Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/tail/read.c	Lines:	37	83	44.6 %
Date:	2017-11-07	Branches:	32	116	27.6 %


/*	$OpenBSD: read.c,v 1.20 2017/03/26 19:55:07 martijn Exp $	*/
/*	$NetBSD: read.c,v 1.4 1994/11/23 07:42:07 jtc Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Sze-Tyan Wang.
 *
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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/types.h>
#include <sys/stat.h>

#include <err.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

/*
 * bytes -- read bytes to an offset from the end and display.
 *
 * This is the function that reads to a byte offset from the end of the input,
 * storing the data in a wrap-around buffer which is then displayed.  If the
 * rflag is set, the data is displayed in lines in reverse order, and this
 * routine has the usual nastiness of trying to find the newlines.  Otherwise,
 * it is displayed from the character closest to the beginning of the input to
 * the end.
 *
 * A non-zero return means an (non-fatal) error occurred.
 *
 */
int
bytes(struct tailfile *tf, off_t off)
{
	int ch;
	size_t len, tlen;
	char *ep, *p, *t;
	int wrap;
	char *sp;

	if (off > SIZE_MAX)
		errx(1, "offset too large");

	if ((sp = p = malloc(off)) == NULL)
		err(1, NULL);

	for (wrap = 0, ep = p + off; (ch = getc(tf->fp)) != EOF;) {
		*p = ch;
		if (++p == ep) {
			wrap = 1;
			p = sp;
		}
	}
	if (ferror(tf->fp)) {
		ierr(tf->fname);
		free(sp);
		return(1);
	}

	if (rflag) {
		for (t = p - 1, len = 0; t >= sp; --t, ++len)
			if (*t == '\n' && len) {
				WR(t + 1, len);
				len = 0;
			}
		if (wrap) {
			tlen = len;
			for (t = ep - 1, len = 0; t >= p; --t, ++len)
				if (*t == '\n') {
					if (len) {
						WR(t + 1, len);
						len = 0;
					}
					if (tlen) {
						WR(sp, tlen);
						tlen = 0;
					}
				}
			if (len)
				WR(t + 1, len);
			if (tlen)
				WR(sp, tlen);
		}
	} else {
		if (wrap && (len = ep - p))
			WR(p, len);
		if ((len = p - sp))
			WR(sp, len);
	}

	free(sp);
	return(0);
}

/*
 * lines -- read lines to an offset from the end and display.
 *
 * This is the function that reads to a line offset from the end of the input,
 * storing the data in an array of buffers which is then displayed.  If the
 * rflag is set, the data is displayed in lines in reverse order, and this
 * routine has the usual nastiness of trying to find the newlines.  Otherwise,
 * it is displayed from the line closest to the beginning of the input to
 * the end.
 *
 * A non-zero return means an (non-fatal) error occurred.
 *
 */
int
lines(struct tailfile *tf, off_t off)
{
	struct {
		size_t blen;
		size_t len;
		char *l;
	} *lines = NULL;
	int ch, rc = 0;
	char *p = NULL;
	int wrap;
	size_t cnt, lineno, nlineno, recno, blen, newsize;
	char *sp = NULL, *newp = NULL;

	if (off > SIZE_MAX)
		errx(1, "offset too large");

	lineno = blen = cnt = recno = wrap = 0;

	while ((ch = getc(tf->fp)) != EOF) {
		if (++cnt > blen) {
			newsize = blen + 1024;
			if ((newp = realloc(sp, newsize)) == NULL)
				err(1, NULL);
			sp = newp;
			blen = newsize;
			p = sp + cnt - 1;
		}
		*p++ = ch;
		if (recno >= lineno) {
			nlineno = (lineno + 1024) > off ?
			    (size_t) off : lineno + 1024;
			if ((lines = recallocarray(lines, lineno, nlineno,
			    sizeof(*lines))) == NULL)
				err(1, NULL);
			lineno = nlineno;
		}
		if (ch == '\n') {
			if (lines[recno].blen < cnt) {
				newsize = cnt + 256;
				if ((newp = realloc(lines[recno].l,
				    newsize)) == NULL)
					err(1, NULL);
				lines[recno].l = newp;
				lines[recno].blen = newsize;
			}
			memcpy(lines[recno].l, sp, (lines[recno].len = cnt));
			cnt = 0;
			p = sp;
			if (++recno == off) {
				wrap = 1;
				recno = 0;
			}
		}
	}
	if (ferror(tf->fp)) {
		ierr(tf->fname);
		rc = 1;
		goto done;
	}
	if (cnt) {
		lines[recno].l = sp;
		lines[recno].len = cnt;
		sp = NULL;
		if (++recno == off) {
			wrap = 1;
			recno = 0;
		}
	}

