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Annotation of 43BSD/lib/libc/net/hosttable/gethostent.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #if defined(LIBC_SCCS) && !defined(lint)
        !             8: static char sccsid[] = "@(#)gethostent.c       5.3 (Berkeley) 3/9/86";
        !             9: #endif LIBC_SCCS and not lint
        !            10: 
        !            11: #include <stdio.h>
        !            12: #include <sys/types.h>
        !            13: #include <sys/socket.h>
        !            14: #include <netdb.h>
        !            15: #include <ctype.h>
        !            16: #include <ndbm.h>
        !            17: 
        !            18: /*
        !            19:  * Internet version.
        !            20:  */
        !            21: #define        MAXALIASES      35
        !            22: #define        MAXADDRSIZE     14
        !            23: 
        !            24: static FILE *hostf = NULL;
        !            25: static char line[BUFSIZ+1];
        !            26: static char hostaddr[MAXADDRSIZE];
        !            27: static struct hostent host;
        !            28: static char *host_aliases[MAXALIASES];
        !            29: static char *host_addrs[] = {
        !            30:        hostaddr,
        !            31:        NULL
        !            32: };
        !            33: 
        !            34: /*
        !            35:  * The following is shared with gethostnamadr.c
        !            36:  */
        !            37: char   *_host_file = "/etc/hosts";
        !            38: int    _host_stayopen;
        !            39: DBM    *_host_db;      /* set by gethostbyname(), gethostbyaddr() */
        !            40: 
        !            41: static char *any();
        !            42: 
        !            43: sethostent(f)
        !            44:        int f;
        !            45: {
        !            46:        if (hostf != NULL)
        !            47:                rewind(hostf);
        !            48:        _host_stayopen |= f;
        !            49: }
        !            50: 
        !            51: endhostent()
        !            52: {
        !            53:        if (hostf) {
        !            54:                fclose(hostf);
        !            55:                hostf = NULL;
        !            56:        }
        !            57:        if (_host_db) {
        !            58:                dbm_close(_host_db);
        !            59:                _host_db = (DBM *)NULL;
        !            60:        }
        !            61:        _host_stayopen = 0;
        !            62: }
        !            63: 
        !            64: struct hostent *
        !            65: gethostent()
        !            66: {
        !            67:        char *p;
        !            68:        register char *cp, **q;
        !            69: 
        !            70:        if (hostf == NULL && (hostf = fopen(_host_file, "r" )) == NULL)
        !            71:                return (NULL);
        !            72: again:
        !            73:        if ((p = fgets(line, BUFSIZ, hostf)) == NULL)
        !            74:                return (NULL);
        !            75:        if (*p == '#')
        !            76:                goto again;
        !            77:        cp = any(p, "#\n");
        !            78:        if (cp == NULL)
        !            79:                goto again;
        !            80:        *cp = '\0';
        !            81:        cp = any(p, " \t");
        !            82:        if (cp == NULL)
        !            83:                goto again;
        !            84:        *cp++ = '\0';
        !            85:        /* THIS STUFF IS INTERNET SPECIFIC */
        !            86:        host.h_addr_list = host_addrs;
        !            87:        *((u_long *)host.h_addr) = inet_addr(p);
        !            88:        host.h_length = sizeof (u_long);
        !            89:        host.h_addrtype = AF_INET;
        !            90:        while (*cp == ' ' || *cp == '\t')
        !            91:                cp++;
        !            92:        host.h_name = cp;
        !            93:        q = host.h_aliases = host_aliases;
        !            94:        cp = any(cp, " \t");
        !            95:        if (cp != NULL) 
        !            96:                *cp++ = '\0';
        !            97:        while (cp && *cp) {
        !            98:                if (*cp == ' ' || *cp == '\t') {
        !            99:                        cp++;
        !           100:                        continue;
        !           101:                }
        !           102:                if (q < &host_aliases[MAXALIASES - 1])
        !           103:                        *q++ = cp;
        !           104:                cp = any(cp, " \t");
        !           105:                if (cp != NULL)
        !           106:                        *cp++ = '\0';
        !           107:        }
        !           108:        *q = NULL;
        !           109:        return (&host);
        !           110: }
        !           111: 
        !           112: sethostfile(file)
        !           113:        char *file;
        !           114: {
        !           115:        _host_file = file;
        !           116: }
        !           117: 
        !           118: static char *
        !           119: any(cp, match)
        !           120:        register char *cp;
        !           121:        char *match;
        !           122: {
        !           123:        register char *mp, c;
        !           124: 
        !           125:        while (c = *cp) {
        !           126:                for (mp = match; *mp; mp++)
        !           127:                        if (*mp == c)
        !           128:                                return (cp);
        !           129:                cp++;
        !           130:        }
        !           131:        return ((char *)0);
        !           132: }

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