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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/less/less/../lsystem.c	Lines:	0	89	0.0 %
Date:	2017-11-13	Branches:	0	48	0.0 %


/*
 * 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 to execute other programs.
 * Necessarily very OS dependent.
 */

#include <signal.h>

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

extern int screen_trashed;
extern IFILE curr_ifile;

static int pipe_data(char *cmd, off_t spos, off_t epos);

/*
 * Pass the specified command to a shell to be executed.
 * Like plain "system()", but handles resetting terminal modes, etc.
 */
void
lsystem(const char *cmd, const char *donemsg)
{
	int inp;
	char *shell;
	char *p;
	IFILE save_ifile;

	/*
	 * Print the command which is to be executed,
	 * unless the command starts with a "-".
	 */
	if (cmd[0] == '-')
		cmd++;
	else {
		clear_bot();
		putstr("!");
		putstr(cmd);
		putstr("\n");
	}

	/*
	 * Close the current input file.
	 */
	save_ifile = save_curr_ifile();
	(void) edit_ifile(NULL);

	/*
	 * De-initialize the terminal and take out of raw mode.
	 */
	deinit();
	flush(0);	/* Make sure the deinit chars get out */
	raw_mode(0);

	/*
	 * Restore signals to their defaults.
	 */
	init_signals(0);

	/*
	 * Force standard input to be the user's terminal
	 * (the normal standard input), even if less's standard input
	 * is coming from a pipe.
	 */
	inp = dup(0);
	(void) close(0);
	if (open("/dev/tty", O_RDONLY) < 0)
		(void) dup(inp);

	/*
	 * Pass the command to the system to be executed.
	 * If we have a SHELL environment variable, use
	 * <$SHELL -c "command"> instead of just <command>.
	 * If the command is empty, just invoke a shell.
	 */
	p = NULL;
	if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0') {
		if (*cmd == '\0') {
			p = estrdup(shell);
		} else {
			char *esccmd = shell_quote(cmd);
			if (esccmd != NULL) {
				p = easprintf("%s -c %s", shell, esccmd);
				free(esccmd);
			}
		}
	}
	if (p == NULL) {
		if (*cmd == '\0')
			p = estrdup("sh");
		else
			p = estrdup(cmd);
	}
	(void) system(p);
	free(p);

	/*
	 * Restore standard input, reset signals, raw mode, etc.
	 */
	(void) close(0);
	(void) dup(inp);
	(void) close(inp);

	init_signals(1);
	raw_mode(1);
	if (donemsg != NULL) {
		putstr(donemsg);
		putstr("  (press RETURN)");
		get_return();
		(void) putchr('\n');
		flush(0);
	}
	init();
	screen_trashed = 1;

	/*
	 * Reopen the current input file.
	 */
	reedit_ifile(save_ifile);

	/*
	 * Since we were ignoring window change signals while we executed
	 * the system command, we must assume the window changed.
	 * Warning: this leaves a signal pending (in "sigs"),
	 * so psignals() should be called soon after lsystem().
	 */
	sigwinch(0);
}

/*
 * Pipe a section of the input file into the given shell command.
 * The section to be piped is the section "between" the current
 * position and the position marked by the given letter.
 *
 * If the mark is after the current screen, the section between
 * the top line displayed and the mark is piped.
 * If the mark is before the current screen, the section between
 * the mark and the bottom line displayed is piped.
 * If the mark is on the current screen, or if the mark is ".",
 * the whole current screen is piped.
 */
int
pipe_mark(int c, char *cmd)
{
	off_t mpos, tpos, bpos;

	/*
	 * mpos = the marked position.
	 * tpos = top of screen.
	 * bpos = bottom of screen.
	 */
	mpos = markpos(c);
	if (mpos == -1)
		return (-1);
	tpos = position(TOP);
	if (tpos == -1)
		tpos = ch_zero();
	bpos = position(BOTTOM);

	if (c == '.')
		return (pipe_data(cmd, tpos, bpos));
	else if (mpos <= tpos)
		return (pipe_data(cmd, mpos, bpos));
	else if (bpos == -1)
		return (pipe_data(cmd, tpos, bpos));
	else
		return (pipe_data(cmd, tpos, mpos));
}

