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 10.16 2000/07/16 20:49:29 skimo Exp $ (Berkeley) $Date: 2000/07/16 20:49:29 $";
  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(sp, cbp, namep, cp, rp, append)
  36         SCR *sp;
  37         CB *cbp;
  38         CHAR_T *namep;
  39         MARK *cp, *rp;
  40         int append;
  41 {
  42         CHAR_T name;
  43         TEXT *ltp, *tp;
  44         db_recno_t lno;
  45         size_t blen, clen, len;
  46         int rval;
  47         CHAR_T *bp, *t;
  48         CHAR_T *p;
  49
  50         if (cbp == NULL)
  51                 if (namep == NULL) {
  52                         cbp = sp->gp->dcbp;
  53                         if (cbp == NULL) {
  54                                 msgq(sp, M_ERR,
  55                                     "053|The default buffer is empty");
  56                                 return (1);
  57                         }
  58                 } else {
  59                         name = *namep;
  60                         CBNAME(sp, cbp, name);
  61                         if (cbp == NULL) {
  62                                 msgq(sp, M_ERR, "054|Buffer %s is empty",
  63                                     KEY_NAME(sp, name));
  64                                 return (1);
  65                         }
  66                 }
  67         tp = cbp->textq.cqh_first;
  68
  69         /*
  70          * It's possible to do a put into an empty file, meaning that the cut
  71          * buffer simply becomes the file.  It's a special case so that we can
  72          * ignore it in general.
  73          *
  74          * !!!
  75          * Historically, pasting into a file with no lines in vi would preserve
  76          * the single blank line.  This is surely a result of the fact that the
  77          * historic vi couldn't deal with a file that had no lines in it.  This
  78          * implementation treats that as a bug, and does not retain the blank
  79          * line.
  80          *
  81          * Historical practice is that the cursor ends at the first character
  82          * in the file.
  83          */
  84         if (cp->lno == 1) {
  85                 if (db_last(sp, &lno))
  86                         return (1);
  87                 if (lno == 0) {
  88                         for (; tp != (void *)&cbp->textq;
  89                             ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next)
  90                                 if (db_append(sp, 1, lno, tp->lb, tp->len))
  91                                         return (1);
  92                         rp->lno = 1;
  93                         rp->cno = 0;
  94                         return (0);
  95                 }
  96         }
  97
  98         /* If a line mode buffer, append each new line into the file. */
  99         if (F_ISSET(cbp, CB_LMODE)) {
 100                 lno = append ? cp->lno : cp->lno - 1;
 101                 rp->lno = lno + 1;
 102                 for (; tp != (void *)&cbp->textq;
 103                     ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next)
 104                         if (db_append(sp, 1, lno, tp->lb, tp->len))
 105                                 return (1);
 106                 rp->cno = 0;
 107                 (void)nonblank(sp, rp->lno, &rp->cno);
 108                 return (0);
 109         }
 110
 111         /*
 112          * If buffer was cut in character mode, replace the current line with
 113          * one built from the portion of the first line to the left of the
 114          * split plus the first line in the CB.  Append each intermediate line
 115          * in the CB.  Append a line built from the portion of the first line
 116          * to the right of the split plus the last line in the CB.
 117          *
 118          * Get the first line.
 119          */
 120         lno = cp->lno;
 121         if (db_get(sp, lno, DBG_FATAL, &p, &len))
 122                 return (1);
 123
 124         GET_SPACE_RETW(sp, bp, blen, tp->len + len + 1);
 125         t = bp;
 126
 127         /* Original line, left of the split. */
 128         if (len > 0 && (clen = cp->cno + (append ? 1 : 0)) > 0) {
 129                 MEMCPYW(bp, p, clen);
 130                 p += clen;
 131                 t += clen;
 132         }
 133
 134         /* First line from the CB. */
 135         if (tp->len != 0) {
 136                 MEMCPYW(t, tp->lb, tp->len);
 137                 t += tp->len;
 138         }
 139
 140         /* Calculate length left in the original line. */
 141         clen = len == 0 ? 0 : len - (cp->cno + (append ? 1 : 0));
 142
 143         /*
 144          * !!!
