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Annotation of 43BSDTahoe/lib/libc/net/getnetent.c, revision 1.1.1.1

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[] = "@(#)getnetent.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: 
                     28: #define        MAXALIASES      35
                     29: 
                     30: static char NETDB[] = "/etc/networks";
                     31: static FILE *netf = NULL;
                     32: static char line[BUFSIZ+1];
                     33: static struct netent net;
                     34: static char *net_aliases[MAXALIASES];
                     35: int _net_stayopen;
                     36: static char *any();
                     37: 
                     38: setnetent(f)
                     39:        int f;
                     40: {
                     41:        if (netf == NULL)
                     42:                netf = fopen(NETDB, "r" );
                     43:        else
                     44:                rewind(netf);
                     45:        _net_stayopen |= f;
                     46: }
                     47: 
                     48: endnetent()
                     49: {
                     50:        if (netf) {
                     51:                fclose(netf);
                     52:                netf = NULL;
                     53:        }
                     54:        _net_stayopen = 0;
                     55: }
                     56: 
                     57: struct netent *
                     58: getnetent()
                     59: {
                     60:        char *p;
                     61:        register char *cp, **q;
                     62: 
                     63:        if (netf == NULL && (netf = fopen(NETDB, "r" )) == NULL)
                     64:                return (NULL);
                     65: again:
                     66:        p = fgets(line, BUFSIZ, netf);
                     67:        if (p == NULL)
                     68:                return (NULL);
                     69:        if (*p == '#')
                     70:                goto again;
                     71:        cp = any(p, "#\n");
                     72:        if (cp == NULL)
                     73:                goto again;
                     74:        *cp = '\0';
                     75:        net.n_name = p;
                     76:        cp = any(p, " \t");
                     77:        if (cp == NULL)
                     78:                goto again;
                     79:        *cp++ = '\0';
                     80:        while (*cp == ' ' || *cp == '\t')
                     81:                cp++;
                     82:        p = any(cp, " \t");
                     83:        if (p != NULL)
                     84:                *p++ = '\0';
                     85:        net.n_net = inet_network(cp);
                     86:        net.n_addrtype = AF_INET;
                     87:        q = net.n_aliases = net_aliases;
                     88:        if (p != NULL) 
                     89:                cp = p;
                     90:        while (cp && *cp) {
                     91:                if (*cp == ' ' || *cp == '\t') {
                     92:                        cp++;
                     93:                        continue;
                     94:                }
                     95:                if (q < &net_aliases[MAXALIASES - 1])
                     96:                        *q++ = cp;
                     97:                cp = any(cp, " \t");
                     98:                if (cp != NULL)
                     99:                        *cp++ = '\0';
                    100:        }
                    101:        *q = NULL;
                    102:        return (&net);
                    103: }
                    104: 
                    105: static char *
                    106: any(cp, match)
                    107:        register char *cp;
                    108:        char *match;
                    109: {
                    110:        register char *mp, c;
                    111: 
                    112:        while (c = *cp) {
                    113:                for (mp = match; *mp; mp++)
                    114:                        if (*mp == c)
                    115:                                return (cp);
                    116:                cp++;
                    117:        }
                    118:        return ((char *)0);
                    119: }

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