vi/vs_msg.c

   1 /*-
   2  * Copyright (c) 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "$Id: vs_msg.c,v 10.78 1996/12/04 19:10:04 bostic Exp $ (Berkeley) $Date: 1996/12/04 19:10:04 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26
  27 #include "../common/common.h"
  28 #include "vi.h"
  29
  30 typedef enum {
  31         SCROLL_W,                       /* User wait. */
  32         SCROLL_W_EX,                    /* User wait, or enter : to continue. */
  33         SCROLL_W_QUIT                   /* User wait, or enter q to quit. */
  34                                         /*
  35                                          * SCROLL_W_QUIT has another semantic
  36                                          * -- only wait if the screen is full
  37                                          */
  38 } sw_t;
  39
  40 static void     vs_divider __P((SCR *));
  41 static void     vs_msgsave __P((SCR *, mtype_t, char *, size_t));
  42 static void     vs_output __P((SCR *, mtype_t, const char *, int));
  43 static void     vs_scroll __P((SCR *, int *, sw_t));
  44 static void     vs_wait __P((SCR *, int *, sw_t));
  45
  46 /*
  47  * vs_busy --
  48  *      Display, update or clear a busy message.
  49  *
  50  * This routine is the default editor interface for vi busy messages.  It
  51  * implements a standard strategy of stealing lines from the bottom of the
  52  * vi text screen.  Screens using an alternate method of displaying busy
  53  * messages, e.g. X11 clock icons, should set their scr_busy function to the
  54  * correct function before calling the main editor routine.
  55  *
  56  * PUBLIC: void vs_busy __P((SCR *, const char *, busy_t));
  57  */
  58 void
  59 vs_busy(sp, msg, btype)
  60         SCR *sp;
  61         const char *msg;
  62         busy_t btype;
  63 {
  64         GS *gp;
  65         VI_PRIVATE *vip;
  66         static const char flagc[] = "|/-\\";
  67         struct timeval tv;
  68         size_t len, notused;
  69         const char *p;
  70
  71         /* Ex doesn't display busy messages. */
  72         if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE))
  73                 return;
  74
  75         gp = sp->gp;
  76         vip = VIP(sp);
  77
  78         /*
  79          * Most of this routine is to deal with the screen sharing real estate
  80          * between the normal edit messages and the busy messages.  Logically,
  81          * all that's needed is something that puts up a message, periodically
  82          * updates it, and then goes away.
  83          */
  84         switch (btype) {
  85         case BUSY_ON:
  86                 ++vip->busy_ref;
  87                 if (vip->totalcount != 0 || vip->busy_ref != 1)
  88                         break;
  89
  90                 /* Initialize state for updates. */
  91                 vip->busy_ch = 0;
  92                 (void)gettimeofday(&vip->busy_tv, NULL);
  93
  94                 /* Save the current cursor. */
  95                 (void)gp->scr_cursor(sp, &vip->busy_oldy, &vip->busy_oldx);
  96
  97                 /* Display the busy message. */
  98                 p = msg_cat(sp, msg, &len);
  99                 (void)gp->scr_move(sp, LASTLINE(sp), 0);
 100                 (void)gp->scr_addstr(sp, p, len);
 101                 (void)gp->scr_cursor(sp, &notused, &vip->busy_fx);
 102                 (void)gp->scr_clrtoeol(sp);
 103                 (void)gp->scr_move(sp, LASTLINE(sp), vip->busy_fx);
 104                 break;
 105         case BUSY_OFF:
 106                 if (vip->busy_ref == 0)
 107                         break;
 108                 --vip->busy_ref;
 109
 110                 /*
 111                  * If the line isn't in use for another purpose, clear it.
 112                  * Always return to the original position.
