filebrowser/path.c

   1 /*
   2  * Copyright 1989 Software Research Associates, Inc., Tokyo, Japan
   3  *
   4  * Permission to use, copy, modify, and distribute this software and its
   5  * documentation for any purpose and without fee is hereby granted, provided
   6  * that the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of Software Research Associates not be used
   9  * in advertising or publicity pertaining to distribution of the software
  10  * without specific, written prior permission.  Software Research Associates
  11  * makes no representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  * SOFTWARE RESEARCH ASSOCIATES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
  15  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
  16  * IN NO EVENT SHALL SOFTWARE RESEARCH ASSOCIATES BE LIABLE FOR ANY SPECIAL,
  17  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  18  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  19  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  20  * PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  * Author: Erik M. van der Poel
  23  *         Software Research Associates, Inc., Tokyo, Japan
  24  *         erik@sra.co.jp
  25  */
  26
  27 #include <stdio.h>
  28
  29 #ifdef SEL_FILE_IGNORE_CASE
  30 #include <ctype.h>
  31 #endif /* def SEL_FILE_IGNORE_CASE */
  32
  33 #include <X11/Xos.h>
  34 #include <pwd.h>
  35 #include "selfile.h"
  36 #include "xstat.h"
  37 #include <X11/Xaw/Scrollbar.h>
  38
  39 #ifndef MAXPATHLEN
  40 #define MAXPATHLEN 1024
  41 #endif /* ndef MAXPATHLEN */
  42
  43
  44 #if defined(SVR4) || defined(SYSV) || defined(USG)
  45 extern uid_t getuid();
  46 extern void qsort();
  47 #endif /* defined(SVR4) || defined(SYSV) || defined(USG) */
  48
  49 typedef struct {
  50         char    *name;
  51         char    *dir;
  52 } SFLogin;
  53
  54 SFDir *SFdirs = NULL;
  55
  56 int SFdirEnd;
  57
  58 int SFdirPtr;
  59
  60 int SFbuttonPressed = 0;
  61
  62 static int SFdoNotTouchDirPtr = 0;
  63
  64 static int SFdoNotTouchVorigin = 0;
  65
  66 static SFDir SFrootDir, SFhomeDir;
  67
  68 static SFLogin *SFlogins;
  69
  70 static int SFtwiddle = 0;
  71
  72 int
  73 SFchdir(path)
  74         char    *path;
  75 {
  76         int     result;
  77
  78         result = 0;
  79
  80         if (strcmp(path, SFcurrentDir)) {
  81                 result = chdir(path);
  82                 if (!result) {
  83                   (void) strncpy(SFcurrentDir, path, MAXPATHLEN);
  84                 }
  85         }
  86
  87         return result;
  88 }
  89
  90 static void
  91 SFfree(i)
  92         int     i;
  93 {
  94         register SFDir  *dir;
  95         register int    j;
  96
  97         dir = &(SFdirs[i]);
  98
  99         for (j = dir->nEntries - 1; j >= 0; j--) {
 100                 if (dir->entries[j].shown != dir->entries[j].real) {
 101                         XtFree(dir->entries[j].shown);
 102                 }
 103                 XtFree(dir->entries[j].real);
 104         }
 105
 106         XtFree((char *) dir->entries);
 107
 108         XtFree(dir->dir);
 109
 110         dir->dir = NULL;
 111         return;
 112 }
 113
 114 static void
 115 SFstrdup(s1, s2)
 116         char    **s1;
 117         char    *s2;
 118 {
 119         *s1 = strcpy(XtMalloc((unsigned) (strlen(s2) + 1)), s2);
 120         return;
 121 }
 122
 123 static void
 124 SFunreadableDir(dir)
 125         SFDir   *dir;
 126 {
 127         char    *cannotOpen = "<cannot open> ";
 128
 129         dir->entries = (SFEntry *) XtMalloc(sizeof(SFEntry));
 130         dir->entries[0].statDone = 1;
 131         SFstrdup(&dir->entries[0].real, cannotOpen);
 132         dir->entries[0].shown = dir->entries[0].real;
 133         dir->nEntries = 1;
 134         dir->nChars = strlen(cannotOpen);
 135         return;
 136 }
 137
 138 #ifdef SEL_FILE_IGNORE_CASE
 139 static
 140 SFstrncmp(p, q, n)
 141         register char   *p, *q;
 142         register int    n;
 143 {
 144         register char   c1, c2;
 145         char            *psave, *qsave;
 146         int             nsave;
 147
 148         psave = p;
 149         qsave = q;
 150         nsave = n;
 151
 152         c1 = *p++;
 153         if (islower(c1)) {
 154                 c1 = toupper(c1);
 155         }
 156         c2 = *q++;
