Commit | Line | Data |
---|---|---|
a27f2922 | 1 | %{ |
3321b8ce | 2 | static char *sccsid = "@(#)bc.y 4.2 (Berkeley) 81/02/28"; |
a27f2922 BJ |
3 | int *getout(); |
4 | %} | |
5 | %right '=' | |
6 | %left '+' '-' | |
7 | %left '*' '/' '%' | |
8 | %right '^' | |
9 | %left UMINUS | |
10 | ||
11 | %term LETTER DIGIT SQRT LENGTH _IF FFF EQ | |
12 | %term _WHILE _FOR NE LE GE INCR DECR | |
13 | %term _RETURN _BREAK _DEFINE BASE OBASE SCALE | |
14 | %term EQPL EQMI EQMUL EQDIV EQREM EQEXP | |
15 | %term _AUTO DOT | |
16 | %term QSTR | |
17 | ||
18 | %{ | |
19 | #include <stdio.h> | |
20 | int in; | |
21 | char cary[1000], *cp = { cary }; | |
22 | char string[1000], *str = {string}; | |
23 | int crs = '0'; | |
24 | int rcrs = '0'; /* reset crs */ | |
25 | int bindx = 0; | |
26 | int lev = 0; | |
27 | int ln; | |
28 | char *ss; | |
29 | int bstack[10] = { 0 }; | |
30 | char *numb[15] = { | |
31 | " 0", " 1", " 2", " 3", " 4", " 5", | |
32 | " 6", " 7", " 8", " 9", " 10", " 11", | |
33 | " 12", " 13", " 14" }; | |
34 | int *pre, *post; | |
35 | %} | |
36 | %% | |
37 | start : | |
38 | | start stat tail | |
39 | = output( $2 ); | |
40 | | start def dargs ')' '{' dlist slist '}' | |
41 | ={ bundle( 6,pre, $7, post ,"0",numb[lev],"Q"); | |
42 | conout( $$, $2 ); | |
43 | rcrs = crs; | |
44 | output( "" ); | |
45 | lev = bindx = 0; | |
46 | } | |
47 | ; | |
48 | ||
49 | dlist : tail | |
50 | | dlist _AUTO dlets tail | |
51 | ; | |
52 | ||
53 | stat : e | |
54 | ={ bundle(2, $1, "ps." ); } | |
55 | | | |
56 | ={ bundle(1, "" ); } | |
57 | | QSTR | |
58 | ={ bundle(3,"[",$1,"]P");} | |
59 | | LETTER '=' e | |
60 | ={ bundle(3, $3, "s", $1 ); } | |
61 | | LETTER '[' e ']' '=' e | |
62 | ={ bundle(4, $6, $3, ":", geta($1)); } | |
63 | | LETTER EQOP e | |
64 | ={ bundle(6, "l", $1, $3, $2, "s", $1 ); } | |
65 | | LETTER '[' e ']' EQOP e | |
66 | ={ bundle(8,$3, ";", geta($1), $6, $5, $3, ":", geta($1));} | |
67 | | _BREAK | |
68 | ={ bundle(2, numb[lev-bstack[bindx-1]], "Q" ); } | |
69 | | _RETURN '(' e ')' | |
70 | = bundle(4, $3, post, numb[lev], "Q" ); | |
71 | | _RETURN '(' ')' | |
72 | = bundle(4, "0", post, numb[lev], "Q" ); | |
73 | | _RETURN | |
74 | = bundle(4,"0",post,numb[lev],"Q"); | |
75 | | SCALE '=' e | |
76 | = bundle(2, $3, "k"); | |
77 | | SCALE EQOP e | |
78 | = bundle(4,"K",$3,$2,"k"); | |
79 | | BASE '=' e | |
80 | = bundle(2,$3, "i"); | |
81 | | BASE EQOP e | |
82 | = bundle(4,"I",$3,$2,"i"); | |
83 | | OBASE '=' e | |
84 | = bundle(2,$3,"o"); | |
85 | | OBASE EQOP e | |
86 | = bundle(4,"O",$3,$2,"o"); | |
87 | | '{' slist '}' | |
88 | ={ $$ = $2; } | |
89 | | FFF | |
90 | ={ bundle(1,"fY"); } | |
91 | | error | |
92 | ={ bundle(1,"c"); } | |
93 | | _IF CRS BLEV '(' re ')' stat | |
94 | ={ conout( $7, $2 ); | |
95 | bundle(3, $5, $2, " " ); | |
96 | } | |
97 | | _WHILE CRS '(' re ')' stat BLEV | |
98 | ={ bundle(3, $6, $4, $2 ); | |
99 | conout( $$, $2 ); | |
100 | bundle(3, $4, $2, " " ); | |
