xref: /freebsd/contrib/less/lsystem.c (revision 6dcb072b3021f88118ab758d851d01be270f36b2)
1a5f0fb15SPaul Saab /*
26dcb072bSXin LI  * Copyright (C) 1984-2005  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;
52a5f0fb15SPaul Saab #if MSDOS_COMPILER
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
71a5f0fb15SPaul Saab 	/*
72a5f0fb15SPaul Saab 	 * Working directory is global on MSDOS.
73a5f0fb15SPaul Saab 	 * The child might change the working directory, so we
74a5f0fb15SPaul Saab 	 * must save and restore CWD across calls to "system",
75a5f0fb15SPaul Saab 	 * or else we won't find our file when we return and
76a5f0fb15SPaul Saab 	 * try to "reedit_ifile" it.
77a5f0fb15SPaul Saab 	 */
78a5f0fb15SPaul Saab 	getcwd(cwd, FILENAME_MAX);
79a5f0fb15SPaul Saab #endif
80a5f0fb15SPaul Saab 
81a5f0fb15SPaul Saab 	/*
82a5f0fb15SPaul Saab 	 * Close the current input file.
83a5f0fb15SPaul Saab 	 */
84a5f0fb15SPaul Saab 	save_ifile = save_curr_ifile();
85a5f0fb15SPaul Saab 	(void) edit_ifile(NULL_IFILE);
86a5f0fb15SPaul Saab 
87a5f0fb15SPaul Saab 	/*
88a5f0fb15SPaul Saab 	 * De-initialize the terminal and take out of raw mode.
89a5f0fb15SPaul Saab 	 */
90a5f0fb15SPaul Saab 	deinit();
91a5f0fb15SPaul Saab 	flush();	/* Make sure the deinit chars get out */
92a5f0fb15SPaul Saab 	raw_mode(0);
93a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
94a5f0fb15SPaul Saab 	close_getchr();
95a5f0fb15SPaul Saab #endif
96a5f0fb15SPaul Saab 
97a5f0fb15SPaul Saab 	/*
98a5f0fb15SPaul Saab 	 * Restore signals to their defaults.
99a5f0fb15SPaul Saab 	 */
100a5f0fb15SPaul Saab 	init_signals(0);
101a5f0fb15SPaul Saab 
102a5f0fb15SPaul Saab #if HAVE_DUP
103a5f0fb15SPaul Saab 	/*
104a5f0fb15SPaul Saab 	 * Force standard input to be the user's terminal
105a5f0fb15SPaul Saab 	 * (the normal standard input), even if less's standard input
106a5f0fb15SPaul Saab 	 * is coming from a pipe.
107a5f0fb15SPaul Saab 	 */
108a5f0fb15SPaul Saab 	inp = dup(0);
109a5f0fb15SPaul Saab 	close(0);
110c9346414SPaul Saab #if OS2
111c9346414SPaul Saab 	/* The __open() system call translates "/dev/tty" to "con". */
112c9346414SPaul Saab 	if (__open("/dev/tty", OPEN_READ) < 0)
113c9346414SPaul Saab #else
114a5f0fb15SPaul Saab 	if (open("/dev/tty", OPEN_READ) < 0)
115c9346414SPaul Saab #endif
116a5f0fb15SPaul Saab 		dup(inp);
117a5f0fb15SPaul Saab #endif
118a5f0fb15SPaul Saab 
119a5f0fb15SPaul Saab 	/*
120a5f0fb15SPaul Saab 	 * Pass the command to the system to be executed.
121a5f0fb15SPaul Saab 	 * If we have a SHELL environment variable, use
122a5f0fb15SPaul Saab 	 * <$SHELL -c "command"> instead of just <command>.
123a5f0fb15SPaul Saab 	 * If the command is empty, just invoke a shell.
