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/*
* UNG's Not GNU
*
* Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _POSIX_C_SOURCE 2
#include <locale.h>
#include <stdio.h>
#include <sys/utsname.h>
#include <unistd.h>
enum {
MACHINE = 1<<0,
NODENAME = 1<<1,
RELEASE = 1<<2,
SYSNAME = 1<<3,
VERSION = 1<<4
};
unsigned int print(unsigned int flags, unsigned int field, const char *name)
{
if (flags & field) {
printf("%s", name);
flags = flags & ~field;
if (flags) {
putchar(' ');
}
}
return flags;
}
int main(int argc, char *argv[])
{
setlocale(LC_ALL, "");
unsigned int show = 0;
int c;
while ((c = getopt(argc, argv, "amnrsv")) != -1) {
switch (c) {
case 'a':
show = MACHINE | NODENAME | RELEASE | SYSNAME | VERSION;
break;
case 'm':
show |= MACHINE;
break;
case 'n':
show |= NODENAME;
break;
case 'r':
show |= RELEASE;
break;
case 's':
show |= SYSNAME;
break;
case 'v':
show |= VERSION;
break;
default:
return 1;
}
}
if (optind < argc) {
fprintf(stderr, "uname: invalid operand %s\n", argv[optind]);
return 1;
}
if (show == 0) {
show = SYSNAME;
}
struct utsname uts;
uname(&uts);
show = print(show, SYSNAME, uts.sysname);
show = print(show, NODENAME, uts.nodename);
show = print(show, RELEASE, uts.release);
show = print(show, VERSION, uts.version);
show = print(show, MACHINE, uts.machine);
putchar('\n');
return 0;
}
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