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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/less/less/../jump.c	Lines:	23	92	25.0 %
Date:	2017-11-13	Branches:	7	62	11.3 %


/*
 * Copyright (C) 1984-2012  Mark Nudelman
 * Modified for use with illumos by Garrett D'Amore.
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information, see the README file.
 */

/*
 * Routines which jump to a new location in the file.
 */

#include "less.h"
#include "position.h"

extern int jump_sline;
extern int squished;
extern int screen_trashed;
extern int sc_width, sc_height;
extern int show_attn;
extern int top_scroll;

/*
 * Jump to the end of the file.
 */
void
jump_forw(void)
{
	off_t pos;
	off_t end_pos;

	if (ch_end_seek()) {
		error("Cannot seek to end of file", NULL);
		return;
	}
	/*
	 * Note; lastmark will be called later by jump_loc, but it fails
	 * because the position table has been cleared by pos_clear below.
	 * So call it here before calling pos_clear.
	 */
	lastmark();
	/*
	 * Position the last line in the file at the last screen line.
	 * Go back one line from the end of the file
	 * to get to the beginning of the last line.
	 */
	pos_clear();
	end_pos = ch_tell();
	pos = back_line(end_pos);
	if (pos == -1) {
		jump_loc(0, sc_height-1);
	} else {
		jump_loc(pos, sc_height-1);
		if (position(sc_height-1) != end_pos)
			repaint();
	}
}

/*
 * Jump to line n in the file.
 */
void
jump_back(off_t linenum)
{
	off_t pos;
	PARG parg;

	/*
	 * Find the position of the specified line.
	 * If we can seek there, just jump to it.
	 * If we can't seek, but we're trying to go to line number 1,
	 * use ch_beg_seek() to get as close as we can.
	 */
	pos = find_pos(linenum);
	if (pos != -1 && ch_seek(pos) == 0) {
		if (show_attn)
			set_attnpos(pos);
		jump_loc(pos, jump_sline);
	} else if (linenum <= 1 && ch_beg_seek() == 0) {
		jump_loc(ch_tell(), jump_sline);
		error("Cannot seek to beginning of file", NULL);
	} else {
		parg.p_linenum = linenum;
		error("Cannot seek to line number %n", &parg);
	}
}

/*
 * Repaint the screen.
 */
void
repaint(void)
{
	struct scrpos scrpos;
	/*
	 * Start at the line currently at the top of the screen
	 * and redisplay the screen.
	 */
	get_scrpos(&scrpos);
	pos_clear();
	jump_loc(scrpos.pos, scrpos.ln);
}

/*
 * Jump to a specified percentage into the file.
 */
void
jump_percent(int percent, long fraction)
{
	off_t pos, len;

	/*
	 * Determine the position in the file
	 * (the specified percentage of the file's length).
	 */
	if ((len = ch_length()) == -1) {
		ierror("Determining length of file", NULL);
		ch_end_seek();
	}
	if ((len = ch_length()) == -1) {
		error("Don't know length of file", NULL);
		return;
	}
	pos = percent_pos(len, percent, fraction);
	if (pos >= len)
		pos = len-1;

	jump_line_loc(pos, jump_sline);
}

/*
 * Jump to a specified position in the file.
 * Like jump_loc, but the position need not be
 * the first character in a line.
 */
void
jump_line_loc(off_t pos, int sline)
{
	int c;

	if (ch_seek(pos) == 0) {
		/*
		 * Back up to the beginning of the line.
		 */
		while ((c = ch_back_get()) != '\n' && c != EOI)
			;
		if (c == '\n')
			(void) ch_forw_get();
		pos = ch_tell();
	}
	if (show_attn)
		set_attnpos(pos);
	jump_loc(pos, sline);
}

/*
 * Jump to a specified position in the file.
 * The position must be the first character in a line.
 * Place the target line on a specified line on the screen.
 */
void
jump_loc(off_t pos, int sline)
{
	int nline;
	off_t tpos;
	off_t bpos;

	/*
	 * Normalize sline.
	 */
	sline = adjsline(sline);

	if ((nline = onscreen(pos)) >= 0) {
		/*
		 * The line is currently displayed.
		 * Just scroll there.
		 */
		nline -= sline;
		if (nline > 0)
			forw(nline, position(BOTTOM_PLUS_ONE), 1, 0, 0);
		else
			back(-nline, position(TOP), 1, 0);
		if (show_attn)
			repaint_hilite(1);
		return;
	}

	/*
	 * Line is not on screen.
	 * Seek to the desired location.
	 */
	if (ch_seek(pos)) {
		error("Cannot seek to that file position", NULL);
		return;
	}

