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cut.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[] = "@(#)cut.c   10.10 (Berkeley) 9/15/96";
#endif /* not lint */

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

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

#include "common.h"

static void cb_rotate __P((SCR *));

/*
 * cut --
 *    Put a range of lines/columns into a TEXT buffer.
 *
 * There are two buffer areas, both found in the global structure.  The first
 * is the linked list of all the buffers the user has named, the second is the
 * unnamed buffer storage.  There is a pointer, too, which is the current
 * default buffer, i.e. it may point to the unnamed buffer or a named buffer
 * depending on into what buffer the last text was cut.  Logically, in both
 * delete and yank operations, if the user names a buffer, the text is cut
 * into it.  If it's a delete of information on more than a single line, the
 * contents of the numbered buffers are rotated up one, the contents of the
 * buffer named '9' are discarded, and the text is cut into the buffer named
 * '1'.  The text is always cut into the unnamed buffer.
 *
 * In all cases, upper-case buffer names are the same as lower-case names,
 * with the exception that they cause the buffer to be appended to instead
 * of replaced.  Note, however, that if text is appended to a buffer, the
 * default buffer only contains the appended text, not the entire contents
 * of the buffer.
 *
 * !!!
 * The contents of the default buffer would disappear after most operations
 * in historic vi.  It's unclear that this is useful, so we don't bother.
 *
 * When users explicitly cut text into the numeric buffers, historic vi became
 * genuinely strange.  I've never been able to figure out what was supposed to
 * happen.  It behaved differently if you deleted text than if you yanked text,
 * and, in the latter case, the text was appended to the buffer instead of
 * replacing the contents.  Hopefully it's not worth getting right, and here
 * we just treat the numeric buffers like any other named buffer.
 *
 * PUBLIC: int cut __P((SCR *, CHAR_T *, MARK *, MARK *, int));
 */
int
cut(sp, namep, fm, tm, flags)
      SCR *sp;
      CHAR_T *namep;
      MARK *fm, *tm;
      int flags;
{
      CB *cbp;
      CHAR_T name;
      recno_t lno;
      int append, copy_one, copy_def;

      /*
       * If the user specified a buffer, put it there.  (This may require
       * a copy into the numeric buffers.  We do the copy so that we don't
       * have to reference count and so we don't have to deal with things
       * like appends to buffers that are used multiple times.)
       *
       * Otherwise, if it's supposed to be put in a numeric buffer (usually
       * a delete) put it there.  The rules for putting things in numeric
       * buffers were historically a little strange.  There were three cases.
       *
       *    1: Some motions are always line mode motions, which means
       *       that the cut always goes into the numeric buffers.
       *    2: Some motions aren't line mode motions, e.g. d10w, but
       *       can cross line boundaries.  For these commands, if the
       *       cut crosses a line boundary, it goes into the numeric
       *       buffers.  This includes most of the commands.
       *    3: Some motions aren't line mode motions, e.g. d`<char>,
       *       but always go into the numeric buffers, regardless.  This
       *       was the commands: % ` / ? ( ) N n { } -- and nvi adds ^A.
       *
       * Otherwise, put it in the unnamed buffer.
       */
      append = copy_one = copy_def = 0;
      if (namep != NULL) {
            name = *namep;
            if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) &&
                (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) {
                  copy_one = 1;
                  cb_rotate(sp);
            }
            if ((append = isupper(name)) == 1) {
                  if (!copy_one)
                        copy_def = 1;
                  name = tolower(name);
            }
namecb:           CBNAME(sp, cbp, name);
      } else if (LF_ISSET(CUT_NUMREQ) || LF_ISSET(CUT_NUMOPT) &&
          (LF_ISSET(CUT_LINEMODE) || fm->lno != tm->lno)) {
            name = '1';
            cb_rotate(sp);
            goto namecb;
      } else
            cbp = &sp->gp->dcb_store;

copyloop:
      /*
       * If this is a new buffer, create it and add it into the list.
       * Otherwise, if it's not an append, free its current contents.
       */
      if (cbp == NULL) {
            CALLOC_RET(sp, cbp, CB *, 1, sizeof(CB));
            cbp->name = name;
            CIRCLEQ_INIT(&cbp->textq);
            LIST_INSERT_HEAD(&sp->gp->cutq, cbp, q);
      } else if (!append) {
            text_lfree(&cbp->textq);
            cbp->len = 0;
            cbp->flags = 0;
      }


#define     ENTIRE_LINE 0
      /* In line mode, it's pretty easy, just cut the lines. */
      if (LF_ISSET(CUT_LINEMODE)) {
            cbp->flags |= CB_LMODE;
            for (lno = fm->lno; lno <= tm->lno; ++lno)
                  if (cut_line(sp, lno, 0, 0, cbp))
                        goto cut_line_err;
      } else {
            /*
             * Get the first line.  A length of 0 causes cut_line
             * to cut from the MARK to the end of the line.
             */
            if (cut_line(sp, fm->lno, fm->cno, fm->lno != tm->lno ?
                ENTIRE_LINE : (tm->cno - fm->cno) + 1, cbp))
                  goto cut_line_err;

            /* Get the intermediate lines. */
            for (lno = fm->lno; ++lno < tm->lno;)
                  if (cut_line(sp, lno, 0, ENTIRE_LINE, cbp))
                        goto cut_line_err;

