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https://github.com/freebsd/freebsd-src
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212 lines
5.3 KiB
C
212 lines
5.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Sze-Tyan Wang.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/6/93";
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libcasper.h>
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#include <casper/cap_fileargs.h>
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#include "extern.h"
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/*
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* bytes -- read bytes to an offset from the end and display.
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*
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* This is the function that reads to a byte offset from the end of the input,
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* storing the data in a wrap-around buffer which is then displayed. If the
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* rflag is set, the data is displayed in lines in reverse order, and this
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* routine has the usual nastiness of trying to find the newlines. Otherwise,
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* it is displayed from the character closest to the beginning of the input to
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* the end.
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*/
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int
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bytes(FILE *fp, const char *fn, off_t off)
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{
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int ch, len, tlen;
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char *ep, *p, *t;
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int wrap;
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char *sp;
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if ((sp = p = malloc(off)) == NULL)
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err(1, "malloc");
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for (wrap = 0, ep = p + off; (ch = getc(fp)) != EOF;) {
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*p = ch;
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if (++p == ep) {
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wrap = 1;
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p = sp;
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}
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}
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if (ferror(fp)) {
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ierr(fn);
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free(sp);
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return 1;
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}
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if (rflag) {
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for (t = p - 1, len = 0; t >= sp; --t, ++len)
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if (*t == '\n' && len) {
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WR(t + 1, len);
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len = 0;
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}
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if (wrap) {
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tlen = len;
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for (t = ep - 1, len = 0; t >= p; --t, ++len)
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if (*t == '\n') {
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if (len) {
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WR(t + 1, len);
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len = 0;
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}
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if (tlen) {
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WR(sp, tlen);
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tlen = 0;
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}
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}
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if (len)
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WR(t + 1, len);
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if (tlen)
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WR(sp, tlen);
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}
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} else {
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if (wrap && (len = ep - p))
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WR(p, len);
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len = p - sp;
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if (len)
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WR(sp, len);
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}
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free(sp);
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return 0;
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}
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/*
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* lines -- read lines to an offset from the end and display.
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*
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* This is the function that reads to a line offset from the end of the input,
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* storing the data in an array of buffers which is then displayed. If the
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* rflag is set, the data is displayed in lines in reverse order, and this
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* routine has the usual nastiness of trying to find the newlines. Otherwise,
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* it is displayed from the line closest to the beginning of the input to
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* the end.
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*/
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int
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lines(FILE *fp, const char *fn, off_t off)
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{
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struct {
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int blen;
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u_int len;
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char *l;
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} *llines;
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int ch, rc;
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char *p, *sp;
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int blen, cnt, recno, wrap;
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if ((llines = calloc(off, sizeof(*llines))) == NULL)
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err(1, "calloc");
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p = sp = NULL;
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blen = cnt = recno = wrap = 0;
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rc = 0;
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while ((ch = getc(fp)) != EOF) {
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if (++cnt > blen) {
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if ((sp = realloc(sp, blen += 1024)) == NULL)
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err(1, "realloc");
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p = sp + cnt - 1;
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}
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*p++ = ch;
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if (ch == '\n') {
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if ((int)llines[recno].blen < cnt) {
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llines[recno].blen = cnt + 256;
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if ((llines[recno].l = realloc(llines[recno].l,
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llines[recno].blen)) == NULL)
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err(1, "realloc");
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}
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bcopy(sp, llines[recno].l, llines[recno].len = cnt);
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cnt = 0;
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p = sp;
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if (++recno == off) {
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wrap = 1;
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recno = 0;
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}
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}
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}
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if (ferror(fp)) {
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ierr(fn);
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rc = 1;
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goto done;
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}
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if (cnt) {
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llines[recno].l = sp;
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sp = NULL;
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llines[recno].len = cnt;
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if (++recno == off) {
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wrap = 1;
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recno = 0;
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}
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}
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if (rflag) {
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for (cnt = recno - 1; cnt >= 0; --cnt)
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WR(llines[cnt].l, llines[cnt].len);
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if (wrap)
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for (cnt = off - 1; cnt >= recno; --cnt)
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WR(llines[cnt].l, llines[cnt].len);
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} else {
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if (wrap)
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for (cnt = recno; cnt < off; ++cnt)
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WR(llines[cnt].l, llines[cnt].len);
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for (cnt = 0; cnt < recno; ++cnt)
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WR(llines[cnt].l, llines[cnt].len);
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}
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done:
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for (cnt = 0; cnt < off; cnt++)
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free(llines[cnt].l);
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free(sp);
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free(llines);
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return (rc);
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}
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