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2791ff57 KB |
1 | /*- |
2 | * Copyright (c) 1980 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * %sccs.include.proprietary.c% | |
19d73a0e DF |
6 | */ |
7 | ||
8 | #ifndef lint | |
2791ff57 KB |
9 | char copyright[] = |
10 | "@(#) Copyright (c) 1980 The Regents of the University of California.\n\ | |
19d73a0e | 11 | All rights reserved.\n"; |
2791ff57 | 12 | #endif /* not lint */ |
19d73a0e DF |
13 | |
14 | #ifndef lint | |
2791ff57 KB |
15 | static char sccsid[] = "@(#)ex.c 7.9 (Berkeley) %G%"; |
16 | #endif /* not lint */ | |
19d73a0e | 17 | |
fe4130ee MH |
18 | #include "ex.h" |
19 | #include "ex_argv.h" | |
20 | #include "ex_temp.h" | |
21 | #include "ex_tty.h" | |
435e8dff | 22 | #include "pathnames.h" |
fe4130ee MH |
23 | |
24 | #ifdef TRACE | |
5a6c967e CH |
25 | #ifdef vms |
26 | char tttrace[] = { 't','r','a','c','e','.','l','i','s' }; | |
27 | #else | |
fe4130ee MH |
28 | char tttrace[] = { '/','d','e','v','/','t','t','y','x','x',0 }; |
29 | #endif | |
5a6c967e | 30 | #endif |
fe4130ee MH |
31 | |
32 | /* | |
33 | * The code for ex is divided as follows: | |
34 | * | |
35 | * ex.c Entry point and routines handling interrupt, hangup | |
36 | * signals; initialization code. | |
37 | * | |
38 | * ex_addr.c Address parsing routines for command mode decoding. | |
39 | * Routines to set and check address ranges on commands. | |
40 | * | |
41 | * ex_cmds.c Command mode command decoding. | |
42 | * | |
43 | * ex_cmds2.c Subroutines for command decoding and processing of | |
44 | * file names in the argument list. Routines to print | |
45 | * messages and reset state when errors occur. | |
46 | * | |
47 | * ex_cmdsub.c Subroutines which implement command mode functions | |
48 | * such as append, delete, join. | |
49 | * | |
50 | * ex_data.c Initialization of options. | |
51 | * | |
52 | * ex_get.c Command mode input routines. | |
53 | * | |
54 | * ex_io.c General input/output processing: file i/o, unix | |
55 | * escapes, filtering, source commands, preserving | |
56 | * and recovering. | |
57 | * | |
58 | * ex_put.c Terminal driving and optimizing routines for low-level | |
59 | * output (cursor-positioning); output line formatting | |
60 | * routines. | |
61 | * | |
62 | * ex_re.c Global commands, substitute, regular expression | |
63 | * compilation and execution. | |
64 | * | |
65 | * ex_set.c The set command. | |
66 | * | |
67 | * ex_subr.c Loads of miscellaneous subroutines. | |
68 | * | |
69 | * ex_temp.c Editor buffer routines for main buffer and also | |
70 | * for named buffers (Q registers if you will.) | |
71 | * | |
72 | * ex_tty.c Terminal dependent initializations from termcap | |
73 | * data base, grabbing of tty modes (at beginning | |
74 | * and after escapes). | |
75 | * | |
d266c416 MH |
76 | * ex_unix.c Routines for the ! command and its variations. |
77 | * | |
fe4130ee MH |
78 | * ex_v*.c Visual/open mode routines... see ex_v.c for a |
79 | * guide to the overall organization. | |
80 | */ | |
81 | ||
82 | /* | |
83 | * Main procedure. Process arguments and then | |
84 | * transfer control to the main command processing loop | |
d266c416 MH |
85 | * in the routine commands. We are entered as either "ex", "edit", "vi" |