            /* Get the last line. */
            if (tm->lno != fm->lno &&
                cut_line(sp, lno, 0, tm->cno + 1, cbp))
                  goto cut_line_err;
      }

      append = 0;       /* Only append to the named buffer. */
      sp->gp->dcbp = cbp;     /* Repoint the default buffer on each pass. */

      if (copy_one) {         /* Copy into numeric buffer 1. */
            name = '1';
            CBNAME(sp, cbp, name);
            copy_one = 0;
            goto copyloop;
      }
      if (copy_def) {         /* Copy into the default buffer. */
            cbp = &sp->gp->dcb_store;
            copy_def = 0;
            goto copyloop;
      }
      return (0);

cut_line_err:     
      text_lfree(&cbp->textq);
      cbp->len = 0;
      cbp->flags = 0;
      return (1);
}

/*
 * cb_rotate --
 *    Rotate the numbered buffers up one.
 */
static void
cb_rotate(sp)
      SCR *sp;
{
      CB *cbp, *del_cbp;

      del_cbp = NULL;
      for (cbp = sp->gp->cutq.lh_first; cbp != NULL; cbp = cbp->q.le_next)
            switch(cbp->name) {
            case '1':
                  cbp->name = '2';
                  break;
            case '2':
                  cbp->name = '3';
                  break;
            case '3':
                  cbp->name = '4';
                  break;
            case '4':
                  cbp->name = '5';
                  break;
            case '5':
                  cbp->name = '6';
                  break;
            case '6':
                  cbp->name = '7';
                  break;
            case '7':
                  cbp->name = '8';
                  break;
            case '8':
                  cbp->name = '9';
                  break;
            case '9':
                  del_cbp = cbp;
                  break;
            }
      if (del_cbp != NULL) {
            LIST_REMOVE(del_cbp, q);
            text_lfree(&del_cbp->textq);
            free(del_cbp);
      }
}

/*
 * cut_line --
 *    Cut a portion of a single line.
 *
 * PUBLIC: int cut_line __P((SCR *, recno_t, size_t, size_t, CB *));
 */
int
cut_line(sp, lno, fcno, clen, cbp)
      SCR *sp;
      recno_t lno;
      size_t fcno, clen;
      CB *cbp;
{
      TEXT *tp;
      size_t len;
      char *p;

      /* Get the line. */
      if (db_get(sp, lno, DBG_FATAL, &p, &len))
            return (1);

      /* Create a TEXT structure that can hold the entire line. */
      if ((tp = text_init(sp, NULL, 0, len)) == NULL)
            return (1);

      /*
       * If the line isn't empty and it's not the entire line,
       * copy the portion we want, and reset the TEXT length.
       */
      if (len != 0) {
            if (clen == 0)
                  clen = len - fcno;
            memcpy(tp->lb, p + fcno, clen);
            tp->len = clen;
      }

      /* Append to the end of the cut buffer. */
      CIRCLEQ_INSERT_TAIL(&cbp->textq, tp, q);
      cbp->len += tp->len;

      return (0);
}

/*
 * cut_close --
 *    Discard all cut buffers.
 *
 * PUBLIC: void cut_close __P((GS *));
 */
void
cut_close(gp)
      GS *gp;
{
      CB *cbp;

      /* Free cut buffer list. */
      while ((cbp = gp->cutq.lh_first) != NULL) {
            if (cbp->textq.cqh_first != (void *)&cbp->textq)
                  text_lfree(&cbp->textq);
            LIST_REMOVE(cbp, q);
            free(cbp);
      }

      /* Free default cut storage. */
      cbp = &gp->dcb_store;
      if (cbp->textq.cqh_first != (void *)&cbp->textq)
            text_lfree(&cbp->textq);
}

/*
 * text_init --
 *    Allocate a new TEXT structure.
 *
 * PUBLIC: TEXT *text_init __P((SCR *, const char *, size_t, size_t));
 */
TEXT *
text_init(sp, p, len, total_len)
      SCR *sp;
      const char *p;
      size_t len, total_len;
{
      TEXT *tp;

      CALLOC(sp, tp, TEXT *, 1, sizeof(TEXT));
      if (tp == NULL)
            return (NULL);
      /* ANSI C doesn't define a call to malloc(3) for 0 bytes. */
      if ((tp->lb_len = total_len) != 0) {
            MALLOC(sp, tp->lb, CHAR_T *, tp->lb_len);
            if (tp->lb == NULL) {
                  free(tp);
                  return (NULL);
            }
            if (p != NULL && len != 0)
                  memcpy(tp->lb, p, len);
      }
      tp->len = len;
      return (tp);
}

/*
 * text_lfree --
 *    Free a chain of text structures.
 *
 * PUBLIC: void text_lfree __P((TEXTH *));
 */
void
text_lfree(headp)
      TEXTH *headp;
{
      TEXT *tp;

      while ((tp = headp->cqh_first) != (void *)headp) {
            CIRCLEQ_REMOVE(headp, tp, q);
            text_free(tp);
      }
}

/*
 * text_free --
 *    Free a text structure.
 *
 * PUBLIC: void text_free __P((TEXT *));
 */
void
text_free(tp)
      TEXT *tp;
{
      if (tp->lb != NULL)
            free(tp->lb);
      free(tp);
}

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