Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/less/less/../input.c	Lines:	111	169	65.7 %
Date:	2017-11-07	Branches:	69	114	60.5 %


/*
 * 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.
 */

/*
 * High level routines dealing with getting lines of input
 * from the file being viewed.
 *
 * When we speak of "lines" here, we mean PRINTABLE lines;
 * lines processed with respect to the screen width.
 * We use the term "raw line" to refer to lines simply
 * delimited by newlines; not processed with respect to screen width.
 */

#include "less.h"

extern int squeeze;
extern int chopline;
extern int hshift;
extern int quit_if_one_screen;
extern volatile sig_atomic_t sigs;
extern int ignore_eoi;
extern int status_col;
extern off_t start_attnpos;
extern off_t end_attnpos;
extern int hilite_search;
extern int size_linebuf;

/*
 * Get the next line.
 * A "current" position is passed and a "new" position is returned.
 * The current position is the position of the first character of
 * a line.  The new position is the position of the first character
 * of the NEXT line.  The line obtained is the line starting at curr_pos.
 */
off_t
forw_line(off_t curr_pos)
{
	off_t base_pos;
	off_t new_pos;
	int c;
	int blankline;
	int endline;
	int backchars;

get_forw_line:
	if (curr_pos == -1) {
		null_line();
		return (-1);
	}
	if (hilite_search == OPT_ONPLUS || is_filtering() || status_col)
		/*
		 * If we are ignoring EOI (command F), only prepare
		 * one line ahead, to avoid getting stuck waiting for
		 * slow data without displaying the data we already have.
		 * If we're not ignoring EOI, we *could* do the same, but
		 * for efficiency we prepare several lines ahead at once.
		 */
		prep_hilite(curr_pos, curr_pos + 3*size_linebuf,
		    ignore_eoi ? 1 : -1);
	if (ch_seek(curr_pos)) {
		null_line();
		return (-1);
	}

	/*
	 * Step back to the beginning of the line.
	 */
	base_pos = curr_pos;
	for (;;) {
		if (ABORT_SIGS()) {
			null_line();
			return (-1);
		}
		c = ch_back_get();
		if (c == EOI)
			break;
		if (c == '\n') {
			(void) ch_forw_get();
			break;
		}
		--base_pos;
	}

	/*
	 * Read forward again to the position we should start at.
	 */
	prewind();
	plinenum(base_pos);
	(void) ch_seek(base_pos);
	new_pos = base_pos;
	while (new_pos < curr_pos) {
		if (ABORT_SIGS()) {
			null_line();
			return (-1);
		}
		c = ch_forw_get();
		backchars = pappend(c, new_pos);
		new_pos++;
		if (backchars > 0) {
			pshift_all();
			new_pos -= backchars;
			while (--backchars >= 0)
				(void) ch_back_get();
		}
	}
	(void) pflushmbc();
	pshift_all();

	/*
	 * Read the first character to display.
	 */
	c = ch_forw_get();
	if (c == EOI) {
		null_line();
		return (-1);
	}
	blankline = (c == '\n' || c == '\r');

	/*
	 * Read each character in the line and append to the line buffer.
	 */
	for (;;) {
		if (ABORT_SIGS()) {
			null_line();
			return (-1);
		}
		if (c == '\n' || c == EOI) {
			/*
			 * End of the line.
			 */
			backchars = pflushmbc();
			new_pos = ch_tell();
			if (backchars > 0 && !chopline && hshift == 0) {
				new_pos -= backchars + 1;
				endline = FALSE;
			} else
				endline = TRUE;
			break;
		}
		if (c != '\r')
			blankline = 0;

		/*
		 * Append the char to the line and get the next char.
		 */
		backchars = pappend(c, ch_tell()-1);
		if (backchars > 0) {
			/*
			 * The char won't fit in the line; the line
			 * is too long to print in the screen width.
			 * End the line here.
			 */
			if (chopline || hshift > 0) {
				do {
					if (ABORT_SIGS()) {
						null_line();
						return (-1);
					}
					c = ch_forw_get();
				} while (c != '\n' && c != EOI);
				new_pos = ch_tell();
				endline = TRUE;
				quit_if_one_screen = FALSE;
			} else {
				new_pos = ch_tell() - backchars;
				endline = FALSE;
			}
			break;
		}
		c = ch_forw_get();
	}

	pdone(endline, 1);

