105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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* Copyright (c) 2017 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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* hostname.c
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* Write or set the system hostname.
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*/
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#include <err.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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// TODO: The Sortix <limits.h> doesn't expose this at the moment.
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#if !defined(HOST_NAME_MAX) && defined(__sortix__)
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#include <sortix/limits.h>
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#endif
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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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bool short_hostname = false;
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const char* argv0 = argv[0];
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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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case 's': short_hostname = true; break;
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default:
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fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
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exit(1);
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}
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}
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else if ( !strcmp(arg, "--short") )
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short_hostname = true;
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else
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{
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fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
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exit(1);
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}
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}
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compact_arguments(&argc, &argv);
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if ( 3 <= argc )
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errx(1, "unexpected extra operand");
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if ( argc == 2 )
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{
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if ( short_hostname )
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errx(1, "the -s option is incompatible with setting hostname");
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char* hostname = argv[1];
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if ( sethostname(hostname, strlen(hostname)) < 0 )
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err(1, "sethostname: %s", hostname);
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return 0;
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}
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char hostname[HOST_NAME_MAX + 1];
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if ( gethostname(hostname, sizeof(hostname)) < 0 )
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err(1, "gethostname");
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if ( short_hostname )
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hostname[strcspn(hostname, ".")] = '\0';
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puts(hostname);
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if ( ferror(stdout) || fflush(stdout) == EOF )
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err(1, "stdout");
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return 0;
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}
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