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This commit is contained in:
Eric Andersen 1999-12-08 23:19:36 +00:00
parent 2285f367e2
commit abc0f4f8f9
20 changed files with 2188 additions and 75 deletions
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9
Changelog
View File

@ -1,9 +1,14 @@
0.38
0.39
* New Apps: ping and hostname contributed by Randolph Chung
<tausq@debian.org>
<tausq@debian.org>. 2 items off the TODO list!
* I wrote free (just calls "cat /proc/meminfo").
* on reboot, init called 'umount -a -n', which caused errors
when BB_MTAB was not enabled. Changed to 'umount -a',
which does the right thing.
* init will now try to run /sbin/getty if it is present (for easy
integration with the about-to-be-released tinylogin.)
* kill now behaves itself properly, added 'kill -l' to list signals
* Began to add tail, butit doesn't work yet.
-Erik Andrsen

1
TODO
View File

@ -19,7 +19,6 @@ around to it some time. If you have any good ideas, please let me know.
* rdate
* hwclock
* login/getty
* free
* killall
* tee
* stty

10
applets/busybox.c
View File

@ -27,6 +27,9 @@ static const struct Applet applets[] = {
#ifdef BB_CLEAR //usr/bin
{"clear", clear_main},
#endif
#ifdef BB_CHVT //usr/bin
{"chvt", chvt_main},
#endif
#ifdef BB_CP //bin
{"cp", cp_main},
#endif
@ -51,8 +54,8 @@ static const struct Applet applets[] = {
#ifdef BB_FIND //usr/bin
{"find", find_main},
#endif
#ifdef BB_CHVT //usr/bin
{"chvt", chvt_main},
#ifdef BB_FREE //usr/bin
{"free", free_main},
#endif
#ifdef BB_DEALLOCVT //usr/bin
{"deallocvt", deallocvt_main},
@ -170,6 +173,9 @@ static const struct Applet applets[] = {
{"swapon", swap_on_off_main},
{"swapoff", swap_on_off_main},
#endif
#ifdef BB_TAIL //usr/bin
{"tail", tail_main},
#endif
#ifdef BB_TAR //bin
{"tar", tar_main},
#endif

10
busybox.c
View File

@ -27,6 +27,9 @@ static const struct Applet applets[] = {
#ifdef BB_CLEAR //usr/bin
{"clear", clear_main},
#endif
#ifdef BB_CHVT //usr/bin
{"chvt", chvt_main},
#endif
#ifdef BB_CP //bin
{"cp", cp_main},
#endif
@ -51,8 +54,8 @@ static const struct Applet applets[] = {
#ifdef BB_FIND //usr/bin
{"find", find_main},
#endif
#ifdef BB_CHVT //usr/bin
{"chvt", chvt_main},
#ifdef BB_FREE //usr/bin
{"free", free_main},
#endif
#ifdef BB_DEALLOCVT //usr/bin
{"deallocvt", deallocvt_main},
@ -170,6 +173,9 @@ static const struct Applet applets[] = {
{"swapon", swap_on_off_main},
{"swapoff", swap_on_off_main},
#endif
#ifdef BB_TAIL //usr/bin
{"tail", tail_main},
#endif
#ifdef BB_TAR //bin
{"tar", tar_main},
#endif

4
busybox.def.h
View File

@ -16,6 +16,7 @@
//#define BB_DUTMP
//#define BB_FDFLUSH
#define BB_FIND
#define BB_FREE
#define BB_FSCK_MINIX
#define BB_MKFS_MINIX
#define BB_CHVT
@ -58,6 +59,7 @@
#define BB_SYNC
#define BB_SYSLOGD
#define BB_TAR
#define BB_TAIL
#define BB_TOUCH
#define BB_TRUE_FALSE
#define BB_UMOUNT
@ -76,7 +78,7 @@
// pretty/useful).
//
//
// enable a second console on VT2 in init
// enable a second console on TTY2 in init
#define BB_FEATURE_INIT_SECOND_CONSOLE
// enable features that use the /proc filesystem
#define BB_FEATURE_USE_PROCFS

5
cat.c
View File

@ -46,10 +46,9 @@ extern int cat_main(int argc, char **argv)
usage ("cat [file ...]\n");
}
argc--;
argv++;
while (argc-- > 0) {
file = fopen(*(argv++), "r");
while (argc-- > 0 && *(argv++) != '\0' && strlen(*argv) ) {
file = fopen(*argv, "r");
if (file == NULL) {
perror(*argv);
exit(FALSE);

5
coreutils/cat.c
View File

@ -46,10 +46,9 @@ extern int cat_main(int argc, char **argv)
usage ("cat [file ...]\n");
}
argc--;
argv++;
while (argc-- > 0) {
file = fopen(*(argv++), "r");
while (argc-- > 0 && *(argv++) != '\0' && strlen(*argv) ) {
file = fopen(*argv, "r");
if (file == NULL) {
perror(*argv);
exit(FALSE);