101 | } | |
102 | | fprefix CRS re ';' e ')' stat BLEV | |
103 | ={ bundle(5, $7, $5, "s.", $3, $2 ); | |
104 | conout( $$, $2 ); | |
105 | bundle(5, $1, "s.", $3, $2, " " ); | |
106 | } | |
107 | | '~' LETTER '=' e | |
108 | ={ bundle(3,$4,"S",$2); } | |
109 | ; | |
110 | ||
111 | EQOP : EQPL | |
112 | ={ $$ = "+"; } | |
113 | | EQMI | |
114 | ={ $$ = "-"; } | |
115 | | EQMUL | |
116 | ={ $$ = "*"; } | |
117 | | EQDIV | |
118 | ={ $$ = "/"; } | |
119 | | EQREM | |
120 | ={ $$ = "%%"; } | |
121 | | EQEXP | |
122 | ={ $$ = "^"; } | |
123 | ; | |
124 | ||
125 | fprefix : _FOR '(' e ';' | |
126 | ={ $$ = $3; } | |
127 | ; | |
128 | ||
129 | BLEV : | |
130 | ={ --bindx; } | |
131 | ; | |
132 | ||
133 | slist : stat | |
134 | | slist tail stat | |
135 | ={ bundle(2, $1, $3 ); } | |
136 | ; | |
137 | ||
138 | tail : '\n' | |
139 | ={ln++;} | |
140 | | ';' | |
141 | ; | |
142 | ||
143 | re : e EQ e | |
144 | = bundle(3, $1, $3, "=" ); | |
145 | | e '<' e | |
146 | = bundle(3, $1, $3, ">" ); | |
147 | | e '>' e | |
148 | = bundle(3, $1, $3, "<" ); | |
149 | | e NE e | |
150 | = bundle(3, $1, $3, "!=" ); | |
151 | | e GE e | |
152 | = bundle(3, $1, $3, "!>" ); | |
153 | | e LE e | |
154 | = bundle(3, $1, $3, "!<" ); | |
155 | | e | |
156 | = bundle(2, $1, " 0!=" ); | |
157 | ; | |
158 | ||
159 | e : e '+' e | |
160 | = bundle(3, $1, $3, "+" ); | |
161 | | e '-' e | |
162 | = bundle(3, $1, $3, "-" ); | |
163 | | '-' e %prec UMINUS | |
164 | = bundle(3, " 0", $2, "-" ); | |
165 | | e '*' e | |
166 | = bundle(3, $1, $3, "*" ); | |
167 | | e '/' e | |
168 | = bundle(3, $1, $3, "/" ); | |
169 | | e '%' e | |
170 | = bundle(3, $1, $3, "%%" ); | |
171 | | e '^' e | |
172 | = bundle(3, $1, $3, "^" ); | |
173 | | LETTER '[' e ']' | |
174 | ={ bundle(3,$3, ";", geta($1)); } | |
175 | | LETTER INCR | |
176 | = bundle(4, "l", $1, "d1+s", $1 ); | |
177 | | INCR LETTER | |
178 | = bundle(4, "l", $2, "1+ds", $2 ); | |
179 | | DECR LETTER | |
180 | = bundle(4, "l", $2, "1-ds", $2 ); | |
181 | | LETTER DECR | |
182 | = bundle(4, "l", $1, "d1-s", $1 ); | |
183 | | LETTER '[' e ']' INCR | |
184 | = bundle(7,$3,";",geta($1),"d1+",$3,":",geta($1)); | |
185 | | INCR LETTER '[' e ']' | |
186 | = bundle(7,$4,";",geta($2),"1+d",$4,":",geta($2)); | |
187 | | LETTER '[' e ']' DECR | |
188 | = bundle(7,$3,";",geta($1),"d1-",$3,":",geta($1)); | |
189 | | DECR LETTER '[' e ']' | |
190 | = bundle(7,$4,";",geta($2),"1-d",$4,":",geta($2)); | |
191 | | SCALE INCR | |
192 | = bundle(1,"Kd1+k"); | |
193 | | INCR SCALE | |
194 | = bundle(1,"K1+dk"); | |
195 | | SCALE DECR | |
196 | = bundle(1,"Kd1-k"); | |
197 | | DECR SCALE | |
198 | = bundle(1,"K1-dk"); | |
199 | | BASE INCR | |
200 | = bundle(1,"Id1+i"); | |
201 | | INCR BASE | |
202 | = bundle(1,"I1+di"); | |
203 | | BASE DECR | |
204 | = bundle(1,"Id1-i"); | |
205 | | DECR BASE | |
206 | = bundle(1,"I1-di"); | |
207 | | OBASE INCR | |
208 | = bundle(1,"Od1+o"); | |
