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v_itxt.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[] = "@(#)v_itxt.c      10.16 (Berkeley) 10/23/96";
#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 "../common/common.h"
#include "vi.h"

/*
 * !!!
 * Repeated input in the historic vi is mostly wrong and this isn't very
 * backward compatible.  For example, if the user entered "3Aab\ncd" in
 * the historic vi, the "ab" was repeated 3 times, and the "\ncd" was then
 * appended to the result.  There was also a hack which I don't remember
 * right now, where "3o" would open 3 lines and then let the user fill them
 * in, to make screen movements on 300 baud modems more tolerable.  I don't
 * think it's going to be missed.
 *
 * !!!
 * There's a problem with the way that we do logging for change commands with
 * implied motions (e.g. A, I, O, cc, etc.).  Since the main vi loop logs the
 * starting cursor position before the change command "moves" the cursor, the
 * cursor position to which we return on undo will be where the user entered
 * the change command, not the start of the change.  Several of the following
 * routines re-log the cursor to make this work correctly.  Historic vi tried
 * to do the same thing, and mostly got it right.  (The only spectacular way
 * it fails is if the user entered 'o' from anywhere but the last character of
 * the line, the undo returned the cursor to the start of the line.  If the
 * user was on the last character of the line, the cursor returned to that
 * position.)  We also check for mapped keys waiting, i.e. if we're in the
 * middle of a map, don't bother logging the cursor.
 */
#define     LOG_CORRECT {                                         \
      if (!MAPPED_KEYS_WAITING(sp))                         \
            (void)log_cursor(sp);                           \
}

static u_int32_t set_txt_std __P((SCR *, VICMD *, u_int32_t));

/*
 * v_iA -- [count]A
 *    Append text to the end of the line.
 *
 * PUBLIC: int v_iA __P((SCR *, VICMD *));
 */
int
v_iA(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t len;

      if (!db_get(sp, vp->m_start.lno, 0, NULL, &len))
            sp->cno = len == 0 ? 0 : len - 1;

      LOG_CORRECT;

      return (v_ia(sp, vp));
}

/*
 * v_ia -- [count]a
 *       [count]A
 *    Append text to the cursor position.
 *
 * PUBLIC: int v_ia __P((SCR *, VICMD *));
 */
int
v_ia(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t len;
      u_int32_t flags;
      int isempty;
      char *p;

      flags = set_txt_std(sp, vp, 0);
      sp->showmode = SM_APPEND;
      sp->lno = vp->m_start.lno;

      /* Move the cursor one column to the right and repaint the screen. */
      if (db_eget(sp, sp->lno, &p, &len, &isempty)) {
            if (!isempty)
                  return (1);
            len = 0;
            LF_SET(TXT_APPENDEOL);
      } else if (len) {
            if (len == sp->cno + 1) {
                  sp->cno = len;
                  LF_SET(TXT_APPENDEOL);
            } else
                  ++sp->cno;
      } else
            LF_SET(TXT_APPENDEOL);

      return (v_txt(sp, vp, NULL, p, len,
          0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}

/*
 * v_iI -- [count]I
 *    Insert text at the first nonblank.
 *
 * PUBLIC: int v_iI __P((SCR *, VICMD *));
 */
int
v_iI(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      sp->cno = 0;
      if (nonblank(sp, vp->m_start.lno, &sp->cno))
            return (1);

      LOG_CORRECT;

      return (v_ii(sp, vp));
}

/*
 * v_ii -- [count]i
 *       [count]I
 *    Insert text at the cursor position.
 *
 * PUBLIC: int v_ii __P((SCR *, VICMD *));
 */
int
v_ii(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t len;
      u_int32_t flags;
      int isempty;
      char *p;

      flags = set_txt_std(sp, vp, 0);
      sp->showmode = SM_INSERT;
      sp->lno = vp->m_start.lno;

      if (db_eget(sp, sp->lno, &p, &len, &isempty)) {
            if (!isempty)
                  return (1);
            len = 0;
      }

      if (len == 0)
            LF_SET(TXT_APPENDEOL);
      return (v_txt(sp, vp, NULL, p, len,
          0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}

enum which { o_cmd, O_cmd };
static int io __P((SCR *, VICMD *, enum which));

/*
 * v_iO -- [count]O
 *    Insert text above this line.
 *
 * PUBLIC: int v_iO __P((SCR *, VICMD *));
 */
int
v_iO(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      return (io(sp, vp, O_cmd));
}