955
coreutils/tail.c Normal file
View File

@ -0,0 +1,955 @@
/* 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. */
/* Can display any amount of data, unlike the Unix version, which uses
a fixed size buffer and therefore can only deliver a limited number
of lines.
Options:
-b Tail by N 512-byte blocks.
-c, --bytes=N[bkm] Tail by N bytes
[or 512-byte blocks, kilobytes, or megabytes].
-f, --follow Loop forever trying to read more characters at the
end of the file, on the assumption that the file
is growing. Ignored if reading from a pipe.
-n, --lines=N Tail by N lines.
-q, --quiet, --silent Never print filename headers.
-v, --verbose Always print filename headers.
If a number (N) starts with a `+', begin printing with the Nth item
from the start of each file, instead of from the end.
Reads from standard input if no files are given or when a filename of
``-'' is encountered.
By default, filename headers are printed only more than one file
is given.
By default, prints the last 10 lines (tail -n 10).
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>. */
#include "internal.h"
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
/* Disable assertions. Some systems have broken assert macros. */
#define NDEBUG 1
static void error(int i, int errnum, char* fmt, const char *msg)
{
fprintf(stderr, fmt, msg);
perror( errnum);
exit(i);
}
#define XWRITE(fd, buffer, n_bytes) \
do \
{ \
assert ((fd) == 1); \
assert ((n_bytes) >= 0); \
if (n_bytes > 0 && fwrite ((buffer), 1, (n_bytes), stdout) == 0) \
error (EXIT_FAILURE, errno, "write error", NULL); \
} \
while (0)
/* Number of items to tail. */
#define DEFAULT_N_LINES 10
/* Size of atomic reads. */
#ifndef BUFSIZ
#define BUFSIZ (512 * 8)
#endif
/* If nonzero, interpret the numeric argument as the number of lines.
Otherwise, interpret it as the number of bytes. */
static int count_lines;
/* If nonzero, read from the end of one file until killed. */
static int forever;
/* If nonzero, read from the end of multiple files until killed. */
static int forever_multiple;
/* Array of file descriptors if forever_multiple is 1. */
static int *file_descs;
/* Array of file sizes if forever_multiple is 1. */
static off_t *file_sizes;
/* If nonzero, count from start of file instead of end. */
static int from_start;
/* If nonzero, print filename headers. */
static int print_headers;
/* When to print the filename banners. */
enum header_mode
{
multiple_files, always, never
};
char *xmalloc ();
int safe_read ();
/* The name this program was run with. */
char *program_name;
/* Nonzero if we have ever read standard input. */
static int have_read_stdin;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output then exit. */
static int show_version;
static const char tail_usage[] =
"tail [OPTION]... [FILE]...\n\
Print last 10 lines of each FILE to standard output.\n\
With more than one FILE, precede each with a header giving the file name.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
-c, --bytes=N output the last N bytes\n\
-f, --follow output appended data as the file grows\n\
-n, --lines=N output the last N lines, instead of last 10\n\
-q, --quiet, --silent never output headers giving file names\n\
-v, --verbose always output headers giving file names\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
If the first character of N (the number of bytes or lines) is a `+',\n\
print beginning with the Nth item from the start of each file, otherwise,\n\
print the last N items in the file. N may have a multiplier suffix:\n\
b for 512, k for 1024, m for 1048576 (1 Meg). A first OPTION of -VALUE\n\
or +VALUE is treated like -n VALUE or -n +VALUE unless VALUE has one of\n\
the [bkm] suffix multipliers, in which case it is treated like -c VALUE\n\
or -c +VALUE.\n";
static void
write_header (const char *filename, const char *comment)
{
static int first_file = 1;
printf ("%s==> %s%s%s <==\n", (first_file ? "" : "\n"), filename,
(comment ? ": " : ""),
(comment ? comment : ""));
first_file = 0;
}
/* Print the last N_LINES lines from the end of file FD.
Go backward through the file, reading `BUFSIZ' bytes at a time (except
probably the first), until we hit the start of the file or have
read NUMBER newlines.
POS starts out as the length of the file (the offset of the last
byte of the file + 1).
Return 0 if successful, 1 if an error occurred. */
static int
file_lines (const char *filename, int fd, long int n_lines, off_t pos)
{
char buffer[BUFSIZ];
int bytes_read;
int i; /* Index into `buffer' for scanning. */
if (n_lines == 0)
return 0;
/* Set `bytes_read' to the size of the last, probably partial, buffer;
0 < `bytes_read' <= `BUFSIZ'. */
bytes_read = pos % BUFSIZ;
if (bytes_read == 0)
bytes_read = BUFSIZ;
/* Make `pos' a multiple of `BUFSIZ' (0 if the file is short), so that all
reads will be on block boundaries, which might increase efficiency. */
pos -= bytes_read;
lseek (fd, pos, SEEK_SET);
bytes_read = safe_read (fd, buffer, bytes_read);
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
/* Count the incomplete line on files that don't end with a newline. */
if (bytes_read && buffer[bytes_read - 1] != '\n')
--n_lines;
do
{
/* Scan backward, counting the newlines in this bufferfull. */
for (i = bytes_read - 1; i >= 0; i--)
{
/* Have we counted the requested number of newlines yet? */
if (buffer[i] == '\n' && n_lines-- == 0)
{
/* If this newline wasn't the last character in the buffer,
print the text after it. */
if (i != bytes_read - 1)
XWRITE (STDOUT_FILENO, &buffer[i + 1], bytes_read - (i + 1));
return 0;
}
}
/* Not enough newlines in that bufferfull. */
if (pos == 0)
{
/* Not enough lines in the file; print the entire file. */
lseek (fd, (off_t) 0, SEEK_SET);
return 0;
}
pos -= BUFSIZ;
lseek (fd, pos, SEEK_SET);
}
while ((bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0);
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
return 0;
}
/* Print the last N_LINES lines from the end of the standard input,
open for reading as pipe FD.
Buffer the text as a linked list of LBUFFERs, adding them as needed.
Return 0 if successful, 1 if an error occured. */
static int
pipe_lines (const char *filename, int fd, long int n_lines)
{
struct linebuffer
{
int nbytes, nlines;
char buffer[BUFSIZ];
struct linebuffer *next;
};
typedef struct linebuffer LBUFFER;
LBUFFER *first, *last, *tmp;
int i; /* Index into buffers. */
int total_lines = 0; /* Total number of newlines in all buffers. */
int errors = 0;
first = last = (LBUFFER *) xmalloc (sizeof (LBUFFER));
first->nbytes = first->nlines = 0;
first->next = NULL;
tmp = (LBUFFER *) xmalloc (sizeof (LBUFFER));
/* Input is always read into a fresh buffer. */
while ((tmp->nbytes = safe_read (fd, tmp->buffer, BUFSIZ)) > 0)
{
tmp->nlines = 0;
tmp->next = NULL;
/* Count the number of newlines just read. */
for (i = 0; i < tmp->nbytes; i++)
if (tmp->buffer[i] == '\n')
++tmp->nlines;
total_lines += tmp->nlines;
/* If there is enough room in the last buffer read, just append the new
one to it. This is because when reading from a pipe, `nbytes' can
often be very small. */
if (tmp->nbytes + last->nbytes < BUFSIZ)
{
memcpy (&last->buffer[last->nbytes], tmp->buffer, tmp->nbytes);
last->nbytes += tmp->nbytes;
last->nlines += tmp->nlines;
}
else
{
/* If there's not enough room, link the new buffer onto the end of
the list, then either free up the oldest buffer for the next
read if that would leave enough lines, or else malloc a new one.
Some compaction mechanism is possible but probably not
worthwhile. */
last = last->next = tmp;
if (total_lines - first->nlines > n_lines)
{
tmp = first;
total_lines -= first->nlines;
first = first->next;
}
else
tmp = (LBUFFER *) xmalloc (sizeof (LBUFFER));
}
}
if (tmp->nbytes == -1)
{
error (0, errno, "%s", filename);
errors = 1;
free ((char *) tmp);
goto free_lbuffers;
}
free ((char *) tmp);
/* This prevents a core dump when the pipe contains no newlines. */
if (n_lines == 0)
goto free_lbuffers;
/* Count the incomplete line on files that don't end with a newline. */
if (last->buffer[last->nbytes - 1] != '\n')
{
++last->nlines;
++total_lines;
}
/* Run through the list, printing lines. First, skip over unneeded
buffers. */
for (tmp = first; total_lines - tmp->nlines > n_lines; tmp = tmp->next)
total_lines -= tmp->nlines;
/* Find the correct beginning, then print the rest of the file. */
if (total_lines > n_lines)
{
char *cp;
/* Skip `total_lines' - `n_lines' newlines. We made sure that
`total_lines' - `n_lines' <= `tmp->nlines'. */
cp = tmp->buffer;
for (i = total_lines - n_lines; i; --i)
while (*cp++ != '\n')
/* Do nothing. */ ;
i = cp - tmp->buffer;
}
else
i = 0;
XWRITE (STDOUT_FILENO, &tmp->buffer[i], tmp->nbytes - i);
for (tmp = tmp->next; tmp; tmp = tmp->next)
XWRITE (STDOUT_FILENO, tmp->buffer, tmp->nbytes);
free_lbuffers:
while (first)
{
tmp = first->next;
free ((char *) first);
first = tmp;
}
return errors;
}
/* Print the last N_BYTES characters from the end of pipe FD.
This is a stripped down version of pipe_lines.
Return 0 if successful, 1 if an error occurred. */
static int
pipe_bytes (const char *filename, int fd, off_t n_bytes)
{
struct charbuffer
{
int nbytes;
char buffer[BUFSIZ];
struct charbuffer *next;
};
typedef struct charbuffer CBUFFER;
CBUFFER *first, *last, *tmp;
int i; /* Index into buffers. */
int total_bytes = 0; /* Total characters in all buffers. */
int errors = 0;
first = last = (CBUFFER *) xmalloc (sizeof (CBUFFER));
first->nbytes = 0;
first->next = NULL;
tmp = (CBUFFER *) xmalloc (sizeof (CBUFFER));
/* Input is always read into a fresh buffer. */
while ((tmp->nbytes = safe_read (fd, tmp->buffer, BUFSIZ)) > 0)
{
tmp->next = NULL;
total_bytes += tmp->nbytes;
/* If there is enough room in the last buffer read, just append the new
one to it. This is because when reading from a pipe, `nbytes' can
often be very small. */
if (tmp->nbytes + last->nbytes < BUFSIZ)
{
memcpy (&last->buffer[last->nbytes], tmp->buffer, tmp->nbytes);
last->nbytes += tmp->nbytes;
}
else
{
/* If there's not enough room, link the new buffer onto the end of
the list, then either free up the oldest buffer for the next
read if that would leave enough characters, or else malloc a new
one. Some compaction mechanism is possible but probably not
worthwhile. */
last = last->next = tmp;
if (total_bytes - first->nbytes > n_bytes)
{
tmp = first;
total_bytes -= first->nbytes;
first = first->next;
}
else
{
tmp = (CBUFFER *) xmalloc (sizeof (CBUFFER));
}
}
}
if (tmp->nbytes == -1)
{
error (0, errno, "%s", filename);
errors = 1;
free ((char *) tmp);
goto free_cbuffers;
}
free ((char *) tmp);
/* Run through the list, printing characters. First, skip over unneeded
buffers. */
for (tmp = first; total_bytes - tmp->nbytes > n_bytes; tmp = tmp->next)
