xref: /freebsd/contrib/less/lsystem.c (revision 7374caaaed222af059fc66cb7fade7074ab391f4)
1a5f0fb15SPaul Saab /*
27374caaaSXin LI  * Copyright (C) 1984-2008  Mark Nudelman
3a5f0fb15SPaul Saab  *
4a5f0fb15SPaul Saab  * You may distribute under the terms of either the GNU General Public
5a5f0fb15SPaul Saab  * License or the Less License, as specified in the README file.
6a5f0fb15SPaul Saab  *
7a5f0fb15SPaul Saab  * For more information about less, or for information on how to
8a5f0fb15SPaul Saab  * contact the author, see the README file.
9a5f0fb15SPaul Saab  */
10a5f0fb15SPaul Saab 
11a5f0fb15SPaul Saab 
12a5f0fb15SPaul Saab /*
13a5f0fb15SPaul Saab  * Routines to execute other programs.
14a5f0fb15SPaul Saab  * Necessarily very OS dependent.
15a5f0fb15SPaul Saab  */
16a5f0fb15SPaul Saab 
17a5f0fb15SPaul Saab #include "less.h"
18c9346414SPaul Saab #include <signal.h>
19a5f0fb15SPaul Saab #include "position.h"
20a5f0fb15SPaul Saab 
21a5f0fb15SPaul Saab #if MSDOS_COMPILER
22a5f0fb15SPaul Saab #include <dos.h>
23a5f0fb15SPaul Saab #ifdef _MSC_VER
24a5f0fb15SPaul Saab #include <direct.h>
25a5f0fb15SPaul Saab #define setdisk(n) _chdrive((n)+1)
26a5f0fb15SPaul Saab #else
27a5f0fb15SPaul Saab #include <dir.h>
28a5f0fb15SPaul Saab #endif
29a5f0fb15SPaul Saab #endif
30a5f0fb15SPaul Saab 
31a5f0fb15SPaul Saab extern int screen_trashed;
32a5f0fb15SPaul Saab extern IFILE curr_ifile;
33a5f0fb15SPaul Saab 
34a5f0fb15SPaul Saab 
35a5f0fb15SPaul Saab #if HAVE_SYSTEM
36a5f0fb15SPaul Saab 
37a5f0fb15SPaul Saab /*
38a5f0fb15SPaul Saab  * Pass the specified command to a shell to be executed.
39a5f0fb15SPaul Saab  * Like plain "system()", but handles resetting terminal modes, etc.
40a5f0fb15SPaul Saab  */
41a5f0fb15SPaul Saab 	public void
42a5f0fb15SPaul Saab lsystem(cmd, donemsg)
43a5f0fb15SPaul Saab 	char *cmd;
44a5f0fb15SPaul Saab 	char *donemsg;
45a5f0fb15SPaul Saab {
46a5f0fb15SPaul Saab 	register int inp;
47a5f0fb15SPaul Saab #if HAVE_SHELL
48a5f0fb15SPaul Saab 	register char *shell;
49a5f0fb15SPaul Saab 	register char *p;
50a5f0fb15SPaul Saab #endif
51a5f0fb15SPaul Saab 	IFILE save_ifile;
527374caaaSXin LI #if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C
53a5f0fb15SPaul Saab 	char cwd[FILENAME_MAX+1];
54a5f0fb15SPaul Saab #endif
55a5f0fb15SPaul Saab 
56a5f0fb15SPaul Saab 	/*
57a5f0fb15SPaul Saab 	 * Print the command which is to be executed,
58a5f0fb15SPaul Saab 	 * unless the command starts with a "-".
