File: | src/usr.bin/vi/build/../common/exf.c |
Warning: | line 1041, column 47 Dereference of null pointer |
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1 | /* $OpenBSD: exf.c,v 1.48 2021/10/25 14:17:24 dv Exp $ */ | |||
2 | ||||
3 | /*- | |||
4 | * Copyright (c) 1992, 1993, 1994 | |||
5 | * The Regents of the University of California. All rights reserved. | |||
6 | * Copyright (c) 1992, 1993, 1994, 1995, 1996 | |||
7 | * Keith Bostic. All rights reserved. | |||
8 | * | |||
9 | * See the LICENSE file for redistribution information. | |||
10 | */ | |||
11 | ||||
12 | #include "config.h" | |||
13 | ||||
14 | #include <sys/queue.h> | |||
15 | #include <sys/stat.h> | |||
16 | #include <sys/time.h> | |||
17 | ||||
18 | /* | |||
19 | * We include <sys/file.h>, because the flock(2) and open(2) #defines | |||
20 | * were found there on historical systems. We also include <fcntl.h> | |||
21 | * because the open(2) #defines are found there on newer systems. | |||
22 | */ | |||
23 | #include <sys/file.h> | |||
24 | ||||
25 | #include <bitstring.h> | |||
26 | #include <dirent.h> | |||
27 | #include <errno(*__errno()).h> | |||
28 | #include <fcntl.h> | |||
29 | #include <limits.h> | |||
30 | #include <signal.h> | |||
31 | #include <stdio.h> | |||
32 | #include <stdlib.h> | |||
33 | #include <string.h> | |||
34 | #include <time.h> | |||
35 | #include <unistd.h> | |||
36 | ||||
37 | #include "common.h" | |||
38 | ||||
39 | static int file_backup(SCR *, char *, char *); | |||
40 | static void file_cinit(SCR *); | |||
41 | static void file_comment(SCR *); | |||
42 | static int file_spath(SCR *, FREF *, struct stat *, int *); | |||
43 | ||||
44 | /* | |||
45 | * file_add -- | |||
46 | * Insert a file name into the FREF list, if it doesn't already | |||
47 | * appear in it. | |||
48 | * | |||
49 | * !!! | |||
50 | * The "if it doesn't already appear" changes vi's semantics slightly. If | |||
51 | * you do a "vi foo bar", and then execute "next bar baz", the edit of bar | |||
52 | * will reflect the line/column of the previous edit session. Historic nvi | |||
53 | * did not do this. The change is a logical extension of the change where | |||
54 | * vi now remembers the last location in any file that it has ever edited, | |||
55 | * not just the previously edited file. | |||
56 | * | |||
57 | * PUBLIC: FREF *file_add(SCR *, CHAR_T *); | |||
58 | */ | |||
59 | FREF * | |||
60 | file_add(SCR *sp, CHAR_T *name) | |||
61 | { | |||
62 | GS *gp; | |||
63 | FREF *frp, *tfrp; | |||
64 | ||||
65 | /* | |||
66 | * Return it if it already exists. Note that we test against the | |||
67 | * user's name, whatever that happens to be, including if it's a | |||
68 | * temporary file. | |||
69 | * | |||
70 | * If the user added a file but was unable to initialize it, there | |||
71 | * can be file list entries where the name field is NULL. Discard | |||
72 | * them the next time we see them. | |||
73 | */ | |||
74 | gp = sp->gp; | |||
75 | if (name != NULL((void *)0)) | |||
76 | TAILQ_FOREACH_SAFE(frp, &gp->frefq, q, tfrp)for ((frp) = ((&gp->frefq)->tqh_first); (frp) != (( void *)0) && ((tfrp) = ((frp)->q.tqe_next), 1); (frp ) = (tfrp)) { | |||
77 | if (frp->name == NULL((void *)0)) { | |||
78 | TAILQ_REMOVE(&gp->frefq, frp, q)do { if (((frp)->q.tqe_next) != ((void *)0)) (frp)->q.tqe_next ->q.tqe_prev = (frp)->q.tqe_prev; else (&gp->frefq )->tqh_last = (frp)->q.tqe_prev; *(frp)->q.tqe_prev = (frp)->q.tqe_next; ; ; } while (0); | |||
79 | free(frp->name); | |||
80 | free(frp); | |||
81 | continue; | |||
82 | } | |||
83 | if (!strcmp(frp->name, name)) | |||
84 | return (frp); | |||
85 | } | |||
86 | ||||
87 | /* Allocate and initialize the FREF structure. */ | |||
88 | CALLOC(sp, frp, 1, sizeof(FREF)){ if (((frp) = calloc((1), (sizeof(FREF)))) == ((void *)0)) msgq ((sp), M_SYSERR, ((void *)0)); }; | |||
89 | if (frp == NULL((void *)0)) | |||
90 | return (NULL((void *)0)); | |||
91 | ||||
92 | /* | |||
93 | * If no file name specified, or if the file name is a request | |||
94 | * for something temporary, file_init() will allocate the file | |||
95 | * name. Temporary files are always ignored. | |||
96 | */ | |||
97 | if (name != NULL((void *)0) && strcmp(name, TEMPORARY_FILE_STRING"/tmp") && | |||
98 | (frp->name = strdup(name)) == NULL((void *)0)) { | |||
99 | free(frp); | |||
100 | msgq(sp, M_SYSERR, NULL((void *)0)); | |||
101 | return (NULL((void *)0)); | |||
102 | } | |||
103 | ||||
104 | /* Append into the chain of file names. */ | |||
105 | TAILQ_INSERT_TAIL(&gp->frefq, frp, q)do { (frp)->q.tqe_next = ((void *)0); (frp)->q.tqe_prev = (&gp->frefq)->tqh_last; *(&gp->frefq)-> tqh_last = (frp); (&gp->frefq)->tqh_last = &(frp )->q.tqe_next; } while (0); | |||
106 | ||||
107 | return (frp); | |||
108 | } | |||
109 | ||||
110 | /* | |||
111 | * file_init -- | |||
112 | * Start editing a file, based on the FREF structure. If successsful, | |||
113 | * let go of any previous file. Don't release the previous file until | |||
114 | * absolutely sure we have the new one. | |||
115 | * | |||
116 | * PUBLIC: int file_init(SCR *, FREF *, char *, int); | |||
117 | */ | |||
118 | int | |||
119 | file_init(SCR *sp, FREF *frp, char *rcv_name, int flags) | |||
120 | { | |||
121 | EXF *ep; | |||
122 | RECNOINFO oinfo; | |||
123 | struct stat sb; | |||
124 | size_t psize; | |||
125 | int fd, exists, open_err, readonly; | |||
126 | char *oname, tname[] = "/tmp/vi.XXXXXXXXXX"; | |||
127 | ||||
128 | open_err = readonly = 0; | |||
129 | ||||
130 | /* | |||
131 | * If the file is a recovery file, let the recovery code handle it. | |||
132 | * Clear the FR_RECOVER flag first -- the recovery code does set up, | |||
133 | * and then calls us! If the recovery call fails, it's probably | |||
134 | * because the named file doesn't exist. So, move boldly forward, | |||
135 | * presuming that there's an error message the user will get to see. | |||
136 | */ | |||
137 | if (F_ISSET(frp, FR_RECOVER)(((frp)->flags) & ((0x0020)))) { | |||
138 | F_CLR(frp, FR_RECOVER)(((frp)->flags) &= ~((0x0020))); | |||
139 | if (rcv_read(sp, frp) == 0) | |||
140 | return (0); /* successful recovery */ | |||
141 | } | |||
142 | ||||
143 | /* | |||
144 | * Required FRP initialization; the only flag we keep is the | |||
145 | * cursor information. | |||
146 | */ | |||
147 | F_CLR(frp, ~FR_CURSORSET)(((frp)->flags) &= ~((~0x0001))); | |||
148 | ||||
149 | /* | |||
150 | * Required EXF initialization: | |||
151 | * Flush the line caches. | |||
152 | * Default recover mail file fd to -1. | |||
153 | * Set initial EXF flag bits. | |||
154 | */ | |||
155 | CALLOC_RET(sp, ep, 1, sizeof(EXF)){ if (((ep) = calloc((1), (sizeof(EXF)))) == ((void *)0)) { msgq ((sp), M_SYSERR, ((void *)0)); return (1); } }; | |||
156 | ep->c_lno = ep->c_nlines = OOBLNO0; | |||
157 | ep->rcv_fd = ep->fcntl_fd = -1; | |||
158 | F_SET(ep, F_FIRSTMODIFY)(((ep)->flags) |= ((0x002))); | |||
159 | ||||
160 | /* | |||
161 | * Scan the user's path to find the file that we're going to | |||
162 | * try and open. | |||
163 | */ | |||
164 | if (file_spath(sp, frp, &sb, &exists)) { | |||
165 | free(ep); | |||
166 | return (1); | |||
167 | } | |||
168 | ||||
169 | /* | |||
170 | * If no name or backing file, for whatever reason, create a backing | |||
171 | * temporary file, saving the temp file name so we can later unlink | |||
172 | * it. If the user never named this file, copy the temporary file name | |||