	if (is_filtered(base_pos)) {
		/*
		 * We don't want to display this line.
		 * Get the next line.
		 */
		curr_pos = new_pos;
		goto get_forw_line;
	}

	if (status_col && is_hilited(base_pos, ch_tell()-1, 1, NULL))
		set_status_col('*');

	if (squeeze && blankline) {
		/*
		 * This line is blank.
		 * Skip down to the last contiguous blank line
		 * and pretend it is the one which we are returning.
		 */
		while ((c = ch_forw_get()) == '\n' || c == '\r')
			if (ABORT_SIGS()) {
				null_line();
				return (-1);
			}
		if (c != EOI)
			(void) ch_back_get();
		new_pos = ch_tell();
	}

	return (new_pos);
}

/*
 * Get the previous line.
 * A "current" position is passed and a "new" position is returned.
 * The current position is the position of the first character of
 * a line.  The new position is the position of the first character
 * of the PREVIOUS line.  The line obtained is the one starting at new_pos.
 */
off_t
back_line(off_t curr_pos)
{
	off_t new_pos, begin_new_pos, base_pos;
	int c;
	int endline;
	int backchars;

get_back_line:
	if (curr_pos == -1 || curr_pos <= ch_zero()) {
		null_line();
		return (-1);
	}
	if (hilite_search == OPT_ONPLUS || is_filtering() || status_col)
		prep_hilite((curr_pos < 3*size_linebuf) ?
		    0 : curr_pos - 3*size_linebuf, curr_pos, -1);
	if (ch_seek(curr_pos-1)) {
		null_line();
		return (-1);
	}

	if (squeeze) {
		/*
		 * Find out if the "current" line was blank.
		 */
		(void) ch_forw_get();	/* Skip the newline */
		c = ch_forw_get();	/* First char of "current" line */
		(void) ch_back_get();	/* Restore our position */
		(void) ch_back_get();

		if (c == '\n' || c == '\r') {
			/*
			 * The "current" line was blank.
			 * Skip over any preceding blank lines,
			 * since we skipped them in forw_line().
			 */
			while ((c = ch_back_get()) == '\n' || c == '\r')
				if (ABORT_SIGS()) {
					null_line();
					return (-1);
				}
			if (c == EOI) {
				null_line();
				return (-1);
			}
			(void) ch_forw_get();
		}
	}

	/*
	 * Scan backwards until we hit the beginning of the line.
	 */
	for (;;) {
		if (ABORT_SIGS()) {
			null_line();
			return (-1);
		}
		c = ch_back_get();
		if (c == '\n') {
			/*
			 * This is the newline ending the previous line.
			 * We have hit the beginning of the line.
			 */
			base_pos = ch_tell() + 1;
			break;
		}
		if (c == EOI) {
			/*
			 * We have hit the beginning of the file.
			 * This must be the first line in the file.
			 * This must, of course, be the beginning of the line.
			 */
			base_pos = ch_tell();
			break;
		}
	}

	/*
	 * Now scan forwards from the beginning of this line.
	 * We keep discarding "printable lines" (based on screen width)
	 * until we reach the curr_pos.
	 *
	 * {{ This algorithm is pretty inefficient if the lines
	 *    are much longer than the screen width,
	 *    but I don't know of any better way. }}
	 */
	new_pos = base_pos;
	if (ch_seek(new_pos)) {
		null_line();
		return (-1);
	}
	endline = FALSE;
	prewind();
	plinenum(new_pos);
loop:
	begin_new_pos = new_pos;
	(void) ch_seek(new_pos);

	do {
		c = ch_forw_get();
		if (c == EOI || ABORT_SIGS()) {
			null_line();
			return (-1);
		}
		new_pos++;
		if (c == '\n') {
			backchars = pflushmbc();
			if (backchars > 0 && !chopline && hshift == 0) {
				backchars++;
				goto shift;
			}
			endline = TRUE;
			break;
		}
		backchars = pappend(c, ch_tell()-1);
		if (backchars > 0) {
			/*
			 * Got a full printable line, but we haven't
			 * reached our curr_pos yet.  Discard the line
			 * and start a new one.
			 */
			if (chopline || hshift > 0) {
				endline = TRUE;
				quit_if_one_screen = FALSE;
				break;
			}
		shift:
			pshift_all();
			while (backchars-- > 0) {
				(void) ch_back_get();
				new_pos--;
			}
			goto loop;
		}
	} while (new_pos < curr_pos);

