window.c

   1 /* $Id: window.c,v 1.126 2010-02-08 18:10:07 tcunha Exp $ */
   2
   3 /*
   4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
  15  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
  16  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <sys/types.h>
  20 #include <sys/ioctl.h>
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <fnmatch.h>
  25 #include <pwd.h>
  26 #include <signal.h>
  27 #include <stdint.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <termios.h>
  31 #include <unistd.h>
  32
  33 #include "tmux.h"
  34
  35 /*
  36  * Each window is attached to a number of panes, each of which is a pty. This
  37  * file contains code to handle them.
  38  *
  39  * A pane has two buffers attached, these are filled and emptied by the main
  40  * server poll loop. Output data is received from pty's in screen format,
  41  * translated and returned as a series of escape sequences and strings via
  42  * input_parse (in input.c). Input data is received as key codes and written
  43  * directly via input_key.
  44  *
  45  * Each pane also has a "virtual" screen (screen.c) which contains the current
  46  * state and is redisplayed when the window is reattached to a client.
  47  *
  48  * Windows are stored directly on a global array and wrapped in any number of
  49  * winlink structs to be linked onto local session RB trees. A reference count
  50  * is maintained and a window removed from the global list and destroyed when
  51  * it reaches zero.
  52  */
  53
  54 /* Global window list. */
  55 struct windows windows;
  56
  57 void    window_pane_read_callback(struct bufferevent *, void *);
  58 void    window_pane_error_callback(struct bufferevent *, short, void *);
  59
  60 RB_GENERATE(winlinks, winlink, entry, winlink_cmp);
  61
  62 int
  63 winlink_cmp(struct winlink *wl1, struct winlink *wl2)
  64 {
  65         return (wl1->idx - wl2->idx);
  66 }
  67
  68 struct winlink *
  69 winlink_find_by_window(struct winlinks *wwl, struct window *w)
  70 {
  71         struct winlink  *wl;
  72
  73         RB_FOREACH(wl, winlinks, wwl) {
  74                 if (wl->window == w)
  75                         return (wl);
  76         }
  77
  78         return (NULL);
  79 }
  80
  81 struct winlink *
  82 winlink_find_by_index(struct winlinks *wwl, int idx)
  83 {
  84         struct winlink  wl;
  85
  86         if (idx < 0)
  87                 fatalx("bad index");
  88
  89         wl.idx = idx;
  90         return (RB_FIND(winlinks, wwl, &wl));
  91 }
  92
  93 int
  94 winlink_next_index(struct winlinks *wwl, int idx)
  95 {
  96         int     i;
  97
  98         i = idx;
  99         do {
 100                 if (winlink_find_by_index(wwl, i) == NULL)
 101                         return (i);
 102                 if (i == INT_MAX)
 103                         i = 0;
 104                 else
 105                         i++;
 106         } while (i != idx);
 107         return (-1);
 108 }
 109
 110 u_int
 111 winlink_count(struct winlinks *wwl)
 112 {
 113         struct winlink  *wl;
 114         u_int            n;
 115
 116         n = 0;
 117         RB_FOREACH(wl, winlinks, wwl)
 118                 n++;
 119
 120         return (n);
 121 }
 122
 123 struct winlink *
 124 winlink_add(struct winlinks *wwl, struct window *w, int idx)
 125 {
 126         struct winlink  *wl;
 127
 128         if (idx < 0) {
 129                 if ((idx = winlink_next_index(wwl, -idx - 1)) == -1)
 130                         return (NULL);
 131         } else if (winlink_find_by_index(wwl, idx) != NULL)
 132                 return (NULL);
 133
 134         wl = xcalloc(1, sizeof *wl);
 135         wl->idx = idx;
 136         wl->window = w;
 137         RB_INSERT(winlinks, wwl, wl);
 138
 139         w->references++;
