external/bsd/nvi/dist/common/put.c

   1 /*      $NetBSD: put.c,v 1.3 2013/11/25 22:43:46 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #ifndef lint
  14 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 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "common.h"
  28
  29 /*
  30  * put --
  31  *      Put text buffer contents into the file.
  32  *
  33  * PUBLIC: int put __P((SCR *, CB *, CHAR_T *, MARK *, MARK *, int));
  34  */
  35 int
  36 put(SCR *sp, CB *cbp, ARG_CHAR_T *namep, MARK *cp, MARK *rp, int append)
  37 {
  38         ARG_CHAR_T name;
  39         TEXT *ltp, *tp;
  40         db_recno_t lno;
  41         size_t blen, clen, len;
  42         int rval;
  43         CHAR_T *bp, *t;
  44         CHAR_T *p;
  45
  46         if (cbp == NULL) {
  47                 if (namep == NULL) {
  48                         cbp = sp->wp->dcbp;
  49                         if (cbp == NULL) {
  50                                 msgq(sp, M_ERR,
  51                                     "053|The default buffer is empty");
  52                                 return (1);
  53                         }
  54                 } else {
  55                         name = *namep;
  56                         CBNAME(sp, cbp, name);
  57                         if (cbp == NULL) {
  58                                 msgq(sp, M_ERR, "054|Buffer %s is empty",
  59                                     KEY_NAME(sp, name));
  60                                 return (1);
  61                         }
  62                 }
  63         }
  64         tp = TAILQ_FIRST(&cbp->textq);
  65
  66         /*
  67          * It's possible to do a put into an empty file, meaning that the cut
  68          * buffer simply becomes the file.  It's a special case so that we can
  69          * ignore it in general.
  70          *
  71          * !!!
  72          * Historically, pasting into a file with no lines in vi would preserve
  73          * the single blank line.  This is surely a result of the fact that the
  74          * historic vi couldn't deal with a file that had no lines in it.  This
  75          * implementation treats that as a bug, and does not retain the blank
  76          * line.
  77          *
  78          * Historical practice is that the cursor ends at the first character
  79          * in the file.
  80          */
  81         if (cp->lno == 1) {
  82                 if (db_last(sp, &lno))
  83                         return (1);
  84                 if (lno == 0) {
  85                         for (; tp != NULL;
  86                             ++lno, ++sp->rptlines[L_ADDED], tp = TAILQ_NEXT(tp, q))
  87                                 if (db_append(sp, 1, lno, tp->lb, tp->len))
  88                                         return (1);
  89                         rp->lno = 1;
  90                         rp->cno = 0;
  91                         return (0);
  92                 }
  93         }
  94
  95         /* If a line mode buffer, append each new line into the file. */
  96         if (F_ISSET(cbp, CB_LMODE)) {
  97                 lno = append ? cp->lno : cp->lno - 1;
  98                 rp->lno = lno + 1;
  99                 for (; tp != NULL;
 100                     ++lno, ++sp->rptlines[L_ADDED], tp = TAILQ_NEXT(tp, q))
 101                         if (db_append(sp, 1, lno, tp->lb, tp->len))
 102                                 return (1);
 103                 rp->cno = 0;
 104                 (void)nonblank(sp, rp->lno, &rp->cno);
 105                 return (0);
 106         }
 107
 108         /*
 109          * If buffer was cut in character mode, replace the current line with
 110          * one built from the portion of the first line to the left of the
 111          * split plus the first line in the CB.  Append each intermediate line
 112          * in the CB.  Append a line built from the portion of the first line
 113          * to the right of the split plus the last line in the CB.
 114          *
 115          * Get the first line.