124a5f0fb15SPaul Saab 	 */
125a5f0fb15SPaul Saab #if HAVE_SHELL
126a5f0fb15SPaul Saab 	p = NULL;
127a5f0fb15SPaul Saab 	if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0')
128a5f0fb15SPaul Saab 	{
129a5f0fb15SPaul Saab 		if (*cmd == '\0')
130a5f0fb15SPaul Saab 			p = save(shell);
131a5f0fb15SPaul Saab 		else
132a5f0fb15SPaul Saab 		{
133000ba3e8STim J. Robbins 			char *esccmd = shell_quote(cmd);
134000ba3e8STim J. Robbins 			if (esccmd != NULL)
135a5f0fb15SPaul Saab 			{
1366dcb072bSXin LI 				int len = strlen(shell) + strlen(esccmd) + 5;
1376dcb072bSXin LI 				p = (char *) ecalloc(len, sizeof(char));
1386dcb072bSXin LI 				SNPRINTF3(p, len, "%s %s %s", shell, shell_coption(), esccmd);
139a5f0fb15SPaul Saab 				free(esccmd);
140a5f0fb15SPaul Saab 			}
141a5f0fb15SPaul Saab 		}
142a5f0fb15SPaul Saab 	}
143a5f0fb15SPaul Saab 	if (p == NULL)
144a5f0fb15SPaul Saab 	{
145a5f0fb15SPaul Saab 		if (*cmd == '\0')
146a5f0fb15SPaul Saab 			p = save("sh");
147a5f0fb15SPaul Saab 		else
148a5f0fb15SPaul Saab 			p = save(cmd);
149a5f0fb15SPaul Saab 	}
150a5f0fb15SPaul Saab 	system(p);
151a5f0fb15SPaul Saab 	free(p);
152a5f0fb15SPaul Saab #else
153a5f0fb15SPaul Saab #if MSDOS_COMPILER==DJGPPC
154a5f0fb15SPaul Saab 	/*
155a5f0fb15SPaul Saab 	 * Make stdin of the child be in cooked mode.
156a5f0fb15SPaul Saab 	 */
157a5f0fb15SPaul Saab 	setmode(0, O_TEXT);
158a5f0fb15SPaul Saab 	/*
159a5f0fb15SPaul Saab 	 * We don't need to catch signals of the child (it
160a5f0fb15SPaul Saab 	 * also makes trouble with some DPMI servers).
161a5f0fb15SPaul Saab 	 */
162a5f0fb15SPaul Saab 	__djgpp_exception_toggle();
163a5f0fb15SPaul Saab   	system(cmd);
164a5f0fb15SPaul Saab 	__djgpp_exception_toggle();
165a5f0fb15SPaul Saab #else
166a5f0fb15SPaul Saab 	system(cmd);
167a5f0fb15SPaul Saab #endif
168a5f0fb15SPaul Saab #endif
169a5f0fb15SPaul Saab 
170a5f0fb15SPaul Saab #if HAVE_DUP
171a5f0fb15SPaul Saab 	/*
172a5f0fb15SPaul Saab 	 * Restore standard input, reset signals, raw mode, etc.
173a5f0fb15SPaul Saab 	 */
174a5f0fb15SPaul Saab 	close(0);
175a5f0fb15SPaul Saab 	dup(inp);
176a5f0fb15SPaul Saab 	close(inp);
177a5f0fb15SPaul Saab #endif
178a5f0fb15SPaul Saab 
179a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
180a5f0fb15SPaul Saab 	open_getchr();
181a5f0fb15SPaul Saab #endif
182a5f0fb15SPaul Saab 	init_signals(1);
183a5f0fb15SPaul Saab 	raw_mode(1);
184a5f0fb15SPaul Saab 	if (donemsg != NULL)
185a5f0fb15SPaul Saab 	{
186a5f0fb15SPaul Saab 		putstr(donemsg);
187a5f0fb15SPaul Saab 		putstr("  (press RETURN)");
188a5f0fb15SPaul Saab 		get_return();
189a5f0fb15SPaul Saab 		putchr('\n');
190a5f0fb15SPaul Saab 		flush();
191a5f0fb15SPaul Saab 	}
192a5f0fb15SPaul Saab 	init();
193a5f0fb15SPaul Saab 	screen_trashed = 1;
194a5f0fb15SPaul Saab 
195a5f0fb15SPaul Saab #if MSDOS_COMPILER
196a5f0fb15SPaul Saab 	/*
197a5f0fb15SPaul Saab 	 * Restore the previous directory (possibly
198a5f0fb15SPaul Saab 	 * changed by the child program we just ran).
199a5f0fb15SPaul Saab 	 */
200a5f0fb15SPaul Saab 	chdir(cwd);
201a5f0fb15SPaul Saab #if MSDOS_COMPILER != DJGPPC
202a5f0fb15SPaul Saab 	/*
203a5f0fb15SPaul Saab 	 * Some versions of chdir() don't change to the drive
204a5f0fb15SPaul Saab 	 * which is part of CWD.  (DJGPP does this in chdir.)
205a5f0fb15SPaul Saab 	 */
206a5f0fb15SPaul Saab 	if (cwd[1] == ':')
207a5f0fb15SPaul Saab 	{
208a5f0fb15SPaul Saab 		if (cwd[0] >= 'a' && cwd[0] <= 'z')
209a5f0fb15SPaul Saab 			setdisk(cwd[0] - 'a');
210a5f0fb15SPaul Saab 		else if (cwd[0] >= 'A' && cwd[0] <= 'Z')
211a5f0fb15SPaul Saab 			setdisk(cwd[0] - 'A');
212a5f0fb15SPaul Saab 	}
213a5f0fb15SPaul Saab #endif
214a5f0fb15SPaul Saab #endif
215a5f0fb15SPaul Saab 
216a5f0fb15SPaul Saab 	/*
217a5f0fb15SPaul Saab 	 * Reopen the current input file.
