q);
+ release(p);
+ return(r);
+}
+
+Blk*
+dcexp(Blk *base, Blk *ex)
+{
+ Blk *r, *e, *p, *e1, *t, *cp;
+ int temp, c, n;
+
+ r = salloc(1);
+ sputc(r,1);
+ p = copy(base,length(base));
+ e = copy(ex,length(ex));
+ fsfile(e);
+ if(sfbeg(e) != 0)
+ goto edone;
+ temp=0;
+ c = sbackc(e);
+ if(c<0) {
+ temp++;
+ chsign(e);
+ }
+ while(length(e) != 0) {
+ e1=div(e,sqtemp);
+ release(e);
+ e = e1;
+ n = length(rem);
+ release(rem);
+ if(n != 0) {
+ e1=mult(p,r);
+ release(r);
+ r = e1;
+ }
+ t = copy(p,length(p));
+ cp = mult(p,t);
+ release(p);
+ release(t);
+ p = cp;
+ }
+ if(temp != 0) {
+ if((c = length(base)) == 0) {
+ goto edone;
+ }
+ if(c>1)
+ create(r);
+ else {
+ rewind(base);
+ if((c = sgetc(base))<=1) {
+ create(r);
+ sputc(r,c);
+ } else
+ create(r);
+ }
+ }
+edone:
+ release(p);
+ release(e);
+ return(r);
+}
+
+void
+init(int argc, char *argv[])
+{
+ Sym *sp;
+ Dir *d;
+
+ ARGBEGIN {
+ default:
+ dbg = 1;
+ break;
+ } ARGEND
+ ifile = 1;
+ curfile = &bin;
+ if(*argv){
+ d = dirstat(*argv);
+ if(d == nil) {
+ fprint(2, "dc: can't open file %s\n", *argv);
+ exits("open");
+ }
+ if(d->mode & DMDIR) {
+ fprint(2, "dc: file %s is a directory\n", *argv);
+ exits("open");
+ }
+ free(d);
+ if((curfile = Bopen(*argv, OREAD)) == 0) {
+ fprint(2,"dc: can't open file %s\n", *argv);
+ exits("open");
+ }
+ }
+/* dummy = malloc(0); *//* prepare for garbage-collection */
+ scalptr = salloc(1);
+ sputc(scalptr,0);
+ basptr = salloc(1);
+ sputc(basptr,10);
+ obase=10;
+ logten=log2(10L);
+ ll=70;
+ fw=1;
+ fw1=0;
+ tenptr = salloc(1);
+ sputc(tenptr,10);
+ obase=10;
+ inbas = salloc(1);
+ sputc(inbas,10);
+ sqtemp = salloc(1);
+ sputc(sqtemp,2);
+ chptr = salloc(0);
+ strptr = salloc(0);
+ divxyz = salloc(0);
+ stkbeg = stkptr = &stack[0];
+ stkend = &stack[STKSZ];
+ stkerr = 0;
+ readptr = &readstk[0];
+ k=0;
+ sp = sptr = &symlst[0];
+ while(sptr < &symlst[TBLSZ]) {
+ sptr->next = ++sp;
+ sptr++;
+ }
+ sptr->next=0;
+ sfree = &symlst[0];
+}
+
+void
+pushp(Blk *p)
+{
+ if(stkptr == stkend) {
+ Bprint(&bout,"out of stack space\n");
+ return;
+ }
+ stkerr=0;
+ *++stkptr = p;
+ return;
+}
+
+Blk*
+pop(void)
+{
+ if(stkptr == stack) {
+ stkerr=1;
+ return(0);
+ }
+ return(*stkptr--);
+}
+
+Blk*
+readin(void)
+{
+ Blk *p, *q;
+ int dp, dpct, c;
+
+ dp = dpct=0;
+ p = salloc(0);
+ for(;;){
+ c = readc();
+ switch(c) {
+ case '.':
+ if(dp != 0)
+ goto gotnum;
+ dp++;
+ continue;
+ case '\\':
+ readc();
+ continue;
+ default:
+ if(c >= 'A' && c <= 'F')
