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
16static 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
37static 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 */
55int
56v_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 */
113int
114v_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 */
149static int
150ulcase(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}
178