 113                  */
 114                 if (vip->totalcount == 0 && vip->busy_ref == 0) {
 115                         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 116                         (void)gp->scr_clrtoeol(sp);
 117                 }
 118                 (void)gp->scr_move(sp, vip->busy_oldy, vip->busy_oldx);
 119                 break;
 120         case BUSY_UPDATE:
 121                 if (vip->totalcount != 0 || vip->busy_ref == 0)
 122                         break;
 123
 124                 /* Update no more than every 1/8 of a second. */
 125                 (void)gettimeofday(&tv, NULL);
 126                 if (((tv.tv_sec - vip->busy_tv.tv_sec) * 1000000 +
 127                     (tv.tv_usec - vip->busy_tv.tv_usec)) < 125000)
 128                         return;
 129                 vip->busy_tv = tv;
 130
 131                 /* Display the update. */
 132                 if (vip->busy_ch == sizeof(flagc) - 1)
 133                         vip->busy_ch = 0;
 134                 (void)gp->scr_move(sp, LASTLINE(sp), vip->busy_fx);
 135                 (void)gp->scr_addstr(sp, flagc + vip->busy_ch++, 1);
 136                 (void)gp->scr_move(sp, LASTLINE(sp), vip->busy_fx);
 137                 break;
 138         }
 139         (void)gp->scr_refresh(sp, 0);
 140 }
 141
 142 /*
 143  * vs_home --
 144  *      Home the cursor to the bottom row, left-most column.
 145  *
 146  * PUBLIC: void vs_home __P((SCR *));
 147  */
 148 void
 149 vs_home(sp)
 150         SCR *sp;
 151 {
 152         (void)sp->gp->scr_move(sp, LASTLINE(sp), 0);
 153         (void)sp->gp->scr_refresh(sp, 0);
 154 }
 155
 156 /*
 157  * vs_update --
 158  *      Update a command.
 159  *
 160  * PUBLIC: void vs_update __P((SCR *, const char *, const char *));
 161  */
 162 void
 163 vs_update(sp, m1, m2)
 164         SCR *sp;
 165         const char *m1, *m2;
 166 {
 167         GS *gp;
 168         size_t len, mlen, oldx, oldy;
 169
 170         gp = sp->gp;
 171
 172         /*
 173          * This routine displays a message on the bottom line of the screen,
 174          * without updating any of the command structures that would keep it
 175          * there for any period of time, i.e. it is overwritten immediately.
 176          *
 177          * It's used by the ex read and ! commands when the user's command is
 178          * expanded, and by the ex substitution confirmation prompt.
 179          */
 180         if (F_ISSET(sp, SC_SCR_EXWROTE)) {
 181                 (void)ex_printf(sp,
 182                     "%s\n", m1 == NULL? "" : m1, m2 == NULL ? "" : m2);
 183                 (void)ex_fflush(sp);
 184         }
 185
 186         /*
 187          * Save the cursor position, the substitute-with-confirmation code
 188          * will have already set it correctly.
 189          */
 190         (void)gp->scr_cursor(sp, &oldy, &oldx);
 191
 192         /* Clear the bottom line. */
 193         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 194         (void)gp->scr_clrtoeol(sp);
 195
 196         /*
 197          * XXX
 198          * Don't let long file names screw up the screen.
 199          */
 200         if (m1 != NULL) {
 201                 mlen = len = strlen(m1);
 202                 if (len > sp->cols - 2)
 203                         mlen = len = sp->cols - 2;
 204                 (void)gp->scr_addstr(sp, m1, mlen);
 205         } else
 206                 len = 0;
 207         if (m2 != NULL) {
 208                 mlen = strlen(m2);
 209                 if (len + mlen > sp->cols - 2)
 210                         mlen = (sp->cols - 2) - len;
 211                 (void)gp->scr_addstr(sp, m2, mlen);
 212         }
 213
 214         (void)gp->scr_move(sp, oldy, oldx);
 215         (void)gp->scr_refresh(sp, 0);
 216 }
 217
 218 /*
 219  * vs_msg --
 220  *      Display ex output or error messages for the screen.
 221  *
 222  * This routine is the default editor interface for all ex output, and all ex
 223  * and vi error/informational messages.  It implements the standard strategy
 224  * of stealing lines from the bottom of the vi text screen.  Screens using an
 225  * alternate method of displaying messages, e.g. dialog boxes, should set their
 226  * scr_msg function to the correct function before calling the editor.
 227  *
 228  * PUBLIC: void vs_msg __P((SCR *, mtype_t, char *, size_t));
 229  */
 230 void
 231 vs_msg(sp, mtype, line, len)
 232         SCR *sp;
 233         mtype_t mtype;
 234         char *line;
 235         size_t len;
 236 {
 237         GS *gp;
 238         VI_PRIVATE *vip;
 239         size_t maxcols, oldx, oldy, padding;
 240         const char *e, *s, *t;
 241
 242         gp = sp->gp;
 243         vip = VIP(sp);
 244
 245         /*
 246          * Ring the bell if it's scheduled.