 140
 141         return (wl);
 142 }
 143
 144 void
 145 winlink_remove(struct winlinks *wwl, struct winlink *wl)
 146 {
 147         struct window   *w = wl->window;
 148
 149         RB_REMOVE(winlinks, wwl, wl);
 150         if (wl->status_text != NULL)
 151                 xfree(wl->status_text);
 152         xfree(wl);
 153
 154         if (w->references == 0)
 155                 fatal("bad reference count");
 156         w->references--;
 157         if (w->references == 0)
 158                 window_destroy(w);
 159 }
 160
 161 struct winlink *
 162 winlink_next(struct winlink *wl)
 163 {
 164         return (RB_NEXT(winlinks, wwl, wl));
 165 }
 166
 167 struct winlink *
 168 winlink_previous(struct winlink *wl)
 169 {
 170         return (RB_PREV(winlinks, wwl, wl));
 171 }
 172
 173 void
 174 winlink_stack_push(struct winlink_stack *stack, struct winlink *wl)
 175 {
 176         if (wl == NULL)
 177                 return;
 178
 179         winlink_stack_remove(stack, wl);
 180         TAILQ_INSERT_HEAD(stack, wl, sentry);
 181 }
 182
 183 void
 184 winlink_stack_remove(struct winlink_stack *stack, struct winlink *wl)
 185 {
 186         struct winlink  *wl2;
 187
 188         if (wl == NULL)
 189                 return;
 190
 191         TAILQ_FOREACH(wl2, stack, sentry) {
 192                 if (wl2 == wl) {
 193                         TAILQ_REMOVE(stack, wl, sentry);
 194                         return;
 195                 }
 196         }
 197 }
 198
 199 int
 200 window_index(struct window *s, u_int *i)
 201 {
 202         for (*i = 0; *i < ARRAY_LENGTH(&windows); (*i)++) {
 203                 if (s == ARRAY_ITEM(&windows, *i))
 204                         return (0);
 205         }
 206         return (-1);
 207 }
 208
 209 struct window *
 210 window_create1(u_int sx, u_int sy)
 211 {
 212         struct window   *w;
 213         u_int            i;
 214
 215         w = xcalloc(1, sizeof *w);
 216         w->name = NULL;
 217         w->flags = 0;
 218
 219         TAILQ_INIT(&w->panes);
 220         w->active = NULL;
 221
 222         w->lastlayout = -1;
 223         w->layout_root = NULL;
 224
 225         w->sx = sx;
 226         w->sy = sy;
 227
 228         queue_window_name(w);
 229
 230         options_init(&w->options, &global_w_options);
 231
 232         for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
 233                 if (ARRAY_ITEM(&windows, i) == NULL) {
 234                         ARRAY_SET(&windows, i, w);
 235                         break;
 236                 }
 237         }
 238         if (i == ARRAY_LENGTH(&windows))
 239                 ARRAY_ADD(&windows, w);
 240         w->references = 0;
 241
 242         return (w);
 243 }
 244
 245 struct window *
 246 window_create(const char *name, const char *cmd, const char *shell,
 247     const char *cwd, struct environ *env, struct termios *tio,
 248     u_int sx, u_int sy, u_int hlimit,char **cause)
 249 {
 250         struct window           *w;
 251         struct window_pane      *wp;
 252
 253         w = window_create1(sx, sy);
 254         wp = window_add_pane(w, hlimit);
 255         layout_init(w);
 256         if (window_pane_spawn(wp, cmd, shell, cwd, env, tio, cause) != 0) {
 257                 window_destroy(w);
 258                 return (NULL);
 259         }
 260         w->active = TAILQ_FIRST(&w->panes);
 261         if (name != NULL) {
 262                 w->name = xstrdup(name);
 263                 options_set_number(&w->options, "automatic-rename", 0);
 264         } else
 265                 w->name = default_window_name(w);
 266         return (w);
 267 }
 268
 269 void
 270 window_destroy(struct window *w)
 271 {
 272         u_int   i;
 273
 274         if (window_index(w, &i) != 0)
