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getnetent.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getnetent.c   5.5 (Berkeley) 6/27/88";
#endif /* LIBC_SCCS and not lint */

#include "inetprivate.h"

#define     MAXALIASES  35

static char NETDB[] = _PATH_NETWORKS;
static FILE *netf = NULL;
static char line[BUFSIZ+1];
static struct netent net;
static char *net_aliases[MAXALIASES];
static char *any(char *, char *);

int _net_stayopen;
extern u_int32_t inet_network(const char *cp);

void
setnetent(f)
      int f;
{
      if (netf == NULL)
            netf = fopen(NETDB, "r" );
      else
            rewind(netf);
      _net_stayopen |= f;
}

void
endnetent()
{
      if (netf) {
            fclose(netf);
            netf = NULL;
      }
      _net_stayopen = 0;
}

struct netent *
getnetent()
{
      char *p;
      register char *cp, **q;

      if (netf == NULL && (netf = fopen(NETDB, "r" )) == NULL)
            return (NULL);
again:
      p = fgets(line, BUFSIZ, netf);
      if (p == NULL)
            return (NULL);
      if (*p == '#')
            goto again;
      cp = any(p, "#\n");
      if (cp == NULL)
            goto again;
      *cp = '\0';
      net.n_name = p;
      cp = any(p, " \t");
      if (cp == NULL)
            goto again;
      *cp++ = '\0';
      while (*cp == ' ' || *cp == '\t')
            cp++;
      p = any(cp, " \t");
      if (p != NULL)
            *p++ = '\0';
      net.n_net = inet_network(cp);
      net.n_addrtype = AF_INET;
      q = net.n_aliases = net_aliases;
      if (p != NULL) 
            cp = p;
      while (cp && *cp) {
            if (*cp == ' ' || *cp == '\t') {
                  cp++;
                  continue;
            }
            if (q < &net_aliases[MAXALIASES - 1])
                  *q++ = cp;
            cp = any(cp, " \t");
            if (cp != NULL)
                  *cp++ = '\0';
      }
      *q = NULL;
      return (&net);
}

static char *
any(cp, match)
      register char *cp;
      char *match;
{
      register char *mp, c;

      while (c = *cp) {
            for (mp = match; *mp; mp++)
                  if (*mp == c)
                        return (cp);
            cp++;
      }
      return ((char *)0);
}

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