Commit | Line | Data |
---|---|---|
d60d9f65 SS |
1 | /* histfile.c - functions to manipulate the history file. */ |
2 | ||
cb41b9e7 | 3 | /* Copyright (C) 1989-2018 Free Software Foundation, Inc. |
d60d9f65 | 4 | |
cc88a640 | 5 | This file contains the GNU History Library (History), a set of |
d60d9f65 SS |
6 | routines for managing the text of previously typed lines. |
7 | ||
cc88a640 | 8 | History is free software: you can redistribute it and/or modify |
d60d9f65 | 9 | it under the terms of the GNU General Public License as published by |
cc88a640 JK |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
d60d9f65 | 12 | |
cc88a640 JK |
13 | History is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
d60d9f65 | 17 | |
cc88a640 JK |
18 | You should have received a copy of the GNU General Public License |
19 | along with History. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
d60d9f65 SS |
21 | |
22 | /* The goal is to make the implementation transparent, so that you | |
23 | don't have to know what data types are used, just what functions | |
24 | you can call. I think I have done that. */ | |
5bdf8622 | 25 | |
d60d9f65 SS |
26 | #define READLINE_LIBRARY |
27 | ||
5bdf8622 DJ |
28 | #if defined (__TANDEM) |
29 | # include <floss.h> | |
30 | #endif | |
31 | ||
d60d9f65 SS |
32 | #if defined (HAVE_CONFIG_H) |
33 | # include <config.h> | |
34 | #endif | |
35 | ||
36 | #include <stdio.h> | |
37 | ||
775e241e TT |
38 | #if defined (HAVE_LIMITS_H) |
39 | # include <limits.h> | |
40 | #endif | |
41 | ||
d60d9f65 | 42 | #include <sys/types.h> |
5bdf8622 | 43 | #if ! defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
d60d9f65 SS |
44 | # include <sys/file.h> |
45 | #endif | |
1b17e766 | 46 | #include "posixstat.h" |
d60d9f65 SS |
47 | #include <fcntl.h> |
48 | ||
49 | #if defined (HAVE_STDLIB_H) | |
50 | # include <stdlib.h> | |
51 | #else | |
52 | # include "ansi_stdlib.h" | |
53 | #endif /* HAVE_STDLIB_H */ | |
54 | ||
55 | #if defined (HAVE_UNISTD_H) | |
56 | # include <unistd.h> | |
57 | #endif | |
58 | ||
cc88a640 JK |
59 | #include <ctype.h> |
60 | ||
61 | #if defined (__EMX__) | |
9255ee31 EZ |
62 | # undef HAVE_MMAP |
63 | #endif | |
64 | ||
5bdf8622 | 65 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
66 | # include <sys/mman.h> |
67 | ||
68 | # ifdef MAP_FILE | |
69 | # define MAP_RFLAGS (MAP_FILE|MAP_PRIVATE) | |
70 | # define MAP_WFLAGS (MAP_FILE|MAP_SHARED) | |
71 | # else | |
72 | # define MAP_RFLAGS MAP_PRIVATE | |
73 | # define MAP_WFLAGS MAP_SHARED | |
74 | # endif | |
75 | ||
76 | # ifndef MAP_FAILED | |
77 | # define MAP_FAILED ((void *)-1) | |
78 | # endif | |
d60d9f65 | 79 | |
5bdf8622 | 80 | #endif /* HISTORY_USE_MMAP */ |
1b17e766 EZ |
81 | |
82 | /* If we're compiling for __EMX__ (OS/2) or __CYGWIN__ (cygwin32 environment | |
83 | on win 95/98/nt), we want to open files with O_BINARY mode so that there | |
84 | is no \n -> \r\n conversion performed. On other systems, we don't want to | |
85 | mess around with O_BINARY at all, so we ensure that it's defined to 0. */ | |
86 | #if defined (__EMX__) || defined (__CYGWIN__) | |
d60d9f65 SS |
87 | # ifndef O_BINARY |
88 | # define O_BINARY 0 | |
89 | # endif | |
1b17e766 | 90 | #else /* !__EMX__ && !__CYGWIN__ */ |
d60d9f65 SS |
91 | # undef O_BINARY |
92 | # define O_BINARY 0 | |
1b17e766 | 93 | #endif /* !__EMX__ && !__CYGWIN__ */ |
d60d9f65 SS |
94 | |
95 | #include <errno.h> | |
96 | #if !defined (errno) | |
97 | extern int errno; | |
98 | #endif /* !errno */ | |
99 | ||
100 | #include "history.h" | |
101 | #include "histlib.h" | |
102 | ||
1b17e766 EZ |
103 | #include "rlshell.h" |