/*
 * v_io -- [count]o
 *    Insert text after this line.
 *
 * PUBLIC: int v_io __P((SCR *, VICMD *));
 */
int
v_io(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      return (io(sp, vp, o_cmd));
}

static int
io(sp, vp, cmd)
      SCR *sp;
      VICMD *vp;
      enum which cmd;
{
      recno_t ai_line, lno;
      size_t len;
      u_int32_t flags;
      char *p;

      flags = set_txt_std(sp, vp, TXT_ADDNEWLINE | TXT_APPENDEOL);
      sp->showmode = SM_INSERT;

      if (sp->lno == 1) {
            if (db_last(sp, &lno))
                  return (1);
            if (lno != 0)
                  goto insert;
            p = NULL;
            len = 0;
            ai_line = OOBLNO;
      } else {
insert:           p = "";
            sp->cno = 0;
            LOG_CORRECT;

            if (cmd == O_cmd) {
                  if (db_insert(sp, sp->lno, p, 0))
                        return (1);
                  if (db_get(sp, sp->lno, DBG_FATAL, &p, &len))
                        return (1);
                  ai_line = sp->lno + 1;
            } else {
                  if (db_append(sp, 1, sp->lno, p, 0))
                        return (1);
                  if (db_get(sp, ++sp->lno, DBG_FATAL, &p, &len))
                        return (1);
                  ai_line = sp->lno - 1;
            }
      }
      return (v_txt(sp, vp, NULL, p, len,
          0, ai_line, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}

/*
 * v_change -- [buffer][count]c[count]motion
 *           [buffer][count]C
 *           [buffer][count]S
 *    Change command.
 *
 * PUBLIC: int v_change __P((SCR *, VICMD *));
 */
int
v_change(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t blen, len;
      u_int32_t flags;
      int isempty, lmode, rval;
      char *bp, *p;

      /*
       * 'c' can be combined with motion commands that set the resulting
       * cursor position, i.e. "cG".  Clear the VM_RCM flags and make the
       * resulting cursor position stick, inserting text has its own rules
       * for cursor positioning.
       */
      F_CLR(vp, VM_RCM_MASK);
      F_SET(vp, VM_RCM_SET);

      /*
       * Find out if the file is empty, it's easier to handle it as a
       * special case.
       */
      if (vp->m_start.lno == vp->m_stop.lno &&
          db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
            if (!isempty)
                  return (1);
            return (v_ia(sp, vp));
      }

      flags = set_txt_std(sp, vp, 0);
      sp->showmode = SM_CHANGE;

      /*
       * Move the cursor to the start of the change.  Note, if autoindent
       * is turned on, the cc command in line mode changes from the first
       * *non-blank* character of the line, not the first character.  And,
       * to make it just a bit more exciting, the initial space is handled
       * as auto-indent characters.
       */
      lmode = F_ISSET(vp, VM_LMODE) ? CUT_LINEMODE : 0;
      if (lmode) {
            vp->m_start.cno = 0;
            if (O_ISSET(sp, O_AUTOINDENT)) {
                  if (nonblank(sp, vp->m_start.lno, &vp->m_start.cno))
                        return (1);
                  LF_SET(TXT_AICHARS);
            }
      }
      sp->lno = vp->m_start.lno;
      sp->cno = vp->m_start.cno;

      LOG_CORRECT;

      /*
       * If not in line mode and changing within a single line, copy the
       * text and overwrite it.
       */
      if (!lmode && vp->m_start.lno == vp->m_stop.lno) {
            /*
             * !!!
             * Historic practice, c did not cut into the numeric buffers,
             * only the unnamed one.
             */
            if (cut(sp,
                F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
                &vp->m_start, &vp->m_stop, lmode))
                  return (1);
            if (len == 0)
                  LF_SET(TXT_APPENDEOL);
            LF_SET(TXT_EMARK | TXT_OVERWRITE);
            return (v_txt(sp, vp, &vp->m_stop, p, len,
                0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
      }

      /*
       * It's trickier if in line mode or changing over multiple lines.  If
       * we're in line mode delete all of the lines and insert a replacement
       * line which the user edits.  If there was leading whitespace in the
       * first line being changed, we copy it and use it as the replacement.
       * If we're not in line mode, we delete the text and start inserting.
       *
       * !!!
       * Copy the text.  Historic practice, c did not cut into the numeric
       * buffers, only the unnamed one.
       */
      if (cut(sp,
          F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
          &vp->m_start, &vp->m_stop, lmode))
            return (1);

      /* If replacing entire lines and there's leading text. */
      if (lmode && vp->m_start.cno) {
            /*
             * Get a copy of the first line changed, and copy out the
             * leading text.
             */
            if (db_get(sp, vp->m_start.lno, DBG_FATAL, &p, &len))
                  return (1);
            GET_SPACE_RET(sp, bp, blen, vp->m_start.cno);
            memmove(bp, p, vp->m_start.cno);
      } else
            bp = NULL;

      /* Delete the text. */
      if (del(sp, &vp->m_start, &vp->m_stop, lmode))
            return (1);

      /* If replacing entire lines, insert a replacement line. */
      if (lmode) {
            if (db_insert(sp, vp->m_start.lno, bp, vp->m_start.cno))
                  return (1);
            sp->lno = vp->m_start.lno;
            len = sp->cno = vp->m_start.cno;
      }

      /* Get the line we're editing. */
      if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
            if (!isempty)
                  return (1);
            len = 0;
      }

