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vi.c

/*-
 * Copyright (c) 1992, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *    Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)vi.c    10.57 (Berkeley) 10/13/96";
#endif /* not lint */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "../common/common.h"
#include "vi.h"
#include "vigor_extern.h"

typedef enum {
      GC_ERR, GC_ERR_NOFLUSH, GC_EVENT, GC_FATAL, GC_INTERRUPT, GC_OK
} gcret_t;

static VIKEYS const
             *v_alias __P((SCR *, VICMD *, VIKEYS const *));
static gcret_t    v_cmd __P((SCR *, VICMD *, VICMD *, VICMD *, int *, int *));
static int  v_count __P((SCR *, ARG_CHAR_T, u_long *));
static void v_dtoh __P((SCR *));
static int  v_init __P((SCR *));
static gcret_t    v_key __P((SCR *, int, EVENT *, u_int32_t));
static int  v_keyword __P((SCR *));
static int  v_motion __P((SCR *, VICMD *, VICMD *, int *));

#if defined(DEBUG) && defined(COMLOG)
static void v_comlog __P((SCR *, VICMD *));
#endif

/*
 * Side-effect:
 *    The dot structure can be set by the underlying vi functions,
 *    see v_Put() and v_put().
 */
#define     DOT         (&VIP(sp)->sdot)
#define     DOTMOTION   (&VIP(sp)->sdotmotion)

/*
 * vi --
 *    Main vi command loop.
 *
 * PUBLIC: int vi __P((SCR **));
 */
int
vi(spp)
      SCR **spp;
{
      GS *gp;
      MARK abs;
      SCR *next, *sp;
      VICMD cmd, *vp;
      VI_PRIVATE *vip;
      int comcount, mapped, rval;

      /* Get the first screen. */
      sp = *spp;
      gp = sp->gp;

      /* Initialize the command structure. */
      vp = &cmd;
      memset(vp, 0, sizeof(VICMD));

      /* Reset strange attraction. */
      F_SET(vp, VM_RCM_SET);

      /* Initialize vigor. */
      if (vigor_init(gp))
            return (1);

      /* Initialize the vi screen. */
      if (v_init(sp))
            return (1);

      /* Set the focus. */
      (void)sp->gp->scr_rename(sp, sp->frp->name, 1);

      for (vip = VIP(sp), rval = 0;;) {
            /* Resolve messages. */
            if (!MAPPED_KEYS_WAITING(sp) && vs_resolve(sp, NULL, 0))
                  goto ret;

            /*
             * If not skipping a refresh, return to command mode and
             * refresh the screen.
             */
            if (F_ISSET(vip, VIP_S_REFRESH))
                  F_CLR(vip, VIP_S_REFRESH);
            else {
                  sp->showmode = SM_COMMAND;
                  if (vs_refresh(sp, 0))
                        goto ret;
            }

            /* Set the new favorite position. */
            if (F_ISSET(vp, VM_RCM_SET | VM_RCM_SETFNB | VM_RCM_SETNNB)) {
                  F_CLR(vip, VIP_RCM_LAST);
                  (void)vs_column(sp, &sp->rcm);
            }

            /*
             * If not currently in a map, log the cursor position,
             * and set a flag so that this command can become the
             * DOT command.
             */
            if (MAPPED_KEYS_WAITING(sp))
                  mapped = 1;
            else {
                  if (log_cursor(sp))
                        goto err;
                  mapped = 0;
            }

            /*
             * There may be an ex command waiting, and we returned here
             * only because we exited a screen or file.  In this case,
             * we simply go back into the ex parser.
             */
            if (EXCMD_RUNNING(gp)) {
                  vp->kp = &vikeys[':'];
                  goto ex_continue;
            }

            /* Refresh the command structure. */
            memset(vp, 0, sizeof(VICMD));

            /*
             * We get a command, which may or may not have an associated
             * motion.  If it does, we get it too, calling its underlying
             * function to get the resulting mark.  We then call the
             * command setting the cursor to the resulting mark.
             *
             * !!!
             * Vi historically flushed mapped characters on error, but
             * entering extra <escape> characters at the beginning of
             * a map wasn't considered an error -- in fact, users would
             * put leading <escape> characters in maps to clean up vi
             * state before the map was interpreted.  Beauty!
             */
            switch (v_cmd(sp, DOT, vp, NULL, &comcount, &mapped)) {
            case GC_ERR:
                  goto err;
            case GC_ERR_NOFLUSH:
                  goto gc_err_noflush;
            case GC_EVENT:
                  if (v_event_exec(sp, vp))
                        goto err;
                  goto gc_event;
            case GC_FATAL:
                  goto ret;
            case GC_INTERRUPT:
                  goto intr;
            case GC_OK:
                  break;
            }

            /* Check for security setting. */
            if (F_ISSET(vp->kp, V_SECURE) && O_ISSET(sp, O_SECURE)) {
                  ex_emsg(sp, KEY_NAME(sp, vp->key), EXM_SECURE);
                  goto err;
            }