209 | | INCR OBASE | |
210 | = bundle(1,"O1+do"); | |
211 | | OBASE DECR | |
212 | = bundle(1,"Od1-o"); | |
213 | | DECR OBASE | |
214 | = bundle(1,"O1-do"); | |
215 | | LETTER '(' cargs ')' | |
216 | = bundle(4, $3, "l", getf($1), "x" ); | |
217 | | LETTER '(' ')' | |
218 | = bundle(3, "l", getf($1), "x" ); | |
219 | | cons | |
220 | ={ bundle(2, " ", $1 ); } | |
221 | | DOT cons | |
222 | ={ bundle(2, " .", $2 ); } | |
223 | | cons DOT cons | |
224 | ={ bundle(4, " ", $1, ".", $3 ); } | |
225 | | cons DOT | |
226 | ={ bundle(3, " ", $1, "." ); } | |
227 | | DOT | |
228 | ={ $$ = "l."; } | |
229 | | LETTER | |
230 | = { bundle(2, "l", $1 ); } | |
231 | | LETTER '=' e | |
232 | ={ bundle(3, $3, "ds", $1 ); } | |
233 | | LETTER EQOP e %prec '=' | |
234 | ={ bundle(6, "l", $1, $3, $2, "ds", $1 ); } | |
235 | | LETTER '[' e ']' '=' e | |
236 | = { bundle(5,$6,"d",$3,":",geta($1)); } | |
237 | | LETTER '[' e ']' EQOP e | |
238 | = { bundle(9,$3,";",geta($1),$6,$5,"d",$3,":",geta($1)); } | |
239 | | LENGTH '(' e ')' | |
240 | = bundle(2,$3,"Z"); | |
241 | | SCALE '(' e ')' | |
242 | = bundle(2,$3,"X"); /* must be before '(' e ')' */ | |
243 | | '(' e ')' | |
244 | = { $$ = $2; } | |
245 | | '?' | |
246 | ={ bundle(1, "?" ); } | |
247 | | SQRT '(' e ')' | |
248 | ={ bundle(2, $3, "v" ); } | |
249 | | '~' LETTER | |
250 | ={ bundle(2,"L",$2); } | |
251 | | SCALE '=' e | |
252 | = bundle(2,$3,"dk"); | |
253 | | SCALE EQOP e %prec '=' | |
254 | = bundle(4,"K",$3,$2,"dk"); | |
255 | | BASE '=' e | |
256 | = bundle(2,$3,"di"); | |
257 | | BASE EQOP e %prec '=' | |
258 | = bundle(4,"I",$3,$2,"di"); | |
259 | | OBASE '=' e | |
260 | = bundle(2,$3,"do"); | |
261 | | OBASE EQOP e %prec '=' | |
262 | = bundle(4,"O",$3,$2,"do"); | |
263 | | SCALE | |
264 | = bundle(1,"K"); | |
265 | | BASE | |
266 | = bundle(1,"I"); | |
267 | | OBASE | |
268 | = bundle(1,"O"); | |
269 | ; | |
270 | ||
271 | cargs : eora | |
272 | | cargs ',' eora | |
273 | = bundle(2, $1, $3 ); | |
274 | ; | |
275 | eora: e | |
276 | | LETTER '[' ']' | |
277 | =bundle(2,"l",geta($1)); | |
278 | ; | |
279 | ||
280 | cons : constant | |
281 | ={ *cp++ = '\0'; } | |
282 | ||
283 | constant: | |
284 | '_' | |
285 | ={ $$ = cp; *cp++ = '_'; } | |
286 | | DIGIT | |
287 | ={ $$ = cp; *cp++ = $1; } | |
288 | | constant DIGIT | |
289 | ={ *cp++ = $2; } | |
290 | ; | |
291 | ||
292 | CRS : | |
293 | ={ $$ = cp; *cp++ = crs++; *cp++ = '\0'; | |
294 | if(crs == '[')crs+=3; | |
295 | if(crs == 'a')crs='{'; | |
296 | if(crs >= 0241){yyerror("program too big"); | |
297 | getout(); | |
298 | } | |
299 | bstack[bindx++] = lev++; } | |
300 | ; | |
301 | ||
302 | def : _DEFINE LETTER '(' | |
303 | ={ $$ = getf($2); | |
304 | pre = ""; | |
305 | post = ""; | |
306 | lev = 1; | |
307 | bstack[bindx=0] = 0; | |
308 | } | |
309 | ; | |
310 | ||
311 | dargs : | |
312 | | lora | |
313 | ={ pp( $1 ); } | |
314 | | dargs ',' lora | |
315 | ={ pp( $3 ); } | |
316 | ; | |
