[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/resolv/res_query.c b/ap/libc/glibc/glibc-2.23/resolv/res_query.c
new file mode 100644
index 0000000..95470a9
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/resolv/res_query.c
@@ -0,0 +1,652 @@
+/*
+ * Copyright (c) 1988, 1993
+ * The 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.
+ * 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.
+ */
+
+/*
+ * Portions Copyright (c) 1993 by Digital Equipment Corporation.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies, and that
+ * the name of Digital Equipment Corporation not be used in advertising or
+ * publicity pertaining to distribution of the document or software without
+ * specific, written prior permission.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
+ * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+/*
+ * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static const char sccsid[] = "@(#)res_query.c 8.1 (Berkeley) 6/4/93";
+static const char rcsid[] = "$BINDId: res_query.c,v 8.20 2000/02/29 05:39:12 vixie Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <ctype.h>
+#include <errno.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Options. Leave them on. */
+/* #undef DEBUG */
+
+#if PACKETSZ > 65536
+#define MAXPACKET PACKETSZ
+#else
+#define MAXPACKET 65536
+#endif
+
+#define QUERYSIZE (HFIXEDSZ + QFIXEDSZ + MAXCDNAME + 1)
+
+static int
+__libc_res_nquerydomain(res_state statp, const char *name, const char *domain,
+ int class, int type, u_char *answer, int anslen,
+ u_char **answerp, u_char **answerp2, int *nanswerp2,
+ int *resplen2, int *answerp2_malloced);
+
+/*
+ * Formulate a normal query, send, and await answer.
+ * Returned answer is placed in supplied buffer "answer".
+ * Perform preliminary check of answer, returning success only
+ * if no error is indicated and the answer count is nonzero.
+ * Return the size of the response on success, -1 on error.
+ * Error number is left in H_ERRNO.
+ *
+ * Caller must parse answer and determine whether it answers the question.
+ */
+int
+__libc_res_nquery(res_state statp,
+ const char *name, /* domain name */
+ int class, int type, /* class and type of query */
+ u_char *answer, /* buffer to put answer */
+ int anslen, /* size of answer buffer */
+ u_char **answerp, /* if buffer needs to be enlarged */
+ u_char **answerp2,
+ int *nanswerp2,
+ int *resplen2,
+ int *answerp2_malloced)
+{
+ HEADER *hp = (HEADER *) answer;
+ HEADER *hp2;
+ int n, use_malloc = 0;
+ u_int oflags = statp->_flags;
+
+ size_t bufsize = (type == T_UNSPEC ? 2 : 1) * QUERYSIZE;
+ u_char *buf = alloca (bufsize);
+ u_char *query1 = buf;
+ int nquery1 = -1;
+ u_char *query2 = NULL;
+ int nquery2 = 0;
+
+ again:
+ hp->rcode = NOERROR; /* default */
+
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf(";; res_query(%s, %d, %d)\n", name, class, type);
+#endif
+
+ if (type == T_UNSPEC)
+ {
+ n = res_nmkquery(statp, QUERY, name, class, T_A, NULL, 0, NULL,
+ query1, bufsize);
+ if (n > 0)
+ {
+ if ((oflags & RES_F_EDNS0ERR) == 0
+ && (statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0)
+ {
+ n = __res_nopt(statp, n, query1, bufsize, anslen / 2);
+ if (n < 0)
+ goto unspec_nomem;
+ }
+
+ nquery1 = n;
+ /* Align the buffer. */
+ int npad = ((nquery1 + __alignof__ (HEADER) - 1)
+ & ~(__alignof__ (HEADER) - 1)) - nquery1;
+ if (n > bufsize - npad)
+ {
+ n = -1;
+ goto unspec_nomem;
+ }
+ int nused = n + npad;
+ query2 = buf + nused;
+ n = res_nmkquery(statp, QUERY, name, class, T_AAAA, NULL, 0,
+ NULL, query2, bufsize - nused);
+ if (n > 0
+ && (oflags & RES_F_EDNS0ERR) == 0
+ && (statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0)
+ n = __res_nopt(statp, n, query2, bufsize - nused - n,
+ anslen / 2);
+ nquery2 = n;
+ }
+
+ unspec_nomem:;
+ }
+ else
+ {
+ n = res_nmkquery(statp, QUERY, name, class, type, NULL, 0, NULL,
+ query1, bufsize);
+
+ if (n > 0
