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Annotation of 43BSDTahoe/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.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #if defined(LIBC_SCCS) && !defined(lint)
        !            19: static char sccsid[] = "@(#)gethostent.c       5.5 (Berkeley) 6/27/88";
        !            20: #endif /* LIBC_SCCS and not lint */
        !            21: 
        !            22: #include <stdio.h>
        !            23: #include <sys/types.h>
        !            24: #include <sys/socket.h>
        !            25: #include <netdb.h>
        !            26: #include <ctype.h>
        !            27: #include <ndbm.h>
        !            28: 
        !            29: /*
        !            30:  * Internet version.
        !            31:  */
        !            32: #define        MAXALIASES      35
        !            33: #define        MAXADDRSIZE     14
        !            34: 
        !            35: static FILE *hostf = NULL;
        !            36: static char line[BUFSIZ+1];
        !            37: static char hostaddr[MAXADDRSIZE];
        !            38: static struct hostent host;
        !            39: static char *host_aliases[MAXALIASES];
        !            40: static char *host_addrs[] = {
        !            41:        hostaddr,
        !            42:        NULL
        !            43: };
        !            44: 
        !            45: /*
        !            46:  * The following is shared with gethostnamadr.c
        !            47:  */
        !            48: char   *_host_file = "/etc/hosts";
        !            49: int    _host_stayopen;
        !            50: DBM    *_host_db;      /* set by gethostbyname(), gethostbyaddr() */
        !            51: 
        !            52: static char *any();
        !            53: 
        !            54: sethostent(f)
        !            55:        int f;
        !            56: {
        !            57:        if (hostf != NULL)
        !            58:                rewind(hostf);
        !            59:        _host_stayopen |= f;
        !            60: }
        !            61: 
        !            62: endhostent()
        !            63: {
        !            64:        if (hostf) {
        !            65:                fclose(hostf);
        !            66:                hostf = NULL;
        !            67:        }
        !            68:        if (_host_db) {
        !            69:                dbm_close(_host_db);
        !            70:                _host_db = (DBM *)NULL;
        !            71:        }
        !            72:        _host_stayopen = 0;
        !            73: }
        !            74: 
        !            75: struct hostent *
        !            76: gethostent()
        !            77: {
        !            78:        char *p;
        !            79:        register char *cp, **q;
        !            80: 
        !            81:        if (hostf == NULL && (hostf = fopen(_host_file, "r" )) == NULL)
        !            82:                return (NULL);
        !            83: again:
        !            84:        if ((p = fgets(line, BUFSIZ, hostf)) == NULL)
        !            85:                return (NULL);
        !            86:        if (*p == '#')
        !            87:                goto again;
        !            88:        cp = any(p, "#\n");
        !            89:        if (cp == NULL)
        !            90:                goto again;
        !            91:        *cp = '\0';
        !            92:        cp = any(p, " \t");
        !            93:        if (cp == NULL)
        !            94:                goto again;
        !            95:        *cp++ = '\0';
        !            96:        /* THIS STUFF IS INTERNET SPECIFIC */
        !            97:        host.h_addr_list = host_addrs;
        !            98:        *((u_long *)host.h_addr) = inet_addr(p);
        !            99:        host.h_length = sizeof (u_long);
        !           100:        host.h_addrtype = AF_INET;
        !           101:        while (*cp == ' ' || *cp == '\t')
        !           102:                cp++;
        !           103:        host.h_name = cp;
        !           104:        q = host.h_aliases = host_aliases;
        !           105:        cp = any(cp, " \t");
        !           106:        if (cp != NULL) 
        !           107:                *cp++ = '\0';
        !           108:        while (cp && *cp) {
        !           109:                if (*cp == ' ' || *cp == '\t') {
        !           110:                        cp++;
        !           111:                        continue;
        !           112:                }
        !           113:                if (q < &host_aliases[MAXALIASES - 1])
        !           114:                        *q++ = cp;
        !           115:                cp = any(cp, " \t");
        !           116:                if (cp != NULL)
        !           117:                        *cp++ = '\0';
        !           118:        }
        !           119:        *q = NULL;
        !           120:        return (&host);
        !           121: }
        !           122: 
        !           123: sethostfile(file)
        !           124:        char *file;
        !           125: {
        !           126:        _host_file = file;
        !           127: }
        !           128: 
        !           129: static char *
        !           130: any(cp, match)
        !           131:        register char *cp;
        !           132:        char *match;
        !           133: {
        !           134:        register char *mp, c;
        !           135: 
        !           136:        while (c = *cp) {
        !           137:                for (mp = match; *mp; mp++)
        !           138:                        if (*mp == c)
        !           139:                                return (cp);
        !           140:                cp++;
        !           141:        }
        !           142:        return ((char *)0);
        !           143: }

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