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Comparing root-tail/root-tail.c (file contents):
Revision 1.3 by pcg, Sun May 5 19:10:39 2002 UTC vs.
Revision 1.37 by pcg, Wed Mar 31 01:47:50 2004 UTC

1	/*	1	/*
2	* Copyright 2001 by Marco d'Itri <md@linux.it>	2	* Copyright 2001 by Marco d'Itri <md@linux.it>
3	*	3	* Copyright 2000,2001,2002,2003,2004
4	* Original version by Mike Baker, then maintained by pcg@goof.com.	4	* Marc Lehmann <pcg@goof.com>,
		5	* and many others, see README
		6	*
		7	* Original version by Mike Baker.
5	*	8	*
6	* This program is free software; you can redistribute it and/or modify	9	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by	10	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or	11	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.	12	* (at your option) any later version.
…		…
28	#include <fcntl.h>	31	#include <fcntl.h>
29	#include <errno.h>	32	#include <errno.h>
30	#include <sys/time.h>	33	#include <sys/time.h>
31	#include <sys/stat.h>	34	#include <sys/stat.h>
32	#include <sys/types.h>	35	#include <sys/types.h>
		36	#include <locale.h>
		37	#include <ctype.h>
		38	#include <stdarg.h>
		39	#include <X11/Xlib.h>
		40	#include <X11/Xatom.h>
		41	#include <X11/Xutil.h>
		42
33	#if HAS_REGEX	43	#if HAS_REGEX
34	#include <regex.h>	44	#include <regex.h>
35	#endif	45	#endif
36	#include <X11/Xlib.h>	46
37	#include <X11/Xutil.h>	47	#define SHADE_X 2
		48	#define SHADE_Y 2
38		49
39	/* data structures */	50	/* data structures */
40	struct logfile_entry {	51	struct logfile_entry
41	char *fname; /* name of file */	52	{
42	char *desc; /* alternative description */
43	FILE *fp; /* FILE struct associated with file */
44	ino_t inode; /* inode of the file opened */
45	off_t last_size; /* file size at the last check */
46	unsigned long color; /* color to be used for printing */
47	struct logfile_entry *next;	53	struct logfile_entry *next;
		54
		55	char *fname; /* name of file */
		56	char *desc; /* alternative description */
		57	char *buf; /* text read but not yet displayed */
		58	FILE *fp; /* FILE struct associated with file */
		59	ino_t inode; /* inode of the file opened */
		60	off_t last_size; /* file size at the last check */
		61	unsigned long color; /* color to be used for printing */
		62	int partial; /* true if the last line isn't complete */
		63	int lastpartial; /* true if the previous output wasn't complete */
		64	int index; /* index into linematrix of a partial line */
		65	int modified; /* true if line is modified & needs displaying */
48	};	66	};
49		67
50	struct linematrix {	68	struct linematrix
		69	{
51	char *line;	70	char *line;
		71	int len;
52	unsigned long color;	72	unsigned long color;
53	};	73	};
54		74
		75	struct displaymatrix
		76	{
		77	char *line;
		78	int len;
		79	int buffer_size;
		80	};
55		81
56	/* global variables */	82	/* global variables */
57	unsigned int width = STD_WIDTH, listlen = STD_HEIGHT;	83	struct linematrix *lines;
		84	struct displaymatrix *display;
		85	int width = STD_WIDTH, height = STD_HEIGHT, listlen;
58	int win_x = LOC_X, win_y = LOC_Y;	86	int win_x = LOC_X, win_y = LOC_Y;
59	int w = -1, h = -1, font_width, font_height, font_descent;	87	int font_ascent, font_height;
		88	int effect_x_space, effect_y_space; /* how much space does shading / outlining take up */
		89	int effect_x_offset, effect_y_offset; /* and how does it offset the usable space */
60	int do_reopen;	90	int do_reopen;
61	struct timeval interval = { 2, 400000 }; /* see Knuth */	91	struct timeval interval = { 2, 400000 };
		92	XFontSet fontset;
62		93
63	/* command line options */	94	/* command line options */
64	int opt_noinitial, opt_shade, opt_frame, opt_reverse=0, opt_nofilename,	95	int opt_noinitial, opt_shade, opt_frame, opt_reverse, opt_nofilename,
		96	opt_outline, opt_noflicker, opt_whole, opt_update, opt_wordwrap,
65	geom_mask, reload = 3600;	97	geom_mask, reload = 0;
66	const char *command = NULL,	98	const char *command = NULL,
67	*fontname = USE_FONT, *dispname = NULL, *def_color = DEF_COLOR;	99	*fontname = USE_FONT, *dispname = NULL, *def_color = DEF_COLOR,
		100	*continuation = "[+]";
68		101
69	struct logfile_entry *loglist = NULL, *loglist_tail = NULL;	102	struct logfile_entry *loglist = NULL, *loglist_tail = NULL;
70		103
71	Display *disp;	104	Display *disp;
72	Window root;	105	Window root;
73	GC WinGC;	106	GC WinGC;
74		107
75	#if HAS_REGEX	108	#if HAS_REGEX
76	struct re_list {	109	struct re_list
		110	{
77	regex_t from;	111	regex_t from;
78	const char *to;	112	const char *to;
79	struct re_list *next;	113	struct re_list *next;
80	};	114	};
81	struct re_list *re_head, *re_tail;	115	struct re_list *re_head, *re_tail;
		116	char *transform_to = NULL;
		117	regex_t *transformre;
82	#endif	118	#endif
83		119
84		120
85	/* prototypes */	121	/* prototypes */
86	void list_files(int);	122	void list_files (int);
87	void force_reopen(int);	123	void force_reopen (int);
88	void force_refresh(int);	124	void force_refresh (int);
89	void blank_window(int);	125	void blank_window (int);
90		126
91	void InitWindow(void);	127	void InitWindow (void);
92	unsigned long GetColor(const char *);	128	unsigned long GetColor (const char *);
93	void redraw(void);	129	void redraw (int);
94	void refresh(struct linematrix *, int, int);	130	void refresh (int, int, int, int);
95		131
96	void transform_line(char *s);	132	void transform_line (char *s);
97	int lineinput(char *, int, FILE *);	133	int lineinput (struct logfile_entry *);
98	void reopen(void);	134	void reopen (void);
99	void check_open_files(void);	135	void check_open_files (void);
100	FILE *openlog(struct logfile_entry *);	136	FILE *openlog (struct logfile_entry *);
101	void main_loop(void);	137	static void main_loop (void);
102		138
103	void display_version(void);	139	void display_version (void);
104	void display_help(char *);	140	void display_help (char *);
105	void install_signal(int, void (*)(int));	141	void install_signal (int, void (*)(int));
106	void *xstrdup(const char *);	142	void *xstrdup (const char *);
107	void *xmalloc(size_t);	143	void *xmalloc (size_t);
		144	void *xrealloc (void *, size_t);
108	int daemonize(void);	145	int daemonize (void);
109		146
110	/* signal handlers */	147	/* signal handlers */
		148	void
111	void list_files(int dummy)	149	list_files (int dummy)
112	{	150	{
113	struct logfile_entry *e;	151	struct logfile_entry *e;
114		152
115	fprintf(stderr, "Files opened:\n");	153	fprintf (stderr, "Files opened:\n");
116	for (e = loglist; e; e = e->next)	154	for (e = loglist; e; e = e->next)
117	fprintf(stderr, "\t%s (%s)\n", e->fname, e->desc);	155	fprintf (stderr, "\t%s (%s)\n", e->fname, e->desc);
118	}	156	}
119		157
		158	void
120	void force_reopen(int dummy)	159	force_reopen (int dummy)
121	{	160	{
122	do_reopen = 1;	161	do_reopen = 1;
123	}	162	}
124		163
		164	void
125	void force_refresh(int dummy)	165	force_refresh (int dummy)
126	{	166	{
127	XClearWindow(disp, root);
128	redraw();	167	redraw (1);
129	}	168	}
130		169
		170	void
131	void blank_window(int dummy)	171	blank_window (int dummy)
132	{	172	{
133	XClearWindow(disp, root);	173	XClearArea (disp, root, win_x - 2, win_y - 2, width + 5, height + 5, False);
134	XFlush(disp);	174	XFlush (disp);
135	exit(0);	175	exit (0);
136	}	176	}
137		177
138	/* X related functions */	178	/* X related functions */
		179	unsigned long
139	unsigned long GetColor(const char *ColorName)	180	GetColor (const char *ColorName)
