getprotoent.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:4k
- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- /*static char *sccsid = "from: @(#)getprotoent.c 5.8 (Berkeley) 2/24/91";*/
- static char *rcsid = "$Id$";
- #endif /* LIBC_SCCS and not lint */
- #include <pthread.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netdb.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include "proto_internal.h"
- static pthread_mutex_t proto_file_lock = PTHREAD_MUTEX_INITIALIZER;
- static int proto_file_stayopen;
- static FILE *proto_file;
- void setprotoent(int stayopen)
- {
- pthread_mutex_lock(&proto_file_lock);
- proto_file_stayopen |= stayopen;
- if (proto_file)
- rewind(proto_file);
- else
- proto_file = fopen(_PATH_PROTOCOLS, "r");
- pthread_mutex_unlock(&proto_file_lock);
- }
- void endprotoent()
- {
- pthread_mutex_lock(&proto_file_lock);
- if (proto_file)
- fclose(proto_file);
- pthread_mutex_unlock(&proto_file_lock);
- }
- struct protoent *getprotoent()
- {
- char *buf = _proto_buf();
- return getprotoent_r((struct protoent *) buf,
- buf + sizeof(struct protoent), PROTO_BUFSIZE);
- }
- struct protoent *getprotoent_r(struct protoent *result, char *buf, int bufsize)
- {
- char *p, *q, **alias;
- int l;
-
- errno = 0;
- pthread_mutex_lock(&proto_file_lock);
- if (proto_file == NULL && !(proto_file = fopen(_PATH_PROTOCOLS, "r"))) {
- pthread_mutex_unlock(&proto_file_lock);
- return NULL;
- }
- while (fgets(buf, bufsize, proto_file)) {
- if (*buf == '#')
- continue;
- p = strpbrk(buf, "#n");
- if (p == NULL)
- continue;
- *p = ' ';
- l = strlen(buf) + 1;
- result->p_name = buf;
- p = strpbrk(buf, " t");
- if (p == NULL)
- continue;
- *p++ = ' ';
- while (*p == ' ' || *p == 't')
- p++;
- q = strpbrk(p, " t");
- if (q != NULL)
- *q++ = ' ';
- if (SP(SP(buf, char, l), char *, 1) > buf + bufsize) {
- errno = ERANGE;
- break;
- }
- result->p_proto = atoi(p);
- result->p_aliases = (char **) ALIGN(buf + l, char *);
- alias = result->p_aliases;
- if (q != NULL) {
- p = q;
- while (p && *p) {
- if (*p == ' ' || *p == 't') {
- p++;
- continue;
- }
- if ((char *) &alias[2] > buf + bufsize) {
- errno = ERANGE;
- break;
- }
- *alias++ = p;
- p = strpbrk(p, " t");
- if (p != NULL)
- *p++ = ' ';
- }
- if (p && *p)
- break;
- }
- *alias = NULL;
- pthread_mutex_unlock(&proto_file_lock);
- return result;
- }
- pthread_mutex_unlock(&proto_file_lock);
- return NULL;
- }