+ c = c - 'A' + 10;
+ else
+ if(c >= '0' && c <= '9')
+ c -= '0';
+ else
+ goto gotnum;
+ if(dp != 0) {
+ if(dpct >= 99)
+ continue;
+ dpct++;
+ }
+ create(chptr);
+ if(c != 0)
+ sputc(chptr,c);
+ q = mult(p,inbas);
+ release(p);
+ p = add(chptr,q);
+ release(q);
+ }
+ }
+gotnum:
+ unreadc(c);
+ if(dp == 0) {
+ sputc(p,0);
+ return(p);
+ } else {
+ q = scale(p,dpct);
+ return(q);
+ }
+}
+
+/*
+ * returns pointer to struct with ct 0's & p
+ */
+Blk*
+add0(Blk *p, int ct)
+{
+ Blk *q, *t;
+
+ q = salloc(length(p)+(ct+1)/2);
+ while(ct>1) {
+ sputc(q,0);
+ ct -= 2;
+ }
+ rewind(p);
+ while(sfeof(p) == 0) {
+ sputc(q,sgetc(p));
+ }
+ release(p);
+ if(ct == 1) {
+ t = mult(tenptr,q);
+ release(q);
+ return(t);
+ }
+ return(q);
+}
+
+Blk*
+mult(Blk *p, Blk *q)
+{
+ Blk *mp, *mq, *mr;
+ int sign, offset, carry;
+ int cq, cp, mt, mcr;
+
+ offset = sign = 0;
+ fsfile(p);
+ mp = p;
+ if(sfbeg(p) == 0) {
+ if(sbackc(p)<0) {
+ mp = copy(p,length(p));
+ chsign(mp);
+ sign = ~sign;
+ }
+ }
+ fsfile(q);
+ mq = q;
+ if(sfbeg(q) == 0){
+ if(sbackc(q)<0) {
+ mq = copy(q,length(q));
+ chsign(mq);
+ sign = ~sign;
+ }
+ }
+ mr = salloc(length(mp)+length(mq));
+ zero(mr);
+ rewind(mq);
+ while(sfeof(mq) == 0) {
+ cq = sgetc(mq);
+ rewind(mp);
+ rewind(mr);
+ mr->rd += offset;
+ carry=0;
+ while(sfeof(mp) == 0) {
+ cp = sgetc(mp);
+ mcr = sfeof(mr)?0:slookc(mr);
+ mt = cp*cq + carry + mcr;
+ carry = mt/100;
+ salterc(mr,mt%100);
+ }
+ offset++;
+ if(carry != 0) {
+ mcr = sfeof(mr)?0:slookc(mr);
+ salterc(mr,mcr+carry);
+ }
+ }
+ if(sign < 0) {
+ chsign(mr);
+ }
+ if(mp != p)
+ release(mp);
+ if(mq != q)
+ release(mq);
+ return(mr);
+}
+
+void
+chsign(Blk *p)
+{
+ int carry;
+ char ct;
+
+ carry=0;
+ rewind(p);
+ while(sfeof(p) == 0) {
+ ct=100-slookc(p)-carry;
+ carry=1;
+ if(ct>=100) {
+ ct -= 100;
+ carry=0;
+ }
+ salterc(p,ct);
+ }
+ if(carry != 0) {
+ sputc(p,-1);
+ fsfile(p);
+ backc(p);
+ ct = sbackc(p);
+ if(ct == 99 /*&& !sfbeg(p)*/) {
+ truncate(p);
+ sputc(p,-1);
+ }
+ } else{
+ fsfile(p);
+ ct = sbackc(p);
+ if(ct == 0)
+ truncate(p);
+ }
+ return;
+}
+
+int
+readc(void)
+{
+loop:
+ if((readptr != &readstk[0]) && (*readptr != 0)) {
+ if(sfeof(*readptr) == 0)
+ return(lastchar = sgetc(*readptr));
+ release(*readptr);
+ readptr--;
+ goto loop;
+ }
+ lastchar = Bgetc(curfile);
+ if(lastchar != -1)
+ return(lastchar);
+ if(readptr != &readptr[0]) {
+ readptr--;
+ if(*readptr == 0)
+ curfile = &bin;
+ goto loop;
+ }
+ if(curfile != &bin) {
+ Bterm(curfile);