140	{	181	{
141	XColor Color;	182	XColor Color;
142	XWindowAttributes Attributes;	183	XWindowAttributes Attributes;
143		184
144	XGetWindowAttributes(disp, root, &Attributes);	185	XGetWindowAttributes (disp, root, &Attributes);
145	Color.pixel = 0;	186	Color.pixel = 0;
		187
146	if (!XParseColor(disp, Attributes.colormap, ColorName, &Color))	188	if (!XParseColor (disp, Attributes.colormap, ColorName, &Color))
147	fprintf(stderr, "can't parse %s\n", ColorName);	189	fprintf (stderr, "can't parse %s\n", ColorName);
148	else if (!XAllocColor(disp, Attributes.colormap, &Color))	190	else if (!XAllocColor (disp, Attributes.colormap, &Color))
149	fprintf(stderr, "can't allocate %s\n", ColorName);	191	fprintf (stderr, "can't allocate %s\n", ColorName);
		192
150	return Color.pixel;	193	return Color.pixel;
151	}	194	}
152		195
153	void InitWindow(void)	196	static Window
		197	root_window (Display * display, int screen_number)
154	{	198	{
155	XGCValues gcv;	199	Atom SWM_VROOT = XInternAtom (display, "__SWM_VROOT", False);
156	Font font;	200	Window real_root_window = RootWindow (display, screen_number);
157	unsigned long gcm;
158	XFontStruct *info;
159	int screen, ScreenWidth, ScreenHeight;
160		201
161	if (!(disp = XOpenDisplay(dispname))) {	202	if (root) /* root window set via option */
162	fprintf(stderr, "Can't open display %s.\n", dispname);	203	return root;
163	exit(1);	204
		205	if (SWM_VROOT != None)
164	}	206	{
165	screen = DefaultScreen(disp);	207	Window unused, *windows;
166	ScreenHeight = DisplayHeight(disp, screen);	208	unsigned int count;
167	ScreenWidth = DisplayWidth(disp, screen);
168	root = RootWindow(disp, screen);
169	gcm = GCBackground;
170	gcv.graphics_exposures = True;
171	WinGC = XCreateGC(disp, root, gcm, &gcv);
172	XMapWindow(disp, root);
173	XSetForeground(disp, WinGC, GetColor(DEF_COLOR));
174		209
175	font = XLoadFont(disp, fontname);	210	if (XQueryTree (display, real_root_window, &unused, &unused, &windows,
176	XSetFont(disp, WinGC, font);	211	&count))
177	info = XQueryFont(disp, font);
178	font_width = info->max_bounds.width;
179	font_descent = info->max_bounds.descent;
180	font_height = info->max_bounds.ascent + font_descent;
181
182	w = width * font_width;
183	h = listlen * font_height;
184	if (geom_mask & XNegative)
185	win_x = win_x + ScreenWidth - w;
186	if (geom_mask & YNegative)
187	win_y = win_y + ScreenHeight - h;
188
189	XSelectInput(disp, root, ExposureMask|FocusChangeMask);
190	}
191
192	char *
193	detabificate (char *s)
194	{
195	char * out;
196	int i, j;
197
198	out = malloc (8 * strlen (s) + 1);
199
200	for(i = 0, j = 0; s[i]; i++)
201	{
202	if (s[i] == '\t')
203	do	212	{
204	out[j++] = ' ';	213	int i;
205	while (j % 8);	214
		215	for (i = 0; i < count; i++)
		216	{
		217	Atom type;
		218	int format;
		219	unsigned long nitems, bytes_after_return;
		220	unsigned char *virtual_root_window;
		221
		222	if (XGetWindowProperty (display, windows[i], SWM_VROOT,
		223	0, 1, False, XA_WINDOW, &type, &format,
		224	&nitems, &bytes_after_return,
		225	&virtual_root_window) == Success)
		226	{
		227	if (type != None)
		228	{
		229	if (type == XA_WINDOW)
		230	{
		231	XFree (windows);
		232	return (Window) virtual_root_window;
		233	}
		234	else
		235	fprintf (stderr,
		236	"__SWM_VROOT property type mismatch");
		237	}
		238	}
		239	else
		240	fprintf (stderr,
		241	"failed to get __SWM_VROOT property on window 0x%lx",
		242	windows[i]);
		243	}
		244
		245	if (count)
		246	XFree (windows);
		247	}
206	else	248	else
207	out[j++] = s[i];	249	fprintf (stderr, "Can't query tree on root window 0x%lx",
		250	real_root_window);
		251	}
		252	else
		253	/* This shouldn't happen. The Xlib documentation is wrong BTW. */
		254	fprintf (stderr, "Can't intern atom __SWM_VROOT");
		255
		256	return real_root_window;
		257	}
		258
		259	void
		260	InitWindow (void)
		261	{
		262	XGCValues gcv;
		263	unsigned long gcm;
		264	int screen, ScreenWidth, ScreenHeight;
		265
		266	if (!(disp = XOpenDisplay (dispname)))
		267	{
		268	fprintf (stderr, "Can't open display %s.\n", dispname);
		269	exit (1);
		270	}
		271
		272	screen = DefaultScreen (disp);
		273	ScreenHeight = DisplayHeight (disp, screen);
		274	ScreenWidth = DisplayWidth (disp, screen);
		275
		276	root = root_window (disp, screen);
		277
		278	gcm = GCBackground;
		279	gcv.graphics_exposures = True;
		280	WinGC = XCreateGC (disp, root, gcm, &gcv);
		281	XMapWindow (disp, root);
		282	XSetForeground (disp, WinGC, GetColor (DEF_COLOR));
		283
		284	{
		285	char **missing_charset_list;
		286	int missing_charset_count;
		287	char *def_string;
		288
		289	fontset = XCreateFontSet (disp, fontname,
		290	&missing_charset_list, &missing_charset_count,
		291	&def_string);
		292
		293	if (missing_charset_count)
		294	{
		295	fprintf (stderr,
		296	"Missing charsets in String to FontSet conversion (%s)\n",
		297	missing_charset_list[0]);
		298	XFreeStringList (missing_charset_list);
208	}	299	}
		300	}
		301
		302	if (!fontset)
		303	{
		304	fprintf (stderr, "unable to create fontset, exiting.\n");
		305	exit (1);
		306	}
		307
		308	{
		309	XFontSetExtents *xfe = XExtentsOfFontSet (fontset);
		310
		311	font_height = xfe->max_logical_extent.height;
		312	font_ascent = -xfe->max_logical_extent.y;
		313	}
		314
		315	if (geom_mask & XNegative)
		316	win_x = win_x + ScreenWidth - width;
		317	if (geom_mask & YNegative)
		318	win_y = win_y + ScreenHeight - height;
		319
		320	if (opt_outline)
		321	{
		322	/* adding outline increases the total width and height by 2
		323	pixels each, and offsets the text one pixel right and one
		324	pixel down */
		325	effect_x_space = effect_y_space = 2;
		326	effect_x_offset = effect_y_offset = 1;
		327	}
		328	else if (opt_shade)
		329	{
		330	/* adding a shadow increases the space used */
		331	effect_x_space = abs(SHADE_X);
		332	effect_y_space = abs(SHADE_Y);
		333	/* if the shadow is to the right and below then we don't need
		334	* to move the text to make space for it, but shadows to the left
		335	* and above need accomodating */
		336	effect_x_offset = SHADE_X > 0 ? 0 : -SHADE_X;
		337	effect_y_offset = SHADE_Y > 0 ? 0 : -SHADE_Y;
		338	}
		339	else
		340	{
		341	effect_x_space = effect_y_space = 0;
		342	effect_x_offset = effect_y_offset = 0;
		343	}
		344
		345	/* if we are using -shade or -outline, there will be less usable
		346	* space for output */
		347	listlen = (height - effect_y_space) / font_height;
		348
		349	if (!listlen)
		350	{
		351	fprintf (stderr, "height too small for a single line, setting to %d\n",
		352	font_height);
		353	listlen = 1;
		354	}
		355
		356	/* leave the height how the user requested it. it might not all be
		357	* used, but this will allow the geometry to be tuned more accurately
		358	* (with the -frame option)
		359	* the old code did this:
		360	* height = listlen * font_height + effect_y_space; */
209		361
210	out[j] = '\0';	362	XSelectInput (disp, root, ExposureMask | FocusChangeMask);
211	return out;
212	}	363	}
213		364
214	/*	365	/*
215	* redraw does a complete redraw, rather than an update (i.e. the area	366	* if redraw() is passwd a non-zero argument, it does a complete
216	* gets cleared first)	367	* redraw, rather than an update. if the argument is zero (and
		368	* -noflicker is in effect) then only the lines which have changed
		369	* since the last draw are redrawn.
