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1.1 root 1: /* Copyright (c) 1979 Regents of the University of California */
2:
3: static char sccsid[] = "@(#)main.c 1.1 8/27/80";
4:
5: #include "whoami.h"
6: #include "0.h"
7: #include "yy.h"
8: #include <signal.h>
9: #include "objfmt.h"
10:
11: /*
12: * This version of pi has been in use at Berkeley since May 1977
13: * and is very stable, except for the syntactic error recovery which
14: * has just been written. Please report any problems with the error
15: * recovery to the second author at the address given in the file
16: * READ_ME. The second author takes full responsibility for any bugs
17: * in the syntactic error recovery.
18: */
19:
20: char piusage[] = "pi [ -blnpstuw ] [ -i file ... ] name.p";
21: char pixusage[] = "pix [ -blnpstuw ] [ -i file ... ] name.p [ arg ... ]";
22: char pcusage[] = "pc [ options ] [ -o file ] [ -i file ... ] name.p";
23:
24: char *usageis = piusage;
25:
26: char *errfile = ERR_STRNGS;
27:
28: #ifdef OBJ
29: char *obj = "obj";
30: #endif OBJ
31: #ifdef PC
32: char *pcname = "pc.pc1";
33: #endif PC
34: #ifdef PTREE
35: char *pTreeName = "pi.pTree";
36: #endif PTREE
37:
38: /*
39: * Be careful changing errfile and howfile.
40: * There are the "magic" constants 9 and 15 immediately below.
41: * errfile is now defined by ERR_STRNGS, in objfmt.h,
42: * and its leading path name length is ERR_PATHLEN long.
43: * this for executing out of the current directory if running as `a.something'.
44: */
45: #ifdef OBJ
46: char *howfile = "/usr/lib/how_pi\0";
47: #endif OBJ
48: #ifdef PC
49: char *howfile = "/usr/lib/how_pc";
50: #endif PC
51:
52: int onintr();
53:
54: extern char *lastname;
55:
56: FILE *ibuf;
57: FILE *pcstream = NULL;
58:
59: /*
60: * these are made real variables
61: * so they can be changed
62: * if you are compiling on a smaller machine
63: */
64: double MAXINT = 2147483647.;
65: double MININT = -2147483648.;
66:
67: /*
68: * Main program for pi.
69: * Process options, then call yymain
70: * to do all the real work.
71: */
72: main(argc, argv)
73: int argc;
74: char *argv[];
75: {
76: register char *cp;
77: register c;
78: int i;
79:
80: if (argv[0][0] == 'a')
81: errfile += ERR_PATHLEN , howfile += 9;
82: # ifdef OBJ
83: if (argv[0][0] == '-' && argv[0][1] == 'o') {
84: obj = &argv[0][2];
85: usageis = pixusage;
86: howfile[15] = 'x';
87: ofil = 3;
88: } else {
89: ofil = creat(obj, 0755);
90: if (ofil < 0) {
91: perror(obj);
92: pexit(NOSTART);
93: }
94: }
95: # endif OBJ
96: argv++, argc--;
97: if (argc == 0) {
98: i = fork();
99: if (i == -1)
100: goto usage;
101: if (i == 0) {
102: execl("/bin/cat", "cat", howfile, 0);
103: goto usage;
104: }
105: while (wait(&i) != -1)
106: continue;
107: pexit(NOSTART);
108: }
109: # ifdef OBJ
110: opt('p') = opt('t') = opt('b') = 1;
111: while (argc > 0) {
112: cp = argv[0];
113: if (*cp++ != '-')
114: break;
115: while (c = *cp++) switch (c) {
116: #ifdef DEBUG
117: case 'k':
118: case 'r':
119: case 'y':
120: togopt(c);
121: continue;
122: case 'K':
123: yycosts();
124: pexit(NOSTART);
125: case 'A':
126: testtrace++;
127: case 'F':
128: fulltrace++;
129: case 'E':
130: errtrace++;
131: opt('r')++;
132: continue;
133: case 'U':
134: yyunique = 0;
135: continue;
136: #endif
137: case 'b':
138: opt('b') = 2;
139: continue;
140: case 'i':
141: pflist = argv + 1;
142: pflstc = 0;
143: while (argc > 1) {
144: if (dotted(argv[1], 'p'))
145: break;
146: pflstc++, argc--, argv++;
147: }
148: if (pflstc == 0)
149: goto usage;
150: continue;
151: case 'l':
152: case 'n':
153: case 'p':
154: case 's':
155: case 't':
156: case 'u':
157: case 'w':
158: togopt(c);
159: continue;
160: case 'z':
161: monflg++;
162: continue;
163: default:
164: usage:
165: Perror( "Usage", usageis);
166: pexit(NOSTART);
167: }
168: argc--, argv++;
169: }
170: # endif OBJ
171: # ifdef PC
172: opt( 'b' ) = 1;
173: opt( 'g' ) = 0;
174: opt( 't' ) = 0;
175: opt( 'p' ) = 0;
176: usageis = pcusage;
177: while ( argc > 0 ) {
178: cp = argv[0];
179: if ( *cp++ != '-' ) {
180: break;
181: }
182: c = *cp++;
183: switch( c ) {
184: #ifdef DEBUG
185: case 'k':
186: case 'r':
187: case 'y':
188: togopt(c);
189: break;
190: case 'K':
191: yycosts();
192: pexit(NOSTART);
193: case 'A':
194: testtrace++;
