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 10.83 2001/06/09 18:26:32 skimo Exp $ (Berkeley) $Date: 2001/06/09 18:26:32 $";
  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_T *));
 161  */
 162 void
 163 vs_update(SCR *sp, const char *m1, const CHAR_T *m2)
 164 {
 165         GS *gp;
 166         size_t len, mlen, oldx, oldy;
 167         CONST char *np;
 168         size_t nlen;
 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                 if (m2 != NULL)
 182                         INT2CHAR(sp, m2, STRLEN(m2) + 1, np, nlen);
 183                 (void)ex_printf(sp,
 184                     "%s\n", m1 == NULL? "" : m1, m2 == NULL ? "" : np);
 185                 (void)ex_fflush(sp);
 186         }
 187
 188         /*
 189          * Save the cursor position, the substitute-with-confirmation code
 190          * will have already set it correctly.
 191          */
 192         (void)gp->scr_cursor(sp, &oldy, &oldx);
 193
 194         /* Clear the bottom line. */
 195         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 196         (void)gp->scr_clrtoeol(sp);
 197
 198         /*
 199          * XXX
 200          * Don't let long file names screw up the screen.
 201          */
 202         if (m1 != NULL) {
 203                 mlen = len = strlen(m1);
 204                 if (len > sp->cols - 2)
 205                         mlen = len = sp->cols - 2;
 206                 (void)gp->scr_addstr(sp, m1, mlen);
 207         } else
 208                 len = 0;
 209         if (m2 != NULL) {
 210                 mlen = STRLEN(m2);
 211                 if (len + mlen > sp->cols - 2)
 212                         mlen = (sp->cols - 2) - len;
 213                 (void)gp->scr_waddstr(sp, m2, mlen);
 214         }
 215
 216         (void)gp->scr_move(sp, oldy, oldx);
 217         (void)gp->scr_refresh(sp, 0);
 218 }
 219
 220 /*
 221  * vs_msg --
 222  *      Display ex output or error messages for the screen.
 223  *
 224  * This routine is the default editor interface for all ex output, and all ex
 225  * and vi error/informational messages.  It implements the standard strategy
 226  * of stealing lines from the bottom of the vi text screen.  Screens using an
 227  * alternate method of displaying messages, e.g. dialog boxes, should set their
 228  * scr_msg function to the correct function before calling the editor.
 229  *
 230  * PUBLIC: void vs_msg __P((SCR *, mtype_t, char *, size_t));
 231  */
 232 void
 233 vs_msg(sp, mtype, line, len)
 234         SCR *sp;
 235         mtype_t mtype;
 236         char *line;
 237         size_t len;
 238 {
 239         GS *gp;
 240         VI_PRIVATE *vip;
 241         size_t maxcols, oldx, oldy, padding;
 242         const char *e, *s, *t;
 243
 244         gp = sp->gp;
 245         vip = VIP(sp);
 246
 247         /*
 248          * Ring the bell if it's scheduled.
 249          *
 250          * XXX
 251          * Shouldn't we save this, too?
 252          */
 253         if (F_ISSET(sp, SC_TINPUT_INFO) || F_ISSET(gp, G_BELLSCHED))
 254                 if (F_ISSET(sp, SC_SCR_VI)) {
 255                         F_CLR(gp, G_BELLSCHED);
 256                         (void)gp->scr_bell(sp);
 257                 } else
 258                         F_SET(gp, G_BELLSCHED);
 259
 260         /*
 261          * If vi is using the error line for text input, there's no screen
 262          * real-estate for the error message.  Nothing to do without some
 263          * information as to how important the error message is.
 264          */
 265         if (F_ISSET(sp, SC_TINPUT_INFO))
 266                 return;
 267
 268         /*
 269          * Ex or ex controlled screen output.
 270          *
 271          * If output happens during startup, e.g., a .exrc file, we may be
 272          * in ex mode but haven't initialized the screen.  Initialize here,
 273          * and in this case, stay in ex mode.
 274          *
 275          * If the SC_SCR_EXWROTE bit is set, then we're switching back and
 276          * forth between ex and vi, but the screen is trashed and we have
 277          * to respect that.  Switch to ex mode long enough to put out the
 278          * message.