59a5f0fb15SPaul Saab 	 */
60a5f0fb15SPaul Saab 	if (cmd[0] == '-')
61a5f0fb15SPaul Saab 		cmd++;
62a5f0fb15SPaul Saab 	else
63a5f0fb15SPaul Saab 	{
64a5f0fb15SPaul Saab 		clear_bot();
65a5f0fb15SPaul Saab 		putstr("!");
66a5f0fb15SPaul Saab 		putstr(cmd);
67a5f0fb15SPaul Saab 		putstr("\n");
68a5f0fb15SPaul Saab 	}
69a5f0fb15SPaul Saab 
70a5f0fb15SPaul Saab #if MSDOS_COMPILER
717374caaaSXin LI #if MSDOS_COMPILER==WIN32C
727374caaaSXin LI 	if (*cmd == '\0')
737374caaaSXin LI 		cmd = getenv("COMSPEC");
747374caaaSXin LI #else
75a5f0fb15SPaul Saab 	/*
76a5f0fb15SPaul Saab 	 * Working directory is global on MSDOS.
77a5f0fb15SPaul Saab 	 * The child might change the working directory, so we
78a5f0fb15SPaul Saab 	 * must save and restore CWD across calls to "system",
79a5f0fb15SPaul Saab 	 * or else we won't find our file when we return and
80a5f0fb15SPaul Saab 	 * try to "reedit_ifile" it.
81a5f0fb15SPaul Saab 	 */
82a5f0fb15SPaul Saab 	getcwd(cwd, FILENAME_MAX);
83a5f0fb15SPaul Saab #endif
847374caaaSXin LI #endif
85a5f0fb15SPaul Saab 
86a5f0fb15SPaul Saab 	/*
87a5f0fb15SPaul Saab 	 * Close the current input file.
88a5f0fb15SPaul Saab 	 */
89a5f0fb15SPaul Saab 	save_ifile = save_curr_ifile();
90a5f0fb15SPaul Saab 	(void) edit_ifile(NULL_IFILE);
91a5f0fb15SPaul Saab 
92a5f0fb15SPaul Saab 	/*
93a5f0fb15SPaul Saab 	 * De-initialize the terminal and take out of raw mode.
94a5f0fb15SPaul Saab 	 */
95a5f0fb15SPaul Saab 	deinit();
96a5f0fb15SPaul Saab 	flush();	/* Make sure the deinit chars get out */
97a5f0fb15SPaul Saab 	raw_mode(0);
98a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
99a5f0fb15SPaul Saab 	close_getchr();
100a5f0fb15SPaul Saab #endif
101a5f0fb15SPaul Saab 
102a5f0fb15SPaul Saab 	/*
103a5f0fb15SPaul Saab 	 * Restore signals to their defaults.
104a5f0fb15SPaul Saab 	 */
105a5f0fb15SPaul Saab 	init_signals(0);
106a5f0fb15SPaul Saab 
107a5f0fb15SPaul Saab #if HAVE_DUP
108a5f0fb15SPaul Saab 	/*
109a5f0fb15SPaul Saab 	 * Force standard input to be the user's terminal
110a5f0fb15SPaul Saab 	 * (the normal standard input), even if less's standard input
111a5f0fb15SPaul Saab 	 * is coming from a pipe.
112a5f0fb15SPaul Saab 	 */
113a5f0fb15SPaul Saab 	inp = dup(0);
114a5f0fb15SPaul Saab 	close(0);
115c9346414SPaul Saab #if OS2
116c9346414SPaul Saab 	/* The __open() system call translates "/dev/tty" to "con". */
117c9346414SPaul Saab 	if (__open("/dev/tty", OPEN_READ) < 0)
118c9346414SPaul Saab #else
119a5f0fb15SPaul Saab 	if (open("/dev/tty", OPEN_READ) < 0)
120c9346414SPaul Saab #endif
121a5f0fb15SPaul Saab 		dup(inp);
122a5f0fb15SPaul Saab #endif
123a5f0fb15SPaul Saab 
124a5f0fb15SPaul Saab 	/*
125a5f0fb15SPaul Saab 	 * Pass the command to the system to be executed.