86 | * or "view" and the distinction is made here. Actually, we are "vi" if | |
87 | * there is a 'v' in our name, "view" is there is a 'w', and "edit" if | |
88 | * there is a 'd' in our name. For edit we just diddle options; | |
89 | * for vi we actually force an early visual command. | |
fe4130ee MH |
90 | */ |
91 | main(ac, av) | |
92 | register int ac; | |
93 | register char *av[]; | |
94 | { | |
5a6c967e | 95 | #ifdef EXSTRINGS |
fe4130ee | 96 | char *erpath = EXSTRINGS; |
44232d5b | 97 | #endif |
fe4130ee MH |
98 | register char *cp; |
99 | register int c; | |
100 | bool recov = 0; | |
101 | bool ivis; | |
102 | bool itag = 0; | |
103 | bool fast = 0; | |
b61c5edc | 104 | extern void onemt(); |
5a6c967e CH |
105 | #ifdef UNIX_SBRK |
106 | extern char *sbrk(); | |
107 | #else | |
108 | extern char *malloc(); | |
109 | #endif | |
fe4130ee MH |
110 | #ifdef TRACE |
111 | register char *tracef; | |
112 | #endif | |
5a6c967e CH |
113 | #ifdef vms |
114 | char termtype[20]; | |
115 | #endif | |
fe4130ee MH |
116 | |
117 | /* | |
118 | * Immediately grab the tty modes so that we wont | |
119 | * get messed up if an interrupt comes in quickly. | |
120 | */ | |
5a6c967e | 121 | ex_gTTY(1); |
d266c416 | 122 | #ifndef USG3TTY |
fe4130ee | 123 | normf = tty.sg_flags; |
d266c416 MH |
124 | #else |
125 | normf = tty; | |
126 | #endif | |
fe4130ee MH |
127 | ppid = getpid(); |
128 | /* | |
d266c416 | 129 | * Defend against d's, v's, w's, and a's in directories of |
fe4130ee MH |
130 | * path leading to our true name. |
131 | */ | |
5a6c967e | 132 | #ifndef vms |
fe4130ee | 133 | av[0] = tailpath(av[0]); |
5a6c967e CH |
134 | #else |
135 | /* | |
136 | * This program has to be invoked by using the following | |
137 | * string definitions: | |
138 | * | |
139 | * vi == "$dir:ex.exe vi" | |
140 | * view == "$dir:ex.exe view" | |
141 | * ex == "$dir:ex.exe ex" | |
142 | * edit == "$dir:ex.exe edit" | |
143 | */ | |
144 | ac--; | |
145 | av++; | |
146 | #endif | |
fe4130ee MH |
147 | |
148 | /* | |
d266c416 | 149 | * Figure out how we were invoked: ex, edit, vi, view. |
fe4130ee | 150 | */ |
d266c416 MH |
151 | ivis = any('v', av[0]); /* "vi" */ |
152 | if (any('w', av[0])) /* "view" */ | |
153 | value(READONLY) = 1; | |
154 | if (any('d', av[0])) { /* "edit" */ | |
fe4130ee MH |
155 | value(OPEN) = 0; |
156 | value(REPORT) = 1; | |
157 | value(MAGIC) = 0; | |
158 | } | |
159 | ||
5a6c967e | 160 | #ifdef EXSTRINGS |
d266c416 MH |
161 | /* |
162 | * For debugging take files out of . if name is a.out. | |
163 | */ | |
164 | if (av[0][0] == 'a') | |
165 | erpath = tailpath(erpath); | |
166 | #endif | |
fe4130ee MH |
167 | /* |
168 | * Open the error message file. | |
169 | */ | |
170 | draino(); | |
5a6c967e | 171 | #ifdef EXSTRINGS |
fe4130ee MH |
172 | erfile = open(erpath+4, 0); |
173 | if (erfile < 0) { | |
174 | erfile = open(erpath, 0); | |
175 | } | |
44232d5b | 176 | #endif |
fe4130ee MH |
177 | pstop(); |
178 | ||
179 | /* | |
180 | * Initialize interrupt handling. | |
181 | */ | |
182 | oldhup = signal(SIGHUP, SIG_IGN); | |
183 | if (oldhup == SIG_DFL) | |
184 | signal(SIGHUP, onhup); | |
185 | oldquit = signal(SIGQUIT, SIG_IGN); | |