            /*
             * Historical practice: if a dot command gets a new count,
             * any motion component goes away, i.e. "d3w2." deletes a
             * total of 5 words.
             */
            if (F_ISSET(vp, VC_ISDOT) && comcount)
                  DOTMOTION->count = 1;

            /* Copy the key flags into the local structure. */
            F_SET(vp, vp->kp->flags);

            /* Prepare to set the previous context. */
            if (F_ISSET(vp, V_ABS | V_ABS_C | V_ABS_L)) {
                  abs.lno = sp->lno;
                  abs.cno = sp->cno;
            }

            /*
             * Set the three cursor locations to the current cursor.  The
             * underlying routines don't bother if the cursor doesn't move.
             * This also handles line commands (e.g. Y) defaulting to the
             * current line.
             */
            vp->m_start.lno = vp->m_stop.lno = vp->m_final.lno = sp->lno;
            vp->m_start.cno = vp->m_stop.cno = vp->m_final.cno = sp->cno;

            /*
             * Do any required motion; v_motion sets the from MARK and the
             * line mode flag, as well as the VM_RCM flags.
             */
            if (F_ISSET(vp, V_MOTION) &&
                v_motion(sp, DOTMOTION, vp, &mapped)) {
                  if (INTERRUPTED(sp))
                        goto intr;
                  goto err;
            }

            /*
             * If a count is set and the command is line oriented, set the
             * to MARK here relative to the cursor/from MARK.  This is for
             * commands that take both counts and motions, i.e. "4yy" and
             * "y%".  As there's no way the command can know which the user
             * did, we have to do it here.  (There are commands that are
             * line oriented and that take counts ("#G", "#H"), for which
             * this calculation is either completely meaningless or wrong.
             * Each command must validate the value for itself.
             */
            if (F_ISSET(vp, VC_C1SET) && F_ISSET(vp, VM_LMODE))
                  vp->m_stop.lno += vp->count - 1;

            /* Increment the command count. */
            ++sp->ccnt;

#if defined(DEBUG) && defined(COMLOG)
            v_comlog(sp, vp);
#endif
            /* Call the function. */
ex_continue:      if (vp->kp->func(sp, vp))
                  goto err;
gc_event:
#ifdef DEBUG
            /* Make sure no function left the temporary space locked. */
            if (F_ISSET(gp, G_TMP_INUSE)) {
                  F_CLR(gp, G_TMP_INUSE);
                  msgq(sp, M_ERR,
                      "232|vi: temporary buffer not released");
            }
#endif
            /*
             * If we're exiting this screen, move to the next one, or, if
             * there aren't any more, return to the main editor loop.  The
             * ordering is careful, don't discard the contents of sp until
             * the end.
             */
            if (F_ISSET(sp, SC_EXIT | SC_EXIT_FORCE)) {
                  if (file_end(sp, NULL, F_ISSET(sp, SC_EXIT_FORCE)))
                        goto ret;
                  if (vs_discard(sp, &next))
                        goto ret;
                  if (next == NULL && vs_swap(sp, &next, NULL))
                        goto ret;
                  *spp = next;
                  if (screen_end(sp))
                        goto ret;
                  if (next == NULL)
                        break;

                  /* Switch screens, change focus. */
                  sp = next;
                  vip = VIP(sp);
                  (void)sp->gp->scr_rename(sp, sp->frp->name, 1);

                  /* Don't trust the cursor. */
                  F_SET(vip, VIP_CUR_INVALID);

                  continue;
            }

            /*
             * Set the dot command structure.
             *
             * !!!
             * Historically, commands which used mapped keys did not
             * set the dot command, with the exception of the text
             * input commands.
             */
            if (F_ISSET(vp, V_DOT) && !mapped) {
                  *DOT = cmd;
                  F_SET(DOT, VC_ISDOT);

                  /*
                   * If a count was supplied for both the command and
                   * its motion, the count was used only for the motion.
                   * Turn the count back on for the dot structure.
                   */
                  if (F_ISSET(vp, VC_C1RESET))
                        F_SET(DOT, VC_C1SET);

                  /* VM flags aren't retained. */
                  F_CLR(DOT, VM_COMMASK | VM_RCM_MASK);
            }

