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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 1.14 by pcg, Sat Mar 27 14:47:27 2004 UTC

…		…
28	#include <fcntl.h>	28	#include <fcntl.h>
29	#include <errno.h>	29	#include <errno.h>
30	#include <sys/time.h>	30	#include <sys/time.h>
31	#include <sys/stat.h>	31	#include <sys/stat.h>
32	#include <sys/types.h>	32	#include <sys/types.h>
		33	#include <locale.h>
		34	#include <ctype.h>
		35	#include <stdarg.h>
33	#if HAS_REGEX	36	#if HAS_REGEX
34	#include <regex.h>	37	#include <regex.h>
35	#endif	38	#endif
36	#include <X11/Xlib.h>	39	#include <X11/Xlib.h>
		40	#include <X11/Xatom.h>
37	#include <X11/Xutil.h>	41	#include <X11/Xutil.h>
38		42
39	/* data structures */	43	/* data structures */
40	struct logfile_entry {	44	struct logfile_entry
41	char *fname; /* name of file */	45	{
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;	46	struct logfile_entry *next;
		47
		48	char *fname; /* name of file */
		49	char *desc; /* alternative description */
		50	char *buf; /* text read but not yet displayed */
		51	FILE *fp; /* FILE struct associated with file */
		52	ino_t inode; /* inode of the file opened */
		53	off_t last_size; /* file size at the last check */
		54	unsigned long color; /* color to be used for printing */
		55	int partial; /* true if the last line isn't complete */
		56	int lastpartial; /* true if the previous output wasn't complete */
		57	int index; /* index into linematrix of a partial line */
48	};	58	};
49		59
50	struct linematrix {	60	struct linematrix
		61	{
51	char *line;	62	char *line;
		63	int len;
52	unsigned long color;	64	unsigned long color;
53	};	65	};
54		66
55
56	/* global variables */	67	/* global variables */
57	unsigned int width = STD_WIDTH, listlen = STD_HEIGHT;	68	struct linematrix *lines;
		69	int width = STD_WIDTH, height = STD_HEIGHT, listlen;
58	int win_x = LOC_X, win_y = LOC_Y;	70	int win_x = LOC_X, win_y = LOC_Y;
59	int w = -1, h = -1, font_width, font_height, font_descent;	71	int font_descent, font_height;
60	int do_reopen;	72	int do_reopen;
61	struct timeval interval = { 2, 400000 }; /* see Knuth */	73	struct timeval interval = { 3, 0 };
		74	XFontSet fontset;
62		75
63	/* command line options */	76	/* command line options */
64	int opt_noinitial, opt_shade, opt_frame, opt_reverse=0, opt_nofilename,	77	int opt_noinitial, opt_shade, opt_frame, opt_reverse, opt_nofilename,
65	geom_mask, reload = 3600;	78	opt_whole, opt_update, geom_mask, reload = 0;
66	const char *command = NULL,	79	const char *command = NULL,
67	*fontname = USE_FONT, *dispname = NULL, *def_color = DEF_COLOR;	80	*fontname = USE_FONT, *dispname = NULL, *def_color = DEF_COLOR,
		81	*continuation = "[+]";
68		82
69	struct logfile_entry *loglist = NULL, *loglist_tail = NULL;	83	struct logfile_entry *loglist = NULL, *loglist_tail = NULL;
70		84
71	Display *disp;	85	Display *disp;
72	Window root;	86	Window root;
73	GC WinGC;	87	GC WinGC;
74		88
75	#if HAS_REGEX	89	#if HAS_REGEX
76	struct re_list {	90	struct re_list
		91	{
77	regex_t from;	92	regex_t from;
78	const char *to;	93	const char *to;
79	struct re_list *next;	94	struct re_list *next;
80	};	95	};
81	struct re_list *re_head, *re_tail;	96	struct re_list *re_head, *re_tail;
82	#endif	97	#endif
83		98
84		99
85	/* prototypes */	100	/* prototypes */
86	void list_files(int);	101	void list_files (int);
87	void force_reopen(int);	102	void force_reopen (int);
88	void force_refresh(int);	103	void force_refresh (int);
89	void blank_window(int);	104	void blank_window (int);
90		105
91	void InitWindow(void);	106	void InitWindow (void);
92	unsigned long GetColor(const char *);	107	unsigned long GetColor (const char *);
93	void redraw(void);	108	void redraw (void);
94	void refresh(struct linematrix *, int, int);	109	void refresh (int, int);
95		110
96	void transform_line(char *s);	111	void transform_line (char *s);
97	int lineinput(char *, int, FILE *);	112	int lineinput (struct logfile_entry *);
98	void reopen(void);	113	void reopen (void);
99	void check_open_files(void);	114	void check_open_files (void);
100	FILE *openlog(struct logfile_entry *);	115	FILE *openlog (struct logfile_entry *);
101	void main_loop(void);	116	static void main_loop (void);
102		117
103	void display_version(void);	118	void display_version (void);
104	void display_help(char *);	119	void display_help (char *);
105	void install_signal(int, void (*)(int));	120	void install_signal (int, void (*)(int));
106	void *xstrdup(const char *);	121	void *xstrdup (const char *);
107	void *xmalloc(size_t);	122	void *xmalloc (size_t);
108	int daemonize(void);	123	int daemonize (void);
109		124
110	/* signal handlers */	125	/* signal handlers */
		126	void
111	void list_files(int dummy)	127	list_files (int dummy)
112	{	128	{
113	struct logfile_entry *e;	129	struct logfile_entry *e;
114		130
115	fprintf(stderr, "Files opened:\n");	131	fprintf (stderr, "Files opened:\n");
116	for (e = loglist; e; e = e->next)	132	for (e = loglist; e; e = e->next)
117	fprintf(stderr, "\t%s (%s)\n", e->fname, e->desc);	133	fprintf (stderr, "\t%s (%s)\n", e->fname, e->desc);