173 | * to the real name (we display that until the user renames it). | |||
174 | */ | |||
175 | oname = frp->name; | |||
176 | ||||
177 | /* | |||
178 | * User is editing a named file that doesn't exist yet other than as a | |||
179 | * temporary file. | |||
180 | */ | |||
181 | if (!exists && oname != NULL((void *)0) && frp->tname != NULL((void *)0)) { | |||
182 | free(ep); | |||
183 | return (1); | |||
184 | } | |||
185 | ||||
186 | if (LF_ISSET(FS_OPENERR)((flags) & ((0x008))) || oname == NULL((void *)0) || !exists) { | |||
187 | /* | |||
188 | * Don't try to create a temporary support file twice. | |||
189 | */ | |||
190 | if (frp->tname != NULL((void *)0)) | |||
191 | goto err; | |||
192 | fd = mkstemp(tname); | |||
193 | if (fd == -1 || fstat(fd, &sb) == -1 || | |||
194 | fchmod(fd, S_IRUSR0000400 | S_IWUSR0000200) == -1) { | |||
195 | msgq(sp, M_SYSERR, | |||
196 | "Unable to create temporary file"); | |||
197 | if (fd != -1) { | |||
198 | close(fd); | |||
199 | (void)unlink(tname); | |||
200 | } | |||
201 | goto err; | |||
202 | } | |||
203 | (void)close(fd); | |||
204 | ||||
205 | if (frp->name == NULL((void *)0)) | |||
206 | F_SET(frp, FR_TMPFILE)(((frp)->flags) |= ((0x0080))); | |||
207 | if ((frp->tname = strdup(tname)) == NULL((void *)0) || | |||
208 | (frp->name == NULL((void *)0) && (frp->name = strdup(tname)) == NULL((void *)0))) { | |||
209 | free(frp->tname); | |||
210 | msgq(sp, M_SYSERR, NULL((void *)0)); | |||
211 | (void)unlink(tname); | |||
212 | goto err; | |||
213 | } | |||
214 | oname = frp->tname; | |||
215 | psize = 1024; | |||
216 | if (!LF_ISSET(FS_OPENERR)((flags) & ((0x008)))) | |||
217 | F_SET(frp, FR_NEWFILE)(((frp)->flags) |= ((0x0010))); | |||
218 | } else { | |||
219 | /* | |||
220 | * XXX | |||
221 | * A seat of the pants calculation: try to keep the file in | |||
222 | * 15 pages or less. Don't use a page size larger than 10K | |||
223 | * (vi should have good locality) or smaller than 1K. | |||
224 | */ | |||
225 | psize = ((sb.st_size / 15) + 1023) / 1024; | |||
226 | if (psize > 10) | |||
227 | psize = 10; | |||
228 | if (psize == 0) | |||
229 | psize = 1; | |||
230 | psize *= 1024; | |||
231 | ||||
232 | if (!S_ISREG(sb.st_mode)((sb.st_mode & 0170000) == 0100000)) | |||
233 | msgq_str(sp, M_ERR, oname, | |||
234 | "Warning: %s is not a regular file"); | |||
235 | } | |||
236 | ||||
237 | /* Save device, inode and modification time. */ | |||
238 | F_SET(ep, F_DEVSET)(((ep)->flags) |= ((0x001))); | |||
239 | ep->mdev = sb.st_dev; | |||
240 | ep->minode = sb.st_ino; | |||
241 | ||||
242 | ep->mtim = sb.st_mtim; | |||
243 | ||||
244 | /* Set up recovery. */ | |||
245 | memset(&oinfo, 0, sizeof(RECNOINFO)); | |||
246 | oinfo.bval = '\n'; /* Always set. */ | |||
247 | oinfo.psize = psize; | |||
248 | oinfo.flags = F_ISSET(sp->gp, G_SNAPSHOT)(((sp->gp)->flags) & ((0x0040))) ? R_SNAPSHOT0x04 : 0; | |||
249 | if (rcv_name == NULL((void *)0)) { | |||
250 | if (!rcv_tmp(sp, ep, frp->name)) | |||
251 | oinfo.bfname = ep->rcv_path; | |||
252 | } else { | |||
253 | if ((ep->rcv_path = strdup(rcv_name)) == NULL((void *)0)) { | |||
254 | msgq(sp, M_SYSERR, NULL((void *)0)); | |||
255 | goto err; | |||
256 | } | |||
257 | oinfo.bfname = ep->rcv_path; | |||
258 | F_SET(ep, F_MODIFIED)(((ep)->flags) |= ((0x004))); | |||
259 | } | |||
260 | ||||
261 | /* Open a db structure. */ | |||
262 | if ((ep->db = dbopen(rcv_name == NULL((void *)0) ? oname : NULL((void *)0), | |||
263 | O_NONBLOCK0x0004 | O_RDONLY0x0000, | |||
264 | S_IRUSR0000400 | S_IWUSR0000200 | S_IRGRP0000040 | S_IWGRP0000020 | S_IROTH0000004 | S_IWOTH0000002, | |||
265 | DB_RECNO, &oinfo)) == NULL((void *)0)) { | |||
266 | msgq_str(sp, | |||
267 | M_SYSERR, rcv_name == NULL((void *)0) ? oname : rcv_name, "%s"); | |||
268 | /* | |||
269 | * !!! | |||
270 | * Historically, vi permitted users to edit files that couldn't | |||
271 | * be read. This isn't useful for single files from a command | |||
272 | * line, but it's quite useful for "vi *.c", since you can skip | |||
273 | * past files that you can't read. | |||
274 | */ | |||
275 | open_err = 1; | |||
276 | goto oerr; | |||
277 | } | |||
278 | ||||
279 | /* | |||
280 | * Do the remaining things that can cause failure of the new file, | |||
281 | * mark and logging initialization. | |||
282 | */ | |||
283 | if (mark_init(sp, ep) || log_init(sp, ep)) | |||
284 | goto err; | |||
285 | ||||
286 | /* | |||
287 | * Set the alternate file name to be the file we're discarding. | |||
288 | * | |||
289 | * !!! | |||
290 | * Temporary files can't become alternate files, so there's no file | |||
291 | * name. This matches historical practice, although it could only | |||
292 | * happen in historical vi as the result of the initial command, i.e. | |||
293 | * if vi was executed without a file name. | |||
294 | */ | |||
295 | if (LF_ISSET(FS_SETALT)((flags) & ((0x020)))) | |||
296 | set_alt_name(sp, sp->frp == NULL((void *)0) || | |||
297 | F_ISSET(sp->frp, FR_TMPFILE)(((sp->frp)->flags) & ((0x0080))) ? NULL((void *)0) : sp->frp->name); | |||
298 | ||||
299 | /* | |||
300 | * Close the previous file; if that fails, close the new one and run | |||
301 | * for the border. | |||
302 | * | |||
303 | * !!! | |||
304 | * There's a nasty special case. If the user edits a temporary file, | |||
305 | * and then does an ":e! %", we need to re-initialize the backing | |||
306 | * file, but we can't change the name. (It's worse -- we're dealing | |||
307 | * with *names* here, we can't even detect that it happened.) Set a | |||
308 | * flag so that the file_end routine ignores the backing information | |||
309 | * of the old file if it happens to be the same as the new one. | |||
310 | * | |||
311 | * !!! | |||
312 | * Side-effect: after the call to file_end(), sp->frp may be NULL. | |||
313 | */ | |||
314 | if (sp->ep != NULL((void *)0)) { | |||
315 | F_SET(frp, FR_DONTDELETE)(((frp)->flags) |= ((0x0002))); | |||
316 | if (file_end(sp, NULL((void *)0), LF_ISSET(FS_FORCE)((flags) & ((0x004))))) { | |||
317 | (void)file_end(sp, ep, 1); | |||
318 | goto err; | |||
319 | } | |||
320 | F_CLR(frp, FR_DONTDELETE)(((frp)->flags) &= ~((0x0002))); | |||
321 | } | |||
322 | ||||
323 | /* | |||
324 | * Lock the file; if it's a recovery file, it should already be | |||
325 | * locked. Note, we acquire the lock after the previous file | |||
326 | * has been ended, so that we don't get an "already locked" error | |||
327 | * for ":edit!". | |||
328 | * | |||
329 | * XXX | |||
330 | * While the user can't interrupt us between the open and here, | |||
331 | * there's a race between the dbopen() and the lock. Not much | |||
332 | * we can do about it. | |||
333 | * | |||
334 | * XXX | |||
335 | * We don't make a big deal of not being able to lock the file. As | |||
336 | * locking rarely works over NFS, and often fails if the file was | |||
337 | * mmap(2)'d, it's far too common to do anything like print an error | |||
338 | * message, let alone make the file readonly. At some future time, | |||
339 | * when locking is a little more reliable, this should change to be | |||
340 | * an error. | |||
341 | */ | |||
342 | if (rcv_name == NULL((void *)0) && !O_ISSET(sp, O_READONLY)((((&(((sp)))->opts[(((O_READONLY)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_READONLY )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_READONLY)) )].o_cur.val)) | |||
343 | switch (file_lock(sp, oname, | |||