            /*
             * Some vi row movements are "attracted" to the last position
             * set, i.e. the VM_RCM commands are moths to the VM_RCM_SET
             * commands' candle.  If the movement is to the EOL the vi
             * command handles it.  If it's to the beginning, we handle it
             * here.
             *
             * Note, some commands (e.g. _, ^) don't set the VM_RCM_SETFNB
             * flag, but do the work themselves.  The reason is that they
             * have to modify the column in case they're being used as a
             * motion component.  Other similar commands (e.g. +, -) don't
             * have to modify the column because they are always line mode
             * operations when used as motions, so the column number isn't
             * of any interest.
             *
             * Does this totally violate the screen and editor layering?
             * You betcha.  As they say, if you think you understand it,
             * you don't.
             */
            switch (F_ISSET(vp, VM_RCM_MASK)) {
            case 0:
            case VM_RCM_SET:
                  break;
            case VM_RCM:
                  vp->m_final.cno = vs_rcm(sp,
                      vp->m_final.lno, F_ISSET(vip, VIP_RCM_LAST));
                  break;
            case VM_RCM_SETLAST:
                  F_SET(vip, VIP_RCM_LAST);
                  break;
            case VM_RCM_SETFNB:
                  vp->m_final.cno = 0;
                  /* FALLTHROUGH */
            case VM_RCM_SETNNB:
                  if (nonblank(sp, vp->m_final.lno, &vp->m_final.cno))
                        goto err;
                  break;
            default:
                  abort();
            }

            /* Update the cursor. */
            sp->lno = vp->m_final.lno;
            sp->cno = vp->m_final.cno;

            /*
             * Set the absolute mark -- set even if a tags or similar
             * command, since the tag may be moving to the same file.
             */
            if ((F_ISSET(vp, V_ABS) ||
                F_ISSET(vp, V_ABS_L) && sp->lno != abs.lno ||
                F_ISSET(vp, V_ABS_C) &&
                (sp->lno != abs.lno || sp->cno != abs.cno)) &&
                mark_set(sp, ABSMARK1, &abs, 1))
                  goto err;

            if (0) {
err:              if (v_event_flush(sp, CH_MAPPED))
                        msgq(sp, M_BERR,
                      "110|Vi command failed: mapped keys discarded");
            }

            /*
             * Check and clear interrupts.  There's an obvious race, but
             * it's not worth fixing.
             */
gc_err_noflush:   if (INTERRUPTED(sp)) {
intr:             CLR_INTERRUPT(sp);
                  if (v_event_flush(sp, CH_MAPPED))
                        msgq(sp, M_ERR,
                            "231|Interrupted: mapped keys discarded");
                  else
                        msgq(sp, M_ERR, "236|Interrupted");
            }

            /* If the last command switched screens, update. */
            if (F_ISSET(sp, SC_SSWITCH)) {
                  F_CLR(sp, SC_SSWITCH);

                  /*
                   * If the current screen is still displayed, it will
                   * need a new status line.
                   */
                  F_SET(sp, SC_STATUS);

                  /* Switch screens, change focus. */
                  sp = sp->nextdisp;
                  vip = VIP(sp);
                  (void)sp->gp->scr_rename(sp, sp->frp->name, 1);

                  /* Don't trust the cursor. */
                  F_SET(vip, VIP_CUR_INVALID);

                  /* Refresh so we can display messages. */
                  if (vs_refresh(sp, 1))
                        return (1);
            }

            /* If the last command switched files, change focus. */
            if (F_ISSET(sp, SC_FSWITCH)) {
                  F_CLR(sp, SC_FSWITCH);
                  (void)sp->gp->scr_rename(sp, sp->frp->name, 1);
            }

            /* If leaving vi, return to the main editor loop. */
            if (F_ISSET(gp, G_SRESTART) || F_ISSET(sp, SC_EX)) {
                  *spp = sp;
                  v_dtoh(sp);
                  break;
            }
      }
      if (0)
ret:        rval = 1;
      return (rval);
}

#define     KEY(key, ec_flags) {                                  \
      if ((gcret = v_key(sp, 0, &ev, ec_flags)) != GC_OK)         \
            return (gcret);                                 \
      if (ev.e_value == K_ESCAPE)                           \
            goto esc;                                 \
      if (F_ISSET(&ev.e_ch, CH_MAPPED))                     \
            *mappedp = 1;                                   \
      key = ev.e_c;                                         \
}

/*
 * The O_TILDEOP option makes the ~ command take a motion instead
 * of a straight count.  This is the replacement structure we use
 * instead of the one currently in the VIKEYS table.
 *
 * XXX
 * This should probably be deleted -- it's not all that useful, and
 * we get help messages wrong.
 */
VIKEYS const tmotion = {
      v_mulcase,  V_CNT|V_DOT|V_MOTION|VM_RCM_SET,
      "[count]~[count]motion",
      " ~ change case to motion"
};

/*
 * v_cmd --
 *
 * The command structure for vi is less complex than ex (and don't think
 * I'm not grateful!)  The command syntax is:
 *
 *    [count] [buffer] [count] key [[motion] | [buffer] [character]]
 *
 * and there are several special cases.  The motion value is itself a vi
 * command, with the syntax:
 *
 *    [count] key [character]
 */
static gcret_t
v_cmd(sp, dp, vp, ismotion, comcountp, mappedp)
      SCR *sp;
      VICMD *dp, *vp;
      VICMD *ismotion;  /* Previous key if getting motion component. */
      int *comcountp, *mappedp;
{
      enum { COMMANDMODE, ISPARTIAL, NOTPARTIAL } cpart;
      EVENT ev;
      VIKEYS const *kp;
      gcret_t gcret;
      u_int flags;
      CHAR_T key;
      char *s;