186 | ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL; | |
187 | if (signal(SIGTERM, SIG_IGN) == SIG_DFL) | |
188 | signal(SIGTERM, onhup); | |
12fef7d9 MH |
189 | if (signal(SIGEMT, SIG_IGN) == SIG_DFL) |
190 | signal(SIGEMT, onemt); | |
fe4130ee | 191 | |
fe4130ee MH |
192 | /* |
193 | * Process flag arguments. | |
194 | */ | |
195 | ac--, av++; | |
196 | while (ac && av[0][0] == '-') { | |
197 | c = av[0][1]; | |
198 | if (c == 0) { | |
199 | hush = 1; | |
200 | value(AUTOPRINT) = 0; | |
201 | fast++; | |
202 | } else switch (c) { | |
203 | ||
d266c416 MH |
204 | case 'R': |
205 | value(READONLY) = 1; | |
206 | break; | |
207 | ||
fe4130ee MH |
208 | #ifdef TRACE |
209 | case 'T': | |
210 | if (av[0][2] == 0) | |
211 | tracef = "trace"; | |
212 | else { | |
213 | tracef = tttrace; | |
214 | tracef[8] = av[0][2]; | |
215 | if (tracef[8]) | |
216 | tracef[9] = av[0][3]; | |
217 | else | |
218 | tracef[9] = 0; | |
219 | } | |
220 | trace = fopen(tracef, "w"); | |
299f2784 | 221 | #define tracbuf NULL |
fe4130ee | 222 | if (trace == NULL) |
5a6c967e | 223 | ex_printf("Trace create error\n"); |
299f2784 MH |
224 | else |
225 | setbuf(trace, tracbuf); | |
fe4130ee MH |
226 | break; |
227 | ||
228 | #endif | |
229 | ||
230 | #ifdef LISPCODE | |
231 | case 'l': | |
232 | value(LISP) = 1; | |
233 | value(SHOWMATCH) = 1; | |
234 | break; | |
235 | #endif | |
236 | ||
237 | case 'r': | |
238 | recov++; | |
239 | break; | |
240 | ||
241 | case 't': | |
242 | if (ac > 1 && av[1][0] != '-') { | |
243 | ac--, av++; | |
244 | itag = 1; | |
245 | /* BUG: should check for too long tag. */ | |
246 | CP(lasttag, av[0]); | |
247 | } | |
248 | break; | |
249 | ||
250 | case 'v': | |
251 | ivis = 1; | |
252 | break; | |
253 | ||
254 | case 'w': | |
255 | defwind = 0; | |
256 | if (av[0][2] == 0) defwind = 3; | |
257 | else for (cp = &av[0][2]; isdigit(*cp); cp++) | |
258 | defwind = 10*defwind + *cp - '0'; | |
259 | break; | |
260 | ||
d266c416 | 261 | |
fe4130ee MH |
262 | default: |
263 | smerror("Unknown option %s\n", av[0]); | |
264 | break; | |
265 | } | |
266 | ac--, av++; | |
267 | } | |
04379bab MH |
268 | |
269 | #ifdef SIGTSTP | |
270 | if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL) | |
271 | signal(SIGTSTP, onsusp), dosusp++; | |
272 | #endif | |
273 | ||
fe4130ee MH |
274 | if (ac && av[0][0] == '+') { |
275 | firstpat = &av[0][1]; | |
276 | ac--, av++; | |
277 | } | |
278 | ||
d266c416 | 279 | |
fe4130ee MH |
280 | /* |
281 | * If we are doing a recover and no filename | |
282 | * was given, then execute an exrecover command with | |
283 | * the -r option to type out the list of saved file names. | |
284 | * Otherwise set the remembered file name to the first argument | |
285 | * file name so the "recover" initial command will find it. | |
286 | */ | |
287 | if (recov) { | |
288 | if (ac == 0) { | |
289 | ppid = 0; | |
290 | setrupt(); | |
435e8dff KB |
291 | execl(_PATH_EXRECOVER, "exrecover", "-r", 0); |
292 | filioerr(_PATH_EXRECOVER); | |
5a6c967e | 293 | ex_exit(1); |
fe4130ee MH |
294 | } |
295 | CP(savedfile, *av++), ac--; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Initialize the argument list. | |
300 | */ | |
301 | argv0 = av; | |