104 | #include "xmalloc.h" | |
d60d9f65 | 105 | |
775e241e TT |
106 | #if !defined (PATH_MAX) |
107 | # define PATH_MAX 1024 /* default */ | |
108 | #endif | |
109 | ||
110 | extern void _hs_append_history_line PARAMS((int, const char *)); | |
111 | ||
112 | /* history file version; currently unused */ | |
113 | int history_file_version = 1; | |
114 | ||
5bdf8622 DJ |
115 | /* If non-zero, we write timestamps to the history file in history_do_write() */ |
116 | int history_write_timestamps = 0; | |
117 | ||
775e241e TT |
118 | /* If non-zero, we assume that a history file that starts with a timestamp |
119 | uses timestamp-delimited entries and can include multi-line history | |
120 | entries. Used by read_history_range */ | |
121 | int history_multiline_entries = 0; | |
122 | ||
123 | /* Immediately after a call to read_history() or read_history_range(), this | |
124 | will return the number of lines just read from the history file in that | |
125 | call. */ | |
126 | int history_lines_read_from_file = 0; | |
127 | ||
128 | /* Immediately after a call to write_history() or history_do_write(), this | |
129 | will return the number of lines just written to the history file in that | |
130 | call. This also works with history_truncate_file. */ | |
131 | int history_lines_written_to_file = 0; | |
132 | ||
5bdf8622 DJ |
133 | /* Does S look like the beginning of a history timestamp entry? Placeholder |
134 | for more extensive tests. */ | |
775e241e TT |
135 | #define HIST_TIMESTAMP_START(s) (*(s) == history_comment_char && isdigit ((unsigned char)(s)[1]) ) |
136 | ||
137 | static char *history_backupfile PARAMS((const char *)); | |
138 | static char *history_tempfile PARAMS((const char *)); | |
139 | static int histfile_backup PARAMS((const char *, const char *)); | |
140 | static int histfile_restore PARAMS((const char *, const char *)); | |
5bdf8622 | 141 | |
d60d9f65 SS |
142 | /* Return the string that should be used in the place of this |
143 | filename. This only matters when you don't specify the | |
144 | filename to read_history (), or write_history (). */ | |
145 | static char * | |
cb41b9e7 | 146 | history_filename (const char *filename) |
d60d9f65 | 147 | { |
9255ee31 EZ |
148 | char *return_val; |
149 | const char *home; | |
d60d9f65 SS |
150 | int home_len; |
151 | ||
152 | return_val = filename ? savestring (filename) : (char *)NULL; | |
153 | ||
154 | if (return_val) | |
155 | return (return_val); | |
156 | ||
9255ee31 | 157 | home = sh_get_env_value ("HOME"); |
775e241e TT |
158 | #if defined (_WIN32) |
159 | if (home == 0) | |
7f3c5ec8 EZ |
160 | home = sh_get_env_value ("APPDATA"); |
161 | #endif | |
4a11f206 PP |
162 | |
163 | if (home == 0) | |
775e241e | 164 | return (NULL); |
d60d9f65 SS |
165 | else |
166 | home_len = strlen (home); | |
167 | ||
9255ee31 | 168 | return_val = (char *)xmalloc (2 + home_len + 8); /* strlen(".history") == 8 */ |
d60d9f65 SS |
169 | strcpy (return_val, home); |
170 | return_val[home_len] = '/'; | |
1b17e766 EZ |
171 | #if defined (__MSDOS__) |
172 | strcpy (return_val + home_len + 1, "_history"); | |
173 | #else | |
d60d9f65 | 174 | strcpy (return_val + home_len + 1, ".history"); |
1b17e766 | 175 | #endif |
d60d9f65 SS |
176 | |
177 | return (return_val); | |
178 | } | |
179 | ||
775e241e | 180 | static char * |
cb41b9e7 | 181 | history_backupfile (const char *filename) |
775e241e TT |
182 | { |
183 | const char *fn; | |
184 | char *ret, linkbuf[PATH_MAX+1]; | |
185 | size_t len; | |
186 | ssize_t n; | |
187 | struct stat fs; | |
188 | ||
189 | fn = filename; | |
190 | #if defined (HAVE_READLINK) | |
191 | /* Follow symlink to avoid backing up symlink itself; call will fail if | |
