Commit | Line | Data |
---|---|---|
d60d9f65 SS |
1 | /* histfile.c - functions to manipulate the history file. */ |
2 | ||
775e241e | 3 | /* Copyright (C) 1989-2016 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 * | |
146 | history_filename (filename) | |
9255ee31 | 147 | const char *filename; |
d60d9f65 | 148 | { |
9255ee31 EZ |
149 | char *return_val; |
150 | const char *home; | |
d60d9f65 SS |
151 | int home_len; |
152 | ||
153 | return_val = filename ? savestring (filename) : (char *)NULL; | |
154 | ||
155 | if (return_val) | |
156 | return (return_val); | |
157 | ||
9255ee31 | 158 | home = sh_get_env_value ("HOME"); |
775e241e TT |
159 | #if defined (_WIN32) |
160 | if (home == 0) | |
7f3c5ec8 EZ |
161 | home = sh_get_env_value ("APPDATA"); |
162 | #endif | |
4a11f206 PP |
163 | |
164 | if (home == 0) | |
775e241e | 165 | return (NULL); |
d60d9f65 SS |
166 | else |
167 | home_len = strlen (home); | |
168 | ||
9255ee31 | 169 | return_val = (char *)xmalloc (2 + home_len + 8); /* strlen(".history") == 8 */ |
d60d9f65 SS |
170 | strcpy (return_val, home); |
171 | return_val[home_len] = '/'; | |
1b17e766 EZ |
172 | #if defined (__MSDOS__) |
173 | strcpy (return_val + home_len + 1, "_history"); | |
174 | #else | |
d60d9f65 | 175 | strcpy (return_val + home_len + 1, ".history"); |
1b17e766 | 176 | #endif |
d60d9f65 SS |
177 | |
178 | return (return_val); | |
179 | } | |
180 | ||
775e241e TT |
181 | static char * |
182 | history_backupfile (filename) | |
183 | const char *filename; | |
184 | { | |
185 | const char *fn; | |
186 | char *ret, linkbuf[PATH_MAX+1]; | |
187 | size_t len; | |
188 | ssize_t n; | |
189 | struct stat fs; | |
190 | ||
191 | fn = filename; | |
192 | #if defined (HAVE_READLINK) | |
193 | /* Follow symlink to avoid backing up symlink itself; call will fail if | |
194 | not a symlink */ | |
195 | if ((n = readlink (filename, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
196 | { | |
197 | linkbuf[n] = '\0'; | |
198 | fn = linkbuf; | |
199 | } | |
200 | #endif | |
201 | ||
202 | len = strlen (fn); | |
203 | ret = xmalloc (len + 2); | |
204 | strcpy (ret, fn); | |
205 | ret[len] = '-'; | |
206 | ret[len+1] = '\0'; | |
207 | return ret; | |
208 | } | |
209 | ||
210 | static char * | |
211 | history_tempfile (filename) | |
212 | const char *filename; | |
213 | { | |
214 | const char *fn; | |
215 | char *ret, linkbuf[PATH_MAX+1]; | |
216 | size_t len; | |
217 | ssize_t n; | |
218 | struct stat fs; | |
219 | int pid; | |
220 | ||
221 | fn = filename; | |
222 | #if defined (HAVE_READLINK) | |
223 | /* Follow symlink so tempfile created in the same directory as any symlinked | |
224 | history file; call will fail if not a symlink */ | |
225 | if ((n = readlink (filename, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
226 | { | |
227 | linkbuf[n] = '\0'; | |
228 | fn = linkbuf; | |
229 | } | |
230 | #endif | |
231 | ||
232 | len = strlen (fn); | |
233 | ret = xmalloc (len + 11); | |
234 | strcpy (ret, fn); | |
235 | ||
236 | pid = (int)getpid (); | |
237 | ||
238 | /* filename-PID.tmp */ | |
239 | ret[len] = '-'; | |
240 | ret[len+1] = (pid / 10000 % 10) + '0'; | |
241 | ret[len+2] = (pid / 1000 % 10) + '0'; | |
242 | ret[len+3] = (pid / 100 % 10) + '0'; | |
243 | ret[len+4] = (pid / 10 % 10) + '0'; | |
244 | ret[len+5] = (pid % 10) + '0'; | |