 275                 fatalx("index not found");
 276         ARRAY_SET(&windows, i, NULL);
 277         while (!ARRAY_EMPTY(&windows) && ARRAY_LAST(&windows) == NULL)
 278                 ARRAY_TRUNC(&windows, 1);
 279
 280         if (w->layout_root != NULL)
 281                 layout_free(w);
 282
 283         evtimer_del(&w->name_timer);
 284
 285         options_free(&w->options);
 286
 287         window_destroy_panes(w);
 288
 289         if (w->name != NULL)
 290                 xfree(w->name);
 291         xfree(w);
 292 }
 293
 294 void
 295 window_resize(struct window *w, u_int sx, u_int sy)
 296 {
 297         w->sx = sx;
 298         w->sy = sy;
 299 }
 300
 301 void
 302 window_set_active_pane(struct window *w, struct window_pane *wp)
 303 {
 304         w->active = wp;
 305         while (!window_pane_visible(w->active)) {
 306                 w->active = TAILQ_PREV(w->active, window_panes, entry);
 307                 if (w->active == NULL)
 308                         w->active = TAILQ_LAST(&w->panes, window_panes);
 309                 if (w->active == wp)
 310                         return;
 311         }
 312 }
 313
 314 void
 315 window_set_active_at(struct window *w, u_int x, u_int y)
 316 {
 317         struct window_pane      *wp;
 318
 319         TAILQ_FOREACH(wp, &w->panes, entry) {
 320                 if (!window_pane_visible(wp))
 321                         continue;
 322                 if (x < wp->xoff || x >= wp->xoff + wp->sx)
 323                         continue;
 324                 if (y < wp->yoff || y >= wp->yoff + wp->sy)
 325                         continue;
 326                 window_set_active_pane(w, wp);
 327                 break;
 328         }
 329 }
 330
 331 struct window_pane *
 332 window_add_pane(struct window *w, u_int hlimit)
 333 {
 334         struct window_pane      *wp;
 335
 336         wp = window_pane_create(w, w->sx, w->sy, hlimit);
 337         if (TAILQ_EMPTY(&w->panes))
 338                 TAILQ_INSERT_HEAD(&w->panes, wp, entry);
 339         else
 340                 TAILQ_INSERT_AFTER(&w->panes, w->active, wp, entry);
 341         return (wp);
 342 }
 343
 344 void
 345 window_remove_pane(struct window *w, struct window_pane *wp)
 346 {
 347         w->active = TAILQ_PREV(wp, window_panes, entry);
 348         if (w->active == NULL)
 349                 w->active = TAILQ_NEXT(wp, entry);
 350
 351         TAILQ_REMOVE(&w->panes, wp, entry);
 352         window_pane_destroy(wp);
 353 }
 354
 355 struct window_pane *
 356 window_pane_at_index(struct window *w, u_int idx)
 357 {
 358         struct window_pane      *wp;
 359         u_int                    n;
 360
 361         n = 0;
 362         TAILQ_FOREACH(wp, &w->panes, entry) {
 363                 if (n == idx)
 364                         return (wp);
 365                 n++;
 366         }
 367         return (NULL);
 368 }
 369
 370 u_int
 371 window_pane_index(struct window *w, struct window_pane *wp)
 372 {
 373         struct window_pane      *wq;
 374         u_int                    n;
 375
 376         n = 0;
 377         TAILQ_FOREACH(wq, &w->panes, entry) {
 378                 if (wp == wq)
 379                         break;
 380                 n++;
 381         }
 382         return (n);
 383 }
 384
 385 u_int
 386 window_count_panes(struct window *w)
 387 {
 388         struct window_pane      *wp;
 389         u_int                    n;
 390
 391         n = 0;
 392         TAILQ_FOREACH(wp, &w->panes, entry)
 393                 n++;
 394         return (n);
 395 }
 396
 397 void
 398 window_destroy_panes(struct window *w)
 399 {
 400         struct window_pane      *wp;
 401
 402         while (!TAILQ_EMPTY(&w->panes)) {
 403                 wp = TAILQ_FIRST(&w->panes);
 404                 TAILQ_REMOVE(&w->panes, wp, entry);