total_bytes -= tmp->nbytes;
/* Find the correct beginning, then print the rest of the file.
We made sure that `total_bytes' - `n_bytes' <= `tmp->nbytes'. */
if (total_bytes > n_bytes)
i = total_bytes - n_bytes;
else
i = 0;
XWRITE (STDOUT_FILENO, &tmp->buffer[i], tmp->nbytes - i);
for (tmp = tmp->next; tmp; tmp = tmp->next)
XWRITE (STDOUT_FILENO, tmp->buffer, tmp->nbytes);
free_cbuffers:
while (first)
{
tmp = first->next;
free ((char *) first);
first = tmp;
}
return errors;
}
/* Skip N_BYTES characters from the start of pipe FD, and print
any extra characters that were read beyond that.
Return 1 on error, 0 if ok. */
static int
start_bytes (const char *filename, int fd, off_t n_bytes)
{
char buffer[BUFSIZ];
int bytes_read = 0;
while (n_bytes > 0 && (bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
n_bytes -= bytes_read;
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
else if (n_bytes < 0)
XWRITE (STDOUT_FILENO, &buffer[bytes_read + n_bytes], -n_bytes);
return 0;
}
/* Skip N_LINES lines at the start of file or pipe FD, and print
any extra characters that were read beyond that.
Return 1 on error, 0 if ok. */
static int
start_lines (const char *filename, int fd, long int n_lines)
{
char buffer[BUFSIZ];
int bytes_read = 0;
int bytes_to_skip = 0;
while (n_lines && (bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
{
bytes_to_skip = 0;
while (bytes_to_skip < bytes_read)
if (buffer[bytes_to_skip++] == '\n' && --n_lines == 0)
break;
}
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
else if (bytes_to_skip < bytes_read)
{
XWRITE (STDOUT_FILENO, &buffer[bytes_to_skip],
bytes_read - bytes_to_skip);
}
return 0;
}
/* Display file FILENAME from the current position in FD to the end.
If `forever' is nonzero, keep reading from the end of the file
until killed. Return the number of bytes read from the file. */
static long
dump_remainder (const char *filename, int fd)
{
char buffer[BUFSIZ];
int bytes_read;
long total;
total = 0;
output:
while ((bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
{
XWRITE (STDOUT_FILENO, buffer, bytes_read);
total += bytes_read;
}
if (bytes_read == -1)
error (EXIT_FAILURE, errno, "%s", filename);
if (forever)
{
fflush (stdout);
sleep (1);
goto output;
}
else
{
if (forever_multiple)
fflush (stdout);
}
return total;
}
/* Tail NFILES (>1) files forever until killed. The file names are in
NAMES. The open file descriptors are in `file_descs', and the size
at which we stopped tailing them is in `file_sizes'. We loop over
each of them, doing an fstat to see if they have changed size. If
none of them have changed size in one iteration, we sleep for a
second and try again. We do this until the user interrupts us. */
static void
tail_forever (char **names, int nfiles)
{
int last;
last = -1;
while (1)
{
int i;
int changed;
changed = 0;
for (i = 0; i < nfiles; i++)
{
struct stat stats;
if (file_descs[i] < 0)
continue;
if (fstat (file_descs[i], &stats) < 0)
{
error (0, errno, "%s", names[i]);
file_descs[i] = -1;
continue;
}
if (stats.st_size == file_sizes[i])
continue;
/* This file has changed size. Print out what we can, and
then keep looping. */
changed = 1;
if (stats.st_size < file_sizes[i])
{
write_header (names[i], "file truncated");
last = i;
lseek (file_descs[i], stats.st_size, SEEK_SET);
file_sizes[i] = stats.st_size;
continue;
}
if (i != last)
{
if (print_headers)
write_header (names[i], NULL);
last = i;
}
file_sizes[i] += dump_remainder (names[i], file_descs[i]);
}
/* If none of the files changed size, sleep. */
if (! changed)
sleep (1);
}
}
/* Output the last N_BYTES bytes of file FILENAME open for reading in FD.
Return 0 if successful, 1 if an error occurred. */
static int
tail_bytes (const char *filename, int fd, off_t n_bytes)
{
struct stat stats;
/* FIXME: resolve this like in dd.c. */
/* Use fstat instead of checking for errno == ESPIPE because
lseek doesn't work on some special files but doesn't return an
error, either. */
if (fstat (fd, &stats))
{
error (0, errno, "%s", filename);
return 1;
}
if (from_start)
{
if (S_ISREG (stats.st_mode))
lseek (fd, n_bytes, SEEK_CUR);
else if (start_bytes (filename, fd, n_bytes))
return 1;
dump_remainder (filename, fd);
}
else
{
if (S_ISREG (stats.st_mode))
{
off_t current_pos, end_pos;
size_t bytes_remaining;
if ((current_pos = lseek (fd, (off_t) 0, SEEK_CUR)) != -1
&& (end_pos = lseek (fd, (off_t) 0, SEEK_END)) != -1)
{
off_t diff;
/* Be careful here. The current position may actually be
beyond the end of the file. */
bytes_remaining = (diff = end_pos - current_pos) < 0 ? 0 : diff;
}
else
{
error (0, errno, "%s", filename);
return 1;
}
if (bytes_remaining <= n_bytes)
{
/* From the current position to end of file, there are no
more bytes than have been requested. So reposition the
file pointer to the incoming current position and print
everything after that. */
lseek (fd, current_pos, SEEK_SET);
}
else
{
/* There are more bytes remaining than were requested.
Back up. */
lseek (fd, -n_bytes, SEEK_END);
}
dump_remainder (filename, fd);
}
else
return pipe_bytes (filename, fd, n_bytes);
}
return 0;
}
/* Output the last N_LINES lines of file FILENAME open for reading in FD.
Return 0 if successful, 1 if an error occurred. */
static int
tail_lines (const char *filename, int fd, long int n_lines)
{
struct stat stats;
off_t length;
if (fstat (fd, &stats))
{
error (0, errno, "%s", filename);
return 1;
}
if (from_start)
{
if (start_lines (filename, fd, n_lines))
return 1;
dump_remainder (filename, fd);
}
else
{
/* Use file_lines only if FD refers to a regular file with
its file pointer positioned at beginning of file. */
/* FIXME: adding the lseek conjunct is a kludge.
Once there's a reasonable test suite, fix the true culprit:
file_lines. file_lines shouldn't presume that the input
file pointer is initially positioned to beginning of file. */
if (S_ISREG (stats.st_mode)
&& lseek (fd, (off_t) 0, SEEK_CUR) == (off_t) 0)
{
length = lseek (fd, (off_t) 0, SEEK_END);
if (length != 0 && file_lines (filename, fd, n_lines, length))
return 1;
dump_remainder (filename, fd);
}
else
return pipe_lines (filename, fd, n_lines);
}
return 0;
}
/* Display the last N_UNITS units of file FILENAME, open for reading
in FD.
Return 0 if successful, 1 if an error occurred. */
static int
tail (const char *filename, int fd, off_t n_units)
{
if (count_lines)
return tail_lines (filename, fd, (long) n_units);
else
return tail_bytes (filename, fd, n_units);
}
/* Display the last N_UNITS units of file FILENAME.
"-" for FILENAME means the standard input.
FILENUM is this file's index in the list of files the user gave.
Return 0 if successful, 1 if an error occurred. */
static int
tail_file (const char *filename, off_t n_units, int filenum)
{
int fd, errors;
struct stat stats;
if (!strcmp (filename, "-")
{
have_read_stdin = 1;
filename = "standard input";
if (print_headers)
write_header (filename, NULL);
errors = tail (filename, 0, n_units);
if (forever_multiple)
{
if (fstat (0, &stats) < 0)
{
error (0, errno, "standard input");
errors = 1;
}
else if (!S_ISREG (stats.st_mode))
{
error (0, 0,
"standard input: cannot follow end of non-regular file");
errors = 1;
}
if (errors)
file_descs[filenum] = -1;
else
{
file_descs[filenum] = 0;
file_sizes[filenum] = stats.st_size;
}
}
}
else
{
/* Not standard input. */
fd = open (filename, O_RDONLY);
if (fd == -1)
{
if (forever_multiple)
file_descs[filenum] = -1;
error (0, errno, "%s", filename);
errors = 1;
}
else
{
if (print_headers)
write_header (filename, NULL);
errors = tail (filename, fd, n_units);
if (forever_multiple)
{
if (fstat (fd, &stats) < 0)
{
error (0, errno, "%s", filename);
errors = 1;
}
else if (!S_ISREG (stats.st_mode))
{
error (0, 0, "%s: cannot follow end of non-regular file",
filename);
errors = 1;
}
if (errors)
{
close (fd);
file_descs[filenum] = -1;
}
else
{
file_descs[filenum] = fd;
file_sizes[filenum] = stats.st_size;
}
}
else
{
if (close (fd))
{
error (0, errno, "%s", filename);
errors = 1;
}
}
}
}
return errors;
}
extern int
tai_main (int argc, char **argv)
{
enum header_mode header_mode = multiple_files;
int exit_status = 0;
/* If from_start, the number of items to skip before printing; otherwise,
the number of items at the end of the file to print. Initially, -1
means the value has not been set. */
off_t n_units = -1;
long int tmp_long;
int c; /* Option character. */
int n_files;
char **file;
program_name = argv[0];
have_read_stdin = 0;
count_lines = 1;
forever = forever_multiple = from_start = print_headers = 0;
if (argc > 1
&& ((argv[1][0] == '-' && ISDIGIT (argv[1][1]))
|| (argv[1][0] == '+' && (ISDIGIT (argv[1][1])
|| argv[1][1] == 0))))
{
/* Old option syntax: a dash or plus, one or more digits (zero digits
are acceptable with a plus), and one or more option letters. */
if (argv[1][0] == '+')
from_start = 1;
if (argv[1][1] != '\0')
{
strtol_error s_err;
char *p;
s_err = xstrtol (++argv[1], &p, 0, &tmp_long, "bkm");
n_units = tmp_long;
if (s_err == LONGINT_OVERFLOW)
{
STRTOL_FATAL_ERROR (argv[1], "argument", s_err);
}
/* If a [bkm] suffix was given then count bytes, not lines. */
if (p[-1] == 'b' || p[-1] == 'k' || p[-1] == 'm')
count_lines = 0;
/* Parse any appended option letters. */
while (*p)
{
switch (*p)
{
case 'c':
/* Interpret N_UNITS as # of bytes. */
count_lines = 0;
break;
case 'f':
forever = 1;
break;
case 'l':
count_lines = 1;
break;
case 'q':
header_mode = never;
break;
case 'v':
header_mode = always;
break;
default:
error (0, 0, "unrecognized option '%c'", *p);
usage (tail_usage);
}
++p;
}
}
/* Make the options we just parsed invisible to getopt. */
argv[1] = argv[0];
argv++;
argc--;
}
if (show_version)
{
printf ("tail - %s\n", PACKAGE_VERSION);
exit (EXIT_SUCCESS);
}
if (show_help)
usage (tail_usage);
if (n_units == -1)
n_units = DEFAULT_N_LINES;
/* To start printing with item N_UNITS from the start of the file, skip
N_UNITS - 1 items. `tail +0' is actually meaningless, but for Unix
compatibility it's treated the same as `tail +1'. */
if (from_start)
{
if (n_units)
--n_units;
}
n_files = argc - optind;
file = argv + optind;
if (n_files > 1 && forever)
{
forever_multiple = 1;
forever = 0;
file_descs = (int *) xmalloc (n_files * sizeof (int));
file_sizes = (off_t *) xmalloc (n_files * sizeof (off_t));
}
if (header_mode == always
|| (header_mode == multiple_files && n_files > 1))
print_headers = 1;
if (n_files == 0)
{
exit_status |= tail_file ("-", n_units, 0);
}
else
{
int i;
for (i = 0; i < n_files; i++)
exit_status |= tail_file (file[i], n_units, i);
if (forever_multiple)
tail_forever (file, n_files);
}
if (have_read_stdin && close (0) < 0)
error (EXIT_FAILURE, errno, "-");
if (fclose (stdout) == EOF)
error (EXIT_FAILURE, errno, "write error");
exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}