/*
 * Create a pipe to the given shell command.
 * Feed it the file contents between the positions spos and epos.
 */
static int
pipe_data(char *cmd, off_t spos, off_t epos)
{
	FILE *f;
	int c;

	/*
	 * This is structured much like lsystem().
	 * Since we're running a shell program, we must be careful
	 * to perform the necessary deinitialization before running
	 * the command, and reinitialization after it.
	 */
	if (ch_seek(spos) != 0) {
		error("Cannot seek to start position", NULL);
		return (-1);
	}

	if ((f = popen(cmd, "w")) == NULL) {
		error("Cannot create pipe", NULL);
		return (-1);
	}
	clear_bot();
	putstr("!");
	putstr(cmd);
	putstr("\n");

	deinit();
	flush(0);
	raw_mode(0);
	init_signals(0);
	lsignal(SIGPIPE, SIG_IGN);

	c = EOI;
	while (epos == -1 || spos++ <= epos) {
		/*
		 * Read a character from the file and give it to the pipe.
		 */
		c = ch_forw_get();
		if (c == EOI)
			break;
		if (putc(c, f) == EOF)
			break;
	}

	/*
	 * Finish up the last line.
	 */
	while (c != '\n' && c != EOI) {
		c = ch_forw_get();
		if (c == EOI)
			break;
		if (putc(c, f) == EOF)
			break;
	}

	(void) pclose(f);

