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Annotation of 43BSDTahoe/lib/libc/net/getprotoent.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[] = "@(#)getprotoent.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 PROTODB[] = "/etc/protocols";
                     31: static FILE *protof = NULL;
                     32: static char line[BUFSIZ+1];
                     33: static struct protoent proto;
                     34: static char *proto_aliases[MAXALIASES];
                     35: static char *any();
                     36: int _proto_stayopen;
                     37: 
                     38: setprotoent(f)
                     39:        int f;
                     40: {
                     41:        if (protof == NULL)
                     42:                protof = fopen(PROTODB, "r" );
                     43:        else
                     44:                rewind(protof);
                     45:        _proto_stayopen |= f;
                     46: }
                     47: 
                     48: endprotoent()
                     49: {
                     50:        if (protof) {
                     51:                fclose(protof);
                     52:                protof = NULL;
                     53:        }
                     54:        _proto_stayopen = 0;
                     55: }
                     56: 
                     57: struct protoent *
                     58: getprotoent()
                     59: {
                     60:        char *p;
                     61:        register char *cp, **q;
                     62: 
                     63:        if (protof == NULL && (protof = fopen(PROTODB, "r" )) == NULL)
                     64:                return (NULL);
                     65: again:
                     66:        if ((p = fgets(line, BUFSIZ, protof)) == NULL)
                     67:                return (NULL);
                     68:        if (*p == '#')
                     69:                goto again;
                     70:        cp = any(p, "#\n");
                     71:        if (cp == NULL)
                     72:                goto again;
                     73:        *cp = '\0';
                     74:        proto.p_name = p;
                     75:        cp = any(p, " \t");
                     76:        if (cp == NULL)
                     77:                goto again;
                     78:        *cp++ = '\0';
                     79:        while (*cp == ' ' || *cp == '\t')
                     80:                cp++;
                     81:        p = any(cp, " \t");
                     82:        if (p != NULL)
                     83:                *p++ = '\0';
                     84:        proto.p_proto = atoi(cp);
                     85:        q = proto.p_aliases = proto_aliases;
                     86:        if (p != NULL) {
                     87:                cp = p;
                     88:                while (cp && *cp) {
                     89:                        if (*cp == ' ' || *cp == '\t') {
                     90:                                cp++;
                     91:                                continue;
                     92:                        }
                     93:                        if (q < &proto_aliases[MAXALIASES - 1])
                     94:                                *q++ = cp;
                     95:                        cp = any(cp, " \t");
                     96:                        if (cp != NULL)
                     97:                                *cp++ = '\0';
                     98:                }
                     99:        }
                    100:        *q = NULL;
                    101:        return (&proto);
                    102: }
                    103: 
                    104: static char *
                    105: any(cp, match)
                    106:        register char *cp;
                    107:        char *match;
                    108: {
                    109:        register char *mp, c;
                    110: 
                    111:        while (c = *cp) {
                    112:                for (mp = match; *mp; mp++)
                    113:                        if (*mp == c)
                    114:                                return (cp);
                    115:                cp++;
                    116:        }
                    117:        return ((char *)0);
                    118: }

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