	pdone(endline, 0);

	if (is_filtered(base_pos)) {
		/*
		 * We don't want to display this line.
		 * Get the previous line.
		 */
		curr_pos = begin_new_pos;
		goto get_back_line;
	}

	if (status_col && curr_pos > 0 &&
	    is_hilited(base_pos, curr_pos-1, 1, NULL))
		set_status_col('*');

	return (begin_new_pos);
}

/*
 * Set attnpos.
 */
void
set_attnpos(off_t pos)
{
	int c;

	if (pos != -1) {
		if (ch_seek(pos))
			return;
		for (;;) {
			c = ch_forw_get();
			if (c == EOI)
				return;
			if (c != '\n' && c != '\r')
				break;
			pos++;
		}
	}
	start_attnpos = pos;
	for (;;) {
		c = ch_forw_get();
		pos++;
		if (c == EOI || c == '\n' || c == '\r')
			break;
	}
	end_attnpos = pos;
}


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			* High level routines dealing with getting lines of input
14			* from the file being viewed.
15			*
16			* When we speak of "lines" here, we mean PRINTABLE lines;
17			* lines processed with respect to the screen width.
18			* We use the term "raw line" to refer to lines simply
19			* delimited by newlines; not processed with respect to screen width.
20			*/
21
22			#include "less.h"
23
24			extern int squeeze;
25			extern int chopline;
26			extern int hshift;
27			extern int quit_if_one_screen;
28			extern volatile sig_atomic_t sigs;
29			extern int ignore_eoi;
30			extern int status_col;
31			extern off_t start_attnpos;
32			extern off_t end_attnpos;
33			extern int hilite_search;
34			extern int size_linebuf;
35
36			/*
37			* Get the next line.
38			* A "current" position is passed and a "new" position is returned.
39			* The current position is the position of the first character of
40			* a line. The new position is the position of the first character
41			* of the NEXT line. The line obtained is the line starting at curr_pos.
42			*/
43			off_t
44			forw_line(off_t curr_pos)
45			{
46			off_t base_pos;
47			off_t new_pos;
48			int c;
49			int blankline;
50			int endline;
51		50322	int backchars;
52
53			get_forw_line:
54	✓✓	25161	if (curr_pos == -1) {
55		154	null_line();
56		154	return (-1);
57			}
58	✓✓✗✓	26090	if (hilite_search == OPT_ONPLUS \|\| is_filtering() \|\| status_col)
59			/*
60			* If we are ignoring EOI (command F), only prepare
61			* one line ahead, to avoid getting stuck waiting for
62			* slow data without displaying the data we already have.
63			* If we're not ignoring EOI, we could do the same, but
64			* for efficiency we prepare several lines ahead at once.
65			*/
66		47848	prep_hilite(curr_pos, curr_pos + 3*size_linebuf,
67		23924	ignore_eoi ? 1 : -1);
68	✗✓	25007	if (ch_seek(curr_pos)) {
69			null_line();
70			return (-1);
71			}
72
73			/*
74			* Step back to the beginning of the line.
75			*/
76			base_pos = curr_pos;
77		2390961	for (;;) {
78	✗✓	2390961	if (ABORT_SIGS()) {
79			null_line();
80			return (-1);
81			}
82		2390961	c = ch_back_get();
83	✓✓	2390961	if (c == EOI)
84			break;
85	✓✓	2390917	if (c == '\n') {
86		24963	(void) ch_forw_get();
87		24963	break;
88			}
89		2365954	--base_pos;
90			}
91
92			/*
93			* Read forward again to the position we should start at.
94			*/
95		25007	prewind();
96		25007	plinenum(base_pos);
97		25007	(void) ch_seek(base_pos);
98			new_pos = base_pos;
99	✓✓	2428255	while (new_pos < curr_pos) {
100	✗✓	2378241	if (ABORT_SIGS()) {
101			null_line();
102			return (-1);
103			}
104		2378241	c = ch_forw_get();
105		2378241	backchars = pappend(c, new_pos);
106		2378241	new_pos++;
107	✓✓	2378241	if (backchars > 0) {
108		12287	pshift_all();
109		12287	new_pos -= backchars;
110	✓✓	49148	while (--backchars >= 0)
111		12287	(void) ch_back_get();
112			}