 405                 window_pane_destroy(wp);
 406         }
 407 }
 408
 409 struct window_pane *
 410 window_pane_create(struct window *w, u_int sx, u_int sy, u_int hlimit)
 411 {
 412         struct window_pane      *wp;
 413
 414         wp = xcalloc(1, sizeof *wp);
 415         wp->window = w;
 416
 417         wp->cmd = NULL;
 418         wp->shell = NULL;
 419         wp->cwd = NULL;
 420
 421         wp->fd = -1;
 422         wp->event = NULL;
 423
 424         wp->mode = NULL;
 425
 426         wp->layout_cell = NULL;
 427
 428         wp->xoff = 0;
 429         wp->yoff = 0;
 430
 431         wp->sx = sx;
 432         wp->sy = sy;
 433
 434         wp->pipe_fd = -1;
 435         wp->pipe_off = 0;
 436         wp->pipe_event = NULL;
 437
 438         wp->saved_grid = NULL;
 439
 440         screen_init(&wp->base, sx, sy, hlimit);
 441         wp->screen = &wp->base;
 442
 443         input_init(wp);
 444
 445         return (wp);
 446 }
 447
 448 void
 449 window_pane_destroy(struct window_pane *wp)
 450 {
 451         if (wp->fd != -1) {
 452                 close(wp->fd);
 453                 bufferevent_free(wp->event);
 454         }
 455
 456         input_free(wp);
 457
 458         window_pane_reset_mode(wp);
 459         screen_free(&wp->base);
 460         if (wp->saved_grid != NULL)
 461                 grid_destroy(wp->saved_grid);
 462
 463         if (wp->pipe_fd != -1) {
 464                 close(wp->pipe_fd);
 465                 bufferevent_free(wp->pipe_event);
 466         }
 467
 468         if (wp->cwd != NULL)
 469                 xfree(wp->cwd);
 470         if (wp->shell != NULL)
 471                 xfree(wp->shell);
 472         if (wp->cmd != NULL)
 473                 xfree(wp->cmd);
 474         xfree(wp);
 475 }
 476
 477 int
 478 window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 479     const char *cwd, struct environ *env, struct termios *tio, char **cause)
 480 {
 481         struct winsize           ws;
 482         int                      mode;
 483         char                    *argv0, **varp, *var;
 484         ARRAY_DECL(, char *)     varlist;
 485         struct environ_entry    *envent;
 486         const char              *ptr;
 487         struct termios           tio2;
 488         u_int                    i;
 489
 490         if (wp->fd != -1) {
 491                 close(wp->fd);
 492                 bufferevent_free(wp->event);
 493         }
 494         if (cmd != NULL) {
 495                 if (wp->cmd != NULL)
 496                         xfree(wp->cmd);
 497                 wp->cmd = xstrdup(cmd);
 498         }
 499         if (shell != NULL) {
 500                 if (wp->shell != NULL)
 501                         xfree(wp->shell);
 502                 wp->shell = xstrdup(shell);
 503         }
 504         if (cwd != NULL) {
 505                 if (wp->cwd != NULL)
 506                         xfree(wp->cwd);
 507                 wp->cwd = xstrdup(cwd);
 508         }
 509
 510         memset(&ws, 0, sizeof ws);
 511         ws.ws_col = screen_size_x(&wp->base);
 512         ws.ws_row = screen_size_y(&wp->base);
 513
 514         switch (wp->pid = forkpty(&wp->fd, wp->tty, NULL, &ws)) {
 515         case -1:
 516                 wp->fd = -1;
 517                 xasprintf(cause, "%s: %s", cmd, strerror(errno));
 518                 return (-1);
 519         case 0:
 520                 if (chdir(wp->cwd) != 0)
 521                         chdir("/");
 522
 523                 if (tcgetattr(STDIN_FILENO, &tio2) != 0)
 524                         fatal("tcgetattr failed");
 525                 if (tio != NULL)
 526                         memcpy(tio2.c_cc, tio->c_cc, sizeof tio2.c_cc);
 527                 tio2.c_cc[VERASE] = '\177';
