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).
+ 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>. */
+ 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>
+
+ */
#include "internal.h"
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <ctype.h>
+
/* Disable assertions. Some systems have broken assert macros. */
#define NDEBUG 1
-static void error(int i, int errnum, char* fmt, const char *msg)
+static void error(int i, int errnum, char* fmt, ...)
{
- fprintf(stderr, fmt, msg);
- perror( errnum);
+ va_list arguments;
+
+ va_start(arguments, fmt);
+ vfprintf(stderr, fmt, arguments);
+ fprintf(stderr, "\n%s\n", strerror( errnum));
+ va_end(arguments);
exit(i);
}
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); \
+ error (EXIT_FAILURE, errno, "write error"); \
} \
while (0)
};
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\
+\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\
+ -c=N[kbm] output the last N bytes\n\
+ -f output appended data as the file grows\n\
+ -n=N output the last N lines, instead of last 10\n\
+ -q never output headers giving file names\n\
+ -v always output headers giving file names\n\
+ --help display this help 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";
+If the first character of N (bytes or lines) is a `+', output begins with \n\
+the Nth item from the start of each file, otherwise, print the last N items\n\
+in the file. N bytes may be suffixed by k (x1024), b (x512), or m (1024^2).\n\n";
static void
write_header (const char *filename, const char *comment)
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);
+ bytes_read = fullRead (fd, buffer, bytes_read);
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
pos -= BUFSIZ;
lseek (fd, pos, SEEK_SET);
}
- while ((bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0);
+ while ((bytes_read = fullRead (fd, buffer, BUFSIZ)) > 0);
if (bytes_read == -1)
{
error (0, errno, "%s", filename);
tmp = (LBUFFER *) xmalloc (sizeof (LBUFFER));
/* Input is always read into a fresh buffer. */
- while ((tmp->nbytes = safe_read (fd, tmp->buffer, BUFSIZ)) > 0)
+ while ((tmp->nbytes = fullRead (fd, tmp->buffer, BUFSIZ)) > 0)
{
tmp->nlines = 0;
tmp->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)
+ while ((tmp->nbytes = fullRead (fd, tmp->buffer, BUFSIZ)) > 0)
{
tmp->next = NULL;
char buffer[BUFSIZ];
int bytes_read = 0;
- while (n_bytes > 0 && (bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
+ while (n_bytes > 0 && (bytes_read = fullRead (fd, buffer, BUFSIZ)) > 0)
n_bytes -= bytes_read;
if (bytes_read == -1)
{
int bytes_read = 0;
int bytes_to_skip = 0;
- while (n_lines && (bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
+ while (n_lines && (bytes_read = fullRead (fd, buffer, BUFSIZ)) > 0)
{
bytes_to_skip = 0;
while (bytes_to_skip < bytes_read)
total = 0;
output:
- while ((bytes_read = safe_read (fd, buffer, BUFSIZ)) > 0)
+ while ((bytes_read = fullRead (fd, buffer, BUFSIZ)) > 0)
{
XWRITE (STDOUT_FILENO, buffer, bytes_read);
total += bytes_read;
int fd, errors;
struct stat stats;
- if (!strcmp (filename, "-")
+ if (!strcmp (filename, "-"))
{
have_read_stdin = 1;
filename = "standard input";
}
extern int
-tai_main (int argc, char **argv)
+tail_main (int argc, char **argv)
{
+ int stopit = 0;
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;
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)
- {
+
+ /* Parse any options */
+ //fprintf(stderr, "argc=%d, argv=%s\n", argc, *argv);
+ while (--argc > 0 && ( **(++argv) == '-' || **argv == '+' )) {
+ if (**argv == '+') {
+ from_start = 1;
+ }
+ stopit = 0;
+ while (stopit == 0 && *(++(*argv))) {
+ switch (**argv) {
case 'c':
- /* Interpret N_UNITS as # of bytes. */
count_lines = 0;
+
+ if (--argc < 1) {
+ usage(tail_usage);
+ }
+ n_units = getNum(*(++argv));
+ stopit = 1;
break;
case 'f':
forever = 1;
break;
- case 'l':
+ case 'n':
count_lines = 1;
+
+ if (--argc < 1) {
+ usage(tail_usage);
+ }
+ n_units = atol(*(++argv));
+ stopit = 1;
break;
case 'q':
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;
--n_units;
}
- n_files = argc - optind;
- file = argv + optind;
+ n_files = argc;
+ file = argv;
if (n_files > 1 && forever)
{
projects / oweals / busybox.git / blobdiff