File:  [gforth] / gforth / prim
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    1: \ Gforth primitives
    2: 
    3: \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: 
   21: 
   22: \ WARNING: This file is processed by m4. Make sure your identifiers
   23: \ don't collide with m4's (e.g. by undefining them).
   24: \ 
   25: \ 
   26: \ 
   27: \ This file contains primitive specifications in the following format:
   28: \ 
   29: \ forth name	stack effect	category	[pronunciation]
   30: \ [""glossary entry""]
   31: \ C code
   32: \ [:
   33: \ Forth code]
   34: \ 
   35: \ prims2x is pedantic about tabs vs. blanks. The fields of the first
   36: \ line of a primitive are separated by tabs, the stack items in a
   37: \ stack effect by blanks.
   38: \
   39: \ Both pronounciation and stack items (in the stack effect) must
   40: \ conform to the C name syntax or the C compiler will complain.
   41: \ 
   42: \ 
   43: \ These specifications are automatically translated into C-code for the
   44: \ interpreter and into some other files. I hope that your C compiler has
   45: \ decent optimization, otherwise the automatically generated code will
   46: \ be somewhat slow. The Forth version of the code is included for manual
   47: \ compilers, so they will need to compile only the important words.
   48: \ 
   49: \ Note that stack pointer adjustment is performed according to stack
   50: \ effect by automatically generated code and NEXT is automatically
   51: \ appended to the C code. Also, you can use the names in the stack
   52: \ effect in the C code. Stack access is automatic. One exception: if
   53: \ your code does not fall through, the results are not stored into the
   54: \ stack. Use different names on both sides of the '--', if you change a
   55: \ value (some stores to the stack are optimized away).
   56: \ 
   57: \ 
   58: \ 
   59: \ The stack variables have the following types:
   60: \ 
   61: \ name matches	type
   62: \ f.*		Bool
   63: \ c.*		Char
   64: \ [nw].*		Cell
   65: \ u.*		UCell
   66: \ d.*		DCell
   67: \ ud.*		UDCell
   68: \ r.*		Float
   69: \ a_.*		Cell *
   70: \ c_.*		Char *
   71: \ f_.*		Float *
   72: \ df_.*		DFloat *
   73: \ sf_.*		SFloat *
   74: \ xt.*		XT
   75: \ wid.*		WID
   76: \ f83name.*	F83Name *
   77: \ 
   78: \ 
   79: \ 
   80: \ In addition the following names can be used:
   81: \ ip	the instruction pointer
   82: \ sp	the data stack pointer
   83: \ rp	the parameter stack pointer
   84: \ lp	the locals stack pointer
   85: \ NEXT	executes NEXT
   86: \ cfa	
   87: \ NEXT1	executes NEXT1
   88: \ FLAG(x)	makes a Forth flag from a C flag
   89: \ 
   90: \ 
   91: \ 
   92: \ Percentages in comments are from Koopmans book: average/maximum use
   93: \ (taken from four, not very representative benchmarks)
   94: \ 
   95: \ 
   96: \ 
   97: \ To do:
   98: \ 
   99: \ throw execute, cfa and NEXT1 out?
  100: \ macroize *ip, ip++, *ip++ (pipelining)?
  101: 
  102: \ these m4 macros would collide with identifiers
  103: undefine(`index')
  104: undefine(`shift')
  105: 
  106: noop	--		gforth
  107: ;
  108: :
  109:  ;
  110: 
  111: lit	-- w		gforth
  112: w = (Cell)NEXT_INST;
  113: INC_IP(1);
  114: :
  115:  r> dup @ swap cell+ >r ;
  116: 
  117: execute		xt --		core
  118: ""Perform the semantics represented by the execution token, @i{xt}.""
  119: ip=IP;
  120: IF_TOS(TOS = sp[0]);
  121: EXEC(xt);
  122: 
  123: perform		a_addr --	gforth
  124: ""Equivalent to @code{@ execute}.""
  125: /* and pfe */
  126: ip=IP;
  127: IF_TOS(TOS = sp[0]);
  128: EXEC(*(Xt *)a_addr);
  129: :
  130:  @ execute ;
  131: 
  132: \fhas? skipbranchprims 0= [IF]
  133: \+glocals
  134: 
  135: branch-lp+!#	--	gforth	branch_lp_plus_store_number
  136: /* this will probably not be used */
  137: branch_adjust_lp:
  138: lp += (Cell)(IP[1]);
  139: goto branch;
  140: 
  141: \+
  142: 
  143: branch	--		gforth
  144: branch:
  145: SET_IP((Xt *)(((Cell)IP)+(Cell)NEXT_INST));
  146: :
  147:  r> dup @ + >r ;
  148: 
  149: \ condbranch(forthname,restline,code,forthcode)
  150: \ this is non-syntactical: code must open a brace that is closed by the macro
  151: define(condbranch,
  152: $1	$2
  153: $3	SET_IP((Xt *)(((Cell)IP)+(Cell)NEXT_INST));
  154: 	NEXT;
  155: }
  156: else
  157:     INC_IP(1);
  158: $4
  159: 
  160: \+glocals
  161: 
  162: $1-lp+!#	$2_lp_plus_store_number
  163: $3    goto branch_adjust_lp;
  164: }
  165: else
  166:     INC_IP(2);
  167: 
  168: \+
  169: )
  170: 
  171: condbranch(?branch,f --		f83	question_branch,
  172: if (f==0) {
  173:     IF_TOS(TOS = sp[0]);
  174: ,:
  175:  0= dup     \ !f !f
  176:  r> dup @   \ !f !f IP branchoffset
  177:  rot and +  \ !f IP|IP+branchoffset
  178:  swap 0= cell and + \ IP''
  179:  >r ;)
  180: 
  181: \ we don't need an lp_plus_store version of the ?dup-stuff, because it
  182: \ is only used in if's (yet)
  183: 
  184: \+xconds
  185: 
  186: ?dup-?branch	f -- f	new	question_dupe_question_branch
  187: ""The run-time procedure compiled by @code{?DUP-IF}.""
  188: if (f==0) {
  189:   sp++;
  190:   IF_TOS(TOS = sp[0]);
  191:   SET_IP((Xt *)(((Cell)IP)+(Cell)NEXT_INST));
  192:   NEXT;
  193: }
  194: else
  195:   INC_IP(1);
  196: 
  197: ?dup-0=-?branch	f --	new	question_dupe_zero_equals_question_branch
  198: ""The run-time procedure compiled by @code{?DUP-0=-IF}.""
  199: /* the approach taken here of declaring the word as having the stack
  200: effect ( f -- ) and correcting for it in the branch-taken case costs a
  201: few cycles in that case, but is easy to convert to a CONDBRANCH
  202: invocation */
  203: if (f!=0) {
  204:   sp--;
  205:   SET_IP((Xt *)(((Cell)IP)+(Cell)NEXT_INST));
  206:   NEXT;
  207: }
  208: else
  209:   INC_IP(1);
  210: 
  211: \+
  212: \f[THEN]
  213: \fhas? skiploopprims 0= [IF]
  214: 
  215: condbranch((next),--		cmFORTH	paren_next,
  216: if ((*rp)--) {
  217: ,:
  218:  r> r> dup 1- >r
  219:  IF dup @ + >r ELSE cell+ >r THEN ;)
  220: 
  221: condbranch((loop),--		gforth	paren_loop,
  222: Cell index = *rp+1;
  223: Cell limit = rp[1];
  224: if (index != limit) {
  225:     *rp = index;
  226: ,:
  227:  r> r> 1+ r> 2dup =
  228:  IF >r 1- >r cell+ >r
  229:  ELSE >r >r dup @ + >r THEN ;)
  230: 
  231: condbranch((+loop),n --		gforth	paren_plus_loop,
  232: /* !! check this thoroughly */
  233: Cell index = *rp;
  234: /* sign bit manipulation and test: (x^y)<0 is equivalent to (x<0) != (y<0) */
  235: /* dependent upon two's complement arithmetic */
  236: Cell olddiff = index-rp[1];
  237: if ((olddiff^(olddiff+n))>=0   /* the limit is not crossed */
  238:     || (olddiff^n)>=0          /* it is a wrap-around effect */) {
  239: #ifdef i386
  240:     *rp += n;
  241: #else
  242:     *rp = index + n;
  243: #endif
  244:     IF_TOS(TOS = sp[0]);
  245: ,:
  246:  r> swap
  247:  r> r> 2dup - >r
  248:  2 pick r@ + r@ xor 0< 0=
  249:  3 pick r> xor 0< 0= or
  250:  IF    >r + >r dup @ + >r
  251:  ELSE  >r >r drop cell+ >r THEN ;)
  252: 
  253: \+xconds
  254: 
  255: condbranch((-loop),u --		gforth	paren_minus_loop,
  256: /* !! check this thoroughly */
  257: Cell index = *rp;
  258: UCell olddiff = index-rp[1];
  259: if (olddiff>u) {
  260: #ifdef i386
  261:     *rp -= u;
  262: #else
  263:     *rp = index - u;
  264: #endif
  265:     IF_TOS(TOS = sp[0]);
  266: ,)
  267: 
  268: condbranch((s+loop),n --		gforth	paren_symmetric_plus_loop,
  269: ""The run-time procedure compiled by S+LOOP. It loops until the index
  270: crosses the boundary between limit and limit-sign(n). I.e. a symmetric
  271: version of (+LOOP).""
  272: /* !! check this thoroughly */
  273: Cell index = *rp;
  274: Cell diff = index-rp[1];
  275: Cell newdiff = diff+n;
  276: if (n<0) {
  277:     diff = -diff;
  278:     newdiff = -newdiff;
  279: }
  280: if (diff>=0 || newdiff<0) {
  281: #ifdef i386
  282:     *rp += n;
  283: #else
  284:     *rp = index + n;
  285: #endif
  286:     IF_TOS(TOS = sp[0]);
  287: ,)
  288: 
  289: \+
  290: 
  291: unloop		--	core
  292: rp += 2;
  293: :
  294:  r> rdrop rdrop >r ;
  295: 
  296: (for)	ncount --		cmFORTH		paren_for
  297: /* or (for) = >r -- collides with unloop! */
  298: *--rp = 0;
  299: *--rp = ncount;
  300: :
  301:  r> swap 0 >r >r >r ;
  302: 
  303: (do)	nlimit nstart --		gforth		paren_do
  304: /* or do it in high-level? 0.09/0.23% */
  305: *--rp = nlimit;
  306: *--rp = nstart;
  307: :
  308:  r> swap rot >r >r >r ;
  309: 
  310: (?do)	nlimit nstart --	gforth	paren_question_do
  311: *--rp = nlimit;
  312: *--rp = nstart;
  313: if (nstart == nlimit) {
  314:     IF_TOS(TOS = sp[0]);
  315:     goto branch;
  316:     }
  317: else {
  318:     INC_IP(1);
  319: }
  320: :
  321:   2dup =
  322:   IF   r> swap rot >r >r
  323:        dup @ + >r
  324:   ELSE r> swap rot >r >r
  325:        cell+ >r
  326:   THEN ;				\ --> CORE-EXT
  327: 
  328: \+xconds
  329: 
  330: (+do)	nlimit nstart --	gforth	paren_plus_do
  331: *--rp = nlimit;
  332: *--rp = nstart;
  333: if (nstart >= nlimit) {
  334:     IF_TOS(TOS = sp[0]);
  335:     goto branch;
  336:     }
  337: else {
  338:     INC_IP(1);
  339: }
  340: :
  341:  swap 2dup
  342:  r> swap >r swap >r
  343:  >=
  344:  IF
  345:      dup @ +
  346:  ELSE
  347:      cell+
  348:  THEN  >r ;
  349: 
  350: (u+do)	ulimit ustart --	gforth	paren_u_plus_do
  351: *--rp = ulimit;
  352: *--rp = ustart;
  353: if (ustart >= ulimit) {
  354:     IF_TOS(TOS = sp[0]);
  355:     goto branch;
  356:     }
  357: else {
  358:     INC_IP(1);
  359: }
  360: :
  361:  swap 2dup
  362:  r> swap >r swap >r
  363:  u>=
  364:  IF
  365:      dup @ +
  366:  ELSE
  367:      cell+
  368:  THEN  >r ;
  369: 
  370: (-do)	nlimit nstart --	gforth	paren_minus_do
  371: *--rp = nlimit;
  372: *--rp = nstart;
  373: if (nstart <= nlimit) {
  374:     IF_TOS(TOS = sp[0]);
  375:     goto branch;
  376:     }
  377: else {
  378:     INC_IP(1);
  379: }
  380: :
  381:  swap 2dup
  382:  r> swap >r swap >r
  383:  <=
  384:  IF
  385:      dup @ +
  386:  ELSE
  387:      cell+
  388:  THEN  >r ;
  389: 
  390: (u-do)	ulimit ustart --	gforth	paren_u_minus_do
  391: *--rp = ulimit;
  392: *--rp = ustart;
  393: if (ustart <= ulimit) {
  394:     IF_TOS(TOS = sp[0]);
  395:     goto branch;
  396:     }
  397: else {
  398:     INC_IP(1);
  399: }
  400: :
  401:  swap 2dup
  402:  r> swap >r swap >r
  403:  u<=
  404:  IF
  405:      dup @ +
  406:  ELSE
  407:      cell+
  408:  THEN  >r ;
  409: 
  410: \+
  411: 
  412: \ don't make any assumptions where the return stack is!!
