Tail now works (costs 6k). Several other updates.

 -Erik

12 files changed, 241 insertions, 376 deletions

diff --git a/Changelog b/Changelog
index 62a317123..99963cef9 100644
--- a/Changelog
+++ b/Changelog
@@ -2,19 +2,19 @@
         * New Apps: ping and hostname contributed by Randolph Chung
             <tausq@debian.org>.  2 items off the TODO list!
         * I wrote free (just calls "cat /proc/meminfo").
+        * Added tail, based on tail from GNU textutils-1.19, but adjusted
+            to suit my evil purposes.  Costs 6k.
         * 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, but it doesn't work yet.
-        * my_getid was leaking file descriptors, causing 'ls -l' on long
-            directories to fail
+        * 'ls -l' was failing on long directories, since my_getid was leaking 
+            one file descriptor per file.  Oops.
 
         -Erik Andrsen
 
-
 0.38
         * Fixed a segfault in 'umount -a' when a badly formed /etc/fstab
             file existed.
diff --git a/TODO b/TODO
index 668338299..08b2fd736 100644
--- a/TODO
+++ b/TODO
@@ -18,13 +18,14 @@ around to it some time. If you have any good ideas, please let me know.
 * traceroute/nslookup/netstat
 * rdate
 * hwclock
-* login/getty
 * killall
 * tee
 * stty
-* head/tail
+* head
 * sort/uniq
 * wc
 * tr
-* expr (maybe)?
+* expr (maybe)?  (ash builtin?)
+* login/sulogin/passwd/getty  (These are actully now part of tinylogin, which 
+                                I've just started to maintain).
 
diff --git a/coreutils/dd.c b/coreutils/dd.c
index b37038748..90c1004fa 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -48,54 +48,10 @@ static const char dd_usage[] =
 "\tcount=n\tcopy only n input blocks\n"
 //"\tskip=n\tskip n input blocks\n"
 "\n"
-"BYTES may be suffixed: by k for x1024, b for x512, and w for x2.\n";
+"BYTES may be suffixed by w (x2), k (x1024), b (x512), or m (x1024^2).\n";
 
 
 
-
-/*
- * Read a number with a possible multiplier.
- * Returns -1 if the number format is illegal.
- */
-static long getNum (const char *cp)
-{
-    long value;
-
-    if (!isDecimal (*cp))
-        return -1;
-
-    value = 0;
-
-    while (isDecimal (*cp))
-        value = value * 10 + *cp++ - '0';
-
-    switch (*cp++) {
-    case 'k':
-        value *= 1024;
-        break;
-
-    case 'b':
-        value *= 512;
-        break;
-
-    case 'w':
-        value *= 2;
-        break;
-
-    case '\0':
-        return value;
-
-    default:
-        return -1;
-    }
-
-    if (*cp)
-        return -1;
-
-    return value;
-}
-
-
 extern int dd_main (int argc, char **argv)
 {
     const char *inFile = NULL;
diff --git a/coreutils/tail.c b/coreutils/tail.c
index 058d462a5..7a64c4ca3 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -13,35 +13,16 @@
 
    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"
 
@@ -49,16 +30,25 @@
 #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);
 }
 
@@ -69,7 +59,7 @@ static void error(int i, int errnum, char* fmt, const char *msg)
       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)
 
@@ -110,7 +100,6 @@ enum header_mode
 };
 
 char *xmalloc ();
-int safe_read ();
 
 /* The name this program was run with.  */
 char *program_name;
@@ -118,33 +107,24 @@ 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)
@@ -184,7 +164,7 @@ file_lines (const char *filename, int fd, long int n_lines, off_t pos)
      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);
@@ -220,7 +200,7 @@ file_lines (const char *filename, int fd, long int n_lines, off_t pos)
       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);
@@ -255,7 +235,7 @@ pipe_lines (const char *filename, int fd, long int n_lines)
   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;
@@ -374,7 +354,7 @@ pipe_bytes (const char *filename, int fd, off_t n_bytes)
   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;
 
@@ -453,7 +433,7 @@ 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)
+  while (n_bytes > 0 && (bytes_read = fullRead (fd, buffer, BUFSIZ)) > 0)
     n_bytes -= bytes_read;
   if (bytes_read == -1)
     {
@@ -476,7 +456,7 @@ start_lines (const char *filename, int fd, long int n_lines)
   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)
@@ -509,7 +489,7 @@ dump_remainder (const char *filename, int fd)
 