317 | ||
318 | dlets : lora | |
319 | ={ tp($1); } | |
320 | | dlets ',' lora | |
321 | ={ tp($3); } | |
322 | ; | |
323 | lora : LETTER | |
324 | | LETTER '[' ']' | |
325 | ={ $$ = geta($1); } | |
326 | ; | |
327 | ||
328 | %% | |
329 | # define error 256 | |
330 | ||
331 | int peekc = -1; | |
332 | int sargc; | |
333 | int ifile; | |
334 | char **sargv; | |
335 | ||
336 | char funtab[52] = { | |
337 | 01,0,02,0,03,0,04,0,05,0,06,0,07,0,010,0,011,0,012,0,013,0,014,0,015,0,016,0,017,0, | |
338 | 020,0,021,0,022,0,023,0,024,0,025,0,026,0,027,0,030,0,031,0,032,0 }; | |
339 | char atab[52] = { | |
340 | 0241,0,0242,0,0243,0,0244,0,0245,0,0246,0,0247,0,0250,0,0251,0,0252,0,0253,0, | |
341 | 0254,0,0255,0,0256,0,0257,0,0260,0,0261,0,0262,0,0263,0,0264,0,0265,0,0266,0, | |
342 | 0267,0,0270,0,0271,0,0272,0}; | |
343 | char *letr[26] = { | |
344 | "a","b","c","d","e","f","g","h","i","j", | |
345 | "k","l","m","n","o","p","q","r","s","t", | |
346 | "u","v","w","x","y","z" } ; | |
347 | char *dot = { "." }; | |
348 | yylex(){ | |
349 | int c, ch; | |
350 | restart: | |
351 | c = getch(); | |
352 | peekc = -1; | |
353 | while( c == ' ' || c == '\t' ) c = getch(); | |
354 | if(c == '\\'){ | |
355 | getch(); | |
356 | goto restart; | |
357 | } | |
358 | if( c<= 'z' && c >= 'a' ) { | |
359 | /* look ahead to look for reserved words */ | |
360 | peekc = getch(); | |
361 | if( peekc >= 'a' && peekc <= 'z' ){ /* must be reserved word */ | |
362 | if( c=='i' && peekc=='f' ){ c=_IF; goto skip; } | |
363 | if( c=='w' && peekc=='h' ){ c=_WHILE; goto skip; } | |
364 | if( c=='f' && peekc=='o' ){ c=_FOR; goto skip; } | |
365 | if( c=='s' && peekc=='q' ){ c=SQRT; goto skip; } | |
366 | if( c=='r' && peekc=='e' ){ c=_RETURN; goto skip; } | |
367 | if( c=='b' && peekc=='r' ){ c=_BREAK; goto skip; } | |
368 | if( c=='d' && peekc=='e' ){ c=_DEFINE; goto skip; } | |
369 | if( c=='s' && peekc=='c' ){ c= SCALE; goto skip; } | |
370 | if( c=='b' && peekc=='a' ){ c=BASE; goto skip; } | |
371 | if( c=='i' && peekc == 'b'){ c=BASE; goto skip; } | |
372 | if( c=='o' && peekc=='b' ){ c=OBASE; goto skip; } | |
373 | if( c=='d' && peekc=='i' ){ c=FFF; goto skip; } | |
374 | if( c=='a' && peekc=='u' ){ c=_AUTO; goto skip; } | |
375 | if( c == 'l' && peekc=='e'){ c=LENGTH; goto skip; } | |
376 | if( c == 'q' && peekc == 'u'){getout();} | |
377 | /* could not be found */ | |
378 | return( error ); | |
379 | skip: /* skip over rest of word */ | |
380 | peekc = -1; | |
381 | while( (ch = getch()) >= 'a' && ch <= 'z' ); | |
382 | peekc = ch; | |
383 | return( c ); | |
384 | } | |
385 | ||
386 | /* usual case; just one single letter */ | |
387 | ||
388 | yylval = letr[c-'a']; | |
389 | return( LETTER ); | |
390 | } | |
391 | if( c>= '0' && c <= '9' || c>= 'A' && c<= 'F' ){ | |
392 | yylval = c; | |
393 | return( DIGIT ); | |
394 | } | |
395 | switch( c ){ | |
396 | case '.': return( DOT ); | |
397 | case '=': | |