126a5f0fb15SPaul Saab 	 * If we have a SHELL environment variable, use
127a5f0fb15SPaul Saab 	 * <$SHELL -c "command"> instead of just <command>.
128a5f0fb15SPaul Saab 	 * If the command is empty, just invoke a shell.
129a5f0fb15SPaul Saab 	 */
130a5f0fb15SPaul Saab #if HAVE_SHELL
131a5f0fb15SPaul Saab 	p = NULL;
132a5f0fb15SPaul Saab 	if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0')
133a5f0fb15SPaul Saab 	{
134a5f0fb15SPaul Saab 		if (*cmd == '\0')
135a5f0fb15SPaul Saab 			p = save(shell);
136a5f0fb15SPaul Saab 		else
137a5f0fb15SPaul Saab 		{
138000ba3e8STim J. Robbins 			char *esccmd = shell_quote(cmd);
139000ba3e8STim J. Robbins 			if (esccmd != NULL)
140a5f0fb15SPaul Saab 			{
1416dcb072bSXin LI 				int len = strlen(shell) + strlen(esccmd) + 5;
1426dcb072bSXin LI 				p = (char *) ecalloc(len, sizeof(char));
1436dcb072bSXin LI 				SNPRINTF3(p, len, "%s %s %s", shell, shell_coption(), esccmd);
144a5f0fb15SPaul Saab 				free(esccmd);
145a5f0fb15SPaul Saab 			}
146a5f0fb15SPaul Saab 		}
147a5f0fb15SPaul Saab 	}
148a5f0fb15SPaul Saab 	if (p == NULL)
149a5f0fb15SPaul Saab 	{
150a5f0fb15SPaul Saab 		if (*cmd == '\0')
151a5f0fb15SPaul Saab 			p = save("sh");
152a5f0fb15SPaul Saab 		else
153a5f0fb15SPaul Saab 			p = save(cmd);
154a5f0fb15SPaul Saab 	}
155a5f0fb15SPaul Saab 	system(p);
156a5f0fb15SPaul Saab 	free(p);
157a5f0fb15SPaul Saab #else
158a5f0fb15SPaul Saab #if MSDOS_COMPILER==DJGPPC
159a5f0fb15SPaul Saab 	/*
160a5f0fb15SPaul Saab 	 * Make stdin of the child be in cooked mode.
161a5f0fb15SPaul Saab 	 */
162a5f0fb15SPaul Saab 	setmode(0, O_TEXT);
163a5f0fb15SPaul Saab 	/*
164a5f0fb15SPaul Saab 	 * We don't need to catch signals of the child (it
165a5f0fb15SPaul Saab 	 * also makes trouble with some DPMI servers).
166a5f0fb15SPaul Saab 	 */
167a5f0fb15SPaul Saab 	__djgpp_exception_toggle();
168a5f0fb15SPaul Saab   	system(cmd);
169a5f0fb15SPaul Saab 	__djgpp_exception_toggle();
170a5f0fb15SPaul Saab #else
171a5f0fb15SPaul Saab 	system(cmd);
172a5f0fb15SPaul Saab #endif
173a5f0fb15SPaul Saab #endif
174a5f0fb15SPaul Saab 
175a5f0fb15SPaul Saab #if HAVE_DUP
176a5f0fb15SPaul Saab 	/*
177a5f0fb15SPaul Saab 	 * Restore standard input, reset signals, raw mode, etc.