344 | &ep->fcntl_fd, ep->db->fd(ep->db), 0)) { | |||
345 | case LOCK_FAILED: | |||
346 | F_SET(frp, FR_UNLOCKED)(((frp)->flags) |= ((0x0100))); | |||
347 | break; | |||
348 | case LOCK_UNAVAIL: | |||
349 | readonly = 1; | |||
350 | msgq_str(sp, M_INFO, oname, | |||
351 | "%s already locked, session is read-only"); | |||
352 | break; | |||
353 | case LOCK_SUCCESS: | |||
354 | break; | |||
355 | } | |||
356 | ||||
357 | /* | |||
358 | * Historically, the readonly edit option was set per edit buffer in | |||
359 | * vi, unless the -R command-line option was specified or the program | |||
360 | * was executed as "view". (Well, to be truthful, if the letter 'w' | |||
361 | * occurred anywhere in the program name, but let's not get into that.) | |||
362 | * So, the persistent readonly state has to be stored in the screen | |||
363 | * structure, and the edit option value toggles with the contents of | |||
364 | * the edit buffer. If the persistent readonly flag is set, set the | |||
365 | * readonly edit option. | |||
366 | * | |||
367 | * Otherwise, try and figure out if a file is readonly. This is a | |||
368 | * dangerous thing to do. The kernel is the only arbiter of whether | |||
369 | * or not a file is writeable, and the best that a user program can | |||
370 | * do is guess. Obvious loopholes are files that are on a file system | |||
371 | * mounted readonly (access catches this one on a few systems), or | |||
372 | * alternate protection mechanisms, ACL's for example, that we can't | |||
373 | * portably check. Lots of fun, and only here because users whined. | |||
374 | * | |||
375 | * !!! | |||
376 | * Historic vi displayed the readonly message if none of the file | |||
377 | * write bits were set, or if an an access(2) call on the path | |||
378 | * failed. This seems reasonable. If the file is mode 444, root | |||
379 | * users may want to know that the owner of the file did not expect | |||
380 | * it to be written. | |||
381 | * | |||
382 | * Historic vi set the readonly bit if no write bits were set for | |||
383 | * a file, even if the access call would have succeeded. This makes | |||
384 | * the superuser force the write even when vi expects that it will | |||
385 | * succeed. I'm less supportive of this semantic, but it's historic | |||
386 | * practice and the conservative approach to vi'ing files as root. | |||
387 | * | |||
388 | * It would be nice if there was some way to update this when the user | |||
389 | * does a "^Z; chmod ...". The problem is that we'd first have to | |||
390 | * distinguish between readonly bits set because of file permissions | |||
391 | * and those set for other reasons. That's not too hard, but deciding | |||
392 | * when to reevaluate the permissions is trickier. An alternative | |||
393 | * might be to turn off the readonly bit if the user forces a write | |||
394 | * and it succeeds. | |||
395 | * | |||
396 | * XXX | |||
397 | * Access(2) doesn't consider the effective uid/gid values. This | |||
398 | * probably isn't a problem for vi when it's running standalone. | |||
399 | */ | |||
400 | if (readonly || F_ISSET(sp, SC_READONLY)(((sp)->flags) & ((0x00200000))) || | |||
401 | (!F_ISSET(frp, FR_NEWFILE)(((frp)->flags) & ((0x0010))) && | |||
402 | (!(sb.st_mode & (S_IWUSR0000200 | S_IWGRP0000020 | S_IWOTH0000002)) || | |||
403 | access(frp->name, W_OK0x02)))) | |||
404 | O_SET(sp, O_READONLY)o_set((sp), (O_READONLY), 0, ((void *)0), 1); | |||
405 | else | |||
406 | O_CLR(sp, O_READONLY)o_set((sp), (O_READONLY), 0, ((void *)0), 0); | |||
407 | ||||
408 | /* Switch... */ | |||
409 | ++ep->refcnt; | |||
410 | sp->ep = ep; | |||
411 | sp->frp = frp; | |||
412 | ||||
413 | /* Set the initial cursor position, queue initial command. */ | |||
414 | file_cinit(sp); | |||
415 | ||||
416 | /* Redraw the screen from scratch, schedule a welcome message. */ | |||
417 | F_SET(sp, SC_SCR_REFORMAT | SC_STATUS)(((sp)->flags) |= ((0x00000020 | 0x02000000))); | |||
418 | ||||
419 | return (0); | |||
420 | ||||
421 | err: | |||
422 | free(frp->name); | |||
423 | frp->name = NULL((void *)0); | |||
424 | if (frp->tname != NULL((void *)0)) { | |||
425 | (void)unlink(frp->tname); | |||
426 | free(frp->tname); | |||
427 | frp->tname = NULL((void *)0); | |||
428 | } | |||
429 | ||||
430 | oerr: if (F_ISSET(ep, F_RCV_ON)(((ep)->flags) & ((0x040)))) | |||
431 | (void)unlink(ep->rcv_path); | |||
432 | free(ep->rcv_path); | |||
433 | ep->rcv_path = NULL((void *)0); | |||
434 | if (ep->db != NULL((void *)0)) | |||
435 | (void)ep->db->close(ep->db); | |||
436 | free(ep); | |||
437 | ||||
438 | return (open_err ? | |||
439 | file_init(sp, frp, rcv_name, flags | FS_OPENERR0x008) : 1); | |||
440 | } | |||
441 | ||||
442 | /* | |||
443 | * file_spath -- | |||
444 | * Scan the user's path to find the file that we're going to | |||
445 | * try and open. | |||
446 | */ | |||
447 | static int | |||
448 | file_spath(SCR *sp, FREF *frp, struct stat *sbp, int *existsp) | |||
449 | { | |||
450 | CHAR_T savech; | |||
451 | size_t len; | |||
452 | int found; | |||
453 | char *name, *p, *t, path[PATH_MAX1024]; | |||
454 | ||||
455 | /* | |||
456 | * If the name is NULL or an explicit reference (i.e., the first | |||
457 | * component is . or ..) ignore the O_PATH option. | |||
458 | */ | |||
459 | name = frp->name; | |||
460 | if (name == NULL((void *)0)) { | |||
461 | *existsp = 0; | |||
462 | return (0); | |||
463 | } | |||
464 | if (name[0] == '/' || (name[0] == '.' && | |||
465 | (name[1] == '/' || (name[1] == '.' && name[2] == '/')))) { | |||
466 | *existsp = !stat(name, sbp); | |||
467 | return (0); | |||
468 | } | |||
469 | ||||
470 | /* Try . */ | |||
471 | if (!stat(name, sbp)) { | |||
472 | *existsp = 1; | |||
473 | return (0); | |||
474 | } | |||
475 | ||||
476 | /* Try the O_PATH option values. */ | |||
477 | for (found = 0, p = t = O_STR(sp, O_PATH)((((&((sp))->opts[((O_PATH))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_PATH))].o_cur .val].o_cur.str : ((sp))->opts[((O_PATH))].o_cur.str);; ++p) | |||
478 | if (*p == ':' || *p == '\0') { | |||
479 | if (t < p - 1) { | |||
480 | savech = *p; | |||
481 | *p = '\0'; | |||
482 | len = snprintf(path, | |||
483 | sizeof(path), "%s/%s", t, name); | |||
484 | if (len >= sizeof(path)) | |||
485 | len = sizeof(path) - 1; | |||
486 | *p = savech; | |||
487 | if (!stat(path, sbp)) { | |||
488 | found = 1; | |||
489 | break; | |||
490 | } | |||
491 | } | |||
492 | t = p + 1; | |||
493 | if (*p == '\0') | |||
494 | break; | |||
495 | } | |||
496 | ||||
497 | /* If we found it, build a new pathname and discard the old one. */ | |||
498 | if (found) { | |||
499 | MALLOC_RET(sp, p, len + 1){ if (((p) = malloc(len + 1)) == ((void *)0)) { msgq((sp), M_SYSERR , ((void *)0)); return (1); } }; | |||
500 | memcpy(p, path, len + 1); | |||
501 | free(frp->name); | |||
502 | frp->name = p; | |||
503 | } | |||
504 | *existsp = found; | |||
505 | return (0); | |||
506 | } | |||
507 | ||||
508 | /* | |||
509 | * file_cinit -- | |||
510 | * Set up the initial cursor position. | |||
511 | */ | |||
512 | static void | |||
513 | file_cinit(SCR *sp) | |||
514 | { | |||
515 | GS *gp; | |||
516 | MARK m; | |||
517 | size_t len; | |||
518 | int nb; | |||
519 | ||||
520 | /* Set some basic defaults. */ | |||
521 | sp->lno = 1; | |||
522 | sp->cno = 0; | |||
523 | ||||
524 | /* | |||
525 | * Historically, initial commands (the -c option) weren't executed | |||