192 | not a symlink */ | |
193 | if ((n = readlink (filename, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
194 | { | |
195 | linkbuf[n] = '\0'; | |
196 | fn = linkbuf; | |
197 | } | |
198 | #endif | |
199 | ||
200 | len = strlen (fn); | |
201 | ret = xmalloc (len + 2); | |
202 | strcpy (ret, fn); | |
203 | ret[len] = '-'; | |
204 | ret[len+1] = '\0'; | |
205 | return ret; | |
206 | } | |
207 | ||
208 | static char * | |
cb41b9e7 | 209 | history_tempfile (const char *filename) |
775e241e TT |
210 | { |
211 | const char *fn; | |
212 | char *ret, linkbuf[PATH_MAX+1]; | |
213 | size_t len; | |
214 | ssize_t n; | |
215 | struct stat fs; | |
216 | int pid; | |
217 | ||
218 | fn = filename; | |
219 | #if defined (HAVE_READLINK) | |
220 | /* Follow symlink so tempfile created in the same directory as any symlinked | |
221 | history file; call will fail if not a symlink */ | |
222 | if ((n = readlink (filename, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
223 | { | |
224 | linkbuf[n] = '\0'; | |
225 | fn = linkbuf; | |
226 | } | |
227 | #endif | |
228 | ||
229 | len = strlen (fn); | |
230 | ret = xmalloc (len + 11); | |
231 | strcpy (ret, fn); | |
232 | ||
233 | pid = (int)getpid (); | |
234 | ||
235 | /* filename-PID.tmp */ | |
236 | ret[len] = '-'; | |
237 | ret[len+1] = (pid / 10000 % 10) + '0'; | |
238 | ret[len+2] = (pid / 1000 % 10) + '0'; | |
239 | ret[len+3] = (pid / 100 % 10) + '0'; | |
240 | ret[len+4] = (pid / 10 % 10) + '0'; | |
241 | ret[len+5] = (pid % 10) + '0'; | |
242 | strcpy (ret + len + 6, ".tmp"); | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
d60d9f65 SS |
247 | /* Add the contents of FILENAME to the history list, a line at a time. |
248 | If FILENAME is NULL, then read from ~/.history. Returns 0 if | |
249 | successful, or errno if not. */ | |
250 | int | |
cb41b9e7 | 251 | read_history (const char *filename) |
d60d9f65 SS |
252 | { |
253 | return (read_history_range (filename, 0, -1)); | |
254 | } | |
255 | ||
256 | /* Read a range of lines from FILENAME, adding them to the history list. | |
257 | Start reading at the FROM'th line and end at the TO'th. If FROM | |
258 | is zero, start at the beginning. If TO is less than FROM, read | |
259 | until the end of the file. If FILENAME is NULL, then read from | |
260 | ~/.history. Returns 0 if successful, or errno if not. */ | |
261 | int | |
cb41b9e7 | 262 | read_history_range (const char *filename, int from, int to) |
d60d9f65 | 263 | { |
5bdf8622 DJ |
264 | register char *line_start, *line_end, *p; |
265 | char *input, *buffer, *bufend, *last_ts; | |
775e241e | 266 | int file, current_line, chars_read, has_timestamps, reset_comment_char; |
d60d9f65 SS |
267 | struct stat finfo; |
268 | size_t file_size; | |
5bdf8622 DJ |
269 | #if defined (EFBIG) |
270 | int overflow_errno = EFBIG; | |
271 | #elif defined (EOVERFLOW) | |
272 | int overflow_errno = EOVERFLOW; | |
273 | #else | |
274 | int overflow_errno = EIO; | |
275 | #endif | |
d60d9f65 | 276 | |
775e241e TT |
277 | history_lines_read_from_file = 0; |
278 | ||
5bdf8622 | 279 | buffer = last_ts = (char *)NULL; |
d60d9f65 | 280 | input = history_filename (filename); |
cc88a640 | 281 | file = input ? open (input, O_RDONLY|O_BINARY, 0666) : -1; |
d60d9f65 SS |
282 | |
283 | if ((file < 0) || (fstat (file, &finfo) == -1)) | |
284 | goto error_and_exit; | |
285 | ||
cb41b9e7 TT |
286 | if (S_ISREG (finfo.st_mode) == 0) |
287 | { | |
288 | #ifdef EFTYPE | |
289 | errno = EFTYPE; | |
290 | #else | |
291 | errno = EINVAL; | |
292 | #endif | |
293 | goto error_and_exit; | |
294 | } | |
295 | ||
d60d9f65 SS |
