Add comment about what other letters are used.

[chaz/tar] / src / rmt.c

diff --git a/src/rmt.c b/src/rmt.c
index 8e9ad8433a8da83d333b17559a65110ae7ab4ded..f487b2c39e3ec3e7394adf03b729f7c18632147b 100644 (file)
--- a/src/rmt.c
+++ b/src/rmt.c
@@ -1,5 +1,7 @@
 /* Remote connection server.
-   Copyright 1994, 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
+
+   Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2003 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
@@ -30,8 +32,11 @@
    MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  */
 
 #include "system.h"
-#include "safe-read.h"
+#include <localedir.h>
+#include <safe-read.h>
+#include <full-write.h>
 
+#include <getopt.h>
 #include <sys/socket.h>
 
 #ifndef EXIT_FAILURE
@@ -70,10 +75,7 @@ static FILE *debug_file;
 #define        DEBUG2(File, Arg1, Arg2) \
   if (debug_file) fprintf(debug_file, File, Arg1, Arg2)
 
-/*------------------------------------------------.
-| Return an error string, given an error number.  |
-`------------------------------------------------*/
-
+/* Return an error string, given an error number.  */
 #if HAVE_STRERROR
 # ifndef strerror
 char *strerror ();
@@ -92,10 +94,6 @@ private_strerror (int errnum)
 # define strerror private_strerror
 #endif
 
-/*---.
-| ?  |
-`---*/
-
 static void
 report_error_message (const char *string)
 {
@@ -105,10 +103,6 @@ report_error_message (const char *string)
   full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer));
 }
 
-/*---.
-| ?  |
-`---*/
-
 static void
 report_numbered_error (int num)
 {
@@ -118,10 +112,6 @@ report_numbered_error (int num)
   full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer));
 }
 
-/*---.
-| ?  |
-`---*/
-
 static void
 get_string (char *string)
 {
@@ -138,12 +128,8 @@ get_string (char *string)
   string[counter] = '\0';
 }
 
-/*---.
-| ?  |
-`---*/
-
 static void
-prepare_record_buffer (size_t size)
+prepare_input_buffer (int fd, size_t size)
 {
   if (size <= allocated_size)
     return;
@@ -164,14 +150,14 @@ prepare_record_buffer (size_t size)
   allocated_size = size;
 
 #ifdef SO_RCVBUF
-  while (size > 1024 &&
-        (setsockopt (STDIN_FILENO, SOL_SOCKET, SO_RCVBUF,
-                     (char *) &size, sizeof size)
-         < 0))
-    size -= 1024;
-#else
-  /* FIXME: I do not see any purpose to the following line...  Sigh! */
-  size = 1 + ((size - 1) % 1024);
+  if (0 <= fd)
+    {
+      int isize = size < INT_MAX ? size : INT_MAX;
+      while (setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
+                        (char *) &isize, sizeof isize)
+            && 1024 < isize)
+       isize >>= 1;
+    }
 #endif
 }
 
@@ -203,7 +189,9 @@ decode_oflag (char const *oflag_string)
       struct name_value_pair { char const *name; int value; };
       static struct name_value_pair const table[] =
       {
+#ifdef O_APPEND
        {"APPEND", O_APPEND},
+#endif
        {"CREAT", O_CREAT},
 #ifdef O_DSYNC
        {"DSYNC", O_DSYNC},
@@ -252,9 +240,33 @@ decode_oflag (char const *oflag_string)
   return symbolic_oflag;
 }
 
-/*---.
-| ?  |
-`---*/
+static struct option const long_opts[] =
+{
+  {"help", no_argument, 0, 'h'},
+  {"version", no_argument, 0, 'v'},
+  {0, 0, 0, 0}
+};
+
+static void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    fprintf (stderr, _("Try `%s --help' for more information.\n"),
+            program_name);
+  else
+    {
+      printf (_("\
+Usage: %s [OPTION]\n\
+Manipulate a tape drive, accepting commands from a remote process.\n\
+\n\
+  --version  Output version info.\n\
+  --help  Output this help.\n"),
+             program_name);
+      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+    }
+
+  exit (status);
+}
 
 int
 main (int argc, char *const *argv)
@@ -271,12 +283,34 @@ main (int argc, char *const *argv)
   bindtextdomain (PACKAGE, LOCALEDIR);
   textdomain (PACKAGE);
 
-  /* FIXME: Implement --help and --version as for any other GNU program.  */
+  switch (getopt_long (argc, argv, "", long_opts, NULL))
+    {
+    default:
+      usage (EXIT_FAILURE);
+      
+    case 'h':
+      usage (EXIT_SUCCESS);
+      
+    case 'v':
+      {
+       printf ("rmt (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION);
+       printf (_("Copyright (C) %d Free Software Foundation, Inc.\n"), 2003);
+       puts (_("\
+This program comes with NO WARRANTY, to the extent permitted by law.\n\
+You may redistribute it under the terms of the GNU General Public License;\n\
+see the file named COPYING for details."));
+      }
+      return EXIT_SUCCESS;
+
+    case -1:
+      break;
+    }
 
-  argc--, argv++;
-  if (argc > 0)
+  if (optind < argc)
     {
-      debug_file = fopen (*argv, "w");
+      if (optind != argc - 1)
+       usage (EXIT_FAILURE);
+      debug_file = fopen (argv[optind], "w");
       if (debug_file == 0)
        {
          report_numbered_error (errno);
@@ -286,10 +320,10 @@ main (int argc, char *const *argv)
     }
 
 top:
-  errno = 0;                   /* FIXME: errno should be read-only */
+  errno = 0;
   status = 0;
   if (safe_read (STDIN_FILENO, &command, 1) != 1)
-    exit (EXIT_SUCCESS);
+    return EXIT_SUCCESS;
 
   switch (command)
     {
@@ -405,7 +439,7 @@ top:
        size = atol (count_string);
        DEBUG1 ("rmtd: W %s\n", count_string);
 
-       prepare_record_buffer (size);
+       prepare_input_buffer (STDIN_FILENO, size);
        for (counter = 0; counter < size; counter += status)
          {
            status = safe_read (STDIN_FILENO, &record_buffer[counter],
@@ -433,7 +467,7 @@ top:
        DEBUG1 ("rmtd: R %s\n", count_string);
 
        size = atol (count_string);
-       prepare_record_buffer (size);
+       prepare_input_buffer (-1, size);
        status = safe_read (tape, record_buffer, size);
        if (status < 0)
          goto ioerror;