Rewrote tail.
This commit is contained in:
Matt Kraai
parent
defcd5e75e
commit
55bccf315e
474
coreutils/tail.c
474
coreutils/tail.c
@ -1,65 +1,30 @@
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/* vi: set sw=4 ts=4: */
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/* tail -- output the last part of file(s)
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Copyright (C) 89, 90, 91, 95, 1996 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Original version by Paul Rubin <phr@ocf.berkeley.edu>.
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Extensions by David MacKenzie <djm@gnu.ai.mit.edu>.
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tail -f for multiple files by Ian Lance Taylor <ian@airs.com>.
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Rewrote the option parser, removed locales support,
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and generally busyboxed, Erik Andersen <andersen@lineo.com>
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Removed superfluous options and associated code ("-c", "-n", "-q").
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Removed "tail -f" support for multiple files.
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Both changes by Friedrich Vedder <fwv@myrtle.lahn.de>.
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Compleate Rewrite to correctly support "-NUM", "+NUM", and "-s" by
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E.Allen Soard (esp@espsw.net).
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/*
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* Mini tail implementation for busybox
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*
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*
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* Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sys/types.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 <unistd.h>
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#include <string.h>
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#include <getopt.h>
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#include "busybox.h"
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#define STDIN "standard input"
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#define LINES 0
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#define BYTES 1
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static int n_files = 0;
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static char **files = NULL;
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static char * buffer;
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static ssize_t bytes_read=0;
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static ssize_t bs;
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static ssize_t filelocation=0;
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static char pip;
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#ifdef BB_FEATURE_SIMPLE_TAIL
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static const char unit_type=LINES;
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#else
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static char unit_type=LINES;
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static char verbose = 0;
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#endif
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static off_t units=0;
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#include <sys/types.h>
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#include <fcntl.h>
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static struct suffix_mult tail_suffixes[] = {
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{ "b", 512 },
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@ -68,232 +33,217 @@ static struct suffix_mult tail_suffixes[] = {
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{ NULL, 0 }
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};
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static int tail_stream(int fd)
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{
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ssize_t startpoint;
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ssize_t endpoint=0;
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ssize_t count=0;
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ssize_t filesize=0;
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int direction=1;
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filelocation=0;
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startpoint=bs=BUFSIZ;
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filesize=lseek(fd, -1, SEEK_END)+1;
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pip=(filesize<=0);
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if(units>=0)
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lseek(fd,0,SEEK_SET);
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else {
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direction=-1;
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count=1;
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}
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while(units != 0) {
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if (pip) {
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char * line;
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ssize_t f_size=0;
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bs=BUFSIZ;
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line=xmalloc(bs);
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while(1) {
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bytes_read=read(fd,line,bs);
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if(bytes_read<=0)
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break;
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buffer=xrealloc(buffer,f_size+bytes_read);
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memcpy(&buffer[f_size],line,bytes_read);
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filelocation=f_size+=bytes_read;
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}
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bs=f_size;
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if(direction<0)
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bs--;
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if (line)
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free(line);
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} else {
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filelocation = lseek(fd, 0, SEEK_CUR);
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if(direction<0) {
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if(filelocation<bs)
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bs=filelocation;
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filelocation = lseek(fd, -bs, SEEK_CUR);
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}
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bytes_read = read(fd, buffer, bs);
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if (bytes_read <= 0)
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break;
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bs=bytes_read;
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}
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startpoint=bs;
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if(direction>0) {
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endpoint=startpoint;
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startpoint=0;
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}
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for(;startpoint!=endpoint;startpoint+=direction) {
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#ifndef BB_FEATURE_SIMPLE_TAIL
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if(unit_type==BYTES)
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count++;
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else
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static struct suffix_mult null_suffixes[] = {
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{ NULL, 0 }
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};
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#endif
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if(buffer[startpoint-1]=='\n')
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count++;
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if (!pip)
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filelocation=lseek(fd,0,SEEK_CUR);
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if(count==units*direction)
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break;
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}
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if((count==units*direction) | pip)
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break;
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if(direction<0){
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filelocation = lseek(fd, -bytes_read, SEEK_CUR);
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if(filelocation==0)
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break;
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}
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}
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if(pip && (direction<0))
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bs++;
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bytes_read=bs-startpoint;
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memcpy(&buffer[0],&buffer[startpoint],bytes_read);
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return 0;
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#define BYTES 0
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#define LINES 1
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static char *tailbuf;
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static int taillen;
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static int newline;
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void tailbuf_append(char *buf, int len)
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{
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tailbuf = xrealloc(tailbuf, taillen + len);
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memcpy(tailbuf + taillen, buf, len);
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taillen += len;
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}