195: /* and fall through */
196: case 'F':
197: fulltrace++;
198: /* and fall through */
199: case 'E':
200: errtrace++;
201: opt('r')++;
202: break;
203: case 'U':
204: yyunique = 0;
205: break;
206: #endif
207: case 'b':
208: opt('b') = 2;
209: break;
210: case 'i':
211: pflist = argv + 1;
212: pflstc = 0;
213: while (argc > 1) {
214: if (dotted(argv[1], 'p'))
215: break;
216: pflstc++, argc--, argv++;
217: }
218: if (pflstc == 0)
219: goto usage;
220: break;
221: /*
222: * output file for the first pass
223: */
224: case 'o':
225: if ( argc < 2 ) {
226: goto usage;
227: }
228: argv++;
229: argc--;
230: pcname = argv[0];
231: break;
232: case 'C':
233: /*
234: * since -t is an ld switch, use -C
235: * to turn on tests
236: */
237: togopt( 't' );
238: break;
239: case 'g':
240: /*
241: * sdb symbol table
242: */
243: togopt( 'g' );
244: break;
245: case 'l':
246: case 's':
247: case 'u':
248: case 'w':
249: togopt(c);
250: break;
251: case 'p':
252: /*
253: * -p on the command line means profile
254: */
255: profflag++;
256: break;
257: case 'z':
258: monflg++;
259: break;
260: default:
261: usage:
262: Perror( "Usage", usageis);
263: pexit(NOSTART);
264: }
265: argc--;
266: argv++;
267: }
268: # endif PC
269: if (argc != 1)
270: goto usage;
271: efil = open ( errfile, 0 );
272: if ( efil < 0 )
273: perror(errfile), pexit(NOSTART);
274: filename = argv[0];
275: if (!dotted(filename, 'p')) {
276: Perror(filename, "Name must end in '.p'");
277: pexit(NOSTART);
278: }
279: close(0);
280: if ( ( ibuf = fopen( filename , "r" ) ) == NULL )
281: perror(filename), pexit(NOSTART);
282: ibp = ibuf;
283: # ifdef PC
284: if ( ( pcstream = fopen( pcname , "w" ) ) == NULL ) {
285: perror( pcname );
286: pexit( NOSTART );
287: }
288: stabsource( filename );
289: # endif PC
290: # ifdef PTREE
291: # define MAXpPAGES 16
292: if ( ! pCreate( pTreeName , MAXpPAGES ) ) {
293: perror( pTreeName );
294: pexit( NOSTART );
295: }
296: # endif PTREE
297: if ( signal( SIGINT , SIG_IGN ) != SIG_IGN )
298: signal( SIGINT , onintr );
299: if (opt('l')) {
300: opt('n')++;
301: yysetfile(filename);
302: opt('n')--;
303: }
304: yymain();
305: /* No return */
306: }
307:
308: pchr(c)
309: char c;
310: {
311:
312: putc ( c , stdout );
313: }
314:
315: char ugh[] = "Fatal error in pi\n";
316: /*
317: * Exit from the Pascal system.
318: * We throw in an ungraceful termination
319: * message if c > 1 indicating a severe
320: * error such as running out of memory
321: * or an internal inconsistency.
322: */
323: pexit(c)
324: int c;
325: {
326:
327: if (opt('l') && c != DIED && c != NOSTART)
328: while (getline() != -1)
329: continue;
330: yyflush();
331: switch (c) {
332: case DIED:
333: write(2, ugh, sizeof ugh);
334: case NOSTART:
335: case ERRS:
336: # ifdef OBJ
337: if (ofil > 0)
338: unlink(obj);
339: # endif OBJ
340: # ifdef PC
341: if ( pcstream != NULL ) {
342: unlink( pcname );
343: }
344: # endif PC
345: break;
346: case AOK:
347: # ifdef OBJ
348: pflush();
349: # endif OBJ
350: # ifdef PC
351: puteof();
352: # endif PC
353: break;
354: }
355: /*
356: * this to gather statistics on programs being compiled
357: * taken 20 june 79 ... peter
358: *
359: * if (fork() == 0) {
360: * char *cp = "-0";
361: * cp[1] += c;
362: * execl("/usr/lib/gather", "gather", cp, filename, 0);
363: * exit(1);
364: * }
365: */
366: # ifdef PTREE
367: pFinish();
368: # endif
369: exit(c);
370: }
371:
372: onintr()
373: {
374:
375: signal( SIGINT , SIG_IGN );
376: pexit(NOSTART);
377: }
378:
379: /*
380: * Get an error message from the error message file
381: */
382: geterr(seekpt, buf)
383: int seekpt;
384: char *buf;
385: {
386:
387: lseek(efil, (long) seekpt, 0);
388: if (read(efil, buf, 256) <= 0)
389: perror(errfile), pexit(DIED);
390: }
391:
392: header()
393: {
394: extern char version[];
395: static char anyheaders;
396:
397: gettime( filename );
398: if (anyheaders && opt('n'))
399: putc( '\f' , stdout );
400: anyheaders++;
401: # ifdef OBJ
402: printf("Berkeley Pascal PI -- Version 2.0 (%s)\n\n%s %s\n\n",
403: version, myctime(&tvec), filename);
404: # endif OBJ
405: # ifdef PC
406: printf("Berkeley Pascal PC -- Version 2.0 (%s)\n\n%s %s\n\n",
407: version, myctime(&tvec), filename);
408: # endif PC
409: }
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