302 | argc0 = ac; | |
303 | args0 = av[0]; | |
304 | erewind(); | |
305 | ||
306 | /* | |
307 | * Initialize a temporary file (buffer) and | |
308 | * set up terminal environment. Read user startup commands. | |
309 | */ | |
fe4130ee MH |
310 | if (setexit() == 0) { |
311 | setrupt(); | |
312 | intty = isatty(0); | |
313 | value(PROMPT) = intty; | |
5a6c967e | 314 | #ifndef vms |
d266c416 | 315 | if (cp = getenv("SHELL")) |
5a6c967e CH |
316 | #else |
317 | if (cp = getlog("SHELL")) | |
318 | #endif | |
d266c416 | 319 | CP(shell, cp); |
fe4130ee MH |
320 | if (fast || !intty) |
321 | setterm("dumb"); | |
322 | else { | |
323 | gettmode(); | |
5a6c967e | 324 | #ifndef vms |
d266c416 | 325 | if ((cp = getenv("TERM")) != 0 && *cp) |
fe4130ee | 326 | setterm(cp); |
5a6c967e CH |
327 | #else |
328 | if ((cp = getlog("TERM")) != 0 && *cp) { | |
329 | /* | |
330 | * Can't just use it directly since getlog | |
331 | * returns a pointer to a static buffer that | |
332 | * tgetent() will eventually use | |
333 | */ | |
334 | CP(termtype, cp); | |
335 | setterm(termtype); | |
336 | } | |
337 | #endif | |
fe4130ee MH |
338 | } |
339 | } | |
299f2784 | 340 | if (setexit() == 0 && !fast && intty) { |
5a6c967e | 341 | #ifndef vms |
d266c416 | 342 | if ((globp = getenv("EXINIT")) && *globp) |
5a6c967e CH |
343 | #else |
344 | if ((globp = getlog("EXINIT")) && *globp) | |
345 | #endif | |
fe4130ee | 346 | commands(1,1); |
d266c416 MH |
347 | else { |
348 | globp = 0; | |
54869f35 JB |
349 | if ((cp = getenv("HOME")) != 0 && *cp) { |
350 | (void) strcat(strcpy(genbuf, cp), "/.exrc"); | |
351 | if (iownit(genbuf)) | |
352 | source(genbuf, 1); | |
353 | } | |
d266c416 | 354 | } |
299f2784 MH |
355 | /* |
356 | * Allow local .exrc too. This loses if . is $HOME, | |
357 | * but nobody should notice unless they do stupid things | |
358 | * like putting a version command in .exrc. Besides, | |
359 | * they should be using EXINIT, not .exrc, right? | |
360 | */ | |
54869f35 JB |
361 | if (iownit(".exrc")) |
362 | source(".exrc", 1); | |
299f2784 | 363 | } |
5a6c967e CH |
364 | #ifdef UNIX_SBRK |
365 | /* | |
366 | * Initialize end of core pointers. | |
367 | * Normally we avoid breaking back to fendcore after each | |
368 | * file since this can be expensive (much core-core copying). | |
369 | * If your system can scatter load processes you could do | |
370 | * this as ed does, saving a little core, but it will probably | |
371 | * not often make much difference. | |
372 | */ | |
373 | fendcore = (line *) sbrk(0); | |
374 | endcore = fendcore - 2; | |
375 | #else | |
376 | /* | |
377 | * Allocate all the memory we will ever use in one chunk. | |
378 | * This is for system such as VMS where sbrk() does not | |
379 | * guarantee that the memory allocated beyond the end is | |
380 | * consecutive. VMS's RMS does all sorts of memory allocation | |
381 | * and screwed up ex royally because ex assumes that all | |
382 | * memory up to "endcore" belongs to it and RMS has different | |
383 | * ideas. | |
384 | */ | |
385 | fendcore = (line *) malloc((unsigned) | |
386 | value(LINELIMIT) * sizeof (line *)); | |
387 | if (fendcore == NULL) { | |
388 | lprintf("ex: cannot handle %d lines\n", value(LINELIMIT)); | |
