contrib/nvi2/ex/ex_join.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 #include <sys/types.h>
  13 #include <sys/queue.h>
  14 #include <sys/time.h>
  15
  16 #include <bitstring.h>
  17 #include <ctype.h>
  18 #include <limits.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "../common/common.h"
  24
  25 /*
  26  * ex_join -- :[line [,line]] j[oin][!] [count] [flags]
  27  *      Join lines.
  28  *
  29  * PUBLIC: int ex_join(SCR *, EXCMD *);
  30  */
  31 int
  32 ex_join(SCR *sp, EXCMD *cmdp)
  33 {
  34         recno_t from, to;
  35         size_t blen, clen, len, tlen;
  36         int echar = 0, extra, first;
  37         CHAR_T *bp, *tbp = NULL;
  38         CHAR_T *p;
  39
  40         NEEDFILE(sp, cmdp);
  41
  42         from = cmdp->addr1.lno;
  43         to = cmdp->addr2.lno;
  44
  45         /* Check for no lines to join. */
  46         if (!db_exist(sp, from + 1)) {
  47                 msgq(sp, M_ERR, "131|No following lines to join");
  48                 return (1);
  49         }
  50
  51         GET_SPACE_RETW(sp, bp, blen, 256);
  52
  53         /*
  54          * The count for the join command was off-by-one,
  55          * historically, to other counts for other commands.
  56          */
  57         if (F_ISSET(cmdp, E_ADDR_DEF) || cmdp->addrcnt == 1)
  58                 ++cmdp->addr2.lno;
  59
  60         clen = tlen = 0;
  61         for (first = 1,
  62             from = cmdp->addr1.lno, to = cmdp->addr2.lno; from <= to; ++from) {
  63                 /*
  64                  * Get next line.  Historic versions of vi allowed "10J" while
  65                  * less than 10 lines from the end-of-file, so we do too.
  66                  */
  67                 if (db_get(sp, from, 0, &p, &len)) {
  68                         cmdp->addr2.lno = from - 1;
  69                         break;
  70                 }
  71
  72                 /* Empty lines just go away. */
  73                 if (len == 0)
  74                         continue;
  75
  76                 /*
  77                  * Get more space if necessary.  Note, tlen isn't the length
  78                  * of the new line, it's roughly the amount of space needed.
  79                  * tbp - bp is the length of the new line.
  80                  */
  81                 tlen += len + 2;
  82                 ADD_SPACE_RETW(sp, bp, blen, tlen);
  83                 tbp = bp + clen;
  84
  85                 /*
  86                  * Historic practice:
  87                  *
  88                  * If force specified, join without modification.
  89                  * If the current line ends with whitespace, strip leading
  90                  *    whitespace from the joined line.
  91                  * If the next line starts with a ), do nothing.
  92                  * If the current line ends with ., insert two spaces.
  93                  * Else, insert one space.
  94                  *
  95                  * One change -- add ? and ! to the list of characters for
  96                  * which we insert two spaces.  I expect that POSIX 1003.2
  97                  * will require this as well.
  98                  *
  99                  * Echar is the last character in the last line joined.
 100                  */
 101                 extra = 0;
 102                 if (!first && !FL_ISSET(cmdp->iflags, E_C_FORCE)) {
 103                         if (isblank(echar))
 104                                 for (; len && isblank(*p); --len, ++p);
 105                         else if (p[0] != ')') {
 106                                 if (STRCHR(L(".?!"), echar)) {
 107                                         *tbp++ = ' ';
 108                                         ++clen;
 109                                         extra = 1;
 110                                 }
 111                                 *tbp++ = ' ';
 112                                 ++clen;
 113                                 for (; len && isblank(*p); --len, ++p);
 114                         }
 115                 }
 116
 117                 if (len != 0) {
 118                         MEMCPY(tbp, p, len);
 119                         tbp += len;
 120                         clen += len;
 121                         echar = p[len - 1];
 122                 } else
 123                         echar = ' ';
 124
 125                 /*
 126                  * Historic practice for vi was to put the cursor at the first
 127                  * inserted whitespace character, if there was one, or the
 128                  * first character of the joined line, if there wasn't, or the
 129                  * last character of the line if joined to an empty line.  If
 130                  * a count was specified, the cursor was moved as described
 131                  * for the first line joined, ignoring subsequent lines.  If
 132                  * the join was a ':' command, the cursor was placed at the
 133                  * first non-blank character of the line unless the cursor was
 134                  * "attracted" to the end of line when the command was executed
 135                  * in which case it moved to the new end of line.  There are
 136                  * probably several more special cases, but frankly, my dear,
 137                  * I don't give a damn.  This implementation puts the cursor
 138                  * on the first inserted whitespace character, the first
 139                  * character of the joined line, or the last character of the
 140                  * line regardless.  Note, if the cursor isn't on the joined
 141                  * line (possible with : commands), it is reset to the starting
 142                  * line.
 143                  */
 144                 if (first) {
 145                         sp->cno = (tbp - bp) - (1 + extra);
 146                         first = 0;
 147                 } else
 148                         sp->cno = (tbp - bp) - len - (1 + extra);
 149         }
 150         sp->lno = cmdp->addr1.lno;
 151
 152         /* Delete the joined lines. */
 153         for (from = cmdp->addr1.lno, to = cmdp->addr2.lno; to > from; --to)
 154                 if (db_delete(sp, to))
 155                         goto err;
 156
 157         /* If the original line changed, reset it. */
 158         if (!first && db_set(sp, from, bp, tbp - bp)) {
 159 err:            FREE_SPACEW(sp, bp, blen);
 160                 return (1);
 161         }
 162         FREE_SPACEW(sp, bp, blen);
 163
 164         sp->rptlines[L_JOINED] += (cmdp->addr2.lno - cmdp->addr1.lno) + 1;
 165         return (0);
 166 }