File: | src/bin/ksh/history.c |
Warning: | line 306, column 8 Although the value stored to 'p' is used in the enclosing expression, the value is never actually read from 'p' |
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1 | /* $OpenBSD: history.c,v 1.84 2019/10/27 15:02:19 jca Exp $ */ |
2 | |
3 | /* |
4 | * command history |
5 | */ |
6 | |
7 | /* |
8 | * This file contains |
9 | * a) the original in-memory history mechanism |
10 | * b) a more complicated mechanism done by pc@hillside.co.uk |
11 | * that more closely follows the real ksh way of doing |
12 | * things. |
13 | */ |
14 | |
15 | #include <sys/stat.h> |
16 | |
17 | #include <errno(*__errno()).h> |
18 | #include <fcntl.h> |
19 | #include <stdlib.h> |
20 | #include <stdio.h> |
21 | #include <string.h> |
22 | #include <unistd.h> |
23 | #include <vis.h> |
24 | |
25 | #include "sh.h" |
26 | |
27 | static void history_write(void); |
28 | static FILE *history_open(void); |
29 | static void history_load(Source *); |
30 | static void history_close(void); |
31 | |
32 | static int hist_execute(char *); |
33 | static int hist_replace(char **, const char *, const char *, int); |
34 | static char **hist_get(const char *, int, int); |
35 | static char **hist_get_oldest(void); |
36 | static void histbackup(void); |
37 | |
38 | static FILE *histfh; |
39 | static char **histbase; /* actual start of the history[] allocation */ |
40 | static char **current; /* current position in history[] */ |
41 | static char *hname; /* current name of history file */ |
42 | static int hstarted; /* set after hist_init() called */ |
43 | static int ignoredups; /* ditch duplicated history lines? */ |
44 | static int ignorespace; /* ditch lines starting with a space? */ |
45 | static Source *hist_source; |
46 | static uint32_t line_co; |
47 | |
48 | static struct stat last_sb; |
49 | |
50 | static volatile sig_atomic_t c_fc_depth; |
51 | |
52 | int |
53 | c_fc(char **wp) |
54 | { |
55 | struct shf *shf; |
56 | struct temp *tf = NULL((void *)0); |
57 | char *p, *editor = NULL((void *)0); |
58 | int gflag = 0, lflag = 0, nflag = 0, sflag = 0, rflag = 0; |
59 | int optc, ret; |
60 | char *first = NULL((void *)0), *last = NULL((void *)0); |
61 | char **hfirst, **hlast, **hp; |
62 | |
63 | if (c_fc_depth != 0) { |
64 | bi_errorf("history function called recursively"); |
65 | return 1; |
66 | } |
67 | |
68 | if (!Flag(FTALKING_I)(shell_flags[(int) (FTALKING_I)])) { |
69 | bi_errorf("history functions not available"); |
70 | return 1; |
71 | } |
72 | |
73 | while ((optc = ksh_getopt(wp, &builtin_opt, |
74 | "e:glnrs0,1,2,3,4,5,6,7,8,9,")) != -1) |
75 | switch (optc) { |
76 | case 'e': |
77 | p = builtin_opt.optarg; |
78 | if (strcmp(p, "-") == 0) |
79 | sflag++; |
80 | else { |
81 | size_t len = strlen(p) + 4; |
82 | editor = str_nsave(p, len, ATEMP&genv->area); |
83 | strlcat(editor, " $_", len); |
84 | } |
85 | break; |
86 | case 'g': /* non-at&t ksh */ |
87 | gflag++; |
88 | break; |
89 | case 'l': |
90 | lflag++; |
91 | break; |
92 | case 'n': |
93 | nflag++; |
94 | break; |
95 | case 'r': |
96 | rflag++; |
97 | break; |
98 | case 's': /* posix version of -e - */ |
99 | sflag++; |
100 | break; |