+ && (oflags & RES_F_EDNS0ERR) == 0
+ && (statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0)
+ n = __res_nopt(statp, n, query1, bufsize, anslen);
+
+ nquery1 = n;
+ }
+
+ if (__builtin_expect (n <= 0, 0) && !use_malloc) {
+ /* Retry just in case res_nmkquery failed because of too
+ short buffer. Shouldn't happen. */
+ bufsize = (type == T_UNSPEC ? 2 : 1) * MAXPACKET;
+ buf = malloc (bufsize);
+ if (buf != NULL) {
+ query1 = buf;
+ use_malloc = 1;
+ goto again;
+ }
+ }
+ if (__glibc_unlikely (n <= 0)) {
+ /* If the query choked with EDNS0, retry without EDNS0. */
+ if ((statp->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0
+ && ((oflags ^ statp->_flags) & RES_F_EDNS0ERR) != 0) {
+ statp->_flags |= RES_F_EDNS0ERR;
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf(";; res_nquery: retry without EDNS0\n");
+#endif
+ goto again;
+ }
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf(";; res_query: mkquery failed\n");
+#endif
+ RES_SET_H_ERRNO(statp, NO_RECOVERY);
+ if (use_malloc)
+ free (buf);
+ return (n);
+ }
+ assert (answerp == NULL || (void *) *answerp == (void *) answer);
+ n = __libc_res_nsend(statp, query1, nquery1, query2, nquery2, answer,
+ anslen, answerp, answerp2, nanswerp2, resplen2,
+ answerp2_malloced);
+ if (use_malloc)
+ free (buf);
+ if (n < 0) {
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf(";; res_query: send error\n");
+#endif
+ RES_SET_H_ERRNO(statp, TRY_AGAIN);
+ return (n);
+ }
+
+ if (answerp != NULL)
+ /* __libc_res_nsend might have reallocated the buffer. */
+ hp = (HEADER *) *answerp;
+
+ /* We simplify the following tests by assigning HP to HP2 or
+ vice versa. It is easy to verify that this is the same as
+ ignoring all tests of HP or HP2. */
+ if (answerp2 == NULL || *resplen2 < (int) sizeof (HEADER))
+ {
+ hp2 = hp;
+ }
+ else
+ {
+ hp2 = (HEADER *) *answerp2;
+ if (n < (int) sizeof (HEADER))
+ {
+ hp = hp2;
+ }
+ }
+
+ /* Make sure both hp and hp2 are defined */
+ assert((hp != NULL) && (hp2 != NULL));
+
+ if ((hp->rcode != NOERROR || ntohs(hp->ancount) == 0)
+ && (hp2->rcode != NOERROR || ntohs(hp2->ancount) == 0)) {
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG) {
+ printf(";; rcode = %d, ancount=%d\n", hp->rcode,
+ ntohs(hp->ancount));
+ if (hp != hp2)
+ printf(";; rcode2 = %d, ancount2=%d\n", hp2->rcode,
+ ntohs(hp2->ancount));
+ }
+#endif
+ switch (hp->rcode == NOERROR ? hp2->rcode : hp->rcode) {
+ case NXDOMAIN:
+ if ((hp->rcode == NOERROR && ntohs (hp->ancount) != 0)
+ || (hp2->rcode == NOERROR
+ && ntohs (hp2->ancount) != 0))
+ goto success;
+ RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
+ break;
+ case SERVFAIL:
+ RES_SET_H_ERRNO(statp, TRY_AGAIN);
+ break;
+ case NOERROR:
+ if (ntohs (hp->ancount) != 0
+ || ntohs (hp2->ancount) != 0)
+ goto success;
+ RES_SET_H_ERRNO(statp, NO_DATA);
+ break;
+ case FORMERR:
+ case NOTIMP:
+ /* Servers must not reply to AAAA queries with
+ NOTIMP etc but some of them do. */
+ if ((hp->rcode == NOERROR && ntohs (hp->ancount) != 0)
+ || (hp2->rcode == NOERROR
+ && ntohs (hp2->ancount) != 0))
+ goto success;
+ /* FALLTHROUGH */
+ case REFUSED:
+ default:
+ RES_SET_H_ERRNO(statp, NO_RECOVERY);
+ break;
+ }
+ return (-1);
+ }
+ success:
+ return (n);
+}
+libresolv_hidden_def (__libc_res_nquery)
+
+int
+res_nquery(res_state statp,
+ const char *name, /* domain name */
+ int class, int type, /* class and type of query */
+ u_char *answer, /* buffer to put answer */
+ int anslen) /* size of answer buffer */
+{
+ return __libc_res_nquery(statp, name, class, type, answer, anslen,
+ NULL, NULL, NULL, NULL, NULL);
+}
+libresolv_hidden_def (res_nquery)
+
+/*
+ * Formulate a normal query, send, and retrieve answer in supplied buffer.
+ * Return the size of the response on success, -1 on error.
+ * If enabled, implement search rules until answer or unrecoverable failure
+ * is detected. Error code, if any, is left in H_ERRNO.