  413: \ implement this in machine code if it should run quickly!
  414: 
  415: i	-- n		core
  416: n = *rp;
  417: :
  418: \ rp@ cell+ @ ;
  419:   r> r> tuck >r >r ;
  420: 
  421: i'	-- w		gforth		i_tick
  422: ""loop end value""
  423: w = rp[1];
  424: :
  425: \ rp@ cell+ cell+ @ ;
  426:   r> r> r> dup itmp ! >r >r >r itmp @ ;
  427: variable itmp
  428: 
  429: j	-- n		core
  430: n = rp[2];
  431: :
  432: \ rp@ cell+ cell+ cell+ @ ;
  433:   r> r> r> r> dup itmp ! >r >r >r >r itmp @ ;
  434: [IFUNDEF] itmp variable itmp [THEN]
  435: 
  436: k	-- n		gforth
  437: n = rp[4];
  438: :
  439: \ rp@ [ 5 cells ] Literal + @ ;
  440:   r> r> r> r> r> r> dup itmp ! >r >r >r >r >r >r itmp @ ;
  441: [IFUNDEF] itmp variable itmp [THEN]
  442: 
  443: \f[THEN]
  444: 
  445: \ digit is high-level: 0/0%
  446: 
  447: move	c_from c_to ucount --		core
  448: ""Copy the contents of @i{ucount} address units at @i{c-from} to
  449: @i{c-to}. @code{move} works correctly even if the two areas overlap.""
  450: memmove(c_to,c_from,ucount);
  451: /* make an Ifdef for bsd and others? */
  452: :
  453:  >r 2dup u< IF r> cmove> ELSE r> cmove THEN ;
  454: 
  455: cmove	c_from c_to u --	string	c_move
  456: ""Copy the contents of @i{ucount} characters from data space at
  457: @i{c-from} to @i{c-to}. The copy proceeds @code{char}-by-@code{char}
  458: from low address to high address; i.e., for overlapping areas it is
  459: safe if @i{c-to}=<@i{c-from}.""
  460: while (u-- > 0)
  461:   *c_to++ = *c_from++;
  462: :
  463:  bounds ?DO  dup c@ I c! 1+  LOOP  drop ;
  464: 
  465: cmove>	c_from c_to u --	string	c_move_up
  466: ""Copy the contents of @i{ucount} characters from data space at
  467: @i{c-from} to @i{c-to}. The copy proceeds @code{char}-by-@code{char}
  468: from high address to low address; i.e., for overlapping areas it is
  469: safe if @i{c-to}>=@i{c-from}.""
  470: while (u-- > 0)
  471:   c_to[u] = c_from[u];
  472: :
  473:  dup 0= IF  drop 2drop exit  THEN
  474:  rot over + -rot bounds swap 1-
  475:  DO  1- dup c@ I c!  -1 +LOOP  drop ;
  476: 
  477: fill	c_addr u c --	core
  478: "" If @i{u}>0, store character @i{c} in each of @i{u} consecutive
  479: @code{char} addresses in memory, starting at address @i{c-addr}.""
  480: memset(c_addr,c,u);
  481: :
  482:  -rot bounds
  483:  ?DO  dup I c!  LOOP  drop ;
  484: 
  485: compare		c_addr1 u1 c_addr2 u2 -- n	string
  486: ""Compare two strings lexicographically. If they are equal, @i{n} is 0; if
  487: the first string is smaller, @i{n} is -1; if the first string is larger, @i{n}
  488: is 1. Currently this is based on the machine's character
  489: comparison. In the future, this may change to consider the current
  490: locale and its collation order.""
  491: /* close ' to keep fontify happy */ 
  492: n = memcmp(c_addr1, c_addr2, u1<u2 ? u1 : u2);
  493: if (n==0)
  494:   n = u1-u2;
  495: if (n<0)
  496:   n = -1;
  497: else if (n>0)
  498:   n = 1;
  499: :
  500:  rot 2dup swap - >r min swap -text dup
  501:  IF  rdrop  ELSE  drop r> sgn  THEN ;
  502: : sgn ( n -- -1/0/1 )
  503:  dup 0= IF EXIT THEN  0< 2* 1+ ;
  504: 
  505: -text		c_addr1 u c_addr2 -- n	new	dash_text
  506: n = memcmp(c_addr1, c_addr2, u);
  507: if (n<0)
  508:   n = -1;
  509: else if (n>0)
  510:   n = 1;
  511: :
  512:  swap bounds
  513:  ?DO  dup c@ I c@ = WHILE  1+  LOOP  drop 0
  514:  ELSE  c@ I c@ - unloop  THEN  -text-flag ;
  515: : sgn ( n -- -1/0/1 )
  516:  dup 0= IF EXIT THEN  0< 2* 1+ ;
  517: 
  518: toupper	c1 -- c2	gforth
  519: ""If @i{c1} is a lower-case character (in the current locale), @i{c2}
  520: is the equivalent upper-case character. All other characters are unchanged.""
  521: c2 = toupper(c1);
  522: :
  523:  dup [char] a - [ char z char a - 1 + ] Literal u<  bl and - ;
  524: 
  525: capscomp	c_addr1 u c_addr2 -- n	new
  526: n = memcasecmp(c_addr1, c_addr2, u); /* !! use something that works in all locales */
  527: if (n<0)
  528:   n = -1;
  529: else if (n>0)
  530:   n = 1;
  531: :
  532:  swap bounds
  533:  ?DO  dup c@ I c@ <>
  534:      IF  dup c@ toupper I c@ toupper =
  535:      ELSE  true  THEN  WHILE  1+  LOOP  drop 0
  536:  ELSE  c@ toupper I c@ toupper - unloop  THEN  -text-flag ;
  537: 
  538: -trailing	c_addr u1 -- c_addr u2		string	dash_trailing
  539: ""Adjust the string specified by @i{c-addr, u1} to remove all trailing
  540: spaces. @i{u2} is the length of the modified string.""
  541: u2 = u1;
  542: while (u2>0 && c_addr[u2-1] == ' ')
  543:   u2--;
  544: :
  545:  BEGIN  1- 2dup + c@ bl =  WHILE
  546:         dup  0= UNTIL  ELSE  1+  THEN ;
  547: 
  548: /string		c_addr1 u1 n -- c_addr2 u2	string	slash_string
  549: ""Adjust the string specified by @i{c-addr1, u1} to remove @i{n}
  550: characters from the start of the string.""
  551: c_addr2 = c_addr1+n;
  552: u2 = u1-n;
  553: :
  554:  tuck - >r + r> dup 0< IF  - 0  THEN ;
  555: 
  556: +	n1 n2 -- n		core	plus
  557: n = n1+n2;
  558: 
  559: \ PFE-0.9.14 has it differently, but the next release will have it as follows
  560: under+	n1 n2 n3 -- n n2	gforth	under_plus
  561: ""add @i{n3} to @i{n1} (giving @i{n})""
  562: n = n1+n3;
  563: :
  564:  rot + swap ;
  565: 
  566: -	n1 n2 -- n		core	minus
  567: n = n1-n2;
  568: :
  569:  negate + ;
  570: 
  571: negate	n1 -- n2		core
  572: /* use minus as alias */
  573: n2 = -n1;
  574: :
  575:  invert 1+ ;
  576: 
  577: 1+	n1 -- n2		core		one_plus
  578: n2 = n1+1;
  579: :
  580:  1 + ;
  581: 
  582: 1-	n1 -- n2		core		one_minus
  583: n2 = n1-1;
  584: :
  585:  1 - ;
  586: 
  587: max	n1 n2 -- n	core
  588: if (n1<n2)
  589:   n = n2;
  590: else
  591:   n = n1;
  592: :
  593:  2dup < IF swap THEN drop ;
  594: 
  595: min	n1 n2 -- n	core
  596: if (n1<n2)
  597:   n = n1;
  598: else
  599:   n = n2;
  600: :
  601:  2dup > IF swap THEN drop ;
  602: 
  603: abs	n1 -- n2	core
  604: if (n1<0)
  605:   n2 = -n1;
  606: else
  607:   n2 = n1;
  608: :
  609:  dup 0< IF negate THEN ;
  610: 
  611: *	n1 n2 -- n		core	star
  612: n = n1*n2;
  613: :
  614:  um* drop ;
  615: 
  616: /	n1 n2 -- n		core	slash
  617: n = n1/n2;
  618: :
  619:  /mod nip ;
  620: 
  621: mod	n1 n2 -- n		core
  622: n = n1%n2;
  623: :
  624:  /mod drop ;
  625: 
  626: /mod	n1 n2 -- n3 n4		core		slash_mod
  627: n4 = n1/n2;
  628: n3 = n1%n2; /* !! is this correct? look into C standard! */
  629: :
  630:  >r s>d r> fm/mod ;
  631: 
  632: 2*	n1 -- n2		core		two_star
  633: n2 = 2*n1;
  634: :
  635:  dup + ;
  636: 
  637: 2/	n1 -- n2		core		two_slash
  638: /* !! is this still correct? */
  639: n2 = n1>>1;
  640: :
  641:  dup MINI and IF 1 ELSE 0 THEN
  642:  [ bits/byte cell * 1- ] literal 
  643:  0 DO 2* swap dup 2* >r MINI and 
  644:      IF 1 ELSE 0 THEN or r> swap
  645:  LOOP nip ;
  646: 
  647: fm/mod	d1 n1 -- n2 n3		core		f_m_slash_mod
  648: ""Floored division: @i{d1} = @i{n3}*@i{n1}+@i{n2}, @i{n1}>@i{n2}>=0 or 0>=@i{n2}>@i{n1}.""
