lib/ip/getprotoent.c

   1 /*
   2  * Copyright (c) 1983 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that: (1) source distributions retain this entire copyright
   7  * notice and comment, and (2) distributions including binaries display
   8  * the following acknowledgement:  ``This product includes software
   9  * developed by the University of California, Berkeley and its contributors''
  10  * in the documentation or other materials provided with the distribution
  11  * and in all advertising materials mentioning features or use of this
  12  * software. Neither the name of the University nor the names of its
  13  * contributors may be used to endorse or promote products derived
  14  * from this software without specific prior written permission.
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  */
  19
  20 #if defined(LIBC_SCCS) && !defined(lint)
  21 static char sccsid[] = "@(#)getprotoent.c       5.7 (Berkeley) 6/1/90";
  22 #endif /* LIBC_SCCS and not lint */
  23
  24 #include <ctype.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27
  28 #ifdef _MINIX
  29 #include <net/gen/netdb.h>
  30
  31 static char *any _ARGS(( char *cp, char *match ));
  32 #endif
  33
  34 #define MAXALIASES      35
  35
  36 static FILE *protof = NULL;
  37 static char line[BUFSIZ+1];
  38 static struct protoent proto;
  39 static char *proto_aliases[MAXALIASES];
  40 int _proto_stayopen;
  41
  42 void
  43 setprotoent(f)
  44         int f;
  45 {
  46         if (protof == NULL)
  47                 protof = fopen(_PATH_PROTOCOLS, "r" );
  48         else
  49                 rewind(protof);
  50         _proto_stayopen |= f;
  51 }
  52
  53 void
  54 endprotoent()
  55 {
  56         if (protof) {
  57                 fclose(protof);
  58                 protof = NULL;
  59         }
  60         _proto_stayopen = 0;
  61 }
  62
  63 struct protoent *
  64 getprotoent()
  65 {
  66         char *p;
  67         register char *cp, **q;
  68
  69         if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
  70                 return (NULL);
  71 again:
  72         if ((p = fgets(line, BUFSIZ, protof)) == NULL)
  73                 return (NULL);
  74         if (*p == '#')
  75                 goto again;
  76         cp = any(p, "#\n");
  77         if (cp == NULL)
  78                 goto again;
  79         *cp = '\0';
  80         proto.p_name = p;
  81         cp = any(p, " \t");
  82         if (cp == NULL)
  83                 goto again;
  84         *cp++ = '\0';
  85         while (*cp == ' ' || *cp == '\t')
  86                 cp++;
  87         p = any(cp, " \t");
  88         if (p != NULL)
  89                 *p++ = '\0';
  90         proto.p_proto = atoi(cp);
  91         q = proto.p_aliases = proto_aliases;
  92         if (p != NULL) {
  93                 cp = p;
  94                 while (cp && *cp) {
  95                         if (*cp == ' ' || *cp == '\t') {
  96                                 cp++;
  97                                 continue;
  98                         }
  99                         if (q < &proto_aliases[MAXALIASES - 1])
 100                                 *q++ = cp;
 101                         cp = any(cp, " \t");
 102                         if (cp != NULL)
 103                                 *cp++ = '\0';
 104                 }
 105         }
 106         *q = NULL;
 107         return (&proto);
 108 }
 109
 110 static char *
 111 any(cp, match)
 112         register char *cp;
 113         char *match;
 114 {
 115         register char *mp, c;
 116
 117         while (c = *cp) {
 118                 for (mp = match; *mp; mp++)
 119                         if (*mp == c)
 120                                 return (cp);
 121                 cp++;
 122         }
 123         return ((char *)0);
 124 }