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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 | * | |
6ecf3d85 | 8 | * %sccs.include.redist.c% |
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9 | */ |
10 | ||
11 | #ifndef lint | |
50841d34 | 12 | static char sccsid[] = "@(#)eval.c 5.4 (Berkeley) %G%"; |
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13 | #endif /* not lint */ |
14 | ||
15 | /* | |
16 | * eval.c | |
17 | * Facility: m4 macro processor | |
18 | * by: oz | |
19 | */ | |
20 | ||
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21 | #include <unistd.h> |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
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25 | #include "mdef.h" |
26 | #include "extr.h" | |
27 | ||
28 | extern ndptr lookup(); | |
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29 | |
30 | /* | |
31 | * eval - evaluate built-in macros. | |
32 | * argc - number of elements in argv. | |
33 | * argv - element vector : | |
34 | * argv[0] = definition of a user | |
35 | * macro or nil if built-in. | |
36 | * argv[1] = name of the macro or | |
37 | * built-in. | |
38 | * argv[2] = parameters to user-defined | |
39 | * . macro or built-in. | |
40 | * . | |
41 | * | |
42 | * Note that the minimum value for argc is 3. A call in the form | |
43 | * of macro-or-builtin() will result in: | |
44 | * argv[0] = nullstr | |
45 | * argv[1] = macro-or-builtin | |
46 | * argv[2] = nullstr | |
47 | * | |
48 | */ | |
49 | ||
50 | eval (argv, argc, td) | |
51 | register char *argv[]; | |
52 | register int argc; | |
53 | register int td; | |
54 | { | |
55 | register int c, n; | |
56 | static int sysval; | |
57 | ||
58 | #ifdef DEBUG | |
59 | printf("argc = %d\n", argc); | |
60 | for (n = 0; n < argc; n++) | |
61 | printf("argv[%d] = %s\n", n, argv[n]); | |
62 | #endif | |
63 | /* | |
64 | * if argc == 3 and argv[2] is null, | |
65 | * then we have macro-or-builtin() type call. | |
66 | * We adjust argc to avoid further checking.. | |
67 | * | |
68 | */ | |
69 | if (argc == 3 && !*(argv[2])) | |
70 | argc--; | |
71 | ||
72 | switch (td & ~STATIC) { | |
73 | ||
74 | case DEFITYPE: | |
75 | if (argc > 2) | |
76 | dodefine(argv[2], (argc > 3) ? argv[3] : null); | |
77 | break; | |
78 | ||
79 | case PUSDTYPE: | |
80 | if (argc > 2) | |
81 | dopushdef(argv[2], (argc > 3) ? argv[3] : null); | |
82 | break; | |
83 | ||
84 | case DUMPTYPE: | |
85 | dodump(argv, argc); | |
86 | break; | |
87 | ||
88 | case EXPRTYPE: | |
89 | /* | |
90 | * doexpr - evaluate arithmetic expression | |
91 | * | |
92 | */ | |
93 | if (argc > 2) | |
94 | pbnum(expr(argv[2])); | |
95 | break; | |
96 | ||
97 | case IFELTYPE: | |
98 | if (argc > 4) | |
99 | doifelse(argv, argc); | |
100 | break; | |
101 | ||
102 | case IFDFTYPE: | |
103 | /* | |
104 | * doifdef - select one of two alternatives based | |
105 | * on the existence of another definition | |
106 | */ | |
107 | if (argc > 3) { | |
108 | if (lookup(argv[2]) != nil) | |
109 | pbstr(argv[3]); | |
110 | else if (argc > 4) | |
111 | pbstr(argv[4]); | |
112 | } | |
113 | break; | |
114 | ||
115 | case LENGTYPE: | |
116 | /* | |
117 | * dolen - find the length of the argument | |
118 | * | |
119 | */ | |
120 | if (argc > 2) | |
121 | pbnum((argc > 2) ? strlen(argv[2]) : 0); | |
122 | break; | |
123 | ||
124 | case INCRTYPE: | |
125 | /* | |
126 | * doincr - increment the value of the argument | |
127 | * | |
128 | */ | |
129 | if (argc > 2) | |
130 | pbnum(atoi(argv[2]) + 1); | |
131 | break; | |
132 | ||
133 | case DECRTYPE: | |
134 | /* | |
135 | * dodecr - decrement the value of the argument | |
136 | * | |
137 | */ | |
138 | if (argc > 2) | |
139 | pbnum(atoi(argv[2]) - 1); | |
140 | break; | |
141 | ||
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142 | case SYSCTYPE: |
143 | /* | |
144 | * dosys - execute system command | |
145 | * | |
146 | */ | |
147 | if (argc > 2) | |
148 | sysval = system(argv[2]); | |
149 | break; | |
150 | ||
151 | case SYSVTYPE: | |
152 | /* | |
153 | * dosysval - return value of the last system call. | |
154 | * | |
155 | */ | |
156 | pbnum(sysval); | |
157 | break; | |
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158 | |
159 | case INCLTYPE: | |
160 | if (argc > 2) | |
161 | if (!doincl(argv[2])) { | |
162 | fprintf(stderr,"m4: %s: ",argv[2]); | |
163 | error("cannot open for read."); | |
164 | } | |
165 | break; | |
166 | ||
167 | case SINCTYPE: | |