 279          *
 280          * If the SC_EX_WAIT_NO bit is set, turn it off -- we're writing to
 281          * the screen, so previous opinions are ignored.
 282          */
 283         if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)) {
 284                 if (!F_ISSET(sp, SC_SCR_EX))
 285                         if (F_ISSET(sp, SC_SCR_EXWROTE)) {
 286                                 if (sp->gp->scr_screen(sp, SC_EX))
 287                                         return;
 288                         } else
 289                                 if (ex_init(sp))
 290                                         return;
 291
 292                 if (mtype == M_ERR)
 293                         (void)gp->scr_attr(sp, SA_INVERSE, 1);
 294                 (void)printf("%.*s", (int)len, line);
 295                 if (mtype == M_ERR)
 296                         (void)gp->scr_attr(sp, SA_INVERSE, 0);
 297                 (void)fflush(stdout);
 298
 299                 F_CLR(sp, SC_EX_WAIT_NO);
 300
 301                 if (!F_ISSET(sp, SC_SCR_EX))
 302                         (void)sp->gp->scr_screen(sp, SC_VI);
 303                 return;
 304         }
 305
 306         /* If the vi screen isn't ready, save the message. */
 307         if (!F_ISSET(sp, SC_SCR_VI)) {
 308                 (void)vs_msgsave(sp, mtype, line, len);
 309                 return;
 310         }
 311
 312         /* Save the cursor position. */
 313         (void)gp->scr_cursor(sp, &oldy, &oldx);
 314
 315         /* If it's an ex output message, just write it out. */
 316         if (mtype == M_NONE) {
 317                 vs_output(sp, mtype, line, len);
 318                 goto ret;
 319         }
 320
 321         /*
 322          * If it's a vi message, strip the trailing <newline> so we can
 323          * try and paste messages together.
 324          */
 325         if (line[len - 1] == '\n')
 326                 --len;
 327
 328         /*
 329          * If a message won't fit on a single line, try to split on a <blank>.
 330          * If a subsequent message fits on the same line, write a separator
 331          * and output it.  Otherwise, put out a newline.
 332          *
 333          * Need up to two padding characters normally; a semi-colon and a
 334          * separating space.  If only a single line on the screen, add some
 335          * more for the trailing continuation message.
 336          *
 337          * XXX
 338          * Assume that periods and semi-colons take up a single column on the
 339          * screen.
 340          *
 341          * XXX
 342          * There are almost certainly pathological cases that will break this
 343          * code.
 344          */
 345         if (IS_ONELINE(sp))
 346                 (void)msg_cmsg(sp, CMSG_CONT_S, &padding);
 347         else
 348                 padding = 0;
 349         padding += 2;
 350
 351         maxcols = sp->cols - 1;
 352         if (vip->lcontinue != 0)
 353                 if (len + vip->lcontinue + padding > maxcols)
 354                         vs_output(sp, vip->mtype, ".\n", 2);
 355                 else  {
 356                         vs_output(sp, vip->mtype, ";", 1);
 357                         vs_output(sp, M_NONE, " ", 1);
 358                 }
 359         vip->mtype = mtype;
 360         for (s = line;; s = t) {
 361                 for (; len > 0 && isblank(*s); --len, ++s);
 362                 if (len == 0)
 363                         break;
 364                 if (len + vip->lcontinue > maxcols) {
 365                         for (e = s + (maxcols - vip->lcontinue);
 366                             e > s && !isblank(*e); --e);
 367                         if (e == s)
 368                                  e = t = s + (maxcols - vip->lcontinue);
 369                         else
 370                                 for (t = e; isblank(e[-1]); --e);
 371                 } else
 372                         e = t = s + len;
 373
 374                 /*
 375                  * If the message ends in a period, discard it, we want to
 376                  * gang messages where possible.
 377                  */
 378                 len -= t - s;
 379                 if (len == 0 && (e - s) > 1 && s[(e - s) - 1] == '.')