245 | strcpy (ret + len + 6, ".tmp"); | |
246 | ||
247 | return ret; | |
248 | } | |
249 | ||
d60d9f65 SS |
250 | /* Add the contents of FILENAME to the history list, a line at a time. |
251 | If FILENAME is NULL, then read from ~/.history. Returns 0 if | |
252 | successful, or errno if not. */ | |
253 | int | |
254 | read_history (filename) | |
9255ee31 | 255 | const char *filename; |
d60d9f65 SS |
256 | { |
257 | return (read_history_range (filename, 0, -1)); | |
258 | } | |
259 | ||
260 | /* Read a range of lines from FILENAME, adding them to the history list. | |
261 | Start reading at the FROM'th line and end at the TO'th. If FROM | |
262 | is zero, start at the beginning. If TO is less than FROM, read | |
263 | until the end of the file. If FILENAME is NULL, then read from | |
264 | ~/.history. Returns 0 if successful, or errno if not. */ | |
265 | int | |
266 | read_history_range (filename, from, to) | |
9255ee31 | 267 | const char *filename; |
d60d9f65 SS |
268 | int from, to; |
269 | { | |
5bdf8622 DJ |
270 | register char *line_start, *line_end, *p; |
271 | char *input, *buffer, *bufend, *last_ts; | |
775e241e | 272 | int file, current_line, chars_read, has_timestamps, reset_comment_char; |
d60d9f65 SS |
273 | struct stat finfo; |
274 | size_t file_size; | |
5bdf8622 DJ |
275 | #if defined (EFBIG) |
276 | int overflow_errno = EFBIG; | |
277 | #elif defined (EOVERFLOW) | |
278 | int overflow_errno = EOVERFLOW; | |
279 | #else | |
280 | int overflow_errno = EIO; | |
281 | #endif | |
d60d9f65 | 282 | |
775e241e TT |
283 | history_lines_read_from_file = 0; |
284 | ||
5bdf8622 | 285 | buffer = last_ts = (char *)NULL; |
d60d9f65 | 286 | input = history_filename (filename); |
cc88a640 | 287 | file = input ? open (input, O_RDONLY|O_BINARY, 0666) : -1; |
d60d9f65 SS |
288 | |
289 | if ((file < 0) || (fstat (file, &finfo) == -1)) | |
290 | goto error_and_exit; | |
291 | ||
292 | file_size = (size_t)finfo.st_size; | |
293 | ||
294 | /* check for overflow on very large files */ | |
295 | if (file_size != finfo.st_size || file_size + 1 < file_size) | |
296 | { | |
5bdf8622 | 297 | errno = overflow_errno; |
d60d9f65 SS |
298 | goto error_and_exit; |
299 | } | |
300 | ||
5bdf8622 | 301 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
302 | /* We map read/write and private so we can change newlines to NULs without |
303 | affecting the underlying object. */ | |
304 | buffer = (char *)mmap (0, file_size, PROT_READ|PROT_WRITE, MAP_RFLAGS, file, 0); | |
305 | if ((void *)buffer == MAP_FAILED) | |
5bdf8622 DJ |
306 | { |
307 | errno = overflow_errno; | |
308 | goto error_and_exit; | |
309 | } | |
9255ee31 EZ |
310 | chars_read = file_size; |
311 | #else | |
312 | buffer = (char *)malloc (file_size + 1); | |
313 | if (buffer == 0) | |
5bdf8622 DJ |
314 | { |
315 | errno = overflow_errno; | |
316 | goto error_and_exit; | |
317 | } | |
1b17e766 EZ |
318 | |
319 | chars_read = read (file, buffer, file_size); | |
9255ee31 | 320 | #endif |
1b17e766 | 321 | if (chars_read < 0) |
d60d9f65 SS |
322 | { |
323 | error_and_exit: | |
5bdf8622 DJ |
324 | if (errno != 0) |
325 | chars_read = errno; | |
326 | else | |
327 | chars_read = EIO; | |
d60d9f65 SS |
328 | if (file >= 0) |
329 | close (file); | |
330 | ||
331 | FREE (input); | |
