1 /*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California 94043
28 */
29
30 /*
31 * rpc_scan.c, Scanner for the RPC protocol compiler
32 * Copyright (C) 1987, Sun Microsystems, Inc.
33 */
34
35 #include <sys/types.h>
36
37 #include <sys/wait.h>
38 #include <stdio.h>
39 #include <ctype.h>
40 #include <string.h>
41 #include "rpc_parse.h"
42 #include "rpc_scan.h"
43 #include "rpc_util.h"
44
45 #define startcomment(where) (where[0] == '/' && where[1] == '*')
46 #define endcomment(where) (where[-1] == '*' && where[0] == '/')
47
48 static int pushed = 0; /* is a token pushed */
49 static token lasttok; /* last token, if pushed */
50
51 static void unget_token( token * );
52 static void findstrconst(char **, const char **);
53 static void findchrconst(char **, const char **);
54 static void findconst(char **, const char **);
55 static void findkind( char **, token * );
56 static int cppline( char * );
57 static int directive( char * );
58 static void printdirective( char * );
59 static void docppline(char *, int *, const char **);
60
61 /*
62 * scan expecting 1 given token
63 */
64 void
scan(tok_kind expect,token * tokp)65 scan(tok_kind expect, token *tokp)
66 {
67 get_token(tokp);
68 if (tokp->kind != expect) {
69 expected1(expect);
70 }
71 }
72
73 /*
74 * scan expecting any of the 2 given tokens
75 */
76 void
scan2(tok_kind expect1,tok_kind expect2,token * tokp)77 scan2(tok_kind expect1, tok_kind expect2, token *tokp)
78 {
79 get_token(tokp);
80 if (tokp->kind != expect1 && tokp->kind != expect2) {
81 expected2(expect1, expect2);
82 }
83 }
84
85 /*
86 * scan expecting any of the 3 given token
87 */
88 void
scan3(tok_kind expect1,tok_kind expect2,tok_kind expect3,token * tokp)89 scan3(tok_kind expect1, tok_kind expect2, tok_kind expect3, token *tokp)
90 {
91 get_token(tokp);
92 if (tokp->kind != expect1 && tokp->kind != expect2
93 && tokp->kind != expect3) {
94 expected3(expect1, expect2, expect3);
95 }
96 }
97
98 /*
99 * scan expecting a constant, possibly symbolic
100 */
101 void
scan_num(token * tokp)102 scan_num(token *tokp)
103 {
104 get_token(tokp);
105 switch (tokp->kind) {
106 case TOK_IDENT:
107 break;
108 default:
109 error("constant or identifier expected");
110 }
111 }
112
113 /*
114 * Peek at the next token
115 */
116 void
peek(token * tokp)117 peek(token *tokp)
118 {
119 get_token(tokp);
120 unget_token(tokp);
121 }
122
123 /*
124 * Peek at the next token and scan it if it matches what you expect
125 */
126 int
peekscan(tok_kind expect,token * tokp)127 peekscan(tok_kind expect, token *tokp)
128 {
129 peek(tokp);
130 if (tokp->kind == expect) {
131 get_token(tokp);
132 return (1);
133 }
134 return (0);
135 }
136
137 /*
138 * Get the next token, printing out any directive that are encountered.
139 */
140 void
get_token(token * tokp)141 get_token(token *tokp)
142 {
143 int commenting;
144 int stat = 0;
145
146
147 if (pushed) {
148 pushed = 0;
149 *tokp = lasttok;
150 return;
151 }
152 commenting = 0;
153 for (;;) {
154 if (*where == 0) {
155 for (;;) {
156 if (!fgets(curline, MAXLINESIZE, fin)) {
157 tokp->kind = TOK_EOF;
158 /* now check if cpp returned non NULL value */
159 waitpid(childpid, &stat, WUNTRACED);
160 if (stat > 0) {
161 /* Set return value from rpcgen */
162 nonfatalerrors = stat >> 8;
163 }
164 *where = 0;
165 return;
166 }
167 linenum++;
168 if (commenting) {
169 break;
170 } else if (cppline(curline)) {
171 docppline(curline, &linenum,
172 &infilename);
173 } else if (directive(curline)) {
174 printdirective(curline);
175 } else {
176 break;
177 }
178 }
179 where = curline;
180 } else if (isspace(*where)) {
181 while (isspace(*where)) {
182 where++; /* eat */
183 }
184 } else if (commenting) {
185 for (where++; *where; where++) {
186 if (endcomment(where)) {
187 where++;
188 commenting--;
189 break;
190 }
191 }
192 } else if (startcomment(where)) {
193 where += 2;
194 commenting++;
195 } else {
196 break;
197 }
198 }
199
200 /*
201 * 'where' is not whitespace, comment or directive Must be a token!