35
free.c Normal file
View File

@ -0,0 +1,35 @@
/*
* Mini free implementation for busybox
*
* Copyright (C) 1999 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* 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 "internal.h"
#include <stdio.h>
#if ! defined BB_FEATURE_USE_PROCFS
#error Sorry, I depend on the /proc filesystem right now.
#endif
extern int free_main(int argc, char **argv)
{
char* cmd[] = { "cat", "/proc/meminfo", "\0" };
exit(cat_main( 3, cmd));
}

2
hostname.c
View File

@ -1,5 +1,5 @@
/*
* $Id: hostname.c,v 1.3 1999/12/08 04:23:30 andersen Exp $
* $Id: hostname.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>

2
internal.h
View File

@ -70,6 +70,7 @@ extern int fdflush_main(int argc, char **argv);
extern int fsck_minix_main(int argc, char **argv);
extern int mkfs_minix_main(int argc, char **argv);
extern int find_main(int argc, char** argv);
extern int free_main(int argc, char** argv);
extern int grep_main(int argc, char** argv);
extern int halt_main(int argc, char** argv);
extern int hostname_main(int argc, char** argv);
@ -109,6 +110,7 @@ extern int sync_main(int argc, char** argv);
extern int syslogd_main(int argc, char **argv);
extern int logger_main(int argc, char **argv);
extern int tar_main(int argc, char** argv);
extern int tail_main(int argc, char** argv);
extern int touch_main(int argc, char** argv);
extern int tput_main(int argc, char** argv);
extern int true_main(int argc, char** argv);

