main.c revision 170259 
1/* $FreeBSD: head/contrib/less/main.c 170259 2007-06-04 01:43:11Z delphij $ */
2/*
3 * Copyright (C) 1984-2007  Mark Nudelman
4 *
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Less License, as specified in the README file.
7 *
8 * For more information about less, or for information on how to
9 * contact the author, see the README file.
10 */
11
12
13/*
14 * Entry point, initialization, miscellaneous routines.
15 */
16
17#include "less.h"
18#if MSDOS_COMPILER==WIN32C
19#include <windows.h>
20#endif
21
22public char *	every_first_cmd = NULL;
23public int	new_file;
24public int	is_tty;
25public IFILE	curr_ifile = NULL_IFILE;
26public IFILE	old_ifile = NULL_IFILE;
27public struct scrpos initial_scrpos;
28public int	any_display = FALSE;
29public POSITION	start_attnpos = NULL_POSITION;
30public POSITION	end_attnpos = NULL_POSITION;
31public int	wscroll;
32public char *	progname;
33public int	quitting;
34public int	secure;
35public int	dohelp;
36public int	less_is_more;
37
38#if LOGFILE
39public int	logfile = -1;
40public int	force_logfile = FALSE;
41public char *	namelogfile = NULL;
42#endif
43
44#if EDITOR
45public char *	editor;
46public char *	editproto;
47#endif
48
49#if TAGS
50extern char *	tags;
51extern char *	tagoption;
52extern int	jump_sline;
53#endif
54
55#ifdef WIN32
56static char consoleTitle[256];
57#endif
58
59extern int	missing_cap;
60extern int	know_dumb;
61extern int	quit_if_one_screen;
62extern int	pr_type;
63
64
65/*
66 * Entry point.
67 */
68int
69main(argc, argv)
70	int argc;
71	char *argv[];
72{
73	IFILE ifile;
74	char *s;
75	extern char *__progname;
76
77#ifdef __EMX__
78	_response(&argc, &argv);
79	_wildcard(&argc, &argv);
80#endif
81
82	progname = *argv++;
83	argc--;
84
85	secure = 0;
86	s = lgetenv("LESSSECURE");
87	if (s != NULL && *s != '\0')
88		secure = 1;
89
90#ifdef WIN32
91	if (getenv("HOME") == NULL)
92	{
93		/*
94		 * If there is no HOME environment variable,
95		 * try the concatenation of HOMEDRIVE + HOMEPATH.
96		 */
97		char *drive = getenv("HOMEDRIVE");
98		char *path  = getenv("HOMEPATH");
99		if (drive != NULL && path != NULL)
100		{
101			char *env = (char *) ecalloc(strlen(drive) +
102					strlen(path) + 6, sizeof(char));
103			strcpy(env, "HOME=");
104			strcat(env, drive);
105			strcat(env, path);
106			putenv(env);
107		}
108	}
109	GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char));
110#endif /* WIN32 */
111
112	/*
113	 * Process command line arguments and LESS environment arguments.
114	 * Command line arguments override environment arguments.
115	 */
116	is_tty = isatty(1);
117	get_term();
118	init_cmds();
119	init_charset();
120	init_line();
121	init_cmdhist();
122	init_option();
123
124	/*
125	 * If the name of the executable program is "more",
126	 * act like LESS_IS_MORE is set.
127	 */
128	for (s = progname + strlen(progname);  s > progname;  s--)
129	{
130		if (s[-1] == PATHNAME_SEP[0])
131			break;
132	}
133	if (strcmp(s, "more") == 0)
134		less_is_more = 1;
135
136	init_prompt();
137
138	s = lgetenv(less_is_more ? "MORE" : "LESS");
139	if (s != NULL)
140		scan_option(save(s));
141
142#define	isoptstring(s)	(((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0')
143	while (argc > 0 && (isoptstring(*argv) || isoptpending()))
144	{
145		s = *argv++;
146		argc--;
147		if (strcmp(s, "--") == 0)
148			break;
149		scan_option(s);
150	}
151#undef isoptstring
152
153	if (isoptpending())
154	{
155		/*
156		 * Last command line option was a flag requiring a
157		 * following string, but there was no following string.
158		 */
159		nopendopt();
160		quit(QUIT_OK);
161	}
162
163	if (less_is_more && get_quit_at_eof())
164		quit_if_one_screen = TRUE;
165
166#if EDITOR
167	editor = lgetenv("VISUAL");
168	if (editor == NULL || *editor == '\0')
169	{
170		editor = lgetenv("EDITOR");
171		if (editor == NULL || *editor == '\0')
172			editor = EDIT_PGM;
173	}
174	editproto = lgetenv("LESSEDIT");
175	if (editproto == NULL || *editproto == '\0')
176		editproto = "%E ?lm+%lm. %f";
177#endif
178
179	/*
180	 * Call get_ifile with all the command line filenames
181	 * to "register" them with the ifile system.
182	 */
183	ifile = NULL_IFILE;
184	if (dohelp)
185		ifile = get_ifile(FAKE_HELPFILE, ifile);
186	while (argc-- > 0)
187	{
188		char *filename;
189#if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC)
190		/*
191		 * Because the "shell" doesn't expand filename patterns,
192		 * treat each argument as a filename pattern rather than
193		 * a single filename.
194		 * Expand the pattern and iterate over the expanded list.
