vi/v_ulcase.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_ulcase.c,v 10.10 2000/07/15 20:26:36 skimo Exp $ (Berkeley) $Date: 2000/07/15 20:26:36 $";
  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 static int ulcase __P((SCR *, db_recno_t, CHAR_T *, size_t, size_t, size_t));
  32
  33 /*
  34  * v_ulcase -- [count]~
  35  *      Toggle upper & lower case letters.
  36  *
  37  * !!!
  38  * Historic vi didn't permit ~ to cross newline boundaries.  I can
  39  * think of no reason why it shouldn't, which at least lets the user
  40  * auto-repeat through a paragraph.
  41  *
  42  * !!!
  43  * In historic vi, the count was ignored.  It would have been better
  44  * if there had been an associated motion, but it's too late to make
  45  * that the default now.
  46  *
  47  * PUBLIC: int v_ulcase __P((SCR *, VICMD *));
  48  */
  49 int
  50 v_ulcase(sp, vp)
  51         SCR *sp;
  52         VICMD *vp;
  53 {
  54         db_recno_t lno;
  55         size_t cno, lcnt, len;
  56         u_long cnt;
  57         CHAR_T *p;
  58
  59         lno = vp->m_start.lno;
  60         cno = vp->m_start.cno;
  61
  62         for (cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt > 0; cno = 0) {
  63                 /* SOF is an error, EOF is an infinite count sink. */
  64                 if (db_get(sp, lno, 0, &p, &len)) {
  65                         if (lno == 1) {
  66                                 v_emsg(sp, NULL, VIM_EMPTY);
  67                                 return (1);
  68                         }
  69                         --lno;
  70                         break;
  71                 }
  72
  73                 /* Empty lines decrement the count by one. */
  74                 if (len == 0) {
  75                         --cnt;
  76                         vp->m_final.cno = 0;
  77                         continue;
  78                 }
  79
  80                 if (cno + cnt >= len) {
  81                         lcnt = len - 1;
  82                         cnt -= len - cno;
  83
  84                         vp->m_final.cno = len - 1;
  85                 } else {
  86                         lcnt = cno + cnt - 1;
  87                         cnt = 0;
  88
  89                         vp->m_final.cno = lcnt + 1;
  90                 }
  91
  92                 if (ulcase(sp, lno, p, len, cno, lcnt))
  93                         return (1);
  94
  95                 if (cnt > 0)
  96                         ++lno;
  97         }
  98
  99         vp->m_final.lno = lno;
 100         return (0);
 101 }
 102
 103 /*
 104  * v_mulcase -- [count]~[count]motion
 105  *      Toggle upper & lower case letters over a range.
 106  *
 107  * PUBLIC: int v_mulcase __P((SCR *, VICMD *));
 108  */
 109 int
 110 v_mulcase(sp, vp)
 111         SCR *sp;
 112         VICMD *vp;
 113 {
 114         CHAR_T *p;
 115         size_t len;
 116         db_recno_t lno;
 117
 118         for (lno = vp->m_start.lno;;) {
 119                 if (db_get(sp, lno, DBG_FATAL, &p, &len))
 120                         return (1);
 121                 if (len != 0 && ulcase(sp, lno, p, len,
 122                     lno == vp->m_start.lno ? vp->m_start.cno : 0,
 123                     !F_ISSET(vp, VM_LMODE) &&
 124                     lno == vp->m_stop.lno ? vp->m_stop.cno : len))
 125                         return (1);
 126
 127                 if (++lno > vp->m_stop.lno)
 128                         break;
 129         }
 130
 131         /*
 132          * XXX
 133          * I didn't create a new motion command when I added motion semantics
 134          * for ~.  While that's the correct way to do it, that choice would
 135          * have required changes all over the vi directory for little gain.
 136          * Instead, we pretend it's a yank command.  Note, this means that we
 137          * follow the cursor motion rules for yank commands, but that seems
 138          * reasonable to me.
 139          */
 140         return (0);
 141 }
 142
 143 /*
 144  * ulcase --
 145  *      Change part of a line's case.
 146  */
 147 static int
 148 ulcase(sp, lno, lp, len, scno, ecno)
 149         SCR *sp;
 150         db_recno_t lno;
 151         CHAR_T *lp;
 152         size_t len, scno, ecno;
 153 {
 154         size_t blen;
 155         int change, rval;
 156         CHAR_T ch, *p, *t;
 157         CHAR_T *bp;
 158
 159         GET_SPACE_RETW(sp, bp, blen, len);
 160         MEMMOVEW(bp, lp, len);
 161
 162         change = rval = 0;
 163         for (p = bp + scno, t = bp + ecno + 1; p < t; ++p) {
 164                 ch = *(u_char *)p;
 165                 if (islower(ch)) {
 166                         *p = toupper(ch);
 167                         change = 1;
 168                 } else if (isupper(ch)) {
 169                         *p = tolower(ch);
 170                         change = 1;
 171                 }
 172         }
 173
 174         if (change && db_set(sp, lno, bp, len))
 175                 rval = 1;
 176
 177         FREE_SPACEW(sp, bp, blen);
 178         return (rval);
 179 }