101 | /* kludge city - accept -num as -- -num (kind of) */ |
102 | case '0': case '1': case '2': case '3': case '4': |
103 | case '5': case '6': case '7': case '8': case '9': |
104 | p = shf_smprintf("-%c%s", |
105 | optc, builtin_opt.optarg); |
106 | if (!first) |
107 | first = p; |
108 | else if (!last) |
109 | last = p; |
110 | else { |
111 | bi_errorf("too many arguments"); |
112 | return 1; |
113 | } |
114 | break; |
115 | case '?': |
116 | return 1; |
117 | } |
118 | wp += builtin_opt.optind; |
119 | |
120 | /* Substitute and execute command */ |
121 | if (sflag) { |
122 | char *pat = NULL((void *)0), *rep = NULL((void *)0); |
123 | |
124 | if (editor || lflag || nflag || rflag) { |
125 | bi_errorf("can't use -e, -l, -n, -r with -s (-e -)"); |
126 | return 1; |
127 | } |
128 | |
129 | /* Check for pattern replacement argument */ |
130 | if (*wp && **wp && (p = strchr(*wp + 1, '='))) { |
131 | pat = str_save(*wp, ATEMP&genv->area); |
132 | p = pat + (p - *wp); |
133 | *p++ = '\0'; |
134 | rep = p; |
135 | wp++; |
136 | } |
137 | /* Check for search prefix */ |
138 | if (!first && (first = *wp)) |
139 | wp++; |
140 | if (last || *wp) { |
141 | bi_errorf("too many arguments"); |
142 | return 1; |
143 | } |
144 | |
145 | hp = first ? hist_get(first, false0, false0) : |
146 | hist_get_newest(false0); |
147 | if (!hp) |
148 | return 1; |
149 | c_fc_depth++; |
150 | ret = hist_replace(hp, pat, rep, gflag); |
151 | c_fc_reset(); |
152 | return ret; |
153 | } |
154 | |
155 | if (editor && (lflag || nflag)) { |
156 | bi_errorf("can't use -l, -n with -e"); |
157 | return 1; |
158 | } |
159 | |
160 | if (!first && (first = *wp)) |
161 | wp++; |
162 | if (!last && (last = *wp)) |
163 | wp++; |
164 | if (*wp) { |
165 | bi_errorf("too many arguments"); |
166 | return 1; |
167 | } |
168 | if (!first) { |
169 | hfirst = lflag ? hist_get("-16", true1, true1) : |
170 | hist_get_newest(false0); |
171 | if (!hfirst) |
172 | return 1; |
173 | /* can't fail if hfirst didn't fail */ |
174 | hlast = hist_get_newest(false0); |
175 | } else { |
176 | /* POSIX says not an error if first/last out of bounds |
177 | * when range is specified; at&t ksh and pdksh allow out of |
178 | * bounds for -l as well. |
179 | */ |
180 | hfirst = hist_get(first, (lflag || last) ? true1 : false0, |
181 | lflag ? true1 : false0); |
182 | if (!hfirst) |
183 | return 1; |
184 | hlast = last ? hist_get(last, true1, lflag ? true1 : false0) : |
185 | (lflag ? hist_get_newest(false0) : hfirst); |
186 | if (!hlast) |
187 | return 1; |
188 | } |
189 | if (hfirst > hlast) { |
190 | char **temp; |
191 | |
192 | temp = hfirst; hfirst = hlast; hlast = temp; |
193 | rflag = !rflag; /* POSIX */ |
194 | } |
195 | |
196 | /* List history */ |
197 | if (lflag) { |
198 | char *s, *t; |
199 | const char *nfmt = nflag ? "\t" : "%d\t"; |
200 | |
201 | for (hp = rflag ? hlast : hfirst; |
202 | hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1) { |
203 | shf_fprintf(shl_stdout(&shf_iob[1]), nfmt, |
204 | hist_source->line - (int) (histptr - hp)); |
205 | /* print multi-line commands correctly */ |
206 | for (s = *hp; (t = strchr(s, '\n')); s = t) |
207 | shf_fprintf(shl_stdout(&shf_iob[1]), "%.*s\t", ++t - s, s); |
