Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/mandoc/tag.c	Lines:	3	96	3.1 %
Date:	2017-11-13	Branches:	1	66	1.5 %


/*	$OpenBSD: tag.c,v 1.18 2017/02/09 17:19:07 schwarze Exp $ */
/*
 * Copyright (c) 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/types.h>

#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "mandoc_aux.h"
#include "mandoc_ohash.h"
#include "tag.h"

struct tag_entry {
	size_t	*lines;
	size_t	 maxlines;
	size_t	 nlines;
	int	 prio;
	char	 s[];
};

static	void	 tag_signal(int) __attribute__((__noreturn__));

static struct ohash	 tag_data;
static struct tag_files	 tag_files;


/*
 * Prepare for using a pager.
 * Not all pagers are capable of using a tag file,
 * but for simplicity, create it anyway.
 */
struct tag_files *
tag_init(void)
{
	struct sigaction	 sa;
	int			 ofd;

	ofd = -1;
	tag_files.tfd = -1;
	tag_files.tcpgid = -1;

	/* Clean up when dying from a signal. */

	memset(&sa, 0, sizeof(sa));
	sigfillset(&sa.sa_mask);
	sa.sa_handler = tag_signal;
	sigaction(SIGHUP, &sa, NULL);
	sigaction(SIGINT, &sa, NULL);
	sigaction(SIGTERM, &sa, NULL);

	/*
	 * POSIX requires that a process calling tcsetpgrp(3)
	 * from the background gets a SIGTTOU signal.
	 * In that case, do not stop.
	 */

	sa.sa_handler = SIG_IGN;
	sigaction(SIGTTOU, &sa, NULL);

	/* Save the original standard output for use by the pager. */

	if ((tag_files.ofd = dup(STDOUT_FILENO)) == -1)
		goto fail;

	/* Create both temporary output files. */

	(void)strlcpy(tag_files.ofn, "/tmp/man.XXXXXXXXXX",
	    sizeof(tag_files.ofn));
	(void)strlcpy(tag_files.tfn, "/tmp/man.XXXXXXXXXX",
	    sizeof(tag_files.tfn));
	if ((ofd = mkstemp(tag_files.ofn)) == -1)
		goto fail;
	if ((tag_files.tfd = mkstemp(tag_files.tfn)) == -1)
		goto fail;
	if (dup2(ofd, STDOUT_FILENO) == -1)
		goto fail;
	close(ofd);

	/*
	 * Set up the ohash table to collect output line numbers
	 * where various marked-up terms are documented.
	 */

	mandoc_ohash_init(&tag_data, 4, offsetof(struct tag_entry, s));
	return &tag_files;

fail:
	tag_unlink();
	if (ofd != -1)
		close(ofd);
	if (tag_files.ofd != -1)
		close(tag_files.ofd);
	if (tag_files.tfd != -1)
		close(tag_files.tfd);
	*tag_files.ofn = '\0';
	*tag_files.tfn = '\0';
	tag_files.ofd = -1;
	tag_files.tfd = -1;
	return NULL;
}

/*
 * Set the line number where a term is defined,
 * unless it is already defined at a higher priority.
 */
void
tag_put(const char *s, int prio, size_t line)
{
	struct tag_entry	*entry;
	size_t			 len;
	unsigned int		 slot;

	/* Sanity checks. */

	if (tag_files.tfd <= 0)
		return;
	if (s[0] == '\\' && (s[1] == '&' || s[1] == 'e'))
		s += 2;
	if (*s == '\0' || strchr(s, ' ') != NULL)
		return;

	slot = ohash_qlookup(&tag_data, s);
	entry = ohash_find(&tag_data, slot);

	if (entry == NULL) {

		/* Build a new entry. */

		len = strlen(s) + 1;
		entry = mandoc_malloc(sizeof(*entry) + len);
		memcpy(entry->s, s, len);
		entry->lines = NULL;
		entry->maxlines = entry->nlines = 0;
		ohash_insert(&tag_data, slot, entry);

	} else {

		/* Handle priority 0 entries. */

		if (prio == 0) {
			if (entry->prio == 0)
				entry->prio = -1;
			return;
		}

		/* A better entry is already present, ignore the new one. */

		if (entry->prio > 0 && entry->prio < prio)
			return;

		/* The existing entry is worse, clear it. */

		if (entry->prio < 1 || entry->prio > prio)
			entry->nlines = 0;
	}

	/* Remember the new line. */

	if (entry->maxlines == entry->nlines) {
		entry->maxlines += 4;
		entry->lines = mandoc_reallocarray(entry->lines,
		    entry->maxlines, sizeof(*entry->lines));
	}
	entry->lines[entry->nlines++] = line;
	entry->prio = prio;
}