296 | file_size = (size_t)finfo.st_size; |
297 | ||
298 | /* check for overflow on very large files */ | |
299 | if (file_size != finfo.st_size || file_size + 1 < file_size) | |
300 | { | |
5bdf8622 | 301 | errno = overflow_errno; |
d60d9f65 SS |
302 | goto error_and_exit; |
303 | } | |
304 | ||
cb41b9e7 TT |
305 | if (file_size == 0) |
306 | { | |
307 | free (input); | |
308 | return 0; /* don't waste time if we don't have to */ | |
309 | } | |
310 | ||
5bdf8622 | 311 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
312 | /* We map read/write and private so we can change newlines to NULs without |
313 | affecting the underlying object. */ | |
314 | buffer = (char *)mmap (0, file_size, PROT_READ|PROT_WRITE, MAP_RFLAGS, file, 0); | |
315 | if ((void *)buffer == MAP_FAILED) | |
5bdf8622 DJ |
316 | { |
317 | errno = overflow_errno; | |
318 | goto error_and_exit; | |
319 | } | |
9255ee31 EZ |
320 | chars_read = file_size; |
321 | #else | |
322 | buffer = (char *)malloc (file_size + 1); | |
323 | if (buffer == 0) | |
5bdf8622 DJ |
324 | { |
325 | errno = overflow_errno; | |
326 | goto error_and_exit; | |
327 | } | |
1b17e766 EZ |
328 | |
329 | chars_read = read (file, buffer, file_size); | |
9255ee31 | 330 | #endif |
1b17e766 | 331 | if (chars_read < 0) |
d60d9f65 SS |
332 | { |
333 | error_and_exit: | |
5bdf8622 DJ |
334 | if (errno != 0) |
335 | chars_read = errno; | |
336 | else | |
337 | chars_read = EIO; | |
d60d9f65 SS |
338 | if (file >= 0) |
339 | close (file); | |
340 | ||
341 | FREE (input); | |
5bdf8622 | 342 | #ifndef HISTORY_USE_MMAP |
d60d9f65 | 343 | FREE (buffer); |
9255ee31 | 344 | #endif |
d60d9f65 | 345 | |
9255ee31 | 346 | return (chars_read); |
d60d9f65 SS |
347 | } |
348 | ||
349 | close (file); | |
350 | ||
351 | /* Set TO to larger than end of file if negative. */ | |
352 | if (to < 0) | |
1b17e766 | 353 | to = chars_read; |
d60d9f65 SS |
354 | |
355 | /* Start at beginning of file, work to end. */ | |
9255ee31 | 356 | bufend = buffer + chars_read; |
cb41b9e7 | 357 | *bufend = '\0'; /* null-terminate buffer for timestamp checks */ |
9255ee31 | 358 | current_line = 0; |
d60d9f65 | 359 | |
775e241e TT |
360 | /* Heuristic: the history comment character rarely changes, so assume we |
361 | have timestamps if the buffer starts with `#[:digit:]' and temporarily | |
362 | set history_comment_char so timestamp parsing works right */ | |
363 | reset_comment_char = 0; | |
364 | if (history_comment_char == '\0' && buffer[0] == '#' && isdigit ((unsigned char)buffer[1])) | |
365 | { | |
366 | history_comment_char = '#'; | |
367 | reset_comment_char = 1; | |
368 | } | |
369 | ||
370 | has_timestamps = HIST_TIMESTAMP_START (buffer); | |
371 | history_multiline_entries += has_timestamps && history_write_timestamps; | |
372 | ||
d60d9f65 | 373 | /* Skip lines until we are at FROM. */ |
9255ee31 EZ |
374 | for (line_start = line_end = buffer; line_end < bufend && current_line < from; line_end++) |
375 | if (*line_end == '\n') | |
376 | { | |
5bdf8622 DJ |
377 | p = line_end + 1; |
378 | /* If we see something we think is a timestamp, continue with this | |
379 | line. We should check more extensively here... */ | |
380 | if (HIST_TIMESTAMP_START(p) == 0) | |
381 | current_line++; | |
382 | line_start = p; | |
9255ee31 | 383 | } |
d60d9f65 SS |
384 | |
385 | /* If there are lines left to gobble, then gobble them now. */ | |
9255ee31 EZ |
386 | for (line_end = line_start; line_end < bufend; line_end++) |
387 | if (*line_end == '\n') | |
d60d9f65 | 388 | { |
cc88a640 JK |
389 | /* Change to allow Windows-like \r\n end of line delimiter. */ |
390 | if (line_end > line_start && line_end[-1] == '\r') | |
