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Annotation of 43BSD/lib/libc/net/hosttable/gethostent.c, revision 1.1.1.1

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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