+ curfile = &bin;
+ goto loop;
+ }
+ exits(0);
+ return 0; /* shut up ken */
+}
+
+void
+unreadc(char c)
+{
+
+ if((readptr != &readstk[0]) && (*readptr != 0)) {
+ sungetc(*readptr,c);
+ } else
+ Bungetc(curfile);
+ return;
+}
+
+void
+binop(char c)
+{
+ Blk *r;
+
+ r = 0;
+ switch(c) {
+ case '+':
+ r = add(arg1,arg2);
+ break;
+ case '*':
+ r = mult(arg1,arg2);
+ break;
+ case '/':
+ r = div(arg1,arg2);
+ break;
+ }
+ release(arg1);
+ release(arg2);
+ sputc(r,savk);
+ pushp(r);
+}
+
+void
+dcprint(Blk *hptr)
+{
+ Blk *p, *q, *dec;
+ int dig, dout, ct, sc;
+
+ rewind(hptr);
+ while(sfeof(hptr) == 0) {
+ if(sgetc(hptr)>99) {
+ rewind(hptr);
+ while(sfeof(hptr) == 0) {
+ Bprint(&bout,"%c",sgetc(hptr));
+ }
+ Bprint(&bout,"\n");
+ return;
+ }
+ }
+ fsfile(hptr);
+ sc = sbackc(hptr);
+ if(sfbeg(hptr) != 0) {
+ Bprint(&bout,"0\n");
+ return;
+ }
+ count = ll;
+ p = copy(hptr,length(hptr));
+ sclobber(p);
+ fsfile(p);
+ if(sbackc(p)<0) {
+ chsign(p);
+ OUTC('-');
+ }
+ if((obase == 0) || (obase == -1)) {
+ oneot(p,sc,'d');
+ return;
+ }
+ if(obase == 1) {
+ oneot(p,sc,'1');
+ return;
+ }
+ if(obase == 10) {
+ tenot(p,sc);
+ return;
+ }
+ /* sleazy hack to scale top of stack - divide by 1 */
+ pushp(p);
+ sputc(p, sc);
+ p=salloc(0);
+ create(p);
+ sputc(p, 1);
+ sputc(p, 0);
+ pushp(p);
+ if(dscale() != 0)
+ return;
+ p = div(arg1, arg2);
+ release(arg1);
+ release(arg2);
+ sc = savk;
+
+ create(strptr);
+ dig = logten*sc;
+ dout = ((dig/10) + dig) / logo;
+ dec = getdec(p,sc);
+ p = removc(p,sc);
+ while(length(p) != 0) {
+ q = div(p,basptr);
+ release(p);
+ p = q;
+ (*outdit)(rem,0);
+ }
+ release(p);
+ fsfile(strptr);
+ while(sfbeg(strptr) == 0)
+ OUTC(sbackc(strptr));
+ if(sc == 0) {
+ release(dec);
+ Bprint(&bout,"\n");
+ return;
+ }
+ create(strptr);
+ OUTC('.');
+ ct=0;
+ do {
+ q = mult(basptr,dec);
+ release(dec);
+ dec = getdec(q,sc);
+ p = removc(q,sc);
+ (*outdit)(p,1);
+ } while(++ct < dout);
+ release(dec);
+ rewind(strptr);
+ while(sfeof(strptr) == 0)
+ OUTC(sgetc(strptr));
+ Bprint(&bout,"\n");
+}
+
+Blk*
+getdec(Blk *p, int sc)
+{
+ int cc;
+ Blk *q, *t, *s;
+
+ rewind(p);
+ if(length(p)*2 < sc) {
+ q = copy(p,length(p));
+ return(q);
+ }
+ q = salloc(length(p));
+ while(sc >= 1) {
+ sputc(q,sgetc(p));
+ sc -= 2;
+ }
+ if(sc != 0) {
+ t = mult(q,tenptr);
+ s = salloc(cc = length(q));
+ release(q);
+ rewind(t);
+ while(cc-- > 0)
+ sputc(s,sgetc(t));
+ sputc(s,0);
+ release(t);
+ t = div(s,tenptr);
+ release(s);
+ release(rem);
