contrib/nvi/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[] = "@(#)v_replace.c   10.17 (Berkeley) 6/30/96";
  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(sp, vp)
  47         SCR *sp;
  48         VICMD *vp;
  49 {
  50         EVENT ev;
  51         VI_PRIVATE *vip;
  52         TEXT *tp;
  53         size_t blen, len;
  54         u_long cnt;
  55         int quote, rval;
  56         char *bp, *p;
  57
  58         vip = VIP(sp);
  59
  60         /*
  61          * If the line doesn't exist, or it's empty, replacement isn't
  62          * allowed.  It's not hard to implement, but:
  63          *
  64          *      1: It's historic practice (vi beeped before the replacement
  65          *         character was even entered).
  66          *      2: For consistency, this change would require that the more
  67          *         general case, "Nr", when the user is < N characters from
  68          *         the end of the line, also work, which would be a bit odd.
  69          *      3: Replacing with a <newline> has somewhat odd semantics.
  70          */
  71         if (db_get(sp, vp->m_start.lno, DBG_FATAL, &p, &len))
  72                 return (1);
  73         if (len == 0) {
  74                 msgq(sp, M_BERR, "186|No characters to replace");
  75                 return (1);
  76         }
  77
  78         /*
  79          * Figure out how many characters to be replace.  For no particular
  80          * reason (other than that the semantics of replacing the newline
  81          * are confusing) only permit the replacement of the characters in
  82          * the current line.  I suppose we could append replacement characters
  83          * to the line, but I see no compelling reason to do so.  Check this
  84          * before we get the character to match historic practice, where Nr
  85          * failed immediately if there were less than N characters from the
  86          * cursor to the end of the line.
  87          */
  88         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  89         vp->m_stop.lno = vp->m_start.lno;
  90         vp->m_stop.cno = vp->m_start.cno + cnt - 1;
  91         if (vp->m_stop.cno > len - 1) {
  92                 v_eol(sp, &vp->m_start);
  93                 return (1);
  94         }
  95
  96         /*
  97          * If it's not a repeat, reset the current mode and get a replacement
  98          * character.
  99          */
 100         quote = 0;
 101         if (!F_ISSET(vp, VC_ISDOT)) {
 102                 sp->showmode = SM_REPLACE;
 103                 if (vs_refresh(sp, 0))
 104                         return (1);
 105 next:           if (v_event_get(sp, &ev, 0, 0))
 106                         return (1);
 107
 108                 switch (ev.e_event) {
 109                 case E_CHARACTER:
 110                         /*
 111                          * <literal_next> means escape the next character.
 112                          * <escape> means they changed their minds.
 113                          */
 114                         if (!quote) {
 115                                 if (ev.e_value == K_VLNEXT) {
 116                                         quote = 1;
 117                                         goto next;
 118                                 }
 119                                 if (ev.e_value == K_ESCAPE)
 120                                         return (0);
 121                         }
 122                         vip->rlast = ev.e_c;
 123                         vip->rvalue = ev.e_value;
 124                         break;
 125                 case E_ERR:
 126                 case E_EOF:
 127                         F_SET(sp, SC_EXIT_FORCE);
 128                         return (1);
 129                 case E_INTERRUPT:
 130                         /* <interrupt> means they changed their minds. */
 131                         return (0);
 132                 case E_WRESIZE:
 133                         /* <resize> interrupts the input mode. */
 134                         v_emsg(sp, NULL, VIM_WRESIZE);
 135                         return (0);
 136                 case E_REPAINT:
 137                         if (vs_repaint(sp, &ev))
 138                                 return (1);
 139                         goto next;
 140                 default:
 141                         v_event_err(sp, &ev);
 142                         return (0);
 143                 }
 144         }
 145
 146         /* Copy the line. */
 147         GET_SPACE_RET(sp, bp, blen, len);
 148         memmove(bp, p, len);
 149         p = bp;
 150
 151         /*
 152          * Versions of nvi before 1.57 created N new lines when they replaced
 153          * N characters with <carriage-return> or <newline> characters.  This
 154          * is different from the historic vi, which replaced N characters with
 155          * a single new line.  Users complained, so we match historic practice.
 156          */
 157         if (!quote && vip->rvalue == K_CR || vip->rvalue == K_NL) {
 158                 /* Set return line. */
 159                 vp->m_stop.lno = vp->m_start.lno + 1;
 160                 vp->m_stop.cno = 0;
 161
 162                 /* The first part of the current line. */
 163                 if (db_set(sp, vp->m_start.lno, p, vp->m_start.cno))
 164                         goto err_ret;
 165
 166                 /*
 167                  * The rest of the current line.  And, of course, now it gets
 168                  * tricky.  If there are characters left in the line and if
 169                  * the autoindent edit option is set, white space after the
 170                  * replaced character is discarded, autoindent is applied, and
 171                  * the cursor moves to the last indent character.
 172                  */
 173                 p += vp->m_start.cno + cnt;
 174                 len -= vp->m_start.cno + cnt;
 175                 if (len != 0 && O_ISSET(sp, O_AUTOINDENT))
 176                         for (; len && isblank(*p); --len, ++p);
 177
 178                 if ((tp = text_init(sp, p, len, len)) == NULL)
 179                         goto err_ret;
 180
 181                 if (len != 0 && O_ISSET(sp, O_AUTOINDENT)) {
 182                         if (v_txt_auto(sp, vp->m_start.lno, NULL, 0, tp))
 183                                 goto err_ret;
 184                         vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
 185                 } else
 186                         vp->m_stop.cno = 0;
 187
 188                 vp->m_stop.cno = tp->ai ? tp->ai - 1 : 0;
 189                 if (db_append(sp, 1, vp->m_start.lno, tp->lb, tp->len))
 190 err_ret:                rval = 1;
 191                 else {
 192                         text_free(tp);
 193                         rval = 0;
 194                 }
 195         } else {
 196                 memset(bp + vp->m_start.cno, vip->rlast, cnt);
 197                 rval = db_set(sp, vp->m_start.lno, bp, len);
 198         }
 199         FREE_SPACE(sp, bp, blen);
 200
 201         vp->m_final = vp->m_stop;
 202         return (rval);
 203 }