summaryrefslogtreecommitdiffstats
path: root/usr.bin/more/output.c
blob: 38142db9352340e8d8f4b8ec8af211ca989c6f07 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/*
 * Copyright (c) 1988 Mark Nudleman
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)output.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

/*
 * High level routines dealing with the output to the screen.
 */

#include <stdio.h>
#include <less.h>

int errmsgs;	/* Count of messages displayed by error() */

extern int sigs;
extern int sc_width, sc_height;
extern int ul_width, ue_width;
extern int so_width, se_width;
extern int bo_width, be_width;
extern int tabstop;
extern int screen_trashed;
extern int any_display;
extern char *line;
extern int mode_flags;
static int last_pos_highlighted = 0;

/* display the line which is in the line buffer. */
put_line()
{
	register char *p;
	register int c;
	register int column;
	extern int auto_wrap, ignaw;

	if (sigs)
	{
		/*
		 * Don't output if a signal is pending.
		 */
		screen_trashed = 1;
		return;
	}

	if (line == NULL)
		line = "";

	if (last_pos_highlighted)
	{
		clear_eol();
		last_pos_highlighted = 0;
	}
	column = 0;
	for (p = line;  *p != '\0';  p++)
	{
		switch ((char)(c = (unsigned char)*p))
		{
		case UL_CHAR:
			ul_enter();
			column += ul_width;
			break;
		case UE_CHAR:
			ul_exit();
			column += ue_width;
			break;
		case BO_CHAR:
			bo_enter();
			column += bo_width;
			break;
		case BE_CHAR:
			bo_exit();
			column += be_width;
			break;
		case '\t':
			do
			{
				putchr(' ');
				column++;
			} while ((column % tabstop) != 0);
			break;
		case '\b':
			putbs();
			column--;
			break;
		default:
			if (c == 0200 || CONTROL_CHAR(c))
			{
				c &= ~0200;
				putchr('^');
				putchr(CARAT_CHAR(c));
				column += 2;
			} else
			{
				putchr(c);
				column++;
			}
		}
		if (column == sc_width && mode_flags)
			last_pos_highlighted = 1;
	}
	if (column < sc_width || !auto_wrap || ignaw)
		putchr('\n');
}

static char obuf[1024];
static char *ob = obuf;

/*
 * Flush buffered output.
 */
flush()
{
	register int n;

	n = ob - obuf;
	if (n == 0)
		return;
	if (write(1, obuf, n) != n)
		screen_trashed = 1;
	ob = obuf;
}

/*
 * Purge any pending output.
 */
purge()
{

	ob = obuf;
}

/*
 * Output a character.
 */
putchr(c)
	int c;
{
	if (ob >= &obuf[sizeof(obuf)])
		flush();
	*ob++ = c;
}

/*
 * Output a string.
 */
putstr(s)
	register char *s;
{
	while (*s != '\0')
		putchr(*s++);
}

int cmdstack;
static char return_to_continue[] = "(press RETURN)";

/*
 * Output a message in the lower left corner of the screen
 * and wait for carriage return.
 */
error(s)
	char *s;
{
	int ch;

	++errmsgs;
	if (!any_display) {
		/*
		 * Nothing has been displayed yet.  Output this message on
		 * error output (file descriptor 2) and don't wait for a
		 * keystroke to continue.
		 *
		 * This has the desirable effect of producing all error
		 * messages on error output if standard output is directed
		 * to a file.  It also does the same if we never produce
		 * any real output; for example, if the input file(s) cannot
		 * be opened.  If we do eventually produce output, code in
		 * edit() makes sure these messages can be seen before they
		 * are overwritten or scrolled away.
		 */
		(void)write(2, s, strlen(s));
		(void)write(2, "\n", 1);
		return;
	}

	lower_left();
	clear_eol();
	so_enter();
	if (s) {
		putstr(s);
		putstr("  ");
	}
	putstr(return_to_continue);
	so_exit();

	if ((ch = getchr()) != '\n') {
		if (ch == 'q')
			quit();
		cmdstack = ch;
	}
	lower_left();

	if ((s==NULL)?0:(strlen(s)) + sizeof(return_to_continue) + 
		so_width + se_width + 1 > sc_width)
		/*
		 * Printing the message has probably scrolled the screen.
		 * {{ Unless the terminal doesn't have auto margins,
		 *    in which case we just hammered on the right margin. }}
		 */
		repaint();
	flush();
}

static char intr_to_abort[] = "... (interrupt to abort)";

ierror(s)
	char *s;
{
	lower_left();
	clear_eol();
	so_enter();
	putstr(s);
	putstr(intr_to_abort);
	so_exit();
	flush();
}
OpenPOWER on IntegriCloud