external/bsd/nvi/dist/vi/v_ulcase.c

   1 /*      $NetBSD: v_ulcase.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #include <sys/cdefs.h>
  14 #if 0
  15 #ifndef lint
  16 static const char sccsid[] = "Id: v_ulcase.c,v 10.11 2001/06/25 15:19:36 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:36 ";
  17 #endif /* not lint */
  18 #else
  19 __RCSID("$NetBSD: v_ulcase.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
  20 #endif
  21
  22 #include <sys/types.h>
  23 #include <sys/queue.h>
  24 #include <sys/time.h>
  25
  26 #include <bitstring.h>
  27 #include <ctype.h>
  28 #include <errno.h>
  29 #include <limits.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 #include "../common/common.h"
  35 #include "vi.h"
  36
  37 static int ulcase __P((SCR *, db_recno_t, CHAR_T *, size_t, size_t, size_t));
  38
  39 /*
  40  * v_ulcase -- [count]~
  41  *      Toggle upper & lower case letters.
  42  *
  43  * !!!
  44  * Historic vi didn't permit ~ to cross newline boundaries.  I can
  45  * think of no reason why it shouldn't, which at least lets the user
  46  * auto-repeat through a paragraph.
  47  *
  48  * !!!
  49  * In historic vi, the count was ignored.  It would have been better
  50  * if there had been an associated motion, but it's too late to make
  51  * that the default now.
  52  *
  53  * PUBLIC: int v_ulcase __P((SCR *, VICMD *));
  54  */
  55 int
  56 v_ulcase(SCR *sp, VICMD *vp)
  57 {
  58         db_recno_t lno;
  59         size_t cno, lcnt, len;
  60         u_long cnt;
  61         CHAR_T *p;
  62
  63         lno = vp->m_start.lno;
  64         cno = vp->m_start.cno;
  65
  66         for (cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt > 0; cno = 0) {
  67                 /* SOF is an error, EOF is an infinite count sink. */
  68                 if (db_get(sp, lno, 0, &p, &len)) {
  69                         if (lno == 1) {
  70                                 v_emsg(sp, NULL, VIM_EMPTY);
  71                                 return (1);
  72                         }
  73                         --lno;
  74                         break;
  75                 }
  76
  77                 /* Empty lines decrement the count by one. */
  78                 if (len == 0) {
  79                         --cnt;
  80                         vp->m_final.cno = 0;
  81                         continue;
  82                 }
  83
  84                 if (cno + cnt >= len) {
  85                         lcnt = len - 1;
  86                         cnt -= len - cno;
  87
  88                         vp->m_final.cno = len - 1;
  89                 } else {
  90                         lcnt = cno + cnt - 1;
  91                         cnt = 0;
  92
  93                         vp->m_final.cno = lcnt + 1;
  94                 }
  95
  96                 if (ulcase(sp, lno, p, len, cno, lcnt))
  97                         return (1);
  98
  99                 if (cnt > 0)
 100                         ++lno;
 101         }
 102
 103         vp->m_final.lno = lno;
 104         return (0);
 105 }
 106
 107 /*
 108  * v_mulcase -- [count]~[count]motion
 109  *      Toggle upper & lower case letters over a range.
 110  *
 111  * PUBLIC: int v_mulcase __P((SCR *, VICMD *));
 112  */
 113 int
 114 v_mulcase(SCR *sp, VICMD *vp)
 115 {
 116         CHAR_T *p;
 117         size_t len;
 118         db_recno_t lno;
 119
 120         for (lno = vp->m_start.lno;;) {
 121                 if (db_get(sp, lno, DBG_FATAL, &p, &len))
 122                         return (1);
 123                 if (len != 0 && ulcase(sp, lno, p, len,
 124                     lno == vp->m_start.lno ? vp->m_start.cno : 0,
 125                     !F_ISSET(vp, VM_LMODE) &&
 126                     lno == vp->m_stop.lno ? vp->m_stop.cno : len))
 127                         return (1);
 128
 129                 if (++lno > vp->m_stop.lno)
 130                         break;
 131         }
 132
 133         /*
 134          * XXX
 135          * I didn't create a new motion command when I added motion semantics
 136          * for ~.  While that's the correct way to do it, that choice would
 137          * have required changes all over the vi directory for little gain.
 138          * Instead, we pretend it's a yank command.  Note, this means that we
 139          * follow the cursor motion rules for yank commands, but that seems
 140          * reasonable to me.
 141          */
 142         return (0);
 143 }
 144
 145 /*
 146  * ulcase --
 147  *      Change part of a line's case.
 148  */
 149 static int
 150 ulcase(SCR *sp, db_recno_t lno, CHAR_T *lp, size_t len, size_t scno, size_t ecno)
 151 {
 152         size_t blen;
 153         int change, rval;
 154         ARG_CHAR_T ch;
 155         CHAR_T *p, *t, *bp;
 156
 157         GET_SPACE_RETW(sp, bp, blen, len);
 158         MEMMOVEW(bp, lp, len);
 159
 160         change = rval = 0;
 161         for (p = bp + scno, t = bp + ecno + 1; p < t; ++p) {
 162                 ch = (UCHAR_T)*p;
 163                 if (ISLOWER(ch)) {
 164                         *p = TOUPPER(ch);
 165                         change = 1;
 166                 } else if (ISUPPER(ch)) {
 167                         *p = TOLOWER(ch);
 168                         change = 1;
 169                 }
 170         }
 171
 172         if (change && db_set(sp, lno, bp, len))
 173                 rval = 1;
 174
 175         FREE_SPACEW(sp, bp, blen);
 176         return (rval);
 177 }