+ return(t);
+ }
+ return(q);
+}
+
+void
+tenot(Blk *p, int sc)
+{
+ int c, f;
+
+ fsfile(p);
+ f=0;
+ while((sfbeg(p) == 0) && ((p->rd-p->beg-1)*2 >= sc)) {
+ c = sbackc(p);
+ if((c<10) && (f == 1))
+ Bprint(&bout,"0%d",c);
+ else
+ Bprint(&bout,"%d",c);
+ f=1;
+ TEST2;
+ }
+ if(sc == 0) {
+ Bprint(&bout,"\n");
+ release(p);
+ return;
+ }
+ if((p->rd-p->beg)*2 > sc) {
+ c = sbackc(p);
+ Bprint(&bout,"%d.",c/10);
+ TEST2;
+ OUTC(c%10 +'0');
+ sc--;
+ } else {
+ OUTC('.');
+ }
+ while(sc>(p->rd-p->beg)*2) {
+ OUTC('0');
+ sc--;
+ }
+ while(sc > 1) {
+ c = sbackc(p);
+ if(c<10)
+ Bprint(&bout,"0%d",c);
+ else
+ Bprint(&bout,"%d",c);
+ sc -= 2;
+ TEST2;
+ }
+ if(sc == 1) {
+ OUTC(sbackc(p)/10 +'0');
+ }
+ Bprint(&bout,"\n");
+ release(p);
+}
+
+void
+oneot(Blk *p, int sc, char ch)
+{
+ Blk *q;
+
+ q = removc(p,sc);
+ create(strptr);
+ sputc(strptr,-1);
+ while(length(q)>0) {
+ p = add(strptr,q);
+ release(q);
+ q = p;
+ OUTC(ch);
+ }
+ release(q);
+ Bprint(&bout,"\n");
+}
+
+void
+hexot(Blk *p, int flg)
+{
+ int c;
+
+ USED(flg);
+ rewind(p);
+ if(sfeof(p) != 0) {
+ sputc(strptr,'0');
+ release(p);
+ return;
+ }
+ c = sgetc(p);
+ release(p);
+ if(c >= 16) {
+ Bprint(&bout,"hex digit > 16");
+ return;
+ }
+ sputc(strptr,c<10?c+'0':c-10+'a');
+}
+
+void
+bigot(Blk *p, int flg)
+{
+ Blk *t, *q;
+ int neg, l;
+
+ if(flg == 1) {
+ t = salloc(0);
+ l = 0;
+ } else {
+ t = strptr;
+ l = length(strptr)+fw-1;
+ }
+ neg=0;
+ if(length(p) != 0) {
+ fsfile(p);
+ if(sbackc(p)<0) {
+ neg=1;
+ chsign(p);
+ }
+ while(length(p) != 0) {
+ q = div(p,tenptr);
+ release(p);
+ p = q;
+ rewind(rem);
+ sputc(t,sfeof(rem)?'0':sgetc(rem)+'0');
+ release(rem);
+ }
+ }
+ release(p);
+ if(flg == 1) {
+ l = fw1-length(t);
+ if(neg != 0) {
+ l--;
+ sputc(strptr,'-');
+ }
+ fsfile(t);
+ while(l-- > 0)
+ sputc(strptr,'0');
+ while(sfbeg(t) == 0)
+ sputc(strptr,sbackc(t));
+ release(t);
+ } else {
+ l -= length(strptr);
+ while(l-- > 0)
+ sputc(strptr,'0');
+ if(neg != 0) {
+ sclobber(strptr);
+ sputc(strptr,'-');
+ }
+ }
+ sputc(strptr,' ');
+}
+
+Blk*
+add(Blk *a1, Blk *a2)
+{
+ Blk *p;
+ int carry, n, size, c, n1, n2;
+
+ size = length(a1)>length(a2)?length(a1):length(a2);
+ p = salloc(size);
+ rewind(a1);
+ rewind(a2);
+ carry=0;
+ while(--size >= 0) {
+ n1 = sfeof(a1)?0:sgetc(a1);
+ n2 = sfeof(a2)?0:sgetc(a2);
+ n = n1 + n2 + carry;
+ if(n>=100) {
+ carry=1;
+ n -= 100;
+ } else
+ if(n<0) {
+ carry = -1;
+ n += 100;
+ } else
+ carry = 0;
+ sputc(p,n);
+ }
+ if(carry != 0)