	/*
	 * See if the desired line is before or after
	 * the currently displayed screen.
	 */
	tpos = position(TOP);
	bpos = position(BOTTOM_PLUS_ONE);
	if (tpos == -1 || pos >= tpos) {
		/*
		 * The desired line is after the current screen.
		 * Move back in the file far enough so that we can
		 * call forw() and put the desired line at the
		 * sline-th line on the screen.
		 */
		for (nline = 0; nline < sline; nline++) {
			if (bpos != -1 && pos <= bpos) {
				/*
				 * Surprise!  The desired line is
				 * close enough to the current screen
				 * that we can just scroll there after all.
				 */
				forw(sc_height-sline+nline-1, bpos, 1, 0, 0);
				if (show_attn)
					repaint_hilite(1);
				return;
			}
			pos = back_line(pos);
			if (pos == -1) {
				/*
				 * Oops.  Ran into the beginning of the file.
				 * Exit the loop here and rely on forw()
				 * below to draw the required number of
				 * blank lines at the top of the screen.
				 */
				break;
			}
		}
		lastmark();
		squished = 0;
		screen_trashed = 0;
		forw(sc_height-1, pos, 1, 0, sline-nline);
	} else {
		/*
		 * The desired line is before the current screen.
		 * Move forward in the file far enough so that we
		 * can call back() and put the desired line at the
		 * sline-th line on the screen.
		 */
		for (nline = sline; nline < sc_height - 1; nline++) {
			pos = forw_line(pos);
			if (pos == -1) {
				/*
				 * Ran into end of file.
				 * This shouldn't normally happen,
				 * but may if there is some kind of read error.
				 */
				break;
			}
			if (pos >= tpos) {
				/*
				 * Surprise!  The desired line is
				 * close enough to the current screen
				 * that we can just scroll there after all.
				 */
				back(nline + 1, tpos, 1, 0);
				if (show_attn)
					repaint_hilite(1);
				return;
			}
		}
		lastmark();
		if (!top_scroll)
			do_clear();
		else
			home();
		screen_trashed = 0;
		add_back_pos(pos);
		back(sc_height-1, pos, 1, 0);
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/*
2			* Copyright (C) 1984-2012 Mark Nudelman
3			* Modified for use with illumos by Garrett D'Amore.
4			* Copyright 2014 Garrett D'Amore <garrett@damore.org>
5			*
6			* You may distribute under the terms of either the GNU General Public
7			* License or the Less License, as specified in the README file.
8			*
9			* For more information, see the README file.
10			*/
11
12			/*
13			* Routines which jump to a new location in the file.
14			*/
15
16			#include "less.h"
17			#include "position.h"
18
19			extern int jump_sline;
20			extern int squished;
21			extern int screen_trashed;
22			extern int sc_width, sc_height;
23			extern int show_attn;
24			extern int top_scroll;
25
26			/*
27			* Jump to the end of the file.
28			*/
29			void
30			jump_forw(void)
31			{
32			off_t pos;
33			off_t end_pos;
34
35			if (ch_end_seek()) {
36			error("Cannot seek to end of file", NULL);
37			return;
38			}
39			/*
40			* Note; lastmark will be called later by jump_loc, but it fails
41			* because the position table has been cleared by pos_clear below.
42			* So call it here before calling pos_clear.
43			*/
44			lastmark();
45			/*
46			* Position the last line in the file at the last screen line.
47			* Go back one line from the end of the file
48			* to get to the beginning of the last line.
49			*/
50			pos_clear();
51			end_pos = ch_tell();
52			pos = back_line(end_pos);
53			if (pos == -1) {
54			jump_loc(0, sc_height-1);
55			} else {
56			jump_loc(pos, sc_height-1);
57			if (position(sc_height-1) != end_pos)
58			repaint();
59			}
60			}
61
62			/*
63			* Jump to line n in the file.
64			*/
65			void
66			jump_back(off_t linenum)
67			{
68			off_t pos;
69			PARG parg;
70
71			/*
72			* Find the position of the specified line.
73			* If we can seek there, just jump to it.
74			* If we can't seek, but we're trying to go to line number 1,
75			* use ch_beg_seek() to get as close as we can.
76			*/
77			pos = find_pos(linenum);
78			if (pos != -1 && ch_seek(pos) == 0) {
79			if (show_attn)
80			set_attnpos(pos);
81			jump_loc(pos, jump_sline);
82			} else if (linenum <= 1 && ch_beg_seek() == 0) {
83			jump_loc(ch_tell(), jump_sline);
84			error("Cannot seek to beginning of file", NULL);
85			} else {
86			parg.p_linenum = linenum;
87			error("Cannot seek to line number %n", &parg);
88			}
89			}
90
91			/*
92			* Repaint the screen.
93			*/
94			void
95			repaint(void)
96			{
97		14	struct scrpos scrpos;
98			/*
99			* Start at the line currently at the top of the screen