 157         if (islower(c2)) {
 158                 c2 = toupper(c2);
 159         }
 160
 161         while ((--n >= 0) && (c1 == c2)) {
 162                 if (!c1) {
 163                         return strncmp(psave, qsave, nsave);
 164                 }
 165                 c1 = *p++;
 166                 if (islower(c1)) {
 167                         c1 = toupper(c1);
 168                 }
 169                 c2 = *q++;
 170                 if (islower(c2)) {
 171                         c2 = toupper(c2);
 172                 }
 173         }
 174
 175         if (n < 0) {
 176                 return strncmp(psave, qsave, nsave);
 177         }
 178
 179         return c1 - c2;
 180 }
 181 #endif /* def SEL_FILE_IGNORE_CASE */
 182
 183 static void
 184 SFreplaceText(dir, str)
 185         SFDir   *dir;
 186         char    *str;
 187 {
 188         int     len;
 189
 190         *(dir->path) = 0;
 191         len = strlen(str);
 192         if (str[len - 1] == '/') {
 193                 (void) strcat(SFcurrentPath, str);
 194         } else {
 195                 (void) strncat(SFcurrentPath, str, len - 1);
 196         }
 197         if (strncmp(SFcurrentPath, SFstartDir, strlen(SFstartDir))) {
 198                 SFsetText(SFcurrentPath);
 199         } else {
 200                 SFsetText(&(SFcurrentPath[strlen(SFstartDir)]));
 201         }
 202
 203         SFtextChanged();
 204         return;
 205 }
 206
 207 static void
 208 SFexpand(str)
 209         char    *str;
 210 {
 211         int     len;
 212         int     cmp;
 213         char    *name, *growing;
 214         SFDir   *dir;
 215         SFEntry *entry, *max;
 216
 217         len = strlen(str);
 218
 219         dir = &(SFdirs[SFdirEnd - 1]);
 220
 221         if (dir->beginSelection == -1) {
 222                 SFstrdup(&str, str);
 223                 SFreplaceText(dir, str);
 224                 XtFree(str);
 225                 return;
 226         } else if (dir->beginSelection == dir->endSelection) {
 227                 SFreplaceText(dir, dir->entries[dir->beginSelection].shown);
 228                 return;
 229         }
 230
 231         max = &(dir->entries[dir->endSelection + 1]);
 232
 233         name = dir->entries[dir->beginSelection].shown;
 234         SFstrdup(&growing, name);
 235
 236         cmp = 0;
 237         while (!cmp) {
 238                 entry = &(dir->entries[dir->beginSelection]);
 239                 while (entry < max) {
 240                         if (cmp = strncmp(growing, entry->shown, len)) {
 241                                 break;
 242                         }
 243                         entry++;
 244                 }
 245                 len++;
 246         }
 247
 248         /*
 249          * SFreplaceText() expects filename
 250          */
 251         growing[len - 2] = ' ';
 252
 253         growing[len - 1] = 0;
 254         SFreplaceText(dir, growing);
 255         XtFree(growing);
 256 }
 257
 258 static int
 259 SFfindFile(dir, str)
 260         SFDir           *dir;
 261         register char   *str;
 262 {
 263         register int    i, last, max;
 264         register char   *name, save;
 265         SFEntry         *entries;
 266         int             len;
 267         int             begin, end;
 268         int             result;
 269
 270         len = strlen(str);
 271
 272         if (str[len - 1] == ' ') {
 273                 SFexpand(str);
 274                 return 1;
 275         } else if (str[len - 1] == '/') {
 276                 len--;
 277         }
 278
 279         max = dir->nEntries;
 280
 281         entries = dir->entries;
 282
 283         i = 0;
 284         while (i < max) {
 285                 name = entries[i].shown;
 286                 last = strlen(name) - 1;
 287                 save = name[last];
 288                 name[last] = 0;
 289
 290 #ifdef SEL_FILE_IGNORE_CASE
 291                 result = SFstrncmp(str, name, len);
 292 #else /* def SEL_FILE_IGNORE_CASE */
 293                 result = strncmp(str, name, len);
 294 #endif /* def SEL_FILE_IGNORE_CASE */
 295
 296                 name[last] = save;
 297                 if (result <= 0) {
 298                         break;
 299                 }
 300                 i++;
 301         }
 302         begin = i;
 303         while (i < max) {
