2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Edward Sze-Tyan Wang.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 static const char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/6/93";
43 #include <sys/types.h>
54 #include <libcasper.h>
55 #include <casper/cap_fileargs.h>
60 * bytes -- read bytes to an offset from the end and display.
62 * This is the function that reads to a byte offset from the end of the input,
63 * storing the data in a wrap-around buffer which is then displayed. If the
64 * rflag is set, the data is displayed in lines in reverse order, and this
65 * routine has the usual nastiness of trying to find the newlines. Otherwise,
66 * it is displayed from the character closest to the beginning of the input to
70 bytes(FILE *fp, const char *fn, off_t off)
77 if ((sp = p = malloc(off)) == NULL)
80 for (wrap = 0, ep = p + off; (ch = getc(fp)) != EOF;) {
94 for (t = p - 1, len = 0; t >= sp; --t, ++len)
95 if (*t == '\n' && len) {
101 for (t = ep - 1, len = 0; t >= p; --t, ++len)
118 if (wrap && (len = ep - p))
130 * lines -- read lines to an offset from the end and display.
132 * This is the function that reads to a line offset from the end of the input,
133 * storing the data in an array of buffers which is then displayed. If the
134 * rflag is set, the data is displayed in lines in reverse order, and this
135 * routine has the usual nastiness of trying to find the newlines. Otherwise,
136 * it is displayed from the line closest to the beginning of the input to
140 lines(FILE *fp, const char *fn, off_t off)
149 int blen, cnt, recno, wrap;
151 if ((llines = calloc(off, sizeof(*llines))) == NULL)
154 blen = cnt = recno = wrap = 0;
157 while ((ch = getc(fp)) != EOF) {
159 if ((sp = realloc(sp, blen += 1024)) == NULL)
165 if ((int)llines[recno].blen < cnt) {
166 llines[recno].blen = cnt + 256;
167 if ((llines[recno].l = realloc(llines[recno].l,
168 llines[recno].blen)) == NULL)
171 bcopy(sp, llines[recno].l, llines[recno].len = cnt);
174 if (++recno == off) {
186 llines[recno].l = sp;
188 llines[recno].len = cnt;
189 if (++recno == off) {
196 for (cnt = recno - 1; cnt >= 0; --cnt)
197 WR(llines[cnt].l, llines[cnt].len);
199 for (cnt = off - 1; cnt >= recno; --cnt)
200 WR(llines[cnt].l, llines[cnt].len);
203 for (cnt = recno; cnt < off; ++cnt)
204 WR(llines[cnt].l, llines[cnt].len);
205 for (cnt = 0; cnt < recno; ++cnt)
206 WR(llines[cnt].l, llines[cnt].len);
209 for (cnt = 0; cnt < off; cnt++)