+ sputc(p,carry);
+ fsfile(p);
+ if(sfbeg(p) == 0) {
+ c = 0;
+ while(sfbeg(p) == 0 && (c = sbackc(p)) == 0)
+ ;
+ if(c != 0)
+ salterc(p,c);
+ truncate(p);
+ }
+ fsfile(p);
+ if(sfbeg(p) == 0 && sbackc(p) == -1) {
+ while((c = sbackc(p)) == 99) {
+ if(c == -1)
+ break;
+ }
+ skipc(p);
+ salterc(p,-1);
+ truncate(p);
+ }
+ return(p);
+}
+
+int
+eqk(void)
+{
+ Blk *p, *q;
+ int skp, skq;
+
+ p = pop();
+ EMPTYS;
+ q = pop();
+ EMPTYSR(p);
+ skp = sunputc(p);
+ skq = sunputc(q);
+ if(skp == skq) {
+ arg1=p;
+ arg2=q;
+ savk = skp;
+ return(0);
+ }
+ if(skp < skq) {
+ savk = skq;
+ p = add0(p,skq-skp);
+ } else {
+ savk = skp;
+ q = add0(q,skp-skq);
+ }
+ arg1=p;
+ arg2=q;
+ return(0);
+}
+
+Blk*
+removc(Blk *p, int n)
+{
+ Blk *q, *r;
+
+ rewind(p);
+ while(n>1) {
+ skipc(p);
+ n -= 2;
+ }
+ q = salloc(2);
+ while(sfeof(p) == 0)
+ sputc(q,sgetc(p));
+ if(n == 1) {
+ r = div(q,tenptr);
+ release(q);
+ release(rem);
+ q = r;
+ }
+ release(p);
+ return(q);
+}
+
+Blk*
+scalint(Blk *p)
+{
+ int n;
+
+ n = sunputc(p);
+ p = removc(p,n);
+ return(p);
+}
+
+Blk*
+scale(Blk *p, int n)
+{
+ Blk *q, *s, *t;
+
+ t = add0(p,n);
+ q = salloc(1);
+ sputc(q,n);
+ s = dcexp(inbas,q);
+ release(q);
+ q = div(t,s);
+ release(t);
+ release(s);
+ release(rem);
+ sputc(q,n);
+ return(q);
+}
+
+int
+subt(void)
+{
+ arg1=pop();
+ EMPTYS;
+ savk = sunputc(arg1);
+ chsign(arg1);
+ sputc(arg1,savk);
+ pushp(arg1);
+ if(eqk() != 0)
+ return(1);
+ binop('+');
+ return(0);
+}
+
+int
+command(void)
+{
+ char line[100], *sl;
+ int pid, p, c;
+
+ switch(c = readc()) {
+ case '<':
+ return(cond(NL));
+ case '>':
+ return(cond(NG));
+ case '=':
+ return(cond(NE));
+ default:
+ sl = line;
+ *sl++ = c;
+ while((c = readc()) != '\n')
+ *sl++ = c;
+ *sl = 0;
+ if((pid = fork()) == 0) {
+ execl("/bin/rc","rc","-c",line,0);
+ exits("shell");
+ }
+ for(;;) {
+ if((p = waitpid()) < 0)
+ break;
+ if(p== pid)
+ break;
+ }
+ Bprint(&bout,"!\n");
+ return(0);
+ }
+}
+
+int
+cond(char c)
+{
+ Blk *p;
+ int cc;
+
+ if(subt() != 0)
+ return(1);
+ p = pop();
+ sclobber(p);
+ if(length(p) == 0) {
+ release(p);
+ if(c == '<' || c == '>' || c == NE) {
+ getstk();
+ return(0);
+ }
+ load();
+ return(1);
+ }
+ if(c == '='){
+ release(p);
+ getstk();
+ return(0);
+ }
+ if(c == NE) {
+ release(p);
+ load();
+ return(1);
+ }
+ fsfile(p);
+ cc = sbackc(p);
+ release(p);
+ if((cc<0 && (c == '<' || c == NG)) ||
+ (cc >0) && (c == '>' || c == NL)) {
+ getstk();
+ return(0);
+ }
+ load();
+ return(1);
+}