118	}	134	}
119		135
		136	void
120	void force_reopen(int dummy)	137	force_reopen (int dummy)
121	{	138	{
122	do_reopen = 1;	139	do_reopen = 1;
123	}	140	}
124		141
		142	void
125	void force_refresh(int dummy)	143	force_refresh (int dummy)
126	{	144	{
127	XClearWindow(disp, root);
128	redraw();	145	redraw ();
129	}	146	}
130		147
		148	void
131	void blank_window(int dummy)	149	blank_window (int dummy)
132	{	150	{
133	XClearWindow(disp, root);	151	XClearArea (disp, root, win_x, win_y, width, height, False);
134	XFlush(disp);	152	XFlush (disp);
135	exit(0);	153	exit (0);
136	}	154	}
137		155
138	/* X related functions */	156	/* X related functions */
		157	unsigned long
139	unsigned long GetColor(const char *ColorName)	158	GetColor (const char *ColorName)
140	{	159	{
141	XColor Color;	160	XColor Color;
142	XWindowAttributes Attributes;	161	XWindowAttributes Attributes;
143		162
144	XGetWindowAttributes(disp, root, &Attributes);	163	XGetWindowAttributes (disp, root, &Attributes);
145	Color.pixel = 0;	164	Color.pixel = 0;
		165
146	if (!XParseColor(disp, Attributes.colormap, ColorName, &Color))	166	if (!XParseColor (disp, Attributes.colormap, ColorName, &Color))
147	fprintf(stderr, "can't parse %s\n", ColorName);	167	fprintf (stderr, "can't parse %s\n", ColorName);
148	else if (!XAllocColor(disp, Attributes.colormap, &Color))	168	else if (!XAllocColor (disp, Attributes.colormap, &Color))
149	fprintf(stderr, "can't allocate %s\n", ColorName);	169	fprintf (stderr, "can't allocate %s\n", ColorName);
		170
150	return Color.pixel;	171	return Color.pixel;
151	}	172	}
152		173
153	void InitWindow(void)	174	static Window
		175	root_window (Display * display, int screen_number)
154	{	176	{
155	XGCValues gcv;	177	Atom SWM_VROOT = XInternAtom (display, "__SWM_VROOT", False);
156	Font font;	178	Window real_root_window = RootWindow (display, screen_number);
157	unsigned long gcm;
158	XFontStruct *info;
159	int screen, ScreenWidth, ScreenHeight;
160		179
161	if (!(disp = XOpenDisplay(dispname))) {	180	if (root) /* root window set via option */
162	fprintf(stderr, "Can't open display %s.\n", dispname);	181	return root;
163	exit(1);	182
		183	if (SWM_VROOT != None)
164	}	184	{
165	screen = DefaultScreen(disp);	185	Window unused, *windows;
166	ScreenHeight = DisplayHeight(disp, screen);	186	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		187
175	font = XLoadFont(disp, fontname);	188	if (XQueryTree (display, real_root_window, &unused, &unused, &windows,
176	XSetFont(disp, WinGC, font);	189	&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	190	{
204	out[j++] = ' ';	191	int i;
205	while (j % 8);	192
		193	for (i = 0; i < count; i++)
		194	{
		195	Atom type;
		196	int format;
		197	unsigned long nitems, bytes_after_return;
		198	unsigned char *virtual_root_window;
		199
		200	if (XGetWindowProperty (display, windows[i], SWM_VROOT,
		201	0, 1, False, XA_WINDOW, &type, &format,
		202	&nitems, &bytes_after_return,
		203	&virtual_root_window) == Success)
		204	{
		205	if (type != None)
		206	{
		207	if (type == XA_WINDOW)
		208	{
		209	XFree (windows);
		210	return (Window) virtual_root_window;
		211	}
		212	else
		213	fprintf (stderr,
		214	"__SWM_VROOT property type mismatch");
		215	}
		216	}
		217	else
		218	fprintf (stderr,
		219	"failed to get __SWM_VROOT property on window 0x%lx",
		220	windows[i]);
		221	}
		222
		223	if (count)
		224	XFree (windows);
		225	}
206	else	226	else
207	out[j++] = s[i];	227	fprintf (stderr, "Can't query tree on root window 0x%lx",
		228	real_root_window);
		229	}
		230	else
		231	/* This shouldn't happen. The Xlib documentation is wrong BTW. */
		232	fprintf (stderr, "Can't intern atom __SWM_VROOT");
		233
		234	return real_root_window;
		235	}
		236
		237	void
		238	InitWindow (void)
		239	{
		240	XGCValues gcv;
		241	unsigned long gcm;
		242	int screen, ScreenWidth, ScreenHeight;
		243
		244	if (!(disp = XOpenDisplay (dispname)))
		245	{
		246	fprintf (stderr, "Can't open display %s.\n", dispname);
		247	exit (1);
		248	}
		249
		250	screen = DefaultScreen (disp);
		251	ScreenHeight = DisplayHeight (disp, screen);
		252	ScreenWidth = DisplayWidth (disp, screen);
		253
		254	root = root_window (disp, screen);
		255
		256	gcm = GCBackground;
		257	gcv.graphics_exposures = True;
		258	WinGC = XCreateGC (disp, root, gcm, &gcv);
		259	XMapWindow (disp, root);
		260	XSetForeground (disp, WinGC, GetColor (DEF_COLOR));
		261
		262	{
		263	char **missing_charset_list;
		264	int missing_charset_count;
		265	char *def_string;
		266
		267	fontset = XCreateFontSet (disp, fontname,
		268	&missing_charset_list, &missing_charset_count,
		269	&def_string);
		270
		271	if (missing_charset_count)
		272	{
		273	fprintf (stderr,
		274	"Missing charsets in String to FontSet conversion (%s)\n",
		275	missing_charset_list[0]);
		276	XFreeStringList (missing_charset_list);
208	}	277	}
209		278	}
210	out[j] = '\0';	279
211	return out;	280	if (!fontset)
		281	{
		282	fprintf (stderr, "unable to create fontset, exiting.\n");
		283	exit (1);
		284	}
		285