   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;
@@ -731,7 +711,7 @@ tail_file (const char *filename, off_t n_units, int filenum)
   int fd, errors;
   struct stat stats;
 
-  if (!strcmp (filename, "-")
+  if (!strcmp (filename, "-"))
     {
       have_read_stdin = 1;
       filename = "standard input";
@@ -815,16 +795,15 @@ tail_file (const char *filename, off_t n_units, int filenum)
 }
 
 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;
 
@@ -832,48 +811,38 @@ tai_main (int argc, char **argv)
   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':
@@ -885,26 +854,11 @@ tai_main (int argc, char **argv)
                   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;
@@ -918,8 +872,8 @@ tai_main (int argc, char **argv)
         --n_units;
     }
 
-  n_files = argc - optind;
-  file = argv + optind;
+  n_files = argc;
+  file = argv;
 
   if (n_files > 1 && forever)
     {
diff --git a/dd.c b/dd.c
index b37038748..90c1004fa 100644
--- a/dd.c
+++ b/dd.c
@@ -48,54 +48,10 @@ static const char dd_usage[] =
 "\tcount=n\tcopy only n input blocks\n"
 //"\tskip=n\tskip n input blocks\n"
 "\n"
-"BYTES may be suffixed: by k for x1024, b for x512, and w for x2.\n";
+"BYTES may be suffixed by w (x2), k (x1024), b (x512), or m (x1024^2).\n";
 
 
 
-
-/*
- * Read a number with a possible multiplier.
- * Returns -1 if the number format is illegal.
- */
-static long getNum (const char *cp)
-{
-    long value;
-
-    if (!isDecimal (*cp))
-        return -1;
-
-    value = 0;
-
-    while (isDecimal (*cp))
-        value = value * 10 + *cp++ - '0';
-
-    switch (*cp++) {
-    case 'k':
-        value *= 1024;
-        break;
-
-    case 'b':
-        value *= 512;
-        break;
-
-    case 'w':
-        value *= 2;
-        break;
-
-    case '\0':
-        return value;
-
-    default:
-        return -1;
-    }
-
-    if (*cp)
-        return -1;
-
-    return value;
-}
-
-
 extern int dd_main (int argc, char **argv)
 {
     const char *inFile = NULL;
diff --git a/hostname.c b/hostname.c
index be49de395..20e174187 100644
--- a/hostname.c
+++ b/hostname.c
@@ -1,5 +1,5 @@
 /*
- * $Id: hostname.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
+ * $Id: hostname.c,v 1.5 1999/12/09 06:11:36 andersen Exp $
  * Mini hostname implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
diff --git a/internal.h b/internal.h
index 48bad0c69..42c6b93ab 100644
--- a/internal.h
+++ b/internal.h
@@ -155,6 +155,7 @@ extern void write_mtab(char* blockDevice, char* directory,
         char* filesystemType, long flags, char* string_flags);
 extern void erase_mtab(const char * name);
 extern int check_wildcard_match(const char* text, const char* pattern);
+extern long getNum (const char *cp);
 
 
 #if defined BB_MTAB
diff --git a/networking/hostname.c b/networking/hostname.c
index be49de395..20e174187 100644
--- a/networking/hostname.c
+++ b/networking/hostname.c
@@ -1,5 +1,5 @@
 /*
- * $Id: hostname.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
+ * $Id: hostname.c,v 1.5 1999/12/09 06:11:36 andersen Exp $
  * Mini hostname implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
diff --git a/networking/ping.c b/networking/ping.c
index 45f3c20aa..4176ab390 100644
--- a/networking/ping.c
+++ b/networking/ping.c
@@ -1,5 +1,5 @@
 /*
- * $Id: ping.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
+ * $Id: ping.c,v 1.5 1999/12/09 06:11:36 andersen Exp $
  * Mini ping implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@@ -53,6 +53,7 @@
 #define MAXPACKET       65468
 #define MAX_DUP_CHK     (8 * 128)
 #define MAXWAIT         10
+#define PINGINTERVAL    1 /* second */
 
 #define O_QUIET         (1 << 0)
 