		370	*
217	* the rest is handled by regular refresh()'es	371	* the rest is handled by regular refresh()'es
218	*/	372	*/
219	void redraw(void)	373	void
		374	redraw (int redraw_all)
220	{	375	{
221	XClearArea(disp, root, win_x, win_y, w, h + font_descent + 2, True);	376	XSetClipMask (disp, WinGC, None);
		377	refresh (0, 32768, 1, redraw_all);
222	}	378	}
223		379
224	/* Just redraw everything without clearing (i.e. after an EXPOSE event) */	380	/* Just redraw everything without clearing (i.e. after an EXPOSE event) */
225	void refresh(struct linematrix *lines, int miny, int maxy)	381	void
		382	refresh (int miny, int maxy, int clear, int refresh_all)
226	{	383	{
227	int lin;	384	int lin;
228	int offset = (listlen + 1) * font_height;	385	int offset = listlen * font_height + font_ascent + effect_y_offset;
229	unsigned long black_color = GetColor("black");	386	unsigned long black_color = GetColor ("black");
230		387
231	miny -= win_y + font_height;	388	miny -= win_y + font_height;
232	maxy -= win_y - font_height;	389	maxy -= win_y - font_height;
233		390
		391	if (clear && !opt_noflicker)
		392	XClearArea (disp, root, win_x, win_y, width, height, False);
		393
234	for (lin = listlen; lin--;)	394	for (lin = listlen; lin--;)
		395	{
		396	struct linematrix *line = lines + (opt_reverse ? listlen - lin - 1 : lin);
		397	struct displaymatrix *display_line = display + lin;
		398
		399	offset -= font_height;
		400
		401	if (offset < miny || offset > maxy)
		402	continue;
		403
		404	/* if this line is a different than it was, then it
		405	* needs displaying */
		406	if (!opt_noflicker
		407	|| refresh_all
		408	|| display_line->len != line->len
		409	|| memcmp (display_line->line, line->line, line->len))
235	{	410	{
236	char *temp;	411	/* don't bother updating the record of what has been
		412	* displayed if -noflicker isn't in effect, since we redraw
		413	* the whole display every time anyway */
		414	if (opt_noflicker)
		415	{
		416	/* update the record of what has been displayed;
		417	* first make sure the buffer is big enough */
		418	if (display_line->buffer_size <= line->len)
		419	{
		420	display_line->buffer_size = line->len + 1;
		421	display_line->line = xrealloc (display_line->line, display_line->buffer_size);
		422	}
		423
		424	display_line->len = line->len;
		425	memcpy (display_line->line, line->line, line->len);
		426
		427	if (clear)
		428	XClearArea (disp, root, win_x, win_y + offset - font_ascent,
		429	width + effect_x_space, font_height + effect_y_space, False);
		430	}
		431
		432	if (opt_outline)
		433	{
		434	int x, y;
		435	XSetForeground (disp, WinGC, black_color);
		436
		437	for (x = -1; x < 2; x += 2)
		438	for (y = -1; y < 2; y += 2)
		439	XmbDrawString (disp, root, fontset, WinGC,
		440	win_x + effect_x_offset + x,
		441	win_y + y + offset,
		442	line->line, line->len);
		443	}
		444	else if (opt_shade)
		445	{
		446	XSetForeground (disp, WinGC, black_color);
		447	XmbDrawString (disp, root, fontset, WinGC,
		448	win_x + effect_x_offset + SHADE_X,
		449	win_y + offset + SHADE_Y,
		450	line->line, line->len);
		451	}
		452
		453	XSetForeground (disp, WinGC, line->color);
		454	XmbDrawString (disp, root, fontset, WinGC,
		455	win_x + effect_x_offset,
		456	win_y + offset,
		457	line->line, line->len);
		458	}
		459	}
		460
		461	if (opt_frame)
		462	{
		463	XSetForeground (disp, WinGC, GetColor (def_color));
		464	XDrawRectangle (disp, root, WinGC, win_x - 0, win_y - 0, width - 1, height - 1);
		465	}
		466	}
		467
		468	#if HAS_REGEX
		469	void
		470	transform_line (char *s)
		471	{
		472	#ifdef I_AM_Md
		473	int i;
		474	if (1)
		475	{
		476	for (i = 16; s[i]; i++)
		477	s[i] = s[i + 11];
		478	}
		479	s[i + 1] = '\0';
		480	#endif
		481
		482	if (transformre)
		483	{
		484	int i;
		485	regmatch_t matched[16];
		486
		487	i = regexec (transformre, s, 16, matched, 0);
		488	if (i == 0)
		489	{ /* matched */
		490	int match_start = matched[0].rm_so;
		491	int match_end = matched[0].rm_eo;
		492	int old_len = match_end - match_start;
		493	int new_len = strlen(transform_to);
		494	int old_whole_len = strlen(s);
		495	printf("regexp was matched by '%s' - replace with '%s'\n", s, transform_to);
		496	printf("match is from %d to %d\n",
		497	match_start, match_end);
		498	if (new_len > old_len) {
		499	s = xrealloc(s, old_whole_len + new_len - old_len);
		500	}
		501	if (new_len != old_len) {
		502	memcpy(s + match_end + new_len - old_len,
		503	s + match_end,
		504	old_whole_len - match_end);
		505	s[old_whole_len + new_len - old_len] = '\0';
		506	}
		507	memcpy(s + match_start,
		508	transform_to,
		509	new_len);
		510	printf("transformed to '%s'\n", s);
		511	}
		512	else
		513	{
		514	printf("regexp was not matched by '%s'\n", s);
		515	}
		516	}
		517	}
		518	#endif
		519
		520	char *
		521	concat_line (const char *p1, const char *p2)
		522	{
		523	int l1 = p1 ? strlen (p1) : 0;
		524	int l2 = strlen (p2);
		525	char *r = xmalloc (l1 + l2 + 1);
		526
		527	memcpy (r, p1, l1);
		528	memcpy (r + l1, p2, l2);
		529	r[l1 + l2] = 0;
		530
		531	return r;
		532	}
		533
		534	/*
		535	* HACK-1: This routine should read a single line, no matter how long.
