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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/cvs/buf.c	Lines:	58	83	69.9 %
Date:	2017-11-07	Branches:	19	42	45.2 %


/*	$OpenBSD: buf.c,v 1.84 2016/10/15 22:20:17 millert Exp $	*/
/*
 * Copyright (c) 2003 Jean-Francois Brousseau <jfb@openbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/stat.h>
#include <sys/time.h>

#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "atomicio.h"
#include "cvs.h"
#include "buf.h"

#define BUF_INCR	128

struct buf {
	/* buffer handle, buffer size, and data length */
	u_char	*cb_buf;
	size_t	 cb_size;
	size_t	 cb_len;
};

#define SIZE_LEFT(b)	(b->cb_size - b->cb_len)

static void	buf_grow(BUF *, size_t);

/*
 * Create a new buffer structure and return a pointer to it.  This structure
 * uses dynamically-allocated memory and must be freed with buf_free(), once
 * the buffer is no longer needed.
 */
BUF *
buf_alloc(size_t len)
{
	BUF *b;

	b = xmalloc(sizeof(*b));
	/* Postpone creation of zero-sized buffers */
	if (len > 0)
		b->cb_buf = xcalloc(1, len);
	else
		b->cb_buf = NULL;

	b->cb_size = len;
	b->cb_len = 0;

	return (b);
}

/*
 * Open the file specified by <path> and load all of its contents into a
 * buffer.
 * Returns the loaded buffer.
 */
BUF *
buf_load(const char *path)
{
	int fd;
	BUF *bp;

	if ((fd = open(path, O_RDONLY, 0600)) == -1)
		fatal("buf_load: failed to load '%s' : %s", path,
		    strerror(errno));

	bp = buf_load_fd(fd);
	(void)close(fd);
	return (bp);
}

BUF *
buf_load_fd(int fd)
{
	struct stat st;
	BUF *buf;

	if (fstat(fd, &st) == -1)
		fatal("buf_load_fd: fstat: %s", strerror(errno));

	if (lseek(fd, 0, SEEK_SET) == -1)
		fatal("buf_load_fd: lseek: %s", strerror(errno));

	if ((uintmax_t)st.st_size > SIZE_MAX)
		fatal("buf_load_fd: file size too big");
	buf = buf_alloc(st.st_size);
	if (atomicio(read, fd, buf->cb_buf, buf->cb_size) != buf->cb_size)
		fatal("buf_load_fd: read: %s", strerror(errno));
	buf->cb_len = buf->cb_size;

	return (buf);
}

void
buf_free(BUF *b)
{
	if (b == NULL)
		return;
	free(b->cb_buf);
	free(b);
}

/*
 * Free the buffer <b>'s structural information but do not free the contents
 * of the buffer.  Instead, they are returned and should be freed later.
 */
void *
buf_release(BUF *b)
{
	void *tmp;

	tmp = b->cb_buf;
	free(b);
	return (tmp);
}

/*
 * Append a single character <c> to the end of the buffer <b>.
 */
void
buf_putc(BUF *b, int c)
{
	u_char *bp;

	if (SIZE_LEFT(b) == 0)
		buf_grow(b, BUF_INCR);
	bp = b->cb_buf + b->cb_len;
	*bp = (u_char)c;
	b->cb_len++;
}

/*
 * Append a C-string <str> to the end of the buffer <b>.
 */
void
buf_puts(BUF *b, const char *str)
{
	buf_append(b, str, strlen(str));
}

/*
 * Append <len> bytes of data pointed to by <data> to the buffer <b>.  If the
 * buffer is too small to accept all data, it will get resized to an
 * appropriate size to accept all data.
 */
void
buf_append(BUF *b, const void *data, size_t len)
{
	size_t left;
	u_char *bp;

	left = SIZE_LEFT(b);

	if (left < len)
		buf_grow(b, len - left);

	bp = b->cb_buf + b->cb_len;
	memcpy(bp, data, len);
	b->cb_len += len;
}

/*
 * Returns the size of the buffer that is being used.
 */
size_t
buf_len(BUF *b)
{
	return (b->cb_len);
}

/*
 * Write the contents of the buffer <b> to the specified <fd>
 */
int
buf_write_fd(BUF *b, int fd)
{
	if (atomicio(vwrite, fd, b->cb_buf, b->cb_len) != b->cb_len)
		return (-1);
	return (0);
}

/*
 * Write the contents of the buffer <b> to the file whose path is given in
 * <path>.  If the file does not exist, it is created with mode <mode>.
 */
int
buf_write(BUF *b, const char *path, mode_t mode)
{
	int fd;
open:
	if ((fd = open(path, O_WRONLY|O_CREAT|O_TRUNC, mode)) == -1) {
		if (errno == EACCES && unlink(path) != -1)
			goto open;
		else
			fatal("open: `%s': %s", path, strerror(errno));
	}

	if (buf_write_fd(b, fd) == -1) {
		(void)unlink(path);
		fatal("buf_write: buf_write_fd: `%s'", path);
	}

	if (fchmod(fd, mode) < 0)
		cvs_log(LP_ERR, "permissions not set on file %s", path);

