Commit | Line | Data |
---|---|---|
ac72cd41 KS |
1 | # |
2 | ||
3 | #include "rcv.h" | |
4 | ||
5 | /* | |
6 | * Mail -- a mail program | |
7 | * | |
8 | * Lexical processing of commands. | |
9 | */ | |
10 | ||
11 | static char *SccsId = "@(#)lex.c 1.1 %G%"; | |
12 | ||
13 | /* | |
14 | * Interpret user commands one by one. If standard input is not a tty, | |
15 | * print no prompt. | |
16 | */ | |
17 | ||
18 | int *msgvec; | |
19 | ||
20 | commands() | |
21 | { | |
22 | int prompt, firstsw, stop(); | |
23 | register int n; | |
24 | char linebuf[LINESIZE]; | |
25 | ||
26 | msgvec = (int *) calloc((unsigned) (msgCount + 1), sizeof *msgvec); | |
27 | if (rcvmode) | |
28 | if (signal(SIGINT, SIG_IGN) == SIG_DFL) | |
29 | signal(SIGINT, stop); | |
30 | input = stdin; | |
31 | prompt = 1; | |
32 | if (!intty) | |
33 | prompt = 0; | |
34 | firstsw = 1; | |
35 | for (;;) { | |
36 | setexit(); | |
37 | if (firstsw > 0) { | |
38 | firstsw = 0; | |
39 | source1(mailrc); | |
40 | if (!nosrc) | |
41 | source1(MASTER); | |
42 | } | |
43 | ||
44 | /* | |
45 | * How's this for obscure: after we | |
46 | * finish sourcing for the first time, | |
47 | * go off and print the headers! | |
48 | */ | |
49 | ||
50 | if (firstsw == 0 && !sourcing) { | |
51 | firstsw = -1; | |
52 | if (rcvmode) | |
53 | announce(); | |
54 | } | |
55 | ||
56 | /* | |
57 | * Print the prompt, if needed. Clear out | |
58 | * string space, and flush the output. | |
59 | */ | |
60 | ||
61 | if (!rcvmode && !sourcing) | |
62 | return; | |
63 | if (prompt && !sourcing) | |
64 | printf("_\r"); | |
65 | flush(); | |
66 | sreset(); | |
67 | ||
68 | /* | |
69 | * Read a line of commands from the current input | |
70 | * and handle end of file specially. | |
71 | */ | |
72 | ||
73 | n = 0; | |
74 | for (;;) { | |
75 | if (readline(input, &linebuf[n]) <= 0) { | |
76 | if (n != 0) | |
77 | break; | |
78 | if (sourcing) { | |
79 | unstack(); | |
80 | goto more; | |
81 | } | |
82 | if (!edit) { | |
83 | signal(SIGINT, SIG_IGN); | |
84 | return; | |
85 | } | |
86 | edstop(); | |
87 | return; | |
88 | } | |
89 | if ((n = strlen(linebuf)) == 0) | |
90 | break; | |
91 | n--; | |
92 | if (linebuf[n] != '\\') | |
93 | break; | |
94 | linebuf[n++] = ' '; | |
95 | } | |
96 | if (execute(linebuf)) | |
97 | return; | |
98 | more: ; | |
99 | } | |
100 | } | |
101 | ||
102 | /* | |
103 | * Execute a single command. If the command executed | |
104 | * is "quit," then return non-zero so that the caller | |
105 | * will know to return back to main, if he cares. | |
106 | */ | |
107 | ||
108 | execute(linebuf) | |
109 | char linebuf[]; | |
110 | { | |
111 | char word[LINESIZE]; | |
112 | char *arglist[MAXARGC]; | |
113 | struct cmd *com; | |
114 | register char *cp, *cp2; | |
115 | register int c; | |
116 | int edstop(), e; | |
117 | ||
118 | /* | |
119 | * Strip the white space away from the beginning | |
120 | * of the command, then scan out a word, which | |
121 | * consists of anything except digits and white space. | |
122 | * | |
123 | * Handle ! escapes differently to get the correct | |
124 | * lexical conventions. | |
125 | */ | |
126 | ||
127 | cp = linebuf; | |
128 | while (any(*cp, " \t")) | |
129 | cp++; | |
130 | if (*cp == '!') { | |
131 | if (sourcing) { | |
132 | printf("Can't \"!\" while sourcing\n"); | |
133 | unstack(); | |
134 | return(0); | |
135 | } | |
136 | shell(cp+1); | |
137 | return(0); | |
138 | } | |
139 | cp2 = word; | |
140 | while (*cp && !any(*cp, " \t0123456789$^.-+*'\"")) | |
