common/put.c

   1 /*-
   2  * Copyright (c) 1992, 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: put.c,v 10.18 2001/06/25 15:19:11 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:11 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18
  19 #include <bitstring.h>
  20 #include <ctype.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include "common.h"
  27
  28 /*
  29  * put --
  30  *      Put text buffer contents into the file.
  31  *
  32  * PUBLIC: int put __P((SCR *, CB *, CHAR_T *, MARK *, MARK *, int));
  33  */
  34 int
  35 put(SCR *sp, CB *cbp, CHAR_T *namep, MARK *cp, MARK *rp, int append)
  36 {
  37         CHAR_T name;
  38         TEXT *ltp, *tp;
  39         db_recno_t lno;
  40         size_t blen, clen, len;
  41         int rval;
  42         CHAR_T *bp, *t;
  43         CHAR_T *p;
  44
  45         if (cbp == NULL)
  46                 if (namep == NULL) {
  47                         cbp = sp->wp->dcbp;
  48                         if (cbp == NULL) {
  49                                 msgq(sp, M_ERR,
  50                                     "053|The default buffer is empty");
  51                                 return (1);
  52                         }
  53                 } else {
  54                         name = *namep;
  55                         CBNAME(sp, cbp, name);
  56                         if (cbp == NULL) {
  57                                 msgq(sp, M_ERR, "054|Buffer %s is empty",
  58                                     KEY_NAME(sp, name));
  59                                 return (1);
  60                         }
  61                 }
  62         tp = cbp->textq.cqh_first;
  63
  64         /*
  65          * It's possible to do a put into an empty file, meaning that the cut
  66          * buffer simply becomes the file.  It's a special case so that we can
  67          * ignore it in general.
  68          *
  69          * !!!
  70          * Historically, pasting into a file with no lines in vi would preserve
  71          * the single blank line.  This is surely a result of the fact that the
  72          * historic vi couldn't deal with a file that had no lines in it.  This
  73          * implementation treats that as a bug, and does not retain the blank
  74          * line.
  75          *
  76          * Historical practice is that the cursor ends at the first character
  77          * in the file.
  78          */
  79         if (cp->lno == 1) {
  80                 if (db_last(sp, &lno))
  81                         return (1);
  82                 if (lno == 0) {
  83                         for (; tp != (void *)&cbp->textq;
  84                             ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next)
  85                                 if (db_append(sp, 1, lno, tp->lb, tp->len))
  86                                         return (1);
  87                         rp->lno = 1;
  88                         rp->cno = 0;
  89                         return (0);
  90                 }
  91         }
  92
  93         /* If a line mode buffer, append each new line into the file. */
  94         if (F_ISSET(cbp, CB_LMODE)) {
  95                 lno = append ? cp->lno : cp->lno - 1;
  96                 rp->lno = lno + 1;
  97                 for (; tp != (void *)&cbp->textq;
  98                     ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next)
  99                         if (db_append(sp, 1, lno, tp->lb, tp->len))
 100                                 return (1);
 101                 rp->cno = 0;
 102                 (void)nonblank(sp, rp->lno, &rp->cno);
 103                 return (0);
 104         }
 105
 106         /*
 107          * If buffer was cut in character mode, replace the current line with
 108          * one built from the portion of the first line to the left of the
 109          * split plus the first line in the CB.  Append each intermediate line
 110          * in the CB.  Append a line built from the portion of the first line
 111          * to the right of the split plus the last line in the CB.
 112          *
 113          * Get the first line.
 114          */
 115         lno = cp->lno;
 116         if (db_get(sp, lno, DBG_FATAL, &p, &len))
 117                 return (1);
 118
 119         GET_SPACE_RETW(sp, bp, blen, tp->len + len + 1);
 120         t = bp;
 121
 122         /* Original line, left of the split. */
 123         if (len > 0 && (clen = cp->cno + (append ? 1 : 0)) > 0) {
 124                 MEMCPYW(bp, p, clen);
 125                 p += clen;
 126                 t += clen;
 127         }
 128
 129         /* First line from the CB. */
 130         if (tp->len != 0) {
 131                 MEMCPYW(t, tp->lb, tp->len);
 132                 t += tp->len;
 133         }
 134
 135         /* Calculate length left in the original line. */
 136         clen = len == 0 ? 0 : len - (cp->cno + (append ? 1 : 0));
 137
 138         /*
 139          * !!!