5bdf8622 | 332 | #ifndef HISTORY_USE_MMAP |
d60d9f65 | 333 | FREE (buffer); |
9255ee31 | 334 | #endif |
d60d9f65 | 335 | |
9255ee31 | 336 | return (chars_read); |
d60d9f65 SS |
337 | } |
338 | ||
339 | close (file); | |
340 | ||
341 | /* Set TO to larger than end of file if negative. */ | |
342 | if (to < 0) | |
1b17e766 | 343 | to = chars_read; |
d60d9f65 SS |
344 | |
345 | /* Start at beginning of file, work to end. */ | |
9255ee31 EZ |
346 | bufend = buffer + chars_read; |
347 | current_line = 0; | |
d60d9f65 | 348 | |
775e241e TT |
349 | /* Heuristic: the history comment character rarely changes, so assume we |
350 | have timestamps if the buffer starts with `#[:digit:]' and temporarily | |
351 | set history_comment_char so timestamp parsing works right */ | |
352 | reset_comment_char = 0; | |
353 | if (history_comment_char == '\0' && buffer[0] == '#' && isdigit ((unsigned char)buffer[1])) | |
354 | { | |
355 | history_comment_char = '#'; | |
356 | reset_comment_char = 1; | |
357 | } | |
358 | ||
359 | has_timestamps = HIST_TIMESTAMP_START (buffer); | |
360 | history_multiline_entries += has_timestamps && history_write_timestamps; | |
361 | ||
d60d9f65 | 362 | /* Skip lines until we are at FROM. */ |
9255ee31 EZ |
363 | for (line_start = line_end = buffer; line_end < bufend && current_line < from; line_end++) |
364 | if (*line_end == '\n') | |
365 | { | |
5bdf8622 DJ |
366 | p = line_end + 1; |
367 | /* If we see something we think is a timestamp, continue with this | |
368 | line. We should check more extensively here... */ | |
369 | if (HIST_TIMESTAMP_START(p) == 0) | |
370 | current_line++; | |
371 | line_start = p; | |
9255ee31 | 372 | } |
d60d9f65 SS |
373 | |
374 | /* If there are lines left to gobble, then gobble them now. */ | |
9255ee31 EZ |
375 | for (line_end = line_start; line_end < bufend; line_end++) |
376 | if (*line_end == '\n') | |
d60d9f65 | 377 | { |
cc88a640 JK |
378 | /* Change to allow Windows-like \r\n end of line delimiter. */ |
379 | if (line_end > line_start && line_end[-1] == '\r') | |
380 | line_end[-1] = '\0'; | |
a75b402a DJ |
381 | else |
382 | *line_end = '\0'; | |
d60d9f65 | 383 | |
9255ee31 | 384 | if (*line_start) |
5bdf8622 DJ |
385 | { |
386 | if (HIST_TIMESTAMP_START(line_start) == 0) | |
387 | { | |
775e241e TT |
388 | if (last_ts == NULL && history_multiline_entries) |
389 | _hs_append_history_line (history_length - 1, line_start); | |
390 | else | |
391 | add_history (line_start); | |
5bdf8622 DJ |
392 | if (last_ts) |
393 | { | |
394 | add_history_time (last_ts); | |
395 | last_ts = NULL; | |
396 | } | |
397 | } | |
398 | else | |
399 | { | |
400 | last_ts = line_start; | |
401 | current_line--; | |
402 | } | |
403 | } | |
d60d9f65 SS |
404 | |
405 | current_line++; | |
406 | ||
407 | if (current_line >= to) | |
408 | break; | |
409 | ||
410 | line_start = line_end + 1; | |
411 | } | |
412 | ||
775e241e TT |
413 | history_lines_read_from_file = current_line; |
414 | if (reset_comment_char) | |
415 | history_comment_char = '\0'; | |
416 | ||
d60d9f65 | 417 | FREE (input); |
5bdf8622 | 418 | #ifndef HISTORY_USE_MMAP |
d60d9f65 | 419 | FREE (buffer); |
9255ee31 EZ |
420 | #else |
421 | munmap (buffer, file_size); | |
422 | #endif | |
d60d9f65 SS |
423 | |
424 | return (0); | |
425 | } | |
426 | ||
775e241e TT |