  649: #ifdef BUGGY_LONG_LONG
  650: DCell r = fmdiv(d1,n1);
  651: n2=r.hi;
  652: n3=r.lo;
  653: #else
  654: /* assumes that the processor uses either floored or symmetric division */
  655: n3 = d1/n1;
  656: n2 = d1%n1;
  657: /* note that this 1%-3>0 is optimized by the compiler */
  658: if (1%-3>0 && (d1<0) != (n1<0) && n2!=0) {
  659:   n3--;
  660:   n2+=n1;
  661: }
  662: #endif
  663: :
  664:  dup >r dup 0< IF  negate >r dnegate r>  THEN
  665:  over       0< IF  tuck + swap  THEN
  666:  um/mod
  667:  r> 0< IF  swap negate swap  THEN ;
  668: 
  669: sm/rem	d1 n1 -- n2 n3		core		s_m_slash_rem
  670: ""Symmetric division: @i{d1} = @i{n3}*@i{n1}+@i{n2}, sign(@i{n2})=sign(@i{d1}) or 0.""
  671: #ifdef BUGGY_LONG_LONG
  672: DCell r = smdiv(d1,n1);
  673: n2=r.hi;
  674: n3=r.lo;
  675: #else
  676: /* assumes that the processor uses either floored or symmetric division */
  677: n3 = d1/n1;
  678: n2 = d1%n1;
  679: /* note that this 1%-3<0 is optimized by the compiler */
  680: if (1%-3<0 && (d1<0) != (n1<0) && n2!=0) {
  681:   n3++;
  682:   n2-=n1;
  683: }
  684: #endif
  685: :
  686:  over >r dup >r abs -rot
  687:  dabs rot um/mod
  688:  r> r@ xor 0< IF       negate       THEN
  689:  r>        0< IF  swap negate swap  THEN ;
  690: 
  691: m*	n1 n2 -- d		core	m_star
  692: #ifdef BUGGY_LONG_LONG
  693: d = mmul(n1,n2);
  694: #else
  695: d = (DCell)n1 * (DCell)n2;
  696: #endif
  697: :
  698:  2dup      0< and >r
  699:  2dup swap 0< and >r
  700:  um* r> - r> - ;
  701: 
  702: um*	u1 u2 -- ud		core	u_m_star
  703: /* use u* as alias */
  704: #ifdef BUGGY_LONG_LONG
  705: ud = ummul(u1,u2);
  706: #else
  707: ud = (UDCell)u1 * (UDCell)u2;
  708: #endif
  709: :
  710:    >r >r 0 0 r> r> [ 8 cells ] literal 0
  711:    DO
  712:        over >r dup >r 0< and d2*+ drop
  713:        r> 2* r> swap
  714:    LOOP 2drop ;
  715: : d2*+ ( ud n -- ud+n c )
  716:    over MINI
  717:    and >r >r 2dup d+ swap r> + swap r> ;
  718: 
  719: um/mod	ud u1 -- u2 u3		core	u_m_slash_mod
  720: ""ud=u3*u1+u2, u1>u2>=0""
  721: #ifdef BUGGY_LONG_LONG
  722: UDCell r = umdiv(ud,u1);
  723: u2=r.hi;
  724: u3=r.lo;
  725: #else
  726: u3 = ud/u1;
  727: u2 = ud%u1;
  728: #endif
  729: :
  730:    0 swap [ 8 cells 1 + ] literal 0
  731:    ?DO /modstep
  732:    LOOP drop swap 1 rshift or swap ;
  733: : /modstep ( ud c R: u -- ud-?u c R: u )
  734:    >r over r@ u< 0= or IF r@ - 1 ELSE 0 THEN  d2*+ r> ;
  735: : d2*+ ( ud n -- ud+n c )
  736:    over MINI
  737:    and >r >r 2dup d+ swap r> + swap r> ;
  738: 
  739: m+	d1 n -- d2		double		m_plus
  740: #ifdef BUGGY_LONG_LONG
  741: d2.lo = d1.lo+n;
  742: d2.hi = d1.hi - (n<0) + (d2.lo<d1.lo);
  743: #else
  744: d2 = d1+n;
  745: #endif
  746: :
  747:  s>d d+ ;
  748: 
  749: d+	d1 d2 -- d		double	d_plus
  750: #ifdef BUGGY_LONG_LONG
  751: d.lo = d1.lo+d2.lo;
  752: d.hi = d1.hi + d2.hi + (d.lo<d1.lo);
  753: #else
  754: d = d1+d2;
  755: #endif
  756: :
  757:  rot + >r tuck + swap over u> r> swap - ;
  758: 
  759: d-	d1 d2 -- d		double		d_minus
  760: #ifdef BUGGY_LONG_LONG
  761: d.lo = d1.lo - d2.lo;
  762: d.hi = d1.hi-d2.hi-(d1.lo<d2.lo);
  763: #else
  764: d = d1-d2;
  765: #endif
  766: :
  767:  dnegate d+ ;
  768: 
  769: dnegate	d1 -- d2		double	d_negate
  770: /* use dminus as alias */
  771: #ifdef BUGGY_LONG_LONG
  772: d2 = dnegate(d1);
  773: #else
  774: d2 = -d1;
  775: #endif
  776: :
  777:  invert swap negate tuck 0= - ;
  778: 
  779: d2*	d1 -- d2		double		d_two_star
  780: #ifdef BUGGY_LONG_LONG
  781: d2.lo = d1.lo<<1;
  782: d2.hi = (d1.hi<<1) | (d1.lo>>(CELL_BITS-1));
  783: #else
  784: d2 = 2*d1;
  785: #endif
  786: :
  787:  2dup d+ ;
  788: 
  789: d2/	d1 -- d2		double		d_two_slash
  790: #ifdef BUGGY_LONG_LONG
  791: d2.hi = d1.hi>>1;
  792: d2.lo= (d1.lo>>1) | (d1.hi<<(CELL_BITS-1));
  793: #else
  794: d2 = d1>>1;
  795: #endif
  796: :
  797:  dup 1 and >r 2/ swap 2/ [ 1 8 cells 1- lshift 1- ] Literal and
  798:  r> IF  [ 1 8 cells 1- lshift ] Literal + THEN  swap ;
  799: 
  800: and	w1 w2 -- w		core
  801: w = w1&w2;
  802: 
  803: or	w1 w2 -- w		core
  804: w = w1|w2;
  805: :
  806:  invert swap invert and invert ;
  807: 
  808: xor	w1 w2 -- w		core	x_or
  809: w = w1^w2;
  810: 
  811: invert	w1 -- w2		core
  812: w2 = ~w1;
  813: :
  814:  MAXU xor ;
  815: 
  816: rshift	u1 n -- u2		core	r_shift
  817:   u2 = u1>>n;
  818: :
  819:     0 ?DO 2/ MAXI and LOOP ;
  820: 
  821: lshift	u1 n -- u2		core	l_shift
  822:   u2 = u1<<n;
  823: :
  824:     0 ?DO 2* LOOP ;
  825: 
  826: \ comparisons(prefix, args, prefix, arg1, arg2, wordsets...)
  827: define(comparisons,
  828: $1=	$2 -- f		$6	$3equals
  829: f = FLAG($4==$5);
  830: :
  831:     [ char $1x char 0 = [IF]
  832: 	] IF false ELSE true THEN [
  833:     [ELSE]
  834: 	] xor 0= [
  835:     [THEN] ] ;
  836: 
  837: $1<>	$2 -- f		$7	$3not_equals
  838: f = FLAG($4!=$5);
  839: :
  840:     [ char $1x char 0 = [IF]
  841: 	] IF true ELSE false THEN [
  842:     [ELSE]
  843: 	] xor 0<> [
  844:     [THEN] ] ;
  845: 
  846: $1<	$2 -- f		$8	$3less_than
  847: f = FLAG($4<$5);
  848: :
  849:     [ char $1x char 0 = [IF]
  850: 	] MINI and 0<> [
  851:     [ELSE] char $1x char u = [IF]
  852: 	]   2dup xor 0<  IF nip ELSE - THEN 0<  [
  853: 	[ELSE]
  854: 	    ] MINI xor >r MINI xor r> u< [
  855: 	[THEN]
  856:     [THEN] ] ;
  857: 
  858: $1>	$2 -- f		$9	$3greater_than
  859: f = FLAG($4>$5);
  860: :
  861:     [ char $1x char 0 = [IF] ] negate [ [ELSE] ] swap [ [THEN] ]
  862:     $1< ;
  863: 
  864: $1<=	$2 -- f		gforth	$3less_or_equal
  865: f = FLAG($4<=$5);
  866: :
  867:     $1> 0= ;
  868: 
  869: $1>=	$2 -- f		gforth	$3greater_or_equal
  870: f = FLAG($4>=$5);
  871: :
  872:     [ char $1x char 0 = [IF] ] negate [ [ELSE] ] swap [ [THEN] ]
  873:     $1<= ;
  874: 
  875: )
  876: 
  877: comparisons(0, n, zero_, n, 0, core, core-ext, core, core-ext)
  878: comparisons(, n1 n2, , n1, n2, core, core-ext, core, core)
  879: comparisons(u, u1 u2, u_, u1, u2, gforth, gforth, core, core-ext)
  880: 
  881: \ dcomparisons(prefix, args, prefix, arg1, arg2, wordsets...)
  882: define(dcomparisons,
  883: $1=	$2 -- f		$6	$3equals
  884: #ifdef BUGGY_LONG_LONG
  885: f = FLAG($4.lo==$5.lo && $4.hi==$5.hi);
  886: #else
  887: f = FLAG($4==$5);
  888: #endif
  889: 
  890: $1<>	$2 -- f		$7	$3not_equals
  891: #ifdef BUGGY_LONG_LONG
  892: f = FLAG($4.lo!=$5.lo || $4.hi!=$5.hi);
  893: #else
  894: f = FLAG($4!=$5);
  895: #endif
  896: 
  897: $1<	$2 -- f		$8	$3less_than
  898: #ifdef BUGGY_LONG_LONG
  899: f = FLAG($4.hi==$5.hi ? $4.lo<$5.lo : $4.hi<$5.hi);
  900: #else
  901: f = FLAG($4<$5);
  902: #endif
  903: 
  904: $1>	$2 -- f		$9	$3greater_than
  905: #ifdef BUGGY_LONG_LONG
  906: f = FLAG($4.hi==$5.hi ? $4.lo>$5.lo : $4.hi>$5.hi);
  907: #else
  908: f = FLAG($4>$5);
  909: #endif
  910: 
  911: $1<=	$2 -- f		gforth	$3less_or_equal
  912: #ifdef BUGGY_LONG_LONG
  913: f = FLAG($4.hi==$5.hi ? $4.lo<=$5.lo : $4.hi<=$5.hi);
  914: #else
  915: f = FLAG($4<=$5);
  916: #endif
  917: 
  918: $1>=	$2 -- f		gforth	$3greater_or_equal
  919: #ifdef BUGGY_LONG_LONG
  920: f = FLAG($4.hi==$5.hi ? $4.lo>=$5.lo : $4.hi>=$5.hi);
  921: #else
  922: f = FLAG($4>=$5);
  923: #endif
  924: 
  925: )
  926: 
  927: \+dcomps
  928: 
  929: dcomparisons(d, d1 d2, d_, d1, d2, double, gforth, double, gforth)
  930: dcomparisons(d0, d, d_zero_, d, DZERO, double, gforth, double, gforth)
  931: dcomparisons(du, ud1 ud2, d_u_, ud1, ud2, gforth, gforth, double-ext, gforth)
  932: 
  933: \+
  934: 
  935: within	u1 u2 u3 -- f		core-ext
  936: ""u2=<u1<u3 or: u3=<u2 and u1 is not in [u3,u2).  This works for
  937: unsigned and signed numbers (but not a mixture).  Another way to think
  938: about this word is to consider the numbers as a circle (wrapping
  939: around from @code{max-u} to 0 for unsigned, and from @code{max-n} to
  940: min-n for signed numbers); now consider the range from u2 towards
  941: increasing numbers up to and excluding u3 (giving an empty range if
  942: u2=u3; if u1 is in this range, @code{within} returns true.""