141 | *cp2++ = *cp++; | |
142 | *cp2 = '\0'; | |
143 | ||
144 | /* | |
145 | * Look up the command; if not found, bitch. | |
146 | * Normally, a blank command would map to the | |
147 | * first command in the table; while sourcing, | |
148 | * however, we ignore blank lines to eliminate | |
149 | * confusion. | |
150 | */ | |
151 | ||
152 | if (sourcing && equal(word, "")) | |
153 | return(0); | |
154 | com = lex(word); | |
155 | if (com == NONE) { | |
156 | printf("What?\n"); | |
157 | if (sourcing) | |
158 | unstack(); | |
159 | return(0); | |
160 | } | |
161 | ||
162 | /* | |
163 | * Special case so that quit causes a return to | |
164 | * main, who will call the quit code directly. | |
165 | * If we are in a source file, just unstack. | |
166 | */ | |
167 | ||
168 | if (com->c_func == edstop && sourcing) { | |
169 | unstack(); | |
170 | return(0); | |
171 | } | |
172 | if (!edit && com->c_func == edstop) { | |
173 | signal(SIGINT, SIG_IGN); | |
174 | return(1); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Process the arguments to the command, depending | |
179 | * on the type he expects. Default to an error. | |
180 | * If we are sourcing an interactive command, it's | |
181 | * an error. | |
182 | */ | |
183 | ||
184 | if (!rcvmode && (com->c_argtype & M) == 0) { | |
185 | printf("May not execute \"%s\" while sending\n", | |
186 | com->c_name); | |
187 | unstack(); | |
188 | return(0); | |
189 | } | |
190 | if (sourcing && com->c_argtype & I) { | |
191 | printf("May not execute \"%s\" while sourcing\n", | |
192 | com->c_name); | |
193 | unstack(); | |
194 | return(0); | |
195 | } | |
196 | e = 1; | |
197 | switch (com->c_argtype & ~(P|I|M)) { | |
198 | case MSGLIST: | |
199 | /* | |
200 | * A message list defaulting to nearest forward | |
201 | * legal message. | |
202 | */ | |
203 | if ((c = getmsglist(cp, msgvec, com->c_msgflag)) < 0) | |
204 | break; | |
205 | if (c == 0) { | |
206 | *msgvec = first(com->c_msgflag, | |
207 | com->c_msgmask); | |
208 | msgvec[1] = NULL; | |
209 | } | |
210 | if (*msgvec == NULL) { | |
211 | printf("No applicable messages\n"); | |
212 | break; | |
213 | } | |
214 | e = (*com->c_func)(msgvec); | |
215 | break; | |
216 | ||
217 | case NDMLIST: | |
218 | /* | |
219 | * A message list with no defaults, but no error | |
220 | * if none exist. | |
221 | */ | |
222 | if (getmsglist(cp, msgvec, com->c_msgflag) < 0) | |
223 | break; | |
224 | e = (*com->c_func)(msgvec); | |
225 | break; | |
226 | ||
227 | case STRLIST: | |
228 | /* | |
229 | * Just the straight string, with | |
230 | * leading blanks removed. | |
231 | */ | |
232 | while (any(*cp, " \t")) | |
233 | cp++; | |
234 | e = (*com->c_func)(cp); | |
235 | break; | |
236 | ||
237 | case RAWLIST: | |
238 | /* | |
239 | * A vector of strings, in shell style. | |
240 | */ | |
241 | if ((c = getrawlist(cp, arglist)) < 0) | |
242 | break; | |
243 | if (c < com->c_minargs) { | |
244 | printf("%s requires at least %d arg(s)\n", | |
245 | com->c_name, com->c_minargs); | |
246 | break; | |
247 | } | |
248 | if (c > com->c_maxargs) { | |
249 | printf("%s takes no more than %d arg(s)\n", | |
250 | com->c_name, com->c_maxargs); | |
251 | break; | |
252 | } | |
253 | e = (*com->c_func)(arglist); | |
254 | break; | |
255 | ||
256 | case NOLIST: | |
257 | /* | |
258 | * Just the constant zero, for exiting, | |
259 | * eg. | |
260 | */ | |
261 | e = (*com->c_func)(0); | |
262 | break; | |
263 | ||
264 | default: | |
265 | panic("Unknown argtype"); | |
266 | } | |