 380                         --e;
 381                 vs_output(sp, mtype, s, e - s);
 382
 383                 if (len != 0)
 384                         vs_output(sp, M_NONE, "\n", 1);
 385
 386                 if (INTERRUPTED(sp))
 387                         break;
 388         }
 389
 390 ret:    (void)gp->scr_move(sp, oldy, oldx);
 391         (void)gp->scr_refresh(sp, 0);
 392 }
 393
 394 /*
 395  * vs_output --
 396  *      Output the text to the screen.
 397  */
 398 static void
 399 vs_output(sp, mtype, line, llen)
 400         SCR *sp;
 401         mtype_t mtype;
 402         const char *line;
 403         int llen;
 404 {
 405         char *kp;
 406         GS *gp;
 407         VI_PRIVATE *vip;
 408         size_t chlen, notused;
 409         int ch, len, rlen, tlen;
 410         const char *p, *t;
 411         char *cbp, *ecbp, cbuf[128];
 412
 413         gp = sp->gp;
 414         vip = VIP(sp);
 415         for (p = line, rlen = llen; llen > 0;) {
 416                 /* Get the next physical line. */
 417                 if ((p = memchr(line, '\n', llen)) == NULL)
 418                         len = llen;
 419                 else
 420                         len = p - line;
 421
 422                 /*
 423                  * The max is sp->cols characters, and we may have already
 424                  * written part of the line.
 425                  */
 426                 if (len + vip->lcontinue > sp->cols)
 427                         len = sp->cols - vip->lcontinue;
 428
 429                 /*
 430                  * If the first line output, do nothing.  If the second line
 431                  * output, draw the divider line.  If drew a full screen, we
 432                  * remove the divider line.  If it's a continuation line, move
 433                  * to the continuation point, else, move the screen up.
 434                  */
 435                 if (vip->lcontinue == 0) {
 436                         if (!IS_ONELINE(sp)) {
 437                                 if (vip->totalcount == 1) {
 438                                         (void)gp->scr_move(sp,
 439                                             LASTLINE(sp) - 1, 0);
 440                                         (void)gp->scr_clrtoeol(sp);
 441                                         (void)vs_divider(sp);
 442                                         F_SET(vip, VIP_DIVIDER);
 443                                         ++vip->totalcount;
 444                                         ++vip->linecount;
 445                                 }
 446                                 if (vip->totalcount == sp->t_maxrows &&
 447                                     F_ISSET(vip, VIP_DIVIDER)) {
 448                                         --vip->totalcount;
 449                                         --vip->linecount;
 450                                         F_CLR(vip, VIP_DIVIDER);
 451                                 }
 452                         }
 453                         if (vip->totalcount != 0)
 454                                 vs_scroll(sp, NULL, SCROLL_W_QUIT);
 455
 456                         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 457                         ++vip->totalcount;
 458                         ++vip->linecount;
 459
 460                         if (INTERRUPTED(sp))
 461                                 break;
 462                 } else
 463                         (void)gp->scr_move(sp, LASTLINE(sp), vip->lcontinue);
 464
 465                 /* Error messages are in inverse video. */
 466                 if (mtype == M_ERR)
 467                         (void)gp->scr_attr(sp, SA_INVERSE, 1);
 468
 469                 /* Display the line, doing character translation. */
 470 #define FLUSH {                                                         \
 471         *cbp = '\0';                                                    \
 472         (void)gp->scr_addstr(sp, cbuf, cbp - cbuf);                     \
 473         cbp = cbuf;                                                     \
 474 }
 475                 ecbp = (cbp = cbuf) + sizeof(cbuf) - 1;
 476                 for (t = line, tlen = len; tlen--; ++t) {
 477                         ch = *t;
 478                         /*
 479                          * Replace tabs with spaces, there are places in
 480                          * ex that do column calculations without looking
 481                          * at <tabs> -- and all routines that care about
 482                          * <tabs> do their own expansions.  This catches
 483                          * <tabs> in things like tag search strings.