  943: f = FLAG(u1-u2 < u3-u2);
  944: :
  945:  over - >r - r> u< ;
  946: 
  947: sp@	-- a_addr		gforth		sp_fetch
  948: a_addr = sp+1;
  949: 
  950: sp!	a_addr --		gforth		sp_store
  951: sp = a_addr;
  952: /* works with and without TOS caching */
  953: 
  954: rp@	-- a_addr		gforth		rp_fetch
  955: a_addr = rp;
  956: 
  957: rp!	a_addr --		gforth		rp_store
  958: rp = a_addr;
  959: 
  960: \+floating
  961: 
  962: fp@	-- f_addr	gforth	fp_fetch
  963: f_addr = fp;
  964: 
  965: fp!	f_addr --	gforth	fp_store
  966: fp = f_addr;
  967: 
  968: \+
  969: 
  970: ;s	--		gforth	semis
  971: ""The primitive compiled by @code{EXIT}.""
  972: SET_IP((Xt *)(*rp++));
  973: 
  974: >r	w --		core	to_r
  975: *--rp = w;
  976: :
  977:  (>r) ;
  978: : (>r)  rp@ cell+ @ rp@ ! rp@ cell+ ! ;
  979: 
  980: r>	-- w		core	r_from
  981: w = *rp++;
  982: :
  983:  rp@ cell+ @ rp@ @ rp@ cell+ ! (rdrop) rp@ ! ;
  984: Create (rdrop) ' ;s A,
  985: 
  986: rdrop	--		gforth
  987: rp++;
  988: :
  989:  r> r> drop >r ;
  990: 
  991: 2>r	w1 w2 --	core-ext	two_to_r
  992: *--rp = w1;
  993: *--rp = w2;
  994: :
  995:  swap r> swap >r swap >r >r ;
  996: 
  997: 2r>	-- w1 w2	core-ext	two_r_from
  998: w2 = *rp++;
  999: w1 = *rp++;
 1000: :
 1001:  r> r> swap r> swap >r swap ;
 1002: 
 1003: 2r@	-- w1 w2	core-ext	two_r_fetch
 1004: w2 = rp[0];
 1005: w1 = rp[1];
 1006: :
 1007:  i' j ;
 1008: 
 1009: 2rdrop	--		gforth	two_r_drop
 1010: rp+=2;
 1011: :
 1012:  r> r> drop r> drop >r ;
 1013: 
 1014: over	w1 w2 -- w1 w2 w1		core
 1015: :
 1016:  sp@ cell+ @ ;
 1017: 
 1018: drop	w --		core
 1019: :
 1020:  IF THEN ;
 1021: 
 1022: swap	w1 w2 -- w2 w1		core
 1023: :
 1024:  >r (swap) ! r> (swap) @ ;
 1025: Variable (swap)
 1026: 
 1027: dup	w -- w w		core	dupe
 1028: :
 1029:  sp@ @ ;
 1030: 
 1031: rot	w1 w2 w3 -- w2 w3 w1	core	rote
 1032: :
 1033: [ defined? (swap) [IF] ]
 1034:     (swap) ! (rot) ! >r (rot) @ (swap) @ r> ;
 1035: Variable (rot)
 1036: [ELSE] ]
 1037:     >r swap r> swap ;
 1038: [THEN]
 1039: 
 1040: -rot	w1 w2 w3 -- w3 w1 w2	gforth	not_rote
 1041: :
 1042:  rot rot ;
 1043: 
 1044: nip	w1 w2 -- w2		core-ext
 1045: :
 1046:  swap drop ;
 1047: 
 1048: tuck	w1 w2 -- w2 w1 w2	core-ext
 1049: :
 1050:  swap over ;
 1051: 
 1052: ?dup	w -- w			core	question_dupe
 1053: if (w!=0) {
 1054:   IF_TOS(*sp-- = w;)
 1055: #ifndef USE_TOS
 1056:   *--sp = w;
 1057: #endif
 1058: }
 1059: :
 1060:  dup IF dup THEN ;
 1061: 
 1062: pick	u -- w			core-ext
 1063: w = sp[u+1];
 1064: :
 1065:  1+ cells sp@ + @ ;
 1066: 
 1067: 2drop	w1 w2 --		core	two_drop
 1068: :
 1069:  drop drop ;
 1070: 
 1071: 2dup	w1 w2 -- w1 w2 w1 w2	core	two_dupe
 1072: :
 1073:  over over ;
 1074: 
 1075: 2over	w1 w2 w3 w4 -- w1 w2 w3 w4 w1 w2	core	two_over
 1076: :
 1077:  3 pick 3 pick ;
 1078: 
 1079: 2swap	w1 w2 w3 w4 -- w3 w4 w1 w2	core	two_swap
 1080: :
 1081:  rot >r rot r> ;
 1082: 
 1083: 2rot	w1 w2 w3 w4 w5 w6 -- w3 w4 w5 w6 w1 w2	double-ext	two_rote
 1084: :
 1085:  >r >r 2swap r> r> 2swap ;
 1086: 
 1087: 2nip	w1 w2 w3 w4 -- w3 w4	gforth	two_nip
 1088: :
 1089:  2swap 2drop ;
 1090: 
 1091: 2tuck	w1 w2 w3 w4 -- w3 w4 w1 w2 w3 w4	gforth	two_tuck
 1092: :
 1093:  2swap 2over ;
 1094: 
 1095: \ toggle is high-level: 0.11/0.42%
 1096: 
 1097: @	a_addr -- w		core	fetch
 1098: "" Read from the cell at address @i{a-addr}, and return its contents, @i{w}.""
 1099: w = *a_addr;
 1100: 
 1101: !	w a_addr --		core	store
 1102: "" Write the value @i{w} to the cell at address @i{a-addr}.""
 1103: *a_addr = w;
 1104: 
 1105: +!	n a_addr --		core	plus_store
 1106: "" Add @i{n} to the value stored in the cell at address @i{a-addr}.""
 1107: *a_addr += n;
 1108: :
 1109:  tuck @ + swap ! ;
 1110: 
 1111: c@	c_addr -- c		core	c_fetch
 1112: "" Read from the char at address @i{c-addr}, and return its contents, @i{c}.""
 1113: c = *c_addr;
 1114: :
 1115: [ bigendian [IF] ]
 1116:     [ cell>bit 4 = [IF] ]
 1117: 	dup [ 0 cell - ] Literal and @ swap 1 and
 1118: 	IF  $FF and  ELSE  8>>  THEN  ;
 1119:     [ [ELSE] ]
 1120: 	dup [ cell 1- ] literal and
 1121: 	tuck - @ swap [ cell 1- ] literal xor
 1122:  	0 ?DO 8>> LOOP $FF and
 1123:     [ [THEN] ]
 1124: [ [ELSE] ]
 1125:     [ cell>bit 4 = [IF] ]
 1126: 	dup [ 0 cell - ] Literal and @ swap 1 and
 1127: 	IF  8>>  ELSE  $FF and  THEN
 1128:     [ [ELSE] ]
 1129: 	dup [ cell  1- ] literal and 
 1130: 	tuck - @ swap
 1131: 	0 ?DO 8>> LOOP 255 and
 1132:     [ [THEN] ]
 1133: [ [THEN] ]
 1134: ;
 1135: : 8>> 2/ 2/ 2/ 2/  2/ 2/ 2/ 2/ ;
 1136: 
 1137: c!	c c_addr --		core	c_store
 1138: "" Write the value @i{c} to the char at address @i{c-addr}.""
 1139: *c_addr = c;
 1140: :
 1141: [ bigendian [IF] ]
 1142:     [ cell>bit 4 = [IF] ]
 1143: 	tuck 1 and IF  $FF and  ELSE  8<<  THEN >r
 1144: 	dup -2 and @ over 1 and cells masks + @ and
 1145: 	r> or swap -2 and ! ;
 1146: 	Create masks $00FF , $FF00 ,
 1147:     [ELSE] ]
 1148: 	dup [ cell 1- ] literal and dup 
 1149: 	[ cell 1- ] literal xor >r
 1150: 	- dup @ $FF r@ 0 ?DO 8<< LOOP invert and
 1151: 	rot $FF and r> 0 ?DO 8<< LOOP or swap ! ;
 1152:     [THEN]
 1153: [ELSE] ]
 1154:     [ cell>bit 4 = [IF] ]
 1155: 	tuck 1 and IF  8<<  ELSE  $FF and  THEN >r
 1156: 	dup -2 and @ over 1 and cells masks + @ and
 1157: 	r> or swap -2 and ! ;
 1158: 	Create masks $FF00 , $00FF ,
 1159:     [ELSE] ]
 1160: 	dup [ cell 1- ] literal and dup >r
 1161: 	- dup @ $FF r@ 0 ?DO 8<< LOOP invert and
 1162: 	rot $FF and r> 0 ?DO 8<< LOOP or swap ! ;
 1163:     [THEN]
 1164: [THEN]
 1165: : 8<< 2* 2* 2* 2*  2* 2* 2* 2* ;
 1166: 
 1167: 2!	w1 w2 a_addr --		core	two_store
 1168: "" Write the value @i{w1, w2} to the double at address @i{a-addr}.""
 1169: a_addr[0] = w2;
 1170: a_addr[1] = w1;
 1171: :
 1172:  tuck ! cell+ ! ;
 1173: 
 1174: 2@	a_addr -- w1 w2		core	two_fetch
 1175: "" Read from the double at address @i{a-addr}, and return its contents, @i{w1, w2}.""
 1176: w2 = a_addr[0];
 1177: w1 = a_addr[1];
 1178: :
 1179:  dup cell+ @ swap @ ;
 1180: 
 1181: cell+	a_addr1 -- a_addr2	core	cell_plus
 1182: "" Increment @i{a-addr1} by the number of address units corresponding to the size of
 1183: one cell, to give @i{a-addr2}.""
 1184: a_addr2 = a_addr1+1;
 1185: :
 1186:  cell + ;
 1187: 
 1188: cells	n1 -- n2		core
 1189: "" @i{n2} is the number of address units corresponding to @i{n1} cells.""
 1190: n2 = n1 * sizeof(Cell);
 1191: :
 1192:  [ cell
 1193:  2/ dup [IF] ] 2* [ [THEN]
 1194:  2/ dup [IF] ] 2* [ [THEN]
 1195:  2/ dup [IF] ] 2* [ [THEN]
 1196:  2/ dup [IF] ] 2* [ [THEN]
 1197:  drop ] ;
 1198: 
 1199: char+	c_addr1 -- c_addr2	core	char_plus
 1200: "" Increment @i{c-addr1} by the number of address units corresponding to the size of
 1201: one char, to give @i{c-addr2}.""
 1202: c_addr2 = c_addr1 + 1;
 1203: :
 1204:  1+ ;
 1205: 
 1206: (chars)		n1 -- n2	gforth	paren_chars
 1207: n2 = n1 * sizeof(Char);
 1208: :
 1209:  ;
 1210: 
 1211: count	c_addr1 -- c_addr2 u	core
 1212: "" If @i{c-add1} is the address of a counted string return the length of
 1213: the string, @i{u}, and the address of its first character, @i{c-addr2}.""