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void add_file(char *name)
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void tailbuf_trunc()
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{
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++n_files;
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files = xrealloc(files, n_files);
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files[n_files - 1] = (char *) xmalloc(strlen(name) + 1);
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strcpy(files[n_files - 1], name);
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char *s;
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s = memchr(tailbuf, '\n', taillen);
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memmove(tailbuf, s + 1, taillen - ((s + 1) - tailbuf));
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taillen -= (s + 1) - tailbuf;
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newline = 0;
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}
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int tail_main(int argc, char **argv)
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{
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int show_headers = 1;
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int test;
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int opt;
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char follow=0;
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int sleep_int=1;
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int *fd;
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opterr = 0;
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while ((opt=getopt(argc,argv,"c:fhn:s:q:v")) >0) {
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int from_top = 0, units = LINES, count = 10, sleep_period = 1;
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int show_headers = 0, hide_headers = 0, follow = 0;
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int *fds, nfiles = 0, status = EXIT_SUCCESS, nread, nwrite, seen = 0;
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char *s, *start, *end, buf[BUFSIZ];
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int i, opt;
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while ((opt = getopt(argc, argv, "c:fhn:q:s:v")) > 0) {
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switch (opt) {
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case 'f':
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follow = 1;
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break;
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#ifndef BB_FEATURE_SIMPLE_TAIL
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case 'q':
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show_headers = 0;
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break;
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case 's':
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sleep_int = atoi(optarg);
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if(sleep_int<1)
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sleep_int=1;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'c':
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unit_type = BYTES;
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/* FALLS THROUGH */
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case 'c':
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units = BYTES;
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/* FALLS THROUGH */
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#endif
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case 'n':
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test = parse_number(optarg, tail_suffixes);
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if (test) {
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case 'n':
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count = parse_number(optarg, tail_suffixes);
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if (count < 0)
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count = -count;
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if (optarg[0] == '+')
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units = test;
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else
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units = -(test+1);
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} else
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usage(tail_usage);
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break;
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case 'f':
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follow = 1;
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break;
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default:
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usage(tail_usage);
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}
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}
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while (optind <= argc) {
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if(optind==argc) {
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if (n_files==0)
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add_file(STDIN);
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else
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from_top = 1;
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break;
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}else {
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if (!strcmp(argv[optind], "-")) {
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add_file(STDIN);
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} else {
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add_file(argv[optind]);
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}
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optind++;
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}
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}
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if(units==0)
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units=-11;
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if(units>0)
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units--;
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fd=xmalloc(sizeof(int)*n_files);
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if (n_files == 1)
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#ifndef BB_FEATURE_SIMPLE_TAIL
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if (!verbose)
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#endif
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show_headers = 0;
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buffer=xmalloc(BUFSIZ);
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for (test = 0; test < n_files; test++) {
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if (show_headers)
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printf("==> %s <==\n", files[test]);
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if (!strcmp(files[test], STDIN))
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fd[test] = 0;
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else
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fd[test] = open(files[test], O_RDONLY);
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if (fd[test] == -1)
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error_msg_and_die("Unable to open file %s.\n", files[test]);
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tail_stream(fd[test]);
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bs=BUFSIZ;
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while (1) {
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if((filelocation>0 || pip)){
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write(1,buffer,bytes_read);
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}
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bytes_read = read(fd[test], buffer, bs);
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filelocation+=bytes_read;
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if (bytes_read <= 0) {
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case 'q':
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hide_headers = 1;
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break;
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}
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usleep(sleep_int * 1000);
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case 's':
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sleep_period = parse_number(optarg, null_suffixes);
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break;
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case 'v':
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show_headers = 1;
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break;
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#endif
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default:
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usage(tail_usage);
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}
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if(n_files>1)
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printf("\n");
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}
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while(1){
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for (test = 0; test < n_files; test++) {
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if(!follow){
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close(fd[test]);
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continue;
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/* open all the files */
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fds = (int *)xmalloc(sizeof(int) * (argc - optind + 1));
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if (argc == optind) {
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fds[nfiles++] = STDIN_FILENO;
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argv[optind] = "standard input";
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} else {
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for (i = optind; i < argc; i++) {
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if (strcmp(argv[i], "-") == 0) {
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fds[nfiles++] = STDIN_FILENO;
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argv[i] = "standard input";