 484                          */
 485                         if (ch == '\t')
 486                                 ch = ' ';
 487                         chlen = KEY_LEN(sp, ch);
 488                         if (cbp + chlen >= ecbp)
 489                                 FLUSH;
 490                         for (kp = KEY_NAME(sp, ch); chlen--;)
 491                                 *cbp++ = *kp++;
 492                 }
 493                 if (cbp > cbuf)
 494                         FLUSH;
 495                 if (mtype == M_ERR)
 496                         (void)gp->scr_attr(sp, SA_INVERSE, 0);
 497
 498                 /* Clear the rest of the line. */
 499                 (void)gp->scr_clrtoeol(sp);
 500
 501                 /* If we loop, it's a new line. */
 502                 vip->lcontinue = 0;
 503
 504                 /* Reset for the next line. */
 505                 line += len;
 506                 llen -= len;
 507                 if (p != NULL) {
 508                         ++line;
 509                         --llen;
 510                 }
 511         }
 512
 513         /* Set up next continuation line. */
 514         if (p == NULL)
 515                 gp->scr_cursor(sp, &notused, &vip->lcontinue);
 516 }
 517
 518 /*
 519  * vs_ex_resolve --
 520  *      Deal with ex message output.
 521  *
 522  * This routine is called when exiting a colon command to resolve any ex
 523  * output that may have occurred.
 524  *
 525  * PUBLIC: int vs_ex_resolve __P((SCR *, int *));
 526  */
 527 int
 528 vs_ex_resolve(sp, continuep)
 529         SCR *sp;
 530         int *continuep;
 531 {
 532         EVENT ev;
 533         GS *gp;
 534         VI_PRIVATE *vip;
 535         sw_t wtype;
 536
 537         gp = sp->gp;
 538         vip = VIP(sp);
 539         *continuep = 0;
 540
 541         /* If we ran any ex command, we can't trust the cursor position. */
 542         F_SET(vip, VIP_CUR_INVALID);
 543
 544         /* Terminate any partially written message. */
 545         if (vip->lcontinue != 0) {
 546                 vs_output(sp, vip->mtype, ".", 1);
 547                 vip->lcontinue = 0;
 548
 549                 vip->mtype = M_NONE;
 550         }
 551
 552         /*
 553          * If we switched out of the vi screen into ex, switch back while we
 554          * figure out what to do with the screen and potentially get another
 555          * command to execute.
 556          *
 557          * If we didn't switch into ex, we're not required to wait, and less
 558          * than 2 lines of output, we can continue without waiting for the
 559          * wait.
 560          *
 561          * Note, all other code paths require waiting, so we leave the report
 562          * of modified lines until later, so that we won't wait for no other
 563          * reason than a threshold number of lines were modified.  This means
 564          * we display cumulative line modification reports for groups of ex
 565          * commands.  That seems right to me (well, at least not wrong).
 566          */
 567         if (F_ISSET(sp, SC_SCR_EXWROTE)) {
 568                 if (sp->gp->scr_screen(sp, SC_VI))
 569                         return (1);
 570         } else
 571                 if (!F_ISSET(sp, SC_EX_WAIT_YES) && vip->totalcount < 2) {
 572                         F_CLR(sp, SC_EX_WAIT_NO);
 573                         return (0);
 574                 }
 575
 576         /* Clear the required wait flag, it's no longer needed. */
 577         F_CLR(sp, SC_EX_WAIT_YES);
 578
 579         /*
 580          * Wait, unless explicitly told not to wait or the user interrupted
 581          * the command.  If the user is leaving the screen, for any reason,
 582          * they can't continue with further ex commands.
 583          */
 584         if (!F_ISSET(sp, SC_EX_WAIT_NO) && !INTERRUPTED(sp)) {
 585                 wtype = F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE |
 586                     SC_FSWITCH | SC_SSWITCH) ? SCROLL_W : SCROLL_W_EX;
 587                 if (F_ISSET(sp, SC_SCR_EXWROTE))
 588                         vs_wait(sp, continuep, wtype);
 589                 else
 590                         vs_scroll(sp, continuep, wtype);
 591                 if (*continuep)
 592                         return (0);
 593         }
 594
 595         /* If ex wrote on the screen, refresh the screen image. */
 596         if (F_ISSET(sp, SC_SCR_EXWROTE))
 597                 F_SET(vip, VIP_N_EX_PAINT);
 598
 599         /*
 600          * If we're not the bottom of the split screen stack, the screen
 601          * image itself is wrong, so redraw everything.