 145          * In the historical 4BSD version of vi, character mode puts within
 146          * a single line have two cursor behaviors: if the put is from the
 147          * unnamed buffer, the cursor moves to the character inserted which
 148          * appears last in the file.  If the put is from a named buffer,
 149          * the cursor moves to the character inserted which appears first
 150          * in the file.  In System III/V, it was changed at some point and
 151          * the cursor always moves to the first character.  In both versions
 152          * of vi, character mode puts that cross line boundaries leave the
 153          * cursor on the first character.  Nvi implements the System III/V
 154          * behavior, and expect POSIX.2 to do so as well.
 155          */
 156         rp->lno = lno;
 157         rp->cno = len == 0 ? 0 : sp->cno + (append && tp->len ? 1 : 0);
 158
 159         /*
 160          * If no more lines in the CB, append the rest of the original
 161          * line and quit.  Otherwise, build the last line before doing
 162          * the intermediate lines, because the line changes will lose
 163          * the cached line.
 164          */
 165         if (tp->q.cqe_next == (void *)&cbp->textq) {
 166                 if (clen > 0) {
 167                         MEMCPYW(t, p, clen);
 168                         t += clen;
 169                 }
 170                 if (db_set(sp, lno, bp, t - bp))
 171                         goto err;
 172                 if (sp->rptlchange != lno) {
 173                         sp->rptlchange = lno;
 174                         ++sp->rptlines[L_CHANGED];
 175                 }
 176         } else {
 177                 /*
 178                  * Have to build both the first and last lines of the
 179                  * put before doing any sets or we'll lose the cached
 180                  * line.  Build both the first and last lines in the
 181                  * same buffer, so we don't have to have another buffer
 182                  * floating around.
 183                  *
 184                  * Last part of original line; check for space, reset
 185                  * the pointer into the buffer.
 186                  */
 187                 ltp = cbp->textq.cqh_last;
 188                 len = t - bp;
 189                 ADD_SPACE_RETW(sp, bp, blen, ltp->len + clen);
 190                 t = bp + len;
 191
 192                 /* Add in last part of the CB. */
 193                 MEMCPYW(t, ltp->lb, ltp->len);
 194                 if (clen)
 195                         MEMCPYW(t + ltp->len, p, clen);
 196                 clen += ltp->len;
 197
 198                 /*
 199                  * Now: bp points to the first character of the first
 200                  * line, t points to the last character of the last
 201                  * line, t - bp is the length of the first line, and
 202                  * clen is the length of the last.  Just figured you'd
 203                  * want to know.
 204                  *
 205                  * Output the line replacing the original line.
 206                  */
 207                 if (db_set(sp, lno, bp, t - bp))
 208                         goto err;
 209                 if (sp->rptlchange != lno) {
 210                         sp->rptlchange = lno;
 211                         ++sp->rptlines[L_CHANGED];
 212                 }
 213
 214                 /* Output any intermediate lines in the CB. */
 215                 for (tp = tp->q.cqe_next;
 216                     tp->q.cqe_next != (void *)&cbp->textq;
 217                     ++lno, ++sp->rptlines[L_ADDED], tp = tp->q.cqe_next)
 218                         if (db_append(sp, 1, lno, tp->lb, tp->len))
 219                                 goto err;
 220
 221                 if (db_append(sp, 1, lno, t, clen))
 222                         goto err;
 223                 ++sp->rptlines[L_ADDED];
 224         }
 225         rval = 0;
 226
 227         if (0)
 228 err:            rval = 1;
 229
 230         FREE_SPACEW(sp, bp, blen);
 231         return (rval);
 232 }