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1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Ozan Yigit. | |
7 | * | |
8 | * Redistribution and use in source and binary forms are permitted | |
9 | * provided that the above copyright notice and this paragraph are | |
10 | * duplicated in all such forms and that any documentation, | |
11 | * advertising materials, and other materials related to such | |
12 | * distribution and use acknowledge that the software was developed | |
13 | * by the University of California, Berkeley. The name of the | |
14 | * University may not be used to endorse or promote products derived | |
15 | * from this software without specific prior written permission. | |
16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
17 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
18 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
19 | */ | |
20 | ||
21 | #ifndef lint | |
22 | static char sccsid[] = "@(#)eval.c 5.1 (Berkeley) %G%"; | |
23 | #endif /* not lint */ | |
24 | ||
25 | /* | |
26 | * eval.c | |
27 | * Facility: m4 macro processor | |
28 | * by: oz | |
29 | */ | |
30 | ||
31 | #include "mdef.h" | |
32 | #include "extr.h" | |
33 | ||
34 | extern ndptr lookup(); | |
35 | extern char *strsave(); | |
36 | extern char *mktemp(); | |
37 | ||
38 | /* | |
39 | * eval - evaluate built-in macros. | |
40 | * argc - number of elements in argv. | |
41 | * argv - element vector : | |
42 | * argv[0] = definition of a user | |
43 | * macro or nil if built-in. | |
44 | * argv[1] = name of the macro or | |
45 | * built-in. | |
46 | * argv[2] = parameters to user-defined | |
47 | * . macro or built-in. | |
48 | * . | |
49 | * | |
50 | * Note that the minimum value for argc is 3. A call in the form | |
51 | * of macro-or-builtin() will result in: | |
52 | * argv[0] = nullstr | |
53 | * argv[1] = macro-or-builtin | |
54 | * argv[2] = nullstr | |
55 | * | |
56 | */ | |
57 | ||
58 | eval (argv, argc, td) | |
59 | register char *argv[]; | |
60 | register int argc; | |
61 | register int td; | |
62 | { | |
63 | register int c, n; | |
64 | static int sysval; | |
65 | ||
66 | #ifdef DEBUG | |
67 | printf("argc = %d\n", argc); | |
68 | for (n = 0; n < argc; n++) | |
69 | printf("argv[%d] = %s\n", n, argv[n]); | |
70 | #endif | |
71 | /* | |
72 | * if argc == 3 and argv[2] is null, | |
73 | * then we have macro-or-builtin() type call. | |
74 | * We adjust argc to avoid further checking.. | |
75 | * | |
76 | */ | |
77 | if (argc == 3 && !*(argv[2])) | |
78 | argc--; | |
79 | ||
80 | switch (td & ~STATIC) { | |
81 | ||
82 | case DEFITYPE: | |
83 | if (argc > 2) | |
84 | dodefine(argv[2], (argc > 3) ? argv[3] : null); | |
85 | break; | |
86 | ||
87 | case PUSDTYPE: | |
88 | if (argc > 2) | |
89 | dopushdef(argv[2], (argc > 3) ? argv[3] : null); | |
90 | break; | |
91 | ||
92 | case DUMPTYPE: | |
93 | dodump(argv, argc); | |
94 | break; | |
95 | ||
96 | case EXPRTYPE: | |
97 | /* | |
98 | * doexpr - evaluate arithmetic expression | |
99 | * | |
100 | */ | |
101 | if (argc > 2) | |
102 | pbnum(expr(argv[2])); | |