 1214: u = *c_addr1;
 1215: c_addr2 = c_addr1+1;
 1216: :
 1217:  dup 1+ swap c@ ;
 1218: 
 1219: (f83find)	c_addr u f83name1 -- f83name2	new	paren_f83find
 1220: for (; f83name1 != NULL; f83name1 = (struct F83Name *)(f83name1->next))
 1221:   if ((UCell)F83NAME_COUNT(f83name1)==u &&
 1222:       memcasecmp(c_addr, f83name1->name, u)== 0 /* or inline? */)
 1223:     break;
 1224: f83name2=f83name1;
 1225: :
 1226:     BEGIN  dup WHILE  (find-samelen)  dup  WHILE
 1227: 	>r 2dup r@ cell+ char+ capscomp  0=
 1228: 	IF  2drop r>  EXIT  THEN
 1229: 	r> @
 1230:     REPEAT  THEN  nip nip ;
 1231: : (find-samelen) ( u f83name1 -- u f83name2/0 )
 1232:     BEGIN  2dup cell+ c@ $1F and <> WHILE  @  dup 0= UNTIL  THEN ;
 1233: 
 1234: \+hash
 1235: 
 1236: (hashfind)	c_addr u a_addr -- f83name2	new	paren_hashfind
 1237: struct F83Name *f83name1;
 1238: f83name2=NULL;
 1239: while(a_addr != NULL)
 1240: {
 1241:    f83name1=(struct F83Name *)(a_addr[1]);
 1242:    a_addr=(Cell *)(a_addr[0]);
 1243:    if ((UCell)F83NAME_COUNT(f83name1)==u &&
 1244:        memcasecmp(c_addr, f83name1->name, u)== 0 /* or inline? */)
 1245:      {
 1246: 	f83name2=f83name1;
 1247: 	break;
 1248:      }
 1249: }
 1250: :
 1251:  BEGIN  dup  WHILE
 1252:         2@ >r >r dup r@ cell+ c@ $1F and =
 1253:         IF  2dup r@ cell+ char+ capscomp 0=
 1254: 	    IF  2drop r> rdrop  EXIT  THEN  THEN
 1255: 	rdrop r>
 1256:  REPEAT nip nip ;
 1257: 
 1258: (tablefind)	c_addr u a_addr -- f83name2	new	paren_tablefind
 1259: ""A case-sensitive variant of @code{(hashfind)}""
 1260: struct F83Name *f83name1;
 1261: f83name2=NULL;
 1262: while(a_addr != NULL)
 1263: {
 1264:    f83name1=(struct F83Name *)(a_addr[1]);
 1265:    a_addr=(Cell *)(a_addr[0]);
 1266:    if ((UCell)F83NAME_COUNT(f83name1)==u &&
 1267:        memcmp(c_addr, f83name1->name, u)== 0 /* or inline? */)
 1268:      {
 1269: 	f83name2=f83name1;
 1270: 	break;
 1271:      }
 1272: }
 1273: :
 1274:  BEGIN  dup  WHILE
 1275:         2@ >r >r dup r@ cell+ c@ $1F and =
 1276:         IF  2dup r@ cell+ char+ -text 0=
 1277: 	    IF  2drop r> rdrop  EXIT  THEN  THEN
 1278: 	rdrop r>
 1279:  REPEAT nip nip ;
 1280: 
 1281: (hashkey)	c_addr u1 -- u2		gforth	paren_hashkey
 1282: u2=0;
 1283: while(u1--)
 1284:    u2+=(Cell)toupper(*c_addr++);
 1285: :
 1286:  0 -rot bounds ?DO  I c@ toupper +  LOOP ;
 1287: 
 1288: (hashkey1)	c_addr u ubits -- ukey		gforth	paren_hashkey1
 1289: ""ukey is the hash key for the string c_addr u fitting in ubits bits""
 1290: /* this hash function rotates the key at every step by rot bits within
 1291:    ubits bits and xors it with the character. This function does ok in
 1292:    the chi-sqare-test.  Rot should be <=7 (preferably <=5) for
 1293:    ASCII strings (larger if ubits is large), and should share no
 1294:    divisors with ubits.
 1295: */
 1296: unsigned rot = ((char []){5,0,1,2,3,4,5,5,5,5,3,5,5,5,5,7,5,5,5,5,7,5,5,5,5,6,5,5,5,5,7,5,5})[ubits];
 1297: Char *cp = c_addr;
 1298: for (ukey=0; cp<c_addr+u; cp++)
 1299:     ukey = ((((ukey<<rot) | (ukey>>(ubits-rot))) 
 1300: 	     ^ toupper(*cp))
 1301: 	    & ((1<<ubits)-1));
 1302: :
 1303:  dup rot-values + c@ over 1 swap lshift 1- >r
 1304:  tuck - 2swap r> 0 2swap bounds
 1305:  ?DO  dup 4 pick lshift swap 3 pick rshift or
 1306:       I c@ toupper xor
 1307:       over and  LOOP
 1308:  nip nip nip ;
 1309: Create rot-values
 1310:   5 c, 0 c, 1 c, 2 c, 3 c,  4 c, 5 c, 5 c, 5 c, 5 c,
 1311:   3 c, 5 c, 5 c, 5 c, 5 c,  7 c, 5 c, 5 c, 5 c, 5 c,
 1312:   7 c, 5 c, 5 c, 5 c, 5 c,  6 c, 5 c, 5 c, 5 c, 5 c,
 1313:   7 c, 5 c, 5 c,
 1314: 
 1315: \+
 1316: 
 1317: (parse-white)	c_addr1 u1 -- c_addr2 u2	gforth	paren_parse_white
 1318: /* use !isgraph instead of isspace? */
 1319: Char *endp = c_addr1+u1;
 1320: while (c_addr1<endp && isspace(*c_addr1))
 1321:   c_addr1++;
 1322: if (c_addr1<endp) {
 1323:   for (c_addr2 = c_addr1; c_addr1<endp && !isspace(*c_addr1); c_addr1++)
 1324:     ;
 1325:   u2 = c_addr1-c_addr2;
 1326: }
 1327: else {
 1328:   c_addr2 = c_addr1;
 1329:   u2 = 0;
 1330: }
 1331: :
 1332:  BEGIN  dup  WHILE  over c@ bl <=  WHILE  1 /string
 1333:  REPEAT  THEN  2dup
 1334:  BEGIN  dup  WHILE  over c@ bl >   WHILE  1 /string
 1335:  REPEAT  THEN  nip - ;
 1336: 
 1337: aligned		c_addr -- a_addr	core
 1338: "" @i{a-addr} is the first aligned address greater than or equal to @i{c-addr}.""
 1339: a_addr = (Cell *)((((Cell)c_addr)+(sizeof(Cell)-1))&(-sizeof(Cell)));
 1340: :
 1341:  [ cell 1- ] Literal + [ -1 cells ] Literal and ;
 1342: 
 1343: faligned	c_addr -- f_addr	float	f_aligned
 1344: "" @i{f-addr} is the first float-aligned address greater than or equal to @i{c-addr}.""
 1345: f_addr = (Float *)((((Cell)c_addr)+(sizeof(Float)-1))&(-sizeof(Float)));
 1346: :
 1347:  [ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;
 1348: 
 1349: >body		xt -- a_addr	core	to_body
 1350: "" Get the address of the body of the word represented by @i{xt} (the address
 1351: of the word's data field).""
 1352: a_addr = PFA(xt);
 1353: :
 1354:     2 cells + ;
 1355: 
 1356: \ threading stuff is currently only interesting if we have a compiler
 1357: \fhas? standardthreading has? compiler and [IF]
 1358: 
 1359: >code-address		xt -- c_addr		gforth	to_code_address
 1360: ""@i{c-addr} is the code address of the word @i{xt}.""
 1361: /* !! This behaves installation-dependently for DOES-words */
 1362: c_addr = (Address)CODE_ADDRESS(xt);
 1363: :
 1364:     @ ;
 1365: 
 1366: >does-code	xt -- a_addr		gforth	to_does_code
 1367: ""If @i{xt} is the execution token of a defining-word-defined word,
 1368: @i{a-addr} is the start of the Forth code after the @code{DOES>};
 1369: Otherwise @i{a-addr} is 0.""
 1370: a_addr = (Cell *)DOES_CODE(xt);
 1371: :
 1372:     cell+ @ ;
 1373: 
 1374: code-address!		c_addr xt --		gforth	code_address_store
 1375: ""Create a code field with code address @i{c-addr} at @i{xt}.""
 1376: MAKE_CF(xt, c_addr);
 1377: CACHE_FLUSH(xt,(size_t)PFA(0));
 1378: :
 1379:     ! ;
 1380: 
 1381: does-code!	a_addr xt --		gforth	does_code_store
 1382: ""Create a code field at @i{xt} for a defining-word-defined word; @i{a-addr}
 1383: is the start of the Forth code after @code{DOES>}.""
 1384: MAKE_DOES_CF(xt, a_addr);
 1385: CACHE_FLUSH(xt,(size_t)PFA(0));
 1386: :
 1387:     dodoes: over ! cell+ ! ;
 1388: 
 1389: does-handler!	a_addr --	gforth	does_handler_store
 1390: ""Create a @code{DOES>}-handler at address @i{a-addr}. Usually, @i{a-addr} points
 1391: just behind a @code{DOES>}.""
 1392: MAKE_DOES_HANDLER(a_addr);
 1393: CACHE_FLUSH((caddr_t)a_addr,DOES_HANDLER_SIZE);
 1394: :
 1395:     drop ;
 1396: 
 1397: /does-handler	-- n	gforth	slash_does_handler
 1398: ""The size of a @code{DOES>}-handler (includes possible padding).""
 1399: /* !! a constant or environmental query might be better */
 1400: n = DOES_HANDLER_SIZE;
 1401: :
 1402:     2 cells ;
 1403: 
 1404: threading-method	-- n	gforth	threading_method
 1405: ""0 if the engine is direct threaded. Note that this may change during
 1406: the lifetime of an image.""
 1407: #if defined(DOUBLY_INDIRECT)
 1408: n=2;
 1409: #else
 1410: # if defined(DIRECT_THREADED)
 1411: n=0;
 1412: # else
 1413: n=1;
 1414: # endif
 1415: #endif
 1416: :
 1417:  1 ;
 1418: 
 1419: \f[THEN]
 1420: 
 1421: key-file	wfileid -- n		gforth	paren_key_file
 1422: #ifdef HAS_FILE
 1423: fflush(stdout);
 1424: n = key((FILE*)wfileid);
 1425: #else
 1426: n = key(stdin);
 1427: #endif
 1428: 
 1429: key?-file	wfileid -- n		facility	key_q_file
 1430: #ifdef HAS_FILE
 1431: fflush(stdout);
 1432: n = key_query((FILE*)wfileid);
 1433: #else
 1434: n = key_query(stdin);
 1435: #endif
 1436: 
 1437: \+os
 1438: 
 1439: stdin	-- wfileid	gforth
 1440: wfileid = (Cell)stdin;
 1441: 
 1442: stdout	-- wfileid	gforth
 1443: wfileid = (Cell)stdout;
 1444: 
 1445: stderr	-- wfileid	gforth
 1446: wfileid = (Cell)stderr;
 1447: 
 1448: form	-- urows ucols	gforth
 1449: ""The number of lines and columns in the terminal. These numbers may change
 1450: with the window size.""
 1451: /* we could block SIGWINCH here to get a consistent size, but I don't
 1452:  think this is necessary or always beneficial */
 1453: urows=rows;
 1454: ucols=cols;
 1455: 
 1456: flush-icache	c_addr u --	gforth	flush_icache
 1457: ""Make sure that the instruction cache of the processor (if there is
 1458: one) does not contain stale data at @i{c-addr} and @i{u} bytes
 1459: afterwards. @code{END-CODE} performs a @code{flush-icache}
 1460: automatically. Caveat: @code{flush-icache} might not work on your
 1461: installation; this is usually the case if direct threading is not
 1462: supported on your machine (take a look at your @file{machine.h}) and
 1463: your machine has a separate instruction cache. In such cases,
 1464: @code{flush-icache} does nothing instead of flushing the instruction
 1465: cache.""