267 | ||
268 | /* | |
269 | * Exit the current source file on | |
270 | * error. | |
271 | */ | |
272 | ||
273 | if (e && sourcing) | |
274 | unstack(); | |
275 | if (com->c_func == edstop) | |
276 | return(1); | |
277 | if (value("autoprint") != NOSTR && com->c_argtype & P) | |
278 | if ((dot->m_flag & MDELETED) == 0) | |
279 | print(dot); | |
280 | if (!sourcing) | |
281 | sawcom = 1; | |
282 | return(0); | |
283 | } | |
284 | ||
285 | /* | |
286 | * Find the correct command in the command table corresponding | |
287 | * to the passed command "word" | |
288 | */ | |
289 | ||
290 | struct cmd * | |
291 | lex(word) | |
292 | char word[]; | |
293 | { | |
294 | register struct cmd *cp; | |
295 | extern struct cmd cmdtab[]; | |
296 | ||
297 | for (cp = &cmdtab[0]; cp->c_name != NOSTR; cp++) | |
298 | if (isprefix(word, cp->c_name)) | |
299 | return(cp); | |
300 | return(NONE); | |
301 | } | |
302 | ||
303 | /* | |
304 | * Determine if as1 is a valid prefix of as2. | |
305 | * Return true if yep. | |
306 | */ | |
307 | ||
308 | isprefix(as1, as2) | |
309 | char *as1, *as2; | |
310 | { | |
311 | register char *s1, *s2; | |
312 | ||
313 | s1 = as1; | |
314 | s2 = as2; | |
315 | while (*s1++ == *s2) | |
316 | if (*s2++ == '\0') | |
317 | return(1); | |
318 | return(*--s1 == '\0'); | |
319 | } | |
320 | ||
321 | /* | |
322 | * The following gets called on receipt of a rubout. This is | |
323 | * to abort printout of a command, mainly. | |
324 | * Dispatching here when command() is inactive crashes rcv. | |
325 | * Close all open files except 0, 1, 2, and the temporary. | |
326 | * The special call to getuserid() is needed so it won't get | |
327 | * annoyed about losing its open file. | |
328 | * Also, unstack all source files. | |
329 | */ | |
330 | ||
331 | stop() | |
332 | { | |
333 | register FILE *fp; | |
334 | ||
335 | noreset = 0; | |
336 | signal(SIGINT, SIG_IGN); | |
337 | sawcom++; | |
338 | while (sourcing) | |
339 | unstack(); | |
340 | getuserid((char *) -1); | |
341 | for (fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) { | |
342 | if (fp == stdin || fp == stdout) | |
343 | continue; | |
344 | if (fp == itf || fp == otf) | |
345 | continue; | |
346 | if (fp == stderr) | |
347 | continue; | |
348 | fclose(fp); | |
349 | } | |
350 | if (image >= 0) { | |
351 | close(image); | |
352 | image = -1; | |
353 | } | |
354 | clrbuf(stdout); | |
355 | printf("Interrupt\n"); | |
356 | signal(SIGINT, stop); | |
357 | reset(0); | |
358 | } | |
359 | ||
360 | /* | |
361 | * Announce the presence of the current Mail version, | |
362 | * give the message count, and print a header listing. | |
363 | */ | |
364 | ||
365 | char *greeting = "Mail version 2.0 %s. Type ? for help.\n"; | |
366 | ||
367 | announce() | |
368 | { | |
369 | int vec[2]; | |
370 | extern char *version; | |
371 | register struct message *mp; | |
372 | ||
373 | if (value("hold") != NOSTR) | |
374 | for (mp = &message[0]; mp < &message[msgCount]; mp++) | |
375 | mp->m_flag |= MPRESERVE; | |
376 | vec[0] = 1; | |
377 | vec[1] = 0; | |
378 | if (value("quiet") == NOSTR) | |
379 | printf(greeting, version); | |
380 | if (msgCount == 1) | |
381 | printf("1 message:\n"); | |
382 | else | |
383 | printf("%d messages:\n", msgCount); | |
384 | headers(vec); | |
385 | } | |
386 | ||
387 | strace() {} | |
388 | ||
389 | /* | |
390 | * Print the current version number. | |
391 | */ | |
392 | ||
393 | pversion(e) | |
394 | { | |
395 | printf(greeting, version); | |
396 | return(0); | |
397 | } |