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 10.11 2001/06/25 15:19:36 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:36 $";
  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(SCR *sp, VICMD *vp)
  51 {
  52         db_recno_t lno;
  53         size_t cno, lcnt, len;
  54         u_long cnt;
  55         CHAR_T *p;
  56
  57         lno = vp->m_start.lno;
  58         cno = vp->m_start.cno;
  59
  60         for (cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt > 0; cno = 0) {
  61                 /* SOF is an error, EOF is an infinite count sink. */
  62                 if (db_get(sp, lno, 0, &p, &len)) {
  63                         if (lno == 1) {
  64                                 v_emsg(sp, NULL, VIM_EMPTY);
  65                                 return (1);
  66                         }
  67                         --lno;
  68                         break;
  69                 }
  70
  71                 /* Empty lines decrement the count by one. */
  72                 if (len == 0) {
  73                         --cnt;
  74                         vp->m_final.cno = 0;
  75                         continue;
  76                 }
  77
  78                 if (cno + cnt >= len) {
  79                         lcnt = len - 1;
  80                         cnt -= len - cno;
  81
  82                         vp->m_final.cno = len - 1;
  83                 } else {
  84                         lcnt = cno + cnt - 1;
  85                         cnt = 0;
  86
  87                         vp->m_final.cno = lcnt + 1;
  88                 }
  89
  90                 if (ulcase(sp, lno, p, len, cno, lcnt))
  91                         return (1);
  92
  93                 if (cnt > 0)
  94                         ++lno;
  95         }
  96
  97         vp->m_final.lno = lno;
  98         return (0);
  99 }
 100
 101 /*
 102  * v_mulcase -- [count]~[count]motion
 103  *      Toggle upper & lower case letters over a range.
 104  *
 105  * PUBLIC: int v_mulcase __P((SCR *, VICMD *));
 106  */
 107 int
 108 v_mulcase(SCR *sp, VICMD *vp)
 109 {
 110         CHAR_T *p;
 111         size_t len;
 112         db_recno_t lno;
 113
 114         for (lno = vp->m_start.lno;;) {
 115                 if (db_get(sp, lno, DBG_FATAL, &p, &len))
 116                         return (1);
 117                 if (len != 0 && ulcase(sp, lno, p, len,
 118                     lno == vp->m_start.lno ? vp->m_start.cno : 0,
 119                     !F_ISSET(vp, VM_LMODE) &&
 120                     lno == vp->m_stop.lno ? vp->m_stop.cno : len))
 121                         return (1);
 122
 123                 if (++lno > vp->m_stop.lno)
 124                         break;
 125         }
 126
 127         /*
 128          * XXX
 129          * I didn't create a new motion command when I added motion semantics
 130          * for ~.  While that's the correct way to do it, that choice would
 131          * have required changes all over the vi directory for little gain.
 132          * Instead, we pretend it's a yank command.  Note, this means that we
 133          * follow the cursor motion rules for yank commands, but that seems
 134          * reasonable to me.
 135          */
 136         return (0);
 137 }
 138
 139 /*
 140  * ulcase --
 141  *      Change part of a line's case.
 142  */
 143 static int
 144 ulcase(SCR *sp, db_recno_t lno, CHAR_T *lp, size_t len, size_t scno, size_t ecno)
 145 {
 146         size_t blen;
 147         int change, rval;
 148         CHAR_T ch, *p, *t;
 149         CHAR_T *bp;
 150
 151         GET_SPACE_RETW(sp, bp, blen, len);
 152         MEMMOVEW(bp, lp, len);
 153
 154         change = rval = 0;
 155         for (p = bp + scno, t = bp + ecno + 1; p < t; ++p) {
 156                 ch = *(u_char *)p;
 157                 if (islower(ch)) {
 158                         *p = toupper(ch);
 159                         change = 1;
 160                 } else if (isupper(ch)) {
 161                         *p = tolower(ch);
 162                         change = 1;
 163                 }
 164         }
 165
 166         if (change && db_set(sp, lno, bp, len))
 167                 rval = 1;
 168
 169         FREE_SPACEW(sp, bp, blen);
 170         return (rval);
 171 }