202 */
203 switch (*where) {
204 case ':':
205 tokp->kind = TOK_COLON;
206 where++;
207 break;
208 case ';':
209 tokp->kind = TOK_SEMICOLON;
210 where++;
211 break;
212 case ',':
213 tokp->kind = TOK_COMMA;
214 where++;
215 break;
216 case '=':
217 tokp->kind = TOK_EQUAL;
218 where++;
219 break;
220 case '*':
221 tokp->kind = TOK_STAR;
222 where++;
223 break;
224 case '[':
225 tokp->kind = TOK_LBRACKET;
226 where++;
227 break;
228 case ']':
229 tokp->kind = TOK_RBRACKET;
230 where++;
231 break;
232 case '{':
233 tokp->kind = TOK_LBRACE;
234 where++;
235 break;
236 case '}':
237 tokp->kind = TOK_RBRACE;
238 where++;
239 break;
240 case '(':
241 tokp->kind = TOK_LPAREN;
242 where++;
243 break;
244 case ')':
245 tokp->kind = TOK_RPAREN;
246 where++;
247 break;
248 case '<':
249 tokp->kind = TOK_LANGLE;
250 where++;
251 break;
252 case '>':
253 tokp->kind = TOK_RANGLE;
254 where++;
255 break;
256
257 case '"':
258 tokp->kind = TOK_STRCONST;
259 findstrconst(&where, &tokp->str);
260 break;
261 case '\'':
262 tokp->kind = TOK_CHARCONST;
263 findchrconst(&where, &tokp->str);
264 break;
265
266 case '-':
267 case '0':
268 case '1':
269 case '2':
270 case '3':
271 case '4':
272 case '5':
273 case '6':
274 case '7':
275 case '8':
276 case '9':
277 tokp->kind = TOK_IDENT;
278 findconst(&where, &tokp->str);
279 break;
280
281 default:
282 if (!(isalpha(*where) || *where == '_')) {
283 char buf[100];
284 char *p;
285
286 s_print(buf, "illegal character in file: ");
287 p = buf + strlen(buf);
288 if (isprint(*where)) {
289 s_print(p, "%c", *where);
290 } else {
291 s_print(p, "%d", *where);
292 }
293 error(buf);
294 }
295 findkind(&where, tokp);
296 break;
297 }
298 }
299
300 static void
unget_token(token * tokp)301 unget_token(token *tokp)
302 {
303 lasttok = *tokp;
304 pushed = 1;
305 }
306
307 static void
findstrconst(char ** str,const char ** val)308 findstrconst(char **str, const char **val)
309 {
310 char *p;
311 char *tmp;
312 int size;
313
314 p = *str;
315 do {
316 p++;
317 } while (*p && *p != '"');
318 if (*p == 0) {
319 error("unterminated string constant");
320 }
321 p++;
322 size = p - *str + 1;
323 tmp = xmalloc(size);
324 (void) strlcpy(tmp, *str, size);
325 *val = tmp;
326 *str = p;
327 }
328
329 static void
findchrconst(char ** str,const char ** val)330 findchrconst(char **str, const char **val)
331 {
332 char *p;
333 char *tmp;
334 int size;
335
336 p = *str;
337 do {
338 p++;
339 } while (*p && *p != '\'');
340 if (*p == 0) {
341 error("unterminated string constant");
342 }
343 p++;
344 size = p - *str + 1;
345 if (size != 4) {
346 error("empty char string");
347 }
348 tmp = xmalloc(size);
349 (void) strlcpy(tmp, *str, size);
350 *val = tmp;
351 *str = p;
352 }
353
354 static void
findconst(char ** str,const char ** val)355 findconst(char **str, const char **val)