 247          *
 248          * XXX
 249          * Shouldn't we save this, too?
 250          */
 251         if (F_ISSET(sp, SC_TINPUT_INFO) || F_ISSET(gp, G_BELLSCHED))
 252                 if (F_ISSET(sp, SC_SCR_VI)) {
 253                         F_CLR(gp, G_BELLSCHED);
 254                         (void)gp->scr_bell(sp);
 255                 } else
 256                         F_SET(gp, G_BELLSCHED);
 257
 258         /*
 259          * If vi is using the error line for text input, there's no screen
 260          * real-estate for the error message.  Nothing to do without some
 261          * information as to how important the error message is.
 262          */
 263         if (F_ISSET(sp, SC_TINPUT_INFO))
 264                 return;
 265
 266         /*
 267          * Ex or ex controlled screen output.
 268          *
 269          * If output happens during startup, e.g., a .exrc file, we may be
 270          * in ex mode but haven't initialized the screen.  Initialize here,
 271          * and in this case, stay in ex mode.
 272          *
 273          * If the SC_SCR_EXWROTE bit is set, then we're switching back and
 274          * forth between ex and vi, but the screen is trashed and we have
 275          * to respect that.  Switch to ex mode long enough to put out the
 276          * message.
 277          *
 278          * If the SC_EX_WAIT_NO bit is set, turn it off -- we're writing to
 279          * the screen, so previous opinions are ignored.
 280          */
 281         if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)) {
 282                 if (!F_ISSET(sp, SC_SCR_EX))
 283                         if (F_ISSET(sp, SC_SCR_EXWROTE)) {
 284                                 if (sp->gp->scr_screen(sp, SC_EX))
 285                                         return;
 286                         } else
 287                                 if (ex_init(sp))
 288                                         return;
 289
 290                 if (mtype == M_ERR)
 291                         (void)gp->scr_attr(sp, SA_INVERSE, 1);
 292                 (void)printf("%.*s", (int)len, line);
 293                 if (mtype == M_ERR)
 294                         (void)gp->scr_attr(sp, SA_INVERSE, 0);
 295                 (void)fflush(stdout);
 296
 297                 F_CLR(sp, SC_EX_WAIT_NO);
 298
 299                 if (!F_ISSET(sp, SC_SCR_EX))
 300                         (void)sp->gp->scr_screen(sp, SC_VI);
 301                 return;
 302         }
 303
 304         /* If the vi screen isn't ready, save the message. */
 305         if (!F_ISSET(sp, SC_SCR_VI)) {
 306                 (void)vs_msgsave(sp, mtype, line, len);
 307                 return;
 308         }
 309
 310         /* Save the cursor position. */
 311         (void)gp->scr_cursor(sp, &oldy, &oldx);
 312
 313         /* If it's an ex output message, just write it out. */
 314         if (mtype == M_NONE) {
 315                 vs_output(sp, mtype, line, len);
 316                 goto ret;
 317         }
 318
 319         /*
 320          * If it's a vi message, strip the trailing <newline> so we can
 321          * try and paste messages together.
 322          */
 323         if (line[len - 1] == '\n')
 324                 --len;
 325
 326         /*
 327          * If a message won't fit on a single line, try to split on a <blank>.
 328          * If a subsequent message fits on the same line, write a separator
 329          * and output it.  Otherwise, put out a newline.
 330          *
 331          * Need up to two padding characters normally; a semi-colon and a
 332          * separating space.  If only a single line on the screen, add some
 333          * more for the trailing continuation message.
 334          *
 335          * XXX
 336          * Assume that periods and semi-colons take up a single column on the
 337          * screen.
 338          *
 339          * XXX
 340          * There are almost certainly pathological cases that will break this
 341          * code.
