contrib/nvi2/vi/v_match.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_match.c,v 10.11 2012/02/11 00:33:46 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 <ctype.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "../common/common.h"
  28 #include "vi.h"
  29
  30 /*
  31  * v_match -- %
  32  *      Search to matching character.
  33  *
  34  * PUBLIC: int v_match(SCR *, VICMD *);
  35  */
  36 int
  37 v_match(SCR *sp, VICMD *vp)
  38 {
  39         VCS cs;
  40         MARK *mp;
  41         size_t cno, len, off;
  42         int cnt, isempty, matchc, startc, (*gc)(SCR *, VCS *);
  43         CHAR_T *p;
  44         CHAR_T *cp;
  45         const CHAR_T *match_chars;
  46
  47         /*
  48          * Historically vi would match (), {} and [] however
  49          * an update included <>.  This is ok for editing HTML
  50          * but a pain in the butt for C source.
  51          * Making it an option lets the user decide what is 'right'.
  52          */
  53         match_chars = VIP(sp)->mcs;
  54
  55         /*
  56          * !!!
  57          * Historic practice; ignore the count.
  58          *
  59          * !!!
  60          * Historical practice was to search for the initial character in the
  61          * forward direction only.
  62          */
  63         if (db_eget(sp, vp->m_start.lno, &p, &len, &isempty)) {
  64                 if (isempty)
  65                         goto nomatch;
  66                 return (1);
  67         }
  68         for (off = vp->m_start.cno;; ++off) {
  69                 if (off >= len) {
  70 nomatch:                msgq(sp, M_BERR, "184|No match character on this line");
  71                         return (1);
  72                 }
  73                 startc = p[off];
  74                 cp = STRCHR(match_chars, startc);
  75                 if (cp != NULL) {
  76                         cnt = cp - match_chars;
  77                         matchc = match_chars[cnt ^ 1];
  78                         gc = cnt & 1 ? cs_prev : cs_next;
  79                         break;
  80                 }
  81         }
  82
  83         cs.cs_lno = vp->m_start.lno;
  84         cs.cs_cno = off;
  85         if (cs_init(sp, &cs))
  86                 return (1);
  87         for (cnt = 1;;) {
  88                 if (gc(sp, &cs))
  89                         return (1);
  90                 if (cs.cs_flags != 0) {
  91                         if (cs.cs_flags == CS_EOF || cs.cs_flags == CS_SOF)
  92                                 break;
  93                         continue;
  94                 }
  95                 if (cs.cs_ch == startc)
  96                         ++cnt;
  97                 else if (cs.cs_ch == matchc && --cnt == 0)
  98                         break;
  99         }
 100         if (cnt) {
 101                 msgq(sp, M_BERR, "185|Matching character not found");
 102                 return (1);
 103         }
 104
 105         vp->m_stop.lno = cs.cs_lno;
 106         vp->m_stop.cno = cs.cs_cno;
 107
 108         /*
 109          * If moving right, non-motion commands move to the end of the range.
 110          * Delete and yank stay at the start.
 111          *
 112          * If moving left, all commands move to the end of the range.
 113          *
 114          * !!!
 115          * Don't correct for leftward movement -- historic vi deleted the
 116          * starting cursor position when deleting to a match.
 117          */
 118         if (vp->m_start.lno < vp->m_stop.lno ||
 119             (vp->m_start.lno == vp->m_stop.lno &&
 120             vp->m_start.cno < vp->m_stop.cno))
 121                 vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
 122         else
 123                 vp->m_final = vp->m_stop;
 124
 125         /*
 126          * !!!
 127          * If the motion is across lines, and the earliest cursor position
 128          * is at or before any non-blank characters in the line, i.e. the
 129          * movement is cutting all of the line's text, and the later cursor
 130          * position has nothing other than whitespace characters between it
 131          * and the end of its line, the buffer is in line mode.
 132          */
 133         if (!ISMOTION(vp) || vp->m_start.lno == vp->m_stop.lno)
 134                 return (0);
 135         mp = vp->m_start.lno < vp->m_stop.lno ? &vp->m_start : &vp->m_stop;
 136         if (mp->cno != 0) {
 137                 cno = 0;
 138                 if (nonblank(sp, mp->lno, &cno))
 139                         return (1);
 140                 if (cno < mp->cno)
 141                         return (0);
 142         }
 143         mp = vp->m_start.lno < vp->m_stop.lno ? &vp->m_stop : &vp->m_start;
 144         if (db_get(sp, mp->lno, DBG_FATAL, &p, &len))
 145                 return (1);
 146         for (p += mp->cno + 1, len -= mp->cno; --len; ++p)
 147                 if (!isblank(*p))
 148                         return (0);
 149         F_SET(vp, VM_LMODE);
 150         return (0);
 151 }
 152
 153 /*
 154  * v_buildmcs --
 155  *      Build the match character list.
 156  *
 157  * PUBLIC: int v_buildmcs(SCR *, char *);
 158  */
 159 int
 160 v_buildmcs(SCR *sp, char *str)
 161 {
 162         CHAR_T **mp = &VIP(sp)->mcs;
 163         size_t len = strlen(str) + 1;
 164
 165         if (*mp != NULL)
 166                 free(*mp);
 167         MALLOC(sp, *mp, CHAR_T *, len * sizeof(CHAR_T));
 168         if (*mp == NULL)
 169                 return (1);
 170 #ifdef USE_WIDECHAR
 171         if (mbstowcs(*mp, str, len) == (size_t)-1)
 172                 return (1);
 173 #else
 174         memcpy(*mp, str, len);
 175 #endif
 176         return (0);
 177 }