 528                 if (tcsetattr(STDIN_FILENO, TCSANOW, &tio2) != 0)
 529                         fatal("tcgetattr failed");
 530
 531                 ARRAY_INIT(&varlist);
 532                 for (varp = environ; *varp != NULL; varp++) {
 533                         var = xstrdup(*varp);
 534                         var[strcspn(var, "=")] = '\0';
 535                         ARRAY_ADD(&varlist, var);
 536                 }
 537                 for (i = 0; i < ARRAY_LENGTH(&varlist); i++) {
 538                         var = ARRAY_ITEM(&varlist, i);
 539                         unsetenv(var);
 540                 }
 541                 RB_FOREACH(envent, environ, env) {
 542                         if (envent->value != NULL)
 543                                 setenv(envent->name, envent->value, 1);
 544                 }
 545
 546                 server_signal_clear();
 547                 log_close();
 548
 549                 if (*wp->cmd != '\0') {
 550                         /* Set SHELL but only if it is currently not useful. */
 551                         shell = getenv("SHELL");
 552                         if (shell == NULL || *shell == '\0' || areshell(shell))
 553                                 setenv("SHELL", wp->shell, 1);
 554
 555                         execl(_PATH_BSHELL, "sh", "-c", wp->cmd, (char *) NULL);
 556                         fatal("execl failed");
 557                 }
 558
 559                 /* No command; fork a login shell. */
 560                 ptr = strrchr(wp->shell, '/');
 561                 if (ptr != NULL && *(ptr + 1) != '\0')
 562                         xasprintf(&argv0, "-%s", ptr + 1);
 563                 else
 564                         xasprintf(&argv0, "-%s", wp->shell);
 565                 setenv("SHELL", wp->shell, 1);
 566                 execl(wp->shell, argv0, (char *) NULL);
 567                 fatal("execl failed");
 568         }
 569
 570         if ((mode = fcntl(wp->fd, F_GETFL)) == -1)
 571                 fatal("fcntl failed");
 572         if (fcntl(wp->fd, F_SETFL, mode|O_NONBLOCK) == -1)
 573                 fatal("fcntl failed");
 574         if (fcntl(wp->fd, F_SETFD, FD_CLOEXEC) == -1)
 575                 fatal("fcntl failed");
 576         wp->event = bufferevent_new(wp->fd,
 577             window_pane_read_callback, NULL, window_pane_error_callback, wp);
 578         bufferevent_enable(wp->event, EV_READ|EV_WRITE);
 579
 580         return (0);
 581 }
 582
 583 /* ARGSUSED */
 584 void
 585 window_pane_read_callback(unused struct bufferevent *bufev, void *data)
 586 {
 587         struct window_pane *wp = data;
 588
 589         window_pane_parse(wp);
 590 }
 591
 592 /* ARGSUSED */
 593 void
 594 window_pane_error_callback(
 595     unused struct bufferevent *bufev, unused short what, void *data)
 596 {
 597         struct window_pane *wp = data;
 598
 599         server_destroy_pane(wp);
 600 }
 601
 602 void
 603 window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
 604 {
 605         struct winsize  ws;
 606
 607         if (sx == wp->sx && sy == wp->sy)
 608                 return;
 609         wp->sx = sx;
 610         wp->sy = sy;
 611
 612         memset(&ws, 0, sizeof ws);
 613         ws.ws_col = sx;
 614         ws.ws_row = sy;
 615
 616         screen_resize(&wp->base, sx, sy);
 617         if (wp->mode != NULL)
 618                 wp->mode->resize(wp, sx, sy);
 619
 620         if (wp->fd != -1 && ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
 621 #ifdef __sun
 622                 /*
 623                  * Some versions of Solaris apparently can return an error when
 624                  * resizing; don't know why this happens, can't reproduce on
 625                  * other platforms and ignoring it doesn't seem to cause any
 626                  * issues.
