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header file usage before the 0.49 release. To fix it, I had to move the '#include "busybox.h"' to the end of the list of #include files. -Erik
248 lines
5.7 KiB
C
248 lines
5.7 KiB
C
/* vi: set sw=4 ts=4: */
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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 <fcntl.h>
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#include <getopt.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "busybox.h"
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static const struct suffix_mult tail_suffixes[] = {
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{ "b", 512 },
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{ "k", 1024 },
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{ "m", 1048576 },
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{ NULL, 0 }
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};
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static const int BYTES = 0;
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static const int 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 tailbuf_trunc()
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{
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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 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 '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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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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from_top = 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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hide_headers = 1;
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break;
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case 's':
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sleep_period = parse_number(optarg, 0);
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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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show_usage();
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}
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}
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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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#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 (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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