 140          * In the historical 4BSD version of vi, character mode puts within
 141          * a single line have two cursor behaviors: if the put is from the
 142          * unnamed buffer, the cursor moves to the character inserted which
 143          * appears last in the file.  If the put is from a named buffer,
 144          * the cursor moves to the character inserted which appears first
 145          * in the file.  In System III/V, it was changed at some point and
 146          * the cursor always moves to the first character.  In both versions
 147          * of vi, character mode puts that cross line boundaries leave the
 148          * cursor on the first character.  Nvi implements the System III/V
 149          * behavior, and expect POSIX.2 to do so as well.
 150          */
 151         rp->lno = lno;
 152         rp->cno = len == 0 ? 0 : sp->cno + (append && tp->len ? 1 : 0);
 153
 154         /*
 155          * If no more lines in the CB, append the rest of the original
 156          * line and quit.  Otherwise, build the last line before doing
 157          * the intermediate lines, because the line changes will lose
 158          * the cached line.
 159          */
 160         if (tp->q.cqe_next == (void *)&cbp->textq) {
 161                 if (clen > 0) {
 162                         MEMCPYW(t, p, clen);
 163                         t += clen;
 164                 }
 165                 if (db_set(sp, lno, bp, t - bp))
 166                         goto err;
 167                 if (sp->rptlchange != lno) {
 168                         sp->rptlchange = lno;
 169                         ++sp->rptlines[L_CHANGED];
 170                 }
 171         } else {
 172                 /*
 173                  * Have to build both the first and last lines of the
 174                  * put before doing any sets or we'll lose the cached
 175                  * line.  Build both the first and last lines in the
 176                  * same buffer, so we don't have to have another buffer
 177                  * floating around.
 178                  *
 179                  * Last part of original line; check for space, reset
 180                  * the pointer into the buffer.
 181                  */
 182                 ltp = cbp->textq.cqh_last;
 183                 len = t - bp;
 184                 ADD_SPACE_RETW(sp, bp, blen, ltp->len + clen);
 185                 t = bp + len;
 186
 187                 /* Add in last part of the CB. */
 188                 MEMCPYW(t, ltp->lb, ltp->len);
 189                 if (clen)
 190                         MEMCPYW(t + ltp->len, p, clen);
 191                 clen += ltp->len;
 192
 193                 /*
 194                  * Now: bp points to the first character of the first
 195                  * line, t points to the last character of the last
 196                  * line, t - bp is the length of the first line, and
 197                  * clen is the length of the last.  Just figured you'd
 198                  * want to know.
 199                  *
 200                  * Output the line replacing the original line.
 201                  */
 202                 if (db_set(sp, lno, bp, t - bp))
 203                         goto err;
 204                 if (sp->rptlchange != lno) {
 205                         sp->rptlchange = lno;
 206                         ++sp->rptlines[L_CHANGED];
 207                 }
 208
 209                 /* Output any intermediate lines in the CB. */
 210                 for (tp = tp->q.cqe_next;
 211                     tp->q.cqe_next != (void *)&cbp->textq;
 212                     ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next)
 213                         if (db_append(sp, 1, lno, tp->lb, tp->len))
 214                                 goto err;
 215
 216                 if (db_append(sp, 1, lno, t, clen))
 217                         goto err;
 218                 ++sp->rptlines[L_ADDED];
 219         }
 220         rval = 0;
 221
 222         if (0)
 223 err:            rval = 1;
 224
 225         FREE_SPACEW(sp, bp, blen);
 226         return (rval);
 227 }