regress/lib/libc/servent/servent.c

   1 #include <netdb.h>
   2 #include <stdint.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5 #include <netinet/in.h>
   6 #include <sys/types.h>
   7 #include <stdio.h>
   8
   9 static void
  10 pserv(const struct servent *svp)
  11 {
  12         char **pp;
  13
  14         printf("name=%s, port=%d, proto=%s, aliases=",
  15             svp->s_name, ntohs((uint16_t)svp->s_port), svp->s_proto);
  16         for (pp = svp->s_aliases; *pp; pp++)
  17                 printf("%s ", *pp);
  18         printf("\n");
  19 }
  20
  21 static void
  22 usage(void)
  23 {
  24         (void)fprintf(stderr, "Usage: %s\n"
  25             "\t%s -p <port> [-P <proto>]\n"
  26             "\t%s -n <name> [-P <proto>]\n", getprogname(), getprogname(),
  27             getprogname());
  28         exit(1);
  29 }
  30
  31 int
  32 main(int argc, char *argv[])
  33 {
  34         struct servent *svp;
  35         const char *port = NULL, *proto = NULL, *name = NULL;
  36         int c;
  37
  38         while ((c = getopt(argc, argv, "p:n:P:")) != -1) {
  39                 switch (c) {
  40                 case 'n':
  41                         name = optarg;
  42                         break;
  43                 case 'p':
  44                         port = optarg;
  45                         break;
  46                 case 'P':
  47                         proto = optarg;
  48                         break;
  49                 default:
  50                         usage();
  51                 }
  52         }
  53
  54         if (port && name)
  55                 usage();
  56         if (port) {
  57                 if ((svp = getservbyport(htons(atoi(port)), proto)) != NULL)
  58                         pserv(svp);
  59                 return 0;
  60         }
  61         if (name) {
  62                 if ((svp = getservbyname(name, proto)) != NULL)
  63                         pserv(svp);
  64                 return 0;
  65         }
  66
  67         setservent(0);
  68         while ((svp = getservent()) != NULL)
  69                 pserv(svp);
  70         endservent();
  71         return 0;
  72 }