projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 5e649950 | 1 | /* gethostent.c 4.2 82/10/05 */ |
| bcb2abaf SL |
2 | |
| 3 | #include <stdio.h> | |
| 5e649950 | 4 | #include <sys/types.h> |
| bcb2abaf SL |
5 | #include <sys/socket.h> |
| 6 | #include <netdb.h> | |
| 7 | #include <ctype.h> | |
| 8 | ||
| 5e649950 SL |
9 | /* |
| 10 | * Internet version. | |
| 11 | */ | |
| bcb2abaf | 12 | #define MAXALIASES 35 |
| 5e649950 | 13 | #define MAXADDRSIZE 14 |
| bcb2abaf SL |
14 | |
| 15 | static char HOSTDB[] = "/usr/lib/hosts"; | |
| 16 | static FILE *hostf = NULL; | |
| 17 | static char line[BUFSIZ+1]; | |
| 5e649950 | 18 | static char hostaddr[MAXADDRSIZE]; |
| bcb2abaf SL |
19 | static struct hostent host; |
| 20 | static char *host_aliases[MAXALIASES]; | |
| 21 | static int stayopen = 0; | |
| bcb2abaf SL |
22 | static char *any(); |
| 23 | ||
| 24 | sethostent(f) | |
| 25 | int f; | |
| 26 | { | |
| 27 | if (hostf == NULL) | |
| 28 | hostf = fopen(HOSTDB, "r" ); | |
| 29 | else | |
| 30 | rewind(hostf); | |
| 31 | stayopen |= f; | |
| 32 | } | |
| 33 | ||
| 34 | endhostent() | |
| 35 | { | |
| 36 | if (hostf && !stayopen) { | |
| 37 | fclose(hostf); | |
| 38 | hostf = NULL; | |
| 39 | } | |
| 40 | } | |
| 41 | ||
| 42 | struct hostent * | |
| 43 | gethostent() | |
| 44 | { | |
| 45 | char *p; | |
| 46 | register char *cp, **q; | |
| 47 | ||
| 48 | if (hostf == NULL && (hostf = fopen(HOSTDB, "r" )) == NULL) | |
| 49 | return (NULL); | |
| 50 | again: | |
| 51 | if ((p = fgets(line, BUFSIZ, hostf)) == NULL) | |
| 52 | return (NULL); | |
| 53 | if (*p == '#') | |
| 54 | goto again; | |
| 55 | cp = any(p, "#\n"); | |
| 56 | if (cp == NULL) | |
| 57 | goto again; | |
| 58 | *cp = '\0'; | |
| 59 | cp = any(p, " \t"); | |
| 60 | if (cp == NULL) | |
| 61 | goto again; | |
| 62 | *cp++ = '\0'; | |
| 5e649950 SL |
63 | /* THIS STUFF IS INTERNET SPECIFIC */ |
| 64 | host.h_addr = hostaddr; | |
| 65 | *((u_long *)host.h_addr) = inet_addr(p); | |
| 66 | host.h_length = sizeof (u_long); | |
| 67 | host.h_addrtype = AF_INET; | |
| bcb2abaf SL |
68 | while (*cp == ' ' || *cp == '\t') |
| 69 | cp++; | |
| 70 | host.h_name = cp; | |
| bcb2abaf SL |
71 | host.h_aliases = host_aliases; |
| 72 | cp = any(cp, " \t"); | |
| 73 | if (cp != NULL) | |
| 74 | *cp++ = '\0'; | |
| 75 | q = host_aliases; | |
| 76 | while (*cp) { | |
| 77 | if (*cp == ' ' || *cp == '\t') { | |
| 78 | cp++; | |
| 79 | continue; | |
| 80 | } | |
| 81 | if (q < &host_aliases[MAXALIASES - 1]) | |
| 82 | *q++ = cp; | |
| 83 | cp = any(cp, " \t"); | |
| 84 | if (*cp != NULL) | |
| 85 | *cp++ = '\0'; | |
| 86 | } | |
| 87 | *q = NULL; | |
| 88 | return (&host); | |
| 89 | } | |
| 90 | ||
| bcb2abaf SL |
91 | static char * |
| 92 | any(cp, match) | |
| 93 | register char *cp; | |
| 94 | char *match; | |
| 95 | { | |
| 96 | register char *mp, c; | |
| 97 | ||
| 98 | while (c = *cp) { | |
| 99 | for (mp = match; *mp; mp++) | |
| 100 | if (*mp == c) | |
| 101 | return (cp); | |
| 102 | cp++; | |
| 103 | } | |
| 104 | return ((char *)0); | |
| 105 | } |