178a5f0fb15SPaul Saab 	 */
179a5f0fb15SPaul Saab 	close(0);
180a5f0fb15SPaul Saab 	dup(inp);
181a5f0fb15SPaul Saab 	close(inp);
182a5f0fb15SPaul Saab #endif
183a5f0fb15SPaul Saab 
184a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
185a5f0fb15SPaul Saab 	open_getchr();
186a5f0fb15SPaul Saab #endif
187a5f0fb15SPaul Saab 	init_signals(1);
188a5f0fb15SPaul Saab 	raw_mode(1);
189a5f0fb15SPaul Saab 	if (donemsg != NULL)
190a5f0fb15SPaul Saab 	{
191a5f0fb15SPaul Saab 		putstr(donemsg);
192a5f0fb15SPaul Saab 		putstr("  (press RETURN)");
193a5f0fb15SPaul Saab 		get_return();
194a5f0fb15SPaul Saab 		putchr('\n');
195a5f0fb15SPaul Saab 		flush();
196a5f0fb15SPaul Saab 	}
197a5f0fb15SPaul Saab 	init();
198a5f0fb15SPaul Saab 	screen_trashed = 1;
199a5f0fb15SPaul Saab 
2007374caaaSXin LI #if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C
201a5f0fb15SPaul Saab 	/*
202a5f0fb15SPaul Saab 	 * Restore the previous directory (possibly
203a5f0fb15SPaul Saab 	 * changed by the child program we just ran).
204a5f0fb15SPaul Saab 	 */
205a5f0fb15SPaul Saab 	chdir(cwd);
206a5f0fb15SPaul Saab #if MSDOS_COMPILER != DJGPPC
207a5f0fb15SPaul Saab 	/*
208a5f0fb15SPaul Saab 	 * Some versions of chdir() don't change to the drive
209a5f0fb15SPaul Saab 	 * which is part of CWD.  (DJGPP does this in chdir.)
210a5f0fb15SPaul Saab 	 */
211a5f0fb15SPaul Saab 	if (cwd[1] == ':')
212a5f0fb15SPaul Saab 	{
213a5f0fb15SPaul Saab 		if (cwd[0] >= 'a' && cwd[0] <= 'z')
214a5f0fb15SPaul Saab 			setdisk(cwd[0] - 'a');
215a5f0fb15SPaul Saab 		else if (cwd[0] >= 'A' && cwd[0] <= 'Z')
216a5f0fb15SPaul Saab 			setdisk(cwd[0] - 'A');
217a5f0fb15SPaul Saab 	}
218a5f0fb15SPaul Saab #endif
219a5f0fb15SPaul Saab #endif
220a5f0fb15SPaul Saab 
221a5f0fb15SPaul Saab 	/*
222a5f0fb15SPaul Saab 	 * Reopen the current input file.
223a5f0fb15SPaul Saab 	 */
224a5f0fb15SPaul Saab 	reedit_ifile(save_ifile);
225a5f0fb15SPaul Saab 
226a5f0fb15SPaul Saab #if defined(SIGWINCH) || defined(SIGWIND)
227a5f0fb15SPaul Saab 	/*
228a5f0fb15SPaul Saab 	 * Since we were ignoring window change signals while we executed
229a5f0fb15SPaul Saab 	 * the system command, we must assume the window changed.
230a5f0fb15SPaul Saab 	 * Warning: this leaves a signal pending (in "sigs"),
231a5f0fb15SPaul Saab 	 * so psignals() should be called soon after lsystem().
232a5f0fb15SPaul Saab 	 */
233a5f0fb15SPaul Saab 	winch(0);
234a5f0fb15SPaul Saab #endif
235a5f0fb15SPaul Saab }
236a5f0fb15SPaul Saab 
237a5f0fb15SPaul Saab #endif
238a5f0fb15SPaul Saab 
239a5f0fb15SPaul Saab #if PIPEC
240a5f0fb15SPaul Saab 
241a5f0fb15SPaul Saab /*
242a5f0fb15SPaul Saab  * Pipe a section of the input file into the given shell command.
243a5f0fb15SPaul Saab  * The section to be piped is the section "between" the current
244a5f0fb15SPaul Saab  * position and the position marked by the given letter.
245a5f0fb15SPaul Saab  *
246a5f0fb15SPaul Saab  * If the mark is after the current screen, the section between
247a5f0fb15SPaul Saab  * the top line displayed and the mark is piped.