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} else if ((fds[nfiles++] = open(argv[i], O_RDONLY)) < 0) {
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perror_msg("%s", argv[i]);
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status = EXIT_FAILURE;
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}
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}
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}
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#ifndef BB_FEATURE_SIMPLE_TAIL
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/* tail the files */
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if (!from_top && units == BYTES)
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tailbuf = xmalloc(count);
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#endif
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for (i = 0; i < nfiles; i++) {
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if (fds[i] == -1)
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continue;
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seen = 0;
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if (show_headers || (!hide_headers && nfiles > 1))
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printf("%s==> %s <==\n", i == 0 ? "" : "\n", argv[optind + i]);
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while ((nread = safe_read(fds[i], buf, sizeof(buf))) > 0) {
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if (from_top) {
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#ifndef BB_FEATURE_SIMPLE_TAIL
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if (units == BYTES) {
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if (count - 1 <= seen)
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nwrite = nread;
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else if (count - 1 <= seen + nread)
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nwrite = nread + seen - (count - 1);
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else
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nwrite = 0;
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seen += nread;
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} else {
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#else
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{
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#endif
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if (count - 1 <= seen)
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nwrite = nread;
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else {
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nwrite = 0;
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for (s = memchr(buf, '\n', nread); s != NULL;
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s = memchr(s+1, '\n', nread - (s + 1 - buf))) {
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if (count - 1 <= ++seen) {
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nwrite = nread - (s + 1 - buf);
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break;
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}
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}
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}
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}
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if (full_write(STDOUT_FILENO, buf + nread - nwrite,
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nwrite) < 0) {
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perror_msg("write");
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status = EXIT_FAILURE;
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break;
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}
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} else {
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sleep(sleep_int);
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bytes_read = read(fd[test], buffer, bs);
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if(bytes_read>0) {
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if (show_headers)
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printf("==> %s <==\n", files[test]);
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write(1,buffer,bytes_read);
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if(n_files>1)
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printf("\n");
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#ifndef BB_FEATURE_SIMPLE_TAIL
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if (units == BYTES) {
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if (nread < count) {
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memmove(tailbuf, tailbuf + nread, count - nread);
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memcpy(tailbuf + count - nread, buf, nread);
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} else {
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memcpy(tailbuf, buf + nread - count, count);
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}
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seen += nread;
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} else {
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#else
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{
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#endif
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for (start = buf, end = memchr(buf, '\n', nread);
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end != NULL; start = end+1,
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end = memchr(start, '\n', nread - (start - buf))) {
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if (newline && count <= seen)
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tailbuf_trunc();
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tailbuf_append(start, end - start + 1);
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seen++;
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newline = 1;
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}
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if (newline && count <= seen && nread - (start - buf) > 0)
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tailbuf_trunc();
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tailbuf_append(start, nread - (start - buf));
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}
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}
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}
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if(!follow)
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break;
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}
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if (fd)
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free(fd);
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if (buffer)
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free(buffer);
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if(files)
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free(files);
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return 0;
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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if (nread < 0) {
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perror_msg("read");
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status = EXIT_FAILURE;
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}
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#ifndef BB_FEATURE_SIMPLE_TAIL
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if (!from_top && units == BYTES) {
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if (count < seen)
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seen = count;
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if (full_write(STDOUT_FILENO, tailbuf + count - seen, seen) < 0) {
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perror_msg("write");
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status = EXIT_FAILURE;
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}
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}
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#endif
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if (!from_top && units == LINES) {
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if (full_write(STDOUT_FILENO, tailbuf, taillen) < 0) {
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perror_msg("write");
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status = EXIT_FAILURE;
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}
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}
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taillen = 0;
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}
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while (follow) {
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sleep(sleep_period);
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for (i = 0; i < nfiles; i++) {
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if (fds[i] == -1)
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continue;
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if ((nread = safe_read(fds[i], buf, sizeof(buf))) > 0) {
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if (show_headers || (!hide_headers && nfiles > 1))
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printf("\n==> %s <==\n", argv[optind + i]);
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do {
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full_write(STDOUT_FILENO, buf, nread);
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} while ((nread = safe_read(fds[i], buf, sizeof(buf))) > 0);
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}
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if (nread < 0) {
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perror_msg("read");
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status = EXIT_FAILURE;
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}
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}
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}
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return status;
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}
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||||
474
tail.c
474
tail.c
@ -1,65 +1,30 @@
|
||||
/* vi: set sw=4 ts=4: */
|
||||
/* tail -- output the last part of file(s)
|
||||
Copyright (C) 89, 90, 91, 95, 1996 Free Software Foundation, Inc.