72
kill.c
View File

@ -26,8 +26,14 @@
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <sys/stat.h>
#include <unistd.h>
static const char* kill_usage = "kill [-signal] process-id [process-id ...]\n\n"
"Send a signal (default is SIGTERM) to the specified process(es).\n\n"
"Options:\n"
"\t-l\tList all signal names and numbers.\n\n";
const char kill_usage[] = "kill [-signal] process-id [process-id ...]\n";
struct signal_name {
const char *name;
@ -115,21 +121,53 @@ extern int kill_main (int argc, char **argv)
{
int sig = SIGTERM;
if ( argc < 2 )
argc--;
argv++;
/* Parse any options */
if (argc < 1)
usage(kill_usage);
if ( **(argv+1) == '-' ) {
if (isdigit( *(*(++argv)+1) )) {
while (argc > 0 && **argv == '-') {
while (*++(*argv)) {
switch (**argv) {
case 'l':
{
int col=0;
const struct signal_name *s = signames;
while (s->name != 0) {
col+=fprintf(stderr, "%2d) %-8s", s->number, (s++)->name);
if (col>60) {
fprintf(stderr, "\n");
col=0;
}
}
fprintf(stderr, "\n\n");
exit( TRUE);
}
break;
case '-':
usage(kill_usage);
default:
{
if (isdigit( **argv)) {
sig = atoi (*argv);
if (sig < 0 || sig >= NSIG)
goto end;
else {
argc--;
argv++;
goto do_it_now;
}
}
else {
const struct signal_name *s = signames;
while (s->name != 0) {
if (strcasecmp (s->name, *argv+1) == 0) {
if (strcasecmp (s->name, *argv) == 0) {
sig = s->number;
break;
argc--;
argv++;
goto do_it_now;
}
s++;
}
@ -137,19 +175,37 @@ extern int kill_main (int argc, char **argv)
goto end;
}
}
}
argc--;
argv++;
}
}
while (--argc > 1) {
do_it_now:
while (argc >= 1) {
int pid;
if (! isdigit( **(++argv))) {
struct stat statbuf;
char pidpath[20]="/proc/";
if (! isdigit( **argv)) {
fprintf(stderr, "bad PID: %s\n", *argv);
exit( FALSE);
}
pid = atoi (*argv);
snprintf(pidpath, 20, "/proc/%s/stat", *argv);
if (stat( pidpath, &statbuf)!=0) {
fprintf(stderr, "kill: (%d) - No such pid\n", pid);
exit( FALSE);
}
if (kill (pid, sig) != 0) {
perror (*argv);
exit ( FALSE);
}
argv++;
}
exit ( TRUE);
end:
fprintf(stderr, "bad signal name: %s\n", *argv);

2
networking/hostname.c
View File

@ -1,5 +1,5 @@
/*
* $Id: hostname.c,v 1.3 1999/12/08 04:23:30 andersen Exp $
* $Id: hostname.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>

3
networking/ping.c
View File

@ -1,5 +1,5 @@
/*
* $Id: ping.c,v 1.3 1999/12/08 04:23:30 andersen Exp $
* $Id: ping.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
* Mini ping implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@ -63,6 +63,7 @@
#define TST(bit) (A(bit) & B(bit))
static const char* ping_usage = "ping [OPTION]... host\n\n"
"Send ICMP ECHO_REQUEST packets to network hosts.\n\n"
"Options:\n"
"\t-q\t\tQuiet mode, only displays output at start and when finished.\n"
"\t-c COUNT\tSend only COUNT pings.\n";

3
ping.c
View File

@ -1,5 +1,5 @@
/*
* $Id: ping.c,v 1.3 1999/12/08 04:23:30 andersen Exp $
* $Id: ping.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
* Mini ping implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@ -63,6 +63,7 @@
#define TST(bit) (A(bit) & B(bit))
static const char* ping_usage = "ping [OPTION]... host\n\n"
"Send ICMP ECHO_REQUEST packets to network hosts.\n\n"
"Options:\n"
"\t-q\t\tQuiet mode, only displays output at start and when finished.\n"
"\t-c COUNT\tSend only COUNT pings.\n";

35
procps/free.c Normal file
View File

@ -0,0 +1,35 @@
/*
* Mini free implementation for busybox
*
* Copyright (C) 1999 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* 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 "internal.h"
#include <stdio.h>
#if ! defined BB_FEATURE_USE_PROCFS
#error Sorry, I depend on the /proc filesystem right now.
#endif
extern int free_main(int argc, char **argv)
{
char* cmd[] = { "cat", "/proc/meminfo", "\0" };
exit(cat_main( 3, cmd));
}

72
procps/kill.c
View File

@ -26,8 +26,14 @@
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#include <sys/stat.h>
#include <unistd.h>
static const char* kill_usage = "kill [-signal] process-id [process-id ...]\n\n"
"Send a signal (default is SIGTERM) to the specified process(es).\n\n"
"Options:\n"
"\t-l\tList all signal names and numbers.\n\n";
const char kill_usage[] = "kill [-signal] process-id [process-id ...]\n";
struct signal_name {
const char *name;
@ -115,21 +121,53 @@ extern int kill_main (int argc, char **argv)
{
int sig = SIGTERM;
if ( argc < 2 )
argc--;
argv++;
/* Parse any options */
if (argc < 1)
usage(kill_usage);
if ( **(argv+1) == '-' ) {
if (isdigit( *(*(++argv)+1) )) {
while (argc > 0 && **argv == '-') {
while (*++(*argv)) {
switch (**argv) {
case 'l':
{
int col=0;
const struct signal_name *s = signames;
while (s->name != 0) {
col+=fprintf(stderr, "%2d) %-8s", s->number, (s++)->name);
if (col>60) {
fprintf(stderr, "\n");
col=0;
}
}
fprintf(stderr, "\n\n");
exit( TRUE);
}
break;
case '-':
usage(kill_usage);
default:
{
if (isdigit( **argv)) {
sig = atoi (*argv);
if (sig < 0 || sig >= NSIG)
goto end;
else {
argc--;
argv++;
goto do_it_now;
}
}
else {
const struct signal_name *s = signames;
while (s->name != 0) {
if (strcasecmp (s->name, *argv+1) == 0) {
if (strcasecmp (s->name, *argv) == 0) {
sig = s->number;
break;
argc--;
argv++;
goto do_it_now;
}
s++;
}
@ -137,19 +175,37 @@ extern int kill_main (int argc, char **argv)
goto end;
}
}
}
argc--;
argv++;
}
}
while (--argc > 1) {
do_it_now:
while (argc >= 1) {
int pid;
if (! isdigit( **(++argv))) {
struct stat statbuf;
char pidpath[20]="/proc/";
if (! isdigit( **argv)) {
fprintf(stderr, "bad PID: %s\n", *argv);
exit( FALSE);
}
pid = atoi (*argv);
snprintf(pidpath, 20, "/proc/%s/stat", *argv);
if (stat( pidpath, &statbuf)!=0) {
fprintf(stderr, "kill: (%d) - No such pid\n", pid);
exit( FALSE);
}
if (kill (pid, sig) != 0) {
perror (*argv);
exit ( FALSE);
}
argv++;
}
exit ( TRUE);
end:
fprintf(stderr, "bad signal name: %s\n", *argv);

2
regexp.c
View File

@ -98,7 +98,9 @@ extern int replace_match(char *haystack, char *needle, char *newNeedle, int igno
static char *previous; /* the previous regexp, used when null regexp is given */
#if defined BB_SED
static char *previous1; /* a copy of the text from the previous substitution for regsub()*/
#endif
/* These are used to classify or recognize meta-characters */