	(void)close(fd);

	return (0);
}

/*
 * Write the contents of the buffer <b> to a temporary file whose path is
 * specified using <template> (see mkstemp.3). If <tv> is specified file
 * access and modification time is set to <tv>.
 * NB. This function will modify <template>, as per mkstemp
 */
int
buf_write_stmp(BUF *b, char *template, struct timeval *tv)
{
	int fd;

	if ((fd = mkstemp(template)) == -1)
		fatal("mkstemp: `%s': %s", template, strerror(errno));

	if (buf_write_fd(b, fd) == -1) {
		(void)unlink(template);
		fatal("buf_write_stmp: buf_write_fd: `%s'", template);
	}

	if (tv != NULL) {
		if (futimes(fd, tv) == -1)
			fatal("buf_write_stmp: futimes failed");
	}

	worklist_add(template, &temp_files);

	if (lseek(fd, 0, SEEK_SET) < 0)
		fatal("buf_write_stmp: lseek: %s", strerror(errno));

	return (fd);
}

u_char *
buf_get(BUF *bp)
{
	return (bp->cb_buf);
}

int
buf_differ(const BUF *b1, const BUF *b2)
{
	if (b1->cb_len != b2->cb_len)
		return (1);

	return (memcmp(b1->cb_buf, b2->cb_buf, b1->cb_len));
}

/*
 * Grow the buffer <b> by <len> bytes.  The contents are unchanged by this
 * operation regardless of the result.
 */
static void
buf_grow(BUF *b, size_t len)
{
	b->cb_buf = xreallocarray(b->cb_buf, 1, b->cb_size + len);
	b->cb_size += len;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: buf.c,v 1.84 2016/10/15 22:20:17 millert Exp $ */
2			/*
3			* Copyright (c) 2003 Jean-Francois Brousseau <jfb@openbsd.org>
4			* All rights reserved.
5			*
6			* Redistribution and use in source and binary forms, with or without
7			* modification, are permitted provided that the following conditions
8			* are met:
9			*
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. The name of the author may not be used to endorse or promote products
13			* derived from this software without specific prior written permission.
14			*
15			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16			* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17			* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18			* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19			* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20			* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21			* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23			* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24			* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25			*/
26
27			#include <sys/stat.h>
28			#include <sys/time.h>
29
30			#include <errno.h>
31			#include <fcntl.h>
32			#include <stdint.h>
33			#include <stdlib.h>
34			#include <string.h>
35			#include <unistd.h>
36
37			#include "atomicio.h"
38			#include "cvs.h"
39			#include "buf.h"
40
41			#define BUF_INCR 128
42
43			struct buf {
44			/* buffer handle, buffer size, and data length */
45			u_char *cb_buf;
46			size_t cb_size;
47			size_t cb_len;
48			};
49
50			#define SIZE_LEFT(b) (b->cb_size - b->cb_len)
51
52			static void buf_grow(BUF *, size_t);
53
54			/*
55			* Create a new buffer structure and return a pointer to it. This structure
56			* uses dynamically-allocated memory and must be freed with buf_free(), once
57			* the buffer is no longer needed.
58			*/
59			BUF *
60			buf_alloc(size_t len)
61			{
62			BUF *b;
63
64		150	b = xmalloc(sizeof(*b));
65			/* Postpone creation of zero-sized buffers */
66	✓✓	75	if (len > 0)
67		65	b->cb_buf = xcalloc(1, len);
68			else
69			b->cb_buf = NULL;
70
71		75	b->cb_size = len;
72		75	b->cb_len = 0;
73
74		75	return (b);
75			}
76
77			/*
78			* Open the file specified by <path> and load all of its contents into a
79			* buffer.
80			* Returns the loaded buffer.
81			*/
82			BUF *
83			buf_load(const char *path)
84			{
85			int fd;
86			BUF *bp;
87
88	✗✓	22	if ((fd = open(path, O_RDONLY, 0600)) == -1)
89			fatal("buf_load: failed to load '%s' : %s", path,
90			strerror(errno));
91
92		11	bp = buf_load_fd(fd);
93		11	(void)close(fd);
94		11	return (bp);
95			}
96
97			BUF *
98			buf_load_fd(int fd)
99			{
100		56	struct stat st;
101			BUF *buf;
102
103	✗✓	28	if (fstat(fd, &st) == -1)
104			fatal("buf_load_fd: fstat: %s", strerror(errno));
105
106	✗✓	28	if (lseek(fd, 0, SEEK_SET) == -1)
107			fatal("buf_load_fd: lseek: %s", strerror(errno));
108
109	✗✓	28	if ((uintmax_t)st.st_size > SIZE_MAX)
110			fatal("buf_load_fd: file size too big");
111		28	buf = buf_alloc(st.st_size);
112	✗✓	28	if (atomicio(read, fd, buf->cb_buf, buf->cb_size) != buf->cb_size)