113			}
114		25007	(void) pflushmbc();
115		25007	pshift_all();
116
117			/*
118			* Read the first character to display.
119			*/
120		25007	c = ch_forw_get();
121	✓✓	25007	if (c == EOI) {
122		19	null_line();
123		19	return (-1);
124			}
125		24988	blankline = (c == '\n' \|\| c == '\r');
126
127			/*
128			* Read each character in the line and append to the line buffer.
129			*/
130		1668041	for (;;) {
131	✗✓	1668041	if (ABORT_SIGS()) {
132			null_line();
133			return (-1);
134			}
135	✓✓	1668041	if (c == '\n' \|\| c == EOI) {
136			/*
137			* End of the line.
138			*/
139		19877	backchars = pflushmbc();
140		19877	new_pos = ch_tell();
141	✗✓	19877	if (backchars > 0 && !chopline && hshift == 0) {
142			new_pos -= backchars + 1;
143			endline = FALSE;
144			} else
145			endline = TRUE;
146			break;
147			}
148	✓✓	1648164	if (c != '\r')
149		1648162	blankline = 0;
150
151			/*
152			* Append the char to the line and get the next char.
153			*/
154		1648164	backchars = pappend(c, ch_tell()-1);
155	✓✓	1648164	if (backchars > 0) {
156			/*
157			* The char won't fit in the line; the line
158			* is too long to print in the screen width.
159			* End the line here.
160			*/
161	✗✓	5111	if (chopline \|\| hshift > 0) {
162			do {
163			if (ABORT_SIGS()) {
164			null_line();
165			return (-1);
166			}
167			c = ch_forw_get();
168			} while (c != '\n' && c != EOI);
169			new_pos = ch_tell();
170			endline = TRUE;
171			quit_if_one_screen = FALSE;
172			} else {
173		5111	new_pos = ch_tell() - backchars;
174			endline = FALSE;
175			}
176			break;
177			}
178		1643053	c = ch_forw_get();
179			}
180
181		24988	pdone(endline, 1);
182
183	✗✓	24988	if (is_filtered(base_pos)) {
184			/*
185			* We don't want to display this line.
186			* Get the next line.
187			*/
188			curr_pos = new_pos;
189			goto get_forw_line;
190			}
191
192	✗✓✗✗	24988	if (status_col && is_hilited(base_pos, ch_tell()-1, 1, NULL))
193			set_status_col('*');
194
195	✓✓	24988	if (squeeze && blankline) {
196			/*
197			* This line is blank.
198			* Skip down to the last contiguous blank line
199			* and pretend it is the one which we are returning.
200			*/
201	✗✓	235	while ((c = ch_forw_get()) == '\n' \|\| c == '\r')
202			if (ABORT_SIGS()) {
203			null_line();
204			return (-1);
205			}
206	✓✗	235	if (c != EOI)
207		235	(void) ch_back_get();
208		235	new_pos = ch_tell();
209		235	}
210
211		24988	return (new_pos);
212		25161	}
213
214			/*
215			* Get the previous line.
216			* A "current" position is passed and a "new" position is returned.
217			* The current position is the position of the first character of
218			* a line. The new position is the position of the first character
219			* of the PREVIOUS line. The line obtained is the one starting at new_pos.
220			*/
221			off_t
222			back_line(off_t curr_pos)
223			{
224			off_t new_pos, begin_new_pos, base_pos;
225			int c;
226			int endline;
227		5602	int backchars;
228
229			get_back_line:
230	✓✓	2801	if (curr_pos == -1 \|\| curr_pos <= ch_zero()) {
231		26	null_line();
232		26	return (-1);
233			}
234	✓✓✗✓	2880	if (hilite_search == OPT_ONPLUS \|\| is_filtering() \|\| status_col)
235	✓✓	7751	prep_hilite((curr_pos < 3*size_linebuf) ?
236		2411	0 : curr_pos - 3*size_linebuf, curr_pos, -1);
237	✗✓	2775	if (ch_seek(curr_pos-1)) {
238			null_line();
239			return (-1);
240			}
241
242	✓✓	2775	if (squeeze) {
243			/*
244			* Find out if the "current" line was blank.
245			*/
246		105	(void) ch_forw_get(); /* Skip the newline */
247		105	c = ch_forw_get(); /* First char of "current" line */
248		105	(void) ch_back_get(); /* Restore our position */