955
tail.c Normal file
View File

@ -0,0 +1,955 @@
/* 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. */
/* Can display any amount of data, unlike the Unix version, which uses
a fixed size buffer and therefore can only deliver a limited number
of lines.
Options:
-b Tail by N 512-byte blocks.
-c, --bytes=N[bkm] Tail by N bytes
[or 512-byte blocks, kilobytes, or megabytes].
-f, --follow Loop forever trying to read more characters at the
end of the file, on the assumption that the file
is growing. Ignored if reading from a pipe.
-n, --lines=N Tail by N lines.
-q, --quiet, --silent Never print filename headers.
-v, --verbose Always print filename headers.
If a number (N) starts with a `+', begin printing with the Nth item
from the start of each file, instead of from the end.
Reads from standard input if no files are given or when a filename of
``-'' is encountered.
By default, filename headers are printed only more than one file
is given.
By default, prints the last 10 lines (tail -n 10).
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>. */
#include "internal.h"
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
/* Disable assertions. Some systems have broken assert macros. */
#define NDEBUG 1
static void error(int i, int errnum, char* fmt, const char *msg)
{
fprintf(stderr, fmt, msg);
perror( errnum);
exit(i);
}
#define XWRITE(fd, buffer, n_bytes) \
do \
{ \
assert ((fd) == 1); \
assert ((n_bytes) >= 0); \
if (n_bytes > 0 && fwrite ((buffer), 1, (n_bytes), stdout) == 0) \
error (EXIT_FAILURE, errno, "write error", NULL); \
} \
while (0)
/* Number of items to tail. */
#define DEFAULT_N_LINES 10
/* Size of atomic reads. */
#ifndef BUFSIZ
#define BUFSIZ (512 * 8)
#endif
/* If nonzero, interpret the numeric argument as the number of lines.
Otherwise, interpret it as the number of bytes. */
static int count_lines;
/* If nonzero, read from the end of one file until killed. */
static int forever;
/* If nonzero, read from the end of multiple files until killed. */
static int forever_multiple;
/* Array of file descriptors if forever_multiple is 1. */
static int *file_descs;
/* Array of file sizes if forever_multiple is 1. */
static off_t *file_sizes;
/* If nonzero, count from start of file instead of end. */
static int from_start;
/* If nonzero, print filename headers. */
static int print_headers;
/* When to print the filename banners. */
enum header_mode
{
multiple_files, always, never
};
char *xmalloc ();
int safe_read ();
/* The name this program was run with. */
char *program_name;
/* Nonzero if we have ever read standard input. */
static int have_read_stdin;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output then exit. */
static int show_version;
static const char tail_usage[] =
"tail [OPTION]... [FILE]...\n\
Print last 10 lines of each FILE to standard output.\n\
With more than one FILE, precede each with a header giving the file name.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
-c, --bytes=N output the last N bytes\n\
-f, --follow output appended data as the file grows\n\
-n, --lines=N output the last N lines, instead of last 10\n\
-q, --quiet, --silent never output headers giving file names\n\
-v, --verbose always output headers giving file names\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
If the first character of N (the number of bytes or lines) is a `+',\n\
print beginning with the Nth item from the start of each file, otherwise,\n\
print the last N items in the file. N may have a multiplier suffix:\n\
b for 512, k for 1024, m for 1048576 (1 Meg). A first OPTION of -VALUE\n\
or +VALUE is treated like -n VALUE or -n +VALUE unless VALUE has one of\n\
the [bkm] suffix multipliers, in which case it is treated like -c VALUE\n\
or -c +VALUE.\n";
static void
write_header (const char *filename, const char *comment)
{
static int first_file = 1;
printf ("%s==> %s%s%s <==\n", (first_file ? "" : "\n"), filename,
(comment ? ": " : ""),
(comment ? comment : ""));
first_file = 0;
}
/* Print the last N_LINES lines from the end of file FD.
Go backward through the file, reading `BUFSIZ' bytes at a time (except
probably the first), until we hit the start of the file or have
read NUMBER newlines.
POS starts out as the length of the file (the offset of the last
byte of the file + 1).
Return 0 if successful, 1 if an error occurred. */
static int
file_lines (const char *filename, int fd, long int n_lines, off_t pos)
{
char buffer[BUFSIZ];
int bytes_read;
int i; /* Index into `buffer' for scanning. */
if (n_lines == 0)
return 0;
/* Set `bytes_read' to the size of the last, probably partial, buffer;
0 < `bytes_read' <= `BUFSIZ'. */
bytes_read = pos % BUFSIZ;
if (bytes_read == 0)
bytes_read = BUFSIZ;
/* Make `pos' a multiple of `BUFSIZ' (0 if the file is short), so that all
reads will be on block boundaries, which might increase efficiency. */
pos -= bytes_read;
lseek (fd, pos, SEEK_SET);
bytes_read = safe_read (fd, buffer, bytes_read);
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
/* Count the incomplete line on files that don't end with a newline. */
if (bytes_read && buffer[bytes_read - 1] != '\n')
--n_lines;
do
{
/* Scan backward, counting the newlines in this bufferfull. */
for (i = bytes_read - 1; i >= 0; i--)
{
/* Have we counted the requested number of newlines yet? */
if (buffer[i] == '\n' && n_lines-- == 0)
{
/* If this newline wasn't the last character in the buffer,
print the text after it. */
if (i != bytes_read - 1)
XWRITE (STDOUT_FILENO, &buffer[i + 1], bytes_read - (i + 1));
return 0;
}
}
/* Not enough newlines in that bufferfull. */
if (pos == 0)
{
/* Not enough lines in the file; print the entire file. */
lseek (fd, (off_t) 0, SEEK_SET);
return 0;
}
pos -= BUFSIZ;
lseek (fd, pos, SEEK_SET);
}
while ((bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0);
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
return 0;
}
/* Print the last N_LINES lines from the end of the standard input,
open for reading as pipe FD.
Buffer the text as a linked list of LBUFFERs, adding them as needed.
Return 0 if successful, 1 if an error occured. */
static int
pipe_lines (const char *filename, int fd, long int n_lines)
{
struct linebuffer
{
int nbytes, nlines;
char buffer[BUFSIZ];
struct linebuffer *next;
};
typedef struct linebuffer LBUFFER;
LBUFFER *first, *last, *tmp;
int i; /* Index into buffers. */
int total_lines = 0; /* Total number of newlines in all buffers. */
int errors = 0;
first = last = (LBUFFER *) xmalloc (sizeof (LBUFFER));
first->nbytes = first->nlines = 0;
first->next = NULL;
tmp = (LBUFFER *) xmalloc (sizeof (LBUFFER));
/* Input is always read into a fresh buffer. */
while ((tmp->nbytes = safe_read (fd, tmp->buffer, BUFSIZ)) > 0)
{
tmp->nlines = 0;
tmp->next = NULL;
/* Count the number of newlines just read. */
for (i = 0; i < tmp->nbytes; i++)
if (tmp->buffer[i] == '\n')
++tmp->nlines;
total_lines += tmp->nlines;
/* If there is enough room in the last buffer read, just append the new
one to it. This is because when reading from a pipe, `nbytes' can
often be very small. */
if (tmp->nbytes + last->nbytes < BUFSIZ)
{
memcpy (&last->buffer[last->nbytes], tmp->buffer, tmp->nbytes);
last->nbytes += tmp->nbytes;
last->nlines += tmp->nlines;
}
else
{