526 | * until a file was loaded, e.g. "vi +10 nofile", followed by an | |||
527 | * :edit or :tag command, would execute the +10 on the file loaded | |||
528 | * by the subsequent command, (assuming that it existed). This | |||
529 | * applied as well to files loaded using the tag commands, and we | |||
530 | * follow that historic practice. Also, all initial commands were | |||
531 | * ex commands and were always executed on the last line of the file. | |||
532 | * | |||
533 | * Otherwise, if no initial command for this file: | |||
534 | * If in ex mode, move to the last line, first nonblank character. | |||
535 | * If the file has previously been edited, move to the last known | |||
536 | * position, and check it for validity. | |||
537 | * Otherwise, move to the first line, first nonblank. | |||
538 | * | |||
539 | * This gets called by the file init code, because we may be in a | |||
540 | * file of ex commands and we want to execute them from the right | |||
541 | * location in the file. | |||
542 | */ | |||
543 | nb = 0; | |||
544 | gp = sp->gp; | |||
545 | if (gp->c_option != NULL((void *)0) && !F_ISSET(sp->frp, FR_NEWFILE)(((sp->frp)->flags) & ((0x0010)))) { | |||
546 | if (db_last(sp, &sp->lno)) | |||
547 | return; | |||
548 | if (sp->lno == 0) { | |||
549 | sp->lno = 1; | |||
550 | sp->cno = 0; | |||
551 | } | |||
552 | if (ex_run_str(sp, | |||
553 | "-c option", gp->c_option, strlen(gp->c_option), 1, 1)) | |||
554 | return; | |||
555 | gp->c_option = NULL((void *)0); | |||
556 | } else if (F_ISSET(sp, SC_EX)(((sp)->flags) & ((0x00000001)))) { | |||
557 | if (db_last(sp, &sp->lno)) | |||
558 | return; | |||
559 | if (sp->lno == 0) { | |||
560 | sp->lno = 1; | |||
561 | sp->cno = 0; | |||
562 | return; | |||
563 | } | |||
564 | nb = 1; | |||
565 | } else { | |||
566 | if (F_ISSET(sp->frp, FR_CURSORSET)(((sp->frp)->flags) & ((0x0001)))) { | |||
567 | sp->lno = sp->frp->lno; | |||
568 | sp->cno = sp->frp->cno; | |||
569 | ||||
570 | /* If returning to a file in vi, center the line. */ | |||
571 | F_SET(sp, SC_SCR_CENTER)(((sp)->flags) |= ((0x00000080))); | |||
572 | } else { | |||
573 | if (O_ISSET(sp, O_COMMENT)((((&(((sp)))->opts[(((O_COMMENT)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_COMMENT )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_COMMENT))) ].o_cur.val)) | |||
574 | file_comment(sp); | |||
575 | else | |||
576 | sp->lno = 1; | |||
577 | nb = 1; | |||
578 | } | |||
579 | if (db_get(sp, sp->lno, 0, NULL((void *)0), &len)) { | |||
580 | sp->lno = 1; | |||
581 | sp->cno = 0; | |||
582 | return; | |||
583 | } | |||
584 | if (!nb && sp->cno > len) | |||
585 | nb = 1; | |||
586 | } | |||
587 | if (nb) { | |||
588 | sp->cno = 0; | |||
589 | (void)nonblank(sp, sp->lno, &sp->cno); | |||
590 | } | |||
591 | ||||
592 | /* | |||
593 | * !!! | |||
594 | * The initial column is also the most attractive column. | |||
595 | */ | |||
596 | sp->rcm = sp->cno; | |||
597 | ||||
598 | /* | |||
599 | * !!! | |||
600 | * Historically, vi initialized the absolute mark, but ex did not. | |||
601 | * Which meant, that if the first command in ex mode was "visual", | |||
602 | * or if an ex command was executed first (e.g. vi +10 file) vi was | |||
603 | * entered without the mark being initialized. For consistency, if | |||
604 | * the file isn't empty, we initialize it for everyone, believing | |||
605 | * that it can't hurt, and is generally useful. Not initializing it | |||
606 | * if the file is empty is historic practice, although it has always | |||
607 | * been possible to set (and use) marks in empty vi files. | |||
608 | */ | |||
609 | m.lno = sp->lno; | |||
610 | m.cno = sp->cno; | |||
611 | (void)mark_set(sp, ABSMARK1'\'', &m, 0); | |||
612 | } | |||
613 | ||||
614 | /* | |||
615 | * file_end -- | |||
616 | * Stop editing a file. | |||
617 | * | |||
618 | * PUBLIC: int file_end(SCR *, EXF *, int); | |||
619 | */ | |||
620 | int | |||
621 | file_end(SCR *sp, EXF *ep, int force) | |||
622 | { | |||
623 | FREF *frp; | |||
624 | ||||
625 | /* | |||
626 | * !!! | |||
627 | * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER. | |||
628 | * (If argument ep is NULL, use sp->ep.) | |||
629 | * | |||
630 | * If multiply referenced, just decrement the count and return. | |||
631 | */ | |||
632 | if (ep == NULL((void *)0)) | |||
633 | ep = sp->ep; | |||
634 | if (--ep->refcnt != 0) | |||
635 | return (0); | |||
636 | ||||
637 | /* | |||
638 | * | |||
639 | * Clean up the FREF structure. | |||
640 | * | |||
641 | * Save the cursor location. | |||
642 | * | |||
643 | * XXX | |||
644 | * It would be cleaner to do this somewhere else, but by the time | |||
645 | * ex or vi knows that we're changing files it's already happened. | |||
646 | */ | |||
647 | frp = sp->frp; | |||
648 | frp->lno = sp->lno; | |||
649 | frp->cno = sp->cno; | |||
650 | F_SET(frp, FR_CURSORSET)(((frp)->flags) |= ((0x0001))); | |||
651 | ||||
652 | /* | |||
653 | * We may no longer need the temporary backing file, so clean it | |||
654 | * up. We don't need the FREF structure either, if the file was | |||
655 | * never named, so lose it. | |||
656 | * | |||
657 | * !!! | |||
658 | * Re: FR_DONTDELETE, see the comment above in file_init(). | |||
659 | */ | |||
660 | if (!F_ISSET(frp, FR_DONTDELETE)(((frp)->flags) & ((0x0002))) && frp->tname != NULL((void *)0)) { | |||
661 | if (unlink(frp->tname)) | |||
662 | msgq_str(sp, M_SYSERR, frp->tname, "%s: remove"); | |||
663 | free(frp->tname); | |||
664 | frp->tname = NULL((void *)0); | |||
665 | if (F_ISSET(frp, FR_TMPFILE)(((frp)->flags) & ((0x0080)))) { | |||
666 | TAILQ_REMOVE(&sp->gp->frefq, frp, q)do { if (((frp)->q.tqe_next) != ((void *)0)) (frp)->q.tqe_next ->q.tqe_prev = (frp)->q.tqe_prev; else (&sp->gp-> frefq)->tqh_last = (frp)->q.tqe_prev; *(frp)->q.tqe_prev = (frp)->q.tqe_next; ; ; } while (0); | |||
667 | free(frp->name); | |||
668 | free(frp); | |||
669 | } | |||
670 | sp->frp = NULL((void *)0); | |||
671 | } | |||
672 | ||||
673 | /* | |||
674 | * Clean up the EXF structure. | |||
675 | * | |||
676 | * Close the db structure. | |||
677 | */ | |||
678 | if (ep->db->close != NULL((void *)0) && ep->db->close(ep->db) && !force) { | |||
679 | msgq_str(sp, M_SYSERR, frp->name, "%s: close"); | |||
680 | ++ep->refcnt; | |||
681 | return (1); | |||
682 | } | |||
683 | ||||
684 | /* COMMITTED TO THE CLOSE. THERE'S NO GOING BACK... */ | |||
685 | ||||
686 | /* Stop logging. */ | |||
687 | (void)log_end(sp, ep); | |||
688 | ||||
689 | /* Free up any marks. */ | |||
690 | (void)mark_end(sp, ep); | |||
691 | ||||
692 | /* | |||
693 | * Delete recovery files, close the open descriptor, free recovery | |||
694 | * memory. See recover.c for a description of the protocol. | |||
695 | * | |||
696 | * XXX | |||
697 | * Unlink backup file first, we can detect that the recovery file | |||
698 | * doesn't reference anything when the user tries to recover it. | |||
699 | * There's a race, here, obviously, but it's fairly small. | |||
700 | */ | |||
701 | if (!F_ISSET(ep, F_RCV_NORM)(((ep)->flags) & ((0x020)))) { | |||
702 | if (ep->rcv_path != NULL((void *)0) && unlink(ep->rcv_path)) | |||
703 | msgq_str(sp, M_SYSERR, ep->rcv_path, "%s: remove"); | |||
704 | if (ep->rcv_mpath != NULL((void *)0) && unlink(ep->rcv_mpath)) | |||
705 | msgq_str(sp, M_SYSERR, ep->rcv_mpath, "%s: remove"); | |||
706 | } | |||
707 | if (ep->fcntl_fd != -1) | |||
708 | (void)close(ep->fcntl_fd); | |||