208 | shf_fprintf(shl_stdout(&shf_iob[1]), "%s\n", s); |
209 | } |
210 | shf_flush(shl_stdout(&shf_iob[1])); |
211 | return 0; |
212 | } |
213 | |
214 | /* Run editor on selected lines, then run resulting commands */ |
215 | |
216 | tf = maketemp(ATEMP&genv->area, TT_HIST_EDIT, &genv->temps); |
217 | if (!(shf = tf->shf)) { |
218 | bi_errorf("cannot create temp file %s - %s", |
219 | tf->name, strerror(errno(*__errno()))); |
220 | return 1; |
221 | } |
222 | for (hp = rflag ? hlast : hfirst; |
223 | hp >= hfirst && hp <= hlast; hp += rflag ? -1 : 1) |
224 | shf_fprintf(shf, "%s\n", *hp); |
225 | if (shf_close(shf) == EOF(-1)) { |
226 | bi_errorf("error writing temporary file - %s", strerror(errno(*__errno()))); |
227 | return 1; |
228 | } |
229 | |
230 | /* Ignore setstr errors here (arbitrary) */ |
231 | setstr(local("_", false0), tf->name, KSH_RETURN_ERROR0x1); |
232 | |
233 | /* XXX: source should not get trashed by this.. */ |
234 | { |
235 | Source *sold = source; |
236 | |
237 | ret = command(editor ? editor : "${FCEDIT:-/bin/ed} $_", 0); |
238 | source = sold; |
239 | if (ret) |
240 | return ret; |
241 | } |
242 | |
243 | { |
244 | struct stat statb; |
245 | XString xs; |
246 | char *xp; |
247 | int n; |
248 | |
249 | if (!(shf = shf_open(tf->name, O_RDONLY0x0000, 0, 0))) { |
250 | bi_errorf("cannot open temp file %s", tf->name); |
251 | return 1; |
252 | } |
253 | |
254 | n = fstat(shf->fd, &statb) == -1 ? 128 : |
255 | statb.st_size + 1; |
256 | Xinit(xs, xp, n, hist_source->areap)do { (xs).len = n; (xs).areap = (hist_source->areap); (xs) .beg = alloc((xs).len + 8, (xs).areap); (xs).end = (xs).beg + (xs).len; xp = (xs).beg; } while (0); |
257 | while ((n = shf_read(xp, Xnleft(xs, xp)((xs).end - (xp)), shf)) > 0) { |
258 | xp += n; |
259 | if (Xnleft(xs, xp)((xs).end - (xp)) <= 0) |
260 | XcheckN(xs, xp, Xlength(xs, xp))do { ptrdiff_t more = ((xp) + (((xp) - (xs).beg))) - (xs).end ; if (more > 0) xp = Xcheck_grow_(&xs, xp, more); } while (0); |
261 | } |
262 | if (n < 0) { |
263 | bi_errorf("error reading temp file %s - %s", |
264 | tf->name, strerror(shf->errno_)); |
265 | shf_close(shf); |
266 | return 1; |
267 | } |
268 | shf_close(shf); |
269 | *xp = '\0'; |
270 | strip_nuls(Xstring(xs, xp)((xs).beg), Xlength(xs, xp)((xp) - (xs).beg)); |
271 | c_fc_depth++; |
272 | ret = hist_execute(Xstring(xs, xp)((xs).beg)); |
273 | c_fc_reset(); |
274 | return ret; |
275 | } |
276 | } |
277 | |
278 | /* Reset the c_fc depth counter. |
279 | * Made available for when an fc call is interrupted. |
280 | */ |
281 | void |
282 | c_fc_reset(void) |
283 | { |
284 | c_fc_depth = 0; |
285 | } |
286 | |
287 | /* Save cmd in history, execute cmd (cmd gets trashed) */ |
288 | static int |
289 | hist_execute(char *cmd) |
290 | { |
291 | Source *sold; |
292 | int ret; |
293 | char *p, *q; |
294 | |
295 | histbackup(); |
296 | |
297 | for (p = cmd; p; p = q) { |
298 | if ((q = strchr(p, '\n'))) { |
299 | *q++ = '\0'; /* kill the newline */ |
300 | if (!*q) /* ignore trailing newline */ |
301 | q = NULL((void *)0); |
302 | } |
303 | histsave(++(hist_source->line), p, 1); |
304 | |
305 | shellf("%s\n", p); /* POSIX doesn't say this is done... */ |
306 | if ((p = q)) /* restore \n (trailing \n not restored) */ |
