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#include <stdio.h>
#include <stdlib.h>
#include <sys/utsname.h>
#define ARGBEGIN for((argv0=*argv),argv++,argc--;\
argv[0] && argv[0][0]=='-' && argv[0][1];\
argc--, argv++) {\
char *_args, *_argt, _argc;\
_args = &argv[0][1];\
if(_args[0]=='-' && _args[1]==0){\
argc--; argv++; break;\
}\
while(*_args) switch(_argc=*_args++)
#define ARGEND }
#define ARGF() (_argt=_args, _args="",\
(*_argt? _argt: argv[1]? (argc--, *++argv): 0))
#define ARGC() _argc
char *argv0;
static int started;
static void
prword(char *w)
{
if (started)
putchar(' ');
else
started = 1;
fputs(w, stdout);
}
main(int argc, char **argv)
{
struct utsname u;
uname(&u);
if(argc == 1){
printf("%s\n", u.sysname);
exit(0);
}
ARGBEGIN {
case 'a':
prword(u.sysname);
prword(u.nodename);
prword(u.release);
prword(u.version);
prword(u.machine);
break;
case 'm':
prword(u.machine);
break;
case 'n':
prword(u.nodename);
break;
case 'r':
prword(u.release);
break;
case 's':
prword(u.sysname);
break;
case 'v':
prword(u.version);
break;
} ARGEND
printf("\n");
exit(0);
}
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