103 | break; | |
104 | ||
105 | case IFELTYPE: | |
106 | if (argc > 4) | |
107 | doifelse(argv, argc); | |
108 | break; | |
109 | ||
110 | case IFDFTYPE: | |
111 | /* | |
112 | * doifdef - select one of two alternatives based | |
113 | * on the existence of another definition | |
114 | */ | |
115 | if (argc > 3) { | |
116 | if (lookup(argv[2]) != nil) | |
117 | pbstr(argv[3]); | |
118 | else if (argc > 4) | |
119 | pbstr(argv[4]); | |
120 | } | |
121 | break; | |
122 | ||
123 | case LENGTYPE: | |
124 | /* | |
125 | * dolen - find the length of the argument | |
126 | * | |
127 | */ | |
128 | if (argc > 2) | |
129 | pbnum((argc > 2) ? strlen(argv[2]) : 0); | |
130 | break; | |
131 | ||
132 | case INCRTYPE: | |
133 | /* | |
134 | * doincr - increment the value of the argument | |
135 | * | |
136 | */ | |
137 | if (argc > 2) | |
138 | pbnum(atoi(argv[2]) + 1); | |
139 | break; | |
140 | ||
141 | case DECRTYPE: | |
142 | /* | |
143 | * dodecr - decrement the value of the argument | |
144 | * | |
145 | */ | |
146 | if (argc > 2) | |
147 | pbnum(atoi(argv[2]) - 1); | |
148 | break; | |
149 | ||
150 | #if unix || vms | |
151 | ||
152 | case SYSCTYPE: | |
153 | /* | |
154 | * dosys - execute system command | |
155 | * | |
156 | */ | |
157 | if (argc > 2) | |
158 | sysval = system(argv[2]); | |
159 | break; | |
160 | ||
161 | case SYSVTYPE: | |
162 | /* | |
163 | * dosysval - return value of the last system call. | |
164 | * | |
165 | */ | |
166 | pbnum(sysval); | |
167 | break; | |
168 | #endif | |
169 | ||
170 | case INCLTYPE: | |
171 | if (argc > 2) | |
172 | if (!doincl(argv[2])) { | |
173 | fprintf(stderr,"m4: %s: ",argv[2]); | |
174 | error("cannot open for read."); | |
175 | } | |
176 | break; | |
177 | ||
178 | case SINCTYPE: | |
179 | if (argc > 2) | |
180 | (void) doincl(argv[2]); | |
181 | break; | |
182 | #ifdef EXTENDED | |
183 | case PASTTYPE: | |
184 | if (argc > 2) | |
185 | if (!dopaste(argv[2])) { | |
186 | fprintf(stderr,"m4: %s: ",argv[2]); | |
187 | error("cannot open for read."); | |
188 | } | |
189 | break; | |
190 | ||
191 | case SPASTYPE: | |
192 | if (argc > 2) | |
193 | (void) dopaste(argv[2]); | |
194 | break; | |
195 | #endif | |
196 | case CHNQTYPE: | |
197 | dochq(argv, argc); | |
198 | break; | |
199 | ||
200 | case CHNCTYPE: | |
201 | dochc(argv, argc); | |
202 | break; | |
203 | ||
204 | case SUBSTYPE: | |
205 | /* | |
206 | * dosub - select substring | |
207 | * | |
208 | */ | |
209 | if (argc > 3) | |
210 | dosub(argv,argc); | |
211 | break; | |
212 | ||
213 | case SHIFTYPE: | |
214 | /* | |
215 | * doshift - push back all arguments except the | |
216 | * first one (i.e. skip argv[2]) | |
217 | */ | |
218 | if (argc > 3) { | |
219 | for (n = argc-1; n > 3; n--) { | |
220 | putback(rquote); | |
221 | pbstr(argv[n]); | |
222 | putback(lquote); | |
223 | putback(','); | |
224 | } | |
225 | putback(rquote); | |
226 | pbstr(argv[3]); | |
227 | putback(lquote); | |
228 | } | |
229 | break; | |
230 | ||
231 | case DIVRTYPE: | |
232 | if (argc > 2 && (n = atoi(argv[2])) != 0) | |
233 | dodiv(n); | |