+
+void
+load(void)
+{
+ int c;
+ Blk *p, *q, *t, *s;
+
+ c = getstk() & 0377;
+ sptr = stable[c];
+ if(sptr != 0) {
+ p = sptr->val;
+ if(c >= ARRAYST) {
+ q = salloc(length(p));
+ rewind(p);
+ while(sfeof(p) == 0) {
+ s = dcgetwd(p);
+ if(s == 0) {
+ putwd(q, (Blk*)0);
+ } else {
+ t = copy(s,length(s));
+ putwd(q,t);
+ }
+ }
+ pushp(q);
+ } else {
+ q = copy(p,length(p));
+ pushp(q);
+ }
+ } else {
+ q = salloc(1);
+ if(c <= LASTFUN) {
+ Bprint(&bout,"function %c undefined\n",c+'a'-1);
+ sputc(q,'c');
+ sputc(q,'0');
+ sputc(q,' ');
+ sputc(q,'1');
+ sputc(q,'Q');
+ }
+ else
+ sputc(q,0);
+ pushp(q);
+ }
+}
+
+int
+log2(long n)
+{
+ int i;
+
+ if(n == 0)
+ return(0);
+ i=31;
+ if(n<0)
+ return(i);
+ while((n= n<<1) >0)
+ i--;
+ return i-1;
+}
+
+Blk*
+salloc(int size)
+{
+ Blk *hdr;
+ char *ptr;
+
+ all++;
+ lall++;
+ if(all - rel > active)
+ active = all - rel;
+ nbytes += size;
+ lbytes += size;
+ if(nbytes >maxsize)
+ maxsize = nbytes;
+ if(size > longest)
+ longest = size;
+ ptr = malloc((unsigned)size);
+ if(ptr == 0){
+ garbage("salloc");
+ if((ptr = malloc((unsigned)size)) == 0)
+ ospace("salloc");
+ }
+ if((hdr = hfree) == 0)
+ hdr = morehd();
+ hfree = (Blk *)hdr->rd;
+ hdr->rd = hdr->wt = hdr->beg = ptr;
+ hdr->last = ptr+size;
+ return(hdr);
+}
+
+Blk*
+morehd(void)
+{
+ Blk *h, *kk;
+
+ headmor++;
+ nbytes += HEADSZ;
+ hfree = h = (Blk *)malloc(HEADSZ);
+ if(hfree == 0) {
+ garbage("morehd");
+ if((hfree = h = (Blk*)malloc(HEADSZ)) == 0)
+ ospace("headers");
+ }
+ kk = h;
+ while(h<hfree+(HEADSZ/BLK))
+ (h++)->rd = (char*)++kk;
+ (h-1)->rd=0;
+ return(hfree);
+}
+
+Blk*
+copy(Blk *hptr, int size)
+{
+ Blk *hdr;
+ unsigned sz;
+ char *ptr;
+
+ all++;
+ lall++;
+ lcopy++;
+ nbytes += size;
+ lbytes += size;
+ if(size > longest)
+ longest = size;
+ if(size > maxsize)
+ maxsize = size;
+ sz = length(hptr);
+ ptr = nalloc(hptr->beg, size);
+ if(ptr == 0) {
+ garbage("copy");
+ if((ptr = nalloc(hptr->beg, size)) == 0) {
+ Bprint(&bout,"copy size %d\n",size);
+ ospace("copy");
+ }
+ }
+ if((hdr = hfree) == 0)
+ hdr = morehd();
+ hfree = (Blk *)hdr->rd;
+ hdr->rd = hdr->beg = ptr;
+ hdr->last = ptr+size;
+ hdr->wt = ptr+sz;
+ ptr = hdr->wt;
+ while(ptr<hdr->last)
+ *ptr++ = '\0';
+ return(hdr);
+}
+
+void
+sdump(char *s1, Blk *hptr)
+{
+ char *p;
+
+ Bprint(&bout,"%s %lx rd %lx wt %lx beg %lx last %lx\n",
+ s1,hptr,hptr->rd,hptr->wt,hptr->beg,hptr->last);
+ p = hptr->beg;
+ while(p < hptr->wt)
+ Bprint(&bout,"%d ",*p++);
+ Bprint(&bout,"\n");