 1466: FLUSH_ICACHE(c_addr,u);
 1467: 
 1468: (bye)	n --	gforth	paren_bye
 1469: return (Label *)n;
 1470: 
 1471: (system)	c_addr u -- wretval wior	gforth	peren_system
 1472: #ifndef MSDOS
 1473: int old_tp=terminal_prepped;
 1474: deprep_terminal();
 1475: #endif
 1476: wretval=system(cstr(c_addr,u,1)); /* ~ expansion on first part of string? */
 1477: wior = IOR(wretval==-1 || (wretval==127 && errno != 0));
 1478: #ifndef MSDOS
 1479: if (old_tp)
 1480:   prep_terminal();
 1481: #endif
 1482: 
 1483: getenv	c_addr1 u1 -- c_addr2 u2	gforth
 1484: ""The string @i{c-addr1 u1} specifies an environment variable. The string @i{c-addr2 u2}
 1485: is the host operating system's expansion of that environment variable. If the
 1486: environment variable does not exist, @i{c-addr2 u2} specifies a string 0 characters
 1487: in length.""
 1488: /* close ' to keep fontify happy */
 1489: c_addr2 = getenv(cstr(c_addr1,u1,1));
 1490: u2 = (c_addr2 == NULL ? 0 : strlen(c_addr2));
 1491: 
 1492: open-pipe	c_addr u ntype -- wfileid wior	gforth	open_pipe
 1493: wfileid=(Cell)popen(cstr(c_addr,u,1),fileattr[ntype]); /* ~ expansion of 1st arg? */
 1494: wior = IOR(wfileid==0); /* !! the man page says that errno is not set reliably */
 1495: 
 1496: close-pipe	wfileid -- wretval wior		gforth	close_pipe
 1497: wretval = pclose((FILE *)wfileid);
 1498: wior = IOR(wretval==-1);
 1499: 
 1500: time&date	-- nsec nmin nhour nday nmonth nyear	facility-ext	time_and_date
 1501: ""Report the current time of day. Seconds, minutes and hours are numbered from 0.
 1502: Months are numbered from 1.""
 1503: struct timeval time1;
 1504: struct timezone zone1;
 1505: struct tm *ltime;
 1506: gettimeofday(&time1,&zone1);
 1507: ltime=localtime((time_t *)&time1.tv_sec);
 1508: nyear =ltime->tm_year+1900;
 1509: nmonth=ltime->tm_mon+1;
 1510: nday  =ltime->tm_mday;
 1511: nhour =ltime->tm_hour;
 1512: nmin  =ltime->tm_min;
 1513: nsec  =ltime->tm_sec;
 1514: 
 1515: ms	n --	facility-ext
 1516: ""Wait at least @i{n} milli-second.""
 1517: struct timeval timeout;
 1518: timeout.tv_sec=n/1000;
 1519: timeout.tv_usec=1000*(n%1000);
 1520: (void)select(0,0,0,0,&timeout);
 1521: 
 1522: allocate	u -- a_addr wior	memory
 1523: ""Allocate @i{u} address units of contiguous data space. The initial
 1524: contents of the data space is undefined. If the allocation is successful,
 1525: @i{a-addr} is the start address of the allocated region and @i{wior}
 1526: is 0. If the allocation fails, @i{a-addr} is undefined and @i{wior}
 1527: is an implementation-defined I/O result code.""
 1528: a_addr = (Cell *)malloc(u?u:1);
 1529: wior = IOR(a_addr==NULL);
 1530: 
 1531: free		a_addr -- wior		memory
 1532: ""Return the region of data space starting at @i{a-addr} to the system.
 1533: The regon must originally have been obtained using @code{allocate} or
 1534: @code{resize}. If the operational is successful, @i{wior} is 0.
 1535: If the operation fails, @i{wior} is an implementation-defined
 1536: I/O result code.""
 1537: free(a_addr);
 1538: wior = 0;
 1539: 
 1540: resize		a_addr1 u -- a_addr2 wior	memory
 1541: ""Change the size of the allocated area at @i{a-addr1} to @i{u}
 1542: address units, possibly moving the contents to a different
 1543: area. @i{a-addr2} is the address of the resulting area.
 1544: If the operational is successful, @i{wior} is 0.
 1545: If the operation fails, @i{wior} is an implementation-defined
 1546: I/O result code. If @i{a-addr1} is 0, Gforth's (but not the Standard)
 1547: @code{resize} @code{allocate}s @i{u} address units.""
 1548: /* the following check is not necessary on most OSs, but it is needed
 1549:    on SunOS 4.1.2. */
 1550: /* close ' to keep fontify happy */
 1551: if (a_addr1==NULL)
 1552:   a_addr2 = (Cell *)malloc(u);
 1553: else
 1554:   a_addr2 = (Cell *)realloc(a_addr1, u);
 1555: wior = IOR(a_addr2==NULL);	/* !! Define a return code */
 1556: 
 1557: strerror	n -- c_addr u	gforth
 1558: c_addr = strerror(n);
 1559: u = strlen(c_addr);
 1560: 
 1561: strsignal	n -- c_addr u	gforth
 1562: c_addr = strsignal(n);
 1563: u = strlen(c_addr);
 1564: 
 1565: call-c	w --	gforth	call_c
 1566: ""Call the C function pointed to by @i{w}. The C function has to
 1567: access the stack itself. The stack pointers are exported in the global
 1568: variables @code{SP} and @code{FP}.""
 1569: /* This is a first attempt at support for calls to C. This may change in
 1570:    the future */
 1571: IF_FTOS(fp[0]=FTOS);
 1572: FP=fp;
 1573: SP=sp;
 1574: ((void (*)())w)();
 1575: sp=SP;
 1576: fp=FP;
 1577: IF_TOS(TOS=sp[0]);
 1578: IF_FTOS(FTOS=fp[0]);
 1579: 
 1580: \+
 1581: \+file
 1582: 
 1583: close-file	wfileid -- wior		file	close_file
 1584: wior = IOR(fclose((FILE *)wfileid)==EOF);
 1585: 
 1586: open-file	c_addr u ntype -- wfileid wior	file	open_file
 1587: wfileid = (Cell)fopen(tilde_cstr(c_addr, u, 1), fileattr[ntype]);
 1588: #if defined(GO32) && defined(MSDOS)
 1589: if(wfileid && !(ntype & 1))
 1590:   setbuf((FILE*)wfileid, NULL);
 1591: #endif
 1592: wior =  IOR(wfileid == 0);
 1593: 
 1594: create-file	c_addr u ntype -- wfileid wior	file	create_file
 1595: Cell	fd;
 1596: fd = open(tilde_cstr(c_addr, u, 1), O_CREAT|O_TRUNC|ufileattr[ntype], 0666);
 1597: if (fd != -1) {
 1598:   wfileid = (Cell)fdopen(fd, fileattr[ntype]);
 1599: #if defined(GO32) && defined(MSDOS)
 1600:   if(wfileid && !(ntype & 1))
 1601:     setbuf((FILE*)wfileid, NULL);
 1602: #endif
 1603:   wior = IOR(wfileid == 0);
 1604: } else {
 1605:   wfileid = 0;
 1606:   wior = IOR(1);
 1607: }
 1608: 
 1609: delete-file	c_addr u -- wior		file	delete_file
 1610: wior = IOR(unlink(tilde_cstr(c_addr, u, 1))==-1);
 1611: 
 1612: rename-file	c_addr1 u1 c_addr2 u2 -- wior	file-ext	rename_file
 1613: ""Rename file @i{c_addr1 u1} to new name @i{c_addr2 u2}""
 1614: char *s1=tilde_cstr(c_addr2, u2, 1);
 1615: wior = IOR(rename(tilde_cstr(c_addr1, u1, 0), s1)==-1);
 1616: 
 1617: file-position	wfileid -- ud wior	file	file_position
 1618: /* !! use tell and lseek? */
 1619: ud = LONG2UD(ftell((FILE *)wfileid));
 1620: wior = IOR(UD2LONG(ud)==-1);
 1621: 
 1622: reposition-file	ud wfileid -- wior	file	reposition_file
 1623: wior = IOR(fseek((FILE *)wfileid, UD2LONG(ud), SEEK_SET)==-1);
 1624: 
 1625: file-size	wfileid -- ud wior	file	file_size
 1626: struct stat buf;
 1627: wior = IOR(fstat(fileno((FILE *)wfileid), &buf)==-1);
 1628: ud = LONG2UD(buf.st_size);
 1629: 
 1630: resize-file	ud wfileid -- wior	file	resize_file
 1631: wior = IOR(ftruncate(fileno((FILE *)wfileid), UD2LONG(ud))==-1);
 1632: 
 1633: read-file	c_addr u1 wfileid -- u2 wior	file	read_file
 1634: /* !! fread does not guarantee enough */
 1635: u2 = fread(c_addr, sizeof(Char), u1, (FILE *)wfileid);
 1636: wior = FILEIO(u2<u1 && ferror((FILE *)wfileid));
 1637: /* !! is the value of ferror errno-compatible? */
 1638: if (wior)
 1639:   clearerr((FILE *)wfileid);
 1640: 
 1641: read-line	c_addr u1 wfileid -- u2 flag wior	file	read_line
 1642: #if 1
 1643: Cell c;
 1644: flag=-1;
 1645: for(u2=0; u2<u1; u2++)
 1646: {
 1647:    c = getc((FILE *)wfileid);
 1648:    if (c=='\n') break;
 1649:    if (c=='\r') {
 1650:      if ((c = getc((FILE *)wfileid))!='\n')
 1651:        ungetc(c,(FILE *)wfileid);
 1652:      break;
 1653:    }
 1654:    if (c==EOF) {
 1655: 	flag=FLAG(u2!=0);
 1656: 	break;
 1657:      }
 1658:    c_addr[u2] = (Char)c;
 1659: }
 1660: wior=FILEIO(ferror((FILE *)wfileid));
 1661: #else
 1662: if ((flag=FLAG(!feof((FILE *)wfileid) &&
 1663: 	       fgets(c_addr,u1+1,(FILE *)wfileid) != NULL))) {
 1664:   wior=FILEIO(ferror((FILE *)wfileid)!=0); /* !! ior? */
 1665:   if (wior)
 1666:     clearerr((FILE *)wfileid);
 1667:   u2 = strlen(c_addr);
 1668:   u2-=((u2>0) && (c_addr[u2-1]==NEWLINE));
 1669: }
 1670: else {
 1671:   wior=0;
 1672:   u2=0;
 1673: }
 1674: #endif
 1675: 
 1676: \+
 1677: 
 1678: write-file	c_addr u1 wfileid -- wior	file	write_file
 1679: /* !! fwrite does not guarantee enough */
 1680: #ifdef HAS_FILE
 1681: {
 1682:   UCell u2 = fwrite(c_addr, sizeof(Char), u1, (FILE *)wfileid);
 1683:   wior = FILEIO(u2<u1 && ferror((FILE *)wfileid));
 1684:   if (wior)
 1685:     clearerr((FILE *)wfileid);
 1686: }
 1687: #else
 1688: TYPE(c_addr, u1);
 1689: #endif
 1690: 
 1691: emit-file	c wfileid -- wior	gforth	emit_file
 1692: #ifdef HAS_FILE
 1693: wior = FILEIO(putc(c, (FILE *)wfileid)==EOF);
 1694: if (wior)
 1695:   clearerr((FILE *)wfileid);
 1696: #else
 1697: PUTC(c);
 1698: #endif
 1699: 
 1700: \+file
 1701: 
 1702: flush-file	wfileid -- wior		file-ext	flush_file
 1703: wior = IOR(fflush((FILE *) wfileid)==EOF);
 1704: 
 1705: file-status	c_addr u -- ntype wior	file-ext	file_status
 1706: char *filename=tilde_cstr(c_addr, u, 1);
 1707: if (access (filename, F_OK) != 0) {
 1708:   ntype=0;
 1709:   wior=IOR(1);
 1710: }
 1711: else if (access (filename, R_OK | W_OK) == 0) {
 1712:   ntype=2; /* r/w */
 1713:   wior=0;
 1714: }
 1715: else if (access (filename, R_OK) == 0) {
 1716:   ntype=0; /* r/o */
 1717:   wior=0;
 1718: }
 1719: else if (access (filename, W_OK) == 0) {
 1720:   ntype=4; /* w/o */
 1721:   wior=0;
 1722: }
 1723: else {
 1724:   ntype=1; /* well, we cannot access the file, but better deliver a legal
 1725: 	    access mode (r/o bin), so we get a decent error later upon open. */
 1726:   wior=0;
 1727: }
 1728: 
 1729: \+
 1730: \+floating
 1731: 
 1732: comparisons(f, r1 r2, f_, r1, r2, gforth, gforth, float, gforth)
 1733: comparisons(f0, r, f_zero_, r, 0., float, gforth, float, gforth)
 1734: 
 1735: d>f		d -- r		float	d_to_f
 1736: #ifdef BUGGY_LONG_LONG
 1737: extern double ldexp(double x, int exp);
 1738: r = ldexp((Float)d.hi,CELL_BITS) + (Float)d.lo;
 1739: #else
 1740: r = d;
 1741: #endif
 1742: 
 1743: f>d		r -- d		float	f_to_d
 1744: #ifdef BUGGY_LONG_LONG
 1745: d.hi = ldexp(r,-(int)(CELL_BITS)) - (r<0);
 1746: d.lo = r-ldexp((Float)d.hi,CELL_BITS);
 1747: #else
 1748: d = r;
 1749: #endif
 1750: 
 1751: f!		r f_addr --	float	f_store
 1752: "" Store the floating-point value @i{r} to address @i{f-addr}.""