 602          */
 603         if (sp->q.cqe_next != (void *)&sp->wp->scrq)
 604                 F_SET(sp, SC_SCR_REDRAW);
 605
 606         /* If ex changed the underlying file, the map itself is wrong. */
 607         if (F_ISSET(vip, VIP_N_EX_REDRAW))
 608                 F_SET(sp, SC_SCR_REFORMAT);
 609
 610         /* Ex may have switched out of the alternate screen, return. */
 611         (void)gp->scr_attr(sp, SA_ALTERNATE, 1);
 612
 613         /*
 614          * Whew.  We're finally back home, after what feels like years.
 615          * Kiss the ground.
 616          */
 617         F_CLR(sp, SC_SCR_EXWROTE | SC_EX_WAIT_NO);
 618
 619         /*
 620          * We may need to repaint some of the screen, e.g.:
 621          *
 622          *      :set
 623          *      :!ls
 624          *
 625          * gives us a combination of some lines that are "wrong", and a need
 626          * for a full refresh.
 627          */
 628         if (vip->totalcount > 1) {
 629                 /* Set up the redraw of the overwritten lines. */
 630                 ev.e_event = E_REPAINT;
 631                 ev.e_flno = vip->totalcount >=
 632                     sp->rows ? 1 : sp->rows - vip->totalcount;
 633                 ev.e_tlno = sp->rows;
 634
 635                 /* Reset the count of overwriting lines. */
 636                 vip->linecount = vip->lcontinue = vip->totalcount = 0;
 637
 638                 /* Redraw. */
 639                 (void)v_erepaint(sp, &ev);
 640         } else
 641                 /* Reset the count of overwriting lines. */
 642                 vip->linecount = vip->lcontinue = vip->totalcount = 0;
 643
 644         return (0);
 645 }
 646
 647 /*
 648  * vs_resolve --
 649  *      Deal with message output.
 650  *
 651  * PUBLIC: int vs_resolve __P((SCR *, SCR *, int));
 652  */
 653 int
 654 vs_resolve(sp, csp, forcewait)
 655         SCR *sp, *csp;
 656         int forcewait;
 657 {
 658         EVENT ev;
 659         GS *gp;
 660         MSGS *mp;
 661         VI_PRIVATE *vip;
 662         size_t oldy, oldx;
 663         int redraw;
 664
 665         /*
 666          * Vs_resolve is called from the main vi loop and the refresh function
 667          * to periodically ensure that the user has seen any messages that have
 668          * been displayed and that any status lines are correct.  The sp screen
 669          * is the screen we're checking, usually the current screen.  When it's
 670          * not, csp is the current screen, used for final cursor positioning.
 671          */
 672         gp = sp->gp;
 673         vip = VIP(sp);
 674         if (csp == NULL)
 675                 csp = sp;
 676
 677         /* Save the cursor position. */
 678         (void)gp->scr_cursor(csp, &oldy, &oldx);
 679
 680         /* Ring the bell if it's scheduled. */
 681         if (F_ISSET(gp, G_BELLSCHED)) {
 682                 F_CLR(gp, G_BELLSCHED);
 683                 (void)gp->scr_bell(sp);
 684         }
 685
 686         /* Display new file status line. */
 687         if (F_ISSET(sp, SC_STATUS)) {
 688                 F_CLR(sp, SC_STATUS);
 689                 msgq_status(sp, sp->lno, MSTAT_TRUNCATE);
 690         }
 691
 692         /* Report on line modifications. */
 693         mod_rpt(sp);
 694
 695         /*
 696          * Flush any saved messages.  If the screen isn't ready, refresh
 697          * it.  (A side-effect of screen refresh is that we can display
 698          * messages.)  Once this is done, don't trust the cursor.  That
 699          * extra refresh screwed the pooch.