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2, or (at your option)
|
||||
any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||||
|
||||
Original version by Paul Rubin <phr@ocf.berkeley.edu>.
|
||||
Extensions by David MacKenzie <djm@gnu.ai.mit.edu>.
|
||||
tail -f for multiple files by Ian Lance Taylor <ian@airs.com>.
|
||||
|
||||
Rewrote the option parser, removed locales support,
|
||||
and generally busyboxed, Erik Andersen <andersen@lineo.com>
|
||||
|
||||
Removed superfluous options and associated code ("-c", "-n", "-q").
|
||||
Removed "tail -f" support for multiple files.
|
||||
Both changes by Friedrich Vedder <fwv@myrtle.lahn.de>.
|
||||
|
||||
Compleate Rewrite to correctly support "-NUM", "+NUM", and "-s" by
|
||||
E.Allen Soard (esp@espsw.net).
|
||||
|
||||
/*
|
||||
* Mini tail implementation for busybox
|
||||
*
|
||||
*
|
||||
* Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*
|
||||
*/
|
||||
#include <sys/types.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <string.h>
|
||||
#include <getopt.h>
|
||||
|
||||
#include "busybox.h"
|
||||
|
||||
#define STDIN "standard input"
|
||||
#define LINES 0
|
||||
#define BYTES 1
|
||||
|
||||
static int n_files = 0;
|
||||
static char **files = NULL;
|
||||
static char * buffer;
|
||||
static ssize_t bytes_read=0;
|
||||
static ssize_t bs;
|
||||
static ssize_t filelocation=0;
|
||||
static char pip;
|
||||
|
||||
#ifdef BB_FEATURE_SIMPLE_TAIL
|
||||
static const char unit_type=LINES;
|
||||
#else
|
||||
static char unit_type=LINES;
|
||||
static char verbose = 0;
|
||||
#endif
|
||||
|
||||
static off_t units=0;
|
||||
#include <sys/types.h>
|
||||
#include <fcntl.h>
|
||||
|
||||
static struct suffix_mult tail_suffixes[] = {
|
||||
{ "b", 512 },
|
||||
@ -68,232 +33,217 @@ static struct suffix_mult tail_suffixes[] = {
|
||||
{ NULL, 0 }
|
||||
};
|
||||
|
||||
static int tail_stream(int fd)
|
||||
{
|
||||
ssize_t startpoint;
|
||||
ssize_t endpoint=0;
|
||||
ssize_t count=0;
|
||||
ssize_t filesize=0;
|
||||
int direction=1;
|
||||
|
||||
filelocation=0;
|
||||
startpoint=bs=BUFSIZ;
|
||||
|
||||
filesize=lseek(fd, -1, SEEK_END)+1;
|
||||
pip=(filesize<=0);
|
||||
|
||||
if(units>=0)
|
||||
lseek(fd,0,SEEK_SET);
|
||||
else {
|
||||
direction=-1;
|
||||
count=1;
|
||||
}
|
||||
while(units != 0) {
|
||||
if (pip) {
|
||||
char * line;
|
||||
ssize_t f_size=0;
|
||||
|
||||
bs=BUFSIZ;
|
||||
line=xmalloc(bs);
|
||||
while(1) {
|
||||
bytes_read=read(fd,line,bs);
|
||||
if(bytes_read<=0)
|
||||
break;
|
||||
buffer=xrealloc(buffer,f_size+bytes_read);
|
||||
memcpy(&buffer[f_size],line,bytes_read);
|
||||
filelocation=f_size+=bytes_read;
|
||||
}
|
||||
bs=f_size;
|
||||
if(direction<0)
|
||||
bs--;
|
||||
if (line)
|
||||
free(line);
|
||||
} else {
|
||||
filelocation = lseek(fd, 0, SEEK_CUR);
|
||||
if(direction<0) {
|
||||
if(filelocation<bs)
|
||||
bs=filelocation;
|
||||
filelocation = lseek(fd, -bs, SEEK_CUR);
|
||||
}
|
||||
bytes_read = read(fd, buffer, bs);
|
||||
if (bytes_read <= 0)
|
||||
break;
|
||||
bs=bytes_read;
|
||||
}
|
||||
startpoint=bs;