427 | /* Save FILENAME to BACK, handling case where FILENAME is a symlink |
428 | (e.g., ~/.bash_history -> .histfiles/.bash_history.$HOSTNAME) */ | |
429 | static int | |
430 | histfile_backup (filename, back) | |
431 | const char *filename; | |
432 | const char *back; | |
433 | { | |
434 | #if defined (HAVE_READLINK) | |
435 | char linkbuf[PATH_MAX+1]; | |
436 | ssize_t n; | |
437 | ||
438 | /* Follow to target of symlink to avoid renaming symlink itself */ | |
439 | if ((n = readlink (filename, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
440 | { | |
441 | linkbuf[n] = '\0'; | |
442 | return (rename (linkbuf, back)); | |
443 | } | |
444 | #endif | |
445 | return (rename (filename, back)); | |
446 | } | |
447 | ||
448 | /* Restore ORIG from BACKUP handling case where ORIG is a symlink | |
449 | (e.g., ~/.bash_history -> .histfiles/.bash_history.$HOSTNAME) */ | |
450 | static int | |
451 | histfile_restore (backup, orig) | |
452 | const char *backup; | |
453 | const char *orig; | |
454 | { | |
455 | #if defined (HAVE_READLINK) | |
456 | char linkbuf[PATH_MAX+1]; | |
457 | ssize_t n; | |
458 | ||
459 | /* Follow to target of symlink to avoid renaming symlink itself */ | |
460 | if ((n = readlink (orig, linkbuf, sizeof (linkbuf) - 1)) > 0) | |
461 | { | |
462 | linkbuf[n] = '\0'; | |
463 | return (rename (backup, linkbuf)); | |
464 | } | |
465 | #endif | |
466 | return (rename (backup, orig)); | |
467 | } | |
468 | ||
d60d9f65 | 469 | /* Truncate the history file FNAME, leaving only LINES trailing lines. |
775e241e TT |
470 | If FNAME is NULL, then use ~/.history. Writes a new file and renames |
471 | it to the original name. Returns 0 on success, errno on failure. */ | |
d60d9f65 SS |
472 | int |
473 | history_truncate_file (fname, lines) | |
9255ee31 | 474 | const char *fname; |
c862e87b | 475 | int lines; |
d60d9f65 | 476 | { |
775e241e TT |
477 | char *buffer, *filename, *tempname, *bp, *bp1; /* bp1 == bp+1 */ |
478 | int file, chars_read, rv, orig_lines, exists, r; | |
d60d9f65 SS |
479 | struct stat finfo; |
480 | size_t file_size; | |
481 | ||
775e241e TT |
482 | history_lines_written_to_file = 0; |
483 | ||
d60d9f65 SS |
484 | buffer = (char *)NULL; |
485 | filename = history_filename (fname); | |
775e241e | 486 | tempname = 0; |
cc88a640 | 487 | file = filename ? open (filename, O_RDONLY|O_BINARY, 0666) : -1; |
775e241e | 488 | rv = exists = 0; |
d60d9f65 | 489 | |
9255ee31 | 490 | /* Don't try to truncate non-regular files. */ |
d60d9f65 | 491 | if (file == -1 || fstat (file, &finfo) == -1) |
9255ee31 EZ |
492 | { |
493 | rv = errno; | |
494 | if (file != -1) | |
495 | close (file); | |
496 | goto truncate_exit; | |
497 | } | |
775e241e | 498 | exists = 1; |
d60d9f65 | 499 | |
9255ee31 EZ |
500 | if (S_ISREG (finfo.st_mode) == 0) |
501 | { | |
502 | close (file); | |
503 | #ifdef EFTYPE | |
504 | rv = EFTYPE; | |
505 | #else | |
506 | rv = EINVAL; | |
507 | #endif | |
508 | goto truncate_exit; | |
509 | } | |
1b17e766 | 510 | |
d60d9f65 SS |
511 | file_size = (size_t)finfo.st_size; |
512 | ||
513 | /* check for overflow on very large files */ | |
514 | if (file_size != finfo.st_size || file_size + 1 < file_size) | |
515 | { | |
516 | close (file); | |
517 | #if defined (EFBIG) | |
9255ee31 EZ |
518 | rv = errno = EFBIG; |
519 | #elif defined (EOVERFLOW) | |
