xref: /freebsd/contrib/less/lsystem.c (revision b7780dbe98fc88da65024e697529ea7883064275)
1a5f0fb15SPaul Saab /*
2*b7780dbeSXin LI  * Copyright (C) 1984-2019  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  *
796e55cc7SXin LI  * For more information, see the README file.
8a5f0fb15SPaul Saab  */
9a5f0fb15SPaul Saab 
10a5f0fb15SPaul Saab 
11a5f0fb15SPaul Saab /*
12a5f0fb15SPaul Saab  * Routines to execute other programs.
13a5f0fb15SPaul Saab  * Necessarily very OS dependent.
14a5f0fb15SPaul Saab  */
15a5f0fb15SPaul Saab 
16a5f0fb15SPaul Saab #include "less.h"
17c9346414SPaul Saab #include <signal.h>
18a5f0fb15SPaul Saab #include "position.h"
19a5f0fb15SPaul Saab 
20a5f0fb15SPaul Saab #if MSDOS_COMPILER
21a5f0fb15SPaul Saab #include <dos.h>
22*b7780dbeSXin LI #if MSDOS_COMPILER==WIN32C && defined(MINGW)
23*b7780dbeSXin LI #include <direct.h>
24*b7780dbeSXin LI #define setdisk(n) _chdrive((n)+1)
25*b7780dbeSXin LI #else
26a5f0fb15SPaul Saab #ifdef _MSC_VER
27a5f0fb15SPaul Saab #include <direct.h>
28a5f0fb15SPaul Saab #define setdisk(n) _chdrive((n)+1)
29a5f0fb15SPaul Saab #else
30a5f0fb15SPaul Saab #include <dir.h>
31a5f0fb15SPaul Saab #endif
32a5f0fb15SPaul Saab #endif
33*b7780dbeSXin LI #endif
34a5f0fb15SPaul Saab 
35a5f0fb15SPaul Saab extern int screen_trashed;
36a5f0fb15SPaul Saab extern IFILE curr_ifile;
37a5f0fb15SPaul Saab 
38a5f0fb15SPaul Saab 
39a5f0fb15SPaul Saab #if HAVE_SYSTEM
40a5f0fb15SPaul Saab 
41a5f0fb15SPaul Saab /*
42a5f0fb15SPaul Saab  * Pass the specified command to a shell to be executed.
43a5f0fb15SPaul Saab  * Like plain "system()", but handles resetting terminal modes, etc.
44a5f0fb15SPaul Saab  */
45a5f0fb15SPaul Saab 	public void
46f6b74a7dSXin LI lsystem(cmd, donemsg)
47f6b74a7dSXin LI 	char *cmd;
48f6b74a7dSXin LI 	char *donemsg;
49a5f0fb15SPaul Saab {
501ea31627SRobert Watson 	int inp;
51a5f0fb15SPaul Saab #if HAVE_SHELL
521ea31627SRobert Watson 	char *shell;
531ea31627SRobert Watson 	char *p;
54a5f0fb15SPaul Saab #endif
55a5f0fb15SPaul Saab 	IFILE save_ifile;
567374caaaSXin LI #if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C
57a5f0fb15SPaul Saab 	char cwd[FILENAME_MAX+1];
58a5f0fb15SPaul Saab #endif
59a5f0fb15SPaul Saab 
60a5f0fb15SPaul Saab 	/*
61a5f0fb15SPaul Saab 	 * Print the command which is to be executed,
62a5f0fb15SPaul Saab 	 * unless the command starts with a "-".