|
||||
if(direction>0) {
|
||||
endpoint=startpoint;
|
||||
startpoint=0;
|
||||
}
|
||||
for(;startpoint!=endpoint;startpoint+=direction) {
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
if(unit_type==BYTES)
|
||||
count++;
|
||||
else
|
||||
static struct suffix_mult null_suffixes[] = {
|
||||
{ NULL, 0 }
|
||||
};
|
||||
#endif
|
||||
if(buffer[startpoint-1]=='\n')
|
||||
count++;
|
||||
if (!pip)
|
||||
filelocation=lseek(fd,0,SEEK_CUR);
|
||||
if(count==units*direction)
|
||||
break;
|
||||
}
|
||||
if((count==units*direction) | pip)
|
||||
break;
|
||||
if(direction<0){
|
||||
filelocation = lseek(fd, -bytes_read, SEEK_CUR);
|
||||
if(filelocation==0)
|
||||
break;
|
||||
}
|
||||
}
|
||||
if(pip && (direction<0))
|
||||
bs++;
|
||||
bytes_read=bs-startpoint;
|
||||
memcpy(&buffer[0],&buffer[startpoint],bytes_read);
|
||||
|
||||
return 0;
|
||||
#define BYTES 0
|
||||
#define LINES 1
|
||||
|
||||
static char *tailbuf;
|
||||
static int taillen;
|
||||
static int newline;
|
||||
|
||||
void tailbuf_append(char *buf, int len)
|
||||
{
|
||||
tailbuf = xrealloc(tailbuf, taillen + len);
|
||||
memcpy(tailbuf + taillen, buf, len);
|
||||
taillen += len;
|
||||
}
|
||||
|
||||
void add_file(char *name)
|
||||
void tailbuf_trunc()
|
||||
{
|
||||
++n_files;
|
||||
files = xrealloc(files, n_files);
|
||||
files[n_files - 1] = (char *) xmalloc(strlen(name) + 1);
|
||||
strcpy(files[n_files - 1], name);
|
||||
char *s;
|
||||
s = memchr(tailbuf, '\n', taillen);
|
||||
memmove(tailbuf, s + 1, taillen - ((s + 1) - tailbuf));
|
||||
taillen -= (s + 1) - tailbuf;
|
||||
newline = 0;
|
||||
}
|
||||
|
||||
int tail_main(int argc, char **argv)
|
||||
{
|
||||
int show_headers = 1;
|
||||
int test;
|
||||
int opt;
|
||||
char follow=0;
|
||||
int sleep_int=1;
|
||||
int *fd;
|
||||
|
||||
opterr = 0;
|
||||
|
||||
while ((opt=getopt(argc,argv,"c:fhn:s:q:v")) >0) {
|
||||
int from_top = 0, units = LINES, count = 10, sleep_period = 1;
|
||||
int show_headers = 0, hide_headers = 0, follow = 0;
|
||||
int *fds, nfiles = 0, status = EXIT_SUCCESS, nread, nwrite, seen = 0;
|
||||
char *s, *start, *end, buf[BUFSIZ];
|
||||
int i, opt;
|
||||
|
||||
while ((opt = getopt(argc, argv, "c:fhn:q:s:v")) > 0) {
|
||||
switch (opt) {
|
||||
case 'f':
|
||||
follow = 1;
|
||||
break;
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
case 'q':
|
||||
show_headers = 0;
|
||||
break;
|
||||
case 's':
|
||||
sleep_int = atoi(optarg);
|
||||
if(sleep_int<1)
|
||||
sleep_int=1;
|
||||
break;
|
||||
case 'v':
|
||||
verbose = 1;
|
||||
break;
|
||||
case 'c':
|
||||
unit_type = BYTES;
|
||||
/* FALLS THROUGH */
|
||||
case 'c':
|
||||
units = BYTES;
|
||||
/* FALLS THROUGH */
|
||||
#endif
|
||||
case 'n':
|
||||
test = parse_number(optarg, tail_suffixes);
|
||||
if (test) {
|
||||
case 'n':
|
||||
count = parse_number(optarg, tail_suffixes);
|
||||
if (count < 0)
|
||||
count = -count;
|
||||
if (optarg[0] == '+')
|
||||
units = test;
|
||||
else
|
||||
units = -(test+1);
|
||||
} else
|
||||
usage(tail_usage);
|
||||
break;
|
||||
case 'f':
|
||||
follow = 1;
