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/* Show files' passive translators.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <argp.h>
#include <fcntl.h>
#include <unistd.h>
#include <error.h>
#include <argz.h>
static struct argp_option options[] =
{
{"prefix", 'p', 0, 0, "always display `FILENAME: ' before translators"},
{"no-prefix", 'P', 0, 0, "never display `FILENAME: ' before translators"},
{"silent", 's', 0, 0, "no output; useful when checking error status"},
{"quiet", 'q', 0, OPTION_ALIAS | OPTION_HIDDEN},
{0, 0}
};
static char *args_doc = "FILE...";
static char *doc = "If there are no args, the translator on the node attached \
to standard input is printed. A FILE argument of `-' also does this.";
/* ---------------------------------------------------------------- */
void
main (int argc, char *argv[])
{
/* The default exit status -- changed to 0 if we find any translators. */
int status = 1;
/* Some option flags. -1 for PRINT_PREFIX means use the default. */
int print_prefix = -1, silent = 0;
/* If NODE is MACH_PORT_NULL, prints an error message and exits, otherwise
prints the translator on NODE, possibly prefixed by `NAME:', and
deallocates NODE. */
void print_node_trans (file_t node, char *name)
{
if (node == MACH_PORT_NULL)
error (0, errno, "%s", name);
else
{
char buf[1024], *trans = buf;
int trans_len = sizeof (buf);
error_t err = file_get_translator (node, &trans, &trans_len);
switch (err)
{
case 0:
/* Make the '\0's in TRANS printable. */
argz_stringify (trans, trans_len, ' ');
if (!silent)
if (print_prefix)
printf ("%s: %s\n", name, trans);
else
puts (trans);
if (trans != buf)
vm_deallocate (mach_task_self (),
(vm_address_t)trans, trans_len);
status = 0;
break;
case EINVAL:
/* NODE just doesn't have a translator. */
if (!silent && print_prefix)
puts (name);
break;
default:
error (0, err, "%s", name);
}
mach_port_deallocate (mach_task_self (), node);
}
}
/* Parse a command line option. */
error_t parse_opt (int key, char *arg, struct argp_state *state)
{
switch (key)
{
case ARGP_KEY_NO_ARGS: /* The end of the argument list */
case ARGP_KEY_ARG: /* A FILE argument */
if (print_prefix < 0)
/* By default, only print a prefix if there are multiple files. */
print_prefix = state->next < state->argc;
if (arg && strcmp (arg, "-") != 0)
print_node_trans (file_name_lookup (arg, O_NOTRANS, 0), arg);
else
print_node_trans (getdport (0), "-");
break;
/* Options. */
case 'p': print_prefix = 1; break;
case 'P': print_prefix = 0; break;
case 's': case 'q': silent = 1; break;
default: return EINVAL;
}
return 0;
}
struct argp argp = {options, parse_opt, args_doc, doc};
argp_parse (&argp, argc, argv, 0, 0, 0);
exit (status);
}
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