      /*
       * Get a key.
       *
       * <escape> cancels partial commands, i.e. a command where at least
       * one non-numeric character has been entered.  Otherwise, it beeps
       * the terminal.
       *
       * !!!
       * POSIX 1003.2-1992 explicitly disallows cancelling commands where
       * all that's been entered is a number, requiring that the terminal
       * be alerted.
       */
      cpart = ismotion == NULL ? COMMANDMODE : ISPARTIAL;
      if ((gcret =
          v_key(sp, ismotion == NULL, &ev, EC_MAPCOMMAND)) != GC_OK) {
            if (gcret == GC_EVENT)
                  vp->ev = ev;
            return (gcret);
      }
      if (ev.e_value == K_ESCAPE)
            goto esc;
      if (F_ISSET(&ev.e_ch, CH_MAPPED))
            *mappedp = 1;
      key = ev.e_c;

      if (ismotion == NULL)
            cpart = NOTPARTIAL;

      /* Pick up optional buffer. */
      if (key == '"') {
            cpart = ISPARTIAL;
            if (ismotion != NULL) {
                  v_emsg(sp, NULL, VIM_COMBUF);
                  return (GC_ERR);
            }
            KEY(vp->buffer, 0);
            F_SET(vp, VC_BUFFER);

            KEY(key, EC_MAPCOMMAND);
      }

      /*
       * Pick up optional count, where a leading 0 is not a count,
       * it's a command.
       */
      if (isdigit(key) && key != '0') {
            if (v_count(sp, key, &vp->count))
                  return (GC_ERR);
            F_SET(vp, VC_C1SET);
            *comcountp = 1;

            KEY(key, EC_MAPCOMMAND);
      } else
            *comcountp = 0;

      /* Pick up optional buffer. */
      if (key == '"') {
            cpart = ISPARTIAL;
            if (F_ISSET(vp, VC_BUFFER)) {
                  msgq(sp, M_ERR, "234|Only one buffer may be specified");
                  return (GC_ERR);
            }
            if (ismotion != NULL) {
                  v_emsg(sp, NULL, VIM_COMBUF);
                  return (GC_ERR);
            }
            KEY(vp->buffer, 0);
            F_SET(vp, VC_BUFFER);

            KEY(key, EC_MAPCOMMAND);
      }

      /* Check for an OOB command key. */
      cpart = ISPARTIAL;
      if (key > MAXVIKEY) {
            v_emsg(sp, KEY_NAME(sp, key), VIM_NOCOM);
            return (GC_ERR);
      }
      kp = &vikeys[vp->key = key];

      /*
       * !!!
       * Historically, D accepted and then ignored a count.  Match it.
       */
      if (vp->key == 'D' && F_ISSET(vp, VC_C1SET)) {
            *comcountp = 0;
            vp->count = 0;
            F_CLR(vp, VC_C1SET);
      }

      /* Check for command aliases. */
      if (kp->func == NULL && (kp = v_alias(sp, vp, kp)) == NULL)
            return (GC_ERR);

      /* The tildeop option makes the ~ command take a motion. */
      if (key == '~' && O_ISSET(sp, O_TILDEOP))
            kp = &tmotion;

      vp->kp = kp;

      /*
       * Find the command.  The only legal command with no underlying
       * function is dot.  It's historic practice that <escape> doesn't
       * just erase the preceding number, it beeps the terminal as well.
       * It's a common problem, so just beep the terminal unless verbose
       * was set.
       */
      if (kp->func == NULL) {
            if (key != '.') {
                  v_emsg(sp, KEY_NAME(sp, key),
                      ev.e_value == K_ESCAPE ? VIM_NOCOM_B : VIM_NOCOM);
                  return (GC_ERR);
            }

            /* If called for a motion command, stop now. */
            if (dp == NULL)
                  goto usage;

            /*
             * !!!
             * If a '.' is immediately entered after an undo command, we
             * replay the log instead of redoing the last command.  This
             * is necessary because 'u' can't set the dot command -- see
             * vi/v_undo.c:v_undo for details.
             */
            if (VIP(sp)->u_ccnt == sp->ccnt) {
                  vp->kp = &vikeys['u'];
                  F_SET(vp, VC_ISDOT);
                  return (GC_OK);
            }

            /* Otherwise, a repeatable command must have been executed. */
            if (!F_ISSET(dp, VC_ISDOT)) {
                  msgq(sp, M_ERR, "208|No command to repeat");
                  return (GC_ERR);
            }

            /* Set new count/buffer, if any, and return. */
            if (F_ISSET(vp, VC_C1SET)) {
                  F_SET(dp, VC_C1SET);
                  dp->count = vp->count;
            }
            if (F_ISSET(vp, VC_BUFFER))
                  dp->buffer = vp->buffer;

            *vp = *dp;
            return (GC_OK);
      }

      /* Set the flags based on the command flags. */
      flags = kp->flags;