 342          */
 343         if (IS_ONELINE(sp))
 344                 (void)msg_cmsg(sp, CMSG_CONT_S, &padding);
 345         else
 346                 padding = 0;
 347         padding += 2;
 348
 349         maxcols = sp->cols - 1;
 350         if (vip->lcontinue != 0)
 351                 if (len + vip->lcontinue + padding > maxcols)
 352                         vs_output(sp, vip->mtype, ".\n", 2);
 353                 else  {
 354                         vs_output(sp, vip->mtype, ";", 1);
 355                         vs_output(sp, M_NONE, " ", 1);
 356                 }
 357         vip->mtype = mtype;
 358         for (s = line;; s = t) {
 359                 for (; len > 0 && isblank(*s); --len, ++s);
 360                 if (len == 0)
 361                         break;
 362                 if (len + vip->lcontinue > maxcols) {
 363                         for (e = s + (maxcols - vip->lcontinue);
 364                             e > s && !isblank(*e); --e);
 365                         if (e == s)
 366                                  e = t = s + (maxcols - vip->lcontinue);
 367                         else
 368                                 for (t = e; isblank(e[-1]); --e);
 369                 } else
 370                         e = t = s + len;
 371
 372                 /*
 373                  * If the message ends in a period, discard it, we want to
 374                  * gang messages where possible.
 375                  */
 376                 len -= t - s;
 377                 if (len == 0 && (e - s) > 1 && s[(e - s) - 1] == '.')
 378                         --e;
 379                 vs_output(sp, mtype, s, e - s);
 380
 381                 if (len != 0)
 382                         vs_output(sp, M_NONE, "\n", 1);
 383
 384                 if (INTERRUPTED(sp))
 385                         break;
 386         }
 387
 388 ret:    (void)gp->scr_move(sp, oldy, oldx);
 389         (void)gp->scr_refresh(sp, 0);
 390 }
 391
 392 /*
 393  * vs_output --
 394  *      Output the text to the screen.
 395  */
 396 static void
 397 vs_output(sp, mtype, line, llen)
 398         SCR *sp;
 399         mtype_t mtype;
 400         const char *line;
 401         int llen;
 402 {
 403         CHAR_T *kp;
 404         GS *gp;
 405         VI_PRIVATE *vip;
 406         size_t chlen, notused;
 407         int ch, len, rlen, tlen;
 408         const char *p, *t;
 409         char *cbp, *ecbp, cbuf[128];
 410
 411         gp = sp->gp;
 412         vip = VIP(sp);
 413         for (p = line, rlen = llen; llen > 0;) {
 414                 /* Get the next physical line. */
 415                 if ((p = memchr(line, '\n', llen)) == NULL)
 416                         len = llen;
 417                 else
 418                         len = p - line;
 419
 420                 /*
 421                  * The max is sp->cols characters, and we may have already
 422                  * written part of the line.
 423                  */
 424                 if (len + vip->lcontinue > sp->cols)
 425                         len = sp->cols - vip->lcontinue;
 426
 427                 /*
 428                  * If the first line output, do nothing.  If the second line
 429                  * output, draw the divider line.  If drew a full screen, we
 430                  * remove the divider line.  If it's a continuation line, move
 431                  * to the continuation point, else, move the screen up.
 432                  */
 433                 if (vip->lcontinue == 0) {
 434                         if (!IS_ONELINE(sp)) {
 435                                 if (vip->totalcount == 1) {
 436                                         (void)gp->scr_move(sp,
 437                                             LASTLINE(sp) - 1, 0);
 438                                         (void)gp->scr_clrtoeol(sp);
 439                                         (void)vs_divider(sp);
 440                                         F_SET(vip, VIP_DIVIDER);
 441                                         ++vip->totalcount;
 442                                         ++vip->linecount;
 443                                 }
 444                                 if (vip->totalcount == sp->t_maxrows &&
 445                                     F_ISSET(vip, VIP_DIVIDER)) {
 446                                         --vip->totalcount;
 447                                         --vip->linecount;
 448                                         F_CLR(vip, VIP_DIVIDER);
 449                                 }
 450                         }
 451                         if (vip->totalcount != 0)
 452                                 vs_scroll(sp, NULL, SCROLL_W_QUIT);
 453
 454                         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 455                         ++vip->totalcount;
 456                         ++vip->linecount;
 457
 458                         if (INTERRUPTED(sp))
 459                                 break;
 460                 } else
 461                         (void)gp->scr_move(sp, LASTLINE(sp), vip->lcontinue);
 462
 463                 /* Error messages are in inverse video. */
 464                 if (mtype == M_ERR)
 465                         (void)gp->scr_attr(sp, SA_INVERSE, 1);
 466
 467                 /* Display the line, doing character translation. */
 468 #define FLUSH {                                                         \
 469         *cbp = '\0';                                                    \
 470         (void)gp->scr_addstr(sp, cbuf, cbp - cbuf);                     \
 471         cbp = cbuf;                                                     \
 472 }
 473                 ecbp = (cbp = cbuf) + sizeof(cbuf) - 1;
 474                 for (t = line, tlen = len; tlen--; ++t) {
 475                         ch = *t;
 476                         /*
 477                          * Replace tabs with spaces, there are places in
 478                          * ex that do column calculations without looking
 479                          * at <tabs> -- and all routines that care about
 480                          * <tabs> do their own expansions.  This catches
 481                          * <tabs> in things like tag search strings.