391 | line_end[-1] = '\0'; | |
a75b402a DJ |
392 | else |
393 | *line_end = '\0'; | |
d60d9f65 | 394 | |
9255ee31 | 395 | if (*line_start) |
5bdf8622 DJ |
396 | { |
397 | if (HIST_TIMESTAMP_START(line_start) == 0) | |
398 | { | |
cb41b9e7 | 399 | if (last_ts == NULL && history_length > 0 && history_multiline_entries) |
775e241e TT |
400 | _hs_append_history_line (history_length - 1, line_start); |
401 | else | |
402 | add_history (line_start); | |
5bdf8622 DJ |
403 | if (last_ts) |
404 | { | |
405 | add_history_time (last_ts); | |
406 | last_ts = NULL; | |
407 | } | |
408 | } | |
409 | else | |
410 | { | |
411 | last_ts = line_start; | |
412 | current_line--; | |
413 | } | |
414 | } | |
d60d9f65 SS |
415 | |
416 | current_line++; | |
417 | ||
418 | if (current_line >= to) | |
419 | break; | |
420 | ||
421 | line_start = line_end + 1; | |
422 | } | |
423 | ||
775e241e TT |
424 | history_lines_read_from_file = current_line; |
425 | if (reset_comment_char) | |
426 | history_comment_char = '\0'; | |
427 | ||
d60d9f65 | 428 | FREE (input); |
5bdf8622 | 429 | #ifndef HISTORY_USE_MMAP |
d60d9f65 | 430 | FREE (buffer); |
9255ee31 EZ |
431 | #else |
432 | munmap (buffer, file_size); | |
433 | #endif | |
d60d9f65 SS |
434 | |
435 | return (0); | |
436 | } | |
437 | ||
775e241e TT |
438 | /* Save FILENAME to BACK, handling case where FILENAME is a symlink |
439 | (e.g., ~/.bash_history -> .histfiles/.bash_history.$HOSTNAME) */ | |
440 | static int | |
cb41b9e7 | 441 | histfile_backup (const char *filename, const char *back) |
775e241e TT |
442 | { |
443 | #if defined (HAVE_READLINK) | |
444 | char linkbuf[PATH_MAX+1]; | |
445 | ssize_t n; | |
446 | ||
447 | /* Follow to target of symlink to avoid renaming symlink itself */ | |
448 | if ((n = readlink (filename, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
449 | { | |
450 | linkbuf[n] = '\0'; | |
451 | return (rename (linkbuf, back)); | |
452 | } | |
453 | #endif | |
454 | return (rename (filename, back)); | |
455 | } | |
456 | ||
457 | /* Restore ORIG from BACKUP handling case where ORIG is a symlink | |
458 | (e.g., ~/.bash_history -> .histfiles/.bash_history.$HOSTNAME) */ | |
459 | static int | |
cb41b9e7 | 460 | histfile_restore (const char *backup, const char *orig) |
775e241e TT |
461 | { |
462 | #if defined (HAVE_READLINK) | |
463 | char linkbuf[PATH_MAX+1]; | |
464 | ssize_t n; | |
465 | ||
466 | /* Follow to target of symlink to avoid renaming symlink itself */ | |
467 | if ((n = readlink (orig, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
468 | { | |
469 | linkbuf[n] = '\0'; | |
470 | return (rename (backup, linkbuf)); | |
471 | } | |
472 | #endif | |
473 | return (rename (backup, orig)); | |
474 | } | |
475 | ||
d60d9f65 | 476 | /* Truncate the history file FNAME, leaving only LINES trailing lines. |
775e241e TT |
477 | If FNAME is NULL, then use ~/.history. Writes a new file and renames |
478 | it to the original name. Returns 0 on success, errno on failure. */ | |
d60d9f65 | 479 | int |
cb41b9e7 | 480 | history_truncate_file (const char *fname, int lines) |
d60d9f65 | 481 | { |
775e241e TT |
482 | char *buffer, *filename, *tempname, *bp, *bp1; /* bp1 == bp+1 */ |
483 | int file, chars_read, rv, orig_lines, exists, r; | |
d60d9f65 SS |
484 | struct stat finfo; |
485 | size_t file_size; | |
486 | ||
775e241e TT |
487 | history_lines_written_to_file = 0; |
488 | ||
d60d9f65 SS |
489 | buffer = (char *)NULL; |
490 | filename = history_filename (fname); | |
775e241e | 491 | tempname = 0; |
cc88a640 | 492 | file = filename ? open (filename, O_RDONLY|O_BINARY, 0666) : -1; |
775e241e | 493 | rv = exists = 0; |
