contrib/nvi2/vi/v_ch.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_ch.c,v 10.11 2011/12/02 19:49:50 zy Exp $";
  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 <limits.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 #include "../common/common.h"
  26 #include "vi.h"
  27
  28 static void notfound(SCR *, ARG_CHAR_T);
  29 static void noprev(SCR *);
  30
  31 /*
  32  * v_chrepeat -- [count];
  33  *      Repeat the last F, f, T or t search.
  34  *
  35  * PUBLIC: int v_chrepeat(SCR *, VICMD *);
  36  */
  37 int
  38 v_chrepeat(SCR *sp, VICMD *vp)
  39 {
  40         vp->character = VIP(sp)->lastckey;
  41
  42         switch (VIP(sp)->csearchdir) {
  43         case CNOTSET:
  44                 noprev(sp);
  45                 return (1);
  46         case FSEARCH:
  47                 return (v_chF(sp, vp));
  48         case fSEARCH:
  49                 return (v_chf(sp, vp));
  50         case TSEARCH:
  51                 return (v_chT(sp, vp));
  52         case tSEARCH:
  53                 return (v_cht(sp, vp));
  54         default:
  55                 abort();
  56         }
  57         /* NOTREACHED */
  58 }
  59
  60 /*
  61  * v_chrrepeat -- [count],
  62  *      Repeat the last F, f, T or t search in the reverse direction.
  63  *
  64  * PUBLIC: int v_chrrepeat(SCR *, VICMD *);
  65  */
  66 int
  67 v_chrrepeat(SCR *sp, VICMD *vp)
  68 {
  69         cdir_t savedir;
  70         int rval;
  71
  72         vp->character = VIP(sp)->lastckey;
  73         savedir = VIP(sp)->csearchdir;
  74
  75         switch (VIP(sp)->csearchdir) {
  76         case CNOTSET:
  77                 noprev(sp);
  78                 return (1);
  79         case FSEARCH:
  80                 rval = v_chf(sp, vp);
  81                 break;
  82         case fSEARCH:
  83                 rval = v_chF(sp, vp);
  84                 break;
  85         case TSEARCH:
  86                 rval = v_cht(sp, vp);
  87                 break;
  88         case tSEARCH:
  89                 rval = v_chT(sp, vp);
  90                 break;
  91         default:
  92                 abort();
  93         }
  94         VIP(sp)->csearchdir = savedir;
  95         return (rval);
  96 }
  97
  98 /*
  99  * v_cht -- [count]tc
 100  *      Search forward in the line for the character before the next
 101  *      occurrence of the specified character.
 102  *
 103  * PUBLIC: int v_cht(SCR *, VICMD *);
 104  */
 105 int
 106 v_cht(SCR *sp, VICMD *vp)
 107 {
 108         if (v_chf(sp, vp))
 109                 return (1);
 110
 111         /*
 112          * v_chf places the cursor on the character, where the 't'
 113          * command wants it to its left.  We know this is safe since
 114          * we had to move right for v_chf() to have succeeded.
 115          */
 116         --vp->m_stop.cno;
 117
 118         /*
 119          * Make any necessary correction to the motion decision made
 120          * by the v_chf routine.
 121          */
 122         if (!ISMOTION(vp))
 123                 vp->m_final = vp->m_stop;
 124
 125         VIP(sp)->csearchdir = tSEARCH;
 126         return (0);
 127 }
 128
 129 /*
 130  * v_chf -- [count]fc
 131  *      Search forward in the line for the next occurrence of the
 132  *      specified character.
 133  *
 134  * PUBLIC: int v_chf(SCR *, VICMD *);
 135  */
 136 int
 137 v_chf(SCR *sp, VICMD *vp)
 138 {
 139         size_t len;
 140         u_long cnt;
 141         int isempty;
 142         ARG_CHAR_T key;
 143         CHAR_T *endp, *p, *startp;
 144
 145         /*
 146          * !!!
 147          * If it's a dot command, it doesn't reset the key for which we're
 148          * searching, e.g. in "df1|f2|.|;", the ';' searches for a '2'.