398 | switch( peekc = getch() ){ | |
399 | case '=': c=EQ; goto gotit; | |
400 | case '+': c=EQPL; goto gotit; | |
401 | case '-': c=EQMI; goto gotit; | |
402 | case '*': c=EQMUL; goto gotit; | |
403 | case '/': c=EQDIV; goto gotit; | |
404 | case '%': c=EQREM; goto gotit; | |
405 | case '^': c=EQEXP; goto gotit; | |
406 | default: return( '=' ); | |
407 | gotit: peekc = -1; return(c); | |
408 | } | |
3321b8ce BJ |
409 | case '+': return( cpeek( '+', INCR, cpeek( '=', EQPL, '+') ) ); |
410 | case '-': return( cpeek( '-', DECR, cpeek( '=', EQMI, '-') ) ); | |
a27f2922 BJ |
411 | case '<': return( cpeek( '=', LE, '<' ) ); |
412 | case '>': return( cpeek( '=', GE, '>' ) ); | |
413 | case '!': return( cpeek( '=', NE, '!' ) ); | |
414 | case '/': | |
415 | if((peekc = getch()) == '*'){ | |
416 | peekc = -1; | |
417 | while((getch() != '*') || ((peekc = getch()) != '/')); | |
418 | peekc = -1; | |
419 | goto restart; | |
420 | } | |
3321b8ce BJ |
421 | else if (peekc == '=') { |
422 | c=EQDIV; | |
423 | goto gotit; | |
424 | } | |
a27f2922 | 425 | else return(c); |
3321b8ce BJ |
426 | case '*': |
427 | return( cpeek( '=', EQMUL, '*' ) ); | |
428 | case '%': | |
429 | return( cpeek( '=', EQREM, '%' ) ); | |
430 | case '^': | |
431 | return( cpeek( '=', EQEXP, '^' ) ); | |
a27f2922 BJ |
432 | case '"': |
433 | yylval = str; | |
434 | while((c=getch()) != '"'){*str++ = c; | |
435 | if(str >= &string[999]){yyerror("string space exceeded"); | |
436 | getout(); | |
437 | } | |
438 | } | |
439 | *str++ = '\0'; | |
440 | return(QSTR); | |
441 | default: return( c ); | |
442 | } | |
443 | } | |
444 | ||
445 | cpeek( c, yes, no ){ | |
446 | if( (peekc=getch()) != c ) return( no ); | |
447 | else { | |
448 | peekc = -1; | |
449 | return( yes ); | |
450 | } | |
451 | } | |
452 | ||
453 | getch(){ | |
454 | int ch; | |
455 | loop: | |
456 | ch = (peekc < 0) ? getc(in) : peekc; | |
457 | peekc = -1; | |
458 | if(ch != EOF)return(ch); | |
459 | if(++ifile > sargc){ | |
460 | if(ifile >= sargc+2)getout(); | |
461 | in = stdin; | |
462 | ln = 0; | |
463 | goto loop; | |
464 | } | |
465 | fclose(in); | |
466 | if((in = fopen(sargv[ifile],"r")) != NULL){ | |
467 | ln = 0; | |
468 | ss = sargv[ifile]; | |
469 | goto loop; | |
470 | } | |
471 | yyerror("cannot open input file"); | |
472 | } | |
473 | # define b_sp_max 3000 | |
474 | int b_space [ b_sp_max ]; | |
475 | int * b_sp_nxt = { b_space }; | |
476 | ||
477 | int bdebug = 0; | |
478 | bundle(a){ | |
479 | int i, *p, *q; | |
480 | ||
481 | p = &a; | |
482 | i = *p++; | |
483 | q = b_sp_nxt; | |
484 | if( bdebug ) printf("bundle %d elements at %o\n",i, q ); | |
485 | while(i-- > 0){ | |
486 | if( b_sp_nxt >= & b_space[b_sp_max] ) yyerror( "bundling space exceeded" ); | |
487 | * b_sp_nxt++ = *p++; | |
488 | } | |
489 | * b_sp_nxt++ = 0; | |
490 | yyval = q; | |
491 | return( q ); | |
492 | } | |
493 | ||
494 | routput(p) int *p; { | |
495 | if( bdebug ) printf("routput(%o)\n", p ); | |