 482                          */
 483                         if (ch == '\t')
 484                                 ch = ' ';
 485                         chlen = KEY_LEN(sp, ch);
 486                         if (cbp + chlen >= ecbp)
 487                                 FLUSH;
 488                         for (kp = KEY_NAME(sp, ch); chlen--;)
 489                                 *cbp++ = *kp++;
 490                 }
 491                 if (cbp > cbuf)
 492                         FLUSH;
 493                 if (mtype == M_ERR)
 494                         (void)gp->scr_attr(sp, SA_INVERSE, 0);
 495
 496                 /* Clear the rest of the line. */
 497                 (void)gp->scr_clrtoeol(sp);
 498
 499                 /* If we loop, it's a new line. */
 500                 vip->lcontinue = 0;
 501
 502                 /* Reset for the next line. */
 503                 line += len;
 504                 llen -= len;
 505                 if (p != NULL) {
 506                         ++line;
 507                         --llen;
 508                 }
 509         }
 510
 511         /* Set up next continuation line. */
 512         if (p == NULL)
 513                 gp->scr_cursor(sp, &notused, &vip->lcontinue);
 514 }
 515
 516 /*
 517  * vs_ex_resolve --
 518  *      Deal with ex message output.
 519  *
 520  * This routine is called when exiting a colon command to resolve any ex
 521  * output that may have occurred.
 522  *
 523  * PUBLIC: int vs_ex_resolve __P((SCR *, int *));
 524  */
 525 int
 526 vs_ex_resolve(sp, continuep)
 527         SCR *sp;
 528         int *continuep;
 529 {
 530         EVENT ev;
 531         GS *gp;
 532         VI_PRIVATE *vip;
 533         sw_t wtype;
 534
 535         gp = sp->gp;
 536         vip = VIP(sp);
 537         *continuep = 0;
 538
 539         /* If we ran any ex command, we can't trust the cursor position. */
 540         F_SET(vip, VIP_CUR_INVALID);
 541
 542         /* Terminate any partially written message. */
 543         if (vip->lcontinue != 0) {
 544                 vs_output(sp, vip->mtype, ".", 1);
 545                 vip->lcontinue = 0;
 546
 547                 vip->mtype = M_NONE;
 548         }
 549
 550         /*
 551          * If we switched out of the vi screen into ex, switch back while we
 552          * figure out what to do with the screen and potentially get another
 553          * command to execute.
 554          *
 555          * If we didn't switch into ex, we're not required to wait, and less
 556          * than 2 lines of output, we can continue without waiting for the
 557          * wait.
 558          *
 559          * Note, all other code paths require waiting, so we leave the report
 560          * of modified lines until later, so that we won't wait for no other
 561          * reason than a threshold number of lines were modified.  This means
 562          * we display cumulative line modification reports for groups of ex
 563          * commands.  That seems right to me (well, at least not wrong).
 564          */
 565         if (F_ISSET(sp, SC_SCR_EXWROTE)) {
 566                 if (sp->gp->scr_screen(sp, SC_VI))
 567                         return (1);
 568         } else
 569                 if (!F_ISSET(sp, SC_EX_WAIT_YES) && vip->totalcount < 2) {
 570                         F_CLR(sp, SC_EX_WAIT_NO);
 571                         return (0);
 572                 }
 573
 574         /* Clear the required wait flag, it's no longer needed. */
 575         F_CLR(sp, SC_EX_WAIT_YES);
 576
 577         /*
 578          * Wait, unless explicitly told not to wait or the user interrupted
 579          * the command.  If the user is leaving the screen, for any reason,
 580          * they can't continue with further ex commands.