@@ -155,8 +156,8 @@ static void sendping(int ign)
     }
 
     signal(SIGALRM, sendping);
-    if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next */
-        alarm(1);
+    if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
+        alarm(PINGINTERVAL);
     } else { /* done, wait for the last ping to come back */
         /* todo, don't necessarily need to wait so long... */
         signal(SIGALRM, pingstats);
@@ -243,9 +244,8 @@ static void ping(char *host)
         exit(1);
     }
 
-#ifdef SUID_BUSYBOX
+    /* drop root privs if running setuid */
     setuid(getuid());
-#endif
     
     memset(&pingaddr, 0, sizeof(struct sockaddr_in));
     pingaddr.sin_family = AF_INET;
@@ -305,35 +305,31 @@ static void ping(char *host)
 
 extern int ping_main(int argc, char **argv)
 {
+    char *thisarg;
+    
     argc--;
     argv++;
     options = 0;
     /* Parse any options */
-    if (argc < 1) usage(ping_usage);
-
-    while (**argv == '-') {
-        while (*++(*argv))
-            switch (**argv) {
-            case 'c':
-                argc--; argv++;
-                if (argc < 1) usage(ping_usage);
-                pingcount = atoi(*argv);
-                break;
-            case 'q':
-                options |= O_QUIET;
-                break;
-            default:
-                usage(ping_usage);
-            }
-        argc--;
-        argv++;
+    while (argc > 1) {
+        if (**argv != '-') usage(ping_usage);
+        thisarg = *argv; thisarg++;
+        switch (*thisarg) {
+            case 'q': options |= O_QUIET; break;
+            case 'c':
+                argc--; argv++;
+                pingcount = atoi(*argv);                
+                break;
+            default:
+                usage(ping_usage);
+        }
+        argc--; argv++;
     }
-
-    if (argc < 1) usage(ping_usage);
+    if (argc < 1) usage(ping_usage);       
 
     myid = getpid() & 0xFFFF;
-    ping(*(argv++));
-    exit( TRUE);
+    ping(*argv);
+    exit(TRUE);
 }
 
 /*
diff --git a/ping.c b/ping.c
index 45f3c20aa..4176ab390 100644
--- a/ping.c
+++ b/ping.c
@@ -1,5 +1,5 @@
 /*
- * $Id: ping.c,v 1.4 1999/12/08 23:19:36 andersen Exp $
+ * $Id: ping.c,v 1.5 1999/12/09 06:11:36 andersen Exp $
  * Mini ping implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@@ -53,6 +53,7 @@
 #define MAXPACKET       65468
 #define MAX_DUP_CHK     (8 * 128)
 #define MAXWAIT         10
+#define PINGINTERVAL    1 /* second */
 
 #define O_QUIET         (1 << 0)
 
@@ -155,8 +156,8 @@ static void sendping(int ign)
     }
 
     signal(SIGALRM, sendping);
-    if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next */
-        alarm(1);
+    if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */
+        alarm(PINGINTERVAL);
     } else { /* done, wait for the last ping to come back */
         /* todo, don't necessarily need to wait so long... */
         signal(SIGALRM, pingstats);
@@ -243,9 +244,8 @@ static void ping(char *host)
         exit(1);
     }
 
-#ifdef SUID_BUSYBOX
+    /* drop root privs if running setuid */
     setuid(getuid());
-#endif
     
     memset(&pingaddr, 0, sizeof(struct sockaddr_in));
     pingaddr.sin_family = AF_INET;
@@ -305,35 +305,31 @@ static void ping(char *host)
 
 extern int ping_main(int argc, char **argv)
 {
+    char *thisarg;
+    
     argc--;
     argv++;
     options = 0;
     /* Parse any options */
-    if (argc < 1) usage(ping_usage);
-
-    while (**argv == '-') {
-        while (*++(*argv))
-            switch (**argv) {
-            case 'c':
-                argc--; argv++;
-                if (argc < 1) usage(ping_usage);
-                pingcount = atoi(*argv);
-                break;
-            case 'q':
-                options |= O_QUIET;
-                break;
-            default:
-                usage(ping_usage);
-            }
-        argc--;
-        argv++;
+    while (argc > 1) {
+        if (**argv != '-') usage(ping_usage);
+        thisarg = *argv; thisarg++;
+        switch (*thisarg) {
+            case 'q': options |= O_QUIET; break;
+            case 'c':
+                argc--; argv++;
+                pingcount = atoi(*argv);                
+                break;
+            default:
+                usage(ping_usage);
+        }
+        argc--; argv++;
     }
-
-    if (argc < 1) usage(ping_usage);
+    if (argc < 1) usage(ping_usage);       
 
     myid = getpid() & 0xFFFF;
-    ping(*(argv++));
-    exit( TRUE);
+    ping(*argv);
+    exit(TRUE);
 }
 