      /* Check for illegal count. */
      if (F_ISSET(vp, VC_C1SET) && !LF_ISSET(V_CNT))
            goto usage;

      /* Illegal motion command. */
      if (ismotion == NULL) {
            /* Illegal buffer. */
            if (!LF_ISSET(V_OBUF) && F_ISSET(vp, VC_BUFFER))
                  goto usage;

            /* Required buffer. */
            if (LF_ISSET(V_RBUF)) {
                  KEY(vp->buffer, 0);
                  F_SET(vp, VC_BUFFER);
            }
      }

      /*
       * Special case: '[', ']' and 'Z' commands.  Doesn't the fact that
       * the *single* characters don't mean anything but the *doubled*
       * characters do, just frost your shorts?
       */
      if (vp->key == '[' || vp->key == ']' || vp->key == 'Z') {
            /*
             * Historically, half entered [[, ]] or Z commands weren't
             * cancelled by <escape>, the terminal was beeped instead.
             * POSIX.2-1992 probably didn't notice, and requires that
             * they be cancelled instead of beeping.  Seems fine to me.
             *
             * Don't set the EC_MAPCOMMAND flag, apparently ] is a popular
             * vi meta-character, and we don't want the user to wait while
             * we time out a possible mapping.  This *appears* to match
             * historic vi practice, but with mapping characters, you Just
             * Never Know.
             */
            KEY(key, 0);

            if (vp->key != key) {
usage:                  if (ismotion == NULL)
                        s = kp->usage;
                  else if (ismotion->key == '~' && O_ISSET(sp, O_TILDEOP))
                        s = tmotion.usage;
                  else
                        s = vikeys[ismotion->key].usage;
                  v_emsg(sp, s, VIM_USAGE);
                  return (GC_ERR);
            }
      }
      /* Special case: 'z' command. */
      if (vp->key == 'z') {
            KEY(vp->character, 0);
            if (isdigit(vp->character)) {
                  if (v_count(sp, vp->character, &vp->count2))
                        return (GC_ERR);
                  F_SET(vp, VC_C2SET);
                  KEY(vp->character, 0);
            }
      }

      /*
       * Commands that have motion components can be doubled to
       * imply the current line.
       */
      if (ismotion != NULL && ismotion->key != key && !LF_ISSET(V_MOVE)) {
            msgq(sp, M_ERR, "210|%s may not be used as a motion command",
                KEY_NAME(sp, key));
            return (GC_ERR);
      }

      /* Required character. */
      if (LF_ISSET(V_CHAR))
            KEY(vp->character, 0);

      /* Get any associated cursor word. */
      if (F_ISSET(kp, V_KEYW) && v_keyword(sp))
            return (GC_ERR);

      return (GC_OK);

esc:  switch (cpart) {
      case COMMANDMODE:
            msgq(sp, M_BERR, "211|Already in command mode");
            return (GC_ERR_NOFLUSH);
      case ISPARTIAL:
            break;
      case NOTPARTIAL:
            (void)sp->gp->scr_bell(sp);
            break;
      }
      return (GC_ERR);
}

/*
 * v_motion --
 *
 * Get resulting motion mark.
 */
static int
v_motion(sp, dm, vp, mappedp)
      SCR *sp;
      VICMD *dm, *vp;
      int *mappedp;
{
      VICMD motion;
      size_t len;
      u_long cnt;
      u_int flags;
      int tilde_reset, notused;

      /*
       * If '.' command, use the dot motion, else get the motion command.
       * Clear any line motion flags, the subsequent motion isn't always
       * the same, i.e. "/aaa" may or may not be a line motion.
       */
      if (F_ISSET(vp, VC_ISDOT)) {
            motion = *dm;
            F_SET(&motion, VC_ISDOT);
            F_CLR(&motion, VM_COMMASK);
      } else {
            memset(&motion, 0, sizeof(VICMD));
            if (v_cmd(sp, NULL, &motion, vp, &notused, mappedp) != GC_OK)
                  return (1);
      }

      /*
       * A count may be provided both to the command and to the motion, in
       * which case the count is multiplicative.  For example, "3y4y" is the
       * same as "12yy".  This count is provided to the motion command and
       * not to the regular function.
       */
      cnt = motion.count = F_ISSET(&motion, VC_C1SET) ? motion.count : 1;
      if (F_ISSET(vp, VC_C1SET)) {
            motion.count *= vp->count;
            F_SET(&motion, VC_C1SET);

            /*
             * Set flags to restore the original values of the command
             * structure so dot commands can change the count values,
             * e.g. "2dw" "3." deletes a total of five words.
             */
            F_CLR(vp, VC_C1SET);
            F_SET(vp, VC_C1RESET);
      }

      /*
       * Some commands can be repeated to indicate the current line.  In
       * this case, or if the command is a "line command", set the flags
       * appropriately.  If not a doubled command, run the function to get
       * the resulting mark.
       */
      if (vp->key == motion.key) {
            F_SET(vp, VM_LDOUBLE | VM_LMODE);

