| 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 | } |