|
||||
break;
|
||||
default:
|
||||
usage(tail_usage);
|
||||
}
|
||||
}
|
||||
while (optind <= argc) {
|
||||
if(optind==argc) {
|
||||
if (n_files==0)
|
||||
add_file(STDIN);
|
||||
else
|
||||
from_top = 1;
|
||||
break;
|
||||
}else {
|
||||
if (!strcmp(argv[optind], "-")) {
|
||||
add_file(STDIN);
|
||||
} else {
|
||||
add_file(argv[optind]);
|
||||
}
|
||||
optind++;
|
||||
}
|
||||
}
|
||||
if(units==0)
|
||||
units=-11;
|
||||
if(units>0)
|
||||
units--;
|
||||
fd=xmalloc(sizeof(int)*n_files);
|
||||
if (n_files == 1)
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
if (!verbose)
|
||||
#endif
|
||||
show_headers = 0;
|
||||
buffer=xmalloc(BUFSIZ);
|
||||
for (test = 0; test < n_files; test++) {
|
||||
if (show_headers)
|
||||
printf("==> %s <==\n", files[test]);
|
||||
if (!strcmp(files[test], STDIN))
|
||||
fd[test] = 0;
|
||||
else
|
||||
fd[test] = open(files[test], O_RDONLY);
|
||||
if (fd[test] == -1)
|
||||
error_msg_and_die("Unable to open file %s.\n", files[test]);
|
||||
tail_stream(fd[test]);
|
||||
|
||||
bs=BUFSIZ;
|
||||
while (1) {
|
||||
if((filelocation>0 || pip)){
|
||||
write(1,buffer,bytes_read);
|
||||
}
|
||||
bytes_read = read(fd[test], buffer, bs);
|
||||
filelocation+=bytes_read;
|
||||
if (bytes_read <= 0) {
|
||||
case 'q':
|
||||
hide_headers = 1;
|
||||
break;
|
||||
}
|
||||
usleep(sleep_int * 1000);
|
||||
case 's':
|
||||
sleep_period = parse_number(optarg, null_suffixes);
|
||||
break;
|
||||
case 'v':
|
||||
show_headers = 1;
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
usage(tail_usage);
|
||||
}
|
||||
if(n_files>1)
|
||||
printf("\n");
|
||||
}
|
||||
while(1){
|
||||
for (test = 0; test < n_files; test++) {
|
||||
if(!follow){
|
||||
close(fd[test]);
|
||||
continue;
|
||||
|
||||
/* open all the files */
|
||||
fds = (int *)xmalloc(sizeof(int) * (argc - optind + 1));
|
||||
if (argc == optind) {
|
||||
fds[nfiles++] = STDIN_FILENO;
|
||||
argv[optind] = "standard input";
|
||||
} else {
|
||||
for (i = optind; i < argc; i++) {
|
||||
if (strcmp(argv[i], "-") == 0) {
|
||||
fds[nfiles++] = STDIN_FILENO;
|
||||
argv[i] = "standard input";
|
||||
} else if ((fds[nfiles++] = open(argv[i], O_RDONLY)) < 0) {
|
||||
perror_msg("%s", argv[i]);
|
||||
status = EXIT_FAILURE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
/* tail the files */
|
||||
if (!from_top && units == BYTES)
|
||||
tailbuf = xmalloc(count);
|
||||
#endif
|
||||
|
||||
for (i = 0; i < nfiles; i++) {
|
||||
if (fds[i] == -1)
|
||||
continue;
|
||||
seen = 0;
|
||||
if (show_headers || (!hide_headers && nfiles > 1))
|
||||
printf("%s==> %s <==\n", i == 0 ? "" : "\n", argv[optind + i]);
|
||||
while ((nread = safe_read(fds[i], buf, sizeof(buf))) > 0) {
|
||||
if (from_top) {
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
if (units == BYTES) {
|
||||
if (count - 1 <= seen)
|
||||
nwrite = nread;
|
||||
else if (count - 1 <= seen + nread)
|
||||
nwrite = nread + seen - (count - 1);
|
||||
else
|
||||
nwrite = 0;
|
||||
seen += nread;
|
||||
} else {
|
||||
#else
|
||||
{
|
||||
#endif
|
||||
if (count - 1 <= seen)