d60d9f65 | 494 | |
9255ee31 | 495 | /* Don't try to truncate non-regular files. */ |
d60d9f65 | 496 | if (file == -1 || fstat (file, &finfo) == -1) |
9255ee31 EZ |
497 | { |
498 | rv = errno; | |
499 | if (file != -1) | |
500 | close (file); | |
501 | goto truncate_exit; | |
502 | } | |
775e241e | 503 | exists = 1; |
d60d9f65 | 504 | |
9255ee31 EZ |
505 | if (S_ISREG (finfo.st_mode) == 0) |
506 | { | |
507 | close (file); | |
508 | #ifdef EFTYPE | |
509 | rv = EFTYPE; | |
510 | #else | |
511 | rv = EINVAL; | |
512 | #endif | |
513 | goto truncate_exit; | |
514 | } | |
1b17e766 | 515 | |
d60d9f65 SS |
516 | file_size = (size_t)finfo.st_size; |
517 | ||
518 | /* check for overflow on very large files */ | |
519 | if (file_size != finfo.st_size || file_size + 1 < file_size) | |
520 | { | |
521 | close (file); | |
522 | #if defined (EFBIG) | |
9255ee31 EZ |
523 | rv = errno = EFBIG; |
524 | #elif defined (EOVERFLOW) | |
525 | rv = errno = EOVERFLOW; | |
526 | #else | |
527 | rv = errno = EINVAL; | |
d60d9f65 SS |
528 | #endif |
529 | goto truncate_exit; | |
530 | } | |
531 | ||
9255ee31 EZ |
532 | buffer = (char *)malloc (file_size + 1); |
533 | if (buffer == 0) | |
534 | { | |
775e241e | 535 | rv = errno; |
9255ee31 EZ |
536 | close (file); |
537 | goto truncate_exit; | |
538 | } | |
539 | ||
d60d9f65 SS |
540 | chars_read = read (file, buffer, file_size); |
541 | close (file); | |
542 | ||
543 | if (chars_read <= 0) | |
9255ee31 EZ |
544 | { |
545 | rv = (chars_read < 0) ? errno : 0; | |
546 | goto truncate_exit; | |
547 | } | |
d60d9f65 | 548 | |
775e241e | 549 | orig_lines = lines; |
d60d9f65 | 550 | /* Count backwards from the end of buffer until we have passed |
5bdf8622 DJ |
551 | LINES lines. bp1 is set funny initially. But since bp[1] can't |
552 | be a comment character (since it's off the end) and *bp can't be | |
553 | both a newline and the history comment character, it should be OK. */ | |
554 | for (bp1 = bp = buffer + chars_read - 1; lines && bp > buffer; bp--) | |
d60d9f65 | 555 | { |
5bdf8622 | 556 | if (*bp == '\n' && HIST_TIMESTAMP_START(bp1) == 0) |
d60d9f65 | 557 | lines--; |
5bdf8622 | 558 | bp1 = bp; |
d60d9f65 SS |
559 | } |
560 | ||
561 | /* If this is the first line, then the file contains exactly the | |
562 | number of lines we want to truncate to, so we don't need to do | |
563 | anything. It's the first line if we don't find a newline between | |
564 | the current value of i and 0. Otherwise, write from the start of | |
565 | this line until the end of the buffer. */ | |
9255ee31 | 566 | for ( ; bp > buffer; bp--) |
5bdf8622 DJ |
567 | { |
568 | if (*bp == '\n' && HIST_TIMESTAMP_START(bp1) == 0) | |
569 | { | |
570 | bp++; | |
571 | break; | |
572 | } | |
573 | bp1 = bp; | |
574 | } | |
d60d9f65 SS |
575 | |
576 | /* Write only if there are more lines in the file than we want to | |
577 | truncate to. */ | |
775e241e TT |
578 | if (bp <= buffer) |
579 | { | |
580 | rv = 0; | |
581 | /* No-op if LINES == 0 at this point */ | |
582 | history_lines_written_to_file = orig_lines - lines; | |
583 | goto truncate_exit; | |
584 | } | |
585 | ||
586 | tempname = history_tempfile (filename); | |
587 | ||
588 | if ((file = open (tempname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0600)) != -1) | |
d60d9f65 | 589 | { |
16bfc2f9 AH |
590 | if (write (file, bp, chars_read - (bp - buffer)) < 0) |
591 | rv = errno; | |
c862e87b | 592 | |
775e241e TT |
593 | if (close (file) < 0 && rv == 0) |
594 | rv = errno; | |
d60d9f65 | 595 | } |
775e241e TT |
596 | else |
597 | rv = errno; | |
d60d9f65 SS |
598 | |
599 | truncate_exit: | |
5836a818 | 600 | FREE (buffer); |