63a5f0fb15SPaul Saab 	 */
64a5f0fb15SPaul Saab 	if (cmd[0] == '-')
65a5f0fb15SPaul Saab 		cmd++;
66a5f0fb15SPaul Saab 	else
67a5f0fb15SPaul Saab 	{
68a5f0fb15SPaul Saab 		clear_bot();
69a5f0fb15SPaul Saab 		putstr("!");
70a5f0fb15SPaul Saab 		putstr(cmd);
71a5f0fb15SPaul Saab 		putstr("\n");
72a5f0fb15SPaul Saab 	}
73a5f0fb15SPaul Saab 
74a5f0fb15SPaul Saab #if MSDOS_COMPILER
757374caaaSXin LI #if MSDOS_COMPILER==WIN32C
767374caaaSXin LI 	if (*cmd == '\0')
777374caaaSXin LI 		cmd = getenv("COMSPEC");
787374caaaSXin LI #else
79a5f0fb15SPaul Saab 	/*
80a5f0fb15SPaul Saab 	 * Working directory is global on MSDOS.
81a5f0fb15SPaul Saab 	 * The child might change the working directory, so we
82a5f0fb15SPaul Saab 	 * must save and restore CWD across calls to "system",
83a5f0fb15SPaul Saab 	 * or else we won't find our file when we return and
84a5f0fb15SPaul Saab 	 * try to "reedit_ifile" it.
85a5f0fb15SPaul Saab 	 */
86a5f0fb15SPaul Saab 	getcwd(cwd, FILENAME_MAX);
87a5f0fb15SPaul Saab #endif
887374caaaSXin LI #endif
89a5f0fb15SPaul Saab 
90a5f0fb15SPaul Saab 	/*
91a5f0fb15SPaul Saab 	 * Close the current input file.
92a5f0fb15SPaul Saab 	 */
93a5f0fb15SPaul Saab 	save_ifile = save_curr_ifile();
94a5f0fb15SPaul Saab 	(void) edit_ifile(NULL_IFILE);
95a5f0fb15SPaul Saab 
96a5f0fb15SPaul Saab 	/*
97a5f0fb15SPaul Saab 	 * De-initialize the terminal and take out of raw mode.
98a5f0fb15SPaul Saab 	 */
99a5f0fb15SPaul Saab 	deinit();
100a5f0fb15SPaul Saab 	flush();	/* Make sure the deinit chars get out */
101a5f0fb15SPaul Saab 	raw_mode(0);
102a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
103a5f0fb15SPaul Saab 	close_getchr();
104a5f0fb15SPaul Saab #endif
105a5f0fb15SPaul Saab 
106a5f0fb15SPaul Saab 	/*
107a5f0fb15SPaul Saab 	 * Restore signals to their defaults.
108a5f0fb15SPaul Saab 	 */
109a5f0fb15SPaul Saab 	init_signals(0);
110a5f0fb15SPaul Saab 
111a5f0fb15SPaul Saab #if HAVE_DUP
112a5f0fb15SPaul Saab 	/*
113a5f0fb15SPaul Saab 	 * Force standard input to be the user's terminal
114a5f0fb15SPaul Saab 	 * (the normal standard input), even if less's standard input
115a5f0fb15SPaul Saab 	 * is coming from a pipe.
116a5f0fb15SPaul Saab 	 */
117a5f0fb15SPaul Saab 	inp = dup(0);
118a5f0fb15SPaul Saab 	close(0);
119c9346414SPaul Saab #if OS2
120c9346414SPaul Saab 	/* The __open() system call translates "/dev/tty" to "con". */
121c9346414SPaul Saab 	if (__open("/dev/tty", OPEN_READ) < 0)
122c9346414SPaul Saab #else
123a5f0fb15SPaul Saab 	if (open("/dev/tty", OPEN_READ) < 0)
124c9346414SPaul Saab #endif
125a5f0fb15SPaul Saab 		dup(inp);
126a5f0fb15SPaul Saab #endif
127a5f0fb15SPaul Saab 
128a5f0fb15SPaul Saab 	/*
129a5f0fb15SPaul Saab 	 * Pass the command to the system to be executed.
130a5f0fb15SPaul Saab 	 * If we have a SHELL environment variable, use
131a5f0fb15SPaul Saab 	 * <$SHELL -c "command"> instead of just <command>.
