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