168 | if (argc > 2) | |
169 | (void) doincl(argv[2]); | |
170 | break; | |
171 | #ifdef EXTENDED | |
172 | case PASTTYPE: | |
173 | if (argc > 2) | |
174 | if (!dopaste(argv[2])) { | |
175 | fprintf(stderr,"m4: %s: ",argv[2]); | |
176 | error("cannot open for read."); | |
177 | } | |
178 | break; | |
179 | ||
180 | case SPASTYPE: | |
181 | if (argc > 2) | |
182 | (void) dopaste(argv[2]); | |
183 | break; | |
184 | #endif | |
185 | case CHNQTYPE: | |
186 | dochq(argv, argc); | |
187 | break; | |
188 | ||
189 | case CHNCTYPE: | |
190 | dochc(argv, argc); | |
191 | break; | |
192 | ||
193 | case SUBSTYPE: | |
194 | /* | |
195 | * dosub - select substring | |
196 | * | |
197 | */ | |
198 | if (argc > 3) | |
199 | dosub(argv,argc); | |
200 | break; | |
201 | ||
202 | case SHIFTYPE: | |
203 | /* | |
204 | * doshift - push back all arguments except the | |
205 | * first one (i.e. skip argv[2]) | |
206 | */ | |
207 | if (argc > 3) { | |
208 | for (n = argc-1; n > 3; n--) { | |
209 | putback(rquote); | |
210 | pbstr(argv[n]); | |
211 | putback(lquote); | |
212 | putback(','); | |
213 | } | |
214 | putback(rquote); | |
215 | pbstr(argv[3]); | |
216 | putback(lquote); | |
217 | } | |
218 | break; | |
219 | ||
220 | case DIVRTYPE: | |
221 | if (argc > 2 && (n = atoi(argv[2])) != 0) | |
222 | dodiv(n); | |
223 | else { | |
224 | active = stdout; | |
225 | oindex = 0; | |
226 | } | |
227 | break; | |
228 | ||
229 | case UNDVTYPE: | |
230 | doundiv(argv, argc); | |
231 | break; | |
232 | ||
233 | case DIVNTYPE: | |
234 | /* | |
235 | * dodivnum - return the number of current | |
236 | * output diversion | |
237 | * | |
238 | */ | |
239 | pbnum(oindex); | |
240 | break; | |
241 | ||
242 | case UNDFTYPE: | |
243 | /* | |
244 | * doundefine - undefine a previously defined | |
245 | * macro(s) or m4 keyword(s). | |
246 | */ | |
247 | if (argc > 2) | |
248 | for (n = 2; n < argc; n++) | |
249 | remhash(argv[n], ALL); | |
250 | break; | |
251 | ||
252 | case POPDTYPE: | |
253 | /* | |
254 | * dopopdef - remove the topmost definitions of | |
255 | * macro(s) or m4 keyword(s). | |
256 | */ | |
257 | if (argc > 2) | |
258 | for (n = 2; n < argc; n++) | |
259 | remhash(argv[n], TOP); | |
260 | break; | |
261 | ||
262 | case MKTMTYPE: | |
263 | /* | |
264 | * dotemp - create a temporary file | |
265 | * | |
266 | */ | |
267 | if (argc > 2) | |
268 | pbstr(mktemp(argv[2])); | |
269 | break; | |
270 | ||
271 | case TRNLTYPE: | |
272 | /* | |
273 | * dotranslit - replace all characters in the | |
274 | * source string that appears in | |
275 | * the "from" string with the corresponding | |
276 | * characters in the "to" string. | |
277 | * | |
278 | */ | |
279 | if (argc > 3) { | |
280 | char temp[MAXTOK]; | |
281 | if (argc > 4) | |
282 | map(temp, argv[2], argv[3], argv[4]); | |
283 | else | |
284 | map(temp, argv[2], argv[3], null); | |
285 | pbstr(temp); | |
286 | } | |
287 | else | |
288 | if (argc > 2) | |
289 | pbstr(argv[2]); | |
290 | break; | |
291 | ||
292 | case INDXTYPE: | |
293 | /* | |
294 | * doindex - find the index of the second argument | |
295 | * string in the first argument string. | |
296 | * -1 if not present. | |
297 | */ | |
298 | pbnum((argc > 3) ? indx(argv[2], argv[3]) : -1); | |
299 | break; | |
300 | ||
301 | case ERRPTYPE: | |
302 | /* | |
303 | * doerrp - print the arguments to stderr file | |
304 | * | |
305 | */ | |
306 | if (argc > 2) { | |
307 | for (n = 2; n < argc; n++) | |
308 | fprintf(stderr,"%s ", argv[n]); | |
309 | fprintf(stderr, "\n"); | |
310 | } | |
311 | break; | |
312 | ||
313 | case DNLNTYPE: | |
314 | /* | |
315 | * dodnl - eat-up-to and including newline | |
316 | * | |
317 | */ | |
318 | while ((c = gpbc()) != '\n' && c != EOF) | |
319 | ; | |
320 | break; | |
321 | ||
322 | case M4WRTYPE: | |
323 | /* | |
324 | * dom4wrap - set up for wrap-up/wind-down activity | |
325 | * | |
326 | */ | |
50841d34 | 327 | m4wraps = (argc > 2) ? strdup(argv[2]) : null; |
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328 | break; |
329 | ||
330 | case EXITTYPE: | |
331 | /* | |
332 | * doexit - immediate exit from m4. | |
333 | * | |
334 | */ | |
335 | exit((argc > 2) ? atoi(argv[2]) : 0); | |
336 | break; | |
337 | ||
338 | case DEFNTYPE: | |
339 | if (argc > 2) | |
340 | for (n = 2; n < argc; n++) | |
341 | dodefn(argv[n]); | |
342 | break; | |
343 | ||
344 | default: | |
345 | error("m4: major botch in eval."); | |
346 | break; | |
347 | } | |
348 | } |