 /*
diff --git a/tail.c b/tail.c
index 058d462a5..7a64c4ca3 100644
--- a/tail.c
+++ b/tail.c
@@ -13,35 +13,16 @@
 
    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"
 
@@ -49,16 +30,25 @@
 #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);
 }
 
@@ -69,7 +59,7 @@ static void error(int i, int errnum, char* fmt, const char *msg)
       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)
 
@@ -110,7 +100,6 @@ enum header_mode
 };
 
 char *xmalloc ();
-int safe_read ();
 
 /* The name this program was run with.  */
 char *program_name;
@@ -118,33 +107,24 @@ 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)
@@ -184,7 +164,7 @@ file_lines (const char *filename, int fd, long int n_lines, off_t pos)
      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);
@@ -220,7 +200,7 @@ file_lines (const char *filename, int fd, long int n_lines, off_t pos)
       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);
@@ -255,7 +235,7 @@ pipe_lines (const char *filename, int fd, long int n_lines)
   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;
@@ -374,7 +354,7 @@ pipe_bytes (const char *filename, int fd, off_t n_bytes)
   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;
 
@@ -453,7 +433,7 @@ 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)
+  while (n_bytes > 0 && (bytes_read = fullRead (fd, buffer, BUFSIZ)) > 0)
     n_bytes -= bytes_read;
   if (bytes_read == -1)
     {
@@ -476,7 +456,7 @@ start_lines (const char *filename, int fd, long int n_lines)
   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)
@@ -509,7 +489,7 @@ dump_remainder (const char *filename, int fd)
 
   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;
@@ -731,7 +711,7 @@ tail_file (const char *filename, off_t n_units, int filenum)
   int fd, errors;
   struct stat stats;
 
-  if (!strcmp (filename, "-")
+  if (!strcmp (filename, "-"))
     {
       have_read_stdin = 1;
       filename = "standard input";
@@ -815,16 +795,15 @@ tail_file (const char *filename, off_t n_units, int filenum)
 }
 
 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;
 
@@ -832,48 +811,38 @@ tai_main (int argc, char **argv)
   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':
@@ -885,26 +854,11 @@ tai_main (int argc, char **argv)
                   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;
@@ -918,8 +872,8 @@ tai_main (int argc, char **argv)
         --n_units;
     }
 
-  n_files = argc - optind;
-  file = argv + optind;
+  n_files = argc;
+  file = argv;
 
   if (n_files > 1 && forever)
     {
diff --git a/utility.c b/utility.c
index 469275f2d..de7a0fbfc 100644
--- a/utility.c
+++ b/utility.c
@@ -289,7 +289,7 @@ const char *modeString(int mode)
 #endif
 
 
-#ifdef BB_TAR
+#if defined BB_TAR
 /*
  * Return the standard ls-like time string from a time_t
  * This is static and so is overwritten on each call.
@@ -340,8 +340,10 @@ int fullWrite(int fd, const char *buf, int len)
 
     return total;
 }
+#endif
 
 
+#if defined BB_TAR || defined BB_TAIL
 /*
  * Read all of the supplied buffer from a file.
  * This does multiple reads as necessary.
@@ -1018,6 +1020,55 @@ extern void whine_if_fstab_is_missing()
 #endif
 
 
+#if defined BB_DD || defined BB_TAIL
+/*
+ * Read a number with a possible multiplier.
+ * Returns -1 if the number format is illegal.
+ */
+extern long getNum (const char *cp)
+{
+    long value;
+
+    if (!isDecimal (*cp))
+        return -1;
+
+    value = 0;
+
+    while (isDecimal (*cp))
+        value = value * 10 + *cp++ - '0';
+
+    switch (*cp++) {
+    case 'm':
+        value *= 1048576;
+        break;
+
+    case 'k':
+        value *= 1024;
+        break;
+
+    case 'b':
+        value *= 512;
+        break;
+
+    case 'w':
+        value *= 2;
+        break;
+
+    case '\0':
+        return value;
+
+    default:
+        return -1;
+    }
+
+    if (*cp)
+        return -1;
+
+    return value;
+}
+#endif
+
+
 /* END CODE */