709 | if (ep->rcv_fd != -1) | |||
710 | (void)close(ep->rcv_fd); | |||
711 | free(ep->rcv_path); | |||
712 | free(ep->rcv_mpath); | |||
713 | free(ep); | |||
714 | return (0); | |||
715 | } | |||
716 | ||||
717 | /* | |||
718 | * file_write -- | |||
719 | * Write the file to disk. Historic vi had fairly convoluted | |||
720 | * semantics for whether or not writes would happen. That's | |||
721 | * why all the flags. | |||
722 | * | |||
723 | * PUBLIC: int file_write(SCR *, MARK *, MARK *, char *, int); | |||
724 | */ | |||
725 | int | |||
726 | file_write(SCR *sp, MARK *fm, MARK *tm, char *name, int flags) | |||
727 | { | |||
728 | enum { NEWFILE, OLDFILE } mtype; | |||
729 | struct stat sb; | |||
730 | EXF *ep; | |||
731 | FILE *fp; | |||
732 | FREF *frp; | |||
733 | MARK from, to; | |||
734 | size_t len; | |||
735 | u_long nlno, nch; | |||
736 | int fd, nf, noname, oflags, rval; | |||
737 | char *p, *s, *t, buf[PATH_MAX1024 + 64]; | |||
738 | const char *msgstr; | |||
739 | ||||
740 | ep = sp->ep; | |||
741 | frp = sp->frp; | |||
742 | ||||
743 | /* | |||
744 | * Writing '%', or naming the current file explicitly, has the | |||
745 | * same semantics as writing without a name. | |||
746 | */ | |||
747 | if (name == NULL((void *)0) || !strcmp(name, frp->name)) { | |||
748 | noname = 1; | |||
749 | name = frp->name; | |||
750 | } else | |||
751 | noname = 0; | |||
752 | ||||
753 | /* Can't write files marked read-only, unless forced. */ | |||
754 | if (!LF_ISSET(FS_FORCE)((flags) & ((0x004))) && noname && O_ISSET(sp, O_READONLY)((((&(((sp)))->opts[(((O_READONLY)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_READONLY )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_READONLY)) )].o_cur.val)) { | |||
755 | msgq(sp, M_ERR, LF_ISSET(FS_POSSIBLE)((flags) & ((0x010))) ? | |||
756 | "Read-only file, not written; use ! to override" : | |||
757 | "Read-only file, not written"); | |||
758 | return (1); | |||
759 | } | |||
760 | ||||
761 | /* If not forced, not appending, and "writeany" not set ... */ | |||
762 | if (!LF_ISSET(FS_FORCE | FS_APPEND)((flags) & ((0x004 | 0x002))) && !O_ISSET(sp, O_WRITEANY)((((&(((sp)))->opts[(((O_WRITEANY)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_WRITEANY )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_WRITEANY)) )].o_cur.val)) { | |||
763 | /* Don't overwrite anything but the original file. */ | |||
764 | if ((!noname || F_ISSET(frp, FR_NAMECHANGE)(((frp)->flags) & ((0x0008)))) && | |||
765 | !stat(name, &sb)) { | |||
766 | msgq_str(sp, M_ERR, name, | |||
767 | LF_ISSET(FS_POSSIBLE)((flags) & ((0x010))) ? | |||
768 | "%s exists, not written; use ! to override" : | |||
769 | "%s exists, not written"); | |||
770 | return (1); | |||
771 | } | |||
772 | ||||
773 | /* | |||
774 | * Don't write part of any existing file. Only test for the | |||
775 | * original file, the previous test catches anything else. | |||
776 | */ | |||
777 | if (!LF_ISSET(FS_ALL)((flags) & ((0x001))) && noname && !stat(name, &sb)) { | |||
778 | msgq(sp, M_ERR, LF_ISSET(FS_POSSIBLE)((flags) & ((0x010))) ? | |||
779 | "Partial file, not written; use ! to override" : | |||
780 | "Partial file, not written"); | |||
781 | return (1); | |||
782 | } | |||
783 | } | |||
784 | ||||
785 | /* | |||
786 | * Figure out if the file already exists -- if it doesn't, we display | |||
787 | * the "new file" message. The stat might not be necessary, but we | |||
788 | * just repeat it because it's easier than hacking the previous tests. | |||
789 | * The information is only used for the user message and modification | |||
790 | * time test, so we can ignore the obvious race condition. | |||
791 | * | |||
792 | * One final test. If we're not forcing or appending the current file, | |||
793 | * and we have a saved modification time, object if the file changed | |||
794 | * since we last edited or wrote it, and make them force it. | |||
795 | */ | |||
796 | if (stat(name, &sb)) | |||
797 | mtype = NEWFILE; | |||
798 | else { | |||
799 | if (noname && !LF_ISSET(FS_FORCE | FS_APPEND)((flags) & ((0x004 | 0x002))) && | |||
800 | ((F_ISSET(ep, F_DEVSET)(((ep)->flags) & ((0x001))) && | |||
801 | (sb.st_dev != ep->mdev || sb.st_ino != ep->minode)) || | |||
802 | timespeccmp(&sb.st_mtim, &ep->mtim, !=)(((&sb.st_mtim)->tv_sec == (&ep->mtim)->tv_sec ) ? ((&sb.st_mtim)->tv_nsec != (&ep->mtim)-> tv_nsec) : ((&sb.st_mtim)->tv_sec != (&ep->mtim )->tv_sec)))) { | |||
803 | msgq_str(sp, M_ERR, name, LF_ISSET(FS_POSSIBLE)((flags) & ((0x010))) ? | |||
804 | "%s: file modified more recently than this copy; use ! to override" : | |||
805 | "%s: file modified more recently than this copy"); | |||
806 | return (1); | |||
807 | } | |||
808 | ||||
809 | mtype = OLDFILE; | |||
810 | } | |||
811 | ||||
812 | /* Set flags to create, write, and either append or truncate. */ | |||
813 | oflags = O_CREAT0x0200 | O_WRONLY0x0001 | | |||
814 | (LF_ISSET(FS_APPEND)((flags) & ((0x002))) ? O_APPEND0x0008 : O_TRUNC0x0400); | |||
815 | ||||
816 | /* Backup the file if requested. */ | |||
817 | if (!opts_empty(sp, O_BACKUP, 1) && | |||
818 | file_backup(sp, name, O_STR(sp, O_BACKUP)((((&((sp))->opts[((O_BACKUP))])->flags) & ((0x01 ))) ? ((sp))->gp->opts[((sp))->opts[((O_BACKUP))].o_cur .val].o_cur.str : ((sp))->opts[((O_BACKUP))].o_cur.str)) && !LF_ISSET(FS_FORCE)((flags) & ((0x004)))) | |||
819 | return (1); | |||
820 | ||||
821 | /* Open the file. */ | |||
822 | if ((fd = open(name, oflags, | |||
823 | S_IRUSR0000400 | S_IWUSR0000200 | S_IRGRP0000040 | S_IWGRP0000020 | S_IROTH0000004 | S_IWOTH0000002)) < 0) { | |||
824 | msgq_str(sp, M_SYSERR, name, "%s"); | |||
825 | return (1); | |||
826 | } | |||
827 | ||||
828 | /* Try and get a lock. */ | |||
829 | if (!noname && file_lock(sp, NULL((void *)0), NULL((void *)0), fd, 0) == LOCK_UNAVAIL) | |||
830 | msgq_str(sp, M_ERR, name, | |||
831 | "%s: write lock was unavailable"); | |||
832 | ||||
833 | /* | |||
834 | * Use stdio for buffering. | |||
835 | * | |||
836 | * XXX | |||
837 | * SVR4.2 requires the fdopen mode exactly match the original open | |||
838 | * mode, i.e. you have to open with "a" if appending. | |||
839 | */ | |||
840 | if ((fp = fdopen(fd, LF_ISSET(FS_APPEND)((flags) & ((0x002))) ? "a" : "w")) == NULL((void *)0)) { | |||
841 | msgq_str(sp, M_SYSERR, name, "%s"); | |||
842 | (void)close(fd); | |||
843 | return (1); | |||
844 | } | |||
845 | ||||
846 | /* Build fake addresses, if necessary. */ | |||
847 | if (fm == NULL((void *)0)) { | |||
848 | from.lno = 1; | |||
849 | from.cno = 0; | |||
850 | fm = &from; | |||
851 | if (db_last(sp, &to.lno)) | |||
852 | return (1); | |||
853 | to.cno = 0; | |||
854 | tm = &to; | |||
855 | } | |||
856 | ||||
857 | rval = ex_writefp(sp, name, fp, fm, tm, &nlno, &nch, 0); | |||
858 | ||||
859 | /* | |||
860 | * Save the new last modification time -- even if the write fails | |||
861 | * we re-init the time. That way the user can clean up the disk | |||
862 | * and rewrite without having to force it. | |||
863 | */ | |||
864 | if (noname) { | |||
865 | if (stat(name, &sb)) | |||
866 | (void)clock_gettime(CLOCK_REALTIME0, &ep->mtim); | |||
867 | else { | |||
868 | F_SET(ep, F_DEVSET)(((ep)->flags) |= ((0x001))); | |||
869 | ep->mdev = sb.st_dev; | |||
870 | ep->minode = sb.st_ino; | |||
871 | ||||
872 | ep->mtim = sb.st_mtim; | |||
873 | } | |||
874 | } | |||
875 | ||||
876 | /* | |||