Although the value stored to 'p' is used in the enclosing expression, the value is never actually read from 'p' | |
307 | q[-1] = '\n'; |
308 | } |
309 | |
310 | /* Commands are executed here instead of pushing them onto the |
311 | * input 'cause posix says the redirection and variable assignments |
312 | * in |
313 | * X=y fc -e - 42 2> /dev/null |
314 | * are to effect the repeated commands environment. |
315 | */ |
316 | /* XXX: source should not get trashed by this.. */ |
317 | sold = source; |
318 | ret = command(cmd, 0); |
319 | source = sold; |
320 | return ret; |
321 | } |
322 | |
323 | static int |
324 | hist_replace(char **hp, const char *pat, const char *rep, int global) |
325 | { |
326 | char *line; |
327 | |
328 | if (!pat) |
329 | line = str_save(*hp, ATEMP&genv->area); |
330 | else { |
331 | char *s, *s1; |
332 | int pat_len = strlen(pat); |
333 | int rep_len = strlen(rep); |
334 | int len; |
335 | XString xs; |
336 | char *xp; |
337 | int any_subst = 0; |
338 | |
339 | Xinit(xs, xp, 128, ATEMP)do { (xs).len = 128; (xs).areap = (&genv->area); (xs). beg = alloc((xs).len + 8, (xs).areap); (xs).end = (xs).beg + ( xs).len; xp = (xs).beg; } while (0); |
340 | for (s = *hp; (s1 = strstr(s, pat)) && (!any_subst || global); |
341 | s = s1 + pat_len) { |
342 | any_subst = 1; |
343 | len = s1 - s; |
344 | XcheckN(xs, xp, len + rep_len)do { ptrdiff_t more = ((xp) + (len + rep_len)) - (xs).end; if (more > 0) xp = Xcheck_grow_(&xs, xp, more); } while ( 0); |
345 | memcpy(xp, s, len); /* first part */ |
346 | xp += len; |
347 | memcpy(xp, rep, rep_len); /* replacement */ |
348 | xp += rep_len; |
349 | } |
350 | if (!any_subst) { |
351 | bi_errorf("substitution failed"); |
352 | return 1; |
353 | } |
354 | len = strlen(s) + 1; |
355 | XcheckN(xs, xp, len)do { ptrdiff_t more = ((xp) + (len)) - (xs).end; if (more > 0) xp = Xcheck_grow_(&xs, xp, more); } while (0); |
356 | memcpy(xp, s, len); |
357 | xp += len; |
358 | line = Xclose(xs, xp)aresize((xs).beg, ((xp) - (xs).beg), (xs).areap); |
359 | } |
360 | return hist_execute(line); |
361 | } |
362 | |
363 | /* |
364 | * get pointer to history given pattern |
365 | * pattern is a number or string |
366 | */ |
367 | static char ** |
368 | hist_get(const char *str, int approx, int allow_cur) |
369 | { |
370 | char **hp = NULL((void *)0); |
371 | int n; |
372 | |
373 | if (getn(str, &n)) { |
374 | hp = histptr + (n < 0 ? n : (n - hist_source->line)); |
375 | if ((long)hp < (long)history) { |
376 | if (approx) |
377 | hp = hist_get_oldest(); |
378 | else { |
379 | bi_errorf("%s: not in history", str); |
380 | hp = NULL((void *)0); |
381 | } |
382 | } else if (hp > histptr) { |
383 | if (approx) |
384 | hp = hist_get_newest(allow_cur); |
385 | else { |
386 | bi_errorf("%s: not in history", str); |
387 | hp = NULL((void *)0); |
388 | } |
389 | } else if (!allow_cur && hp == histptr) { |
390 | bi_errorf("%s: invalid range", str); |
391 | hp = NULL((void *)0); |
392 | } |
393 | } else { |
394 | int anchored = *str == '?' ? (++str, 0) : 1; |
395 | |
396 | /* the -1 is to avoid the current fc command */ |
397 | n = findhist(histptr - history - 1, 0, str, anchored); |
398 | if (n < 0) { |