218a5f0fb15SPaul Saab 	 */
219a5f0fb15SPaul Saab 	reedit_ifile(save_ifile);
220a5f0fb15SPaul Saab 
221a5f0fb15SPaul Saab #if defined(SIGWINCH) || defined(SIGWIND)
222a5f0fb15SPaul Saab 	/*
223a5f0fb15SPaul Saab 	 * Since we were ignoring window change signals while we executed
224a5f0fb15SPaul Saab 	 * the system command, we must assume the window changed.
225a5f0fb15SPaul Saab 	 * Warning: this leaves a signal pending (in "sigs"),
226a5f0fb15SPaul Saab 	 * so psignals() should be called soon after lsystem().
227a5f0fb15SPaul Saab 	 */
228a5f0fb15SPaul Saab 	winch(0);
229a5f0fb15SPaul Saab #endif
230a5f0fb15SPaul Saab }
231a5f0fb15SPaul Saab 
232a5f0fb15SPaul Saab #endif
233a5f0fb15SPaul Saab 
234a5f0fb15SPaul Saab #if PIPEC
235a5f0fb15SPaul Saab 
236a5f0fb15SPaul Saab /*
237a5f0fb15SPaul Saab  * Pipe a section of the input file into the given shell command.
238a5f0fb15SPaul Saab  * The section to be piped is the section "between" the current
239a5f0fb15SPaul Saab  * position and the position marked by the given letter.
240a5f0fb15SPaul Saab  *
241a5f0fb15SPaul Saab  * If the mark is after the current screen, the section between
242a5f0fb15SPaul Saab  * the top line displayed and the mark is piped.
243a5f0fb15SPaul Saab  * If the mark is before the current screen, the section between
244a5f0fb15SPaul Saab  * the mark and the bottom line displayed is piped.
245a5f0fb15SPaul Saab  * If the mark is on the current screen, or if the mark is ".",
246a5f0fb15SPaul Saab  * the whole current screen is piped.
247a5f0fb15SPaul Saab  */
248a5f0fb15SPaul Saab 	public int
249a5f0fb15SPaul Saab pipe_mark(c, cmd)
250a5f0fb15SPaul Saab 	int c;
251a5f0fb15SPaul Saab 	char *cmd;
252a5f0fb15SPaul Saab {
253a5f0fb15SPaul Saab 	POSITION mpos, tpos, bpos;
254a5f0fb15SPaul Saab 
255a5f0fb15SPaul Saab 	/*
256a5f0fb15SPaul Saab 	 * mpos = the marked position.
257a5f0fb15SPaul Saab 	 * tpos = top of screen.
258a5f0fb15SPaul Saab 	 * bpos = bottom of screen.
259a5f0fb15SPaul Saab 	 */
260a5f0fb15SPaul Saab 	mpos = markpos(c);
261a5f0fb15SPaul Saab 	if (mpos == NULL_POSITION)
262a5f0fb15SPaul Saab 		return (-1);
263a5f0fb15SPaul Saab 	tpos = position(TOP);
264a5f0fb15SPaul Saab 	if (tpos == NULL_POSITION)
265a5f0fb15SPaul Saab 		tpos = ch_zero();
266a5f0fb15SPaul Saab 	bpos = position(BOTTOM);
267a5f0fb15SPaul Saab 
268a5f0fb15SPaul Saab  	if (c == '.')
269a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, bpos));
270a5f0fb15SPaul Saab  	else if (mpos <= tpos)
271a5f0fb15SPaul Saab  		return (pipe_data(cmd, mpos, bpos));
272a5f0fb15SPaul Saab  	else if (bpos == NULL_POSITION)
273a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, bpos));
274a5f0fb15SPaul Saab  	else
275a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, mpos));
276a5f0fb15SPaul Saab }
277a5f0fb15SPaul Saab 
278a5f0fb15SPaul Saab /*
279a5f0fb15SPaul Saab  * Create a pipe to the given shell command.
280a5f0fb15SPaul Saab  * Feed it the file contents between the positions spos and epos.
281a5f0fb15SPaul Saab  */
282a5f0fb15SPaul Saab 	public int
283a5f0fb15SPaul Saab pipe_data(cmd, spos, epos)
284a5f0fb15SPaul Saab 	char *cmd;
285a5f0fb15SPaul Saab 	POSITION spos;
286a5f0fb15SPaul Saab 	POSITION epos;
287a5f0fb15SPaul Saab {
288a5f0fb15SPaul Saab 	register FILE *f;
289a5f0fb15SPaul Saab 	register int c;
290a5f0fb15SPaul Saab 	extern FILE *popen();
291a5f0fb15SPaul Saab 
292a5f0fb15SPaul Saab 	/*
293a5f0fb15SPaul Saab 	 * This is structured much like lsystem().