877 | * If the write failed, complain loudly. ex_writefp() has already | |||
878 | * complained about the actual error, reinforce it if data was lost. | |||
879 | */ | |||
880 | if (rval) { | |||
881 | if (!LF_ISSET(FS_APPEND)((flags) & ((0x002)))) | |||
882 | msgq_str(sp, M_ERR, name, | |||
883 | "%s: WARNING: FILE TRUNCATED"); | |||
884 | return (1); | |||
885 | } | |||
886 | ||||
887 | /* | |||
888 | * Once we've actually written the file, it doesn't matter that the | |||
889 | * file name was changed -- if it was, we've already whacked it. | |||
890 | */ | |||
891 | F_CLR(frp, FR_NAMECHANGE)(((frp)->flags) &= ~((0x0008))); | |||
892 | ||||
893 | /* | |||
894 | * If wrote the entire file, and it wasn't by appending it to a file, | |||
895 | * clear the modified bit. If the file was written to the original | |||
896 | * file name and the file is a temporary, set the "no exit" bit. This | |||
897 | * permits the user to write the file and use it in the context of the | |||
898 | * filesystem, but still keeps them from discarding their changes by | |||
899 | * exiting. | |||
900 | */ | |||
901 | if (LF_ISSET(FS_ALL)((flags) & ((0x001))) && !LF_ISSET(FS_APPEND)((flags) & ((0x002)))) { | |||
902 | F_CLR(ep, F_MODIFIED)(((ep)->flags) &= ~((0x004))); | |||
903 | if (F_ISSET(frp, FR_TMPFILE)(((frp)->flags) & ((0x0080)))) { | |||
904 | if (noname) | |||
905 | F_SET(frp, FR_TMPEXIT)(((frp)->flags) |= ((0x0040))); | |||
906 | else | |||
907 | F_CLR(frp, FR_TMPEXIT)(((frp)->flags) &= ~((0x0040))); | |||
908 | } | |||
909 | } | |||
910 | ||||
911 | p = msg_print(sp, name, &nf); | |||
912 | switch (mtype) { | |||
913 | case NEWFILE: | |||
914 | len = snprintf(buf, sizeof(buf), | |||
915 | "%s: new file: %lu lines, %lu characters", p, nlno, nch); | |||
916 | if (len >= sizeof(buf)) | |||
917 | len = sizeof(buf) - 1; | |||
918 | break; | |||
919 | case OLDFILE: | |||
920 | msgstr = LF_ISSET(FS_APPEND)((flags) & ((0x002))) ? | |||
921 | "%s: appended: %lu lines, %lu characters" : | |||
922 | "%s: %lu lines, %lu characters"; | |||
923 | len = snprintf(buf, sizeof(buf), msgstr, p, nlno, nch); | |||
924 | if (len >= sizeof(buf)) | |||
925 | len = sizeof(buf) - 1; | |||
926 | break; | |||
927 | default: | |||
928 | abort(); | |||
929 | } | |||
930 | ||||
931 | /* | |||
932 | * There's a nasty problem with long path names. Tags files | |||
933 | * can result in long paths and vi will request a continuation key from | |||
934 | * the user. Unfortunately, the user has typed ahead, and chaos will | |||
935 | * result. If we assume that the characters in the filenames only take | |||
936 | * a single screen column each, we can trim the filename. | |||
937 | */ | |||
938 | s = buf; | |||
939 | if (len >= sp->cols) { | |||
940 | for (s = buf, t = buf + strlen(p); s < t && | |||
941 | (*s != '/' || len >= sp->cols - 3); ++s, --len); | |||
942 | if (s == t) | |||
943 | s = buf; | |||
944 | else { | |||
945 | *--s = '.'; /* Leading ellipses. */ | |||
946 | *--s = '.'; | |||
947 | *--s = '.'; | |||
948 | } | |||
949 | } | |||
950 | msgq(sp, M_INFO, "%s", s); | |||
951 | if (nf) | |||
952 | FREE_SPACE(sp, p, 0){ GS *L__gp = (sp) == ((void *)0) ? ((void *)0) : (sp)->gp ; if (L__gp != ((void *)0) && (p) == L__gp->tmp_bp ) (((L__gp)->flags) &= ~((0x0100))); else free(p); }; | |||
953 | return (0); | |||
954 | } | |||
955 | ||||
956 | /* | |||
957 | * file_backup -- | |||
958 | * Backup the about-to-be-written file. | |||
959 | * | |||
960 | * XXX | |||
961 | * We do the backup by copying the entire file. It would be nice to do | |||
962 | * a rename instead, but: (1) both files may not fit and we want to fail | |||
963 | * before doing the rename; (2) the backup file may not be on the same | |||
964 | * disk partition as the file being written; (3) there may be optional | |||
965 | * file information (MACs, DACs, whatever) that we won't get right if we | |||
966 | * recreate the file. So, let's not risk it. | |||
967 | */ | |||
968 | static int | |||
969 | file_backup(SCR *sp, char *name, char *bname) | |||
970 | { | |||
971 | struct dirent *dp; | |||
972 | struct stat sb; | |||
973 | DIR *dirp; | |||
974 | EXCMD cmd; | |||
975 | off_t off; | |||
976 | size_t blen; | |||
977 | int flags, maxnum, nr, num, nw, rfd, wfd, version; | |||
978 | char *bp, *estr, *p, *pct, *slash, *t, *wfname, buf[8192]; | |||
979 | ||||
980 | rfd = wfd = -1; | |||
981 | bp = estr = wfname = NULL((void *)0); | |||
982 | ||||
983 | /* | |||
984 | * Open the current file for reading. Do this first, so that | |||
985 | * we don't exec a shell before the most likely failure point. | |||
986 | * If it doesn't exist, it's okay, there's just nothing to back | |||
987 | * up. | |||
988 | */ | |||
989 | errno(*__errno()) = 0; | |||
990 | if ((rfd = open(name, O_RDONLY0x0000)) < 0) { | |||
| ||||
991 | if (errno(*__errno()) == ENOENT2) | |||
992 | return (0); | |||
993 | estr = name; | |||
994 | goto err; | |||
995 | } | |||
996 | ||||
997 | /* | |||
998 | * If the name starts with an 'N' character, add a version number | |||
999 | * to the name. Strip the leading N from the string passed to the | |||
1000 | * expansion routines, for no particular reason. It would be nice | |||
1001 | * to permit users to put the version number anywhere in the backup | |||
1002 | * name, but there isn't a special character that we can use in the | |||
1003 | * name, and giving a new character a special meaning leads to ugly | |||
1004 | * hacks both here and in the supporting ex routines. | |||
1005 | * | |||
1006 | * Shell and file name expand the option's value. | |||
1007 | */ | |||
1008 | argv_init(sp, &cmd); | |||
1009 | ex_cinit(&cmd, 0, 0, 0, 0, 0, NULL((void *)0)); | |||
1010 | if (bname[0] == 'N') { | |||
1011 | version = 1; | |||
1012 | ++bname; | |||
1013 | } else | |||
1014 | version = 0; | |||
1015 | if (argv_exp2(sp, &cmd, bname, strlen(bname))) | |||
1016 | return (1); | |||
1017 | ||||
1018 | /* | |||
1019 | * 0 args: impossible. | |||
1020 | * 1 args: use it. | |||
1021 | * >1 args: object, too many args. | |||
1022 | */ | |||
1023 | if (cmd.argc != 1) { | |||
1024 | msgq_str(sp, M_ERR, bname, | |||
1025 | "%s expanded into too many file names"); | |||
1026 | (void)close(rfd); | |||
1027 | return (1); | |||
1028 | } | |||
1029 | ||||
1030 | /* | |||
1031 | * If appending a version number, read through the directory, looking | |||
1032 | * for file names that match the name followed by a number. Make all | |||
1033 | * of the other % characters in name literal, so the user doesn't get | |||
1034 | * surprised and sscanf doesn't drop core indirecting through pointers | |||
1035 | * that don't exist. If any such files are found, increment its number | |||
1036 | * by one. | |||
1037 | */ | |||
1038 | if (version
| |||
1039 | GET_SPACE_GOTO(sp, bp, blen, cmd.argv[0]->len * 2 + 50){ GS *L__gp = (sp) == ((void *)0) ? ((void *)0) : (sp)->gp ; if (L__gp == ((void *)0) || (((L__gp)->flags) & ((0x0100 )))) { (bp) = ((void *)0); (blen) = 0; { void *L__bincp; if ( ((cmd.argv[0]->len * 2 + 50)) > ((blen))) { if ((L__bincp = binc(((sp)), ((bp)), &((blen)), ((cmd.argv[0]->len * 2 + 50)))) == ((void *)0)) goto alloc_err; ((bp)) = L__bincp ; } }; } else { { void *L__bincp; if (((cmd.argv[0]->len * 2 + 50)) > (L__gp->tmp_blen)) { if ((L__bincp = binc(( (sp)), (L__gp->tmp_bp), &(L__gp->tmp_blen), ((cmd.argv [0]->len * 2 + 50)))) == ((void *)0)) goto alloc_err; (L__gp ->tmp_bp) = L__bincp; } }; (bp) = L__gp->tmp_bp; (blen) = L__gp->tmp_blen; (((L__gp)->flags) |= ((0x0100))); } }; | |||