132a5f0fb15SPaul Saab 	 * If the command is empty, just invoke a shell.
133a5f0fb15SPaul Saab 	 */
134a5f0fb15SPaul Saab #if HAVE_SHELL
135a5f0fb15SPaul Saab 	p = NULL;
136a5f0fb15SPaul Saab 	if ((shell = lgetenv("SHELL")) != NULL && *shell != '\0')
137a5f0fb15SPaul Saab 	{
138a5f0fb15SPaul Saab 		if (*cmd == '\0')
139a5f0fb15SPaul Saab 			p = save(shell);
140a5f0fb15SPaul Saab 		else
141a5f0fb15SPaul Saab 		{
142000ba3e8STim J. Robbins 			char *esccmd = shell_quote(cmd);
143000ba3e8STim J. Robbins 			if (esccmd != NULL)
144a5f0fb15SPaul Saab 			{
145a15691bfSXin LI 				int len = (int) (strlen(shell) + strlen(esccmd) + 5);
1466dcb072bSXin LI 				p = (char *) ecalloc(len, sizeof(char));
1476dcb072bSXin LI 				SNPRINTF3(p, len, "%s %s %s", shell, shell_coption(), esccmd);
148a5f0fb15SPaul Saab 				free(esccmd);
149a5f0fb15SPaul Saab 			}
150a5f0fb15SPaul Saab 		}
151a5f0fb15SPaul Saab 	}
152a5f0fb15SPaul Saab 	if (p == NULL)
153a5f0fb15SPaul Saab 	{
154a5f0fb15SPaul Saab 		if (*cmd == '\0')
155a5f0fb15SPaul Saab 			p = save("sh");
156a5f0fb15SPaul Saab 		else
157a5f0fb15SPaul Saab 			p = save(cmd);
158a5f0fb15SPaul Saab 	}
159a5f0fb15SPaul Saab 	system(p);
160a5f0fb15SPaul Saab 	free(p);
161a5f0fb15SPaul Saab #else
162a5f0fb15SPaul Saab #if MSDOS_COMPILER==DJGPPC
163a5f0fb15SPaul Saab 	/*
164a5f0fb15SPaul Saab 	 * Make stdin of the child be in cooked mode.
165a5f0fb15SPaul Saab 	 */
166a5f0fb15SPaul Saab 	setmode(0, O_TEXT);
167a5f0fb15SPaul Saab 	/*
168a5f0fb15SPaul Saab 	 * We don't need to catch signals of the child (it
169a5f0fb15SPaul Saab 	 * also makes trouble with some DPMI servers).
170a5f0fb15SPaul Saab 	 */
171a5f0fb15SPaul Saab 	__djgpp_exception_toggle();
172a5f0fb15SPaul Saab   	system(cmd);
173a5f0fb15SPaul Saab 	__djgpp_exception_toggle();
174a5f0fb15SPaul Saab #else
175a5f0fb15SPaul Saab 	system(cmd);
176a5f0fb15SPaul Saab #endif
177a5f0fb15SPaul Saab #endif
178a5f0fb15SPaul Saab 
179a5f0fb15SPaul Saab #if HAVE_DUP
180a5f0fb15SPaul Saab 	/*
181a5f0fb15SPaul Saab 	 * Restore standard input, reset signals, raw mode, etc.