 1753: *f_addr = r;
 1754: 
 1755: f@		f_addr -- r	float	f_fetch
 1756: "" Fetch floating-point value @i{r} from address @i{f-addr}.""
 1757: r = *f_addr;
 1758: 
 1759: df@		df_addr -- r	float-ext	d_f_fetch
 1760: "" Fetch the double-precision IEEE floating-point value @i{r} from the address @i{df-addr}.""
 1761: #ifdef IEEE_FP
 1762: r = *df_addr;
 1763: #else
 1764: !! df@
 1765: #endif
 1766: 
 1767: df!		r df_addr --	float-ext	d_f_store
 1768: "" Store the double-precision IEEE floating-point value @i{r} to the address @i{df-addr}.""
 1769: #ifdef IEEE_FP
 1770: *df_addr = r;
 1771: #else
 1772: !! df!
 1773: #endif
 1774: 
 1775: sf@		sf_addr -- r	float-ext	s_f_fetch
 1776: "" Fetch the single-precision IEEE floating-point value @i{r} from the address @i{sf-addr}.""
 1777: #ifdef IEEE_FP
 1778: r = *sf_addr;
 1779: #else
 1780: !! sf@
 1781: #endif
 1782: 
 1783: sf!		r sf_addr --	float-ext	s_f_store
 1784: "" Store the single-precision IEEE floating-point value @i{r} to the address @i{sf-addr}.""
 1785: #ifdef IEEE_FP
 1786: *sf_addr = r;
 1787: #else
 1788: !! sf!
 1789: #endif
 1790: 
 1791: f+		r1 r2 -- r3	float	f_plus
 1792: r3 = r1+r2;
 1793: 
 1794: f-		r1 r2 -- r3	float	f_minus
 1795: r3 = r1-r2;
 1796: 
 1797: f*		r1 r2 -- r3	float	f_star
 1798: r3 = r1*r2;
 1799: 
 1800: f/		r1 r2 -- r3	float	f_slash
 1801: r3 = r1/r2;
 1802: 
 1803: f**		r1 r2 -- r3	float-ext	f_star_star
 1804: ""@i{r3} is @i{r1} raised to the @i{r2}th power.""
 1805: r3 = pow(r1,r2);
 1806: 
 1807: fnegate		r1 -- r2	float	f_negate
 1808: r2 = - r1;
 1809: 
 1810: fdrop		r --		float	f_drop
 1811: 
 1812: fdup		r -- r r	float	f_dupe
 1813: 
 1814: fswap		r1 r2 -- r2 r1	float	f_swap
 1815: 
 1816: fover		r1 r2 -- r1 r2 r1	float	f_over
 1817: 
 1818: frot		r1 r2 r3 -- r2 r3 r1	float	f_rote
 1819: 
 1820: fnip		r1 r2 -- r2	gforth	f_nip
 1821: 
 1822: ftuck		r1 r2 -- r2 r1 r2	gforth	f_tuck
 1823: 
 1824: float+		f_addr1 -- f_addr2	float	float_plus
 1825: "" Increment @i{f-addr1} by the number of address units corresponding to the size of
 1826: one floating-point number, to give @i{f-addr2}.""
 1827: f_addr2 = f_addr1+1;
 1828: 
 1829: floats		n1 -- n2	float
 1830: ""@i{n2} is the number of address units corresponding to @i{n1} floating-point numbers.""
 1831: n2 = n1*sizeof(Float);
 1832: 
 1833: floor		r1 -- r2	float
 1834: ""Round towards the next smaller integral value, i.e., round toward negative infinity.""
 1835: /* !! unclear wording */
 1836: r2 = floor(r1);
 1837: 
 1838: fround		r1 -- r2	float	f_round
 1839: ""Round to the nearest integral value.""
 1840: /* !! unclear wording */
 1841: #ifdef HAVE_RINT
 1842: r2 = rint(r1);
 1843: #else
 1844: r2 = floor(r1+0.5);
 1845: /* !! This is not quite true to the rounding rules given in the standard */
 1846: #endif
 1847: 
 1848: fmax		r1 r2 -- r3	float	f_max
 1849: if (r1<r2)
 1850:   r3 = r2;
 1851: else
 1852:   r3 = r1;
 1853: 
 1854: fmin		r1 r2 -- r3	float	f_min
 1855: if (r1<r2)
 1856:   r3 = r1;
 1857: else
 1858:   r3 = r2;
 1859: 
 1860: represent		r c_addr u -- n f1 f2	float
 1861: char *sig;
 1862: int flag;
 1863: int decpt;
 1864: sig=ecvt(r, u, &decpt, &flag);
 1865: n=(r==0 ? 1 : decpt);
 1866: f1=FLAG(flag!=0);
 1867: f2=FLAG(isdigit((unsigned)(sig[0]))!=0);
 1868: memmove(c_addr,sig,u);
 1869: 
 1870: >float	c_addr u -- flag	float	to_float
 1871: ""Attempt to convert the character string @i{c-addr u} to
 1872: internal floating-point representation. If the string
 1873: represents a valid floating-point number @i{r} is placed
 1874: on the floating-point stack and @i{flag} is true. Otherwise,
 1875: @i{flag} is false. A string of blanks is a special case
 1876: and represents the floating-point number 0.""
 1877: /* real signature: c_addr u -- r t / f */
 1878: Float r;
 1879: char *number=cstr(c_addr, u, 1);
 1880: char *endconv;
 1881: int sign = 0;
 1882: if(number[0]=='-') {
 1883:    sign = 1;
 1884:    number++;
 1885:    u--;
 1886: }
 1887: while(isspace((unsigned)(number[--u])) && u>0);
 1888: switch(number[u])
 1889: {
 1890:    case 'd':
 1891:    case 'D':
 1892:    case 'e':
 1893:    case 'E':  break;
 1894:    default :  u++; break;
 1895: }
 1896: number[u]='\0';
 1897: r=strtod(number,&endconv);
 1898: if((flag=FLAG(!(Cell)*endconv)))
 1899: {
 1900:    IF_FTOS(fp[0] = FTOS);
 1901:    fp += -1;
 1902:    FTOS = sign ? -r : r;
 1903: }
 1904: else if(*endconv=='d' || *endconv=='D')
 1905: {
 1906:    *endconv='E';
 1907:    r=strtod(number,&endconv);
 1908:    if((flag=FLAG(!(Cell)*endconv)))
 1909:      {
 1910: 	IF_FTOS(fp[0] = FTOS);
 1911: 	fp += -1;
 1912: 	FTOS = sign ? -r : r;
 1913:      }
 1914: }
 1915: 
 1916: fabs		r1 -- r2	float-ext	f_abs
 1917: r2 = fabs(r1);
 1918: 
 1919: facos		r1 -- r2	float-ext	f_a_cos
 1920: r2 = acos(r1);
 1921: 
 1922: fasin		r1 -- r2	float-ext	f_a_sine
 1923: r2 = asin(r1);
 1924: 
 1925: fatan		r1 -- r2	float-ext	f_a_tan
 1926: r2 = atan(r1);
 1927: 
 1928: fatan2		r1 r2 -- r3	float-ext	f_a_tan_two
 1929: ""@i{r1/r2}=tan(@i{r3}). ANS Forth does not require, but probably
 1930: intends this to be the inverse of @code{fsincos}. In gforth it is.""
 1931: r3 = atan2(r1,r2);
 1932: 
 1933: fcos		r1 -- r2	float-ext	f_cos
 1934: r2 = cos(r1);
 1935: 
 1936: fexp		r1 -- r2	float-ext	f_e_x_p
 1937: r2 = exp(r1);
 1938: 
 1939: fexpm1		r1 -- r2	float-ext	f_e_x_p_m_one
 1940: ""@i{r2}=@i{e}**@i{r1}@minus{}1""
 1941: #ifdef HAVE_EXPM1
 1942: extern double
 1943: #ifdef NeXT
 1944:               const
 1945: #endif
 1946:                     expm1(double);
 1947: r2 = expm1(r1);
 1948: #else
 1949: r2 = exp(r1)-1.;
 1950: #endif
 1951: 
 1952: fln		r1 -- r2	float-ext	f_l_n
 1953: r2 = log(r1);
 1954: 
 1955: flnp1		r1 -- r2	float-ext	f_l_n_p_one
 1956: ""@i{r2}=ln(@i{r1}+1)""
 1957: #ifdef HAVE_LOG1P
 1958: extern double
 1959: #ifdef NeXT
 1960:               const
 1961: #endif
 1962:                     log1p(double);
 1963: r2 = log1p(r1);
 1964: #else
 1965: r2 = log(r1+1.);
 1966: #endif
 1967: 
 1968: flog		r1 -- r2	float-ext	f_log
 1969: ""The decimal logarithm.""
