imported original firmware WRT54GL_v4.30.11_11_US

1 files changed, 251 insertions, 0 deletions

diff --git a/release/src/router/busybox/tail.c b/release/src/router/busybox/tail.c
new file mode 100644
index 00000000..90cc2a6e
--- /dev/null
+++ b/release/src/router/busybox/tail.c
@@ -0,0 +1,251 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * 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 <fcntl.h>
+#include <getopt.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include "busybox.h"
+
+static const struct suffix_mult tail_suffixes[] = {
+	{ "b", 512 },
+	{ "k", 1024 },
+	{ "m", 1048576 },
+	{ NULL, 0 }
+};
+
+static const int BYTES = 0;
+static const int LINES = 1;
+
+static char *tailbuf;
+static int taillen;
+static int newline;
+
+static void tailbuf_append(char *buf, int len)
+{
+	tailbuf = xrealloc(tailbuf, taillen + len);
+	memcpy(tailbuf + taillen, buf, len);
+	taillen += len;
+}
+
+static void tailbuf_trunc()
+{
+	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 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;
+#ifdef BB_FEATURE_FANCY_TAIL
+			case 'c':
+				units = BYTES;
+				/* FALLS THROUGH */
+#endif
+			case 'n':
+				count = parse_number(optarg, tail_suffixes);
+				if (count < 0)
+					count = -count;
+				if (optarg[0] == '+')
+					from_top = 1;
+				break;
+#ifdef BB_FEATURE_FANCY_TAIL
+			case 'q':
+				hide_headers = 1;
+				break;
+			case 's':
+				sleep_period = parse_number(optarg, 0);
+				break;
+			case 'v':
+				show_headers = 1;
+				break;
+#endif
+			default:
+				show_usage();
+		}
+	}
+
+	/* 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;
+			}
+		}
+	}
+	
+#ifdef BB_FEATURE_FANCY_TAIL
+	/* tail the files */
+	if (!from_top && units == BYTES)
+		tailbuf = xmalloc(count);
+#endif
+
+	for (i = 0; i < nfiles; i++) {
+		if (fds[i] == -1)
+			continue;
+		if (!count) {
+			lseek(fds[i], 0, SEEK_END);
+			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) {
+#ifdef BB_FEATURE_FANCY_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 {
+#ifdef BB_FEATURE_FANCY_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 (nread < 0) {
+			perror_msg("read");
+			status = EXIT_FAILURE;
+		}
+
+#ifdef BB_FEATURE_FANCY_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;
+}