from the ANSI standard

[unix-history] / usr / src / lib / libc / net / getprotoent.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[] = "@(#)getprotoent.c       5.5 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

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

#define MAXALIASES      35

static char PROTODB[] = "/etc/protocols";
static FILE *protof = NULL;
static char line[BUFSIZ+1];
static struct protoent proto;
static char *proto_aliases[MAXALIASES];
static char *any();
int _proto_stayopen;

setprotoent(f)
       int f;
{
       if (protof == NULL)
               protof = fopen(PROTODB, "r" );
       else
               rewind(protof);
       _proto_stayopen |= f;
}

endprotoent()
{
       if (protof) {
               fclose(protof);
               protof = NULL;
       }
       _proto_stayopen = 0;
}

struct protoent *
getprotoent()
{
       char *p;
       register char *cp, **q;

       if (protof == NULL && (protof = fopen(PROTODB, "r" )) == NULL)
               return (NULL);
again:
       if ((p = fgets(line, BUFSIZ, protof)) == NULL)
               return (NULL);
       if (*p == '#')
               goto again;
       cp = any(p, "#\n");
       if (cp == NULL)
               goto again;
       *cp = '\0';
       proto.p_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';
       proto.p_proto = atoi(cp);
       q = proto.p_aliases = proto_aliases;
       if (p != NULL) {
               cp = p;
               while (cp && *cp) {
                       if (*cp == ' ' || *cp == '\t') {
                               cp++;
                               continue;
                       }
                       if (q < &proto_aliases[MAXALIASES - 1])
                               *q++ = cp;
                       cp = any(cp, " \t");
                       if (cp != NULL)
                               *cp++ = '\0';
               }
       }
       *q = NULL;
       return (&proto);
}

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);
}