	if (rflag) {
		for (cnt = recno; cnt > 0; --cnt)
			WR(lines[cnt - 1].l, lines[cnt - 1].len);
		if (wrap)
			for (cnt = off; cnt > recno; --cnt)
				WR(lines[cnt - 1].l, lines[cnt - 1].len);
	} else {
		if (wrap)
			for (cnt = recno; cnt < off; ++cnt)
				WR(lines[cnt].l, lines[cnt].len);
		for (cnt = 0; cnt < recno; ++cnt)
			WR(lines[cnt].l, lines[cnt].len);
	}
done:
	for (cnt = 0; cnt < lineno; cnt++)
		free(lines[cnt].l);
	free(sp);
	free(lines);
	return(rc);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: read.c,v 1.20 2017/03/26 19:55:07 martijn Exp $ */
2			/* $NetBSD: read.c,v 1.4 1994/11/23 07:42:07 jtc Exp $ */
3
4			/*-
5			* Copyright (c) 1991, 1993
6			* The Regents of the University of California. All rights reserved.
7			*
8			* This code is derived from software contributed to Berkeley by
9			* Edward Sze-Tyan Wang.
10			*
11			* Redistribution and use in source and binary forms, with or without
12			* modification, are permitted provided that the following conditions
13			* are met:
14			* 1. Redistributions of source code must retain the above copyright
15			* notice, this list of conditions and the following disclaimer.
16			* 2. Redistributions in binary form must reproduce the above copyright
17			* notice, this list of conditions and the following disclaimer in the
18			* documentation and/or other materials provided with the distribution.
19			* 3. Neither the name of the University nor the names of its contributors
20			* may be used to endorse or promote products derived from this software
21			* without specific prior written permission.
22			*
23			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33			* SUCH DAMAGE.
34			*/
35
36			#include <sys/types.h>
37			#include <sys/stat.h>
38
39			#include <err.h>
40			#include <stdio.h>
41			#include <stdint.h>
42			#include <stdlib.h>
43			#include <string.h>
44			#include <unistd.h>
45
46			#include "extern.h"
47
48			/*
49			* bytes -- read bytes to an offset from the end and display.
50			*
51			* This is the function that reads to a byte offset from the end of the input,
52			* storing the data in a wrap-around buffer which is then displayed. If the
53			* rflag is set, the data is displayed in lines in reverse order, and this
54			* routine has the usual nastiness of trying to find the newlines. Otherwise,
55			* it is displayed from the character closest to the beginning of the input to
56			* the end.
57			*
58			* A non-zero return means an (non-fatal) error occurred.
59			*
60			*/
61			int
62			bytes(struct tailfile *tf, off_t off)
63			{
64			int ch;
65			size_t len, tlen;
66			char ep, p, *t;
67			int wrap;
68			char *sp;
69
70			if (off > SIZE_MAX)
71			errx(1, "offset too large");
72
73			if ((sp = p = malloc(off)) == NULL)
74			err(1, NULL);
75
76			for (wrap = 0, ep = p + off; (ch = getc(tf->fp)) != EOF;) {
77			*p = ch;
78			if (++p == ep) {
79			wrap = 1;
80			p = sp;
81			}
82			}
83			if (ferror(tf->fp)) {
84			ierr(tf->fname);
85			free(sp);
86			return(1);
87			}
88
89			if (rflag) {
90			for (t = p - 1, len = 0; t >= sp; --t, ++len)
91			if (*t == '\n' && len) {
92			WR(t + 1, len);
93			len = 0;
94			}
95			if (wrap) {
96			tlen = len;
97			for (t = ep - 1, len = 0; t >= p; --t, ++len)
98			if (*t == '\n') {
99			if (len) {