/*
 * Write out the tags file using the previously collected
 * information and clear the ohash table while going along.
 */
void
tag_write(void)
{
	FILE			*stream;
	struct tag_entry	*entry;
	size_t			 i;
	unsigned int		 slot;

	if (tag_files.tfd <= 0)
		return;
	stream = fdopen(tag_files.tfd, "w");
	entry = ohash_first(&tag_data, &slot);
	while (entry != NULL) {
		if (stream != NULL && entry->prio >= 0)
			for (i = 0; i < entry->nlines; i++)
				fprintf(stream, "%s %s %zu\n",
				    entry->s, tag_files.ofn, entry->lines[i]);
		free(entry->lines);
		free(entry);
		entry = ohash_next(&tag_data, &slot);
	}
	ohash_delete(&tag_data);
	if (stream != NULL)
		fclose(stream);
}

void
tag_unlink(void)
{
	pid_t	 tc_pgid;

	if (tag_files.tcpgid != -1) {
		tc_pgid = tcgetpgrp(tag_files.ofd);
		if (tc_pgid == tag_files.pager_pid ||
		    tc_pgid == getpgid(0) ||
		    getpgid(tc_pgid) == -1)
			(void)tcsetpgrp(tag_files.ofd, tag_files.tcpgid);
	}
	if (*tag_files.ofn != '\0')
		unlink(tag_files.ofn);
	if (*tag_files.tfn != '\0')
		unlink(tag_files.tfn);
}

static void
tag_signal(int signum)
{
	struct sigaction	 sa;