520 | rv = errno = EOVERFLOW; | |
521 | #else | |
522 | rv = errno = EINVAL; | |
d60d9f65 SS |
523 | #endif |
524 | goto truncate_exit; | |
525 | } | |
526 | ||
9255ee31 EZ |
527 | buffer = (char *)malloc (file_size + 1); |
528 | if (buffer == 0) | |
529 | { | |
775e241e | 530 | rv = errno; |
9255ee31 EZ |
531 | close (file); |
532 | goto truncate_exit; | |
533 | } | |
534 | ||
d60d9f65 SS |
535 | chars_read = read (file, buffer, file_size); |
536 | close (file); | |
537 | ||
538 | if (chars_read <= 0) | |
9255ee31 EZ |
539 | { |
540 | rv = (chars_read < 0) ? errno : 0; | |
541 | goto truncate_exit; | |
542 | } | |
d60d9f65 | 543 | |
775e241e | 544 | orig_lines = lines; |
d60d9f65 | 545 | /* Count backwards from the end of buffer until we have passed |
5bdf8622 DJ |
546 | LINES lines. bp1 is set funny initially. But since bp[1] can't |
547 | be a comment character (since it's off the end) and *bp can't be | |
548 | both a newline and the history comment character, it should be OK. */ | |
549 | for (bp1 = bp = buffer + chars_read - 1; lines && bp > buffer; bp--) | |
d60d9f65 | 550 | { |
5bdf8622 | 551 | if (*bp == '\n' && HIST_TIMESTAMP_START(bp1) == 0) |
d60d9f65 | 552 | lines--; |
5bdf8622 | 553 | bp1 = bp; |
d60d9f65 SS |
554 | } |
555 | ||
556 | /* If this is the first line, then the file contains exactly the | |
557 | number of lines we want to truncate to, so we don't need to do | |
558 | anything. It's the first line if we don't find a newline between | |
559 | the current value of i and 0. Otherwise, write from the start of | |
560 | this line until the end of the buffer. */ | |
9255ee31 | 561 | for ( ; bp > buffer; bp--) |
5bdf8622 DJ |
562 | { |
563 | if (*bp == '\n' && HIST_TIMESTAMP_START(bp1) == 0) | |
564 | { | |
565 | bp++; | |
566 | break; | |
567 | } | |
568 | bp1 = bp; | |
569 | } | |
d60d9f65 SS |
570 | |
571 | /* Write only if there are more lines in the file than we want to | |
572 | truncate to. */ | |
775e241e TT |
573 | if (bp <= buffer) |
574 | { | |
575 | rv = 0; | |
576 | /* No-op if LINES == 0 at this point */ | |
577 | history_lines_written_to_file = orig_lines - lines; | |
578 | goto truncate_exit; | |
579 | } | |
580 | ||
581 | tempname = history_tempfile (filename); | |
582 | ||
583 | if ((file = open (tempname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0600)) != -1) | |
d60d9f65 | 584 | { |
16bfc2f9 AH |
585 | if (write (file, bp, chars_read - (bp - buffer)) < 0) |
586 | rv = errno; | |
c862e87b | 587 | |
775e241e TT |
588 | if (close (file) < 0 && rv == 0) |
589 | rv = errno; | |
d60d9f65 | 590 | } |
775e241e TT |
591 | else |
592 | rv = errno; | |
d60d9f65 SS |
593 | |
594 | truncate_exit: | |
5836a818 | 595 | FREE (buffer); |
4a11f206 | 596 | |
775e241e TT |
597 | history_lines_written_to_file = orig_lines - lines; |
598 | ||
599 | if (rv == 0 && filename && tempname) | |
600 | rv = histfile_restore (tempname, filename); | |
601 | ||
602 | if (rv != 0) | |
603 | { | |
604 | if (tempname) | |
605 | unlink (tempname); | |
606 | history_lines_written_to_file = 0; | |
607 | } | |
608 | ||
609 | /* Make sure the new filename is owned by the same user as the old. If one | |
610 | user is running this, it's a no-op. If the shell is running after sudo | |
611 | with a shared history file, we don't want to leave the history file | |