		286	{
		287	XFontSetExtents *xfe = XExtentsOfFontSet (fontset);
		288
		289	font_height = xfe->max_logical_extent.height;
		290	font_descent = xfe->max_logical_extent.y;
		291	}
		292
		293	if (geom_mask & XNegative)
		294	win_x = win_x + ScreenWidth - width;
		295	if (geom_mask & YNegative)
		296	win_y = win_y + ScreenHeight - height;
		297
		298	listlen = height / font_height;
		299
		300	if (!listlen)
		301	{
		302	fprintf (stderr, "height too small for a single line, setting to %d\n",
		303	font_height);
		304	listlen = 1;
		305	}
		306
		307	height = listlen * font_height;
		308
		309	XSelectInput (disp, root, ExposureMask | FocusChangeMask);
212	}	310	}
213		311
214	/*	312	/*
215	* redraw does a complete redraw, rather than an update (i.e. the area	313	* redraw does a complete redraw, rather than an update (i.e. the area
216	* gets cleared first)	314	* gets cleared first)
217	* the rest is handled by regular refresh()'es	315	* the rest is handled by regular refresh()'es
218	*/	316	*/
		317	void
219	void redraw(void)	318	redraw (void)
220	{	319	{
221	XClearArea(disp, root, win_x, win_y, w, h + font_descent + 2, True);	320	XClearArea (disp, root, win_x, win_y, width, height, False);
		321	refresh (0, 32768);
222	}	322	}
223		323
224	/* Just redraw everything without clearing (i.e. after an EXPOSE event) */	324	/* Just redraw everything without clearing (i.e. after an EXPOSE event) */
225	void refresh(struct linematrix *lines, int miny, int maxy)	325	void
		326	refresh (int miny, int maxy)
226	{	327	{
227	int lin;	328	int lin;
228	int offset = (listlen + 1) * font_height;	329	int offset = (listlen + 1) * font_height;
229	unsigned long black_color = GetColor("black");	330	unsigned long black_color = GetColor ("black");
230		331
231	miny -= win_y + font_height;	332	miny -= win_y + font_height;
232	maxy -= win_y - font_height;	333	maxy -= win_y - font_height;
233		334
		335
234	for (lin = listlen; lin--;)	336	for (lin = listlen; lin--;)
		337	{
		338	struct linematrix *line = lines + (opt_reverse ? listlen - lin - 1 : lin);
		339
		340	offset -= font_height;
		341
		342	if (offset < miny || offset > maxy)
		343	continue;
		344
		345	if (opt_shade)
235	{	346	{
236	char *temp;	347	XSetForeground (disp, WinGC, black_color);
		348	XmbDrawString (disp, root, fontset, WinGC, win_x + 2,
		349	win_y + offset + 2, line->line, line->len);
		350	}
		351
		352	XSetForeground (disp, WinGC, line->color);
		353	XmbDrawString (disp, root, fontset, WinGC, win_x, win_y + offset,
		354	line->line, line->len);
		355	}
		356
		357	if (opt_frame)
		358	XDrawRectangle (disp, root, WinGC, win_x - 2, win_y - 2, width + 4, height + 4);
		359	}
		360
		361	#if HAS_REGEX
		362	void
		363	transform_line (char *s)
		364	{
		365	#ifdef I_AM_Md
		366	int i;
		367	if (1)
		368	{
		369	for (i = 16; s[i]; i++)
		370	s[i] = s[i + 11];
		371	}
		372	s[i + 1] = '\0';
		373	#endif
		374
		375	if (transformre)
		376	{
		377	int i;
		378	regmatch_t matched[16];
		379
		380	i = regexec (&transformre, string, 16, matched, 0);
		381	if (i == 0)
		382	{ /* matched */
		383	}
		384	}
		385	}
		386	#endif
		387
		388	char *
		389	concat_line (const char *p1, const char *p2)
		390	{
		391	int l1 = p1 ? strlen (p1) : 0;
		392	int l2 = strlen (p2);
		393	char *r = xmalloc (l1 + l2 + 1);
		394
		395	memcpy (r, p1, l1);
		396	memcpy (r + l1, p2, l2);
		397	r[l1 + l2] = 0;
		398
		399	return r;
		400	}
		401
		402	/*
		403	* This routine should read a single line, no matter how long.
		404	*/
		405	int
		406	lineinput (struct logfile_entry *logfile)
		407	{
		408	char buff[1024], *p = buff;
		409	int ch;
		410	int ofs = logfile->buf ? strlen (logfile->buf) : 0;
		411
		412	do
		413	{
		414	ch = fgetc (logfile->fp);
		415
		416	if (ch == '\r')
		417	continue;
		418	else if (ch == EOF || ch == '\n')
		419	break;
		420	else if (ch == '\t')
		421	{
		422	do
		423	{
		424	*p++ = ' ';
		425	ofs++;
		426	}
		427	while (ofs & 7);
		428	}
		429	else
		430	{
		431	*p++ = ch;
		432	ofs++;
		433	}
		434	}
		435	while (p < buff + (sizeof buff) - 8 - 1);
		436
		437	if (p == buff)
		438	return 0;
		439
		440	*p = 0;
		441
		442	p = concat_line (logfile->buf, buff);
		443	free (logfile->buf); logfile->buf = p;
		444
		445	logfile->lastpartial = logfile->partial;
		446	logfile->partial = ch == EOF;
237		447
238	offset -= font_height;	448	if (logfile->partial && opt_whole)
239		449	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		450
272	#if HAS_REGEX	451	#if HAS_REGEX
273	void transform_line(char *s)	452	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	453	#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;	454	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	}	455	}
326		456
327	/* input: reads file->fname	457	/* input: reads file->fname
328	* output: fills file->fp, file->inode	458	* output: fills file->fp, file->inode
329	* returns file->fp	459	* returns file->fp
330	* in case of error, file->fp is NULL	460	* in case of error, file->fp is NULL
331	*/	461	*/
		462	FILE *
332	FILE *openlog(struct logfile_entry *file)	463	openlog (struct logfile_entry * file)