100			* and redisplay the screen.
101			*/
102		7	get_scrpos(&scrpos);
103		7	pos_clear();
104		7	jump_loc(scrpos.pos, scrpos.ln);
105		7	}
106
107			/*
108			* Jump to a specified percentage into the file.
109			*/
110			void
111			jump_percent(int percent, long fraction)
112			{
113			off_t pos, len;
114
115			/*
116			* Determine the position in the file
117			* (the specified percentage of the file's length).
118			*/
119			if ((len = ch_length()) == -1) {
120			ierror("Determining length of file", NULL);
121			ch_end_seek();
122			}
123			if ((len = ch_length()) == -1) {
124			error("Don't know length of file", NULL);
125			return;
126			}
127			pos = percent_pos(len, percent, fraction);
128			if (pos >= len)
129			pos = len-1;
130
131			jump_line_loc(pos, jump_sline);
132			}
133
134			/*
135			* Jump to a specified position in the file.
136			* Like jump_loc, but the position need not be
137			* the first character in a line.
138			*/
139			void
140			jump_line_loc(off_t pos, int sline)
141			{
142			int c;
143
144			if (ch_seek(pos) == 0) {
145			/*
146			* Back up to the beginning of the line.
147			*/
148			while ((c = ch_back_get()) != '\n' && c != EOI)
149			;
150			if (c == '\n')
151			(void) ch_forw_get();
152			pos = ch_tell();
153			}
154			if (show_attn)
155			set_attnpos(pos);
156			jump_loc(pos, sline);
157			}
158
159			/*
160			* Jump to a specified position in the file.
161			* The position must be the first character in a line.
162			* Place the target line on a specified line on the screen.
163			*/
164			void
165			jump_loc(off_t pos, int sline)
166			{
167			int nline;
168			off_t tpos;
169			off_t bpos;
170
171			/*
172			* Normalize sline.
173			*/
174		32	sline = adjsline(sline);
175
176	✓✓	16	if ((nline = onscreen(pos)) >= 0) {
177			/*
178			* The line is currently displayed.
179			* Just scroll there.
180			*/
181		1	nline -= sline;
182	✓✗	1	if (nline > 0)
183		1	forw(nline, position(BOTTOM_PLUS_ONE), 1, 0, 0);
184			else
185			back(-nline, position(TOP), 1, 0);
186	✗✓	1	if (show_attn)
187			repaint_hilite(1);
188		1	return;
189			}
190
191			/*
192			* Line is not on screen.
193			* Seek to the desired location.
194			*/
195	✗✓	15	if (ch_seek(pos)) {
196			error("Cannot seek to that file position", NULL);
197			return;
198			}
199
200			/*
201			* See if the desired line is before or after
202			* the currently displayed screen.
203			*/
204		15	tpos = position(TOP);
205		15	bpos = position(BOTTOM_PLUS_ONE);
206	✗✓✗✗	15	if (tpos == -1 \|\| pos >= tpos) {
207			/*
208			* The desired line is after the current screen.
209			* Move back in the file far enough so that we can
210			* call forw() and put the desired line at the
211			* sline-th line on the screen.
212			*/
213	✗✓	30	for (nline = 0; nline < sline; nline++) {
214			if (bpos != -1 && pos <= bpos) {
215			/*
216			* Surprise! The desired line is
217			* close enough to the current screen
218			* that we can just scroll there after all.
219			*/
220			forw(sc_height-sline+nline-1, bpos, 1, 0, 0);
221			if (show_attn)
222			repaint_hilite(1);
223			return;
224			}
225			pos = back_line(pos);
226			if (pos == -1) {
227			/*
228			* Oops. Ran into the beginning of the file.
229			* Exit the loop here and rely on forw()
230			* below to draw the required number of
231			* blank lines at the top of the screen.
232			*/
233			break;
234			}
235			}
236		15	lastmark();
237		15	squished = 0;
238		15	screen_trashed = 0;
239		15	forw(sc_height-1, pos, 1, 0, sline-nline);
240		15	} else {
241			/*
242			* The desired line is before the current screen.
243			* Move forward in the file far enough so that we
244			* can call back() and put the desired line at the
245			* sline-th line on the screen.
246			*/
247			for (nline = sline; nline < sc_height - 1; nline++) {
248			pos = forw_line(pos);
249			if (pos == -1) {
250			/*
251			* Ran into end of file.
252			* This shouldn't normally happen,
253			* but may if there is some kind of read error.
254			*/
255			break;
256			}
257			if (pos >= tpos) {
258			/*
259			* Surprise! The desired line is
260			* close enough to the current screen
261			* that we can just scroll there after all.
262			*/
263			back(nline + 1, tpos, 1, 0);
264			if (show_attn)
265			repaint_hilite(1);
266			return;
267			}
268			}
269			lastmark();
270			if (!top_scroll)
271			do_clear();
272			else
273			home();
274			screen_trashed = 0;
275			add_back_pos(pos);
276			back(sc_height-1, pos, 1, 0);
277			}
278		31	}