182a5f0fb15SPaul Saab 	 */
183a5f0fb15SPaul Saab 	close(0);
184a5f0fb15SPaul Saab 	dup(inp);
185a5f0fb15SPaul Saab 	close(inp);
186a5f0fb15SPaul Saab #endif
187a5f0fb15SPaul Saab 
188a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
189a5f0fb15SPaul Saab 	open_getchr();
190a5f0fb15SPaul Saab #endif
191a5f0fb15SPaul Saab 	init_signals(1);
192a5f0fb15SPaul Saab 	raw_mode(1);
193a5f0fb15SPaul Saab 	if (donemsg != NULL)
194a5f0fb15SPaul Saab 	{
195a5f0fb15SPaul Saab 		putstr(donemsg);
196a5f0fb15SPaul Saab 		putstr("  (press RETURN)");
197a5f0fb15SPaul Saab 		get_return();
198a5f0fb15SPaul Saab 		putchr('\n');
199a5f0fb15SPaul Saab 		flush();
200a5f0fb15SPaul Saab 	}
201a5f0fb15SPaul Saab 	init();
202a5f0fb15SPaul Saab 	screen_trashed = 1;
203a5f0fb15SPaul Saab 
2047374caaaSXin LI #if MSDOS_COMPILER && MSDOS_COMPILER!=WIN32C
205a5f0fb15SPaul Saab 	/*
206a5f0fb15SPaul Saab 	 * Restore the previous directory (possibly
207a5f0fb15SPaul Saab 	 * changed by the child program we just ran).
208a5f0fb15SPaul Saab 	 */
209a5f0fb15SPaul Saab 	chdir(cwd);
210a5f0fb15SPaul Saab #if MSDOS_COMPILER != DJGPPC
211a5f0fb15SPaul Saab 	/*
212a5f0fb15SPaul Saab 	 * Some versions of chdir() don't change to the drive
213a5f0fb15SPaul Saab 	 * which is part of CWD.  (DJGPP does this in chdir.)
214a5f0fb15SPaul Saab 	 */
215a5f0fb15SPaul Saab 	if (cwd[1] == ':')
216a5f0fb15SPaul Saab 	{
217a5f0fb15SPaul Saab 		if (cwd[0] >= 'a' && cwd[0] <= 'z')
218a5f0fb15SPaul Saab 			setdisk(cwd[0] - 'a');
219a5f0fb15SPaul Saab 		else if (cwd[0] >= 'A' && cwd[0] <= 'Z')
220a5f0fb15SPaul Saab 			setdisk(cwd[0] - 'A');
221a5f0fb15SPaul Saab 	}
222a5f0fb15SPaul Saab #endif
223a5f0fb15SPaul Saab #endif
224a5f0fb15SPaul Saab 
225a5f0fb15SPaul Saab 	/*
226a5f0fb15SPaul Saab 	 * Reopen the current input file.
227a5f0fb15SPaul Saab 	 */
228a5f0fb15SPaul Saab 	reedit_ifile(save_ifile);
229a5f0fb15SPaul Saab 
230a5f0fb15SPaul Saab #if defined(SIGWINCH) || defined(SIGWIND)
231a5f0fb15SPaul Saab 	/*
232a5f0fb15SPaul Saab 	 * Since we were ignoring window change signals while we executed
233a5f0fb15SPaul Saab 	 * the system command, we must assume the window changed.
234a5f0fb15SPaul Saab 	 * Warning: this leaves a signal pending (in "sigs"),
235a5f0fb15SPaul Saab 	 * so psignals() should be called soon after lsystem().
236a5f0fb15SPaul Saab 	 */
237a5f0fb15SPaul Saab 	winch(0);
238a5f0fb15SPaul Saab #endif
239a5f0fb15SPaul Saab }
240a5f0fb15SPaul Saab 
241a5f0fb15SPaul Saab #endif
242a5f0fb15SPaul Saab 
243a5f0fb15SPaul Saab #if PIPEC
244a5f0fb15SPaul Saab 
245a5f0fb15SPaul Saab /*
246a5f0fb15SPaul Saab  * Pipe a section of the input file into the given shell command.
247a5f0fb15SPaul Saab  * The section to be piped is the section "between" the current
248a5f0fb15SPaul Saab  * position and the position marked by the given letter.
249a5f0fb15SPaul Saab  *
250a5f0fb15SPaul Saab  * If the mark is after the current screen, the section between
251a5f0fb15SPaul Saab  * the top line displayed and the mark is piped.