 304                 name = entries[i].shown;
 305                 last = strlen(name) - 1;
 306                 save = name[last];
 307                 name[last] = 0;
 308
 309 #ifdef SEL_FILE_IGNORE_CASE
 310                 result = SFstrncmp(str, name, len);
 311 #else /* def SEL_FILE_IGNORE_CASE */
 312                 result = strncmp(str, name, len);
 313 #endif /* def SEL_FILE_IGNORE_CASE */
 314
 315                 name[last] = save;
 316                 if (result) {
 317                         break;
 318                 }
 319                 i++;
 320         }
 321         end = i;
 322
 323         if (begin != end) {
 324                 if (
 325                         (dir->beginSelection != begin) ||
 326                         (dir->endSelection != end - 1)
 327                 ) {
 328                         dir->changed = 1;
 329                         dir->beginSelection = begin;
 330                         if (str[strlen(str) - 1] == '/') {
 331                                 dir->endSelection = begin;
 332                         } else {
 333                                 dir->endSelection = end - 1;
 334                         }
 335                 }
 336         } else {
 337                 if (dir->beginSelection != -1) {
 338                         dir->changed = 1;
 339                         dir->beginSelection = -1;
 340                         dir->endSelection = -1;
 341                 }
 342         }
 343
 344         if (
 345                 SFdoNotTouchVorigin ||
 346                 ((begin > dir->vOrigin) && (end < dir->vOrigin + SFlistSize))
 347         ) {
 348                 SFdoNotTouchVorigin = 0;
 349                 return 0;
 350         }
 351
 352         i = begin - 1;
 353         if (i > max - SFlistSize) {
 354                 i = max - SFlistSize;
 355         }
 356         if (i < 0) {
 357                 i = 0;
 358         }
 359
 360         if (dir->vOrigin != i) {
 361                 dir->vOrigin = i;
 362                 dir->changed = 1;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static void
 369 SFunselect()
 370 {
 371         SFDir   *dir;
 372
 373         dir = &(SFdirs[SFdirEnd - 1]);
 374         if (dir->beginSelection != -1) {
 375                 dir->changed = 1;
 376         }
 377         dir->beginSelection = -1;
 378         dir->endSelection = -1;
 379         return;
 380 }
 381
 382 static int
 383 SFcompareLogins(p, q)
 384         SFLogin *p, *q;
 385 {
 386         return strcmp(p->name, q->name);
 387 }
 388
 389 static void
 390 SFgetHomeDirs()
 391 {
 392         struct passwd   *pw;
 393         int             alloc;
 394         int             i;
 395         SFEntry         *entries = NULL;
 396         int             len;
 397         int             maxChars;
 398
 399         {
 400                         alloc = 1;
 401                         i = 1;
 402                         entries = (SFEntry *) XtMalloc(sizeof(SFEntry));
 403                         SFlogins = (SFLogin *) XtMalloc(sizeof(SFLogin));
 404                         entries[0].real = XtMalloc(3);
 405                         (void) strcpy(entries[0].real, "~");
 406                         entries[0].shown = entries[0].real;
 407                         entries[0].statDone = 1;
 408                         SFlogins[0].name = "";
 409                         pw = getpwuid((int) getuid());
 410                         SFstrdup(&SFlogins[0].dir, pw ? pw->pw_dir : "/");
 411                         maxChars = 0;
 412         }
 413
 414         (void) setpwent();
 415
 416         while ((pw = getpwent()) && (*(pw->pw_name))) {
 417                         if (i >= alloc) {
 418                                 alloc *= 2;
 419                                 entries = (SFEntry *) XtRealloc(
 420                                         (char *) entries,
 421                                         (unsigned) (alloc * sizeof(SFEntry))
 422                                 );
 423                                 SFlogins = (SFLogin *) XtRealloc(
 424                                         (char *) SFlogins,
 425                                         (unsigned) (alloc * sizeof(SFLogin))
 426                                 );
 427                         }
 428                         len = strlen(pw->pw_name);