 581          */
 582         if (!F_ISSET(sp, SC_EX_WAIT_NO) && !INTERRUPTED(sp)) {
 583                 wtype = F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE |
 584                     SC_FSWITCH | SC_SSWITCH) ? SCROLL_W : SCROLL_W_EX;
 585                 if (F_ISSET(sp, SC_SCR_EXWROTE))
 586                         vs_wait(sp, continuep, wtype);
 587                 else
 588                         vs_scroll(sp, continuep, wtype);
 589                 if (*continuep)
 590                         return (0);
 591         }
 592
 593         /* If ex wrote on the screen, refresh the screen image. */
 594         if (F_ISSET(sp, SC_SCR_EXWROTE))
 595                 F_SET(vip, VIP_N_EX_PAINT);
 596
 597         /*
 598          * If we're not the bottom of the split screen stack, the screen
 599          * image itself is wrong, so redraw everything.
 600          */
 601         if (sp->q.cqe_next != (void *)&sp->gp->dq)
 602                 F_SET(sp, SC_SCR_REDRAW);
 603
 604         /* If ex changed the underlying file, the map itself is wrong. */
 605         if (F_ISSET(vip, VIP_N_EX_REDRAW))
 606                 F_SET(sp, SC_SCR_REFORMAT);
 607
 608         /* Ex may have switched out of the alternate screen, return. */
 609         (void)gp->scr_attr(sp, SA_ALTERNATE, 1);
 610
 611         /*
 612          * Whew.  We're finally back home, after what feels like years.
 613          * Kiss the ground.
 614          */
 615         F_CLR(sp, SC_SCR_EXWROTE | SC_EX_WAIT_NO);
 616
 617         /*
 618          * We may need to repaint some of the screen, e.g.:
 619          *
 620          *      :set
 621          *      :!ls
 622          *
 623          * gives us a combination of some lines that are "wrong", and a need
 624          * for a full refresh.
 625          */
 626         if (vip->totalcount > 1) {
 627                 /* Set up the redraw of the overwritten lines. */
 628                 ev.e_event = E_REPAINT;
 629                 ev.e_flno = vip->totalcount >=
 630                     sp->rows ? 1 : sp->rows - vip->totalcount;
 631                 ev.e_tlno = sp->rows;
 632
 633                 /* Reset the count of overwriting lines. */
 634                 vip->linecount = vip->lcontinue = vip->totalcount = 0;
 635
 636                 /* Redraw. */
 637                 (void)v_erepaint(sp, &ev);
 638         } else
 639                 /* Reset the count of overwriting lines. */
 640                 vip->linecount = vip->lcontinue = vip->totalcount = 0;
 641
 642         return (0);
 643 }
 644
 645 /*
 646  * vs_resolve --
 647  *      Deal with message output.
 648  *
 649  * PUBLIC: int vs_resolve __P((SCR *, SCR *, int));
 650  */
 651 int
 652 vs_resolve(sp, csp, forcewait)
 653         SCR *sp, *csp;
 654         int forcewait;
 655 {
 656         EVENT ev;
 657         GS *gp;
 658         MSGS *mp;
 659         VI_PRIVATE *vip;
 660         size_t oldy, oldx;
 661         int redraw;
 662
 663         /*
 664          * Vs_resolve is called from the main vi loop and the refresh function
 665          * to periodically ensure that the user has seen any messages that have
 666          * been displayed and that any status lines are correct.  The sp screen
 667          * is the screen we're checking, usually the current screen.  When it's
 668          * not, csp is the current screen, used for final cursor positioning.
 669          */
 670         gp = sp->gp;
 671         vip = VIP(sp);
 672         if (csp == NULL)
 673                 csp = sp;
 674
 675         /* Save the cursor position. */
 676         (void)gp->scr_cursor(csp, &oldy, &oldx);
 677
 678         /* Ring the bell if it's scheduled. */
 679         if (F_ISSET(gp, G_BELLSCHED)) {
 680                 F_CLR(gp, G_BELLSCHED);
 681                 (void)gp->scr_bell(sp);
 682         }
 683
 684         /* Display new file status line. */
 685         if (F_ISSET(sp, SC_STATUS)) {
 686                 F_CLR(sp, SC_STATUS);
 687                 msgq_status(sp, sp->lno, MSTAT_TRUNCATE);
 688         }
 689
 690         /* Report on line modifications. */
 691         mod_rpt(sp);
 692
 693         /*
 694          * Flush any saved messages.  If the screen isn't ready, refresh
 695          * it.  (A side-effect of screen refresh is that we can display
 696          * messages.)  Once this is done, don't trust the cursor.  That
 697          * extra refresh screwed the pooch.