 1970: r2 = log10(r1);
 1971: 
 1972: falog		r1 -- r2	float-ext	f_a_log
 1973: ""@i{r2}=10**@i{r1}""
 1974: extern double pow10(double);
 1975: r2 = pow10(r1);
 1976: 
 1977: fsin		r1 -- r2	float-ext	f_sine
 1978: r2 = sin(r1);
 1979: 
 1980: fsincos		r1 -- r2 r3	float-ext	f_sine_cos
 1981: ""@i{r2}=sin(@i{r1}), @i{r3}=cos(@i{r1})""
 1982: r2 = sin(r1);
 1983: r3 = cos(r1);
 1984: 
 1985: fsqrt		r1 -- r2	float-ext	f_square_root
 1986: r2 = sqrt(r1);
 1987: 
 1988: ftan		r1 -- r2	float-ext	f_tan
 1989: r2 = tan(r1);
 1990: :
 1991:  fsincos f/ ;
 1992: 
 1993: fsinh		r1 -- r2	float-ext	f_cinch
 1994: r2 = sinh(r1);
 1995: :
 1996:  fexpm1 fdup fdup 1. d>f f+ f/ f+ f2/ ;
 1997: 
 1998: fcosh		r1 -- r2	float-ext	f_cosh
 1999: r2 = cosh(r1);
 2000: :
 2001:  fexp fdup 1/f f+ f2/ ;
 2002: 
 2003: ftanh		r1 -- r2	float-ext	f_tan_h
 2004: r2 = tanh(r1);
 2005: :
 2006:  f2* fexpm1 fdup 2. d>f f+ f/ ;
 2007: 
 2008: fasinh		r1 -- r2	float-ext	f_a_cinch
 2009: r2 = asinh(r1);
 2010: :
 2011:  fdup fdup f* 1. d>f f+ fsqrt f/ fatanh ;
 2012: 
 2013: facosh		r1 -- r2	float-ext	f_a_cosh
 2014: r2 = acosh(r1);
 2015: :
 2016:  fdup fdup f* 1. d>f f- fsqrt f+ fln ;
 2017: 
 2018: fatanh		r1 -- r2	float-ext	f_a_tan_h
 2019: r2 = atanh(r1);
 2020: :
 2021:  fdup f0< >r fabs 1. d>f fover f- f/  f2* flnp1 f2/
 2022:  r> IF  fnegate  THEN ;
 2023: 
 2024: sfloats		n1 -- n2	float-ext	s_floats
 2025: ""@i{n2} is the number of address units corresponding to @i{n1}
 2026: single-precision IEEE floating-point numbers.""
 2027: n2 = n1*sizeof(SFloat);
 2028: 
 2029: dfloats		n1 -- n2	float-ext	d_floats
 2030: ""@i{n2} is the number of address units corresponding to @i{n1}
 2031: double-precision IEEE floating-point numbers.""
 2032: n2 = n1*sizeof(DFloat);
 2033: 
 2034: sfaligned	c_addr -- sf_addr	float-ext	s_f_aligned
 2035: "" @i{sf-addr} is the first single-float-aligned address greater
 2036: than or equal to @i{c-addr}.""
 2037: sf_addr = (SFloat *)((((Cell)c_addr)+(sizeof(SFloat)-1))&(-sizeof(SFloat)));
 2038: :
 2039:  [ 1 sfloats 1- ] Literal + [ -1 sfloats ] Literal and ;
 2040: 
 2041: dfaligned	c_addr -- df_addr	float-ext	d_f_aligned
 2042: "" @i{df-addr} is the first double-float-aligned address greater
 2043: than or equal to @i{c-addr}.""
 2044: df_addr = (DFloat *)((((Cell)c_addr)+(sizeof(DFloat)-1))&(-sizeof(DFloat)));
 2045: :
 2046:  [ 1 dfloats 1- ] Literal + [ -1 dfloats ] Literal and ;
 2047: 
 2048: \ The following words access machine/OS/installation-dependent
 2049: \   Gforth internals
 2050: \ !! how about environmental queries DIRECT-THREADED,
 2051: \   INDIRECT-THREADED, TOS-CACHED, FTOS-CACHED, CODEFIELD-DOES */
 2052: 
 2053: \ local variable implementation primitives
 2054: \+
 2055: \+glocals
 2056: 
 2057: @local#		-- w	gforth	fetch_local_number
 2058: w = *(Cell *)(lp+(Cell)NEXT_INST);
 2059: INC_IP(1);
 2060: 
 2061: @local0	-- w	new	fetch_local_zero
 2062: w = *(Cell *)(lp+0*sizeof(Cell));
 2063: 
 2064: @local1	-- w	new	fetch_local_four
 2065: w = *(Cell *)(lp+1*sizeof(Cell));
 2066: 
 2067: @local2	-- w	new	fetch_local_eight
 2068: w = *(Cell *)(lp+2*sizeof(Cell));
 2069: 
 2070: @local3	-- w	new	fetch_local_twelve
 2071: w = *(Cell *)(lp+3*sizeof(Cell));
 2072: 
 2073: \+floating
 2074: 
 2075: f@local#	-- r	gforth	f_fetch_local_number
 2076: r = *(Float *)(lp+(Cell)NEXT_INST);
 2077: INC_IP(1);
 2078: 
 2079: f@local0	-- r	new	f_fetch_local_zero
 2080: r = *(Float *)(lp+0*sizeof(Float));
 2081: 
 2082: f@local1	-- r	new	f_fetch_local_eight
 2083: r = *(Float *)(lp+1*sizeof(Float));
 2084: 
 2085: \+
 2086: 
 2087: laddr#		-- c_addr	gforth	laddr_number
 2088: /* this can also be used to implement lp@ */
 2089: c_addr = (Char *)(lp+(Cell)NEXT_INST);
 2090: INC_IP(1);
 2091: 
 2092: lp+!#	--	gforth	lp_plus_store_number
 2093: ""used with negative immediate values it allocates memory on the
 2094: local stack, a positive immediate argument drops memory from the local
 2095: stack""
 2096: lp += (Cell)NEXT_INST;
 2097: INC_IP(1);
 2098: 
 2099: lp-	--	new	minus_four_lp_plus_store
 2100: lp += -sizeof(Cell);
 2101: 
 2102: lp+	--	new	eight_lp_plus_store
 2103: lp += sizeof(Float);
 2104: 
 2105: lp+2	--	new	sixteen_lp_plus_store
 2106: lp += 2*sizeof(Float);
 2107: 
 2108: lp!	c_addr --	gforth	lp_store
 2109: lp = (Address)c_addr;
 2110: 
 2111: >l	w --	gforth	to_l
 2112: lp -= sizeof(Cell);
 2113: *(Cell *)lp = w;
 2114: 
 2115: \+floating
 2116: 
 2117: f>l	r --	gforth	f_to_l
 2118: lp -= sizeof(Float);
 2119: *(Float *)lp = r;
 2120: 
 2121: fpick	u -- r		gforth
 2122: r = fp[u+1]; /* +1, because update of fp happens before this fragment */
 2123: :
 2124:  floats fp@ + f@ ;
 2125: 
 2126: \+
 2127: \+
 2128: 
 2129: \+OS
 2130: 
 2131: define(`uploop',
 2132:        `pushdef(`$1', `$2')_uploop(`$1', `$2', `$3', `$4', `$5')`'popdef(`$1')')
 2133: define(`_uploop',
 2134:        `ifelse($1, `$3', `$5',
 2135: 	       `$4`'define(`$1', incr($1))_uploop(`$1', `$2', `$3', `$4', `$5')')')
 2136: \ argflist(argnum): Forth argument list
 2137: define(argflist,
 2138:        `ifelse($1, 0, `',
 2139:                `uploop(`_i', 1, $1, `format(`u%d ', _i)', `format(`u%d ', _i)')')')
 2140: \ argdlist(argnum): declare C's arguments
 2141: define(argdlist,
 2142:        `ifelse($1, 0, `',
 2143:                `uploop(`_i', 1, $1, `Cell, ', `Cell')')')
 2144: \ argclist(argnum): pass C's arguments
 2145: define(argclist,
 2146:        `ifelse($1, 0, `',
 2147:                `uploop(`_i', 1, $1, `format(`u%d, ', _i)', `format(`u%d', _i)')')')
 2148: \ icall(argnum)
 2149: define(icall,
 2150: `icall$1	argflist($1)u -- uret	gforth
 2151: uret = (SYSCALL(Cell(*)(argdlist($1)))u)(argclist($1));
 2152: 
 2153: ')
 2154: define(fcall,
 2155: `fcall$1	argflist($1)u -- rret	gforth
 2156: rret = (SYSCALL(Float(*)(argdlist($1)))u)(argclist($1));
 2157: 
 2158: ')
 2159: 
 2160: \ close ' to keep fontify happy
 2161: 
 2162: open-lib	c_addr1 u1 -- u2	gforth	open_lib
 2163: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN)
 2164: #ifndef RTLD_GLOBAL
 2165: #define RTLD_GLOBAL 0
 2166: #endif
 2167: u2=(UCell) dlopen(cstr(c_addr1, u1, 1), RTLD_GLOBAL | RTLD_LAZY);
 2168: #else
 2169: #  ifdef _WIN32
 2170: u2 = (Cell) GetModuleHandle(cstr(c_addr1, u1, 1));
 2171: #  else
 2172: #warning Define open-lib!
 2173: u2 = 0;
 2174: #  endif
 2175: #endif
 2176: 
 2177: lib-sym	c_addr1 u1 u2 -- u3	gforth	lib_sym
 2178: #if defined(HAVE_LIBDL) || defined(HAVE_DLOPEN)
 2179: u3 = (UCell) dlsym((void*)u2,cstr(c_addr1, u1, 1));
 2180: #else
 2181: #  ifdef _WIN32
 2182: u3 = (Cell) GetProcAddress((HMODULE)u2, cstr(c_addr1, u1, 1));
 2183: #  else
 2184: #warning Define lib-sym!
 2185: u3 = 0;
 2186: #  endif
 2187: #endif
 2188: 
 2189: uploop(i, 0, 7, `icall(i)')
 2190: icall(20)
 2191: uploop(i, 0, 7, `fcall(i)')
 2192: fcall(20)
 2193: 
 2194: \+
 2195: 
 2196: up!	a_addr --	gforth	up_store
 2197: UP=up=(char *)a_addr;
 2198: :
 2199:  up ! ;
 2200: Variable UP
 2201: 
 2202: wcall	u --	gforth
 2203: IF_FTOS(fp[0]=FTOS);
 2204: FP=fp;
 2205: sp=(SYSCALL(Cell(*)(Cell *, void *))u)(sp, &FP);
 2206: fp=FP;
 2207: IF_TOS(TOS=sp[0];)
 2208: IF_FTOS(FTOS=fp[0]);
 2209: 
 2210: \+file
 2211: 
 2212: open-dir	c_addr u -- wdirid wior	gforth	open_dir
 2213: wdirid = (Cell)opendir(tilde_cstr(c_addr, u, 1));
 2214: wior =  IOR(wdirid == 0);
 2215: 
 2216: read-dir	c_addr u1 wdirid -- u2 flag wior	gforth	read_dir
 2217: struct dirent * dent;
 2218: dent = readdir((DIR *)wdirid);
 2219: wior = 0;
 2220: flag = -1;
 2221: if(dent == NULL) {
 2222:   u2 = 0;
 2223:   flag = 0;
 2224: } else {
 2225:   u2 = strlen(dent->d_name);
 2226:   if(u2 > u1)
 2227:     u2 = u1;
 2228:   memmove(c_addr, dent->d_name, u2);
 2229: }
 2230: 
 2231: close-dir	wdirid -- wior	gforth	close_dir
 2232: wior = IOR(closedir((DIR *)wdirid));
 2233: 
 2234: filename-match	c_addr1 u1 c_addr2 u2 -- flag	gforth	match_file
 2235: char * string = cstr(c_addr1, u1, 1);
 2236: char * pattern = cstr(c_addr2, u2, 0);
 2237: flag = FLAG(!fnmatch(pattern, string, 0));
 2238: 
 2239: \+
 2240: 
 2241: newline	-- c_addr u	gforth
 2242: ""String containing the newline sequence of the host OS""
 2243: char newline[] = {
 2244: #ifdef unix
 2245: '\n'
 2246: #else
 2247: '\r','\n'
 2248: #endif
 2249: };
 2250: c_addr=newline;
 2251: u=sizeof(newline);

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