496 | if( p >= &b_space[0] && p < &b_space[b_sp_max]){ | |
497 | /* part of a bundle */ | |
498 | while( *p != 0 ) routput( *p++ ); | |
499 | } | |
500 | else printf( p ); /* character string */ | |
501 | } | |
502 | ||
503 | output( p ) int *p; { | |
504 | routput( p ); | |
505 | b_sp_nxt = & b_space[0]; | |
506 | printf( "\n" ); | |
507 | fflush(stdout); | |
508 | cp = cary; | |
509 | crs = rcrs; | |
510 | } | |
511 | ||
512 | conout( p, s ) int *p; char *s; { | |
513 | printf("["); | |
514 | routput( p ); | |
515 | printf("]s%s\n", s ); | |
516 | fflush(stdout); | |
517 | lev--; | |
518 | } | |
519 | ||
520 | yyerror( s ) char *s; { | |
521 | if(ifile > sargc)ss="teletype"; | |
522 | printf("c[%s on line %d, %s]pc\n", s ,ln+1,ss); | |
523 | fflush(stdout); | |
524 | cp = cary; | |
525 | crs = rcrs; | |
526 | bindx = 0; | |
527 | lev = 0; | |
528 | b_sp_nxt = &b_space[0]; | |
529 | } | |
530 | ||
531 | pp( s ) char *s; { | |
532 | /* puts the relevant stuff on pre and post for the letter s */ | |
533 | ||
534 | bundle(3, "S", s, pre ); | |
535 | pre = yyval; | |
536 | bundle(4, post, "L", s, "s." ); | |
537 | post = yyval; | |
538 | } | |
539 | ||
540 | tp( s ) char *s; { /* same as pp, but for temps */ | |
541 | bundle(3, "0S", s, pre ); | |
542 | pre = yyval; | |
543 | bundle(4, post, "L", s, "s." ); | |
544 | post = yyval; | |
545 | } | |
546 | ||
547 | yyinit(argc,argv) int argc; char *argv[];{ | |
548 | signal( 2, (int(*)())1 ); /* ignore all interrupts */ | |
549 | sargv=argv; | |
550 | sargc= -- argc; | |
551 | if(sargc == 0)in=stdin; | |
552 | else if((in = fopen(sargv[1],"r")) == NULL) | |
553 | yyerror("cannot open input file"); | |
554 | ifile = 1; | |
555 | ln = 0; | |
556 | ss = sargv[1]; | |
557 | } | |
558 | int *getout(){ | |
559 | printf("q"); | |
560 | fflush(stdout); | |
561 | exit(); | |
562 | } | |
563 | ||
564 | int * | |
565 | getf(p) char *p;{ | |
566 | return(&funtab[2*(*p -0141)]); | |
567 | } | |
568 | int * | |
569 | geta(p) char *p;{ | |
570 | return(&atab[2*(*p - 0141)]); | |
571 | } | |
572 | ||
573 | main(argc, argv) | |
574 | char **argv; | |
575 | { | |
576 | int p[2]; | |
577 | ||
578 | ||
579 | if (argc > 1 && *argv[1] == '-') { | |
580 | if((argv[1][1] == 'd')||(argv[1][1] == 'c')){ | |
581 | yyinit(--argc, ++argv); | |
582 | yyparse(); | |
583 | exit(); | |
584 | } | |
585 | if(argv[1][1] != 'l'){ | |
586 | printf("unrecognizable argument\n"); | |
587 | fflush(stdout); | |
588 | exit(); | |
589 | } | |
590 | argv[1] = "/usr/lib/lib.b"; | |
591 | } | |
592 | pipe(p); | |
593 | if (fork()==0) { | |
594 | close(1); | |
595 | dup(p[1]); | |
596 | close(p[0]); | |
597 | close(p[1]); | |
598 | yyinit(argc, argv); | |
599 | yyparse(); | |
600 | exit(); | |
601 | } | |
602 | close(0); | |
603 | dup(p[0]); | |
604 | close(p[0]); | |
605 | close(p[1]); | |
606 | execl("/bin/dc", "dc", "-", 0); | |
607 | execl("/usr/bin/dc", "dc", "-", 0); | |
608 | } |