294a5f0fb15SPaul Saab 	 * Since we're running a shell program, we must be careful
295a5f0fb15SPaul Saab 	 * to perform the necessary deinitialization before running
296a5f0fb15SPaul Saab 	 * the command, and reinitialization after it.
297a5f0fb15SPaul Saab 	 */
298a5f0fb15SPaul Saab 	if (ch_seek(spos) != 0)
299a5f0fb15SPaul Saab 	{
300a5f0fb15SPaul Saab 		error("Cannot seek to start position", NULL_PARG);
301a5f0fb15SPaul Saab 		return (-1);
302a5f0fb15SPaul Saab 	}
303a5f0fb15SPaul Saab 
304a5f0fb15SPaul Saab 	if ((f = popen(cmd, "w")) == NULL)
305a5f0fb15SPaul Saab 	{
306a5f0fb15SPaul Saab 		error("Cannot create pipe", NULL_PARG);
307a5f0fb15SPaul Saab 		return (-1);
308a5f0fb15SPaul Saab 	}
309a5f0fb15SPaul Saab 	clear_bot();
310a5f0fb15SPaul Saab 	putstr("!");
311a5f0fb15SPaul Saab 	putstr(cmd);
312a5f0fb15SPaul Saab 	putstr("\n");
313a5f0fb15SPaul Saab 
314a5f0fb15SPaul Saab 	deinit();
315a5f0fb15SPaul Saab 	flush();
316a5f0fb15SPaul Saab 	raw_mode(0);
317a5f0fb15SPaul Saab 	init_signals(0);
318a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
319a5f0fb15SPaul Saab 	close_getchr();
320a5f0fb15SPaul Saab #endif
321a5f0fb15SPaul Saab #ifdef SIGPIPE
322a5f0fb15SPaul Saab 	LSIGNAL(SIGPIPE, SIG_IGN);
323a5f0fb15SPaul Saab #endif
324a5f0fb15SPaul Saab 
325a5f0fb15SPaul Saab 	c = EOI;
326a5f0fb15SPaul Saab 	while (epos == NULL_POSITION || spos++ <= epos)
327a5f0fb15SPaul Saab 	{
328a5f0fb15SPaul Saab 		/*
329a5f0fb15SPaul Saab 		 * Read a character from the file and give it to the pipe.
330a5f0fb15SPaul Saab 		 */
331a5f0fb15SPaul Saab 		c = ch_forw_get();
332a5f0fb15SPaul Saab 		if (c == EOI)
333a5f0fb15SPaul Saab 			break;
334a5f0fb15SPaul Saab 		if (putc(c, f) == EOF)
335a5f0fb15SPaul Saab 			break;
336a5f0fb15SPaul Saab 	}
337a5f0fb15SPaul Saab 
338a5f0fb15SPaul Saab 	/*
339a5f0fb15SPaul Saab 	 * Finish up the last line.
340a5f0fb15SPaul Saab 	 */
341a5f0fb15SPaul Saab  	while (c != '\n' && c != EOI )
342a5f0fb15SPaul Saab  	{
343a5f0fb15SPaul Saab  		c = ch_forw_get();
344a5f0fb15SPaul Saab  		if (c == EOI)
345a5f0fb15SPaul Saab  			break;
346a5f0fb15SPaul Saab  		if (putc(c, f) == EOF)
347a5f0fb15SPaul Saab  			break;
348a5f0fb15SPaul Saab  	}
349a5f0fb15SPaul Saab 
350a5f0fb15SPaul Saab 	pclose(f);
351a5f0fb15SPaul Saab 
352a5f0fb15SPaul Saab #ifdef SIGPIPE
353a5f0fb15SPaul Saab 	LSIGNAL(SIGPIPE, SIG_DFL);
354a5f0fb15SPaul Saab #endif
355a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
356a5f0fb15SPaul Saab 	open_getchr();
357a5f0fb15SPaul Saab #endif
358a5f0fb15SPaul Saab 	init_signals(1);
359a5f0fb15SPaul Saab 	raw_mode(1);
360a5f0fb15SPaul Saab 	init();
361a5f0fb15SPaul Saab 	screen_trashed = 1;
362a5f0fb15SPaul Saab #if defined(SIGWINCH) || defined(SIGWIND)
363a5f0fb15SPaul Saab 	/* {{ Probably don't need this here. }} */
364a5f0fb15SPaul Saab 	winch(0);
365a5f0fb15SPaul Saab #endif
366a5f0fb15SPaul Saab 	return (0);
367a5f0fb15SPaul Saab }
368a5f0fb15SPaul Saab 
369a5f0fb15SPaul Saab #endif
370