      /* Check to see if we're appending to the line. */
      if (vp->m_start.cno >= len)
            LF_SET(TXT_APPENDEOL);

      rval = v_txt(sp, vp, NULL, p, len,
          0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags);

      if (bp != NULL)
            FREE_SPACE(sp, bp, blen);
      return (rval);
}

/*
 * v_Replace -- [count]R
 *    Overwrite multiple characters.
 *
 * PUBLIC: int v_Replace __P((SCR *, VICMD *));
 */
int
v_Replace(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t len;
      u_int32_t flags;
      int isempty;
      char *p;

      flags = set_txt_std(sp, vp, 0);
      sp->showmode = SM_REPLACE;

      if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
            if (!isempty)
                  return (1);
            len = 0;
            LF_SET(TXT_APPENDEOL);
      } else {
            if (len == 0)
                  LF_SET(TXT_APPENDEOL);
            LF_SET(TXT_OVERWRITE | TXT_REPLACE);
      }
      vp->m_stop.lno = vp->m_start.lno;
      vp->m_stop.cno = len ? len - 1 : 0;

      return (v_txt(sp, vp, &vp->m_stop, p, len,
          0, OOBLNO, F_ISSET(vp, VC_C1SET) ? vp->count : 1, flags));
}

/*
 * v_subst -- [buffer][count]s
 *    Substitute characters.
 *
 * PUBLIC: int v_subst __P((SCR *, VICMD *));
 */
int
v_subst(sp, vp)
      SCR *sp;
      VICMD *vp;
{
      size_t len;
      u_int32_t flags;
      int isempty;
      char *p;

      flags = set_txt_std(sp, vp, 0);
      sp->showmode = SM_CHANGE;

      if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
            if (!isempty)
                  return (1);
            len = 0;
            LF_SET(TXT_APPENDEOL);
      } else {
            if (len == 0)
                  LF_SET(TXT_APPENDEOL);
            LF_SET(TXT_EMARK | TXT_OVERWRITE);
      }

      vp->m_stop.lno = vp->m_start.lno;
      vp->m_stop.cno =
          vp->m_start.cno + (F_ISSET(vp, VC_C1SET) ? vp->count - 1 : 0);
      if (vp->m_stop.cno > len - 1)
            vp->m_stop.cno = len - 1;

      if (p != NULL && cut(sp,
          F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
          &vp->m_start, &vp->m_stop, 0))
            return (1);

      return (v_txt(sp, vp, &vp->m_stop, p, len, 0, OOBLNO, 1, flags));
}

/*
 * set_txt_std --
 *    Initialize text processing flags.
 */
static u_int32_t
set_txt_std(sp, vp, flags)
      SCR *sp;
      VICMD *vp;
      u_int32_t flags;
{
      LF_SET(TXT_CNTRLT |
          TXT_ESCAPE | TXT_MAPINPUT | TXT_RECORD | TXT_RESOLVE);

      if (F_ISSET(vp, VC_ISDOT))
            LF_SET(TXT_REPLAY);

      if (O_ISSET(sp, O_ALTWERASE))
            LF_SET(TXT_ALTWERASE);
      if (O_ISSET(sp, O_AUTOINDENT))
            LF_SET(TXT_AUTOINDENT);
      if (O_ISSET(sp, O_BEAUTIFY))
            LF_SET(TXT_BEAUTIFY);
      if (O_ISSET(sp, O_SHOWMATCH))
            LF_SET(TXT_SHOWMATCH);
      if (F_ISSET(sp, SC_SCRIPT))
            LF_SET(TXT_CR);
      if (O_ISSET(sp, O_TTYWERASE))
            LF_SET(TXT_TTYWERASE);

      /*
       * !!!
       * Mapped keys were sometimes unaffected by the wrapmargin option
       * in the historic 4BSD vi.  Consider the following commands, where
       * each is executed on an empty line, in an 80 column screen, with
       * the wrapmargin value set to 60.
       *
       *    aABC DEF <ESC>....
       *    :map K aABC DEF ^V<ESC><CR>KKKKK
       *    :map K 5aABC DEF ^V<ESC><CR>K
       *
       * The first and second commands are affected by wrapmargin.  The
       * third is not.  (If the inserted text is itself longer than the
       * wrapmargin value, i.e. if the "ABC DEF " string is replaced by
       * something that's longer than 60 columns from the beginning of
       * the line, the first two commands behave as before, but the third
       * command gets fairly strange.)  The problem is that people wrote
       * macros that depended on the third command NOT being affected by
       * wrapmargin, as in this gem which centers lines:
       *
       *    map #c $mq81a ^V^[81^V^V|D`qld0:s/  / /g^V^M$p
       *
       * For compatibility reasons, we try and make it all work here.  I
       * offer no hope that this is right, but it's probably pretty close.
       *
       * XXX
       * Once I work my courage up, this is all gonna go away.  It's too
       * evil to survive.
       */
      if ((O_ISSET(sp, O_WRAPLEN) || O_ISSET(sp, O_WRAPMARGIN)) &&
          (!MAPPED_KEYS_WAITING(sp) || !F_ISSET(vp, VC_C1SET)))
            LF_SET(TXT_WRAPMARGIN);
      return (flags);
}

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