|
||||
nwrite = nread;
|
||||
else {
|
||||
nwrite = 0;
|
||||
for (s = memchr(buf, '\n', nread); s != NULL;
|
||||
s = memchr(s+1, '\n', nread - (s + 1 - buf))) {
|
||||
if (count - 1 <= ++seen) {
|
||||
nwrite = nread - (s + 1 - buf);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (full_write(STDOUT_FILENO, buf + nread - nwrite,
|
||||
nwrite) < 0) {
|
||||
perror_msg("write");
|
||||
status = EXIT_FAILURE;
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
sleep(sleep_int);
|
||||
bytes_read = read(fd[test], buffer, bs);
|
||||
if(bytes_read>0) {
|
||||
if (show_headers)
|
||||
printf("==> %s <==\n", files[test]);
|
||||
write(1,buffer,bytes_read);
|
||||
if(n_files>1)
|
||||
printf("\n");
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
if (units == BYTES) {
|
||||
if (nread < count) {
|
||||
memmove(tailbuf, tailbuf + nread, count - nread);
|
||||
memcpy(tailbuf + count - nread, buf, nread);
|
||||
} else {
|
||||
memcpy(tailbuf, buf + nread - count, count);
|
||||
}
|
||||
seen += nread;
|
||||
} else {
|
||||
#else
|
||||
{
|
||||
#endif
|
||||
for (start = buf, end = memchr(buf, '\n', nread);
|
||||
end != NULL; start = end+1,
|
||||
end = memchr(start, '\n', nread - (start - buf))) {
|
||||
if (newline && count <= seen)
|
||||
tailbuf_trunc();
|
||||
tailbuf_append(start, end - start + 1);
|
||||
seen++;
|
||||
newline = 1;
|
||||
}
|
||||
if (newline && count <= seen && nread - (start - buf) > 0)
|
||||
tailbuf_trunc();
|
||||
tailbuf_append(start, nread - (start - buf));
|
||||
}
|
||||
}
|
||||
}
|
||||
if(!follow)
|
||||
break;
|
||||
}
|
||||
if (fd)
|
||||
free(fd);
|
||||
if (buffer)
|
||||
free(buffer);
|
||||
if(files)
|
||||
free(files);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
Local Variables:
|
||||
c-file-style: "linux"
|
||||
c-basic-offset: 4
|
||||
tab-width: 4
|
||||
End:
|
||||
*/
|
||||
if (nread < 0) {
|
||||
perror_msg("read");
|
||||
status = EXIT_FAILURE;
|
||||
}
|
||||
|
||||
#ifndef BB_FEATURE_SIMPLE_TAIL
|
||||
if (!from_top && units == BYTES) {
|
||||
if (count < seen)
|
||||
seen = count;
|
||||
if (full_write(STDOUT_FILENO, tailbuf + count - seen, seen) < 0) {
|
||||
perror_msg("write");
|
||||
status = EXIT_FAILURE;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
if (!from_top && units == LINES) {
|
||||
if (full_write(STDOUT_FILENO, tailbuf, taillen) < 0) {
|
||||
perror_msg("write");
|
||||
status = EXIT_FAILURE;
|
||||
}
|
||||
}
|
||||
|
||||
taillen = 0;
|
||||
}
|
||||
|
||||
while (follow) {
|
||||
sleep(sleep_period);
|
||||
|
||||
for (i = 0; i < nfiles; i++) {
|
||||
if (fds[i] == -1)
|
||||
continue;
|
||||
|
||||
if ((nread = safe_read(fds[i], buf, sizeof(buf))) > 0) {
|
||||
if (show_headers || (!hide_headers && nfiles > 1))
|
||||
printf("\n==> %s <==\n", argv[optind + i]);
|
||||
|
||||
do {
|
||||
full_write(STDOUT_FILENO, buf, nread);
|
||||
} while ((nread = safe_read(fds[i], buf, sizeof(buf))) > 0);
|
||||
}
|
||||
|
||||
if (nread < 0) {
|
||||
perror_msg("read");
|
||||
status = EXIT_FAILURE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user