 116          */
 117         lno = cp->lno;
 118         if (db_get(sp, lno, DBG_FATAL, &p, &len))
 119                 return (1);
 120
 121         GET_SPACE_RETW(sp, bp, blen, tp->len + len + 1);
 122         t = bp;
 123
 124         /* Original line, left of the split. */
 125         if (len > 0 && (clen = cp->cno + (append ? 1 : 0)) > 0) {
 126                 MEMCPYW(bp, p, clen);
 127                 p += clen;
 128                 t += clen;
 129         }
 130
 131         /* First line from the CB. */
 132         if (tp->len != 0) {
 133                 MEMCPYW(t, tp->lb, tp->len);
 134                 t += tp->len;
 135         }
 136
 137         /* Calculate length left in the original line. */
 138         clen = len == 0 ? 0 : len - (cp->cno + (append ? 1 : 0));
 139
 140         /*
 141          * !!!
 142          * In the historical 4BSD version of vi, character mode puts within
 143          * a single line have two cursor behaviors: if the put is from the
 144          * unnamed buffer, the cursor moves to the character inserted which
 145          * appears last in the file.  If the put is from a named buffer,
 146          * the cursor moves to the character inserted which appears first
 147          * in the file.  In System III/V, it was changed at some point and
 148          * the cursor always moves to the first character.  In both versions
 149          * of vi, character mode puts that cross line boundaries leave the
 150          * cursor on the first character.  Nvi implements the System III/V
 151          * behavior, and expect POSIX.2 to do so as well.
 152          */
 153         rp->lno = lno;
 154         rp->cno = len == 0 ? 0 : sp->cno + (append && tp->len ? 1 : 0);
 155
 156         /*
 157          * If no more lines in the CB, append the rest of the original
 158          * line and quit.  Otherwise, build the last line before doing
 159          * the intermediate lines, because the line changes will lose
 160          * the cached line.
 161          */
 162         if (TAILQ_NEXT(tp, q) == NULL) {
 163                 if (clen > 0) {
 164                         MEMCPYW(t, p, clen);
 165                         t += clen;
 166                 }
 167                 if (db_set(sp, lno, bp, t - bp))
 168                         goto err;
 169                 if (sp->rptlchange != lno) {
 170                         sp->rptlchange = lno;
 171                         ++sp->rptlines[L_CHANGED];
 172                 }
 173         } else {
 174                 /*
 175                  * Have to build both the first and last lines of the
 176                  * put before doing any sets or we'll lose the cached
 177                  * line.  Build both the first and last lines in the
 178                  * same buffer, so we don't have to have another buffer
 179                  * floating around.
 180                  *
 181                  * Last part of original line; check for space, reset
 182                  * the pointer into the buffer.
 183                  */
 184                 ltp = TAILQ_LAST(&cbp->textq, _texth);
 185                 len = t - bp;
 186                 ADD_SPACE_RETW(sp, bp, blen, ltp->len + clen);
 187                 t = bp + len;
 188
 189                 /* Add in last part of the CB. */
 190                 MEMCPYW(t, ltp->lb, ltp->len);
 191                 if (clen)
 192                         MEMCPYW(t + ltp->len, p, clen);
 193                 clen += ltp->len;
 194
 195                 /*
 196                  * Now: bp points to the first character of the first
 197                  * line, t points to the last character of the last
 198                  * line, t - bp is the length of the first line, and
 199                  * clen is the length of the last.  Just figured you'd
 200                  * want to know.
 201                  *
 202                  * Output the line replacing the original line.
 203                  */
 204                 if (db_set(sp, lno, bp, t - bp))
 205                         goto err;
 206                 if (sp->rptlchange != lno) {
 207                         sp->rptlchange = lno;
 208                         ++sp->rptlines[L_CHANGED];
 209                 }
 210
 211                 /* Output any intermediate lines in the CB. */
 212                 for (tp = TAILQ_NEXT(tp, q);
 213                     TAILQ_NEXT(tp, q) != NULL;
 214                     ++lno, ++sp->rptlines[L_ADDED], tp = TAILQ_NEXT(tp, q))
 215                         if (db_append(sp, 1, lno, tp->lb, tp->len))
 216                                 goto err;
 217
 218                 if (db_append(sp, 1, lno, t, clen))
 219                         goto err;
 220                 ++sp->rptlines[L_ADDED];
 221         }
 222         rval = 0;
 223
 224         if (0)
 225 err:            rval = 1;
 226
 227         FREE_SPACEW(sp, bp, blen);
 228         return (rval);
 229 }