399 | bi_errorf("%s: not in history", str); |
400 | hp = NULL((void *)0); |
401 | } else |
402 | hp = &history[n]; |
403 | } |
404 | return hp; |
405 | } |
406 | |
407 | /* Return a pointer to the newest command in the history */ |
408 | char ** |
409 | hist_get_newest(int allow_cur) |
410 | { |
411 | if (histptr < history || (!allow_cur && histptr == history)) { |
412 | bi_errorf("no history (yet)"); |
413 | return NULL((void *)0); |
414 | } |
415 | if (allow_cur) |
416 | return histptr; |
417 | return histptr - 1; |
418 | } |
419 | |
420 | /* Return a pointer to the oldest command in the history */ |
421 | static char ** |
422 | hist_get_oldest(void) |
423 | { |
424 | if (histptr <= history) { |
425 | bi_errorf("no history (yet)"); |
426 | return NULL((void *)0); |
427 | } |
428 | return history; |
429 | } |
430 | |
431 | /******************************/ |
432 | /* Back up over last histsave */ |
433 | /******************************/ |
434 | static void |
435 | histbackup(void) |
436 | { |
437 | static int last_line = -1; |
438 | |
439 | if (histptr >= history && last_line != hist_source->line) { |
440 | hist_source->line--; |
441 | afree(*histptr, APERM&aperm); |
442 | histptr--; |
443 | last_line = hist_source->line; |
444 | } |
445 | } |
446 | |
447 | static void |
448 | histreset(void) |
449 | { |
450 | char **hp; |
451 | |
452 | for (hp = history; hp <= histptr; hp++) |
453 | afree(*hp, APERM&aperm); |
454 | |
455 | histptr = history - 1; |
456 | hist_source->line = 0; |
457 | } |
458 | |
459 | /* |
460 | * Return the current position. |
461 | */ |
462 | char ** |
463 | histpos(void) |
464 | { |
465 | return current; |
466 | } |
467 | |
468 | int |
469 | histnum(int n) |
470 | { |
471 | int last = histptr - history; |
472 | |
473 | if (n < 0 || n >= last) { |
474 | current = histptr; |
475 | return last; |
476 | } else { |
477 | current = &history[n]; |
478 | return n; |
479 | } |
480 | } |
481 | |
482 | /* |
483 | * This will become unnecessary if hist_get is modified to allow |
484 | * searching from positions other than the end, and in either |
485 | * direction. |
486 | */ |
487 | int |
488 | findhist(int start, int fwd, const char *str, int anchored) |
489 | { |
490 | char **hp; |
491 | int maxhist = histptr - history; |
492 | int incr = fwd ? 1 : -1; |
493 | int len = strlen(str); |
494 | |
495 | if (start < 0 || start >= maxhist) |
496 | start = maxhist; |
497 | |
498 | hp = &history[start]; |
499 | for (; hp >= history && hp <= histptr; hp += incr) |
500 | if ((anchored && strncmp(*hp, str, len) == 0) || |
501 | (!anchored && strstr(*hp, str))) |
502 | return hp - history; |
503 | |
504 | return -1; |
505 | } |
506 | |
507 | int |
508 | findhistrel(const char *str) |
509 | { |
510 | int maxhist = histptr - history; |
511 | int start = maxhist - 1; |
512 | int rec = atoi(str); |
513 | |
514 | if (rec == 0) |
515 | return -1; |
516 | if (rec > 0) { |
517 | if (rec > maxhist) |
518 | return -1; |
519 | return rec - 1; |
520 | } |
521 | if (rec > maxhist) |
522 | return -1; |
523 | return start + rec + 1; |
524 | } |
525 | |
526 | void |
527 | sethistcontrol(const char *str) |
528 | { |
529 | char *spec, *tok, *state; |
530 | |
531 | ignorespace = 0; |