389 | lprintf("ex: set \"linelimit\" lower\n"); | |
390 | flush(); | |
391 | ex_exit(1); | |
392 | } | |
393 | endcore = fendcore + (value(LINELIMIT) - 1); | |
394 | #endif | |
04379bab | 395 | init(); /* moved after prev 2 chunks to fix directory option */ |
fe4130ee MH |
396 | |
397 | /* | |
398 | * Initial processing. Handle tag, recover, and file argument | |
399 | * implied next commands. If going in as 'vi', then don't do | |
400 | * anything, just set initev so we will do it later (from within | |
401 | * visual). | |
402 | */ | |
403 | if (setexit() == 0) { | |
404 | if (recov) | |
405 | globp = "recover"; | |
406 | else if (itag) | |
407 | globp = ivis ? "tag" : "tag|p"; | |
408 | else if (argc) | |
409 | globp = "next"; | |
410 | if (ivis) | |
411 | initev = globp; | |
412 | else if (globp) { | |
413 | inglobal = 1; | |
414 | commands(1, 1); | |
415 | inglobal = 0; | |
416 | } | |
417 | } | |
418 | ||
419 | /* | |
420 | * Vi command... go into visual. | |
421 | * Strange... everything in vi usually happens | |
422 | * before we ever "start". | |
423 | */ | |
424 | if (ivis) { | |
425 | /* | |
426 | * Don't have to be upward compatible with stupidity | |
427 | * of starting editing at line $. | |
428 | */ | |
429 | if (dol > zero) | |
430 | dot = one; | |
431 | globp = "visual"; | |
432 | if (setexit() == 0) | |
433 | commands(1, 1); | |
434 | } | |
435 | ||
436 | /* | |
437 | * Clear out trash in state accumulated by startup, | |
438 | * and then do the main command loop for a normal edit. | |
439 | * If you quit out of a 'vi' command by doing Q or ^\, | |
440 | * you also fall through to here. | |
441 | */ | |
04379bab | 442 | seenprompt = 1; |
fe4130ee MH |
443 | ungetchar(0); |
444 | globp = 0; | |
445 | initev = 0; | |
446 | setlastchar('\n'); | |
447 | setexit(); | |
448 | commands(0, 0); | |
449 | cleanup(1); | |
5a6c967e | 450 | ex_exit(0); |
fe4130ee MH |
451 | } |
452 | ||
453 | /* | |
454 | * Initialization, before editing a new file. | |
455 | * Main thing here is to get a new buffer (in fileinit), | |
456 | * rest is peripheral state resetting. | |
457 | */ | |
458 | init() | |
459 | { | |
460 | register int i; | |
461 | ||
462 | fileinit(); | |
463 | dot = zero = truedol = unddol = dol = fendcore; | |
464 | one = zero+1; | |
465 | undkind = UNDNONE; | |
466 | chng = 0; | |
467 | edited = 0; | |
468 | for (i = 0; i <= 'z'-'a'+1; i++) | |
469 | names[i] = 1; | |
470 | anymarks = 0; | |
471 | } | |
472 | ||
fe4130ee MH |
473 | /* |
474 | * Return last component of unix path name p. | |
475 | */ | |
476 | char * | |
477 | tailpath(p) | |
478 | register char *p; | |
479 | { | |
480 | register char *r; | |
481 | ||
482 | for (r=p; *p; p++) | |
483 | if (*p == '/') | |
484 | r = p+1; | |
485 | return(r); | |
486 | } | |
54869f35 JB |
487 | |
488 | /* | |
489 | * Check ownership of file. Return nonzero if it exists and is owned by the | |
490 | * user or the option sourceany is used | |
491 | */ | |
492 | iownit(file) | |
493 | char *file; | |
494 | { | |
495 | struct stat sb; | |
496 | ||
497 | if (stat(file, &sb) == 0 && (value(SOURCEANY) || sb.st_uid == getuid())) | |
498 | return(1); | |
499 | else | |
500 | return(0); | |
501 | } |