612 | owned by root. */ | |
613 | if (rv == 0 && exists) | |
614 | r = chown (filename, finfo.st_uid, finfo.st_gid); | |
615 | ||
cc88a640 | 616 | xfree (filename); |
775e241e TT |
617 | FREE (tempname); |
618 | ||
9255ee31 | 619 | return rv; |
d60d9f65 SS |
620 | } |
621 | ||
775e241e | 622 | /* Workhorse function for writing history. Writes the last NELEMENT entries |
d60d9f65 SS |
623 | from the history list to FILENAME. OVERWRITE is non-zero if you |
624 | wish to replace FILENAME with the entries. */ | |
625 | static int | |
626 | history_do_write (filename, nelements, overwrite) | |
9255ee31 | 627 | const char *filename; |
d60d9f65 SS |
628 | int nelements, overwrite; |
629 | { | |
630 | register int i; | |
775e241e TT |
631 | char *output, *tempname, *histname; |
632 | int file, mode, rv, exists; | |
633 | struct stat finfo; | |
5bdf8622 | 634 | #ifdef HISTORY_USE_MMAP |
9255ee31 | 635 | size_t cursize; |
d60d9f65 | 636 | |
775e241e TT |
637 | history_lines_written_to_file = 0; |
638 | ||
9255ee31 EZ |
639 | mode = overwrite ? O_RDWR|O_CREAT|O_TRUNC|O_BINARY : O_RDWR|O_APPEND|O_BINARY; |
640 | #else | |
d60d9f65 | 641 | mode = overwrite ? O_WRONLY|O_CREAT|O_TRUNC|O_BINARY : O_WRONLY|O_APPEND|O_BINARY; |
9255ee31 | 642 | #endif |
775e241e TT |
643 | histname = history_filename (filename); |
644 | exists = histname ? (stat (histname, &finfo) == 0) : 0; | |
645 | ||
646 | tempname = (overwrite && exists && S_ISREG (finfo.st_mode)) ? history_tempfile (histname) : 0; | |
647 | output = tempname ? tempname : histname; | |
648 | ||
cc88a640 | 649 | file = output ? open (output, mode, 0600) : -1; |
9255ee31 | 650 | rv = 0; |
d60d9f65 | 651 | |
cc88a640 | 652 | if (file == -1) |
d60d9f65 | 653 | { |
775e241e TT |
654 | rv = errno; |
655 | FREE (histname); | |
656 | FREE (tempname); | |
657 | return (rv); | |
d60d9f65 SS |
658 | } |
659 | ||
5bdf8622 | 660 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
661 | cursize = overwrite ? 0 : lseek (file, 0, SEEK_END); |
662 | #endif | |
663 | ||
d60d9f65 SS |
664 | if (nelements > history_length) |
665 | nelements = history_length; | |
666 | ||
667 | /* Build a buffer of all the lines to write, and write them in one syscall. | |
668 | Suggested by Peter Ho (peter@robosts.oxford.ac.uk). */ | |
669 | { | |
670 | HIST_ENTRY **the_history; /* local */ | |
671 | register int j; | |
672 | int buffer_size; | |
673 | char *buffer; | |
674 | ||
675 | the_history = history_list (); | |
676 | /* Calculate the total number of bytes to write. */ | |
677 | for (buffer_size = 0, i = history_length - nelements; i < history_length; i++) | |
5bdf8622 DJ |
678 | #if 0 |
679 | buffer_size += 2 + HISTENT_BYTES (the_history[i]); | |
680 | #else | |
681 | { | |
682 | if (history_write_timestamps && the_history[i]->timestamp && the_history[i]->timestamp[0]) | |
683 | buffer_size += strlen (the_history[i]->timestamp) + 1; | |
684 | buffer_size += strlen (the_history[i]->line) + 1; | |
685 | } | |
686 | #endif | |
d60d9f65 SS |
687 | |
688 | /* Allocate the buffer, and fill it. */ | |
5bdf8622 | 689 | #ifdef HISTORY_USE_MMAP |
9255ee31 EZ |
690 | if (ftruncate (file, buffer_size+cursize) == -1) |
691 | goto mmap_error; | |
692 | buffer = (char *)mmap (0, buffer_size, PROT_READ|PROT_WRITE, MAP_WFLAGS, file, cursize); | |