 429                         entries[i].real = XtMalloc((unsigned) (len + 3));
 430                         (void) strcat(strcpy(entries[i].real, "~"),
 431                                 pw->pw_name);
 432                         entries[i].shown = entries[i].real;
 433                         entries[i].statDone = 1;
 434                         if (len > maxChars) {
 435                                 maxChars = len;
 436                         }
 437                         SFstrdup(&SFlogins[i].name, pw->pw_name);
 438                         SFstrdup(&SFlogins[i].dir, pw->pw_dir);
 439                         i++;
 440         }
 441
 442         SFhomeDir.dir                   = XtMalloc(1)   ;
 443         SFhomeDir.dir[0]                = 0             ;
 444         SFhomeDir.path                  = SFcurrentPath ;
 445         SFhomeDir.entries               = entries       ;
 446         SFhomeDir.nEntries              = i             ;
 447         SFhomeDir.vOrigin               = 0             ;       /* :-) */
 448         SFhomeDir.nChars                = maxChars + 2  ;
 449         SFhomeDir.hOrigin               = 0             ;
 450         SFhomeDir.changed               = 1             ;
 451         SFhomeDir.beginSelection        = -1            ;
 452         SFhomeDir.endSelection          = -1            ;
 453
 454 #if defined(SVR4) || defined(SYSV) || defined(USG)
 455         qsort((char *) entries, (unsigned)i, sizeof(SFEntry), SFcompareEntries);
 456         qsort((char *) SFlogins, (unsigned)i, sizeof(SFLogin), SFcompareLogins);
 457 #else /* defined(SVR4) || defined(SYSV) || defined(USG) */
 458         qsort((char *) entries, i, sizeof(SFEntry), SFcompareEntries);
 459         qsort((char *) SFlogins, i, sizeof(SFLogin), SFcompareLogins);
 460 #endif /* defined(SVR4) || defined(SYSV) || defined(USG) */
 461
 462         for (i--; i >= 0; i--) {
 463                 (void) strcat(entries[i].real, "/");
 464         }
 465         return;
 466 }
 467
 468 static int
 469 SFfindHomeDir(begin, end)
 470         char    *begin, *end;
 471 {
 472         char    save;
 473         char    *theRest;
 474         int     i;
 475
 476         save = *end;
 477         *end = 0;
 478
 479         for (i = SFhomeDir.nEntries - 1; i >= 0; i--) {
 480                 if (!strcmp(SFhomeDir.entries[i].real, begin)) {
 481                         *end = save;
 482                         SFstrdup(&theRest, end);
 483                         (void) strcat(strcat(strncpy(SFcurrentPath,SFlogins[i].dir,
 484                                                      MAXPATHLEN), "/"),
 485                                       theRest);
 486                         XtFree(theRest);
 487                         SFsetText(SFcurrentPath);
 488                         SFtextChanged();
 489                         return 1;
 490                 }
 491         }
 492
 493         *end = save;
 494
 495         return 0;
 496 }
 497
 498 void
 499 SFupdatePath()
 500 {
 501         static int      alloc;
 502         static int      wasTwiddle = 0;
 503         char            *begin, *end;
 504         int             i, j;
 505         int             prevChange;
 506         int             SFdirPtrSave, SFdirEndSave;
 507         SFDir           *dir;
 508
 509         if (!SFdirs) {
 510                 SFdirs = (SFDir *) XtMalloc((alloc = 10) * sizeof(SFDir));
 511                 dir = &(SFdirs[0]);
 512                 SFstrdup(&dir->dir, "/");
 513                 (void) SFchdir("/");
 514                 (void) SFgetDir(dir);
 515                 for (j = 1; j < alloc; j++) {
 516                         SFdirs[j].dir = NULL;
 517                 }
 518                 dir->path = SFcurrentPath + 1;
 519                 dir->vOrigin = 0;
 520                 dir->hOrigin = 0;
 521                 dir->changed = 1;
 522                 dir->beginSelection = -1;
 523                 dir->endSelection = -1;
 524                 SFhomeDir.dir = NULL;
 525         }
 526
 527         SFdirEndSave = SFdirEnd;
 528         SFdirEnd = 1;
 529
 530         SFdirPtrSave = SFdirPtr;
 531         SFdirPtr = 0;
 532
 533         begin = NULL;
 534
 535         if (SFcurrentPath[0] == '~') {
 536                 if (!SFtwiddle) {
 537                         SFtwiddle = 1;