 149          */
 150         key = vp->character;
 151         if (!F_ISSET(vp, VC_ISDOT))
 152                 VIP(sp)->lastckey = key;
 153         VIP(sp)->csearchdir = fSEARCH;
 154
 155         if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
 156                 if (isempty)
 157                         goto empty;
 158                 return (1);
 159         }
 160
 161         if (len == 0) {
 162 empty:          notfound(sp, key);
 163                 return (1);
 164         }
 165
 166         endp = (startp = p) + len;
 167         p += vp->m_start.cno;
 168         for (cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
 169                 while (++p < endp && *p != key);
 170                 if (p == endp) {
 171                         notfound(sp, key);
 172                         return (1);
 173                 }
 174         }
 175
 176         vp->m_stop.cno = p - startp;
 177
 178         /*
 179          * Non-motion commands move to the end of the range.
 180          * Delete and yank stay at the start, ignore others.
 181          */
 182         vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
 183         return (0);
 184 }
 185
 186 /*
 187  * v_chT -- [count]Tc
 188  *      Search backward in the line for the character after the next
 189  *      occurrence of the specified character.
 190  *
 191  * PUBLIC: int v_chT(SCR *, VICMD *);
 192  */
 193 int
 194 v_chT(SCR *sp, VICMD *vp)
 195 {
 196         if (v_chF(sp, vp))
 197                 return (1);
 198
 199         /*
 200          * v_chF places the cursor on the character, where the 'T'
 201          * command wants it to its right.  We know this is safe since
 202          * we had to move left for v_chF() to have succeeded.
 203          */
 204         ++vp->m_stop.cno;
 205         vp->m_final = vp->m_stop;
 206
 207         VIP(sp)->csearchdir = TSEARCH;
 208         return (0);
 209 }
 210
 211 /*
 212  * v_chF -- [count]Fc
 213  *      Search backward in the line for the next occurrence of the
 214  *      specified character.
 215  *
 216  * PUBLIC: int v_chF(SCR *, VICMD *);
 217  */
 218 int
 219 v_chF(SCR *sp, VICMD *vp)
 220 {
 221         size_t len;
 222         u_long cnt;
 223         int isempty;
 224         ARG_CHAR_T key;
 225         CHAR_T *endp, *p;
 226
 227         /*
 228          * !!!
 229          * If it's a dot command, it doesn't reset the key for which
 230          * we're searching, e.g. in "df1|f2|.|;", the ';' searches
 231          * for a '2'.
 232          */
 233         key = vp->character;
 234         if (!F_ISSET(vp, VC_ISDOT))
 235                 VIP(sp)->lastckey = key;
 236         VIP(sp)->csearchdir = FSEARCH;
 237
 238         if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
 239                 if (isempty)
 240                         goto empty;
 241                 return (1);
 242         }
 243
 244         if (len == 0) {
 245 empty:          notfound(sp, key);
 246                 return (1);
 247         }
 248
 249         endp = p - 1;
 250         p += vp->m_start.cno;
 251         for (cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
 252                 while (--p > endp && *p != key);
 253                 if (p == endp) {
 254                         notfound(sp, key);
 255                         return (1);
 256                 }
 257         }
 258
 259         vp->m_stop.cno = (p - endp) - 1;
 260
 261         /*
 262          * All commands move to the end of the range.  Motion commands
 263          * adjust the starting point to the character before the current
 264          * one.
 265          */
 266         vp->m_final = vp->m_stop;
 267         if (ISMOTION(vp))
 268                 --vp->m_start.cno;
 269         return (0);
 270 }
 271
 272 static void
 273 noprev(SCR *sp)
 274 {
 275         msgq(sp, M_BERR, "178|No previous F, f, T or t search");
 276 }
 277
 278 static void
 279 notfound(SCR *sp, ARG_CHAR_T ch)
 280 {
 281         msgq(sp, M_BERR, "179|%s not found", KEY_NAME(sp, ch));
 282 }