 700          */
 701         if (gp->msgq.lh_first != NULL) {
 702                 if (!F_ISSET(sp, SC_SCR_VI) && vs_refresh(sp, 1))
 703                         return (1);
 704                 while ((mp = gp->msgq.lh_first) != NULL) {
 705                         gp->scr_msg(sp, mp->mtype, mp->buf, mp->len);
 706                         LIST_REMOVE(mp, q);
 707                         free(mp->buf);
 708                         free(mp);
 709                 }
 710                 F_SET(vip, VIP_CUR_INVALID);
 711         }
 712
 713         switch (vip->totalcount) {
 714         case 0:
 715                 redraw = 0;
 716                 break;
 717         case 1:
 718                 /*
 719                  * If we're switching screens, we have to wait for messages,
 720                  * regardless.  If we don't wait, skip updating the modeline.
 721                  */
 722                 if (forcewait)
 723                         vs_scroll(sp, NULL, SCROLL_W);
 724                 else
 725                         F_SET(vip, VIP_S_MODELINE);
 726
 727                 redraw = 0;
 728                 break;
 729         default:
 730                 /*
 731                  * If >1 message line in use, prompt the user to continue and
 732                  * repaint overwritten lines.
 733                  */
 734                 vs_scroll(sp, NULL, SCROLL_W);
 735
 736                 ev.e_event = E_REPAINT;
 737                 ev.e_flno = vip->totalcount >=
 738                     sp->rows ? 1 : sp->rows - vip->totalcount;
 739                 ev.e_tlno = sp->rows;
 740
 741                 redraw = 1;
 742                 break;
 743         }
 744
 745         /* Reset the count of overwriting lines. */
 746         vip->linecount = vip->lcontinue = vip->totalcount = 0;
 747
 748         /* Redraw. */
 749         if (redraw)
 750                 (void)v_erepaint(sp, &ev);
 751
 752         /* Restore the cursor position. */
 753         (void)gp->scr_move(csp, oldy, oldx);
 754
 755         return (0);
 756 }
 757
 758 /*
 759  * vs_scroll --
 760  *      Scroll the screen for output.
 761  */
 762 static void
 763 vs_scroll(sp, continuep, wtype)
 764         SCR *sp;
 765         int *continuep;
 766         sw_t wtype;
 767 {
 768         GS *gp;
 769         VI_PRIVATE *vip;
 770
 771         gp = sp->gp;
 772         vip = VIP(sp);
 773         if (!IS_ONELINE(sp)) {
 774                 /*
 775                  * Scroll the screen.  Instead of scrolling the entire screen,
 776                  * delete the line above the first line output so preserve the
 777                  * maximum amount of the screen.
 778                  */
 779                 (void)gp->scr_move(sp, vip->totalcount <
 780                     sp->rows ? LASTLINE(sp) - vip->totalcount : 0, 0);
 781                 (void)gp->scr_deleteln(sp);
 782
 783                 /* If there are screens below us, push them back into place. */
 784                 if (sp->q.cqe_next != (void *)&sp->wp->scrq) {
 785                         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 786                         (void)gp->scr_insertln(sp);
 787                 }
 788         }
 789         if (wtype == SCROLL_W_QUIT && vip->linecount < sp->t_maxrows)
 790                 return;
 791         vs_wait(sp, continuep, wtype);
 792 }
 793
 794 /*
 795  * vs_wait --
 796  *      Prompt the user to continue.