            /* Set the origin of the command. */
            vp->m_start.lno = sp->lno;
            vp->m_start.cno = 0;

            /*
             * Set the end of the command.
             *
             * If the current line is missing, i.e. the file is empty,
             * historic vi permitted a "cc" or "!!" command to insert
             * text.
             */
            vp->m_stop.lno = sp->lno + motion.count - 1;
            if (db_get(sp, vp->m_stop.lno, 0, NULL, &len)) {
                  if (vp->m_stop.lno != 1 ||
                     vp->key != 'c' && vp->key != '!') {
                        v_emsg(sp, NULL, VIM_EMPTY);
                        return (1);
                  }
                  vp->m_stop.cno = 0;
            } else
                  vp->m_stop.cno = len ? len - 1 : 0;
      } else {
            /*
             * Motion commands change the underlying movement (*snarl*).
             * For example, "l" is illegal at the end of a line, but "dl"
             * is not.  Set flags so the function knows the situation.
             */
            motion.rkp = vp->kp;

            /*
             * XXX
             * Use yank instead of creating a new motion command, it's a
             * lot easier for now.
             */
            if (vp->kp == &tmotion) {
                  tilde_reset = 1;
                  vp->kp = &vikeys['y'];
            } else
                  tilde_reset = 0;

            /*
             * Copy the key flags into the local structure, except for the
             * RCM flags -- the motion command will set the RCM flags in
             * the vp structure if necessary.  This means that the motion
             * command is expected to determine where the cursor ends up!
             * However, we save off the current RCM mask and restore it if
             * it no RCM flags are set by the motion command, with a small
             * modification.
             *
             * We replace the VM_RCM_SET flag with the VM_RCM flag.  This
             * is so that cursor movement doesn't set the relative position
             * unless the motion command explicitly specified it.  This
             * appears to match historic practice, but I've never been able
             * to develop a hard-and-fast rule.
             */
            flags = F_ISSET(vp, VM_RCM_MASK);
            if (LF_ISSET(VM_RCM_SET)) {
                  LF_SET(VM_RCM);
                  LF_CLR(VM_RCM_SET);
            }
            F_CLR(vp, VM_RCM_MASK);
            F_SET(&motion, motion.kp->flags & ~VM_RCM_MASK);

            /*
             * Set the three cursor locations to the current cursor.  This
             * permits commands like 'j' and 'k', that are line oriented
             * motions and have special cursor suck semantics when they are
             * used as standalone commands, to ignore column positioning.
             */
            motion.m_final.lno =
                motion.m_stop.lno = motion.m_start.lno = sp->lno;
            motion.m_final.cno =
                motion.m_stop.cno = motion.m_start.cno = sp->cno;

            /* Run the function. */
            if ((motion.kp->func)(sp, &motion))
                  return (1);

            /*
             * If the current line is missing, i.e. the file is empty,
             * historic vi allowed "c<motion>" or "!<motion>" to insert
             * text.  Otherwise fail -- most motion commands will have
             * already failed, but some, e.g. G, succeed in empty files.
             */
            if (!db_exist(sp, vp->m_stop.lno)) {
                  if (vp->m_stop.lno != 1 ||
                     vp->key != 'c' && vp->key != '!') {
                        v_emsg(sp, NULL, VIM_EMPTY);
                        return (1);
                  }
                  vp->m_stop.cno = 0;
            }

            /*
             * XXX
             * See above.
             */
            if (tilde_reset)
                  vp->kp = &tmotion;

            /*
             * Copy cut buffer, line mode and cursor position information
             * from the motion command structure, i.e. anything that the
             * motion command can set for us.  The commands can flag the
             * movement as a line motion (see v_sentence) as well as set
             * the VM_RCM_* flags explicitly.
             */
            F_SET(vp, F_ISSET(&motion, VM_COMMASK | VM_RCM_MASK));

            /*
             * If the motion command set no relative motion flags, use
             * the (slightly) modified previous values.
             */
            if (!F_ISSET(vp, VM_RCM_MASK))
                  F_SET(vp, flags);

            /*
             * Commands can change behaviors based on the motion command
             * used, for example, the ! command repeated the last bang
             * command if N or n was used as the motion.
             */
            vp->rkp = motion.kp;

            /*
             * Motion commands can reset all of the cursor information.
             * If the motion is in the reverse direction, switch the
             * from and to MARK's so that it's in a forward direction.
             * Motions are from the from MARK to the to MARK (inclusive).
             */
            if (motion.m_start.lno > motion.m_stop.lno ||
                motion.m_start.lno == motion.m_stop.lno &&
                motion.m_start.cno > motion.m_stop.cno) {
                  vp->m_start = motion.m_stop;
                  vp->m_stop = motion.m_start;
            } else {
                  vp->m_start = motion.m_start;
                  vp->m_stop = motion.m_stop;
            }
            vp->m_final = motion.m_final;
      }

