gen.subproj/getprotoent.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #if defined(LIBC_SCCS) && !defined(lint)
  59 static char sccsid[] = "@(#)getprotoent.c       8.1 (Berkeley) 6/4/93";
  60 #endif /* LIBC_SCCS and not lint */
  61
  62 #include <sys/types.h>
  63 #include <sys/socket.h>
  64 #include <netdb.h>
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68
  69 #define MAXALIASES      35
  70
  71 static FILE *protof = NULL;
  72 static struct protoent proto;
  73 static char *proto_aliases[MAXALIASES];
  74 int _proto_stayopen;
  75
  76 void
  77 setprotoent(f)
  78         int f;
  79 {
  80         if (protof == NULL)
  81                 protof = fopen(_PATH_PROTOCOLS, "r" );
  82         else
  83                 rewind(protof);
  84         _proto_stayopen |= f;
  85 }
  86
  87 void
  88 endprotoent()
  89 {
  90         if (protof) {
  91                 fclose(protof);
  92                 protof = NULL;
  93         }
  94         _proto_stayopen = 0;
  95 }
  96
  97 struct protoent *
  98 getprotoent()
  99 {
 100         char *p;
 101         static char *line = NULL;
 102         register char *cp, **q;
 103
 104         if (protof == NULL && (protof = fopen(_PATH_PROTOCOLS, "r" )) == NULL)
 105                 return (NULL);
 106
 107         if (line == NULL) {
 108                 line = malloc(BUFSIZ+1);
 109                 if (line == NULL)
 110                         return (NULL);
 111         }
 112 again:
 113         if ((p = fgets(line, BUFSIZ, protof)) == NULL)
 114                 return (NULL);
 115         if (*p == '#')
 116                 goto again;
 117         cp = strpbrk(p, "#\n");
 118         if (cp == NULL)
 119                 goto again;
 120         *cp = '\0';
 121         proto.p_name = p;
 122         cp = strpbrk(p, " \t");
 123         if (cp == NULL)
 124                 goto again;
 125         *cp++ = '\0';
 126         while (*cp == ' ' || *cp == '\t')
 127                 cp++;
 128         p = strpbrk(cp, " \t");
 129         if (p != NULL)
 130                 *p++ = '\0';
 131         proto.p_proto = atoi(cp);
 132         q = proto.p_aliases = proto_aliases;
 133         if (p != NULL) {
 134                 cp = p;
 135                 while (cp && *cp) {
 136                         if (*cp == ' ' || *cp == '\t') {
 137                                 cp++;
 138                                 continue;
 139                         }
 140                         if (q < &proto_aliases[MAXALIASES - 1])
 141                                 *q++ = cp;
 142                         cp = strpbrk(cp, " \t");
 143                         if (cp != NULL)
 144                                 *cp++ = '\0';
 145                 }
 146         }
 147         *q = NULL;
 148         return (&proto);
 149 }