		536	*/
		537	int
		538	lineinput (struct logfile_entry *logfile)
		539	{
		540	char buff[1024], *p = buff;
		541	int ch;
		542	/* HACK-2: add on the length of any partial line which we will be appending to */
		543	int ofs = logfile->buf ? strlen (logfile->buf) : 0;
		544
		545	do
		546	{
		547	ch = fgetc (logfile->fp);
		548
		549	if (ch == '\n' || ch == EOF)
		550	break;
		551	else if (ch == '\r')
		552	continue; /* skip */
		553	else if (ch == '\t')
		554	{
		555	do
		556	{
		557	*p++ = ' ';
		558	ofs++;
		559	}
		560	while (ofs & 7);
		561	}
		562	else
		563	{
		564	*p++ = ch;
		565	ofs++;
		566	}
		567	}
		568	while (p < buff + (sizeof buff) - 8 - 1);
		569
		570	if (p == buff && ch == EOF)
		571	return 0;
		572
		573	*p = 0;
		574
		575	p = concat_line (logfile->buf, buff);
		576	free (logfile->buf); logfile->buf = p;
		577
		578	logfile->lastpartial = logfile->partial;
		579	/* there are 3 ways we could have exited the loop: reading '\n',
		580	* reaching EOF, or filling the buffer; the 2nd and 3rd of these
		581	* both result in a partial line */
		582	logfile->partial = ch != '\n';
237		583
238	offset -= font_height;	584	if (logfile->partial && opt_whole)
239		585	return 0;
240	if (offset < miny || offset > maxy)
241	continue;
242
243	if (opt_reverse)
244	temp = detabificate (lines[listlen-lin-1].line);
245	else
246	temp = detabificate (lines[lin].line);
247
248	if (opt_shade)
249	{
250	XSetForeground (disp, WinGC, black_color);
251	XDrawString (disp, root, WinGC, win_x + 2, win_y + offset + 2,
252	temp, strlen (temp));
253	}
254
255	XSetForeground (disp, WinGC, lines[lin].color);
256	XDrawString (disp, root, WinGC, win_x, win_y + offset,
257	temp, strlen (temp));
258
259	free (temp);
260	}
261
262	if (opt_frame) {
263	int bot_y = win_y + h + font_descent + 2;
264
265	XDrawLine(disp, root, WinGC, win_x, win_y, win_x + w, win_y);
266	XDrawLine(disp, root, WinGC, win_x + w, win_y, win_x + w, bot_y);
267	XDrawLine(disp, root, WinGC, win_x + w, bot_y, win_x, bot_y);
268	XDrawLine(disp, root, WinGC, win_x, bot_y, win_x, win_y);
269	}
270	}
271		586
272	#if HAS_REGEX	587	#if HAS_REGEX
273	void transform_line(char *s)	588	transform_line (logfile->buf);
274	{
275	#ifdef I_AM_Md
276	int i;
277	if (1) {
278	for (i = 16; s[i]; i++)
279	s[i] = s[i + 11];
280	}
281	s[i + 1] = '\0';
282	#endif	589	#endif
283
284	if (transformre) {
285	int i;
286	regmatch_t matched[16];
287
288	i = regexec(&transformre, string, 16, matched, 0);
289	if (i == 0) { /* matched */
290	}
291	}
292	}
293	#endif
294
295
296	/*
297	* This routine should read 'width' characters and not more. However,
298	* we really want to read width + 1 charachters if the last char is a '\n',
299	* which we should remove afterwards. So, read width+1 chars and ungetc
300	* the last character if it's not a newline. This means 'string' must be
301	* width + 2 wide!
302	*/
303	int lineinput(char *string, int slen, FILE *f)
304	{
305	int len;
306
307	do {
308	if (fgets(string, slen, f) == NULL) /* EOF or Error */
309	return 0;	590	return 1;
310
311	len = strlen(string);
312	} while (len == 0);
313
314	if (string[len - 1] == '\n')
315	string[len - 1] = '\0'; /* erase newline */
316	else if (len >= slen - 1) {
317	ungetc(string[len - 1], f);
318	string[len - 1] = '\0';
319	}
320
321	#if HAS_REGEX
322	transform_line(string);
323	#endif
324	return len;
325	}	591	}
326		592
327	/* input: reads file->fname	593	/* input: reads file->fname
328	* output: fills file->fp, file->inode	594	* output: fills file->fp, file->inode
329	* returns file->fp	595	* returns file->fp
330	* in case of error, file->fp is NULL	596	* in case of error, file->fp is NULL
331	*/	597	*/
		598	FILE *
332	FILE *openlog(struct logfile_entry *file)	599	openlog (struct logfile_entry * file)
333	{	600	{
334	struct stat stats;	601	struct stat stats;
335		602
336	if ((file->fp = fopen(file->fname, "r")) == NULL) {	603	if ((file->fp = fopen (file->fname, "r")) == NULL)
		604	{
337	file->fp = NULL;	605	file->fp = NULL;
338	return NULL;	606	return NULL;
339	}	607	}
340		608
341	fstat(fileno(file->fp), &stats);	609	fstat (fileno (file->fp), &stats);
342	if (S_ISFIFO(stats.st_mode)) {	610	if (S_ISFIFO (stats.st_mode))
		611	{
343	if (fcntl(fileno(file->fp), F_SETFL, O_NONBLOCK) < 0)	612	if (fcntl (fileno (file->fp), F_SETFL, O_NONBLOCK) < 0)
344	perror("fcntl"), exit(1);	613	perror ("fcntl"), exit (1);
345	file->inode = 0;	614	file->inode = 0;
		615	}
346	} else	616	else
347	file->inode = stats.st_ino;	617	file->inode = stats.st_ino;
348		618
349	if (opt_noinitial)	619	if (opt_noinitial)
350	fseek (file->fp, 0, SEEK_END);	620	fseek (file->fp, 0, SEEK_END);
351	else if (stats.st_size > (listlen + 1) * width)	621	else if (stats.st_size > (listlen + 1) * width)
		622	fseek (file->fp, -((listlen + 2) * width), SEEK_END);
		623
		624	file->last_size = stats.st_size;
		625	return file->fp;
		626	}
		627
		628	void
		629	reopen (void)
		630	{
		631	struct logfile_entry *e;
		632
		633	for (e = loglist; e; e = e->next)
		634	{
		635	if (!e->inode)
		636	continue; /* skip stdin */
		637
		638	if (e->fp)
		639	fclose (e->fp);
		640	/* if fp is NULL we will try again later */
		641	openlog (e);
		642	}
		643
		644	do_reopen = 0;
		645	}
		646
		647	void
		648	check_open_files (void)
		649	{
		650	struct logfile_entry *e;
		651	struct stat stats;
		652
		653	for (e = loglist; e; e = e->next)
		654	{
		655	if (!e->inode)
		656	continue; /* skip stdin */
		657
		658	if (stat (e->fname, &stats) < 0)
		659	{ /* file missing? */
		660	sleep (1);
		661	if (e->fp)
		662	fclose (e->fp);
		663	if (openlog (e) == NULL)
		664	continue;
		665	if (fstat (fileno (e->fp), &stats) < 0)
		666	continue;
		667	}
		668
		669	if (stats.st_ino != e->inode)
		670	{ /* file renamed? */
		671	if (e->fp)
		672	fclose (e->fp);
		673	if (openlog (e) == NULL)
		674	continue;
		675	}
		676
		677	if (stats.st_size < e->last_size)
		678	{ /* file truncated? */
		679	fseek (e->fp, 0, SEEK_SET);
		680	e->last_size = stats.st_size;
		681	}
		682	}
		683	}
		684
		685	/*
		686	* insert a single physical line (that must be short enough to fit)
		687	* at position "idx" by pushing up lines above it. the caller
		688	* MUST then fill in lines[idx] with valid data.
		689	*/
		690	static void
		691	insert_line (int idx)
		692	{
		693	int cur_line;
		694	struct logfile_entry *current;
		695
		696	free (lines[0].line);
		697
		698	for (cur_line = 0; cur_line < idx; cur_line++)
		699	lines[cur_line] = lines[cur_line + 1];
		700
		701	for (current = loglist; current; current = current->next)
		702	if (current->index <= idx)
		703	current->index--;
		704	}
		705
		706	/*
		707	* remove a single physical line at position "idx" by moving the lines above it
		708	* down and inserting a "~" line at the top.
		709	*/
		710	static void
		711	delete_line (int idx)
		712	{
		713	int cur_line;
		714	struct logfile_entry *current;
		715
		716	for (cur_line = idx; cur_line > 0; cur_line--)
		717	lines[cur_line] = lines[cur_line - 1];
		718
		719	lines[0].line = xstrdup ("~");
		720
		721	for (current = loglist; current; current = current->next)
		722	if (current->index >= 0 && current->index <= idx)
		723	current->index++;
		724	}
		725
		726	/*
		727	* takes a logical log file line and splits it into multiple physical
		728	* screen lines by splitting it whenever a part becomes too long.
		729	* lal lines will be inserted at position "idx".