4a11f206 | 601 | |
775e241e TT |
602 | history_lines_written_to_file = orig_lines - lines; |
603 | ||
604 | if (rv == 0 && filename && tempname) | |
605 | rv = histfile_restore (tempname, filename); | |
606 | ||
607 | if (rv != 0) | |
608 | { | |
609 | if (tempname) | |
610 | unlink (tempname); | |
611 | history_lines_written_to_file = 0; | |
612 | } | |
613 | ||
cb41b9e7 | 614 | #if defined (HAVE_CHOWN) |
775e241e TT |
615 | /* Make sure the new filename is owned by the same user as the old. If one |
616 | user is running this, it's a no-op. If the shell is running after sudo | |
617 | with a shared history file, we don't want to leave the history file | |
618 | owned by root. */ | |
619 | if (rv == 0 && exists) | |
620 | r = chown (filename, finfo.st_uid, finfo.st_gid); | |
cb41b9e7 | 621 | #endif |
775e241e | 622 | |
cc88a640 | 623 | xfree (filename); |
775e241e TT |
624 | FREE (tempname); |
625 | ||
9255ee31 | 626 | return rv; |
d60d9f65 SS |
627 | } |
628 | ||
775e241e | 629 | /* Workhorse function for writing history. Writes the last NELEMENT entries |
d60d9f65 SS |
630 | from the history list to FILENAME. OVERWRITE is non-zero if you |
631 | wish to replace FILENAME with the entries. */ | |
632 | static int | |
cb41b9e7 | 633 | history_do_write (const char *filename, int nelements, int overwrite) |
d60d9f65 SS |
634 | { |
635 | register int i; | |
775e241e TT |
636 | char *output, *tempname, *histname; |
637 | int file, mode, rv, exists; | |
638 | struct stat finfo; | |
5bdf8622 | 639 | #ifdef HISTORY_USE_MMAP |
9255ee31 | 640 | size_t cursize; |
d60d9f65 | 641 | |
775e241e TT |
642 | history_lines_written_to_file = 0; |
643 | ||
9255ee31 EZ |
644 | mode = overwrite ? O_RDWR|O_CREAT|O_TRUNC|O_BINARY : O_RDWR|O_APPEND|O_BINARY; |
645 | #else | |
d60d9f65 | 646 | mode = overwrite ? O_WRONLY|O_CREAT|O_TRUNC|O_BINARY : O_WRONLY|O_APPEND|O_BINARY; |
9255ee31 | 647 | #endif |
775e241e TT |
648 | histname = history_filename (filename); |
649 | exists = histname ? (stat (histname, &finfo) == 0) : 0; | |
650 | ||
651 | tempname = (overwrite && exists && S_ISREG (finfo.st_mode)) ? history_tempfile (histname) : 0; | |
652 | output = tempname ? tempname : histname; | |
653 | ||
cc88a640 | 654 | file = output ? open (output, mode, 0600) : -1; |
9255ee31 | 655 | rv = 0; |
d60d9f65 | 656 | |
cc88a640 | 657 | if (file == -1) |
d60d9f65 | 658 | { |
775e241e TT |
659 | rv = errno; |
660 | FREE (histname); | |
661 | FREE (tempname); | |
662 | return (rv); | |
d60d9f65 SS |
663 | } |
664 | ||
5bdf8622 | 665 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
666 | cursize = overwrite ? 0 : lseek (file, 0, SEEK_END); |
667 | #endif | |
668 | ||
d60d9f65 SS |
669 | if (nelements > history_length) |
670 | nelements = history_length; | |
671 | ||
672 | /* Build a buffer of all the lines to write, and write them in one syscall. | |
673 | Suggested by Peter Ho (peter@robosts.oxford.ac.uk). */ | |
674 | { | |
675 | HIST_ENTRY **the_history; /* local */ | |
676 | register int j; | |
677 | int buffer_size; | |
678 | char *buffer; | |
679 | ||
680 | the_history = history_list (); | |
681 | /* Calculate the total number of bytes to write. */ | |
682 | for (buffer_size = 0, i = history_length - nelements; i < history_length; i++) | |
5bdf8622 DJ |
683 | #if 0 |
684 | buffer_size += 2 + HISTENT_BYTES (the_history[i]); | |
685 | #else | |
686 | { | |
687 | if (history_write_timestamps && the_history[i]->timestamp && the_history[i]->timestamp[0]) | |
688 | buffer_size += strlen (the_history[i]->timestamp) + 1; | |
689 | buffer_size += strlen (the_history[i]->line) + 1; | |
690 | } | |
691 | #endif | |