 538                         dir = &(SFdirs[0]);
 539                         SFrootDir = *dir;
 540                         if (!SFhomeDir.dir) {
 541                                 SFgetHomeDirs();
 542                         }
 543                         *dir = SFhomeDir;
 544                         dir->changed = 1;
 545                 }
 546                 end = SFcurrentPath;
 547                 SFdoNotTouchDirPtr = 1;
 548                 wasTwiddle = 1;
 549         } else {
 550                 if (SFtwiddle) {
 551                         SFtwiddle = 0;
 552                         dir = &(SFdirs[0]);
 553                         *dir = SFrootDir;
 554                         dir->changed = 1;
 555                 }
 556                 end = SFcurrentPath + 1;
 557         }
 558
 559         i = 0;
 560
 561         prevChange = 0;
 562
 563         while (*end) {
 564                 while (*end++ == '/') {
 565                         ;
 566                 }
 567                 end--;
 568                 begin = end;
 569                 while ((*end) && (*end++ != '/')) {
 570                         ;
 571                 }
 572                 if ((end - SFcurrentPath <= SFtextPos) && (*(end - 1) == '/')) {
 573                         SFdirPtr = i - 1;
 574                         if (SFdirPtr < 0) {
 575                                 SFdirPtr = 0;
 576                         }
 577                 }
 578                 if (*begin) {
 579                         if (*(end - 1) == '/') {
 580                                 char save = *end;
 581
 582                                 if (SFtwiddle) {
 583                                         if (SFfindHomeDir(begin, end)) {
 584                                                 return;
 585                                         }
 586                                 }
 587                                 *end = 0;
 588                                 i++;
 589                                 SFdirEnd++;
 590                                 if (i >= alloc) {
 591                                         SFdirs = (SFDir *) XtRealloc(
 592                                                 (char *) SFdirs,
 593                                                 (unsigned) ((alloc *= 2) *
 594                                                         sizeof(SFDir))
 595                                         );
 596                                         for (j = alloc / 2; j < alloc; j++) {
 597                                                 SFdirs[j].dir = NULL;
 598                                         }
 599                                 }
 600                                 dir = &(SFdirs[i]);
 601                                 if (
 602                                         (!(dir->dir)) ||
 603                                         prevChange ||
 604                                         strcmp(dir->dir, begin)
 605                                 ) {
 606                                         if (dir->dir) {
 607                                                 SFfree(i);
 608                                         }
 609                                         prevChange = 1;
 610                                         SFstrdup(&dir->dir, begin);
 611                                         dir->path = end;
 612                                         dir->vOrigin = 0;
 613                                         dir->hOrigin = 0;
 614                                         dir->changed = 1;
 615                                         dir->beginSelection = -1;
 616                                         dir->endSelection = -1;
 617                                         (void) SFfindFile(dir - 1, begin);
 618                                         if (
 619                                                 SFchdir(SFcurrentPath) ||
 620                                                 SFgetDir(dir)
 621                                         ) {
 622                                                 SFunreadableDir(dir);
 623                                                 break;
 624                                         }
 625                                 }
 626                                 *end = save;
 627                                 if (!save) {