333	{	464	{
334	struct stat stats;	465	struct stat stats;
335		466
336	if ((file->fp = fopen(file->fname, "r")) == NULL) {	467	if ((file->fp = fopen (file->fname, "r")) == NULL)
		468	{
337	file->fp = NULL;	469	file->fp = NULL;
338	return NULL;	470	return NULL;
339	}	471	}
340		472
341	fstat(fileno(file->fp), &stats);	473	fstat (fileno (file->fp), &stats);
342	if (S_ISFIFO(stats.st_mode)) {	474	if (S_ISFIFO (stats.st_mode))
		475	{
343	if (fcntl(fileno(file->fp), F_SETFL, O_NONBLOCK) < 0)	476	if (fcntl (fileno (file->fp), F_SETFL, O_NONBLOCK) < 0)
344	perror("fcntl"), exit(1);	477	perror ("fcntl"), exit (1);
345	file->inode = 0;	478	file->inode = 0;
		479	}
346	} else	480	else
347	file->inode = stats.st_ino;	481	file->inode = stats.st_ino;
348		482
349	if (opt_noinitial)	483	if (opt_noinitial)
350	fseek (file->fp, 0, SEEK_END);	484	fseek (file->fp, 0, SEEK_END);
351	else if (stats.st_size > (listlen + 1) * width)	485	else if (stats.st_size > (listlen + 1) * width)
		486	fseek (file->fp, -((listlen + 2) * width), SEEK_END);
		487
		488	file->last_size = stats.st_size;
		489	return file->fp;
		490	}
		491
		492	void
		493	reopen (void)
		494	{
		495	struct logfile_entry *e;
		496
		497	for (e = loglist; e; e = e->next)
		498	{
		499	if (!e->inode)
		500	continue; /* skip stdin */
		501
		502	if (e->fp)
		503	fclose (e->fp);
		504	/* if fp is NULL we will try again later */
		505	openlog (e);
		506	}
		507
		508	do_reopen = 0;
		509	}
		510
		511	void
		512	check_open_files (void)
		513	{
		514	struct logfile_entry *e;
		515	struct stat stats;
		516
		517	for (e = loglist; e; e = e->next)
		518	{
		519	if (!e->inode)
		520	continue; /* skip stdin */
		521
		522	if (stat (e->fname, &stats) < 0)
		523	{ /* file missing? */
		524	sleep (1);
		525	if (e->fp)
		526	fclose (e->fp);
		527	if (openlog (e) == NULL)
		528	break;
		529	}
		530
		531	if (stats.st_ino != e->inode)
		532	{ /* file renamed? */
		533	if (e->fp)
		534	fclose (e->fp);
		535	if (openlog (e) == NULL)
		536	break;
		537	}
		538
		539	if (stats.st_size < e->last_size)
		540	{ /* file truncated? */
		541	fseek (e->fp, 0, SEEK_SET);
		542	e->last_size = stats.st_size;
		543	}
		544	}
		545	}
		546
		547	/*
		548	* insert a single physical line (that must be short enough to fit)
		549	* at position "idx" by pushing up lines above it. the caller
		550	* MUST then fill in lines[idx] with valid data.
		551	*/
		552	static void
		553	insert_line (int idx)
		554	{
		555	int cur_line;
		556	struct logfile_entry *current;
		557
		558	free (lines[0].line);
		559
		560	for (cur_line = 0; cur_line < idx; cur_line++)
		561	lines[cur_line] = lines[cur_line + 1];
		562
		563	for (current = loglist; current; current = current->next)
		564	if (current->partial && current->index && current->index <= idx)
		565	current->index--;
		566	}
		567
		568	/*
		569	* remove a single physical line at position "idx" by moving the lines above it
		570	* down and inserting a "~" line at the top.
		571	*/
		572	static void
		573	delete_line (int idx)
		574	{
		575	int cur_line;
		576	struct logfile_entry *current;
		577
		578	for (cur_line = idx; cur_line > 0; cur_line--)
		579	lines[cur_line] = lines[cur_line - 1];
		580
		581	lines[0].line = strdup ("~");
		582
		583	for (current = loglist; current; current = current->next)
		584	if (current->partial && current->index && current->index <= idx)
		585	current->index++;
		586	}
		587
		588	/*
		589	* takes a logical log file line and split it into multiple physical
		590	* screen lines by splitting it whenever a part becomes too long.
		591	* lal lines will be inserted at position "idx".
		592	*/
		593	static void
		594	split_line (int idx, const char *str, unsigned long color)
		595	{
		596	int l = strlen (str);
		597	const char *p = str;
		598
		599	do
		600	{
		601	const char *beg = p;
		602	int w = 0;
		603
		604	while (*p)
		605	{
		606	int len = mblen (p, l);
		607	if (len <= 0)
		608	len = 1; /* ignore (don't skip) ilegal character sequences */
		609
		610	int cw = XmbTextEscapement (fontset, p, len);
		611	if (cw + w >= width)
		612	break;
		613
		614	w += cw;
		615	p += len;
		616	l -= len;
		617	}
		618
352	{	619	{
353	char dummy[255];	620	char *s = xmalloc (p - beg + 1);
354		621	memcpy (s, beg, p - beg);
355	fseek(file->fp, -((listlen + 2) * width), SEEK_END);	622	s[p - beg] = 0;
356	/* the pointer might point halfway some line. Let's	623	insert_line (idx);
357	be nice and skip this damaged line */	624	lines[idx].line = s;
358	lineinput(dummy, sizeof(dummy), file->fp);	625	lines[idx].len = p - beg;
		626	lines[idx].color = color;
359	}	627	}
360
361	file->last_size = stats.st_size;
362	return file->fp;
363	}
364
365	void reopen(void)
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	}	628	}
378		629	while (l);
379	do_reopen = 0;
380	}	630	}
381		631
382	void check_open_files(void)	632	/*
		633	* append something to an existing physical line. this is done
		634	* by deleting the file on-screen, concatenating the new data to it
		635	* and splitting it again.