356 {
357 char *p;
358 char *tmp;
359 int size;
360
361 p = *str;
362 if (*p == '0' && *(p + 1) == 'x') {
363 p++;
364 do {
365 p++;
366 } while (isxdigit(*p));
367 } else {
368 do {
369 p++;
370 } while (isdigit(*p));
371 }
372 size = p - *str + 1;
373 tmp = xmalloc(size);
374 (void) strlcpy(tmp, *str, size);
375 *val = tmp;
376 *str = p;
377 }
378
379 static token symbols[] = {
380 {TOK_CONST, "const"},
381 {TOK_UNION, "union"},
382 {TOK_SWITCH, "switch"},
383 {TOK_CASE, "case"},
384 {TOK_DEFAULT, "default"},
385 {TOK_STRUCT, "struct"},
386 {TOK_TYPEDEF, "typedef"},
387 {TOK_ENUM, "enum"},
388 {TOK_OPAQUE, "opaque"},
389 {TOK_BOOL, "bool"},
390 {TOK_VOID, "void"},
391 {TOK_CHAR, "char"},
392 {TOK_INT, "int"},
393 {TOK_UNSIGNED, "unsigned"},
394 {TOK_SHORT, "short"},
395 {TOK_LONG, "long"},
396 {TOK_HYPER, "hyper"},
397 {TOK_FLOAT, "float"},
398 {TOK_DOUBLE, "double"},
399 {TOK_QUAD, "quadruple"},
400 {TOK_STRING, "string"},
401 {TOK_PROGRAM, "program"},
402 {TOK_VERSION, "version"},
403 {TOK_EOF, "??????"},
404 };
405
406 static void
findkind(char ** mark,token * tokp)407 findkind(char **mark, token *tokp)
408 {
409 int len;
410 token *s;
411 char *str, *tmp;
412
413 str = *mark;
414 for (s = symbols; s->kind != TOK_EOF; s++) {
415 len = strlen(s->str);
416 if (strncmp(str, s->str, len) == 0) {
417 if (!isalnum(str[len]) && str[len] != '_') {
418 tokp->kind = s->kind;
419 tokp->str = s->str;
420 *mark = str + len;
421 return;
422 }
423 }
424 }
425 tokp->kind = TOK_IDENT;
426 for (len = 0; isalnum(str[len]) || str[len] == '_'; len++);
427 tmp = xmalloc(len + 1);
428 (void) strlcpy(tmp, str, len + 1);
429 tokp->str = tmp;
430 *mark = str + len;
431 }
432
433 static int
cppline(char * line)434 cppline(char *line)
435 {
436 return (line == curline && *line == '#');
437 }
438
439 static int
directive(char * line)440 directive(char *line)
441 {
442 return (line == curline && *line == '%');
443 }
444
445 static void
printdirective(char * line)446 printdirective(char *line)
447 {
448 f_print(fout, "%s", line + 1);
449 }
450
451 static void
docppline(char * line,int * lineno,const char ** fname)452 docppline(char *line, int *lineno, const char **fname)
453 {
454 char *file;
455 int num;
456 char *p;
457
458 line++;
459 while (isspace(*line)) {
460 line++;
461 }
462 num = atoi(line);
463 while (isdigit(*line)) {
464 line++;
465 }
466 while (isspace(*line)) {
467 line++;
468 }
469 if (*line != '"') {
470 error("preprocessor error");
471 }
472 line++;
473 p = file = xmalloc(strlen(line) + 1);
474 while (*line && *line != '"') {
475 *p++ = *line++;
476 }
477 if (*line == 0) {
478 error("preprocessor error");
479 }
480 *p = 0;
481 if (*file == 0) {
482 *fname = NULL;
483 free(file);
484 } else {
485 *fname = file;
486 }
487 *lineno = num - 1;
488 }
489