/* If there's not enough room, link the new buffer onto the end of
the list, then either free up the oldest buffer for the next
read if that would leave enough lines, or else malloc a new one.
Some compaction mechanism is possible but probably not
worthwhile. */
last = last->next = tmp;
if (total_lines - first->nlines > n_lines)
{
tmp = first;
total_lines -= first->nlines;
first = first->next;
}
else
tmp = (LBUFFER *) xmalloc (sizeof (LBUFFER));
}
}
if (tmp->nbytes == -1)
{
error (0, errno, "%s", filename);
errors = 1;
free ((char *) tmp);
goto free_lbuffers;
}
free ((char *) tmp);
/* This prevents a core dump when the pipe contains no newlines. */
if (n_lines == 0)
goto free_lbuffers;
/* Count the incomplete line on files that don't end with a newline. */
if (last->buffer[last->nbytes - 1] != '\n')
{
++last->nlines;
++total_lines;
}
/* Run through the list, printing lines. First, skip over unneeded
buffers. */
for (tmp = first; total_lines - tmp->nlines > n_lines; tmp = tmp->next)
total_lines -= tmp->nlines;
/* Find the correct beginning, then print the rest of the file. */
if (total_lines > n_lines)
{
char *cp;
/* Skip `total_lines' - `n_lines' newlines. We made sure that
`total_lines' - `n_lines' <= `tmp->nlines'. */
cp = tmp->buffer;
for (i = total_lines - n_lines; i; --i)
while (*cp++ != '\n')
/* Do nothing. */ ;
i = cp - tmp->buffer;
}
else
i = 0;
XWRITE (STDOUT_FILENO, &tmp->buffer[i], tmp->nbytes - i);
for (tmp = tmp->next; tmp; tmp = tmp->next)
XWRITE (STDOUT_FILENO, tmp->buffer, tmp->nbytes);
free_lbuffers:
while (first)
{
tmp = first->next;
free ((char *) first);
first = tmp;
}
return errors;
}
/* Print the last N_BYTES characters from the end of pipe FD.
This is a stripped down version of pipe_lines.
Return 0 if successful, 1 if an error occurred. */
static int
pipe_bytes (const char *filename, int fd, off_t n_bytes)
{
struct charbuffer
{
int nbytes;
char buffer[BUFSIZ];
struct charbuffer *next;
};
typedef struct charbuffer CBUFFER;
CBUFFER *first, *last, *tmp;
int i; /* Index into buffers. */
int total_bytes = 0; /* Total characters in all buffers. */
int errors = 0;
first = last = (CBUFFER *) xmalloc (sizeof (CBUFFER));
first->nbytes = 0;
first->next = NULL;
tmp = (CBUFFER *) xmalloc (sizeof (CBUFFER));
/* Input is always read into a fresh buffer. */
while ((tmp->nbytes = safe_read (fd, tmp->buffer, BUFSIZ)) > 0)
{
tmp->next = NULL;
total_bytes += tmp->nbytes;
/* If there is enough room in the last buffer read, just append the new
one to it. This is because when reading from a pipe, `nbytes' can
often be very small. */
if (tmp->nbytes + last->nbytes < BUFSIZ)
{
memcpy (&last->buffer[last->nbytes], tmp->buffer, tmp->nbytes);
last->nbytes += tmp->nbytes;
}
else
{
/* If there's not enough room, link the new buffer onto the end of
the list, then either free up the oldest buffer for the next
read if that would leave enough characters, or else malloc a new
one. Some compaction mechanism is possible but probably not
worthwhile. */
last = last->next = tmp;
if (total_bytes - first->nbytes > n_bytes)
{
tmp = first;
total_bytes -= first->nbytes;
first = first->next;
}
else
{
tmp = (CBUFFER *) xmalloc (sizeof (CBUFFER));
}
}
}
if (tmp->nbytes == -1)
{
error (0, errno, "%s", filename);
errors = 1;
free ((char *) tmp);
goto free_cbuffers;
}
free ((char *) tmp);
/* Run through the list, printing characters. First, skip over unneeded
buffers. */
for (tmp = first; total_bytes - tmp->nbytes > n_bytes; tmp = tmp->next)
total_bytes -= tmp->nbytes;
/* Find the correct beginning, then print the rest of the file.
We made sure that `total_bytes' - `n_bytes' <= `tmp->nbytes'. */
if (total_bytes > n_bytes)
i = total_bytes - n_bytes;
else
i = 0;
XWRITE (STDOUT_FILENO, &tmp->buffer[i], tmp->nbytes - i);
for (tmp = tmp->next; tmp; tmp = tmp->next)
XWRITE (STDOUT_FILENO, tmp->buffer, tmp->nbytes);
free_cbuffers:
while (first)
{
tmp = first->next;
free ((char *) first);
first = tmp;
}
return errors;
}
/* Skip N_BYTES characters from the start of pipe FD, and print
any extra characters that were read beyond that.
Return 1 on error, 0 if ok. */
static int
start_bytes (const char *filename, int fd, off_t n_bytes)
{
char buffer[BUFSIZ];
int bytes_read = 0;
while (n_bytes > 0 && (bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
n_bytes -= bytes_read;
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
else if (n_bytes < 0)
XWRITE (STDOUT_FILENO, &buffer[bytes_read + n_bytes], -n_bytes);
return 0;
}
/* Skip N_LINES lines at the start of file or pipe FD, and print
any extra characters that were read beyond that.
Return 1 on error, 0 if ok. */
static int
start_lines (const char *filename, int fd, long int n_lines)
{
char buffer[BUFSIZ];
int bytes_read = 0;
int bytes_to_skip = 0;
while (n_lines && (bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
{
bytes_to_skip = 0;
while (bytes_to_skip < bytes_read)
if (buffer[bytes_to_skip++] == '\n' && --n_lines == 0)
break;
}
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
return 1;
}
else if (bytes_to_skip < bytes_read)
{
XWRITE (STDOUT_FILENO, &buffer[bytes_to_skip],
bytes_read - bytes_to_skip);
}
return 0;
}
/* Display file FILENAME from the current position in FD to the end.
If `forever' is nonzero, keep reading from the end of the file
until killed. Return the number of bytes read from the file. */
static long
dump_remainder (const char *filename, int fd)
{
char buffer[BUFSIZ];
int bytes_read;
long total;
total = 0;
output:
while ((bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
{
XWRITE (STDOUT_FILENO, buffer, bytes_read);
total += bytes_read;
}
if (bytes_read == -1)
error (EXIT_FAILURE, errno, "%s", filename);
if (forever)
{
fflush (stdout);
sleep (1);
goto output;
}
else
{
if (forever_multiple)
fflush (stdout);
}
return total;
}
/* Tail NFILES (>1) files forever until killed. The file names are in
NAMES. The open file descriptors are in `file_descs', and the size
at which we stopped tailing them is in `file_sizes'. We loop over
each of them, doing an fstat to see if they have changed size. If
none of them have changed size in one iteration, we sleep for a
second and try again. We do this until the user interrupts us. */
static void
tail_forever (char **names, int nfiles)
{
int last;
last = -1;
while (1)
{
int i;
int changed;
changed = 0;
for (i = 0; i < nfiles; i++)
{
struct stat stats;
if (file_descs[i] < 0)
continue;
if (fstat (file_descs[i], &stats) < 0)
{
error (0, errno, "%s", names[i]);
file_descs[i] = -1;
continue;
}
if (stats.st_size == file_sizes[i])
continue;
/* This file has changed size. Print out what we can, and
then keep looping. */
changed = 1;
if (stats.st_size < file_sizes[i])
{
write_header (names[i], "file truncated");
last = i;
lseek (file_descs[i], stats.st_size, SEEK_SET);
file_sizes[i] = stats.st_size;
continue;
}
if (i != last)
{
if (print_headers)
write_header (names[i], NULL);
last = i;
}
file_sizes[i] += dump_remainder (names[i], file_descs[i]);
}
/* If none of the files changed size, sleep. */
if (! changed)
sleep (1);
}
}
/* Output the last N_BYTES bytes of file FILENAME open for reading in FD.
Return 0 if successful, 1 if an error occurred. */
static int
tail_bytes (const char *filename, int fd, off_t n_bytes)
{
struct stat stats;
