dist/nvi/vi/v_ulcase.c

   1 /*      $NetBSD: v_ulcase.c,v 1.1.1.2 2008/05/18 14:31:47 aymeric Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   7  *      Keith Bostic.  All rights reserved.
   8  *
   9  * See the LICENSE file for redistribution information.
  10  */
  11
  12 #include "config.h"
  13
  14 #ifndef lint
  15 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";
  16 #endif /* not lint */
  17
  18 #include <sys/types.h>
  19 #include <sys/queue.h>
  20 #include <sys/time.h>
  21
  22 #include <bitstring.h>
  23 #include <ctype.h>
  24 #include <errno.h>
  25 #include <limits.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "../common/common.h"
  31 #include "vi.h"
  32
  33 static int ulcase __P((SCR *, db_recno_t, CHAR_T *, size_t, size_t, size_t));
  34
  35 /*
  36  * v_ulcase -- [count]~
  37  *      Toggle upper & lower case letters.
  38  *
  39  * !!!
  40  * Historic vi didn't permit ~ to cross newline boundaries.  I can
  41  * think of no reason why it shouldn't, which at least lets the user
  42  * auto-repeat through a paragraph.
  43  *
  44  * !!!
  45  * In historic vi, the count was ignored.  It would have been better
  46  * if there had been an associated motion, but it's too late to make
  47  * that the default now.
  48  *
  49  * PUBLIC: int v_ulcase __P((SCR *, VICMD *));
  50  */
  51 int
  52 v_ulcase(SCR *sp, 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(SCR *sp, VICMD *vp)
 111 {
 112         CHAR_T *p;
 113         size_t len;
 114         db_recno_t lno;
 115
 116         for (lno = vp->m_start.lno;;) {
 117                 if (db_get(sp, lno, DBG_FATAL, &p, &len))
 118                         return (1);
 119                 if (len != 0 && ulcase(sp, lno, p, len,
 120                     lno == vp->m_start.lno ? vp->m_start.cno : 0,
 121                     !F_ISSET(vp, VM_LMODE) &&
 122                     lno == vp->m_stop.lno ? vp->m_stop.cno : len))
 123                         return (1);
 124
 125                 if (++lno > vp->m_stop.lno)
 126                         break;
 127         }
 128
 129         /*
 130          * XXX
 131          * I didn't create a new motion command when I added motion semantics
 132          * for ~.  While that's the correct way to do it, that choice would
 133          * have required changes all over the vi directory for little gain.
 134          * Instead, we pretend it's a yank command.  Note, this means that we
 135          * follow the cursor motion rules for yank commands, but that seems
 136          * reasonable to me.
 137          */
 138         return (0);
 139 }
 140
 141 /*
 142  * ulcase --
 143  *      Change part of a line's case.
 144  */
 145 static int
 146 ulcase(SCR *sp, db_recno_t lno, CHAR_T *lp, size_t len, size_t scno, size_t ecno)
 147 {
 148         size_t blen;
 149         int change, rval;
 150         CHAR_T ch, *p, *t;
 151         CHAR_T *bp;
 152
 153         GET_SPACE_RETW(sp, bp, blen, len);
 154         MEMMOVEW(bp, lp, len);
 155
 156         change = rval = 0;
 157         for (p = bp + scno, t = bp + ecno + 1; p < t; ++p) {
 158                 ch = *p;
 159                 if (ISLOWER(ch)) {
 160                         *p = TOUPPER(ch);
 161                         change = 1;
 162                 } else if (ISUPPER(ch)) {
 163                         *p = TOLOWER(ch);
 164                         change = 1;
 165                 }
 166         }
 167
 168         if (change && db_set(sp, lno, bp, len))
 169                 rval = 1;
 170
 171         FREE_SPACEW(sp, bp, blen);
 172         return (rval);
 173 }