 627                  */
 628                 if (errno != EINVAL)
 629 #endif
 630                 fatal("ioctl failed");
 631 }
 632
 633 int
 634 window_pane_set_mode(struct window_pane *wp, const struct window_mode *mode)
 635 {
 636         struct screen   *s;
 637
 638         if (wp->mode != NULL)
 639                 return (1);
 640         wp->mode = mode;
 641
 642         if ((s = wp->mode->init(wp)) != NULL)
 643                 wp->screen = s;
 644         wp->flags |= PANE_REDRAW;
 645         return (0);
 646 }
 647
 648 void
 649 window_pane_reset_mode(struct window_pane *wp)
 650 {
 651         if (wp->mode == NULL)
 652                 return;
 653
 654         wp->mode->free(wp);
 655         wp->mode = NULL;
 656
 657         wp->screen = &wp->base;
 658         wp->flags |= PANE_REDRAW;
 659 }
 660
 661 void
 662 window_pane_parse(struct window_pane *wp)
 663 {
 664         char   *data;
 665         size_t  new_size;
 666
 667         new_size = EVBUFFER_LENGTH(wp->event->input) - wp->pipe_off;
 668         if (wp->pipe_fd != -1 && new_size > 0) {
 669                 data = EVBUFFER_DATA(wp->event->input);
 670                 bufferevent_write(wp->pipe_event, data, new_size);
 671         }
 672
 673         input_parse(wp);
 674
 675         wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
 676 }
 677
 678 void
 679 window_pane_key(struct window_pane *wp, struct client *c, int key)
 680 {
 681         struct window_pane      *wp2;
 682
 683         if (!window_pane_visible(wp))
 684                 return;
 685
 686         if (wp->mode != NULL) {
 687                 if (wp->mode->key != NULL)
 688                         wp->mode->key(wp, c, key);
 689                 return;
 690         }
 691
 692         if (wp->fd == -1)
 693                 return;
 694         input_key(wp, key);
 695         if (options_get_number(&wp->window->options, "synchronize-panes")) {
 696                 TAILQ_FOREACH(wp2, &wp->window->panes, entry) {
 697                         if (wp2 == wp || wp2->mode != NULL)
 698                                 continue;
 699                         if (wp2->fd != -1 && window_pane_visible(wp2))
 700                                 input_key(wp2, key);
 701                 }
 702         }
 703 }
 704
 705 void
 706 window_pane_mouse(
 707     struct window_pane *wp, struct client *c, struct mouse_event *m)
 708 {
 709         if (!window_pane_visible(wp))
 710                 return;
 711
 712         if (m->x < wp->xoff || m->x >= wp->xoff + wp->sx)
 713                 return;
 714         if (m->y < wp->yoff || m->y >= wp->yoff + wp->sy)
 715                 return;
 716         m->x -= wp->xoff;
 717         m->y -= wp->yoff;
 718
 719         if (wp->mode != NULL) {
 720                 if (wp->mode->mouse != NULL)
 721                         wp->mode->mouse(wp, c, m);
 722         } else if (wp->fd != -1)
 723                 input_mouse(wp, m);
 724 }
 725
 726 int
 727 window_pane_visible(struct window_pane *wp)
 728 {
 729         struct window   *w = wp->window;
 730
 731         if (wp->xoff >= w->sx || wp->yoff >= w->sy)
 732                 return (0);
 733         if (wp->xoff + wp->sx > w->sx || wp->yoff + wp->sy > w->sy)
 734                 return (0);
 735         return (1);
 736 }
 737
 738 char *
 739 window_pane_search(struct window_pane *wp, const char *searchstr, u_int *lineno)
 740 {
 741         struct screen   *s = &wp->base;
 742         char            *newsearchstr, *line, *msg;
 743         u_int            i;
 744
 745         msg = NULL;
 746         xasprintf(&newsearchstr, "*%s*", searchstr);
 747
 748         for (i = 0; i < screen_size_y(s); i++) {
 749                 line = grid_view_string_cells(s->grid, 0, i, screen_size_x(s));
 750                 if (fnmatch(newsearchstr, line, 0) == 0) {
 751                         msg = line;
 752                         if (lineno != NULL)
 753                                 *lineno = i;
 754                         break;
 755                 }
 756                 xfree(line);
 757         }
 758
 759         xfree(newsearchstr);
 760         return (msg);
 761 }