		636	*/
		637	static void
		638	append_line (int idx, const char *str)
383	{	639	{
384	struct logfile_entry *e;	640	unsigned long color = lines[idx].color;
385	struct stat stats;	641	char *old = lines[idx].line;
		642	char *new = concat_line (old, str);
386		643
387	for (e = loglist; e; e = e->next) {	644	free (old);
388	if (!e->inode)	645	free (str);
389	continue; /* skip stdin */
390		646
391	if (stat(e->fname, &stats) < 0) { /* file missing? */	647	delete_line (idx);
392	sleep(1);	648	split_line (idx, new, color);
393	if (e->fp)
394	fclose(e->fp);
395	if (openlog(e) == NULL)
396	break;
397	}
398
399	if (stats.st_ino != e->inode) { /* file renamed? */
400	if (e->fp)
401	fclose(e->fp);
402	if (openlog(e) == NULL)
403	break;
404	}
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	}	649	}
412		650
413	#define SCROLL_UP(lines, listlen) \	651	static void
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)	652	main_loop (void)
423	{	653	{
424	struct linematrix *lines = xmalloc(sizeof(struct linematrix) * listlen);	654	lines = xmalloc (sizeof (struct linematrix) * listlen);
425	int lin, miny, maxy, buflen;	655	int lin, miny, maxy;
426	char *buf;
427	time_t lastreload;	656	time_t lastreload;
428	Region region = XCreateRegion();	657	Region region = XCreateRegion ();
429	XEvent xev;	658	XEvent xev;
		659	struct logfile_entry *lastprinted = NULL;
		660	struct logfile_entry *current;
430		661
431	maxy = 0;	662	maxy = 0;
432	miny = win_y + h;	663	miny = win_y + height;
433	buflen = width + 2;
434	buf = xmalloc(buflen);
435	lastreload = time(NULL);	664	lastreload = time (NULL);
436		665
437	/* Initialize linematrix */	666	/* Initialize linematrix */
438	for (lin = 0; lin < listlen; lin++) {	667	for (lin = 0; lin < listlen; lin++)
439	lines[lin].line = xmalloc(buflen);	668	{
440	strcpy(lines[lin].line, "~");	669	lines[lin].line = strdup ("~");
		670	lines[lin].len = 1;
441	lines[lin].color = GetColor(def_color);	671	lines[lin].color = GetColor (def_color);
442	}	672	}
443		673
444	if (!opt_noinitial)	674	/* show the display full of empty lines ("~") in case the first
445	while (lineinput(buf, buflen, loglist->fp) != 0) {	675	* time around the loop doesn't produce any output, as it won't if
446	SCROLL_UP(lines, listlen);	676	* either (a) -noinitial is set or (b) all the files are currently
447	/* print the next line */	677	* empty */
448	strcpy(lines[listlen - 1].line, buf);	678	redraw ();
449	}
450		679
451	for (;;) {	680	for (;;)
		681	{
452	int need_update = 0;	682	int need_update = 0;
453	struct logfile_entry *current;
454	static struct logfile_entry *lastprinted = NULL;
455		683
456	/* read logs */	684	/* read logs */
457	for (current = loglist; current; current = current->next) {	685	for (current = loglist; current; current = current->next)
		686	{
458	if (!current->fp)	687	if (!current->fp)
459	continue; /* skip missing files */	688	continue; /* skip missing files */
460		689
461	clearerr(current->fp);	690	clearerr (current->fp);
462		691
463	while (lineinput(buf, buflen, current->fp) != 0) {	692	while (lineinput (current))
		693	{
		694	need_update = 1;
		695	/* if we're trying to update old partial lines in
		696	* place, and the last time this file was updated the
		697	* output was partial, and that partial line is not
		698	* too close to the top of the screen, then update
		699	* that partial line */
		700	if (opt_update && current->lastpartial && current->index > 0)
		701	{
		702	append_line (current->index, current->buf);
		703	free (current->buf), current->buf = 0;
		704	continue;
		705	}
		706
464	/* print filename if any, and if last line was from	707	/* print filename if any, and if last line was from
465	different file */	708	* different file */
466	if (!opt_nofilename &&	709	if (!opt_nofilename && lastprinted != current && current->desc[0])
467	!(lastprinted && lastprinted == current) &&	710	{
468	current->desc[0]) {	711	char buf[1024]; /* HACK */
469	SCROLL_UP(lines, listlen);	712	snprintf (buf, sizeof (buf), "[%s]", current->desc);
470	sprintf(lines[listlen - 1].line, "[%s]", current->desc);	713	split_line (listlen - 1, buf, current->color);
471	lines[listlen - 1].color = current->color;	714	}
472	}
473		715
474	SCROLL_UP(lines, listlen);	716	/* if this is the same file we showed last, and the
475	strcpy(lines[listlen - 1].line, buf);	717	* last time we showed it, it wasn't finished, then
476	lines[listlen - 1].color = current->color;	718	* append to the last line shown */
		719	if (lastprinted == current && current->lastpartial)
		720	{
		721	append_line (listlen - 1, current->buf);
		722	free (current->buf), current->buf = 0;
		723	continue;
		724	}
		725	else
		726	{
		727	split_line (listlen - 1, current->buf, current->color);
		728	free (current->buf), current->buf = 0;
		729	}
477		730
478	lastprinted = current;	731	current->index = listlen - 1;
479	need_update = 1;	732	lastprinted = current;
480	}	733	}
481	}	734	}
482		735
483	if (need_update)	736	if (need_update)
484	redraw();	737	redraw ();
485	else {	738	else
		739	{
486	XFlush(disp);	740	XFlush (disp);
		741
487	if (!XPending(disp)) {	742	if (!XPending (disp))
488	fd_set fdr;	743	{
		744	fd_set fdr;
489	struct timeval to = interval;	745	struct timeval to = interval;