113			fatal("buf_load_fd: read: %s", strerror(errno));
114		28	buf->cb_len = buf->cb_size;
115
116		28	return (buf);
117		28	}
118
119			void
120			buf_free(BUF *b)
121			{
122	✓✗	40	if (b == NULL)
123			return;
124		20	free(b->cb_buf);
125		20	free(b);
126		40	}
127
128			/*
129			* Free the buffer <b>'s structural information but do not free the contents
130			* of the buffer. Instead, they are returned and should be freed later.
131			*/
132			void *
133			buf_release(BUF *b)
134			{
135			void *tmp;
136
137		110	tmp = b->cb_buf;
138		55	free(b);
139		55	return (tmp);
140			}
141
142			/*
143			* Append a single character <c> to the end of the buffer <b>.
144			*/
145			void
146			buf_putc(BUF *b, int c)
147			{
148			u_char *bp;
149
150	✓✓	26	if (SIZE_LEFT(b) == 0)
151		1	buf_grow(b, BUF_INCR);
152		13	bp = b->cb_buf + b->cb_len;
153		13	*bp = (u_char)c;
154		13	b->cb_len++;
155		13	}
156
157			/*
158			* Append a C-string <str> to the end of the buffer <b>.
159			*/
160			void
161			buf_puts(BUF b, const char str)
162			{
163		354	buf_append(b, str, strlen(str));
164		177	}
165
166			/*
167			* Append <len> bytes of data pointed to by <data> to the buffer <b>. If the
168			* buffer is too small to accept all data, it will get resized to an
169			* appropriate size to accept all data.
170			*/
171			void
172			buf_append(BUF b, const void data, size_t len)
173			{
174			size_t left;
175			u_char *bp;
176
177		480	left = SIZE_LEFT(b);
178
179	✗✓	240	if (left < len)
180			buf_grow(b, len - left);
181
182		240	bp = b->cb_buf + b->cb_len;
183		240	memcpy(bp, data, len);
184		240	b->cb_len += len;
185		240	}
186
187			/*
188			* Returns the size of the buffer that is being used.
189			*/
190			size_t
191			buf_len(BUF *b)
192			{
193		174	return (b->cb_len);
194			}
195
196			/*
197			* Write the contents of the buffer <b> to the specified <fd>
198			*/
199			int
200			buf_write_fd(BUF *b, int fd)
201			{
202	✗✓	8	if (atomicio(vwrite, fd, b->cb_buf, b->cb_len) != b->cb_len)
203			return (-1);
204		4	return (0);
205		4	}
206
207			/*
208			* Write the contents of the buffer <b> to the file whose path is given in
209			* <path>. If the file does not exist, it is created with mode <mode>.
210			*/
211			int
212			buf_write(BUF b, const char path, mode_t mode)
213			{
214			int fd;
215			open:
216			if ((fd = open(path, O_WRONLY\|O_CREAT\|O_TRUNC, mode)) == -1) {
217			if (errno == EACCES && unlink(path) != -1)
218			goto open;
219			else
220			fatal("open: `%s': %s", path, strerror(errno));
221			}
222
223			if (buf_write_fd(b, fd) == -1) {
224			(void)unlink(path);
225			fatal("buf_write: buf_write_fd: `%s'", path);
226			}
227
228			if (fchmod(fd, mode) < 0)
229			cvs_log(LP_ERR, "permissions not set on file %s", path);
230
231			(void)close(fd);
232
233			return (0);
234			}
235
236			/*
237			* Write the contents of the buffer <b> to a temporary file whose path is
238			* specified using <template> (see mkstemp.3). If <tv> is specified file
239			* access and modification time is set to <tv>.
240			* NB. This function will modify <template>, as per mkstemp
241			*/
242			int
243			buf_write_stmp(BUF b, char template, struct timeval *tv)
244			{
245			int fd;
246
247	✗✓	8	if ((fd = mkstemp(template)) == -1)
248			fatal("mkstemp: `%s': %s", template, strerror(errno));
249
250	✗✓	4	if (buf_write_fd(b, fd) == -1) {
251			(void)unlink(template);
252			fatal("buf_write_stmp: buf_write_fd: `%s'", template);
253			}
254
255	✓✓	4	if (tv != NULL) {
256	✗✓	2	if (futimes(fd, tv) == -1)
257			fatal("buf_write_stmp: futimes failed");
258			}
259
260		4	worklist_add(template, &temp_files);
261
262	✗✓	4	if (lseek(fd, 0, SEEK_SET) < 0)
263			fatal("buf_write_stmp: lseek: %s", strerror(errno));
264
265		4	return (fd);
266			}
267
268			u_char *
269			buf_get(BUF *bp)
270			{
271		92	return (bp->cb_buf);
272			}
273
274			int
275			buf_differ(const BUF b1, const BUF b2)
276			{
277	✓✗	16	if (b1->cb_len != b2->cb_len)
278		8	return (1);
279
280			return (memcmp(b1->cb_buf, b2->cb_buf, b1->cb_len));
281		8	}
282
283			/*
284			* Grow the buffer <b> by <len> bytes. The contents are unchanged by this
285			* operation regardless of the result.
286			*/
287			static void
288			buf_grow(BUF *b, size_t len)
289			{
290		2	b->cb_buf = xreallocarray(b->cb_buf, 1, b->cb_size + len);
291		1	b->cb_size += len;
292		1	}