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Diffstat (limited to 'utils/showtrans.c')
| -rw-r--r-- | utils/showtrans.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/utils/showtrans.c b/utils/showtrans.c new file mode 100644 index 00000000..dbbada75 --- /dev/null +++ b/utils/showtrans.c @@ -0,0 +1,145 @@ +/* Show files' passive translators. + + Copyright (C) 1995, 1996, 1997, 1998, 1999 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 <version.h> +#include <sys/mman.h> + +#include <error.h> +#include <argz.h> + +const char *argp_program_version = STANDARD_HURD_VERSION (showtrans); + +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}, + {"translated",'t', 0, 0, "Only display files that have translators"}, + {0, 0} +}; + +static char *args_doc = "FILE..."; +static char *doc = "Show the passive translator of FILE..." +"\vA FILE argument of `-' prints the translator on the node" +" attached to standard input."; + +/* ---------------------------------------------------------------- */ + +int +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, show_untrans = 1; + + /* 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) + munmap (trans, trans_len); + + status = 0; + + break; + + case EINVAL: + /* NODE just doesn't have a translator. */ + if (!silent && print_prefix && show_untrans) + 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_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 (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; + case 't': show_untrans = 0; break; + + case ARGP_KEY_NO_ARGS: + argp_usage (state); /* exits */ + + default: + return ARGP_ERR_UNKNOWN; + } + return 0; + } + + struct argp argp = {options, parse_opt, args_doc, doc}; + + argp_parse (&argp, argc, argv, 0, 0, 0); + + return status; +} |