1040 | for (t = bp, slash = NULL((void *)0), | |||
1041 | p = cmd.argv[0]->bp; p[0] != '\0'; *t++ = *p++) | |||
| ||||
1042 | if (p[0] == '%') { | |||
1043 | if (p[1] != '%') | |||
1044 | *t++ = '%'; | |||
1045 | } else if (p[0] == '/') | |||
1046 | slash = t; | |||
1047 | pct = t; | |||
1048 | *t++ = '%'; | |||
1049 | *t++ = 'd'; | |||
1050 | *t = '\0'; | |||
1051 | ||||
1052 | if (slash == NULL((void *)0)) { | |||
1053 | dirp = opendir("."); | |||
1054 | p = bp; | |||
1055 | } else { | |||
1056 | *slash = '\0'; | |||
1057 | dirp = opendir(bp); | |||
1058 | *slash = '/'; | |||
1059 | p = slash + 1; | |||
1060 | } | |||
1061 | if (dirp == NULL((void *)0)) { | |||
1062 | estr = cmd.argv[0]->bp; | |||
1063 | goto err; | |||
1064 | } | |||
1065 | ||||
1066 | for (maxnum = 0; (dp = readdir(dirp)) != NULL((void *)0);) | |||
1067 | if (sscanf(dp->d_name, p, &num) == 1 && num > maxnum) | |||
1068 | maxnum = num; | |||
1069 | (void)closedir(dirp); | |||
1070 | ||||
1071 | /* Format the backup file name. */ | |||
1072 | (void)snprintf(pct, blen - (pct - bp), "%d", maxnum + 1); | |||
1073 | wfname = bp; | |||
1074 | } else { | |||
1075 | bp = NULL((void *)0); | |||
1076 | wfname = cmd.argv[0]->bp; | |||
1077 | } | |||
1078 | ||||
1079 | /* Open the backup file, avoiding lurkers. */ | |||
1080 | if (stat(wfname, &sb) == 0) { | |||
1081 | if (!S_ISREG(sb.st_mode)((sb.st_mode & 0170000) == 0100000)) { | |||
1082 | msgq_str(sp, M_ERR, bname, | |||
1083 | "%s: not a regular file"); | |||
1084 | goto err; | |||
1085 | } | |||
1086 | if (sb.st_uid != getuid()) { | |||
1087 | msgq_str(sp, M_ERR, bname, "%s: not owned by you"); | |||
1088 | goto err; | |||
1089 | } | |||
1090 | if (sb.st_mode & (S_IRGRP0000040 | S_IWGRP0000020 | S_IROTH0000004 | S_IWOTH0000002)) { | |||
1091 | msgq_str(sp, M_ERR, bname, | |||
1092 | "%s: accessible by a user other than the owner"); | |||
1093 | goto err; | |||
1094 | } | |||
1095 | flags = O_TRUNC0x0400; | |||
1096 | } else | |||
1097 | flags = O_CREAT0x0200 | O_EXCL0x0800; | |||
1098 | if ((wfd = open(wfname, flags | O_WRONLY0x0001, S_IRUSR0000400 | S_IWUSR0000200)) < 0 || | |||
1099 | fchmod(wfd, S_IRUSR0000400 | S_IWUSR0000200) < 0) { | |||
1100 | if (wfd != -1) { | |||
1101 | close(wfd); | |||
1102 | (void)unlink(wfname); | |||
1103 | } | |||
1104 | estr = bname; | |||
1105 | goto err; | |||
1106 | } | |||
1107 | ||||
1108 | /* Copy the file's current contents to its backup value. */ | |||
1109 | while ((nr = read(rfd, buf, sizeof(buf))) > 0) | |||
1110 | for (off = 0; nr != 0; nr -= nw, off += nw) | |||
1111 | if ((nw = write(wfd, buf + off, nr)) < 0) { | |||
1112 | estr = wfname; | |||
1113 | goto err; | |||
1114 | } | |||
1115 | if (nr < 0) { | |||
1116 | estr = name; | |||
1117 | goto err; | |||
1118 | } | |||
1119 | ||||
1120 | if (close(rfd)) { | |||
1121 | estr = name; | |||
1122 | goto err; | |||
1123 | } | |||
1124 | if (close(wfd)) { | |||
1125 | estr = wfname; | |||
1126 | goto err; | |||
1127 | } | |||
1128 | if (bp != NULL((void *)0)) | |||
1129 | FREE_SPACE(sp, bp, blen){ GS *L__gp = (sp) == ((void *)0) ? ((void *)0) : (sp)->gp ; if (L__gp != ((void *)0) && (bp) == L__gp->tmp_bp ) (((L__gp)->flags) &= ~((0x0100))); else free(bp); }; | |||
1130 | return (0); | |||
1131 | ||||
1132 | alloc_err: | |||
1133 | err: if (rfd != -1) | |||
1134 | (void)close(rfd); | |||
1135 | if (wfd != -1) { | |||
1136 | (void)unlink(wfname); | |||
1137 | (void)close(wfd); | |||
1138 | } | |||
1139 | if (estr) | |||
1140 | msgq_str(sp, M_SYSERR, estr, "%s"); | |||
1141 | if (bp != NULL((void *)0)) | |||
1142 | FREE_SPACE(sp, bp, blen){ GS *L__gp = (sp) == ((void *)0) ? ((void *)0) : (sp)->gp ; if (L__gp != ((void *)0) && (bp) == L__gp->tmp_bp ) (((L__gp)->flags) &= ~((0x0100))); else free(bp); }; | |||
1143 | return (1); | |||
1144 | } | |||
1145 | ||||
1146 | /* | |||
1147 | * file_comment -- | |||
1148 | * Skip the first comment. | |||
1149 | */ | |||
1150 | static void | |||
1151 | file_comment(SCR *sp) | |||
1152 | { | |||
1153 | recno_t lno; | |||
1154 | size_t len; | |||
1155 | char *p; | |||
1156 | ||||
1157 | for (lno = 1; !db_get(sp, lno, 0, &p, &len) && len == 0; ++lno); | |||
1158 | if (p == NULL((void *)0)) | |||
1159 | return; | |||
1160 | if (p[0] == '#') { | |||
1161 | F_SET(sp, SC_SCR_TOP)(((sp)->flags) |= ((0x00000100))); | |||
1162 | while (!db_get(sp, ++lno, 0, &p, &len)) | |||
1163 | if (len < 1 || p[0] != '#') { | |||
1164 | sp->lno = lno; | |||
1165 | return; | |||
1166 | } | |||
1167 | } else if (len > 1 && p[0] == '/' && p[1] == '*') { | |||
1168 | F_SET(sp, SC_SCR_TOP)(((sp)->flags) |= ((0x00000100))); | |||
1169 | do { | |||
1170 | for (; len > 1; --len, ++p) | |||
1171 | if (p[0] == '*' && p[1] == '/') { | |||
1172 | sp->lno = lno; | |||
1173 | return; | |||
1174 | } | |||
1175 | } while (!db_get(sp, ++lno, 0, &p, &len)); | |||
1176 | } else if (len > 1 && p[0] == '/' && p[1] == '/') { | |||
1177 | F_SET(sp, SC_SCR_TOP)(((sp)->flags) |= ((0x00000100))); | |||
1178 | p += 2; | |||
1179 | len -= 2; | |||
1180 | do { | |||
1181 | for (; len > 1; --len, ++p) | |||
1182 | if (p[0] == '/' && p[1] == '/') { | |||
1183 | sp->lno = lno; | |||
1184 | return; | |||
1185 | } | |||
1186 | } while (!db_get(sp, ++lno, 0, &p, &len)); | |||
1187 | } | |||
1188 | } | |||
1189 | ||||
1190 | /* | |||
1191 | * file_m1 -- | |||
1192 | * First modification check routine. The :next, :prev, :rewind, :tag, | |||
1193 | * :tagpush, :tagpop, ^^ modifications check. | |||
1194 | * | |||
1195 | * PUBLIC: int file_m1(SCR *, int, int); | |||
1196 | */ | |||
1197 | int | |||
1198 | file_m1(SCR *sp, int force, int flags) | |||
1199 | { | |||
1200 | EXF *ep; | |||
1201 | ||||
1202 | ep = sp->ep; | |||
1203 | ||||
1204 | /* If no file loaded, return no modifications. */ | |||
1205 | if (ep == NULL((void *)0)) | |||
1206 | return (0); | |||
1207 | ||||
1208 | /* | |||
1209 | * If the file has been modified, we'll want to write it back or | |||
1210 | * fail. If autowrite is set, we'll write it back automatically, | |||
1211 | * unless force is also set. Otherwise, we fail unless forced or | |||
1212 | * there's another open screen on this file. | |||
1213 | */ | |||
1214 | if (F_ISSET(ep, F_MODIFIED)(((ep)->flags) & ((0x004)))) { | |||
1215 | if (O_ISSET(sp, O_AUTOWRITE)((((&(((sp)))->opts[(((O_AUTOWRITE)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_AUTOWRITE )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_AUTOWRITE) ))].o_cur.val)) { | |||
1216 | if (!force && file_aw(sp, flags)) | |||
1217 | return (1); | |||
1218 | } else if (ep->refcnt <= 1 && !force) { | |||
1219 | msgq(sp, M_ERR, LF_ISSET(FS_POSSIBLE)((flags) & ((0x010))) ? | |||
1220 | "File modified since last complete write; write or use ! to override" : | |||
1221 | "File modified since last complete write; write or use :edit! to override"); | |||
1222 | return (1); | |||
1223 | } | |||
1224 | } | |||
1225 | ||||
1226 | return (file_m3(sp, force)); | |||
1227 | } | |||
1228 | ||||
1229 | /* | |||
1230 | * file_m2 -- | |||
1231 | * Second modification check routine. The :edit, :quit, :recover | |||
1232 | * modifications check. | |||
1233 | * | |||
1234 | * PUBLIC: int file_m2(SCR *, int); | |||
1235 | */ | |||
1236 | int | |||
1237 | file_m2(SCR *sp, int force) | |||
1238 | { | |||
1239 | EXF *ep; | |||
1240 | ||||