249		105	(void) ch_back_get();
250
251	✓✓	105	if (c == '\n' \|\| c == '\r') {
252			/*
253			* The "current" line was blank.
254			* Skip over any preceding blank lines,
255			* since we skipped them in forw_line().
256			*/
257	✗✓	33	while ((c = ch_back_get()) == '\n' \|\| c == '\r')
258			if (ABORT_SIGS()) {
259			null_line();
260			return (-1);
261			}
262	✗✓	33	if (c == EOI) {
263			null_line();
264			return (-1);
265			}
266		33	(void) ch_forw_get();
267		33	}
268			}
269
270			/*
271			* Scan backwards until we hit the beginning of the line.
272			*/
273			for (;;) {
274	✗✓	101155	if (ABORT_SIGS()) {
275			null_line();
276			return (-1);
277			}
278		101155	c = ch_back_get();
279	✓✓	101155	if (c == '\n') {
280			/*
281			* This is the newline ending the previous line.
282			* We have hit the beginning of the line.
283			*/
284		2770	base_pos = ch_tell() + 1;
285		2770	break;
286			}
287	✓✓	98385	if (c == EOI) {
288			/*
289			* We have hit the beginning of the file.
290			* This must be the first line in the file.
291			* This must, of course, be the beginning of the line.
292			*/
293		5	base_pos = ch_tell();
294		5	break;
295			}
296			}
297
298			/*
299			* Now scan forwards from the beginning of this line.
300			* We keep discarding "printable lines" (based on screen width)
301			* until we reach the curr_pos.
302			*
303			* {{ This algorithm is pretty inefficient if the lines
304			* are much longer than the screen width,
305			* but I don't know of any better way. }}
306			*/
307			new_pos = base_pos;
308	✗✓	2775	if (ch_seek(new_pos)) {
309			null_line();
310			return (-1);
311			}
312			endline = FALSE;
313		2775	prewind();
314		2775	plinenum(new_pos);
315			loop:
316			begin_new_pos = new_pos;
317		2798	(void) ch_seek(new_pos);
318
319		2798	do {
320		101178	c = ch_forw_get();
321	✓✗✗✓	202356	if (c == EOI \|\| ABORT_SIGS()) {
322			null_line();
323			return (-1);
324			}
325		101178	new_pos++;
326	✓✓	101178	if (c == '\n') {
327		2751	backchars = pflushmbc();
328	✗✓	2751	if (backchars > 0 && !chopline && hshift == 0) {
329			backchars++;
330			goto shift;
331			}
332			endline = TRUE;
333		2751	break;
334			}
335		98427	backchars = pappend(c, ch_tell()-1);
336	✓✓	98427	if (backchars > 0) {
337			/*
338			* Got a full printable line, but we haven't
339			* reached our curr_pos yet. Discard the line
340			* and start a new one.
341			*/
342	✗✓	23	if (chopline \|\| hshift > 0) {
343			endline = TRUE;
344			quit_if_one_screen = FALSE;
345			break;
346			}
347			shift:
348		23	pshift_all();
349	✓✓	92	while (backchars-- > 0) {
350		23	(void) ch_back_get();
351		23	new_pos--;
352			}
353			goto loop;
354			}
355	✓✓	98404	} while (new_pos < curr_pos);
356
357		2775	pdone(endline, 0);
358
359	✗✓	2775	if (is_filtered(base_pos)) {
360			/*
361			* We don't want to display this line.
362			* Get the previous line.
363			*/
364			curr_pos = begin_new_pos;
365			goto get_back_line;
366			}
367
368	✗✓✗✗	2775	if (status_col && curr_pos > 0 &&
369			is_hilited(base_pos, curr_pos-1, 1, NULL))
370			set_status_col('*');
371
372		2775	return (begin_new_pos);
373		2801	}
374
375			/*
376			* Set attnpos.
377			*/
378			void
379			set_attnpos(off_t pos)
380			{
381			int c;
382
383			if (pos != -1) {
384			if (ch_seek(pos))
385			return;
386			for (;;) {
387			c = ch_forw_get();
388			if (c == EOI)
389			return;
390			if (c != '\n' && c != '\r')
391			break;
392			pos++;
393			}
394			}
395			start_attnpos = pos;
396			for (;;) {
397			c = ch_forw_get();
398			pos++;
399			if (c == EOI \|\| c == '\n' \|\| c == '\r')
400			break;
401			}
402			end_attnpos = pos;
403			}