		730	*/
		731	static void
		732	split_line (int idx, const char *str, unsigned long color)
		733	{
		734	int l = strlen (str);
		735	int last_wrapped = 0;
		736	const char *p = str;
		737	static int continuation_width = -1;
		738	static int continuation_length;
		739
		740	/* only calculate the continuation's width once */
		741	if (continuation_width == -1)
		742	{
		743	continuation_length = strlen(continuation);
		744	continuation_width = XmbTextEscapement (fontset, continuation, continuation_length);
		745	}
		746
		747	do
		748	{
		749	const char *beg = p;
		750	int w = last_wrapped ? continuation_width : 0;
		751	int wrapped = 0;
		752	const char *break_p = NULL;
		753
		754	while (*p)
		755	{
		756	/* find the length in bytes of the next multibyte character */
		757	int len = mblen (p, l);
		758	if (len <= 0)
		759	len = 1; /* ignore (don't skip) illegal character sequences */
		760
		761	/* find the width in pixels of the next character */
		762	int cw = XmbTextEscapement (fontset, p, len);
		763	if (cw + w > width - effect_x_space)
		764	{
		765	if (p == beg)
		766	{
		767	fprintf(stderr, "we can't even fit a single character onto the line\n");
		768	if (len == 1) fprintf(stderr, "(the character we couldn't fit was '%c')\n", *p);
		769	exit(1);
		770	}
		771
		772	wrapped = 1;
		773	break;
		774	}
		775
		776	if (opt_wordwrap && len == 1 && p[0] == ' ')
		777	break_p = p;
		778
		779	w += cw;
		780	p += len;
		781	l -= len;
		782	}
		783
		784	/* if we're wrapping at spaces, and the line is long enough to
		785	* wrap, and we've seen a space already, and the space wasn't
		786	* the first character on the line, then wrap at the space */
		787	if (opt_wordwrap && wrapped && break_p && break_p != beg)
		788	{
		789	l += p - break_p;
		790	p = break_p;
		791	}
		792
352	{	793	{
353	char dummy[255];	794	/* HACK-4 - consider inserting the 'continuation string'
		795	* before the rest of the wrapped line */
		796	int len = p - beg + (last_wrapped ? continuation_length : 0);
		797	char *s = xmalloc (len + 1);
		798	if (last_wrapped)
		799	{
		800	memcpy (s, continuation, continuation_length);
		801	memcpy (s + continuation_length, beg, p - beg);
		802	}
		803	else
		804	memcpy (s, beg, len);
354		805
355	fseek(file->fp, -((listlen + 2) * width), SEEK_END);	806	s[len] = 0;
356	/* the pointer might point halfway some line. Let's	807	insert_line (idx);
357	be nice and skip this damaged line */	808	lines[idx].line = s;
358	lineinput(dummy, sizeof(dummy), file->fp);	809	lines[idx].len = len;
		810	lines[idx].color = color;
359	}	811	}
360		812
361	file->last_size = stats.st_size;	813	/* if we wrapped at a space, don't display the space */
362	return file->fp;	814	if (opt_wordwrap && wrapped && break_p && break_p != beg)
363	}	815	{
364		816	l--;
365	void reopen(void)	817	p++;
366	{
367	struct logfile_entry *e;
368
369	for (e = loglist; e; e = e->next) {
370	if (!e->inode)
371	continue; /* skip stdin */
372
373	if (e->fp)
374	fclose(e->fp);
375	/* if fp is NULL we will try again later */
376	openlog(e);
377	}
378
379	do_reopen = 0;
380	}
381
382	void check_open_files(void)
383	{
384	struct logfile_entry *e;
385	struct stat stats;
386
387	for (e = loglist; e; e = e->next) {
388	if (!e->inode)
389	continue; /* skip stdin */
390
391	if (stat(e->fname, &stats) < 0) { /* file missing? */
392	sleep(1);
393	if (e->fp)
394	fclose(e->fp);
395	if (openlog(e) == NULL)
396	break;
397	}	818	}
398		819
399	if (stats.st_ino != e->inode) { /* file renamed? */	820	last_wrapped = wrapped;
400	if (e->fp)	821	}
401	fclose(e->fp);	822	while (l);
		823	}
		824
		825	/*
		826	* append something to an existing physical line. this is done
		827	* by deleting the file on-screen, concatenating the new data to it
		828	* and splitting it again.
		829	*/
		830	static void
		831	append_line (int idx, const char *str)
		832	{
		833	unsigned long color = lines[idx].color;
		834	char *old = lines[idx].line;
		835	char *new = concat_line (old, str);
		836
		837	free (old);
		838
		839	delete_line (idx);
		840	split_line (idx, new, color);
		841	}
		842
		843	static void
		844	main_loop (void)
		845	{
		846	lines = xmalloc (sizeof (struct linematrix) * listlen);
		847	display = xmalloc (sizeof (struct displaymatrix) * listlen);
		848	int lin;
		849	time_t lastreload;
		850	Region region = XCreateRegion ();
		851	XEvent xev;
		852	struct logfile_entry *lastprinted = NULL;
		853	struct logfile_entry *current;
		854	int need_update = 1;
		855
		856	lastreload = time (NULL);
		857
		858	/* Initialize linematrix */
		859	for (lin = 0; lin < listlen; lin++)
		860	{
		861	lines[lin].line = xstrdup ("~");
		862	lines[lin].len = 1;
		863	display[lin].line = xstrdup("");
		864	display[lin].len = 0;
		865	display[lin].buffer_size = 1;
		866	lines[lin].color = GetColor (def_color);
		867	}
		868
		869	for (;;)
		870	{
		871	/* read logs */
		872	for (current = loglist; current; current = current->next)
		873	{
		874	if (!current->fp)
		875	continue; /* skip missing files */
		876
		877	clearerr (current->fp);
		878
		879	while (lineinput (current))
		880	{
		881	need_update = 1;
		882	/* if we're trying to update old partial lines in
		883	* place, and the last time this file was updated the
		884	* output was partial, and that partial line is not
		885	* too close to the top of the screen, then update
		886	* that partial line */
		887	if (opt_update && current->lastpartial && current->index >= 0)
		888	{
		889	int idx = current->index;
		890	append_line (idx, current->buf);
		891	current->index = idx;
		892	free (current->buf), current->buf = 0;
		893	continue;
		894	}
		895
		896	/* print filename if any, and if last line was from
		897	* different file */
		898	if (!opt_nofilename && lastprinted != current && current->desc[0])
		899	{
		900	char buf[1024]; /* HACK-5 */
		901	snprintf (buf, sizeof (buf), "[%s]", current->desc);
		902	split_line (listlen - 1, buf, current->color);
		903	}
		904
		905	/* if we're dealing with partial lines, and the last
		906	* time we showed the line it wasn't finished ... */
		907	if (!opt_whole && current->lastpartial)
		908	{
		909	/* if this is the same file we showed last then
		910	append to the last line shown */
		911	if (lastprinted == current)
		912	append_line (listlen - 1, current->buf);
		913	else
		914	{
		915	/* but if a different file has been shown in the
		916	* mean time, make a new line, starting with the
		917	* continuation string */
		918	split_line (listlen - 1, continuation, current->color);
		919	append_line (listlen - 1, current->buf);
		920	}
		921	}
		922	else
		923	/* otherwise just make a plain and simple new line */
		924	split_line (listlen - 1, current->buf, current->color);
		925