 797  */
 798 static void
 799 vs_wait(sp, continuep, wtype)
 800         SCR *sp;
 801         int *continuep;
 802         sw_t wtype;
 803 {
 804         EVENT ev;
 805         VI_PRIVATE *vip;
 806         const char *p;
 807         GS *gp;
 808         size_t len;
 809
 810         gp = sp->gp;
 811         vip = VIP(sp);
 812
 813         (void)gp->scr_move(sp, LASTLINE(sp), 0);
 814         if (IS_ONELINE(sp))
 815                 p = msg_cmsg(sp, CMSG_CONT_S, &len);
 816         else
 817                 switch (wtype) {
 818                 case SCROLL_W_QUIT:
 819                         p = msg_cmsg(sp, CMSG_CONT_Q, &len);
 820                         break;
 821                 case SCROLL_W_EX:
 822                         p = msg_cmsg(sp, CMSG_CONT_EX, &len);
 823                         break;
 824                 case SCROLL_W:
 825                         p = msg_cmsg(sp, CMSG_CONT, &len);
 826                         break;
 827                 default:
 828                         abort();
 829                         /* NOTREACHED */
 830                 }
 831         (void)gp->scr_addstr(sp, p, len);
 832
 833         ++vip->totalcount;
 834         vip->linecount = 0;
 835
 836         (void)gp->scr_clrtoeol(sp);
 837         (void)gp->scr_refresh(sp, 0);
 838
 839         /* Get a single character from the terminal. */
 840         if (continuep != NULL)
 841                 *continuep = 0;
 842         for (;;) {
 843                 if (v_event_get(sp, &ev, 0, 0))
 844                         return;
 845                 if (ev.e_event == E_CHARACTER)
 846                         break;
 847                 if (ev.e_event == E_INTERRUPT) {
 848                         ev.e_c = CH_QUIT;
 849                         F_SET(gp, G_INTERRUPTED);
 850                         break;
 851                 }
 852                 (void)gp->scr_bell(sp);
 853         }
 854         switch (wtype) {
 855         case SCROLL_W_QUIT:
 856                 if (ev.e_c == CH_QUIT)
 857                         F_SET(gp, G_INTERRUPTED);
 858                 break;
 859         case SCROLL_W_EX:
 860                 if (ev.e_c == ':' && continuep != NULL)
 861                         *continuep = 1;
 862                 break;
 863         case SCROLL_W:
 864                 break;
 865         }
 866 }
 867
 868 /*
 869  * vs_divider --
 870  *      Draw a dividing line between the screen and the output.
 871  */
 872 static void
 873 vs_divider(sp)
 874         SCR *sp;
 875 {
 876         GS *gp;
 877         size_t len;
 878
 879 #define DIVIDESTR       "+=+=+=+=+=+=+=+"
 880         len =
 881             sizeof(DIVIDESTR) - 1 > sp->cols ? sp->cols : sizeof(DIVIDESTR) - 1;
 882         gp = sp->gp;
 883         (void)gp->scr_attr(sp, SA_INVERSE, 1);
 884         (void)gp->scr_addstr(sp, DIVIDESTR, len);
 885         (void)gp->scr_attr(sp, SA_INVERSE, 0);
 886 }
 887
 888 /*
 889  * vs_msgsave --
 890  *      Save a message for later display.
 891  */
 892 static void
 893 vs_msgsave(sp, mt, p, len)
 894         SCR *sp;
 895         mtype_t mt;
 896         char *p;
 897         size_t len;
 898 {
 899         GS *gp;
 900         MSGS *mp_c, *mp_n;
 901
 902         /*
 903          * We have to handle messages before we have any place to put them.
 904          * If there's no screen support yet, allocate a msg structure, copy
 905          * in the message, and queue it on the global structure.  If we can't
 906          * allocate memory here, we're genuinely screwed, dump the message
 907          * to stderr in the (probably) vain hope that someone will see it.
 908          */
 909         CALLOC_GOTO(sp, mp_n, MSGS *, 1, sizeof(MSGS));
 910         MALLOC_GOTO(sp, mp_n->buf, char *, len);
 911
 912         memmove(mp_n->buf, p, len);
 913         mp_n->len = len;
 914         mp_n->mtype = mt;
 915
 916         gp = sp->gp;
 917         if ((mp_c = gp->msgq.lh_first) == NULL) {
 918                 LIST_INSERT_HEAD(&gp->msgq, mp_n, q);
 919         } else {
 920                 for (; mp_c->q.le_next != NULL; mp_c = mp_c->q.le_next);
 921                 LIST_INSERT_AFTER(mp_c, mp_n, q);
 922         }
 923         return;
 924
 925 alloc_err:
 926         if (mp_n != NULL)
 927                 free(mp_n);
 928         (void)fprintf(stderr, "%.*s\n", (int)len, p);
 929 }