sys/src/ape/cmd/uname.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <sys/utsname.h>
   4
   5 #define ARGBEGIN        for((argv0=*argv),argv++,argc--;\
   6                             argv[0] && argv[0][0]=='-' && argv[0][1];\
   7                             argc--, argv++) {\
   8                                 char *_args, *_argt, _argc;\
   9                                 _args = &argv[0][1];\
  10                                 if(_args[0]=='-' && _args[1]==0){\
  11                                         argc--; argv++; break;\
  12                                 }\
  13                                 while(*_args) switch(_argc=*_args++)
  14 #define ARGEND          }
  15 #define ARGF()          (_argt=_args, _args="",\
  16                                 (*_argt? _argt: argv[1]? (argc--, *++argv): 0))
  17 #define ARGC()          _argc
  18
  19 char *argv0;
  20
  21 static int started;
  22
  23 static void
  24 prword(char *w)
  25 {
  26         if (started)
  27                 putchar(' ');
  28         else
  29                 started = 1;
  30         fputs(w, stdout);
  31 }
  32
  33 void
  34 main(int argc, char **argv)
  35 {
  36         struct utsname u;
  37
  38         uname(&u);
  39         if(argc == 1){
  40                 printf("%s\n", u.sysname);
  41                 exit(0);
  42         }
  43         ARGBEGIN {
  44         case 'a':
  45                 prword(u.sysname);
  46                 prword(u.nodename);
  47                 prword(u.release);
  48                 prword(u.version);
  49                 prword(u.machine);
  50                 break;
  51         case 'm':
  52                 prword(u.machine);
  53                 break;
  54         case 'n':
  55                 prword(u.nodename);
  56                 break;
  57         case 'r':
  58                 prword(u.release);
  59                 break;
  60         case 's':
  61                 prword(u.sysname);
  62                 break;
  63         case 'v':
  64                 prword(u.version);
  65                 break;
  66         } ARGEND
  67         printf("\n");
  68         exit(0);
  69 }