	tag_unlink();
	memset(&sa, 0, sizeof(sa));
	sigemptyset(&sa.sa_mask);
	sa.sa_handler = SIG_DFL;
	sigaction(signum, &sa, NULL);
	kill(getpid(), signum);
	/* NOTREACHED */
	_exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: tag.c,v 1.18 2017/02/09 17:19:07 schwarze Exp $ */
2			/*
3			* Copyright (c) 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
4			*
5			* Permission to use, copy, modify, and distribute this software for any
6			* purpose with or without fee is hereby granted, provided that the above
7			* copyright notice and this permission notice appear in all copies.
8			*
9			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16			*/
17			#include <sys/types.h>
18
19			#include <signal.h>
20			#include <stddef.h>
21			#include <stdint.h>
22			#include <stdio.h>
23			#include <stdlib.h>
24			#include <string.h>
25			#include <unistd.h>
26
27			#include "mandoc_aux.h"
28			#include "mandoc_ohash.h"
29			#include "tag.h"
30
31			struct tag_entry {
32			size_t *lines;
33			size_t maxlines;
34			size_t nlines;
35			int prio;
36			char s[];
37			};
38
39			static void tag_signal(int) __attribute__((__noreturn__));
40
41			static struct ohash tag_data;
42			static struct tag_files tag_files;
43
44
45			/*
46			* Prepare for using a pager.
47			* Not all pagers are capable of using a tag file,
48			* but for simplicity, create it anyway.
49			*/
50			struct tag_files *
51			tag_init(void)
52			{
53			struct sigaction sa;
54			int ofd;
55
56			ofd = -1;
57			tag_files.tfd = -1;
58			tag_files.tcpgid = -1;
59
60			/* Clean up when dying from a signal. */
61
62			memset(&sa, 0, sizeof(sa));
63			sigfillset(&sa.sa_mask);
64			sa.sa_handler = tag_signal;
65			sigaction(SIGHUP, &sa, NULL);
66			sigaction(SIGINT, &sa, NULL);
67			sigaction(SIGTERM, &sa, NULL);
68
69			/*
70			* POSIX requires that a process calling tcsetpgrp(3)
71			* from the background gets a SIGTTOU signal.
72			* In that case, do not stop.
73			*/
74
75			sa.sa_handler = SIG_IGN;
76			sigaction(SIGTTOU, &sa, NULL);
77
78			/* Save the original standard output for use by the pager. */
79
80			if ((tag_files.ofd = dup(STDOUT_FILENO)) == -1)
81			goto fail;
82
83			/* Create both temporary output files. */
84
85			(void)strlcpy(tag_files.ofn, "/tmp/man.XXXXXXXXXX",
86			sizeof(tag_files.ofn));
87			(void)strlcpy(tag_files.tfn, "/tmp/man.XXXXXXXXXX",
88			sizeof(tag_files.tfn));
89			if ((ofd = mkstemp(tag_files.ofn)) == -1)
90			goto fail;
91			if ((tag_files.tfd = mkstemp(tag_files.tfn)) == -1)
92			goto fail;
93			if (dup2(ofd, STDOUT_FILENO) == -1)
94			goto fail;
95			close(ofd);
96
97			/*
98			* Set up the ohash table to collect output line numbers
99			* where various marked-up terms are documented.
100			*/
101
102			mandoc_ohash_init(&tag_data, 4, offsetof(struct tag_entry, s));
103			return &tag_files;
104
105			fail:
106			tag_unlink();
107			if (ofd != -1)
108			close(ofd);
109			if (tag_files.ofd != -1)
110			close(tag_files.ofd);
111			if (tag_files.tfd != -1)
112			close(tag_files.tfd);
113			*tag_files.ofn = '\0';
114			*tag_files.tfn = '\0';
115			tag_files.ofd = -1;
116			tag_files.tfd = -1;
117			return NULL;
118			}
119
120			/*
121			* Set the line number where a term is defined,
122			* unless it is already defined at a higher priority.
123			*/
124			void
125			tag_put(const char *s, int prio, size_t line)
126			{
127			struct tag_entry *entry;
128			size_t len;
129			unsigned int slot;
130
131			/* Sanity checks. */
132
133	✓✗	1650	if (tag_files.tfd <= 0)
134		825	return;
135			if (s[0] == '\\' && (s[1] == '&' \|\| s[1] == 'e'))
136			s += 2;
137			if (*s == '\0' \|\| strchr(s, ' ') != NULL)
138			return;
139
140			slot = ohash_qlookup(&tag_data, s);
141			entry = ohash_find(&tag_data, slot);
142
143			if (entry == NULL) {
144
145			/* Build a new entry. */
146
147			len = strlen(s) + 1;
148			entry = mandoc_malloc(sizeof(*entry) + len);
149			memcpy(entry->s, s, len);
150			entry->lines = NULL;
151			entry->maxlines = entry->nlines = 0;
152			ohash_insert(&tag_data, slot, entry);
153
154			} else {
155
156			/* Handle priority 0 entries. */
157
158			if (prio == 0) {
159			if (entry->prio == 0)
160			entry->prio = -1;
161			return;
162			}
163
164			/* A better entry is already present, ignore the new one. */
165
166			if (entry->prio > 0 && entry->prio < prio)
167			return;
168
169			/* The existing entry is worse, clear it. */
170
171			if (entry->prio < 1 \|\| entry->prio > prio)
172			entry->nlines = 0;
173			}
174
175			/* Remember the new line. */
176
177			if (entry->maxlines == entry->nlines) {
178			entry->maxlines += 4;
179			entry->lines = mandoc_reallocarray(entry->lines,
180			entry->maxlines, sizeof(*entry->lines));
181			}
182			entry->lines[entry->nlines++] = line;
183			entry->prio = prio;
184		825	}
185
186			/*
187			* Write out the tags file using the previously collected
188			* information and clear the ohash table while going along.
189			*/
190			void
191			tag_write(void)
192			{
193			FILE *stream;
194			struct tag_entry *entry;
195			size_t i;
196			unsigned int slot;
197
198			if (tag_files.tfd <= 0)
199			return;
200			stream = fdopen(tag_files.tfd, "w");
201			entry = ohash_first(&tag_data, &slot);
202			while (entry != NULL) {
203			if (stream != NULL && entry->prio >= 0)
204			for (i = 0; i < entry->nlines; i++)
205			fprintf(stream, "%s %s %zu\n",
206			entry->s, tag_files.ofn, entry->lines[i]);
207			free(entry->lines);
208			free(entry);
209			entry = ohash_next(&tag_data, &slot);
210			}
211			ohash_delete(&tag_data);
212			if (stream != NULL)
213			fclose(stream);
214			}
215
216			void
217			tag_unlink(void)
218			{
219			pid_t tc_pgid;
220
221			if (tag_files.tcpgid != -1) {
222			tc_pgid = tcgetpgrp(tag_files.ofd);
223			if (tc_pgid == tag_files.pager_pid \|\|
224			tc_pgid == getpgid(0) \|\|
225			getpgid(tc_pgid) == -1)
226			(void)tcsetpgrp(tag_files.ofd, tag_files.tcpgid);
227			}
228			if (*tag_files.ofn != '\0')
229			unlink(tag_files.ofn);
230			if (*tag_files.tfn != '\0')
231			unlink(tag_files.tfn);
232			}
233
234			static void
235			tag_signal(int signum)
236			{
237			struct sigaction sa;
238
239			tag_unlink();
240			memset(&sa, 0, sizeof(sa));
241			sigemptyset(&sa.sa_mask);
242			sa.sa_handler = SIG_DFL;
243			sigaction(signum, &sa, NULL);
244			kill(getpid(), signum);
245			/* NOTREACHED */
246			_exit(1);
247			}