248a5f0fb15SPaul Saab  * If the mark is before the current screen, the section between
249a5f0fb15SPaul Saab  * the mark and the bottom line displayed is piped.
250a5f0fb15SPaul Saab  * If the mark is on the current screen, or if the mark is ".",
251a5f0fb15SPaul Saab  * the whole current screen is piped.
252a5f0fb15SPaul Saab  */
253a5f0fb15SPaul Saab 	public int
254a5f0fb15SPaul Saab pipe_mark(c, cmd)
255a5f0fb15SPaul Saab 	int c;
256a5f0fb15SPaul Saab 	char *cmd;
257a5f0fb15SPaul Saab {
258a5f0fb15SPaul Saab 	POSITION mpos, tpos, bpos;
259a5f0fb15SPaul Saab 
260a5f0fb15SPaul Saab 	/*
261a5f0fb15SPaul Saab 	 * mpos = the marked position.
262a5f0fb15SPaul Saab 	 * tpos = top of screen.
263a5f0fb15SPaul Saab 	 * bpos = bottom of screen.
264a5f0fb15SPaul Saab 	 */
265a5f0fb15SPaul Saab 	mpos = markpos(c);
266a5f0fb15SPaul Saab 	if (mpos == NULL_POSITION)
267a5f0fb15SPaul Saab 		return (-1);
268a5f0fb15SPaul Saab 	tpos = position(TOP);
269a5f0fb15SPaul Saab 	if (tpos == NULL_POSITION)
270a5f0fb15SPaul Saab 		tpos = ch_zero();
271a5f0fb15SPaul Saab 	bpos = position(BOTTOM);
272a5f0fb15SPaul Saab 
273a5f0fb15SPaul Saab  	if (c == '.')
274a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, bpos));
275a5f0fb15SPaul Saab  	else if (mpos <= tpos)
276a5f0fb15SPaul Saab  		return (pipe_data(cmd, mpos, bpos));
277a5f0fb15SPaul Saab  	else if (bpos == NULL_POSITION)
278a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, bpos));
279a5f0fb15SPaul Saab  	else
280a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, mpos));
281a5f0fb15SPaul Saab }
282a5f0fb15SPaul Saab 
283a5f0fb15SPaul Saab /*
284a5f0fb15SPaul Saab  * Create a pipe to the given shell command.
285a5f0fb15SPaul Saab  * Feed it the file contents between the positions spos and epos.
286a5f0fb15SPaul Saab  */
287a5f0fb15SPaul Saab 	public int
288a5f0fb15SPaul Saab pipe_data(cmd, spos, epos)
289a5f0fb15SPaul Saab 	char *cmd;
290a5f0fb15SPaul Saab 	POSITION spos;
291a5f0fb15SPaul Saab 	POSITION epos;
292a5f0fb15SPaul Saab {
293a5f0fb15SPaul Saab 	register FILE *f;
294a5f0fb15SPaul Saab 	register int c;
295a5f0fb15SPaul Saab 	extern FILE *popen();
296a5f0fb15SPaul Saab 
297a5f0fb15SPaul Saab 	/*
298a5f0fb15SPaul Saab 	 * This is structured much like lsystem().
299a5f0fb15SPaul Saab 	 * Since we're running a shell program, we must be careful
300a5f0fb15SPaul Saab 	 * to perform the necessary deinitialization before running
301a5f0fb15SPaul Saab 	 * the command, and reinitialization after it.