532 | ignoredups = 0; |
533 | |
534 | if (str == NULL((void *)0)) |
535 | return; |
536 | |
537 | spec = str_save(str, ATEMP&genv->area); |
538 | for (tok = strtok_r(spec, ":", &state); tok != NULL((void *)0); |
539 | tok = strtok_r(NULL((void *)0), ":", &state)) { |
540 | if (strcmp(tok, "ignoredups") == 0) |
541 | ignoredups = 1; |
542 | else if (strcmp(tok, "ignorespace") == 0) |
543 | ignorespace = 1; |
544 | } |
545 | afree(spec, ATEMP&genv->area); |
546 | } |
547 | |
548 | /* |
549 | * set history |
550 | * this means reallocating the dataspace |
551 | */ |
552 | void |
553 | sethistsize(int n) |
554 | { |
555 | if (n > 0 && (uint32_t)n != histsize) { |
556 | char **tmp; |
557 | int offset = histptr - history; |
558 | |
559 | /* save most recent history */ |
560 | if (offset > n - 1) { |
561 | char **hp; |
562 | |
563 | offset = n - 1; |
564 | for (hp = history; hp < histptr - offset; hp++) |
565 | afree(*hp, APERM&aperm); |
566 | memmove(history, histptr - offset, n * sizeof(char *)); |
567 | } |
568 | |
569 | tmp = reallocarray(histbase, n + 1, sizeof(char *)); |
570 | if (tmp != NULL((void *)0)) { |
571 | histbase = tmp; |
572 | histsize = n; |
573 | history = histbase + 1; |
574 | histptr = history + offset; |
575 | } else |
576 | warningf(false0, "resizing history storage: %s", |
577 | strerror(errno(*__errno()))); |
578 | } |
579 | } |
580 | |
581 | /* |
582 | * set history file |
583 | * This can mean reloading/resetting/starting history file |
584 | * maintenance |
585 | */ |
586 | void |
587 | sethistfile(const char *name) |
588 | { |
589 | /* if not started then nothing to do */ |
590 | if (hstarted == 0) |
591 | return; |
592 | |
593 | /* if the name is the same as the name we have */ |
594 | if (hname && strcmp(hname, name) == 0) |
595 | return; |
596 | /* |
597 | * its a new name - possibly |
598 | */ |
599 | if (hname) { |
600 | afree(hname, APERM&aperm); |
601 | hname = NULL((void *)0); |
602 | histreset(); |
603 | } |
604 | |
605 | history_close(); |
606 | hist_init(hist_source); |
607 | } |
608 | |
609 | /* |
610 | * initialise the history vector |
611 | */ |
612 | void |
613 | init_histvec(void) |
614 | { |
615 | if (histbase == NULL((void *)0)) { |
616 | histsize = HISTORYSIZE500; |
617 | /* |
618 | * allocate one extra element so that histptr always |
619 | * lies within array bounds |
620 | */ |
621 | histbase = reallocarray(NULL((void *)0), histsize + 1, sizeof(char *)); |
622 | if (histbase == NULL((void *)0)) |
623 | internal_errorf("allocating history storage: %s", |
624 | strerror(errno(*__errno()))); |
625 | *histbase = NULL((void *)0); |
626 | history = histbase + 1; |
627 | histptr = history - 1; |
628 | } |
629 | } |
630 | |
631 | static void |
632 | history_lock(int operation) |
633 | { |
634 | while (flock(fileno(histfh)(!__isthreaded ? ((histfh)->_file) : (fileno)(histfh)), operation) != 0) { |
635 | if (errno(*__errno()) == EINTR4 || errno(*__errno()) == EAGAIN35) |
636 | continue; |
637 | else |
638 | break; |
639 | } |
640 | } |
641 | |
642 | /* |
643 | * Routines added by Peter Collinson BSDI(Europe)/Hillside Systems to |
644 | * a) permit HISTSIZE to control number of lines of history stored |