490		746
491	FD_ZERO(&fdr);	747	FD_ZERO (&fdr);
492	FD_SET(ConnectionNumber(disp), &fdr);	748	FD_SET (ConnectionNumber (disp), &fdr);
493	select(ConnectionNumber(disp) + 1, &fdr, 0, 0, &to);	749	select (ConnectionNumber (disp) + 1, &fdr, 0, 0, &to);
494	}	750	}
495	}	751	}
496		752
497	check_open_files();	753	check_open_files ();
498		754
499	if (do_reopen)	755	if (do_reopen)
500	reopen();	756	reopen ();
501		757
502	/* we ignore possible errors due to window resizing &c */	758	/* we ignore possible errors due to window resizing &c */
503	while (XPending(disp)) {	759	while (XPending (disp))
		760	{
504	XNextEvent(disp, &xev);	761	XNextEvent (disp, &xev);
		762
505	switch (xev.type) {	763	switch (xev.type)
		764	{
506	case Expose:	765	case Expose:
507	{	766	{
508	XRectangle r;	767	XRectangle r;
509		768
510	r.x = xev.xexpose.x;	769	r.x = xev.xexpose.x;
511	r.y = xev.xexpose.y;	770	r.y = xev.xexpose.y;
512	r.width = xev.xexpose.width;	771	r.width = xev.xexpose.width;
513	r.height = xev.xexpose.height;	772	r.height = xev.xexpose.height;
514	XUnionRectWithRegion(&r, region, region);	773	XUnionRectWithRegion (&r, region, region);
515	if (miny > r.y)	774	if (miny > r.y)
516	miny = r.y;	775	miny = r.y;
517	if (maxy < r.y + r.height)	776	if (maxy < r.y + r.height)
518	maxy = r.y + r.height;	777	maxy = r.y + r.height;
519	}	778	}
520	break;	779	break;
521	default:	780	default:
522	#ifdef DEBUGMODE	781	#ifdef DEBUGMODE
523	fprintf(stderr, "PANIC! Unknown event %d\n", xev.type);	782	fprintf (stderr, "PANIC! Unknown event %d\n", xev.type);
524	#endif	783	#endif
525	break;	784	break;
		785	}
		786	}
		787
		788	/* reload if requested */
		789	if (reload && lastreload + reload < time (NULL))
		790	{
		791	if (command && command[0])
		792	system (command);
		793
		794	reopen ();
		795	lastreload = time (NULL);
		796	}
		797
		798	if (!XEmptyRegion (region))
		799	{
		800	XSetRegion (disp, WinGC, region);
		801
		802	refresh (miny, maxy);
		803	XDestroyRegion (region);
		804	region = XCreateRegion ();
		805	maxy = 0;
		806	miny = win_y + height;
		807	}
526	}	808	}
527	}
528
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	}	809	}
548		810
549		811
		812	int
550	int main(int argc, char *argv[])	813	main (int argc, char *argv[])
551	{	814	{
552	int i;	815	int i;
553	int opt_daemonize = 0;	816	int opt_daemonize = 0;
		817	int opt_partial = 0, file_count = 0;
554	#if HAS_REGEX	818	#if HAS_REGEX
555	char *transform = NULL;	819	char *transform = NULL;
556	#endif	820	#endif
557		821
		822	setlocale (LC_CTYPE, ""); /* try to initialize the locale. */
		823
558	/* window needs to be initialized before colorlookups can be done */	824	/* window needs to be initialized before colorlookups can be done */
559	/* just a dummy to get the color lookups right */	825	/* just a dummy to get the color lookups right */
560	geom_mask = NoValue;	826	geom_mask = NoValue;
561	InitWindow();	827	InitWindow ();
562		828
563	for (i = 1; i < argc; i++) {	829	for (i = 1; i < argc; i++)
		830	{
		831	const char *arg = argv[i];
		832
564	if (argv[i][0] == '-' && argv[i][1] != '\0' && argv[i][1] != ',') {	833	if (arg[0] == '-' && arg[1] != '\0' && arg[1] != ',')
		834	{
		835	if (arg[1] == '-')
		836	arg++;
		837
565	if (!strcmp(argv[i], "--?") ||	838	if (!strcmp (arg, "-?") ||
566	!strcmp(argv[i], "--help") || !strcmp(argv[i], "-h"))	839	!strcmp (arg, "-help") || !strcmp (arg, "-h"))
567	display_help(argv[0]);	840	display_help (argv[0]);
568	else if (!strcmp(argv[i], "-V"))	841	else if (!strcmp (arg, "-V"))
569	display_version();	842	display_version ();
570	else if (!strcmp(argv[i], "-g") || !strcmp(argv[i], "-geometry"))	843	else if (!strcmp (arg, "-g") || !strcmp (arg, "-geometry"))
571	geom_mask = XParseGeometry(argv[++i],	844	geom_mask =
572	&win_x, &win_y, &width, &listlen);	845	XParseGeometry (argv[++i], &win_x, &win_y, &width, &height);
573	else if (!strcmp(argv[i], "-display"))	846	else if (!strcmp (arg, "-display"))
574	dispname = argv[++i];	847	dispname = argv[++i];
		848	else if (!strcmp (arg, "-cont"))
		849	continuation = argv[++i];
575	else if (!strcmp(argv[i], "-font") || !strcmp(argv[i], "-fn"))	850	else if (!strcmp (arg, "-font") || !strcmp (arg, "-fn"))
576	fontname = argv[++i];	851	fontname = argv[++i];
577	#if HAS_REGEX	852	#if HAS_REGEX
578	else if (!strcmp(argv[i], "-t"))	853	else if (!strcmp (arg, "-t"))
579	transform = argv[++i];	854	transform = argv[++i];
580	#endif	855	#endif
581	else if (!strcmp(argv[i], "-fork") || !strcmp(argv[i], "-f"))	856	else if (!strcmp (arg, "-fork") || !strcmp (arg, "-f"))
582	opt_daemonize = 1;	857	opt_daemonize = 1;
583	else if (!strcmp(argv[i], "-reload")) {	858	else if (!strcmp (arg, "-reload"))
584	reload = atoi(argv[++i]);	859	{
585	command = argv[++i];	860	reload = atoi (argv[++i]);
586	}	861	command = argv[++i];
		862	}
587	else if (!strcmp(argv[i], "-shade"))	863	else if (!strcmp (arg, "-shade"))
588	opt_shade = 1;	864	opt_shade = 1;
589	else if (!strcmp(argv[i], "-frame"))	865	else if (!strcmp (arg, "-frame"))
590	opt_frame = 1;	866	opt_frame = 1;
591	else if (!strcmp(argv[i], "-no-filename"))	867	else if (!strcmp (arg, "-no-filename"))
592	opt_nofilename = 1;	868	opt_nofilename = 1;
593	else if (!strcmp(argv[i], "-reverse"))	869	else if (!strcmp (arg, "-reverse"))
