diff options
Diffstat (limited to 'usr.bin/tail/read.c')
| -rw-r--r-- | usr.bin/tail/read.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/usr.bin/tail/read.c b/usr.bin/tail/read.c deleted file mode 100644 index dc570a3..0000000 --- a/usr.bin/tail/read.c +++ /dev/null @@ -1,198 +0,0 @@ -/*- - * 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. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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. - */ - -#ifndef lint -static char sccsid[] = "@(#)read.c 8.1 (Berkeley) 6/6/93"; -#endif /* not lint */ - -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <errno.h> -#include <unistd.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.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. - */ -void -bytes(fp, off) - register FILE *fp; - off_t off; -{ - register int ch, len, tlen; - register char *ep, *p, *t; - int wrap; - char *sp; - - if ((sp = p = malloc(off)) == NULL) - err(1, "%s", strerror(errno)); - - for (wrap = 0, ep = p + off; (ch = getc(fp)) != EOF;) { - *p = ch; - if (++p == ep) { - wrap = 1; - p = sp; - } - } - if (ferror(fp)) { - ierr(); - return; - } - - 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); - } -} - -/* - * 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. - */ -void -lines(fp, off) - register FILE *fp; - off_t off; -{ - struct { - u_int blen; - u_int len; - char *l; - } *lines; - register int ch; - register char *p; - int blen, cnt, recno, wrap; - char *sp; - - if ((lines = malloc(off * sizeof(*lines))) == NULL) - err(1, "%s", strerror(errno)); - - sp = NULL; - blen = cnt = recno = wrap = 0; - - while ((ch = getc(fp)) != EOF) { - if (++cnt > blen) { - if ((sp = realloc(sp, blen += 1024)) == NULL) - err(1, "%s", strerror(errno)); - p = sp + cnt - 1; - } - *p++ = ch; - if (ch == '\n') { - if (lines[recno].blen < cnt) { - lines[recno].blen = cnt + 256; - if ((lines[recno].l = realloc(lines[recno].l, - lines[recno].blen)) == NULL) - err(1, "%s", strerror(errno)); - } - bcopy(sp, lines[recno].l, lines[recno].len = cnt); - cnt = 0; - p = sp; - if (++recno == off) { - wrap = 1; - recno = 0; - } - } - } - if (ferror(fp)) { - ierr(); - return; - } - if (cnt) { - lines[recno].l = sp; - lines[recno].len = cnt; - if (++recno == off) { - wrap = 1; - recno = 0; - } - } - - if (rflag) { - for (cnt = recno - 1; cnt >= 0; --cnt) - WR(lines[cnt].l, lines[cnt].len); - if (wrap) - for (cnt = off - 1; cnt >= recno; --cnt) - WR(lines[cnt].l, lines[cnt].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); - } -} |