 698          */
 699         if (gp->msgq.lh_first != NULL) {
 700                 if (!F_ISSET(sp, SC_SCR_VI) && vs_refresh(sp, 1))
 701                         return (1);
 702                 while ((mp = gp->msgq.lh_first) != NULL) {
 703                         gp->scr_msg(sp, mp->mtype, mp->buf, mp->len);
 704                         LIST_REMOVE(mp, q);
 705                         free(mp->buf);
 706                         free(mp);
 707                 }
 708                 F_SET(vip, VIP_CUR_INVALID);
 709         }
 710
 711         switch (vip->totalcount) {
 712         case 0:
 713                 redraw = 0;
 714                 break;
 715         case 1:
 716                 /*
 717                  * If we're switching screens, we have to wait for messages,
 718                  * regardless.  If we don't wait, skip updating the modeline.
 719                  */
 720                 if (forcewait)
 721                         vs_scroll(sp, NULL, SCROLL_W);
 722                 else
 723                         F_SET(vip, VIP_S_MODELINE);
 724
 725                 redraw = 0;
 726                 break;
 727         default:
 728                 /*
 729                  * If >1 message line in use, prompt the user to continue and
 730                  * repaint overwritten lines.
 731                  */
 732                 vs_scroll(sp, NULL, SCROLL_W);
 733
 734                 ev.e_event = E_REPAINT;
 735                 ev.e_flno = vip->totalcount >=
 736                     sp->rows ? 1 : sp->rows - vip->totalcount;
 737                 ev.e_tlno = sp->rows;
 738
 739                 redraw = 1;
 740                 break;
 741         }
 742
 743         /* Reset the count of overwriting lines. */
 744         vip->linecount = vip->lcontinue = vip->totalcount = 0;
 745
 746         /* Redraw. */
 747         if (redraw)
 748                 (void)v_erepaint(sp, &ev);
 749
 750         /* Restore the cursor position. */
 751         (void)gp->scr_move(csp, oldy, oldx);
 752
 753         return (0);
 754 }
 755
 756 /*
 757  * vs_scroll --
 758  *      Scroll the screen for output.
 759  */
 760 static void
 761 vs_scroll(sp, continuep, wtype)
 762         SCR *sp;
 763         int *continuep;
 764         sw_t wtype;
 765 {
 766         GS *gp;
 767         VI_PRIVATE *vip;
 768
 769         gp = sp->gp;
 770         vip = VIP(sp);
 771         if (!IS_ONELINE(sp)) {
 772                 /*
 773                  * Scroll the screen.  Instead of scrolling the entire screen,
 774                  * delete the line above the first line output so preserve the
 775                  * maximum amount of the screen.
 776                  */
 777                 (void)gp->scr_move(sp, vip->totalcount <
 778                     sp->rows ? LASTLINE(sp) - vip->totalcount : 0, 0);
 779                 (void)gp->scr_deleteln(sp);
 780
 781                 /* If there are screens below us, push them back into place. */
 782                 if (sp->q.cqe_next != (void *)&sp->gp->dq) {
 783                         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 784                         (void)gp->scr_insertln(sp);
 785                 }
 786         }
 787         if (wtype == SCROLL_W_QUIT && vip->linecount < sp->t_maxrows)
 788                 return;
 789         vs_wait(sp, continuep, wtype);
 790 }
 791
 792 /*
 793  * vs_wait --
 794  *      Prompt the user to continue.