594	opt_reverse = 1;	870	opt_reverse = 1;
		871	else if (!strcmp (arg, "-whole"))
		872	opt_whole = 1;
		873	else if (!strcmp (arg, "-partial"))
		874	opt_partial = 1;
		875	else if (!strcmp (arg, "-update"))
		876	opt_update = opt_partial = 1;
595	else if (!strcmp(argv[i], "-color"))	877	else if (!strcmp (arg, "-color"))
596	def_color = argv[++i];	878	def_color = argv[++i];
597	else if (!strcmp(argv[i], "-noinitial"))	879	else if (!strcmp (arg, "-noinitial"))
598	opt_noinitial = 1;	880	opt_noinitial = 1;
		881	else if (!strcmp (arg, "-id"))
		882	root = atoi (argv[++i]);
599	else if (!strcmp(argv[i], "-interval") || !strcmp(argv[i], "-i")) {	883	else if (!strcmp (arg, "-interval") || !strcmp (arg, "-i"))
		884	{
600	double iv = atof(argv[++i]);	885	double iv = atof (argv[++i]);
601		886
602	interval.tv_sec = (int) iv;	887	interval.tv_sec = (int) iv;
603	interval.tv_usec = (iv - interval.tv_sec) * 1e6;	888	interval.tv_usec = (iv - interval.tv_sec) * 1e6;
604	} else {	889	}
		890	else
		891	{
605	fprintf(stderr, "Unknown option '%s'.\n"	892	fprintf (stderr, "Unknown option '%s'.\n"
606	"Try --help for more information.\n", argv[i]);	893	"Try --help for more information.\n", arg);
607	exit(1);	894	exit (1);
608	}	895	}
609	} else { /* it must be a filename */	896	}
		897	else
		898	{ /* it must be a filename */
610	struct logfile_entry *e;	899	struct logfile_entry *e;
611	const char *fname, *desc, *fcolor = def_color;	900	const char *fname, *desc, *fcolor = def_color;
612	char *p;	901	char *p;
613		902
		903	file_count++;
		904
614	/* this is not foolproof yet (',' in filenames are not allowed) */	905	/* this is not foolproof yet (',' in filenames are not allowed) */
615	fname = desc = argv[i];	906	fname = desc = arg;
616	if ((p = strchr(argv[i], ','))) {	907	if ((p = strchr (arg, ',')))
617	*p = '\0';	908	{
618	fcolor = p + 1;	909	*p = '\0';
		910	fcolor = p + 1;
619		911
620	if ((p = strchr(fcolor, ','))) {	912	if ((p = strchr (fcolor, ',')))
621	*p = '\0';	913	{
622	desc = p + 1;	914	*p = '\0';
623	}	915	desc = p + 1;
624	}	916	}
		917	}
625		918
626	e = xmalloc(sizeof(struct logfile_entry));	919	e = xmalloc (sizeof (struct logfile_entry));
		920	e->partial = 0;
		921	e->buf = 0;
		922
627	if (argv[i][0] == '-' && argv[i][1] == '\0') {	923	if (arg[0] == '-' && arg[1] == '\0')
		924	{
628	if ((e->fp = fdopen(0, "r")) == NULL)	925	if ((e->fp = fdopen (0, "r")) == NULL)
629	perror("fdopen"), exit(1);	926	perror ("fdopen"), exit (1);
630	if (fcntl(0, F_SETFL, O_NONBLOCK) < 0)	927	if (fcntl (0, F_SETFL, O_NONBLOCK) < 0)
631	perror("fcntl"), exit(1);	928	perror ("fcntl"), exit (1);
632	e->fname = NULL;	929	e->fname = NULL;
633	e->inode = 0;	930	e->inode = 0;
634	e->desc = xstrdup("stdin");	931	e->desc = xstrdup ("stdin");
635	} else {	932	}
636	int l;	933	else
		934	{
		935	int l;
637		936
638	e->fname = xstrdup(fname);	937	e->fname = xstrdup (fname);
639	if (openlog(e) == NULL)	938	if (openlog (e) == NULL)
640	perror(fname), exit(1);	939	perror (fname), exit (1);
641		940
642	l = strlen(desc);	941	l = strlen (desc);
643	if (l > width - 2) /* must account for [ ] */	942	if (l > width - 2) /* must account for [ ] */
644	l = width - 2;	943	l = width - 2;
645	e->desc = xmalloc(l + 1);	944	e->desc = xmalloc (l + 1);
646	memcpy(e->desc, desc, l);	945	memcpy (e->desc, desc, l);
647	*(e->desc + l) = '\0';	946	*(e->desc + l) = '\0';
		947	}
		948
		949	e->color = GetColor (fcolor);
		950	e->partial = 0;
		951	e->next = NULL;
		952
		953	if (!loglist)
		954	loglist = e;
		955	if (loglist_tail)
		956	loglist_tail->next = e;
		957	loglist_tail = e;
		958	}
648	}	959	}
649		960
650	e->color = GetColor(fcolor);
651	e->next = NULL;
652
653	if (!loglist)	961	if (!loglist)
654	loglist = e;
655	if (loglist_tail)
656	loglist_tail->next = e;
657	loglist_tail = e;
658	}
659	}	962	{
660
661	if (!loglist) {
662	fprintf(stderr, "You did not specify any files to tail\n"	963	fprintf (stderr, "You did not specify any files to tail\n"
663	"use %s --help for help\n", argv[0]);	964	"use %s --help for help\n", argv[0]);
664	exit(1);	965	exit (1);
		966	}
		967
		968	if (opt_partial && opt_whole)
665	}	969	{
		970	fprintf (stderr, "Specify at most one of -partial and -whole\n");
		971	exit (1);
		972	}
		973
		974	if (opt_partial)
		975	/* if we specifically requested to see partial lines then don't insist on whole lines */
		976	opt_whole = 0;
		977	else if (file_count > 1)
		978	/* otherwise, if we've viewing multiple files, default to showing whole lines */
		979	opt_whole = 1;
666		980
667	#if HAS_REGEX	981	#if HAS_REGEX
668	if (transform) {	982	if (transform)
669	int i;	983	{
		984	int i;
670		985
671	transformre = xmalloc(sizeof(transformre));	986	transformre = xmalloc (sizeof (transformre));
672	i = regcomp(&transformre, transform, REG_EXTENDED);	987	i = regcomp (&transformre, transform, REG_EXTENDED);
673	if (i != 0) {	988	if (i != 0)
		989	{
674	char buf[512];	990	char buf[512];
675		991
676	regerror(i, &transformre, buf, sizeof(buf));	992	regerror (i, &transformre, buf, sizeof (buf));
677	fprintf(stderr, "Cannot compile regular expression: %s\n", buf);	993	fprintf (stderr, "Cannot compile regular expression: %s\n", buf);
678	}	994	}