195		 */
196		struct textlist tlist;
197		char *gfilename;
198
199		gfilename = lglob(*argv++);
200		init_textlist(&tlist, gfilename);
201		filename = NULL;
202		while ((filename = forw_textlist(&tlist, filename)) != NULL)
203		{
204			(void) get_ifile(filename, ifile);
205			ifile = prev_ifile(NULL_IFILE);
206		}
207		free(gfilename);
208#else
209		filename = shell_quote(*argv);
210		if (filename == NULL)
211			filename = *argv;
212		argv++;
213		(void) get_ifile(filename, ifile);
214		ifile = prev_ifile(NULL_IFILE);
215#endif
216	}
217	/*
218	 * Set up terminal, etc.
219	 */
220	if (!is_tty)
221	{
222		/*
223		 * Output is not a tty.
224		 * Just copy the input file(s) to output.
225		 */
226		SET_BINARY(1);
227		if (nifile() == 0)
228		{
229			if (edit_stdin() == 0)
230				cat_file();
231		} else if (edit_first() == 0)
232		{
233			do {
234				cat_file();
235			} while (edit_next(1) == 0);
236		}
237		quit(QUIT_OK);
238	}
239
240	if (missing_cap && !know_dumb)
241		error("WARNING: terminal is not fully functional", NULL_PARG);
242	init_mark();
243	open_getchr();
244	raw_mode(1);
245	init_signals(1);
246
247	/*
248	 * Select the first file to examine.
249	 */
250#if TAGS
251	if (tagoption != NULL || strcmp(tags, "-") == 0)
252	{
253		/*
254		 * A -t option was given.
255		 * Verify that no filenames were also given.
256		 * Edit the file selected by the "tags" search,
257		 * and search for the proper line in the file.
258		 */
259		if (nifile() > 0)
260		{
261			error("No filenames allowed with -t option", NULL_PARG);
262			quit(QUIT_ERROR);
263		}
264		findtag(tagoption);
265		if (edit_tagfile())  /* Edit file which contains the tag */
266			quit(QUIT_ERROR);
267		/*
268		 * Search for the line which contains the tag.
269		 * Set up initial_scrpos so we display that line.
270		 */
271		initial_scrpos.pos = tagsearch();
272		if (initial_scrpos.pos == NULL_POSITION)
273			quit(QUIT_ERROR);
274		initial_scrpos.ln = jump_sline;
275	} else
276#endif
277	if (nifile() == 0)
278	{
279		if (edit_stdin())  /* Edit standard input */
280			quit(QUIT_ERROR);
281	} else
282	{
283		if (edit_first())  /* Edit first valid file in cmd line */
284			quit(QUIT_ERROR);
285	}
286
287	init();
288	commands();
289	quit(QUIT_OK);
290	/*NOTREACHED*/
291	return (0);
292}
293
294/*
295 * Copy a string to a "safe" place
296 * (that is, to a buffer allocated by calloc).
297 */
298	public char *
299save(s)
300	char *s;
301{
302	register char *p;
303
304	p = (char *) ecalloc(strlen(s)+1, sizeof(char));
305	strcpy(p, s);
306	return (p);
307}
308
309/*
310 * Allocate memory.
311 * Like calloc(), but never returns an error (NULL).
312 */
313	public VOID_POINTER
314ecalloc(count, size)
315	int count;
316	unsigned int size;
317{
318	register VOID_POINTER p;
319
320	p = (VOID_POINTER) calloc(count, size);
321	if (p != NULL)
322		return (p);
323	error("Cannot allocate memory", NULL_PARG);
324	quit(QUIT_ERROR);
325	/*NOTREACHED*/
326	return (NULL);
327}
328
329/*
330 * Skip leading spaces in a string.
331 */
332	public char *
333skipsp(s)
334	register char *s;
335{
336	while (*s == ' ' || *s == '\t')
337		s++;
338	return (s);
339}
340
341/*
342 * See how many characters of two strings are identical.
343 * If uppercase is true, the first string must begin with an uppercase
344 * character; the remainder of the first string may be either case.
345 */
346	public int
347sprefix(ps, s, uppercase)
348	char *ps;
349	char *s;
350	int uppercase;
351{
352	register int c;
353	register int sc;
354	register int len = 0;
355
356	for ( ;  *s != '\0';  s++, ps++)
357	{
358		c = *ps;
359		if (uppercase)
360		{
361			if (len == 0 && ASCII_IS_LOWER(c))
362				return (-1);
363			if (ASCII_IS_UPPER(c))
364				c = ASCII_TO_LOWER(c);
365		}
366		sc = *s;
367		if (len > 0 && ASCII_IS_UPPER(sc))
368			sc = ASCII_TO_LOWER(sc);
369		if (c != sc)
370			break;
371		len++;
372	}
373	return (len);
374}
375
376/*
377 * Exit the program.
378 */
379	public void
380quit(status)
381	int status;
382{
383	static int save_status;
384
385	/*
386	 * Put cursor at bottom left corner, clear the line,
387	 * reset the terminal modes, and exit.
388	 */
389	if (status < 0)
390		status = save_status;
391	else
392		save_status = status;
393	quitting = 1;
394	edit((char*)NULL);
395	save_cmdhist();
396	if (any_display && is_tty)
397		clear_bot();
398	deinit();
399	flush();
400	raw_mode(0);
401#if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC
402	/*
403	 * If we don't close 2, we get some garbage from
404	 * 2's buffer when it flushes automatically.
405	 * I cannot track this one down  RB
406	 * The same bug shows up if we use ^C^C to abort.
407	 */
408	close(2);
409#endif
410#if WIN32
411	SetConsoleTitle(consoleTitle);
412#endif
413	close_getchr();
414	exit(status);
415}
416