		926	free (current->buf), current->buf = 0;
		927	current->index = listlen - 1;
		928	lastprinted = current;
		929	}
		930	}
		931
		932	if (need_update)
		933	{
		934	redraw (0);
		935	need_update = 0;
		936	}
		937	else
		938	{
		939	XFlush (disp);
		940
		941	if (!XPending (disp))
		942	{
		943	fd_set fdr;
		944	struct timeval to = interval;
		945
		946	FD_ZERO (&fdr);
		947	FD_SET (ConnectionNumber (disp), &fdr);
		948	select (ConnectionNumber (disp) + 1, &fdr, 0, 0, &to);
		949	}
		950	}
		951
		952	check_open_files ();
		953
		954	if (do_reopen)
		955	reopen ();
		956
		957	/* we ignore possible errors due to window resizing &c */
		958	while (XPending (disp))
		959	{
		960	XNextEvent (disp, &xev);
		961
		962	switch (xev.type)
		963	{
		964	case Expose:
		965	{
		966	XRectangle r;
		967
		968	r.x = xev.xexpose.x;
		969	r.y = xev.xexpose.y;
		970	r.width = xev.xexpose.width;
		971	r.height = xev.xexpose.height;
		972
		973	XUnionRectWithRegion (&r, region, region);
		974	}
		975	break;
		976	default:
		977	#ifdef DEBUGMODE
		978	fprintf (stderr, "PANIC! Unknown event %d\n", xev.type);
		979	#endif
		980	break;
		981	}
		982	}
		983
		984	/* reload if requested */
		985	if (reload && lastreload + reload < time (NULL))
		986	{
		987	if (command && command[0])
		988	system (command);
		989
		990	reopen ();
		991	lastreload = time (NULL);
		992	}
		993
		994	if (!XEmptyRegion (region))
		995	{
		996	XRectangle r;
		997
		998	XSetRegion (disp, WinGC, region);
		999	XClipBox (region, &r);
		1000
		1001	refresh (r.y, r.y + r.height, 0, 1);
		1002
		1003	XDestroyRegion (region);
		1004	region = XCreateRegion ();
		1005	}
		1006	}
		1007	}
		1008
		1009
		1010	int
		1011	main (int argc, char *argv[])
		1012	{
		1013	int i;
		1014	int opt_daemonize = 0;
		1015	int opt_partial = 0, file_count = 0;
		1016	#if HAS_REGEX
		1017	char *transform = NULL;
		1018	#endif
		1019
		1020	setlocale (LC_CTYPE, ""); /* try to initialize the locale. */
		1021
		1022	/* window needs to be initialized before colorlookups can be done */
		1023	/* just a dummy to get the color lookups right */
		1024	geom_mask = NoValue;
		1025	InitWindow ();
		1026
		1027	for (i = 1; i < argc; i++)
		1028	{
		1029	const char *arg = argv[i];
		1030
		1031	if (arg[0] == '-' && arg[1] != '\0' && arg[1] != ',')
		1032	{
		1033	if (arg[1] == '-')
		1034	arg++;
		1035
		1036	if (!strcmp (arg, "-?") ||
		1037	!strcmp (arg, "-help") || !strcmp (arg, "-h"))
		1038	display_help (argv[0]);
		1039	else if (!strcmp (arg, "-V"))
		1040	display_version ();
		1041	else if (!strcmp (arg, "-g") || !strcmp (arg, "-geometry"))
		1042	geom_mask =
		1043	XParseGeometry (argv[++i], &win_x, &win_y, &width, &height);
		1044	else if (!strcmp (arg, "-display"))
		1045	dispname = argv[++i];
		1046	else if (!strcmp (arg, "-cont"))
		1047	continuation = argv[++i];
		1048	else if (!strcmp (arg, "-font") || !strcmp (arg, "-fn"))
		1049	fontname = argv[++i];
		1050	#if HAS_REGEX
		1051	else if (!strcmp (arg, "-t"))
		1052	{
		1053	transform = argv[++i];
		1054	transform_to = argv[++i];
		1055	printf("transform: '%s' to '%s'\n", transform, transform_to);
		1056	}
		1057	#endif
		1058	else if (!strcmp (arg, "-fork") || !strcmp (arg, "-f"))
		1059	opt_daemonize = 1;
		1060	else if (!strcmp (arg, "-reload"))
		1061	{
		1062	reload = atoi (argv[++i]);
		1063	command = argv[++i];
		1064	}
		1065	else if (!strcmp (arg, "-shade"))
		1066	opt_shade = 1;
		1067	else if (!strcmp (arg, "-outline"))
		1068	opt_outline = 1;
		1069	else if (!strcmp (arg, "-noflicker"))
		1070	opt_noflicker = 1;
		1071	else if (!strcmp (arg, "-frame"))
		1072	opt_frame = 1;
		1073	else if (!strcmp (arg, "-no-filename"))
		1074	opt_nofilename = 1;
		1075	else if (!strcmp (arg, "-reverse"))
		1076	opt_reverse = 1;
		1077	else if (!strcmp (arg, "-whole"))
		1078	opt_whole = 1;
		1079	else if (!strcmp (arg, "-partial"))
		1080	opt_partial = 1;
		1081	else if (!strcmp (arg, "-update"))
		1082	opt_update = opt_partial = 1;
		1083	else if (!strcmp (arg, "-wordwrap"))
		1084	opt_wordwrap = 1;
		1085	else if (!strcmp (arg, "-color"))
		1086	def_color = argv[++i];
		1087	else if (!strcmp (arg, "-noinitial"))
		1088	opt_noinitial = 1;
		1089	else if (!strcmp (arg, "-id"))
		1090	root = atoi (argv[++i]);
		1091	else if (!strcmp (arg, "-interval") || !strcmp (arg, "-i"))
		1092	{
		1093	double iv = atof (argv[++i]);
		1094
		1095	interval.tv_sec = (int) iv;
		1096	interval.tv_usec = (iv - interval.tv_sec) * 1e6;
		1097	}
		1098	else
		1099	{
		1100	fprintf (stderr, "Unknown option '%s'.\n"
		1101	"Try --help for more information.\n", arg);
		1102	exit (1);
		1103	}
		1104	}
		1105	else
		1106	{ /* it must be a filename */
		1107	struct logfile_entry *e;
		1108	const char *fname, *desc, *fcolor = def_color;
		1109	char *p;
		1110
		1111	file_count++;
		1112
		1113	/* this is not foolproof yet (',' in filenames are not allowed) */
		1114	fname = desc = arg;
		1115	if ((p = strchr (arg, ',')))
		1116	{
		1117	*p = '\0';
		1118	fcolor = p + 1;
		1119
		1120	if ((p = strchr (fcolor, ',')))
		1121	{
		1122	*p = '\0';
		1123	desc = p + 1;
		1124	}
		1125	}
		1126
		1127	e = xmalloc (sizeof (struct logfile_entry));
		1128	e->partial = 0;
		1129	e->buf = 0;
		1130	e->index = -1;
		1131
		1132	if (arg[0] == '-' && arg[1] == '\0')
		1133	{
		1134	if ((e->fp = fdopen (0, "r")) == NULL)
		1135	perror ("fdopen"), exit (1);
		1136	if (fcntl (0, F_SETFL, O_NONBLOCK) < 0)
		1137	perror ("fcntl"), exit (1);
		1138	e->fname = NULL;
		1139	e->inode = 0;
		1140	e->desc = xstrdup ("stdin");
		1141	}
		1142	else
		1143	{
		1144	int l;
		1145
		1146	e->fname = xstrdup (fname);
402	if (openlog(e) == NULL)	1147	if (openlog (e) == NULL)
403	break;	1148	perror (fname), exit (1);
		1149
		1150	l = strlen (desc);
		1151	/* HACK-6: width is in pixels now */
		1152	if (l > width - 2) /* must account for [ ] */
		1153	l = width - 2;
		1154	e->desc = xmalloc (l + 1);
		1155	memcpy (e->desc, desc, l);
		1156	*(e->desc + l) = '\0';
		1157	}
		1158
		1159	e->color = GetColor (fcolor);
		1160	e->partial = 0;
		1161	e->next = NULL;
		1162
		1163	if (!loglist)
		1164	loglist = e;
		1165	if (loglist_tail)
		1166	loglist_tail->next = e;
		1167	loglist_tail = e;
		1168	}
		1169	}
		1170
		1171	if (!loglist)
		1172	{
		1173	fprintf (stderr, "You did not specify any files to tail\n"
		1174	"use %s --help for help\n", argv[0]);
		1175	exit (1);
		1176	}
		1177
		1178	if (opt_partial && opt_whole)
		1179	{
		1180	fprintf (stderr, "Specify at most one of -partial and -whole\n");
		1181	exit (1);
		1182	}
		1183
		1184	/* HACK-7: do we want to allow both -shade and -outline? */
		1185	if (opt_shade && opt_outline)
		1186	{
		1187	fprintf (stderr, "Specify at most one of -shade and -outline\n");
