BSD 4_3_Net_1 release

[unix-history] / lib / libc / net / getservent.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[] = "@(#)getservent.c        5.6 (Berkeley) 6/27/88";
#endif /* LIBC_SCCS and not lint */

#include <stdio.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <ctype.h>

#define MAXALIASES      35

static char SERVDB[] = "/etc/services";
static FILE *servf = NULL;
static char line[BUFSIZ+1];
static struct servent serv;
static char *serv_aliases[MAXALIASES];
static char *any();
int _serv_stayopen;

setservent(f)
       int f;
{
       if (servf == NULL)
               servf = fopen(SERVDB, "r" );
       else
               rewind(servf);
       _serv_stayopen |= f;
}

endservent()
{
       if (servf) {
               fclose(servf);
               servf = NULL;
       }
       _serv_stayopen = 0;
}

struct servent *
getservent()
{
       char *p;
       register char *cp, **q;

       if (servf == NULL && (servf = fopen(SERVDB, "r" )) == NULL)
               return (NULL);
again:
       if ((p = fgets(line, BUFSIZ, servf)) == NULL)
               return (NULL);
       if (*p == '#')
               goto again;
       cp = any(p, "#\n");
       if (cp == NULL)
               goto again;
       *cp = '\0';
       serv.s_name = p;
       p = any(p, " \t");
       if (p == NULL)
               goto again;
       *p++ = '\0';
       while (*p == ' ' || *p == '\t')
               p++;
       cp = any(p, ",/");
       if (cp == NULL)
               goto again;
       *cp++ = '\0';
       serv.s_port = htons((u_short)atoi(p));
       serv.s_proto = cp;
       q = serv.s_aliases = serv_aliases;
       cp = any(cp, " \t");
       if (cp != NULL)
               *cp++ = '\0';
       while (cp && *cp) {
               if (*cp == ' ' || *cp == '\t') {
                       cp++;
                       continue;
               }
               if (q < &serv_aliases[MAXALIASES - 1])
                       *q++ = cp;
               cp = any(cp, " \t");
               if (cp != NULL)
                       *cp++ = '\0';
       }
       *q = NULL;
       return (&serv);
}

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);
}