d60d9f65 SS |
692 | |
693 | /* Allocate the buffer, and fill it. */ | |
5bdf8622 | 694 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
695 | if (ftruncate (file, buffer_size+cursize) == -1) |
696 | goto mmap_error; | |
697 | buffer = (char *)mmap (0, buffer_size, PROT_READ|PROT_WRITE, MAP_WFLAGS, file, cursize); | |
698 | if ((void *)buffer == MAP_FAILED) | |
699 | { | |
700 | mmap_error: | |
701 | rv = errno; | |
9255ee31 | 702 | close (file); |
775e241e TT |
703 | if (tempname) |
704 | unlink (tempname); | |
705 | FREE (histname); | |
706 | FREE (tempname); | |
9255ee31 EZ |
707 | return rv; |
708 | } | |
709 | #else | |
710 | buffer = (char *)malloc (buffer_size); | |
711 | if (buffer == 0) | |
712 | { | |
713 | rv = errno; | |
9255ee31 | 714 | close (file); |
775e241e TT |
715 | if (tempname) |
716 | unlink (tempname); | |
717 | FREE (histname); | |
718 | FREE (tempname); | |
9255ee31 EZ |
719 | return rv; |
720 | } | |
721 | #endif | |
d60d9f65 SS |
722 | |
723 | for (j = 0, i = history_length - nelements; i < history_length; i++) | |
724 | { | |
5bdf8622 DJ |
725 | if (history_write_timestamps && the_history[i]->timestamp && the_history[i]->timestamp[0]) |
726 | { | |
727 | strcpy (buffer + j, the_history[i]->timestamp); | |
728 | j += strlen (the_history[i]->timestamp); | |
729 | buffer[j++] = '\n'; | |
730 | } | |
d60d9f65 SS |
731 | strcpy (buffer + j, the_history[i]->line); |
732 | j += strlen (the_history[i]->line); | |
733 | buffer[j++] = '\n'; | |
734 | } | |
735 | ||
5bdf8622 | 736 | #ifdef HISTORY_USE_MMAP |
775e241e | 737 | if (msync (buffer, buffer_size, MS_ASYNC) != 0 || munmap (buffer, buffer_size) != 0) |
9255ee31 EZ |
738 | rv = errno; |
739 | #else | |
740 | if (write (file, buffer, buffer_size) < 0) | |
741 | rv = errno; | |
cc88a640 | 742 | xfree (buffer); |
9255ee31 | 743 | #endif |
d60d9f65 SS |
744 | } |
745 | ||
775e241e TT |
746 | history_lines_written_to_file = nelements; |
747 | ||
748 | if (close (file) < 0 && rv == 0) | |
749 | rv = errno; | |
750 | ||
751 | if (rv == 0 && histname && tempname) | |
752 | rv = histfile_restore (tempname, histname); | |
753 | ||
754 | if (rv != 0) | |
755 | { | |
756 | if (tempname) | |
757 | unlink (tempname); | |
758 | history_lines_written_to_file = 0; | |
759 | } | |
760 | ||
cb41b9e7 | 761 | #if defined (HAVE_CHOWN) |
775e241e TT |
762 | /* Make sure the new filename is owned by the same user as the old. If one |
763 | user is running this, it's a no-op. If the shell is running after sudo | |
764 | with a shared history file, we don't want to leave the history file | |
765 | owned by root. */ | |
766 | if (rv == 0 && exists) | |
767 | mode = chown (histname, finfo.st_uid, finfo.st_gid); | |
cb41b9e7 | 768 | #endif |
d60d9f65 | 769 | |
775e241e TT |
770 | FREE (histname); |
771 | FREE (tempname); | |
d60d9f65 | 772 | |
9255ee31 | 773 | return (rv); |
d60d9f65 SS |
774 | } |
775 | ||
776 | /* Append NELEMENT entries to FILENAME. The entries appended are from | |
777 | the end of the list minus NELEMENTs up to the end of the list. */ | |
778 | int | |
cb41b9e7 | 779 | append_history (int nelements, const char *filename) |
d60d9f65 SS |
780 | { |
781 | return (history_do_write (filename, nelements, HISTORY_APPEND)); | |
782 | } | |
783 | ||
784 | /* Overwrite FILENAME with the current history. If FILENAME is NULL, | |
785 | then write the history list to ~/.history. Values returned | |
786 | are as in read_history ().*/ | |
787 | int | |
cb41b9e7 | 788 | write_history (const char *filename) |
d60d9f65 SS |
789 | { |
790 | return (history_do_write (filename, history_length, HISTORY_OVERWRITE)); | |
791 | } |