 795  */
 796 static void
 797 vs_wait(sp, continuep, wtype)
 798         SCR *sp;
 799         int *continuep;
 800         sw_t wtype;
 801 {
 802         EVENT ev;
 803         VI_PRIVATE *vip;
 804         const char *p;
 805         GS *gp;
 806         size_t len;
 807
 808         gp = sp->gp;
 809         vip = VIP(sp);
 810
 811         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 812         if (IS_ONELINE(sp))
 813                 p = msg_cmsg(sp, CMSG_CONT_S, &len);
 814         else
 815                 switch (wtype) {
 816                 case SCROLL_W_QUIT:
 817                         p = msg_cmsg(sp, CMSG_CONT_Q, &len);
 818                         break;
 819                 case SCROLL_W_EX:
 820                         p = msg_cmsg(sp, CMSG_CONT_EX, &len);
 821                         break;
 822                 case SCROLL_W:
 823                         p = msg_cmsg(sp, CMSG_CONT, &len);
 824                         break;
 825                 default:
 826                         abort();
 827                         /* NOTREACHED */
 828                 }
 829         (void)gp->scr_addstr(sp, p, len);
 830
 831         ++vip->totalcount;
 832         vip->linecount = 0;
 833
 834         (void)gp->scr_clrtoeol(sp);
 835         (void)gp->scr_refresh(sp, 0);
 836
 837         /* Get a single character from the terminal. */
 838         if (continuep != NULL)
 839                 *continuep = 0;
 840         for (;;) {
 841                 if (v_event_get(sp, &ev, 0, 0))
 842                         return;
 843                 if (ev.e_event == E_CHARACTER)
 844                         break;
 845                 if (ev.e_event == E_INTERRUPT) {
 846                         ev.e_c = CH_QUIT;
 847                         F_SET(gp, G_INTERRUPTED);
 848                         break;
 849                 }
 850                 (void)gp->scr_bell(sp);
 851         }
 852         switch (wtype) {
 853         case SCROLL_W_QUIT:
 854                 if (ev.e_c == CH_QUIT)
 855                         F_SET(gp, G_INTERRUPTED);
 856                 break;
 857         case SCROLL_W_EX:
 858                 if (ev.e_c == ':' && continuep != NULL)
 859                         *continuep = 1;
 860                 break;
 861         case SCROLL_W:
 862                 break;
 863         }
 864 }
 865
 866 /*
 867  * vs_divider --
 868  *      Draw a dividing line between the screen and the output.
 869  */
 870 static void
 871 vs_divider(sp)
 872         SCR *sp;
 873 {
 874         GS *gp;
 875         size_t len;
 876
 877 #define DIVIDESTR       "+=+=+=+=+=+=+=+"
 878         len =
 879             sizeof(DIVIDESTR) - 1 > sp->cols ? sp->cols : sizeof(DIVIDESTR) - 1;
 880         gp = sp->gp;
 881         (void)gp->scr_attr(sp, SA_INVERSE, 1);
 882         (void)gp->scr_addstr(sp, DIVIDESTR, len);
 883         (void)gp->scr_attr(sp, SA_INVERSE, 0);
 884 }
 885
 886 /*
 887  * vs_msgsave --
 888  *      Save a message for later display.
 889  */
 890 static void
 891 vs_msgsave(sp, mt, p, len)
 892         SCR *sp;
 893         mtype_t mt;
 894         char *p;
 895         size_t len;
 896 {
 897         GS *gp;
 898         MSGS *mp_c, *mp_n;
 899
 900         /*
 901          * We have to handle messages before we have any place to put them.
 902          * If there's no screen support yet, allocate a msg structure, copy
 903          * in the message, and queue it on the global structure.  If we can't
 904          * allocate memory here, we're genuinely screwed, dump the message
 905          * to stderr in the (probably) vain hope that someone will see it.
 906          */
 907         CALLOC_GOTO(sp, mp_n, MSGS *, 1, sizeof(MSGS));
 908         MALLOC_GOTO(sp, mp_n->buf, char *, len);
 909
 910         memmove(mp_n->buf, p, len);
 911         mp_n->len = len;
 912         mp_n->mtype = mt;
 913
 914         gp = sp->gp;
 915         if ((mp_c = gp->msgq.lh_first) == NULL) {
 916                 LIST_INSERT_HEAD(&gp->msgq, mp_n, q);
 917         } else {
 918                 for (; mp_c->q.le_next != NULL; mp_c = mp_c->q.le_next);
 919                 LIST_INSERT_AFTER(mp_c, mp_n, q);
 920         }
 921         return;
 922
 923 alloc_err:
 924         if (mp_n != NULL)
 925                 free(mp_n);
 926         (void)fprintf(stderr, "%.*s\n", (int)len, p);
 927 }