		1188	exit (1);
		1189	}
		1190
		1191	if (opt_partial)
		1192	/* if we specifically requested to see partial lines then don't insist on whole lines */
		1193	opt_whole = 0;
		1194	else if (file_count > 1)
		1195	/* otherwise, if we're viewing multiple files, default to showing whole lines */
		1196	opt_whole = 1;
		1197
		1198	#if HAS_REGEX
		1199	if (transform)
		1200	{
		1201	int i;
		1202
		1203	printf("compiling regexp '%s'\n", transform);
		1204	transformre = xmalloc (sizeof (regex_t));
		1205	i = regcomp (transformre, transform, REG_EXTENDED);
		1206	if (i != 0)
		1207	{
		1208	char buf[512];
		1209
		1210	regerror (i, transformre, buf, sizeof (buf));
		1211	fprintf (stderr, "Cannot compile regular expression: %s\n", buf);
		1212	}
		1213	else
		1214	{
		1215	printf("compiled '%s' OK to %x\n", transform, (int)transformre);
404	}	1216	}
405
406	if (stats.st_size < e->last_size) { /* file truncated? */
407	fseek(e->fp, 0, SEEK_SET);
408	e->last_size = stats.st_size;
409	}
410	}
411	}
412
413	#define SCROLL_UP(lines, listlen) \
414	{ \
415	int cur_line; \
416	for (cur_line = 0; cur_line < (listlen - 1); cur_line++) { \
417	strcpy(lines[cur_line].line, lines[cur_line + 1].line); \
418	lines[cur_line].color = lines[cur_line + 1].color; \
419	} \
420	}
421
422	void main_loop(void)
423	{
424	struct linematrix *lines = xmalloc(sizeof(struct linematrix) * listlen);
425	int lin, miny, maxy, buflen;
426	char *buf;
427	time_t lastreload;
428	Region region = XCreateRegion();
429	XEvent xev;
430
431	maxy = 0;
432	miny = win_y + h;
433	buflen = width + 2;
434	buf = xmalloc(buflen);
435	lastreload = time(NULL);
436
437	/* Initialize linematrix */
438	for (lin = 0; lin < listlen; lin++) {
439	lines[lin].line = xmalloc(buflen);
440	strcpy(lines[lin].line, "~");
441	lines[lin].color = GetColor(def_color);
442	}
443
444	if (!opt_noinitial)
445	while (lineinput(buf, buflen, loglist->fp) != 0) {
446	SCROLL_UP(lines, listlen);
447	/* print the next line */
448	strcpy(lines[listlen - 1].line, buf);
449	}
450
451	for (;;) {
452	int need_update = 0;
453	struct logfile_entry *current;
454	static struct logfile_entry *lastprinted = NULL;
455
456	/* read logs */
457	for (current = loglist; current; current = current->next) {
458	if (!current->fp)
459	continue; /* skip missing files */
460
461	clearerr(current->fp);
462
463	while (lineinput(buf, buflen, current->fp) != 0) {
464	/* print filename if any, and if last line was from
465	different file */
466	if (!opt_nofilename &&
467	!(lastprinted && lastprinted == current) &&
468	current->desc[0]) {
469	SCROLL_UP(lines, listlen);
470	sprintf(lines[listlen - 1].line, "[%s]", current->desc);
471	lines[listlen - 1].color = current->color;
472	}
473
474	SCROLL_UP(lines, listlen);
475	strcpy(lines[listlen - 1].line, buf);
476	lines[listlen - 1].color = current->color;
477
478	lastprinted = current;
479	need_update = 1;
480	}	1217	}
481	}
482
483	if (need_update)
484	redraw();
485	else {
486	XFlush(disp);
487	if (!XPending(disp)) {
488	fd_set fdr;
489	struct timeval to = interval;
490
491	FD_ZERO(&fdr);
492	FD_SET(ConnectionNumber(disp), &fdr);
493	select(ConnectionNumber(disp) + 1, &fdr, 0, 0, &to);
494	}
495	}
496
497	check_open_files();
498
499	if (do_reopen)
500	reopen();
501
502	/* we ignore possible errors due to window resizing &c */
503	while (XPending(disp)) {
504	XNextEvent(disp, &xev);
505	switch (xev.type) {
506	case Expose:
507	{
508	XRectangle r;
509
510	r.x = xev.xexpose.x;
511	r.y = xev.xexpose.y;
512	r.width = xev.xexpose.width;
513	r.height = xev.xexpose.height;
514	XUnionRectWithRegion(&r, region, region);
515	if (miny > r.y)
516	miny = r.y;
517	if (maxy < r.y + r.height)
518	maxy = r.y + r.height;
519	}
520	break;
521	default:
522	#ifdef DEBUGMODE
523	fprintf(stderr, "PANIC! Unknown event %d\n", xev.type);
524	#endif	1218	#endif
525	break;
526	}
527	}
528		1219
529	/* reload if requested */
530	if (reload && lastreload + reload < time(NULL)) {
531	if (command)
532	system(command);
533
534	reopen();
535	lastreload = time(NULL);
536	}
537
538	if (!XEmptyRegion(region)) {
539	XSetRegion(disp, WinGC, region);
540	refresh(lines, miny, maxy);
541	XDestroyRegion(region);
542	region = XCreateRegion();
543	maxy = 0;
544	miny = win_y + h;
545	}
546	}
547	}
548
549
550	int main(int argc, char *argv[])
551	{
552	int i;
553	int opt_daemonize = 0;
554	#if HAS_REGEX
555	char *transform = NULL;
556	#endif
557
558	/* window needs to be initialized before colorlookups can be done */
559	/* just a dummy to get the color lookups right */
560	geom_mask = NoValue;
561	InitWindow();	1220	InitWindow ();
562		1221
563	for (i = 1; i < argc; i++) {
564	if (argv[i][0] == '-' && argv[i][1] != '\0' && argv[i][1] != ',') {
565	if (!strcmp(argv[i], "--?") ||
566	!strcmp(argv[i], "--help") || !strcmp(argv[i], "-h"))
567	display_help(argv[0]);
568	else if (!strcmp(argv[i], "-V"))
569	display_version();
570	else if (!strcmp(argv[i], "-g") || !strcmp(argv[i], "-geometry"))
571	geom_mask = XParseGeometry(argv[++i],
572	&win_x, &win_y, &width, &listlen);
573	else if (!strcmp(argv[i], "-display"))
574	dispname = argv[++i];
575	else if (!strcmp(argv[i], "-font") || !strcmp(argv[i], "-fn"))
576	fontname = argv[++i];
577	#if HAS_REGEX
578	else if (!strcmp(argv[i], "-t"))
579	transform = argv[++i];
580	#endif
581	else if (!strcmp(argv[i], "-fork") || !strcmp(argv[i], "-f"))
582	opt_daemonize = 1;
583	else if (!strcmp(argv[i], "-reload")) {
584	reload = atoi(argv[++i]);
585	command = argv[++i];
586	}
587	else if (!strcmp(argv[i], "-shade"))
588	opt_shade = 1;
589	else if (!strcmp(argv[i], "-frame"))
590	opt_frame = 1;
591	else if (!strcmp(argv[i], "-no-filename"))
592	opt_nofilename = 1;
593	else if (!strcmp(argv[i], "-reverse"))
594	opt_reverse = 1;
595	else if (!strcmp(argv[i], "-color"))
596	def_color = argv[++i];
597	else if (!strcmp(argv[i], "-noinitial"))
598	opt_noinitial = 1;
599	else if (!strcmp(argv[i], "-interval") || !strcmp(argv[i], "-i")) {
600	double iv = atof(argv[++i]);
601
602	interval.tv_sec = (int) iv;
603	interval.tv_usec = (iv - interval.tv_sec) * 1e6;
604	} else {
605	fprintf(stderr, "Unknown option '%s'.\n"
606	"Try --help for more information.\n", argv[i]);
607	exit(1);
608	}
609	} else { /* it must be a filename */
610	struct logfile_entry *e;
611	const char *fname, *desc, *fcolor = def_color;
612	char *p;
613
614	/* this is not foolproof yet (',' in filenames are not allowed) */
615	fname = desc = argv[i];
616	if ((p = strchr(argv[i], ','))) {
617	*p = '\0';
618	fcolor = p + 1;
619
620	if ((p = strchr(fcolor, ','))) {
621	*p = '\0';
622	desc = p + 1;
623	}
624	}
625
626	e = xmalloc(sizeof(struct logfile_entry));
627	if (argv[i][0] == '-' && argv[i][1] == '\0') {
628	if ((e->fp = fdopen(0, "r")) == NULL)
