1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #if defined(LIBC_SCCS) && !defined(lint)
9 static char sccsid[] = "@(#)getprotoent.c 8.1 (Berkeley) 06/04/93";
10 #endif /* LIBC_SCCS and not lint */
11
12 #include <sys/types.h>
13 #include <sys/socket.h>
14 #include <netdb.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <string.h>
18
19 #define MAXALIASES 35
20
21 static FILE *protof = NULL;
22 static char line[BUFSIZ+1];
23 static struct protoent proto;
24 static char *proto_aliases[MAXALIASES];
25 int _proto_stayopen;
26
27 void
setprotoent(f)28 setprotoent(f)
29 int f;
30 {
31 if (protof == NULL)
32 protof = fopen(_PATH_PROTOCOLS, "r" );
33 else
34 rewind(protof);
35 _proto_stayopen |= f;
36 }
37
38 void
endprotoent()39 endprotoent()
40 {
41 if (protof) {
42 fclose(protof);
43 protof = NULL;
44 }
45 _proto_stayopen = 0;
46 }
47
48 struct protoent *
getprotoent()49 getprotoent()
50 {
51 char *p;
52 register char *cp, **q;
53
54 if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
55 return (NULL);
56 again:
57 if ((p = fgets(line, BUFSIZ, protof)) == NULL)
58 return (NULL);
59 if (*p == '#')
60 goto again;
61 cp = strpbrk(p, "#\n");
62 if (cp == NULL)
63 goto again;
64 *cp = '\0';
65 proto.p_name = p;
66 cp = strpbrk(p, " \t");
67 if (cp == NULL)
68 goto again;
69 *cp++ = '\0';
70 while (*cp == ' ' || *cp == '\t')
71 cp++;
72 p = strpbrk(cp, " \t");
73 if (p != NULL)
74 *p++ = '\0';
75 proto.p_proto = atoi(cp);
76 q = proto.p_aliases = proto_aliases;
77 if (p != NULL) {
78 cp = p;
79 while (cp && *cp) {
80 if (*cp == ' ' || *cp == '\t') {
81 cp++;
82 continue;
83 }
84 if (q < &proto_aliases[MAXALIASES - 1])
85 *q++ = cp;
86 cp = strpbrk(cp, " \t");
87 if (cp != NULL)
88 *cp++ = '\0';
89 }
90 }
91 *q = NULL;
92 return (&proto);
93 }
94