 628                                         SFunselect();
 629                                 }
 630                         } else {
 631                                 if (SFfindFile(&(SFdirs[SFdirEnd-1]), begin)) {
 632                                         return;
 633                                 }
 634                         }
 635                 } else {
 636                         SFunselect();
 637                 }
 638         }
 639
 640         if ((end == SFcurrentPath + 1) && (!SFtwiddle)) {
 641                 SFunselect();
 642         }
 643
 644         for (i = SFdirEnd; i < alloc; i++) {
 645                 if (SFdirs[i].dir) {
 646                         SFfree(i);
 647                 }
 648         }
 649
 650         if (SFdoNotTouchDirPtr) {
 651                 if (wasTwiddle) {
 652                         wasTwiddle = 0;
 653                         SFdirPtr = SFdirEnd - 1;
 654                         if (SFdirPtr < 0) {
 655                                 SFdirPtr = 0;
 656                         }
 657                 } else {
 658                         SFdirPtr = SFdirPtrSave;
 659                 }
 660                 SFdoNotTouchDirPtr = 0;
 661         }
 662
 663         if ((SFdirPtr != SFdirPtrSave) || (SFdirEnd != SFdirEndSave)) {
 664                 XawScrollbarSetThumb(
 665                         selFileHScroll,
 666                         (float) (((double) SFdirPtr) / SFdirEnd),
 667                         (float) (((double) ((SFdirEnd < NR) ? SFdirEnd : NR)) /
 668                                 SFdirEnd)
 669                 );
 670         }
 671
 672         if (SFdirPtr != SFdirPtrSave) {
 673                 SFdrawLists(SF_DO_SCROLL);
 674         } else {
 675                 for (i = 0; i < NR; i++) {
 676                         if (SFdirPtr + i < SFdirEnd) {
 677                                 if (SFdirs[SFdirPtr + i].changed) {
 678                                         SFdirs[SFdirPtr + i].changed = 0;
 679                                         SFdrawList(i, SF_DO_SCROLL);
 680                                 }
 681                         } else {
 682                                 SFclearList(i, SF_DO_SCROLL);
 683                         }
 684                 }
 685         }
 686         return;
 687 }
 688
 689 void
 690 SFsetText(path)
 691         char    *path;
 692 {
 693         XawTextBlock    text;
 694
 695         text.firstPos = 0;
 696         text.length = strlen(path);
 697         text.ptr = path;
 698         text.format = FMT8BIT;
 699
 700         XawTextReplace(selFileField, 0, strlen(SFtextBuffer), &text);
 701         XawTextSetInsertionPoint(selFileField, strlen(SFtextBuffer));
 702
 703         return;
 704 }
 705
 706 /* ARGSUSED */
 707 void
 708 SFbuttonPressList(w, n, event)
 709         Widget                  w;
 710         int                     n;
 711         XButtonPressedEvent     *event;
 712 {
 713         SFbuttonPressed = 1;
 714 }
 715
 716 /* ARGSUSED */
 717 void
 718 SFbuttonReleaseList(w, n, event)
 719         Widget                  w;
 720         int                     n;
 721         XButtonReleasedEvent    *event;
 722 {
 723         SFDir   *dir;
 724
 725         SFbuttonPressed = 0;
 726
 727         if (SFcurrentInvert[n] != -1) {
 728                 if (n < 2) {
 729                         SFdoNotTouchDirPtr = 1;
 730                 }
 731                 SFdoNotTouchVorigin = 1;
 732                 dir = &(SFdirs[SFdirPtr + n]);
 733                 SFreplaceText(
 734                         dir,
 735                         dir->entries[dir->vOrigin + SFcurrentInvert[n]].shown
 736                 );
 737                 SFmotionList(w, n, event);
 738         }
 739 }
 740
 741 static int
 742 SFcheckDir(n, dir)
 743         int             n;
 744         SFDir           *dir;
 745 {
 746         struct stat     statBuf;
 747         int             i;
 748
 749         if (
 750                 (!stat(".", &statBuf)) &&
 751                 (statBuf.st_mtime != dir->mtime)
 752         ) {
 753
 754                 /*
 755                  * If the pointer is currently in the window that we are about
 756                  * to update, we must warp it to prevent the user from
 757                  * accidentally selecting the wrong file.