+}
+
+void
+seekc(Blk *hptr, int n)
+{
+ char *nn,*p;
+
+ nn = hptr->beg+n;
+ if(nn > hptr->last) {
+ nbytes += nn - hptr->last;
+ if(nbytes > maxsize)
+ maxsize = nbytes;
+ lbytes += nn - hptr->last;
+ if(n > longest)
+ longest = n;
+/* free(hptr->beg); *//**/
+ p = realloc(hptr->beg, n);
+ if(p == 0) {
+/* hptr->beg = realloc(hptr->beg, hptr->last-hptr->beg);
+** garbage("seekc");
+** if((p = realloc(hptr->beg, n)) == 0)
+*/ ospace("seekc");
+ }
+ hptr->beg = p;
+ hptr->wt = hptr->last = hptr->rd = p+n;
+ return;
+ }
+ hptr->rd = nn;
+ if(nn>hptr->wt)
+ hptr->wt = nn;
+}
+
+void
+salterwd(Blk *ahptr, Blk *n)
+{
+ Wblk *hptr;
+
+ hptr = (Wblk*)ahptr;
+ if(hptr->rdw == hptr->lastw)
+ more(ahptr);
+ *hptr->rdw++ = n;
+ if(hptr->rdw > hptr->wtw)
+ hptr->wtw = hptr->rdw;
+}
+
+void
+more(Blk *hptr)
+{
+ unsigned size;
+ char *p;
+
+ if((size=(hptr->last-hptr->beg)*2) == 0)
+ size=2;
+ nbytes += size/2;
+ if(nbytes > maxsize)
+ maxsize = nbytes;
+ if(size > longest)
+ longest = size;
+ lbytes += size/2;
+ lmore++;
+/* free(hptr->beg);*//**/
+ p = realloc(hptr->beg, size);
+
+ if(p == 0) {
+/* hptr->beg = realloc(hptr->beg, (hptr->last-hptr->beg));
+** garbage("more");
+** if((p = realloc(hptr->beg,size)) == 0)
+*/ ospace("more");
+ }
+ hptr->rd = p + (hptr->rd - hptr->beg);
+ hptr->wt = p + (hptr->wt - hptr->beg);
+ hptr->beg = p;
+ hptr->last = p+size;
+}
+
+void
+ospace(char *s)
+{
+ Bprint(&bout,"out of space: %s\n",s);
+ Bprint(&bout,"all %ld rel %ld headmor %ld\n",all,rel,headmor);
+ Bprint(&bout,"nbytes %ld\n",nbytes);
+ sdump("stk",*stkptr);
+ abort();
+}
+
+void
+garbage(char *s)
+{
+ USED(s);
+}
+
+void
+release(Blk *p)
+{
+ rel++;
+ lrel++;
+ nbytes -= p->last - p->beg;
+ p->rd = (char*)hfree;
+ hfree = p;
+ free(p->beg);
+}
+
+Blk*
+dcgetwd(Blk *p)
+{
+ Wblk *wp;
+
+ wp = (Wblk*)p;
+ if(wp->rdw == wp->wtw)
+ return(0);
+ return(*wp->rdw++);
+}
+
+void
+putwd(Blk *p, Blk *c)
+{
+ Wblk *wp;
+
+ wp = (Wblk*)p;
+ if(wp->wtw == wp->lastw)
+ more(p);
+ *wp->wtw++ = c;
+}
+
+Blk*
+lookwd(Blk *p)
+{
+ Wblk *wp;
+
+ wp = (Wblk*)p;
+ if(wp->rdw == wp->wtw)
+ return(0);
+ return(*wp->rdw);
+}
+
+char*
+nalloc(char *p, unsigned nbytes)
+{
+ char *q, *r;
+
+ q = r = malloc(nbytes);
+ if(q==0)
+ return(0);
+ while(nbytes--)
+ *q++ = *p++;
+ return(r);
+}
+
+int
+getstk(void)
+{
+ int n;
+ uchar c;
+
+ c = readc();
+ if(c != '<')
+ return c;
+ n = 0;
+ while(1) {
+ c = readc();
+ if(c == '>')
+ break;
+ n = n*10+c-'0';
+ }
+ return n;
+}
