dist/nvi/ex/ex_join.c

   1 /*      $NetBSD: ex_join.c,v 1.1.1.2 2008/05/18 14:31:16 aymeric Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   7  *      Keith Bostic.  All rights reserved.
   8  *
   9  * See the LICENSE file for redistribution information.
  10  */
  11
  12 #include "config.h"
  13
  14 #ifndef lint
  15 static const char sccsid[] = "Id: ex_join.c,v 10.17 2004/03/16 14:14:04 skimo Exp (Berkeley) Date: 2004/03/16 14:14:04";
  16 #endif /* not lint */
  17
  18 #include <sys/types.h>
  19 #include <sys/queue.h>
  20
  21 #include <bitstring.h>
  22 #include <ctype.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "../common/common.h"
  29
  30 /*
  31  * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
  32  *      Join lines.
  33  *
  34  * PUBLIC: int ex_join __P((SCR *, EXCMD *));
  35  */
  36 int
  37 ex_join(SCR *sp, EXCMD *cmdp)
  38 {
  39         db_recno_t from, to;
  40         size_t blen, clen, len, tlen;
  41         int echar = 0, extra, first;
  42         CHAR_T *bp, *tbp = NULL;
  43         CHAR_T *p;
  44
  45         NEEDFILE(sp, cmdp);
  46
  47         from = cmdp->addr1.lno;
  48         to = cmdp->addr2.lno;
  49
  50         /* Check for no lines to join. */
  51         if (!db_exist(sp, from + 1)) {
  52                 msgq(sp, M_ERR, "131|No following lines to join");
  53                 return (1);
  54         }
  55
  56         GET_SPACE_RETW(sp, bp, blen, 256);
  57
  58         /*
  59          * The count for the join command was off-by-one,
  60          * historically, to other counts for other commands.
  61          */
  62         if (F_ISSET(cmdp, E_ADDR_DEF) || cmdp->addrcnt == 1)
  63                 ++cmdp->addr2.lno;
  64
  65         clen = tlen = 0;
  66         for (first = 1,
  67             from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
  68                 /*
  69                  * Get next line.  Historic versions of vi allowed "10J" while
  70                  * less than 10 lines from the end-of-file, so we do too.
  71                  */
  72                 if (db_get(sp, from, 0, &p, &len)) {
  73                         cmdp->addr2.lno = from - 1;
  74                         break;
  75                 }
  76
  77                 /* Empty lines just go away. */
  78                 if (len == 0)
  79                         continue;
  80
  81                 /*
  82                  * Get more space if necessary.  Note, tlen isn't the length
  83                  * of the new line, it's roughly the amount of space needed.
  84                  * tbp - bp is the length of the new line.
  85                  */
  86                 tlen += len + 2;
  87                 ADD_SPACE_RETW(sp, bp, blen, tlen);
  88                 tbp = bp + clen;
  89
  90                 /*
  91                  * Historic practice:
  92                  *
  93                  * If force specified, join without modification.
  94                  * If the current line ends with whitespace, strip leading
  95                  *    whitespace from the joined line.
  96                  * If the next line starts with a ), do nothing.
  97                  * If the current line ends with ., insert two spaces.
  98                  * Else, insert one space.
  99                  *
 100                  * One change -- add ? and ! to the list of characters for
 101                  * which we insert two spaces.  I expect that POSIX 1003.2
 102                  * will require this as well.
 103                  *
 104                  * Echar is the last character in the last line joined.
 105                  */
 106                 extra = 0;
 107                 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
 108                         if (isblank(echar))
 109                                 for (; len && isblank(*p); --len, ++p);
 110                         else if (p[0] != ')') {
 111                                 if (strchr(".?!", echar)) {
 112                                         *tbp++ = ' ';
 113                                         ++clen;
 114                                         extra = 1;
 115                                 }
 116                                 *tbp++ = ' ';
 117                                 ++clen;
 118                                 for (; len && isblank(*p); --len, ++p);
 119                         }
 120                 }
 121
 122                 if (len != 0) {
 123                         MEMCPYW(tbp, p, len);
 124                         tbp += len;
 125                         clen += len;
 126                         echar = p[len - 1];
 127                 } else
 128                         echar = ' ';
 129
 130                 /*
 131                  * Historic practice for vi was to put the cursor at the first
 132                  * inserted whitespace character, if there was one, or the
 133                  * first character of the joined line, if there wasn't, or the
 134                  * last character of the line if joined to an empty line.  If
 135                  * a count was specified, the cursor was moved as described
 136                  * for the first line joined, ignoring subsequent lines.  If
 137                  * the join was a ':' command, the cursor was placed at the
 138                  * first non-blank character of the line unless the cursor was
 139                  * "attracted" to the end of line when the command was executed
 140                  * in which case it moved to the new end of line.  There are
 141                  * probably several more special cases, but frankly, my dear,
 142                  * I don't give a damn.  This implementation puts the cursor
 143                  * on the first inserted whitespace character, the first
 144                  * character of the joined line, or the last character of the
 145                  * line regardless.  Note, if the cursor isn't on the joined
 146                  * line (possible with : commands), it is reset to the starting
 147                  * line.
 148                  */
 149                 if (first) {
 150                         sp->cno = (tbp - bp) - (1 + extra);
 151                         first = 0;
 152                 } else
 153                         sp->cno = (tbp - bp) - len - (1 + extra);
 154         }
 155         sp->lno = cmdp->addr1.lno;
 156
 157         /* Delete the joined lines. */
 158         for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
 159                 if (db_delete(sp, to))
 160                         goto err;
 161
 162         /* If the original line changed, reset it. */
 163         if (!first && db_set(sp, from, bp, tbp - bp)) {
 164 err:            FREE_SPACEW(sp, bp, blen);
 165                 return (1);
 166         }
 167         FREE_SPACEW(sp, bp, blen);
 168
 169         sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
 170         return (0);
 171 }