629	perror("fdopen"), exit(1);
630	if (fcntl(0, F_SETFL, O_NONBLOCK) < 0)
631	perror("fcntl"), exit(1);
632	e->fname = NULL;
633	e->inode = 0;
634	e->desc = xstrdup("stdin");
635	} else {
636	int l;
637
638	e->fname = xstrdup(fname);
639	if (openlog(e) == NULL)
640	perror(fname), exit(1);
641
642	l = strlen(desc);
643	if (l > width - 2) /* must account for [ ] */
644	l = width - 2;
645	e->desc = xmalloc(l + 1);
646	memcpy(e->desc, desc, l);
647	*(e->desc + l) = '\0';
648	}
649
650	e->color = GetColor(fcolor);
651	e->next = NULL;
652
653	if (!loglist)
654	loglist = e;
655	if (loglist_tail)
656	loglist_tail->next = e;
657	loglist_tail = e;
658	}
659	}
660
661	if (!loglist) {
662	fprintf(stderr, "You did not specify any files to tail\n"
663	"use %s --help for help\n", argv[0]);
664	exit(1);
665	}
666
667	#if HAS_REGEX
668	if (transform) {
669	int i;
670
671	transformre = xmalloc(sizeof(transformre));
672	i = regcomp(&transformre, transform, REG_EXTENDED);
673	if (i != 0) {
674	char buf[512];
675
676	regerror(i, &transformre, buf, sizeof(buf));
677	fprintf(stderr, "Cannot compile regular expression: %s\n", buf);
678	}
679	}
680	#endif
681
682	InitWindow();
683
684	install_signal(SIGINT, blank_window);	1222	install_signal (SIGINT, blank_window);
685	install_signal(SIGQUIT, blank_window);	1223	install_signal (SIGQUIT, blank_window);
686	install_signal(SIGTERM, blank_window);	1224	install_signal (SIGTERM, blank_window);
687	install_signal(SIGHUP, force_reopen);	1225	install_signal (SIGHUP, force_reopen);
688	install_signal(SIGUSR1, list_files);	1226	install_signal (SIGUSR1, list_files);
689	install_signal(SIGUSR2, force_refresh);	1227	install_signal (SIGUSR2, force_refresh);
690		1228
691	if (opt_daemonize)	1229	if (opt_daemonize)
692	daemonize();	1230	daemonize ();
693		1231
694	main_loop();	1232	main_loop ();
695		1233
696	exit(1); /* to make gcc -Wall stop complaining */	1234	exit (1); /* to make gcc -Wall stop complaining */
697	}	1235	}
698		1236
		1237	void
699	void install_signal(int sig, void (*handler)(int))	1238	install_signal (int sig, void (*handler) (int))
700	{	1239	{
701	struct sigaction action;	1240	struct sigaction action;
702		1241
703	action.sa_handler = handler;	1242	action.sa_handler = handler;
704	sigemptyset(&action.sa_mask);	1243	sigemptyset (&action.sa_mask);
705	action.sa_flags = SA_RESTART;	1244	action.sa_flags = SA_RESTART;
		1245
706	if (sigaction(sig, &action, NULL) < 0)	1246	if (sigaction (sig, &action, NULL) < 0)
707	fprintf(stderr, "sigaction(%d): %s\n", sig, strerror(errno)), exit(1);	1247	fprintf (stderr, "sigaction(%d): %s\n", sig, strerror (errno)), exit (1);
708	}	1248	}
709		1249
		1250	void *
710	void *xstrdup(const char *string)	1251	xstrdup (const char *string)
711	{	1252	{
712	void *p;	1253	void *p;
713		1254
714	while ((p = strdup(string)) == NULL) {	1255	while ((p = strdup (string)) == NULL)
		1256	{
715	fprintf(stderr, "Memory exausted.");	1257	fprintf (stderr, "Memory exausted.");
716	sleep(10);	1258	sleep (10);
717	}	1259	}
		1260
718	return p;	1261	return p;
719	}	1262	}
720		1263
		1264	void *
721	void *xmalloc(size_t size)	1265	xmalloc (size_t size)
722	{	1266	{
723	void *p;	1267	void *p;
724		1268
725	while ((p = malloc(size)) == NULL) {	1269	while ((p = malloc (size)) == NULL)
		1270	{
726	fprintf(stderr, "Memory exausted.");	1271	fprintf (stderr, "Memory exausted.");
727	sleep(10);	1272	sleep (10);
728	}	1273	}
		1274
729	return p;	1275	return p;
730	}	1276	}
731		1277
		1278	void *
		1279	xrealloc (void *ptr, size_t size)
		1280	{
		1281	void *p;
		1282
		1283	while ((p = realloc (ptr, size)) == NULL)
		1284	{
		1285	fprintf (stderr, "Memory exausted.");
		1286	sleep (10);
		1287	}
		1288
		1289	return p;
		1290	}
		1291
		1292	void
732	void display_help(char *myname)	1293	display_help (char *myname)
733	{	1294	{
734	printf("Usage: %s [options] file1[,color[,desc]] "	1295	printf ("Usage: %s [options] file1[,color[,desc]] "
735	"[file2[,color[,desc]] ...]\n", myname);	1296	"[file2[,color[,desc]] ...]\n", myname);
736	printf(" -g | -geometry geometry -g WIDTHxHEIGHT+X+Y\n"	1297	printf (" -g | -geometry geometry -g WIDTHxHEIGHT+X+Y\n"
737	" -color color use color $color as default\n"	1298	" -color color use color $color as default\n"
738	" -reload sec command reload after $sec and run command\n"	1299	" -reload sec command reload after $sec and run command\n"
739	" by default -- 3 mins\n"	1300	" -id id window id to use instead of the root window\n"
740	" -font FONTSPEC (-fn) font to use\n"	1301	" -font FONTSPEC (-fn) font to use\n"
741	" -f | -fork fork into background\n"	1302	" -f | -fork fork into background\n"
742	" -reverse print new lines at the top\n"	1303	" -reverse print new lines at the top\n"
		1304	" -whole wait for \\n before showing a line\n"
		1305	" -partial show lines even if they don't end with a \\n\n"
		1306	" -update allow updates to old partial lines\n"
		1307	" -cont string to prefix continued partial lines with\n"
		1308	" -wordwrap wrap long lines at spaces to avoid breaking words\n"
		1309	" defaults to \"[+]\"\n"
743	" -shade add shading to font\n"	1310	" -shade add shading to font\n"
744	" -noinitial don't display the last file lines on\n"	1311	" -noinitial don't display the last file lines on\n"
745	" startup\n"	1312	" startup\n"
746	" -i | -interval seconds interval between checks (fractional\n"	1313	" -i | -interval seconds interval between checks (fractional\n"
747	" values o.k.). Default 3\n"	1314	" values o.k.). Default 2.4 seconds\n"
748	" -V display version information and exit\n"	1315	" -V display version information and exit\n"
749	"\n");	1316	"\n");
750	printf("Example:\n%s -g 80x25+100+50 -font fixed /var/log/messages,green "	1317	printf ("Example:\n%s -g 80x25+100+50 -font fixed /var/log/messages,green "
751	"/var/log/secure,red,'ALERT'\n", myname);	1318	"/var/log/secure,red,'ALERT'\n", myname);
752	exit(0);	1319	exit (0);
753	}	1320	}
754		1321
		1322	void
755	void display_version(void) {	1323	display_version (void)
		1324	{
756	printf("root-tail version " VERSION "\n");	1325	printf ("root-tail version " VERSION "\n");
757	exit(0);	1326	exit (0);
758	}	1327	}
759		1328
		1329	int
760	int daemonize(void) {	1330	daemonize (void)
		1331	{
		1332	pid_t pid;
		1333
761	switch (fork()) {	1334	switch (pid = fork ())
		1335	{
762	case -1:	1336	case -1:
763	return -1;	1337	return -1;
764	case 0:	1338	case 0:
765	break;	1339	break;
766	default:	1340	default:
767	_exit(0);	1341	/*printf("%d\n", pid);*/
		1342	exit (0);
768	}	1343	}
769		1344
770	if (setsid() == -1)	1345	if (setsid () == -1)
771	return -1;	1346	return -1;
772		1347
773	return 0;	1348	return 0;
774	}	1349	}
775

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