252a5f0fb15SPaul Saab  * If the mark is before the current screen, the section between
253a5f0fb15SPaul Saab  * the mark and the bottom line displayed is piped.
254a5f0fb15SPaul Saab  * If the mark is on the current screen, or if the mark is ".",
255a5f0fb15SPaul Saab  * the whole current screen is piped.
256a5f0fb15SPaul Saab  */
257a5f0fb15SPaul Saab 	public int
258f6b74a7dSXin LI pipe_mark(c, cmd)
259f6b74a7dSXin LI 	int c;
260f6b74a7dSXin LI 	char *cmd;
261a5f0fb15SPaul Saab {
262a5f0fb15SPaul Saab 	POSITION mpos, tpos, bpos;
263a5f0fb15SPaul Saab 
264a5f0fb15SPaul Saab 	/*
265a5f0fb15SPaul Saab 	 * mpos = the marked position.
266a5f0fb15SPaul Saab 	 * tpos = top of screen.
267a5f0fb15SPaul Saab 	 * bpos = bottom of screen.
268a5f0fb15SPaul Saab 	 */
269a5f0fb15SPaul Saab 	mpos = markpos(c);
270a5f0fb15SPaul Saab 	if (mpos == NULL_POSITION)
271a5f0fb15SPaul Saab 		return (-1);
272a5f0fb15SPaul Saab 	tpos = position(TOP);
273a5f0fb15SPaul Saab 	if (tpos == NULL_POSITION)
274a5f0fb15SPaul Saab 		tpos = ch_zero();
275a5f0fb15SPaul Saab 	bpos = position(BOTTOM);
276a5f0fb15SPaul Saab 
277a5f0fb15SPaul Saab  	if (c == '.')
278a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, bpos));
279a5f0fb15SPaul Saab  	else if (mpos <= tpos)
280a5f0fb15SPaul Saab  		return (pipe_data(cmd, mpos, bpos));
281a5f0fb15SPaul Saab  	else if (bpos == NULL_POSITION)
282a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, bpos));
283a5f0fb15SPaul Saab  	else
284a5f0fb15SPaul Saab  		return (pipe_data(cmd, tpos, mpos));
285a5f0fb15SPaul Saab }
286a5f0fb15SPaul Saab 
287a5f0fb15SPaul Saab /*
288a5f0fb15SPaul Saab  * Create a pipe to the given shell command.
289a5f0fb15SPaul Saab  * Feed it the file contents between the positions spos and epos.
290a5f0fb15SPaul Saab  */
291a5f0fb15SPaul Saab 	public int
292f6b74a7dSXin LI pipe_data(cmd, spos, epos)
293f6b74a7dSXin LI 	char *cmd;
294f6b74a7dSXin LI 	POSITION spos;
295f6b74a7dSXin LI 	POSITION epos;
296a5f0fb15SPaul Saab {
2971ea31627SRobert Watson 	FILE *f;
2981ea31627SRobert Watson 	int c;
299a5f0fb15SPaul Saab 
300a5f0fb15SPaul Saab 	/*
301a5f0fb15SPaul Saab 	 * This is structured much like lsystem().
302a5f0fb15SPaul Saab 	 * Since we're running a shell program, we must be careful
303a5f0fb15SPaul Saab 	 * to perform the necessary deinitialization before running
304a5f0fb15SPaul Saab 	 * the command, and reinitialization after it.
