vi/v_replace.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: v_replace.c,v 10.24 2001/06/25 15:19:34 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:34 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "../common/common.h"
  29 #include "vi.h"
  30
  31 /*
  32  * v_replace -- [count]r<char>
  33  *
  34  * !!!
  35  * The r command in historic vi was almost beautiful in its badness.  For
  36  * example, "r<erase>" and "r<word erase>" beeped the terminal and deleted
  37  * a single character.  "Nr<carriage return>", where N was greater than 1,
  38  * inserted a single carriage return.  "r<escape>" did cancel the command,
  39  * but "r<literal><escape>" erased a single character.  To enter a literal
  40  * <literal> character, it required three <literal> characters after the
  41  * command.  This may not be right, but at least it's not insane.
  42  *
  43  * PUBLIC: int v_replace __P((SCR *, VICMD *));
  44  */
  45 int
  46 v_replace(SCR *sp, VICMD *vp)
  47 {
  48         EVENT ev;
  49         VI_PRIVATE *vip;
  50         TEXT *tp;
  51         size_t blen, len;
  52         u_long cnt;
  53         int quote, rval;
  54         CHAR_T *bp;
  55         CHAR_T *p;
  56
  57         vip = VIP(sp);
  58
  59         /*
  60          * If the line doesn't exist, or it's empty, replacement isn't
  61          * allowed.  It's not hard to implement, but:
  62          *
  63          *      1: It's historic practice (vi beeped before the replacement
  64          *         character was even entered).
  65          *      2: For consistency, this change would require that the more
  66          *         general case, "Nr", when the user is < N characters from
  67          *         the end of the line, also work, which would be a bit odd.
  68          *      3: Replacing with a <newline> has somewhat odd semantics.
  69          */
  70         if (db_get(sp, vp->m_start.lno, DBG_FATAL, &p, &len))
  71                 return (1);
  72         if (len == 0) {
  73                 msgq(sp, M_BERR, "186|No characters to replace");
  74                 return (1);
  75         }
  76
  77         /*
  78          * Figure out how many characters to be replace.  For no particular
  79          * reason (other than that the semantics of replacing the newline
  80          * are confusing) only permit the replacement of the characters in
  81          * the current line.  I suppose we could append replacement characters
  82          * to the line, but I see no compelling reason to do so.  Check this
  83          * before we get the character to match historic practice, where Nr
  84          * failed immediately if there were less than N characters from the
  85          * cursor to the end of the line.
  86          */
  87         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  88         vp->m_stop.lno = vp->m_start.lno;
  89         vp->m_stop.cno = vp->m_start.cno + cnt - 1;
  90         if (vp->m_stop.cno > len - 1) {
  91                 v_eol(sp, &vp->m_start);
  92                 return (1);
  93         }
  94
  95         /*
  96          * If it's not a repeat, reset the current mode and get a replacement
  97          * character.
  98          */
  99         quote = 0;
 100         if (!F_ISSET(vp, VC_ISDOT)) {
 101                 sp->showmode = SM_REPLACE;
 102                 if (vs_refresh(sp, 0))
 103                         return (1);
 104 next:           if (v_event_get(sp, &ev, 0, 0))
 105                         return (1);
 106
 107                 switch (ev.e_event) {
 108                 case E_CHARACTER:
 109                         /*
 110                          * <literal_next> means escape the next character.
 111                          * <escape> means they changed their minds.
 112                          */
 113                         if (!quote) {
 114                                 if (ev.e_value == K_VLNEXT) {
 115                                         quote = 1;
 116                                         goto next;
 117                                 }
 118                                 if (ev.e_value == K_ESCAPE)
 119                                         return (0);
 120                         }
 121                         vip->rlast = ev.e_c;
 122                         vip->rvalue = ev.e_value;
 123                         break;
 124                 case E_ERR:
 125                 case E_EOF:
 126                         F_SET(sp, SC_EXIT_FORCE);
 127                         return (1);
 128                 case E_INTERRUPT:
 129                         /* <interrupt> means they changed their minds. */
 130                         return (0);
 131                 case E_WRESIZE:
 132                         /* <resize> interrupts the input mode. */
 133                         v_emsg(sp, NULL, VIM_WRESIZE);
 134                         return (0);
 135                 case E_REPAINT:
 136                         if (v_erepaint(sp, &ev))
 137                                 return (1);
 138                         goto next;
 139                 default:
 140                         v_event_err(sp, &ev);
 141                         return (0);
 142                 }
 143         }
 144
 145         /* Copy the line. */
 146         GET_SPACE_RETW(sp, bp, blen, len);
 147         MEMMOVE(bp, p, len);
 148         p = bp;
 149
 150         /*
 151          * Versions of nvi before 1.57 created N new lines when they replaced
 152          * N characters with <carriage-return> or <newline> characters.  This
 153          * is different from the historic vi, which replaced N characters with
 154          * a single new line.  Users complained, so we match historic practice.
 155          */
 156         if (!quote && vip->rvalue == K_CR || vip->rvalue == K_NL) {
 157                 /* Set return line. */
 158                 vp->m_stop.lno = vp->m_start.lno + 1;
 159                 vp->m_stop.cno = 0;
 160
 161                 /* The first part of the current line. */
 162                 if (db_set(sp, vp->m_start.lno, p, vp->m_start.cno))
 163                         goto err_ret;
 164
 165                 /*
 166                  * The rest of the current line.  And, of course, now it gets
 167                  * tricky.  If there are characters left in the line and if
 168                  * the autoindent edit option is set, white space after the
 169                  * replaced character is discarded, autoindent is applied, and
 170                  * the cursor moves to the last indent character.
 171                  */
 172                 p += vp->m_start.cno + cnt;
 173                 len -= vp->m_start.cno + cnt;
 174                 if (len != 0 && O_ISSET(sp, O_AUTOINDENT))
 175                         for (; len && isblank(*p); --len, ++p);
 176
 177                 if ((tp = text_init(sp, p, len, len)) == NULL)
 178                         goto err_ret;
 179
 180                 if (len != 0 && O_ISSET(sp, O_AUTOINDENT)) {
 181                         if (v_txt_auto(sp, vp->m_start.lno, NULL, 0, tp))
 182                                 goto err_ret;
 183                         vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
 184                 } else
 185                         vp->m_stop.cno = 0;
 186
 187                 vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
 188                 if (db_append(sp, 1, vp->m_start.lno, tp->lb, tp->len))
 189 err_ret:                rval = 1;
 190                 else {
 191                         text_free(tp);
 192                         rval = 0;
 193                 }
 194         } else {
 195                 STRSET(bp + vp->m_start.cno, vip->rlast, cnt);
 196                 rval = db_set(sp, vp->m_start.lno, bp, len);
 197         }
 198         FREE_SPACEW(sp, bp, blen);
 199
 200         vp->m_final = vp->m_stop;
 201         return (rval);
 202 }