100			WR(t + 1, len);
101			len = 0;
102			}
103			if (tlen) {
104			WR(sp, tlen);
105			tlen = 0;
106			}
107			}
108			if (len)
109			WR(t + 1, len);
110			if (tlen)
111			WR(sp, tlen);
112			}
113			} else {
114			if (wrap && (len = ep - p))
115			WR(p, len);
116			if ((len = p - sp))
117			WR(sp, len);
118			}
119
120			free(sp);
121			return(0);
122			}
123
124			/*
125			* lines -- read lines to an offset from the end and display.
126			*
127			* This is the function that reads to a line offset from the end of the input,
128			* storing the data in an array of buffers which is then displayed. If the
129			* rflag is set, the data is displayed in lines in reverse order, and this
130			* routine has the usual nastiness of trying to find the newlines. Otherwise,
131			* it is displayed from the line closest to the beginning of the input to
132			* the end.
133			*
134			* A non-zero return means an (non-fatal) error occurred.
135			*
136			*/
137			int
138			lines(struct tailfile *tf, off_t off)
139			{
140			struct {
141			size_t blen;
142			size_t len;
143			char *l;
144			} *lines = NULL;
145			int ch, rc = 0;
146			char *p = NULL;
147			int wrap;
148			size_t cnt, lineno, nlineno, recno, blen, newsize;
149			char sp = NULL, newp = NULL;
150
151	✗✓	228	if (off > SIZE_MAX)
152			errx(1, "offset too large");
153
154			lineno = blen = cnt = recno = wrap = 0;
155
156	✓✗✓✓ ✓✓	66362	while ((ch = getc(tf->fp)) != EOF) {
157	✓✓	16448	if (++cnt > blen) {
158		114	newsize = blen + 1024;
159	✗✓	114	if ((newp = realloc(sp, newsize)) == NULL)
160			err(1, NULL);
161			sp = newp;
162			blen = newsize;
163		114	p = sp + cnt - 1;
164		114	}
165		16448	*p++ = ch;
166	✓✓	16448	if (recno >= lineno) {
167		114	nlineno = (lineno + 1024) > off ?
168			(size_t) off : lineno + 1024;
169	✗✓	228	if ((lines = recallocarray(lines, lineno, nlineno,
170		114	sizeof(*lines))) == NULL)
171			err(1, NULL);
172			lineno = nlineno;
173		114	}
174	✓✓	16448	if (ch == '\n') {
175	✓✓	1115	if (lines[recno].blen < cnt) {
176		118	newsize = cnt + 256;
177	✗✓	236	if ((newp = realloc(lines[recno].l,
178		118	newsize)) == NULL)
179			err(1, NULL);
180		118	lines[recno].l = newp;
181		118	lines[recno].blen = newsize;
182		118	}
183		1115	memcpy(lines[recno].l, sp, (lines[recno].len = cnt));
184			cnt = 0;
185			p = sp;
186	✓✓	1115	if (++recno == off) {
187			wrap = 1;
188			recno = 0;
189		1109	}
190			}
191			}
192	✓✗✗✓ ✗✗	228	if (ferror(tf->fp)) {
193			ierr(tf->fname);
194			rc = 1;
195			goto done;
196			}
197	✗✓	114	if (cnt) {
198			lines[recno].l = sp;
199			lines[recno].len = cnt;
200			sp = NULL;
201			if (++recno == off) {
202			wrap = 1;
203			recno = 0;
204			}
205			}
206
207	✗✓	114	if (rflag) {
208			for (cnt = recno; cnt > 0; --cnt)
209			WR(lines[cnt - 1].l, lines[cnt - 1].len);
210			if (wrap)
211			for (cnt = off; cnt > recno; --cnt)
212			WR(lines[cnt - 1].l, lines[cnt - 1].len);
213			} else {
214	✓✗	114	if (wrap)
215	✓✓	460	for (cnt = recno; cnt < off; ++cnt)
216	✗✓	116	WR(lines[cnt].l, lines[cnt].len);
217	✓✓	232	for (cnt = 0; cnt < recno; ++cnt)
218	✗✓	2	WR(lines[cnt].l, lines[cnt].len);
219			}
220			done:
221	✓✓	464	for (cnt = 0; cnt < lineno; cnt++)
222		118	free(lines[cnt].l);
223		114	free(sp);
224		114	free(lines);
225		114	return(rc);
226			}