      /*
       * If the command sets dot, save the motion structure.  The motion
       * count was changed above and needs to be reset, that's why this
       * is done here, and not in the calling routine.
       */
      if (F_ISSET(vp->kp, V_DOT)) {
            *dm = motion;
            dm->count = cnt;
      }
      return (0);
}

/*
 * v_init --
 *    Initialize the vi screen.
 */
static int
v_init(sp)
      SCR *sp;
{
      GS *gp;
      VI_PRIVATE *vip;

      gp = sp->gp;
      vip = VIP(sp);

      /* Switch into vi. */
      if (gp->scr_screen(sp, SC_VI))
            return (1);
      (void)gp->scr_attr(sp, SA_ALTERNATE, 1);

      F_CLR(sp, SC_EX | SC_SCR_EX);
      F_SET(sp, SC_VI);

      /*
       * Initialize screen values.
       *
       * Small windows: see vs_refresh(), section 6a.
       *
       * Setup:
       *    t_minrows is the minimum rows to display
       *    t_maxrows is the maximum rows to display (rows - 1)
       *    t_rows is the rows currently being displayed
       */
      sp->rows = vip->srows = O_VAL(sp, O_LINES);
      sp->cols = O_VAL(sp, O_COLUMNS);
      sp->t_rows = sp->t_minrows = O_VAL(sp, O_WINDOW);
      if (sp->rows != 1) {
            if (sp->t_rows > sp->rows - 1) {
                  sp->t_minrows = sp->t_rows = sp->rows - 1;
                  msgq(sp, M_INFO,
                      "214|Windows option value is too large, max is %u",
                      sp->t_rows);
            }
            sp->t_maxrows = sp->rows - 1;
      } else
            sp->t_maxrows = 1;
      sp->woff = 0;

      /* Create a screen map. */
      CALLOC_RET(sp, HMAP, SMAP *, SIZE_HMAP(sp), sizeof(SMAP));
      TMAP = HMAP + (sp->t_rows - 1);
      HMAP->lno = sp->lno;
      HMAP->coff = 0;
      HMAP->soff = 1;

      /*
       * Fill the screen map from scratch -- try and center the line.  That
       * way if we're starting with a file we've seen before, we'll put the
       * line in the middle, otherwise, it won't work and we'll end up with
       * the line at the top.
       */
      F_SET(sp, SC_SCR_REFORMAT | SC_SCR_CENTER);

      /* Invalidate the cursor. */
      F_SET(vip, VIP_CUR_INVALID);

      /* Paint the screen image from scratch. */
      F_SET(vip, VIP_N_EX_PAINT);

      return (0);
}

/*
 * v_dtoh --
 *    Move all but the current screen to the hidden queue.
 */
static void
v_dtoh(sp)
      SCR *sp;
{
      GS *gp;
      SCR *tsp;
      int hidden;

      /* Move all screens to the hidden queue, tossing screen maps. */
      for (hidden = 0, gp = sp->gp;
          (tsp = gp->dq.cqh_first) != (void *)&gp->dq; ++hidden) {
            if (_HMAP(tsp) != NULL) {
                  free(_HMAP(tsp));
                  _HMAP(tsp) = NULL;
            }
            CIRCLEQ_REMOVE(&gp->dq, tsp, q);
            CIRCLEQ_INSERT_TAIL(&gp->hq, tsp, q);
      }

      /* Move current screen back to the display queue. */
      CIRCLEQ_REMOVE(&gp->hq, sp, q);
      CIRCLEQ_INSERT_TAIL(&gp->dq, sp, q);

      /*
       * XXX
       * Don't bother internationalizing this message, it's going to
       * go away as soon as we have one-line screens.  --TK
       */
      if (hidden > 1)
            msgq(sp, M_INFO,
                "%d screens backgrounded; use :display to list them",
                hidden - 1);
}

/*
 * v_keyword --
 *    Get the word (or non-word) the cursor is on.
 */
static int
v_keyword(sp)
      SCR *sp;
{
      VI_PRIVATE *vip;
      size_t beg, end, len;
      int moved, state;
      char *p;

      if (db_get(sp, sp->lno, DBG_FATAL, &p, &len))
            return (1);

      /*
       * !!!
       * Historically, tag commands skipped over any leading whitespace
       * characters.  Make this true in general when using cursor words.
       * If movement, getting a cursor word implies moving the cursor to
       * its beginning.  Refresh now.
       *
       * !!!
       * Find the beginning/end of the keyword.  Keywords are currently
       * used for cursor-word searching and for tags.  Historical vi
       * only used the word in a tag search from the cursor to the end
       * of the word, i.e. if the cursor was on the 'b' in " abc ", the
       * tag was "bc".  For consistency, we make cursor word searches
       * follow the same rule.
       */
      for (moved = 0,
          beg = sp->cno; beg < len && isspace(p[beg]); moved = 1, ++beg);
      if (beg >= len) {
            msgq(sp, M_BERR, "212|Cursor not in a word");
            return (1);
      }
      if (moved) {
            sp->cno = beg;
            (void)vs_refresh(sp, 0);
      }