645 | * b) maintain a physical history file |
646 | * |
647 | * It turns out that there is a lot of ghastly hackery here |
648 | */ |
649 | |
650 | |
651 | /* |
652 | * save command in history |
653 | */ |
654 | void |
655 | histsave(int lno, const char *cmd, int dowrite) |
656 | { |
657 | char *c, *cp; |
658 | |
659 | if (ignorespace && cmd[0] == ' ') |
660 | return; |
661 | |
662 | c = str_save(cmd, APERM&aperm); |
663 | if ((cp = strrchr(c, '\n')) != NULL((void *)0)) |
664 | *cp = '\0'; |
665 | |
666 | /* |
667 | * XXX to properly check for duplicated lines we should first reload |
668 | * the histfile if needed |
669 | */ |
670 | if (ignoredups && histptr >= history && strcmp(*histptr, c) == 0) { |
671 | afree(c, APERM&aperm); |
672 | return; |
673 | } |
674 | |
675 | if (dowrite && histfh) { |
676 | #ifndef SMALL |
677 | struct stat sb; |
678 | |
679 | history_lock(LOCK_EX0x02); |
680 | if (fstat(fileno(histfh)(!__isthreaded ? ((histfh)->_file) : (fileno)(histfh)), &sb) != -1) { |
681 | if (timespeccmp(&sb.st_mtim, &last_sb.st_mtim, ==)(((&sb.st_mtim)->tv_sec == (&last_sb.st_mtim)-> tv_sec) ? ((&sb.st_mtim)->tv_nsec == (&last_sb.st_mtim )->tv_nsec) : ((&sb.st_mtim)->tv_sec == (&last_sb .st_mtim)->tv_sec))) |
682 | ; /* file is unchanged */ |
683 | else { |
684 | histreset(); |
685 | history_load(hist_source); |
686 | } |
687 | } |
688 | #endif |
689 | } |
690 | |
691 | if (histptr < history + histsize - 1) |
692 | histptr++; |
693 | else { /* remove oldest command */ |
694 | afree(*history, APERM&aperm); |
695 | memmove(history, history + 1, |
696 | (histsize - 1) * sizeof(*history)); |
697 | } |
698 | *histptr = c; |
699 | |
700 | if (dowrite && histfh) { |
701 | #ifndef SMALL |
702 | char *encoded; |
703 | |
704 | /* append to file */ |
705 | if (fseeko(histfh, 0, SEEK_END2) == 0 && |
706 | stravis(&encoded, c, VIS_SAFE0x20 | VIS_NL0x10) != -1) { |
707 | fprintf(histfh, "%s\n", encoded); |
708 | fflush(histfh); |
709 | fstat(fileno(histfh)(!__isthreaded ? ((histfh)->_file) : (fileno)(histfh)), &last_sb); |
710 | line_co++; |
711 | history_write(); |
712 | free(encoded); |
713 | } |
714 | history_lock(LOCK_UN0x08); |
715 | #endif |
716 | } |
717 | } |
718 | |
719 | static FILE * |
720 | history_open(void) |
721 | { |
722 | FILE *f = NULL((void *)0); |
723 | #ifndef SMALL |
724 | struct stat sb; |
725 | int fd, fddup; |
726 | |
727 | if ((fd = open(hname, O_RDWR0x0002 | O_CREAT0x0200 | O_EXLOCK0x0020, 0600)) == -1) |
728 | return NULL((void *)0); |
729 | if (fstat(fd, &sb) == -1 || sb.st_uid != getuid()) { |
730 | close(fd); |
731 | return NULL((void *)0); |
732 | } |
733 | fddup = savefd(fd); |
734 | if (fddup != fd) |
735 | close(fd); |
736 | |
737 | if ((f = fdopen(fddup, "r+")) == NULL((void *)0)) |
738 | close(fddup); |
739 | else |
740 | last_sb = sb; |
741 | #endif |
742 | return f; |
743 | } |
744 | |
745 | static void |
746 | history_close(void) |
747 | { |
748 | if (histfh) { |
749 | fflush(histfh); |
750 | fclose(histfh); |
751 | histfh = NULL((void *)0); |
752 | } |
753 | } |
754 | |
755 | static void |
756 | history_load(Source *s) |
757 | { |
758 | char *p, encoded[LINE4096 + 1], line[LINE4096 + 1]; |
759 | int toolongseen = 0; |
760 | |