302a5f0fb15SPaul Saab 	 */
303a5f0fb15SPaul Saab 	if (ch_seek(spos) != 0)
304a5f0fb15SPaul Saab 	{
305a5f0fb15SPaul Saab 		error("Cannot seek to start position", NULL_PARG);
306a5f0fb15SPaul Saab 		return (-1);
307a5f0fb15SPaul Saab 	}
308a5f0fb15SPaul Saab 
309a5f0fb15SPaul Saab 	if ((f = popen(cmd, "w")) == NULL)
310a5f0fb15SPaul Saab 	{
311a5f0fb15SPaul Saab 		error("Cannot create pipe", NULL_PARG);
312a5f0fb15SPaul Saab 		return (-1);
313a5f0fb15SPaul Saab 	}
314a5f0fb15SPaul Saab 	clear_bot();
315a5f0fb15SPaul Saab 	putstr("!");
316a5f0fb15SPaul Saab 	putstr(cmd);
317a5f0fb15SPaul Saab 	putstr("\n");
318a5f0fb15SPaul Saab 
319a5f0fb15SPaul Saab 	deinit();
320a5f0fb15SPaul Saab 	flush();
321a5f0fb15SPaul Saab 	raw_mode(0);
322a5f0fb15SPaul Saab 	init_signals(0);
323a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
324a5f0fb15SPaul Saab 	close_getchr();
325a5f0fb15SPaul Saab #endif
326a5f0fb15SPaul Saab #ifdef SIGPIPE
327a5f0fb15SPaul Saab 	LSIGNAL(SIGPIPE, SIG_IGN);
328a5f0fb15SPaul Saab #endif
329a5f0fb15SPaul Saab 
330a5f0fb15SPaul Saab 	c = EOI;
331a5f0fb15SPaul Saab 	while (epos == NULL_POSITION || spos++ <= epos)
332a5f0fb15SPaul Saab 	{
333a5f0fb15SPaul Saab 		/*
334a5f0fb15SPaul Saab 		 * Read a character from the file and give it to the pipe.
335a5f0fb15SPaul Saab 		 */
336a5f0fb15SPaul Saab 		c = ch_forw_get();
337a5f0fb15SPaul Saab 		if (c == EOI)
338a5f0fb15SPaul Saab 			break;
339a5f0fb15SPaul Saab 		if (putc(c, f) == EOF)
340a5f0fb15SPaul Saab 			break;
341a5f0fb15SPaul Saab 	}
342a5f0fb15SPaul Saab 
343a5f0fb15SPaul Saab 	/*
344a5f0fb15SPaul Saab 	 * Finish up the last line.
345a5f0fb15SPaul Saab 	 */
346a5f0fb15SPaul Saab  	while (c != '\n' && c != EOI )
347a5f0fb15SPaul Saab  	{
348a5f0fb15SPaul Saab  		c = ch_forw_get();
349a5f0fb15SPaul Saab  		if (c == EOI)
350a5f0fb15SPaul Saab  			break;
351a5f0fb15SPaul Saab  		if (putc(c, f) == EOF)
352a5f0fb15SPaul Saab  			break;
353a5f0fb15SPaul Saab  	}
354a5f0fb15SPaul Saab 
355a5f0fb15SPaul Saab 	pclose(f);
356a5f0fb15SPaul Saab 
357a5f0fb15SPaul Saab #ifdef SIGPIPE
358a5f0fb15SPaul Saab 	LSIGNAL(SIGPIPE, SIG_DFL);
359a5f0fb15SPaul Saab #endif
360a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
361a5f0fb15SPaul Saab 	open_getchr();
362a5f0fb15SPaul Saab #endif
363a5f0fb15SPaul Saab 	init_signals(1);
364a5f0fb15SPaul Saab 	raw_mode(1);
365a5f0fb15SPaul Saab 	init();
366a5f0fb15SPaul Saab 	screen_trashed = 1;
367a5f0fb15SPaul Saab #if defined(SIGWINCH) || defined(SIGWIND)
368a5f0fb15SPaul Saab 	/* {{ Probably don't need this here. }} */
369a5f0fb15SPaul Saab 	winch(0);
370a5f0fb15SPaul Saab #endif
371a5f0fb15SPaul Saab 	return (0);
372a5f0fb15SPaul Saab }
373a5f0fb15SPaul Saab 
374a5f0fb15SPaul Saab #endif
375