      /* Find the end of the word. */
      for (state = inword(p[beg]),
          end = beg; ++end < len && state == inword(p[end]););

      vip = VIP(sp);
      len = (end - beg);
      BINC_RET(sp, vip->keyw, vip->klen, len);
      memmove(vip->keyw, p + beg, len);
      vip->keyw[len] = '\0';                    /* XXX */
      return (0);
}

/*
 * v_alias --
 *    Check for a command alias.
 */
static VIKEYS const *
v_alias(sp, vp, kp)
      SCR *sp;
      VICMD *vp;
      VIKEYS const *kp;
{
      CHAR_T push;

      switch (vp->key) {
      case 'C':               /* C -> c$ */
            push = '$';
            vp->key = 'c';
            break;
      case 'D':               /* D -> d$ */
            push = '$';
            vp->key = 'd';
            break;
      case 'S':               /* S -> c_ */
            push = '_';
            vp->key = 'c';
            break;
      case 'Y':               /* Y -> y_ */
            push = '_';
            vp->key = 'y';
            break;
      default:
            return (kp);
      }
      return (v_event_push(sp,
          NULL, &push, 1, CH_NOMAP | CH_QUOTED) ? NULL : &vikeys[vp->key]);
}

/*
 * v_count --
 *    Return the next count.
 */
static int
v_count(sp, fkey, countp)
      SCR *sp;
      ARG_CHAR_T fkey;
      u_long *countp;
{
      EVENT ev;
      u_long count, tc;

      ev.e_c = fkey;
      count = tc = 0;
      do {
            /*
             * XXX
             * Assume that overflow results in a smaller number.
             */
            tc = count * 10 + ev.e_c - '0';
            if (count > tc) {
                  /* Toss to the next non-digit. */
                  do {
                        if (v_key(sp, 0, &ev,
                            EC_MAPCOMMAND | EC_MAPNODIGIT) != GC_OK)
                              return (1);
                  } while (isdigit(ev.e_c));
                  msgq(sp, M_ERR,
                      "235|Number larger than %lu", ULONG_MAX);
                  return (1);
            }
            count = tc;
            if (v_key(sp, 0, &ev, EC_MAPCOMMAND | EC_MAPNODIGIT) != GC_OK)
                  return (1);
      } while (isdigit(ev.e_c));
      *countp = count;
      return (0);
}

/*
 * v_key --
 *    Return the next event.
 */
static gcret_t
v_key(sp, command_events, evp, ec_flags)
      SCR *sp;
      int command_events;
      EVENT *evp;
      u_int32_t ec_flags;
{
      u_int32_t quote;

      for (quote = 0;;) {
            if (v_event_get(sp, evp, 0, ec_flags | quote))
                  return (GC_FATAL);
            quote = 0;

            switch (evp->e_event) {
            case E_CHARACTER:
                  /*
                   * !!!
                   * Historically, ^V was ignored in the command stream,
                   * although it had a useful side-effect of interrupting
                   * mappings.  Adding a quoting bit to the call probably
                   * extends historic practice, but it feels right.
                   */
                  if (evp->e_value == K_VLNEXT) {
                        quote = EC_QUOTED;
                        break;
                  }
                  return (GC_OK);
            case E_ERR:
            case E_EOF:
                  return (GC_FATAL);
            case E_INTERRUPT:
                  /*
                   * !!!
                   * Historically, vi beeped on command level interrupts.
                   *
                   * Historically, vi exited to ex mode if no file was
                   * named on the command line, and two interrupts were
                   * generated in a row.  (Just figured you might want
                   * to know that.)
                   */
                  (void)sp->gp->scr_bell(sp);
                  return (GC_INTERRUPT);
            case E_REPAINT:
                  if (vs_repaint(sp, evp))
                        return (GC_FATAL);
                  break;
            case E_WRESIZE:
                  return (GC_ERR);
            case E_QUIT:
            case E_WRITE:
                  if (command_events)
                        return (GC_EVENT);
                  /* FALLTHROUGH */
            default:
                  v_event_err(sp, evp);
                  return (GC_ERR);
            }
      }
      /* NOTREACHED */
}

#if defined(DEBUG) && defined(COMLOG)
/*
 * v_comlog --
 *    Log the contents of the command structure.
 */
static void
v_comlog(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      TRACE(sp, "vcmd: %c", vp->key);
      if (F_ISSET(vp, VC_BUFFER))
            TRACE(sp, " buffer: %c", vp->buffer);
      if (F_ISSET(vp, VC_C1SET))
            TRACE(sp, " c1: %lu", vp->count);
      if (F_ISSET(vp, VC_C2SET))
            TRACE(sp, " c2: %lu", vp->count2);
      TRACE(sp, " flags: 0x%x\n", vp->flags);
}
#endif

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