 758                  */
 759                 if (SFcurrentInvert[n] != -1) {
 760                         XWarpPointer(
 761                                 SFdisplay,
 762                                 None,
 763                                 XtWindow(selFileLists[n]),
 764                                 0,
 765                                 0,
 766                                 0,
 767                                 0,
 768                                 0,
 769                                 0
 770                         );
 771                 }
 772
 773                 for (i = dir->nEntries - 1; i >= 0; i--) {
 774                         if (dir->entries[i].shown != dir->entries[i].real) {
 775                                 XtFree(dir->entries[i].shown);
 776                         }
 777                         XtFree(dir->entries[i].real);
 778                 }
 779                 XtFree((char *) dir->entries);
 780                 if (SFgetDir(dir)) {
 781                         SFunreadableDir(dir);
 782                 }
 783                 if (dir->vOrigin > dir->nEntries - SFlistSize) {
 784                         dir->vOrigin = dir->nEntries - SFlistSize;
 785                 }
 786                 if (dir->vOrigin < 0) {
 787                         dir->vOrigin = 0;
 788                 }
 789                 if (dir->hOrigin > dir->nChars - SFcharsPerEntry) {
 790                         dir->hOrigin = dir->nChars - SFcharsPerEntry;
 791                 }
 792                 if (dir->hOrigin < 0) {
 793                         dir->hOrigin = 0;
 794                 }
 795                 dir->beginSelection = -1;
 796                 dir->endSelection = -1;
 797                 SFdoNotTouchVorigin = 1;
 798                 if ((dir + 1)->dir) {
 799                         (void) SFfindFile(dir, (dir + 1)->dir);
 800                 } else {
 801                         (void) SFfindFile(dir, dir->path);
 802                 }
 803
 804                 if (!SFworkProcAdded) {
 805                         (void) XtAppAddWorkProc(SFapp, SFworkProc, NULL);
 806                         SFworkProcAdded = 1;
 807                 }
 808
 809                 return 1;
 810         }
 811
 812         return 0;
 813 }
 814
 815 static int
 816 SFcheckFiles(dir)
 817         SFDir   *dir;
 818 {
 819         int             from, to;
 820         int             result;
 821         char            old, new;
 822         int             i;
 823         char            *str;
 824         int             last;
 825         struct stat     statBuf;
 826
 827         result = 0;
 828
 829         from = dir->vOrigin;
 830         to = dir->vOrigin + SFlistSize;
 831         if (to > dir->nEntries) {
 832                 to = dir->nEntries;
 833         }
 834
 835         for (i = from; i < to; i++) {
 836                 str = dir->entries[i].real;
 837                 last = strlen(str) - 1;
 838                 old = str[last];
 839                 str[last] = 0;
 840                 if (stat(str, &statBuf)) {
 841                         new = ' ';
 842                 } else {
 843                         new = SFstatChar(&statBuf);
 844                 }
 845                 str[last] = new;
 846                 if (new != old) {
 847                         result = 1;
 848                 }
 849         }
 850
 851         return result;
 852 }
 853
 854 void
 855 SFdirModTimer(cl, id)
 856         XtPointer       cl;
 857         XtIntervalId    *id;
 858 {
 859         static int      n = -1;
 860         static int      f = 0;
 861         char            save;
 862         SFDir           *dir;
 863
 864         if ((!SFtwiddle) && (SFdirPtr < SFdirEnd)) {
 865                 n++;
 866                 if ((n > NR-1) || (SFdirPtr + n >= SFdirEnd)) {
 867                         n = 0;
 868                         f++;
 869                         if ((f > NR-1) || (SFdirPtr + f >= SFdirEnd)) {
 870                                 f = 0;
 871                         }
 872                 }
 873                 dir = &(SFdirs[SFdirPtr + n]);
 874                 save = *(dir->path);
 875                 *(dir->path) = 0;
 876                 if (SFchdir(SFcurrentPath)) {
 877                         *(dir->path) = save;
 878
 879                         /*
 880                          * force a re-read
 881                          */
 882                         *(dir->dir) = 0;
 883
 884                         SFupdatePath();
 885                 } else {
 886                         *(dir->path) = save;
 887                         if (
 888                                 SFcheckDir(n, dir) ||
 889                                 ((f == n) && SFcheckFiles(dir))
 890                         ) {
 891                                 SFdrawList(n, SF_DO_SCROLL);
 892                         }
 893                 }
 894         }
 895
 896         SFdirModTimerId = XtAppAddTimeOut(SFapp, (unsigned long) 1000,
 897                 SFdirModTimer, (XtPointer) NULL);
 898 }
 899
 900 /* Return a single character describing what kind of file STATBUF is.  */
 901
 902 char
 903 SFstatChar (statBuf)
 904         struct stat *statBuf;
 905 {
 906         if (S_ISDIR (statBuf->st_mode)) {
 907                 return '/';
 908         } else if (S_ISREG (statBuf->st_mode)) {
 909           return S_ISXXX (statBuf->st_mode) ? '*' : ' ';
 910 #ifdef S_ISSOCK
 911         } else if (S_ISSOCK (statBuf->st_mode)) {
 912                 return '=';
 913 #endif /* S_ISSOCK */
 914         } else {
 915                 return ' ';
 916         }
 917 }