679	}	995	}
680	#endif	996	#endif
681		997
682	InitWindow();	998	InitWindow ();
683		999
684	install_signal(SIGINT, blank_window);	1000	install_signal (SIGINT, blank_window);
685	install_signal(SIGQUIT, blank_window);	1001	install_signal (SIGQUIT, blank_window);
686	install_signal(SIGTERM, blank_window);	1002	install_signal (SIGTERM, blank_window);
687	install_signal(SIGHUP, force_reopen);	1003	install_signal (SIGHUP, force_reopen);
688	install_signal(SIGUSR1, list_files);	1004	install_signal (SIGUSR1, list_files);
689	install_signal(SIGUSR2, force_refresh);	1005	install_signal (SIGUSR2, force_refresh);
690		1006
691	if (opt_daemonize)	1007	if (opt_daemonize)
692	daemonize();	1008	daemonize ();
693		1009
694	main_loop();	1010	main_loop ();
695		1011
696	exit(1); /* to make gcc -Wall stop complaining */	1012	exit (1); /* to make gcc -Wall stop complaining */
697	}	1013	}
698		1014
		1015	void
699	void install_signal(int sig, void (*handler)(int))	1016	install_signal (int sig, void (*handler) (int))
700	{	1017	{
701	struct sigaction action;	1018	struct sigaction action;
702		1019
703	action.sa_handler = handler;	1020	action.sa_handler = handler;
704	sigemptyset(&action.sa_mask);	1021	sigemptyset (&action.sa_mask);
705	action.sa_flags = SA_RESTART;	1022	action.sa_flags = SA_RESTART;
		1023
706	if (sigaction(sig, &action, NULL) < 0)	1024	if (sigaction (sig, &action, NULL) < 0)
707	fprintf(stderr, "sigaction(%d): %s\n", sig, strerror(errno)), exit(1);	1025	fprintf (stderr, "sigaction(%d): %s\n", sig, strerror (errno)), exit (1);
708	}	1026	}
709		1027
		1028	void *
710	void *xstrdup(const char *string)	1029	xstrdup (const char *string)
711	{	1030	{
712	void *p;	1031	void *p;
713		1032
714	while ((p = strdup(string)) == NULL) {	1033	while ((p = strdup (string)) == NULL)
		1034	{
715	fprintf(stderr, "Memory exausted.");	1035	fprintf (stderr, "Memory exausted.");
716	sleep(10);	1036	sleep (10);
717	}	1037	}
		1038
718	return p;	1039	return p;
719	}	1040	}
720		1041
		1042	void *
721	void *xmalloc(size_t size)	1043	xmalloc (size_t size)
722	{	1044	{
723	void *p;	1045	void *p;
724		1046
725	while ((p = malloc(size)) == NULL) {	1047	while ((p = malloc (size)) == NULL)
		1048	{
726	fprintf(stderr, "Memory exausted.");	1049	fprintf (stderr, "Memory exausted.");
727	sleep(10);	1050	sleep (10);
728	}	1051	}
		1052
729	return p;	1053	return p;
730	}	1054	}
731		1055
		1056	void
732	void display_help(char *myname)	1057	display_help (char *myname)
733	{	1058	{
734	printf("Usage: %s [options] file1[,color[,desc]] "	1059	printf ("Usage: %s [options] file1[,color[,desc]] "
735	"[file2[,color[,desc]] ...]\n", myname);	1060	"[file2[,color[,desc]] ...]\n", myname);
736	printf(" -g | -geometry geometry -g WIDTHxHEIGHT+X+Y\n"	1061	printf (" -g | -geometry geometry -g WIDTHxHEIGHT+X+Y\n"
737	" -color color use color $color as default\n"	1062	" -color color use color $color as default\n"
738	" -reload sec command reload after $sec and run command\n"	1063	" -reload sec command reload after $sec and run command\n"
739	" by default -- 3 mins\n"	1064	" -id id window id to use instead of the root window\n"
740	" -font FONTSPEC (-fn) font to use\n"	1065	" -font FONTSPEC (-fn) font to use\n"
741	" -f | -fork fork into background\n"	1066	" -f | -fork fork into background\n"
742	" -reverse print new lines at the top\n"	1067	" -reverse print new lines at the top\n"
		1068	" -whole wait for \\n before showing a line\n"
		1069	" -partial show lines even if they don't end with a \\n\n"
		1070	" -update allow updates to old partial lines\n"
		1071	" -cont string to prefix continued partial lines with\n"
		1072	" defaults to \"[+]\"\n"
743	" -shade add shading to font\n"	1073	" -shade add shading to font\n"
744	" -noinitial don't display the last file lines on\n"	1074	" -noinitial don't display the last file lines on\n"
745	" startup\n"	1075	" startup\n"
746	" -i | -interval seconds interval between checks (fractional\n"	1076	" -i | -interval seconds interval between checks (fractional\n"
747	" values o.k.). Default 3\n"	1077	" values o.k.). Default 3 seconds\n"
748	" -V display version information and exit\n"	1078	" -V display version information and exit\n"
749	"\n");	1079	"\n");
750	printf("Example:\n%s -g 80x25+100+50 -font fixed /var/log/messages,green "	1080	printf ("Example:\n%s -g 80x25+100+50 -font fixed /var/log/messages,green "
751	"/var/log/secure,red,'ALERT'\n", myname);	1081	"/var/log/secure,red,'ALERT'\n", myname);
752	exit(0);	1082	exit (0);
753	}	1083	}
754		1084
		1085	void
755	void display_version(void) {	1086	display_version (void)
		1087	{
756	printf("root-tail version " VERSION "\n");	1088	printf ("root-tail version " VERSION "\n");
757	exit(0);	1089	exit (0);
758	}	1090	}
759		1091
		1092	int
760	int daemonize(void) {	1093	daemonize (void)
		1094	{
761	switch (fork()) {	1095	switch (fork ())
		1096	{
762	case -1:	1097	case -1:
763	return -1;	1098	return -1;
764	case 0:	1099	case 0:
765	break;	1100	break;
766	default:	1101	default:
767	_exit(0);	1102	_exit (0);
768	}	1103	}
769		1104
770	if (setsid() == -1)	1105	if (setsid () == -1)
771	return -1;	1106	return -1;
772		1107
773	return 0;	1108	return 0;
774	}	1109	}
775

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