1241 | ep = sp->ep; | |||
1242 | ||||
1243 | /* If no file loaded, return no modifications. */ | |||
1244 | if (ep == NULL((void *)0)) | |||
1245 | return (0); | |||
1246 | ||||
1247 | /* | |||
1248 | * If the file has been modified, we'll want to fail, unless forced | |||
1249 | * or there's another open screen on this file. | |||
1250 | */ | |||
1251 | if (F_ISSET(ep, F_MODIFIED)(((ep)->flags) & ((0x004))) && ep->refcnt <= 1 && !force) { | |||
1252 | msgq(sp, M_ERR, | |||
1253 | "File modified since last complete write; write or use ! to override"); | |||
1254 | return (1); | |||
1255 | } | |||
1256 | ||||
1257 | return (file_m3(sp, force)); | |||
1258 | } | |||
1259 | ||||
1260 | /* | |||
1261 | * file_m3 -- | |||
1262 | * Third modification check routine. | |||
1263 | * | |||
1264 | * PUBLIC: int file_m3(SCR *, int); | |||
1265 | */ | |||
1266 | int | |||
1267 | file_m3(SCR *sp, int force) | |||
1268 | { | |||
1269 | EXF *ep; | |||
1270 | ||||
1271 | ep = sp->ep; | |||
1272 | ||||
1273 | /* If no file loaded, return no modifications. */ | |||
1274 | if (ep == NULL((void *)0)) | |||
1275 | return (0); | |||
1276 | ||||
1277 | /* | |||
1278 | * Don't exit while in a temporary files if the file was ever modified. | |||
1279 | * The problem is that if the user does a ":wq", we write and quit, | |||
1280 | * unlinking the temporary file. Not what the user had in mind at all. | |||
1281 | * We permit writing to temporary files, so that user maps using file | |||
1282 | * system names work with temporary files. | |||
1283 | */ | |||
1284 | if (F_ISSET(sp->frp, FR_TMPEXIT)(((sp->frp)->flags) & ((0x0040))) && ep->refcnt <= 1 && !force) { | |||
1285 | msgq(sp, M_ERR, | |||
1286 | "File is a temporary; exit will discard modifications"); | |||
1287 | return (1); | |||
1288 | } | |||
1289 | return (0); | |||
1290 | } | |||
1291 | ||||
1292 | /* | |||
1293 | * file_aw -- | |||
1294 | * Autowrite routine. If modified, autowrite is set and the readonly bit | |||
1295 | * is not set, write the file. A routine so there's a place to put the | |||
1296 | * comment. | |||
1297 | * | |||
1298 | * PUBLIC: int file_aw(SCR *, int); | |||
1299 | */ | |||
1300 | int | |||
1301 | file_aw(SCR *sp, int flags) | |||
1302 | { | |||
1303 | if (!F_ISSET(sp->ep, F_MODIFIED)(((sp->ep)->flags) & ((0x004)))) | |||
1304 | return (0); | |||
1305 | if (!O_ISSET(sp, O_AUTOWRITE)((((&(((sp)))->opts[(((O_AUTOWRITE)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_AUTOWRITE )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_AUTOWRITE) ))].o_cur.val)) | |||
1306 | return (0); | |||
1307 | ||||
1308 | /* | |||
1309 | * !!! | |||
1310 | * Historic 4BSD vi attempted to write the file if autowrite was set, | |||
1311 | * regardless of the writeability of the file (as defined by the file | |||
1312 | * readonly flag). System V changed this as some point, not attempting | |||
1313 | * autowrite if the file was readonly. This feels like a bug fix to | |||
1314 | * me (e.g. the principle of least surprise is violated if readonly is | |||
1315 | * set and vi writes the file), so I'm compatible with System V. | |||
1316 | */ | |||
1317 | if (O_ISSET(sp, O_READONLY)((((&(((sp)))->opts[(((O_READONLY)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_READONLY )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_READONLY)) )].o_cur.val)) { | |||
1318 | msgq(sp, M_INFO, | |||
1319 | "File readonly, modifications not auto-written"); | |||
1320 | return (1); | |||
1321 | } | |||
1322 | return (file_write(sp, NULL((void *)0), NULL((void *)0), NULL((void *)0), flags)); | |||
1323 | } | |||
1324 | ||||
1325 | /* | |||
1326 | * set_alt_name -- | |||
1327 | * Set the alternate pathname. | |||
1328 | * | |||
1329 | * Set the alternate pathname. It's a routine because I wanted some place | |||
1330 | * to hang this comment. The alternate pathname (normally referenced using | |||
1331 | * the special character '#' during file expansion and in the vi ^^ command) | |||
1332 | * is set by almost all ex commands that take file names as arguments. The | |||
1333 | * rules go something like this: | |||
1334 | * | |||
1335 | * 1: If any ex command takes a file name as an argument (except for the | |||
1336 | * :next command), the alternate pathname is set to that file name. | |||
1337 | * This excludes the command ":e" and ":w !command" as no file name | |||
1338 | * was specified. Note, historically, the :source command did not set | |||
1339 | * the alternate pathname. It does in nvi, for consistency. | |||
1340 | * | |||
1341 | * 2: However, if any ex command sets the current pathname, e.g. the | |||
1342 | * ":e file" or ":rew" commands succeed, then the alternate pathname | |||
1343 | * is set to the previous file's current pathname, if it had one. | |||
1344 | * This includes the ":file" command and excludes the ":e" command. | |||
1345 | * So, by rule #1 and rule #2, if ":edit foo" fails, the alternate | |||
1346 | * pathname will be "foo", if it succeeds, the alternate pathname will | |||
1347 | * be the previous current pathname. The ":e" command will not set | |||
1348 | * the alternate or current pathnames regardless. | |||
1349 | * | |||
1350 | * 3: However, if it's a read or write command with a file argument and | |||
1351 | * the current pathname has not yet been set, the file name becomes | |||
1352 | * the current pathname, and the alternate pathname is unchanged. | |||
1353 | * | |||
1354 | * If the user edits a temporary file, there may be times when there is no | |||
1355 | * alternative file name. A name argument of NULL turns it off. | |||
1356 | * | |||
1357 | * PUBLIC: void set_alt_name(SCR *, char *); | |||
1358 | */ | |||
1359 | void | |||
1360 | set_alt_name(SCR *sp, char *name) | |||
1361 | { | |||
1362 | free(sp->alt_name); | |||
1363 | if (name == NULL((void *)0)) | |||
1364 | sp->alt_name = NULL((void *)0); | |||
1365 | else if ((sp->alt_name = strdup(name)) == NULL((void *)0)) | |||
1366 | msgq(sp, M_SYSERR, NULL((void *)0)); | |||
1367 | } | |||
1368 | ||||
1369 | /* | |||
1370 | * file_lock -- | |||
1371 | * Get an exclusive lock on a file. | |||
1372 | * | |||
1373 | * PUBLIC: lockr_t file_lock(SCR *, char *, int *, int, int); | |||
1374 | */ | |||
1375 | lockr_t | |||
1376 | file_lock(SCR *sp, char *name, int *fdp, int fd, int iswrite) | |||
1377 | { | |||
1378 | if (!O_ISSET(sp, O_LOCKFILES)((((&(((sp)))->opts[(((O_LOCKFILES)))])->flags) & ((0x01))) ? (((sp)))->gp->opts[(((sp)))->opts[(((O_LOCKFILES )))].o_cur.val].o_cur.val : (((sp)))->opts[(((O_LOCKFILES) ))].o_cur.val)) | |||
1379 | return (LOCK_SUCCESS); | |||
1380 | ||||
1381 | /* Set close-on-exec flag so locks are not inherited by shell cmd. */ | |||
1382 | if (fcntl(fd, F_SETFD2, FD_CLOEXEC1) == -1) | |||
1383 | msgq_str(sp, M_SYSERR, name, "%s"); | |||
1384 | ||||
1385 | /* | |||
1386 | * !!! | |||
1387 | * We need to distinguish a lock not being available for the file | |||
1388 | * from the file system not supporting locking. Flock is documented | |||
1389 | * as returning EWOULDBLOCK; add EAGAIN for good measure, and assume | |||
1390 | * they are the former. There's no portable way to do this. | |||
1391 | */ | |||
1392 | errno(*__errno()) = 0; | |||
1393 | return (flock(fd, LOCK_EX0x02 | LOCK_NB0x04) ? | |||
1394 | errno(*__errno()) == EAGAIN35 || errno(*__errno()) == EWOULDBLOCK35 ? LOCK_UNAVAIL : LOCK_FAILED : | |||
1395 | LOCK_SUCCESS); | |||
1396 | } |