Commit dc449934 authored by Jonas Termansen's avatar Jonas Termansen

Add tty(1).

parent 52ea22d7
......@@ -49,6 +49,7 @@ time
touch
tr
true
tty
type
uname
uniq
......
......@@ -60,6 +60,7 @@ time \
touch \
tr \
true \
tty \
type \
uname \
uniq \
......
/*
* Copyright (c) 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* tty.c
* Print terminal's name.
*/
#include <err.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
int main(int argc, char* argv[])
{
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
char c;
while ( (c = *++arg) ) switch ( c )
{
default:
errx(2, "unknown option -- '%c'", c);
}
}
else
errx(2, "unknown option: %s", arg);
}
compact_arguments(&argc, &argv);
if ( 1 < argc )
errx(1, "unexpected extra operand");
char* name = ttyname(0);
if ( !name && errno != ENOTTY )
err(2, "ttyname");
puts(name ? name : "not a tty");
if ( ferror(stdout) || fflush(stdout) == EOF )
return 2;
return name ? 1 : 0;
}
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