761 | rewind(histfh); |
762 | line_co = 1; |
763 | |
764 | /* just read it all; will auto resize history upon next command */ |
765 | while (fgets(encoded, sizeof(encoded), histfh)) { |
766 | if ((p = strchr(encoded, '\n')) == NULL((void *)0)) { |
767 | /* discard overlong line */ |
768 | do { |
769 | /* maybe a missing trailing newline? */ |
770 | if (strlen(encoded) != sizeof(encoded) - 1) { |
771 | bi_errorf("history file is corrupt"); |
772 | return; |
773 | } |
774 | } while (fgets(encoded, sizeof(encoded), histfh) |
775 | && strchr(encoded, '\n') == NULL((void *)0)); |
776 | |
777 | if (!toolongseen) { |
778 | toolongseen = 1; |
779 | bi_errorf("ignored history line(s) longer than" |
780 | " %d bytes", LINE4096); |
781 | } |
782 | |
783 | continue; |
784 | } |
785 | *p = '\0'; |
786 | s->line = line_co; |
787 | s->cmd_offset = line_co; |
788 | strunvis(line, encoded); |
789 | histsave(line_co, line, 0); |
790 | line_co++; |
791 | } |
792 | |
793 | history_write(); |
794 | } |
795 | |
796 | #define HMAGIC10xab 0xab |
797 | #define HMAGIC20xcd 0xcd |
798 | |
799 | void |
800 | hist_init(Source *s) |
801 | { |
802 | int oldmagic1, oldmagic2; |
803 | |
804 | if (Flag(FTALKING)(shell_flags[(int) (FTALKING)]) == 0) |
805 | return; |
806 | |
807 | hstarted = 1; |
808 | |
809 | hist_source = s; |
810 | |
811 | if (str_val(global("HISTFILE")) == null) |
812 | return; |
813 | hname = str_save(str_val(global("HISTFILE")), APERM&aperm); |
814 | histfh = history_open(); |
815 | if (histfh == NULL((void *)0)) |
816 | return; |
817 | |
818 | oldmagic1 = fgetc(histfh); |
819 | oldmagic2 = fgetc(histfh); |
820 | |
821 | if (oldmagic1 == EOF(-1) || oldmagic2 == EOF(-1)) { |
822 | if (!feof(histfh)(!__isthreaded ? (((histfh)->_flags & 0x0020) != 0) : ( feof)(histfh)) && ferror(histfh)(!__isthreaded ? (((histfh)->_flags & 0x0040) != 0) : ( ferror)(histfh))) { |
823 | history_close(); |
824 | return; |
825 | } |
826 | } else if (oldmagic1 == HMAGIC10xab && oldmagic2 == HMAGIC20xcd) { |
827 | bi_errorf("ignoring old style history file"); |
828 | history_close(); |
829 | return; |
830 | } |
831 | |
832 | history_load(s); |
833 | |
834 | history_lock(LOCK_UN0x08); |
835 | } |
836 | |
837 | static void |
838 | history_write(void) |
839 | { |
840 | char **hp, *encoded; |
841 | |
842 | /* see if file has grown over 25% */ |
843 | if (line_co < histsize + (histsize / 4)) |
844 | return; |
845 | |
846 | /* rewrite the whole caboodle */ |
847 | rewind(histfh); |
848 | if (ftruncate(fileno(histfh)(!__isthreaded ? ((histfh)->_file) : (fileno)(histfh)), 0) == -1) { |
849 | bi_errorf("failed to rewrite history file - %s", |
850 | strerror(errno(*__errno()))); |
851 | } |
852 | for (hp = history; hp <= histptr; hp++) { |
853 | if (stravis(&encoded, *hp, VIS_SAFE0x20 | VIS_NL0x10) != -1) { |
854 | if (fprintf(histfh, "%s\n", encoded) == -1) { |
855 | free(encoded); |
856 | return; |
857 | } |
858 | free(encoded); |
859 | } |
860 | } |
861 | |
862 | line_co = histsize; |
863 | |
864 | fflush(histfh); |
865 | fstat(fileno(histfh)(!__isthreaded ? ((histfh)->_file) : (fileno)(histfh)), &last_sb); |
866 | } |
867 | |
868 | void |
869 | hist_finish(void) |
870 | { |
871 | history_close(); |
872 | } |