	lsignal(SIGPIPE, SIG_DFL);
	init_signals(1);
	raw_mode(1);
	init();
	screen_trashed = 1;
	/* {{ Probably don't need this here. }} */
	sigwinch(0);
	return (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 to execute other programs.
14			* Necessarily very OS dependent.
15			*/
16
17			#include <signal.h>
18
19			#include "less.h"
20			#include "position.h"
21
22			extern int screen_trashed;
23			extern IFILE curr_ifile;
24
25			static int pipe_data(char *cmd, off_t spos, off_t epos);
26
27			/*
28			* Pass the specified command to a shell to be executed.
29			* Like plain "system()", but handles resetting terminal modes, etc.
30			*/
31			void
32			lsystem(const char cmd, const char donemsg)
33			{
34			int inp;
35			char *shell;
36			char *p;
37			IFILE save_ifile;
38
39			/*
40			* Print the command which is to be executed,
41			* unless the command starts with a "-".
42			*/
43			if (cmd[0] == '-')
44			cmd++;
45			else {
46			clear_bot();
47			putstr("!");
48			putstr(cmd);
49			putstr("\n");
50			}
51
52			/*
53			* Close the current input file.
54			*/
55			save_ifile = save_curr_ifile();
56			(void) edit_ifile(NULL);
57
58			/*
59			* De-initialize the terminal and take out of raw mode.
60			*/
61			deinit();
62			flush(0); /* Make sure the deinit chars get out */
63			raw_mode(0);
64
65			/*
66			* Restore signals to their defaults.
67			*/
68			init_signals(0);
69
70			/*
71			* Force standard input to be the user's terminal
72			* (the normal standard input), even if less's standard input
73			* is coming from a pipe.
74			*/
75			inp = dup(0);
76			(void) close(0);
77			if (open("/dev/tty", O_RDONLY) < 0)
78			(void) dup(inp);
79
80			/*
81			* Pass the command to the system to be executed.
82			* If we have a SHELL environment variable, use
83			* <$SHELL -c "command"> instead of just <command>.
84			* If the command is empty, just invoke a shell.
85			*/
86			p = NULL;
87			if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0') {
88			if (*cmd == '\0') {
89			p = estrdup(shell);
90			} else {
91			char *esccmd = shell_quote(cmd);
92			if (esccmd != NULL) {
93			p = easprintf("%s -c %s", shell, esccmd);
94			free(esccmd);
95			}
96			}
97			}
98			if (p == NULL) {
99			if (*cmd == '\0')
100			p = estrdup("sh");
101			else
102			p = estrdup(cmd);
103			}
104			(void) system(p);
105			free(p);
106
107			/*
108			* Restore standard input, reset signals, raw mode, etc.
109			*/
110			(void) close(0);
111			(void) dup(inp);
112			(void) close(inp);
113
114			init_signals(1);
115			raw_mode(1);
116			if (donemsg != NULL) {
117			putstr(donemsg);
118			putstr(" (press RETURN)");
119			get_return();
120			(void) putchr('\n');
121			flush(0);
122			}
123			init();
124			screen_trashed = 1;
125
126			/*
127			* Reopen the current input file.
128			*/
129			reedit_ifile(save_ifile);
130
131			/*
132			* Since we were ignoring window change signals while we executed
133			* the system command, we must assume the window changed.
134			* Warning: this leaves a signal pending (in "sigs"),
135			* so psignals() should be called soon after lsystem().
136			*/
137			sigwinch(0);
138			}
139
140			/*
141			* Pipe a section of the input file into the given shell command.
142			* The section to be piped is the section "between" the current
143			* position and the position marked by the given letter.
144			*
145			* If the mark is after the current screen, the section between
146			* the top line displayed and the mark is piped.
147			* If the mark is before the current screen, the section between
148			* the mark and the bottom line displayed is piped.
149			* If the mark is on the current screen, or if the mark is ".",
150			* the whole current screen is piped.
151			*/
152			int
153			pipe_mark(int c, char *cmd)
154			{
155			off_t mpos, tpos, bpos;
156
157			/*
158			* mpos = the marked position.
159			* tpos = top of screen.
160			* bpos = bottom of screen.
161			*/
162			mpos = markpos(c);
163			if (mpos == -1)
164			return (-1);
165			tpos = position(TOP);
166			if (tpos == -1)
167			tpos = ch_zero();
168			bpos = position(BOTTOM);
169
170			if (c == '.')
171			return (pipe_data(cmd, tpos, bpos));
172			else if (mpos <= tpos)
173			return (pipe_data(cmd, mpos, bpos));
174			else if (bpos == -1)
175			return (pipe_data(cmd, tpos, bpos));
176			else
177			return (pipe_data(cmd, tpos, mpos));
178			}
179
180			/*
181			* Create a pipe to the given shell command.
182			* Feed it the file contents between the positions spos and epos.
183			*/
184			static int
185			pipe_data(char *cmd, off_t spos, off_t epos)
186			{
187			FILE *f;
188			int c;
189
190			/*
191			* This is structured much like lsystem().
192			* Since we're running a shell program, we must be careful
193			* to perform the necessary deinitialization before running
194			* the command, and reinitialization after it.
195			*/
196			if (ch_seek(spos) != 0) {
197			error("Cannot seek to start position", NULL);
198			return (-1);
199			}
200
201			if ((f = popen(cmd, "w")) == NULL) {
202			error("Cannot create pipe", NULL);
203			return (-1);
204			}
205			clear_bot();
206			putstr("!");
207			putstr(cmd);
208			putstr("\n");
209
210			deinit();
211			flush(0);
212			raw_mode(0);
213			init_signals(0);
214			lsignal(SIGPIPE, SIG_IGN);
215
216			c = EOI;
217			while (epos == -1 \|\| spos++ <= epos) {
218			/*
219			* Read a character from the file and give it to the pipe.
220			*/
221			c = ch_forw_get();
222			if (c == EOI)
223			break;
224			if (putc(c, f) == EOF)
225			break;
226			}
227
228			/*
229			* Finish up the last line.
230			*/
231			while (c != '\n' && c != EOI) {
232			c = ch_forw_get();
233			if (c == EOI)
234			break;
235			if (putc(c, f) == EOF)
236			break;
237			}
238
239			(void) pclose(f);
240
241			lsignal(SIGPIPE, SIG_DFL);
242			init_signals(1);
243			raw_mode(1);
244			init();
245			screen_trashed = 1;
246			/* {{ Probably don't need this here. }} */
247			sigwinch(0);
248			return (0);
249			}