305a5f0fb15SPaul Saab 	 */
306a5f0fb15SPaul Saab 	if (ch_seek(spos) != 0)
307a5f0fb15SPaul Saab 	{
308a5f0fb15SPaul Saab 		error("Cannot seek to start position", NULL_PARG);
309a5f0fb15SPaul Saab 		return (-1);
310a5f0fb15SPaul Saab 	}
311a5f0fb15SPaul Saab 
312a5f0fb15SPaul Saab 	if ((f = popen(cmd, "w")) == NULL)
313a5f0fb15SPaul Saab 	{
314a5f0fb15SPaul Saab 		error("Cannot create pipe", NULL_PARG);
315a5f0fb15SPaul Saab 		return (-1);
316a5f0fb15SPaul Saab 	}
317a5f0fb15SPaul Saab 	clear_bot();
318a5f0fb15SPaul Saab 	putstr("!");
319a5f0fb15SPaul Saab 	putstr(cmd);
320a5f0fb15SPaul Saab 	putstr("\n");
321a5f0fb15SPaul Saab 
322a5f0fb15SPaul Saab 	deinit();
323a5f0fb15SPaul Saab 	flush();
324a5f0fb15SPaul Saab 	raw_mode(0);
325a5f0fb15SPaul Saab 	init_signals(0);
326a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
327a5f0fb15SPaul Saab 	close_getchr();
328a5f0fb15SPaul Saab #endif
329a5f0fb15SPaul Saab #ifdef SIGPIPE
330a5f0fb15SPaul Saab 	LSIGNAL(SIGPIPE, SIG_IGN);
331a5f0fb15SPaul Saab #endif
332a5f0fb15SPaul Saab 
333a5f0fb15SPaul Saab 	c = EOI;
334a5f0fb15SPaul Saab 	while (epos == NULL_POSITION || spos++ <= epos)
335a5f0fb15SPaul Saab 	{
336a5f0fb15SPaul Saab 		/*
337a5f0fb15SPaul Saab 		 * Read a character from the file and give it to the pipe.
338a5f0fb15SPaul Saab 		 */
339a5f0fb15SPaul Saab 		c = ch_forw_get();
340a5f0fb15SPaul Saab 		if (c == EOI)
341a5f0fb15SPaul Saab 			break;
342a5f0fb15SPaul Saab 		if (putc(c, f) == EOF)
343a5f0fb15SPaul Saab 			break;
344a5f0fb15SPaul Saab 	}
345a5f0fb15SPaul Saab 
346a5f0fb15SPaul Saab 	/*
347a5f0fb15SPaul Saab 	 * Finish up the last line.
348a5f0fb15SPaul Saab 	 */
349a5f0fb15SPaul Saab  	while (c != '\n' && c != EOI )
350a5f0fb15SPaul Saab  	{
351a5f0fb15SPaul Saab  		c = ch_forw_get();
352a5f0fb15SPaul Saab  		if (c == EOI)
353a5f0fb15SPaul Saab  			break;
354a5f0fb15SPaul Saab  		if (putc(c, f) == EOF)
355a5f0fb15SPaul Saab  			break;
356a5f0fb15SPaul Saab  	}
357a5f0fb15SPaul Saab 
358a5f0fb15SPaul Saab 	pclose(f);
359a5f0fb15SPaul Saab 
360a5f0fb15SPaul Saab #ifdef SIGPIPE
361a5f0fb15SPaul Saab 	LSIGNAL(SIGPIPE, SIG_DFL);
362a5f0fb15SPaul Saab #endif
363a5f0fb15SPaul Saab #if MSDOS_COMPILER==WIN32C
364a5f0fb15SPaul Saab 	open_getchr();
365a5f0fb15SPaul Saab #endif
366a5f0fb15SPaul Saab 	init_signals(1);
367a5f0fb15SPaul Saab 	raw_mode(1);
368a5f0fb15SPaul Saab 	init();
369a5f0fb15SPaul Saab 	screen_trashed = 1;
370a5f0fb15SPaul Saab #if defined(SIGWINCH) || defined(SIGWIND)
371a5f0fb15SPaul Saab 	/* {{ Probably don't need this here. }} */
372a5f0fb15SPaul Saab 	winch(0);
373a5f0fb15SPaul Saab #endif
374a5f0fb15SPaul Saab 	return (0);
375a5f0fb15SPaul Saab }
376a5f0fb15SPaul Saab 
377a5f0fb15SPaul Saab #endif
378