apps/fibo/main.c

   1 /*
   2 ** Copyright 2002, Manuel J. Petit. All rights reserved.
   3 ** Distributed under the terms of the NewOS License.
   4 */
   5
   6 #include <string.h>
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9 #include <sys/syscalls.h>
  10
  11 static
  12 void
  13 usage(char const *app)
  14 {
  15         printf("usage: %s [-s] ###\n", app);
  16         exit(-1);
  17 }
  18
  19 int
  20 main(int argc, char *argv[])
  21 {
  22         int num= 0;
  23         int silent= 0;
  24         int result;
  25
  26         switch(argc) {
  27                 case 2:
  28                         num= atoi(argv[1]);
  29                         break;
  30                 case 3:
  31                         if(strcmp(argv[1], "-s")== 0) {
  32                                 num= atoi(argv[2]);
  33                                 silent= 1;
  34                         } else {
  35                                 usage(argv[0]);
  36                         }
  37                         break;
  38                 default:
  39                         usage(argv[0]);
  40                         break;
  41         }
  42
  43         if(num< 2) {
  44                 result= 1;
  45         } else {
  46                 proc_id pid;
  47                 int retcode;
  48                 char buffer[64];
  49                 char *aaargv[]= { argv[0], "-s", buffer, NULL };
  50                 int  aaargc= 3;
  51
  52                 sprintf(buffer, "%d", num-1);
  53                 pid= _kern_proc_create_proc(aaargv[0], aaargv[0], aaargv, aaargc, 5, 0);
  54                 _kern_proc_wait_on_proc(pid, &retcode);
  55                 result= retcode;
  56
  57                 sprintf(buffer, "%d", num-2);
  58                 pid= _kern_proc_create_proc(aaargv[0], aaargv[0], aaargv, aaargc, 5, 0);
  59                 _kern_proc_wait_on_proc(pid, &retcode);
  60                 result+= retcode;
  61         }
  62
  63         if(silent) {
  64                 return result;
  65         } else {
  66                 printf("%d\n", result);
  67                 return 0;
  68         }
  69 }