693 | if ((void *)buffer == MAP_FAILED) | |
694 | { | |
695 | mmap_error: | |
696 | rv = errno; | |
9255ee31 | 697 | close (file); |
775e241e TT |
698 | if (tempname) |
699 | unlink (tempname); | |
700 | FREE (histname); | |
701 | FREE (tempname); | |
9255ee31 EZ |
702 | return rv; |
703 | } | |
704 | #else | |
705 | buffer = (char *)malloc (buffer_size); | |
706 | if (buffer == 0) | |
707 | { | |
708 | rv = errno; | |
9255ee31 | 709 | close (file); |
775e241e TT |
710 | if (tempname) |
711 | unlink (tempname); | |
712 | FREE (histname); | |
713 | FREE (tempname); | |
9255ee31 EZ |
714 | return rv; |
715 | } | |
716 | #endif | |
d60d9f65 SS |
717 | |
718 | for (j = 0, i = history_length - nelements; i < history_length; i++) | |
719 | { | |
5bdf8622 DJ |
720 | if (history_write_timestamps && the_history[i]->timestamp && the_history[i]->timestamp[0]) |
721 | { | |
722 | strcpy (buffer + j, the_history[i]->timestamp); | |
723 | j += strlen (the_history[i]->timestamp); | |
724 | buffer[j++] = '\n'; | |
725 | } | |
d60d9f65 SS |
726 | strcpy (buffer + j, the_history[i]->line); |
727 | j += strlen (the_history[i]->line); | |
728 | buffer[j++] = '\n'; | |
729 | } | |
730 | ||
5bdf8622 | 731 | #ifdef HISTORY_USE_MMAP |
775e241e | 732 | if (msync (buffer, buffer_size, MS_ASYNC) != 0 || munmap (buffer, buffer_size) != 0) |
9255ee31 EZ |
733 | rv = errno; |
734 | #else | |
735 | if (write (file, buffer, buffer_size) < 0) | |
736 | rv = errno; | |
cc88a640 | 737 | xfree (buffer); |
9255ee31 | 738 | #endif |
d60d9f65 SS |
739 | } |
740 | ||
775e241e TT |
741 | history_lines_written_to_file = nelements; |
742 | ||
743 | if (close (file) < 0 && rv == 0) | |
744 | rv = errno; | |
745 | ||
746 | if (rv == 0 && histname && tempname) | |
747 | rv = histfile_restore (tempname, histname); | |
748 | ||
749 | if (rv != 0) | |
750 | { | |
751 | if (tempname) | |
752 | unlink (tempname); | |
753 | history_lines_written_to_file = 0; | |
754 | } | |
755 | ||
756 | /* Make sure the new filename is owned by the same user as the old. If one | |
757 | user is running this, it's a no-op. If the shell is running after sudo | |
758 | with a shared history file, we don't want to leave the history file | |
759 | owned by root. */ | |
760 | if (rv == 0 && exists) | |
761 | mode = chown (histname, finfo.st_uid, finfo.st_gid); | |
d60d9f65 | 762 | |
775e241e TT |
763 | FREE (histname); |
764 | FREE (tempname); | |
d60d9f65 | 765 | |
9255ee31 | 766 | return (rv); |
d60d9f65 SS |
767 | } |
768 | ||
769 | /* Append NELEMENT entries to FILENAME. The entries appended are from | |
770 | the end of the list minus NELEMENTs up to the end of the list. */ | |
771 | int | |
772 | append_history (nelements, filename) | |
773 | int nelements; | |
9255ee31 | 774 | const char *filename; |
d60d9f65 SS |
775 | { |
776 | return (history_do_write (filename, nelements, HISTORY_APPEND)); | |
777 | } | |
778 | ||
779 | /* Overwrite FILENAME with the current history. If FILENAME is NULL, | |
780 | then write the history list to ~/.history. Values returned | |
781 | are as in read_history ().*/ | |
782 | int | |
783 | write_history (filename) | |
9255ee31 | 784 | const char *filename; |
d60d9f65 SS |
785 | { |
786 | return (history_do_write (filename, history_length, HISTORY_OVERWRITE)); | |
787 | } |