/* FIXME: resolve this like in dd.c. */
/* Use fstat instead of checking for errno == ESPIPE because
lseek doesn't work on some special files but doesn't return an
error, either. */
if (fstat (fd, &stats))
{
error (0, errno, "%s", filename);
return 1;
}
if (from_start)
{
if (S_ISREG (stats.st_mode))
lseek (fd, n_bytes, SEEK_CUR);
else if (start_bytes (filename, fd, n_bytes))
return 1;
dump_remainder (filename, fd);
}
else
{
if (S_ISREG (stats.st_mode))
{
off_t current_pos, end_pos;
size_t bytes_remaining;
if ((current_pos = lseek (fd, (off_t) 0, SEEK_CUR)) != -1
&& (end_pos = lseek (fd, (off_t) 0, SEEK_END)) != -1)
{
off_t diff;
/* Be careful here. The current position may actually be
beyond the end of the file. */
bytes_remaining = (diff = end_pos - current_pos) < 0 ? 0 : diff;
}
else
{
error (0, errno, "%s", filename);
return 1;
}
if (bytes_remaining <= n_bytes)
{
/* From the current position to end of file, there are no
more bytes than have been requested. So reposition the
file pointer to the incoming current position and print
everything after that. */
lseek (fd, current_pos, SEEK_SET);
}
else
{
/* There are more bytes remaining than were requested.
Back up. */
lseek (fd, -n_bytes, SEEK_END);
}
dump_remainder (filename, fd);
}
else
return pipe_bytes (filename, fd, n_bytes);
}
return 0;
}
/* Output the last N_LINES lines of file FILENAME open for reading in FD.
Return 0 if successful, 1 if an error occurred. */
static int
tail_lines (const char *filename, int fd, long int n_lines)
{
struct stat stats;
off_t length;
if (fstat (fd, &stats))
{
error (0, errno, "%s", filename);
return 1;
}
if (from_start)
{
if (start_lines (filename, fd, n_lines))
return 1;
dump_remainder (filename, fd);
}
else
{
/* Use file_lines only if FD refers to a regular file with
its file pointer positioned at beginning of file. */
/* FIXME: adding the lseek conjunct is a kludge.
Once there's a reasonable test suite, fix the true culprit:
file_lines. file_lines shouldn't presume that the input
file pointer is initially positioned to beginning of file. */
if (S_ISREG (stats.st_mode)
&& lseek (fd, (off_t) 0, SEEK_CUR) == (off_t) 0)
{
length = lseek (fd, (off_t) 0, SEEK_END);
if (length != 0 && file_lines (filename, fd, n_lines, length))
return 1;
dump_remainder (filename, fd);
}
else
return pipe_lines (filename, fd, n_lines);
}
return 0;
}
/* Display the last N_UNITS units of file FILENAME, open for reading
in FD.
Return 0 if successful, 1 if an error occurred. */
static int
tail (const char *filename, int fd, off_t n_units)
{
if (count_lines)
return tail_lines (filename, fd, (long) n_units);
else
return tail_bytes (filename, fd, n_units);
}
/* Display the last N_UNITS units of file FILENAME.
"-" for FILENAME means the standard input.
FILENUM is this file's index in the list of files the user gave.
Return 0 if successful, 1 if an error occurred. */
static int
tail_file (const char *filename, off_t n_units, int filenum)
{
int fd, errors;
struct stat stats;
if (!strcmp (filename, "-")
{
have_read_stdin = 1;
filename = "standard input";
if (print_headers)
write_header (filename, NULL);
errors = tail (filename, 0, n_units);
if (forever_multiple)
{
if (fstat (0, &stats) < 0)
{
error (0, errno, "standard input");
errors = 1;
}
else if (!S_ISREG (stats.st_mode))
{
error (0, 0,
"standard input: cannot follow end of non-regular file");
errors = 1;
}
if (errors)
file_descs[filenum] = -1;
else
{
file_descs[filenum] = 0;
file_sizes[filenum] = stats.st_size;
}
}
}
else
{
/* Not standard input. */
fd = open (filename, O_RDONLY);
if (fd == -1)
{
if (forever_multiple)
file_descs[filenum] = -1;
error (0, errno, "%s", filename);
errors = 1;
}
else
{
if (print_headers)
write_header (filename, NULL);
errors = tail (filename, fd, n_units);
if (forever_multiple)
{
if (fstat (fd, &stats) < 0)
{
error (0, errno, "%s", filename);
errors = 1;
}
else if (!S_ISREG (stats.st_mode))
{
error (0, 0, "%s: cannot follow end of non-regular file",
filename);
errors = 1;
}
if (errors)
{
close (fd);
file_descs[filenum] = -1;
}
else
{
file_descs[filenum] = fd;
file_sizes[filenum] = stats.st_size;
}
}
else
{
if (close (fd))
{
error (0, errno, "%s", filename);
errors = 1;
}
}
}
}
return errors;
}
extern int
tai_main (int argc, char **argv)
{
enum header_mode header_mode = multiple_files;
int exit_status = 0;
/* If from_start, the number of items to skip before printing; otherwise,
the number of items at the end of the file to print. Initially, -1
means the value has not been set. */
off_t n_units = -1;
long int tmp_long;
int c; /* Option character. */
int n_files;
char **file;
program_name = argv[0];
have_read_stdin = 0;
count_lines = 1;
forever = forever_multiple = from_start = print_headers = 0;
if (argc > 1
&& ((argv[1][0] == '-' && ISDIGIT (argv[1][1]))
|| (argv[1][0] == '+' && (ISDIGIT (argv[1][1])
|| argv[1][1] == 0))))
{
/* Old option syntax: a dash or plus, one or more digits (zero digits
are acceptable with a plus), and one or more option letters. */
if (argv[1][0] == '+')
from_start = 1;
if (argv[1][1] != '\0')
{
strtol_error s_err;
char *p;
s_err = xstrtol (++argv[1], &p, 0, &tmp_long, "bkm");
n_units = tmp_long;
if (s_err == LONGINT_OVERFLOW)
{
STRTOL_FATAL_ERROR (argv[1], "argument", s_err);
}
/* If a [bkm] suffix was given then count bytes, not lines. */
if (p[-1] == 'b' || p[-1] == 'k' || p[-1] == 'm')
count_lines = 0;
/* Parse any appended option letters. */
while (*p)
{
switch (*p)
{
case 'c':
/* Interpret N_UNITS as # of bytes. */
count_lines = 0;
break;
case 'f':
forever = 1;
break;
case 'l':
count_lines = 1;
break;
case 'q':
header_mode = never;
break;
case 'v':
header_mode = always;
break;
default:
error (0, 0, "unrecognized option '%c'", *p);
usage (tail_usage);
}
++p;
}
}
/* Make the options we just parsed invisible to getopt. */
argv[1] = argv[0];
argv++;
argc--;
}
if (show_version)
{
printf ("tail - %s\n", PACKAGE_VERSION);
exit (EXIT_SUCCESS);
}
if (show_help)
usage (tail_usage);
if (n_units == -1)
n_units = DEFAULT_N_LINES;
/* To start printing with item N_UNITS from the start of the file, skip
N_UNITS - 1 items. `tail +0' is actually meaningless, but for Unix
compatibility it's treated the same as `tail +1'. */
if (from_start)
{
if (n_units)
--n_units;
}
n_files = argc - optind;
file = argv + optind;
if (n_files > 1 && forever)
{
forever_multiple = 1;
forever = 0;
file_descs = (int *) xmalloc (n_files * sizeof (int));
file_sizes = (off_t *) xmalloc (n_files * sizeof (off_t));
}
if (header_mode == always
|| (header_mode == multiple_files && n_files > 1))
print_headers = 1;
if (n_files == 0)
{
exit_status |= tail_file ("-", n_units, 0);
}
else
{
int i;
for (i = 0; i < n_files; i++)
exit_status |= tail_file (file[i], n_units, i);
if (forever_multiple)
tail_forever (file, n_files);
}
if (have_read_stdin && close (0) < 0)
error (EXIT_FAILURE, errno, "-");
if (fclose (stdout) == EOF)
error (EXIT_FAILURE, errno, "write error");
exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}

1
utility.c
View File

@ -49,7 +49,6 @@ const char mtab_file[] = "/etc/mtab";
#endif
/* volatile so gcc knows this is the end of the line */
extern void usage(const char *usage)
{
fprintf(stderr, "BusyBox v%s (%s) multi-call binary -- GPL2\n\n", BB_VER, BB_BT);