234 | else { | |
235 | active = stdout; | |
236 | oindex = 0; | |
237 | } | |
238 | break; | |
239 | ||
240 | case UNDVTYPE: | |
241 | doundiv(argv, argc); | |
242 | break; | |
243 | ||
244 | case DIVNTYPE: | |
245 | /* | |
246 | * dodivnum - return the number of current | |
247 | * output diversion | |
248 | * | |
249 | */ | |
250 | pbnum(oindex); | |
251 | break; | |
252 | ||
253 | case UNDFTYPE: | |
254 | /* | |
255 | * doundefine - undefine a previously defined | |
256 | * macro(s) or m4 keyword(s). | |
257 | */ | |
258 | if (argc > 2) | |
259 | for (n = 2; n < argc; n++) | |
260 | remhash(argv[n], ALL); | |
261 | break; | |
262 | ||
263 | case POPDTYPE: | |
264 | /* | |
265 | * dopopdef - remove the topmost definitions of | |
266 | * macro(s) or m4 keyword(s). | |
267 | */ | |
268 | if (argc > 2) | |
269 | for (n = 2; n < argc; n++) | |
270 | remhash(argv[n], TOP); | |
271 | break; | |
272 | ||
273 | case MKTMTYPE: | |
274 | /* | |
275 | * dotemp - create a temporary file | |
276 | * | |
277 | */ | |
278 | if (argc > 2) | |
279 | pbstr(mktemp(argv[2])); | |
280 | break; | |
281 | ||
282 | case TRNLTYPE: | |
283 | /* | |
284 | * dotranslit - replace all characters in the | |
285 | * source string that appears in | |
286 | * the "from" string with the corresponding | |
287 | * characters in the "to" string. | |
288 | * | |
289 | */ | |
290 | if (argc > 3) { | |
291 | char temp[MAXTOK]; | |
292 | if (argc > 4) | |
293 | map(temp, argv[2], argv[3], argv[4]); | |
294 | else | |
295 | map(temp, argv[2], argv[3], null); | |
296 | pbstr(temp); | |
297 | } | |
298 | else | |
299 | if (argc > 2) | |
300 | pbstr(argv[2]); | |
301 | break; | |
302 | ||
303 | case INDXTYPE: | |
304 | /* | |
305 | * doindex - find the index of the second argument | |
306 | * string in the first argument string. | |
307 | * -1 if not present. | |
308 | */ | |
309 | pbnum((argc > 3) ? indx(argv[2], argv[3]) : -1); | |
310 | break; | |
311 | ||
312 | case ERRPTYPE: | |
313 | /* | |
314 | * doerrp - print the arguments to stderr file | |
315 | * | |
316 | */ | |
317 | if (argc > 2) { | |
318 | for (n = 2; n < argc; n++) | |
319 | fprintf(stderr,"%s ", argv[n]); | |
320 | fprintf(stderr, "\n"); | |
321 | } | |
322 | break; | |
323 | ||
324 | case DNLNTYPE: | |
325 | /* | |
326 | * dodnl - eat-up-to and including newline | |
327 | * | |
328 | */ | |
329 | while ((c = gpbc()) != '\n' && c != EOF) | |
330 | ; | |
331 | break; | |
332 | ||
333 | case M4WRTYPE: | |
334 | /* | |
335 | * dom4wrap - set up for wrap-up/wind-down activity | |
336 | * | |
337 | */ | |
338 | m4wraps = (argc > 2) ? strsave(argv[2]) : null; | |
339 | break; | |
340 | ||
341 | case EXITTYPE: | |
342 | /* | |
343 | * doexit - immediate exit from m4. | |
344 | * | |
345 | */ | |
346 | exit((argc > 2) ? atoi(argv[2]) : 0); | |
347 | break; | |
348 | ||
349 | case DEFNTYPE: | |
350 | if (argc > 2) | |
351 | for (n = 2; n < argc; n++) | |
352 | dodefn(argv[n]); | |
353 | break; | |
354 | ||
355 | default: | |
356 | error("m4: major botch in eval."); | |
357 | break; | |
358 | } | |
359 | } |