+ */
+int
+__libc_res_nsearch(res_state statp,
+ const char *name, /* domain name */
+ int class, int type, /* class and type of query */
+ u_char *answer, /* buffer to put answer */
+ int anslen, /* size of answer */
+ u_char **answerp,
+ u_char **answerp2,
+ int *nanswerp2,
+ int *resplen2,
+ int *answerp2_malloced)
+{
+ const char *cp, * const *domain;
+ HEADER *hp = (HEADER *) answer;
+ char tmp[NS_MAXDNAME];
+ u_int dots;
+ int trailing_dot, ret, saved_herrno;
+ int got_nodata = 0, got_servfail = 0, root_on_list = 0;
+ int tried_as_is = 0;
+ int searched = 0;
+
+ __set_errno (0);
+ RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); /* True if we never query. */
+
+ dots = 0;
+ for (cp = name; *cp != '\0'; cp++)
+ dots += (*cp == '.');
+ trailing_dot = 0;
+ if (cp > name && *--cp == '.')
+ trailing_dot++;
+
+ /* If there aren't any dots, it could be a user-level alias. */
+ if (!dots && (cp = res_hostalias(statp, name, tmp, sizeof tmp))!= NULL)
+ return (__libc_res_nquery(statp, cp, class, type, answer,
+ anslen, answerp, answerp2,
+ nanswerp2, resplen2, answerp2_malloced));
+
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf("dots=%d, statp->ndots=%d, trailing_dot=%d, name=%s\n",
+ (int)dots,(int)statp->ndots,(int)trailing_dot,name);
+#endif
+
+ /*
+ * If there are enough dots in the name, let's just give it a
+ * try 'as is'. The threshold can be set with the "ndots" option.
+ * Also, query 'as is', if there is a trailing dot in the name.
+ */
+ saved_herrno = -1;
+ if (dots >= statp->ndots || trailing_dot) {
+ ret = __libc_res_nquerydomain(statp, name, NULL, class, type,
+ answer, anslen, answerp,
+ answerp2, nanswerp2, resplen2,
+ answerp2_malloced);
+ if (ret > 0 || trailing_dot
+ /* If the second response is valid then we use that. */
+ || (ret == 0 && resplen2 != NULL && *resplen2 > 0))
+ return (ret);
+ saved_herrno = h_errno;
+ tried_as_is++;
+ if (answerp && *answerp != answer) {
+ answer = *answerp;
+ anslen = MAXPACKET;
+ }
+ if (answerp2 && *answerp2_malloced)
+ {
+ free (*answerp2);
+ *answerp2 = NULL;
+ *nanswerp2 = 0;
+ *answerp2_malloced = 0;
+ }
+ }
+
+ /*
+ * We do at least one level of search if
+ * - there is no dot and RES_DEFNAME is set, or
+ * - there is at least one dot, there is no trailing dot,
+ * and RES_DNSRCH is set.
+ */
+ if ((!dots && (statp->options & RES_DEFNAMES) != 0) ||
+ (dots && !trailing_dot && (statp->options & RES_DNSRCH) != 0)) {
+ int done = 0;
+
+ for (domain = (const char * const *)statp->dnsrch;
+ *domain && !done;
+ domain++) {
+ const char *dname = domain[0];
+ searched = 1;
+
+ /* __libc_res_nquerydoman concatenates name
+ with dname with a "." in between. If we
+ pass it in dname the "." we got from the
+ configured default search path, we'll end
+ up with "name..", which won't resolve.
+ OTOH, passing it "" will result in "name.",
+ which has the intended effect for both
+ possible representations of the root
+ domain. */
+ if (dname[0] == '.')
+ dname++;
+ if (dname[0] == '\0')
+ root_on_list++;
+
+ ret = __libc_res_nquerydomain(statp, name, dname,
+ class, type,
+ answer, anslen, answerp,
+ answerp2, nanswerp2,
+ resplen2, answerp2_malloced);
+ if (ret > 0 || (ret == 0 && resplen2 != NULL
+ && *resplen2 > 0))
+ return (ret);
+
+ if (answerp && *answerp != answer) {
+ answer = *answerp;
+ anslen = MAXPACKET;
+ }
+ if (answerp2 && *answerp2_malloced)
+ {
+ free (*answerp2);
+ *answerp2 = NULL;
+ *nanswerp2 = 0;
+ *answerp2_malloced = 0;
+ }
+
+ /*
+ * If no server present, give up.
+ * If name isn't found in this domain,
+ * keep trying higher domains in the search list
+ * (if that's enabled).
+ * On a NO_DATA error, keep trying, otherwise
+ * a wildcard entry of another type could keep us
+ * from finding this entry higher in the domain.
+ * If we get some other error (negative answer or
+ * server failure), then stop searching up,
+ * but try the input name below in case it's
+ * fully-qualified.
+ */
+ if (errno == ECONNREFUSED) {
+ RES_SET_H_ERRNO(statp, TRY_AGAIN);
+ return (-1);
+ }
+
+ switch (statp->res_h_errno) {
+ case NO_DATA:
+ got_nodata++;
+ /* FALLTHROUGH */
+ case HOST_NOT_FOUND:
+ /* keep trying */
+ break;
+ case TRY_AGAIN:
+ if (hp->rcode == SERVFAIL) {
+ /* try next search element, if any */
+ got_servfail++;
+ break;
+ }
+ /* FALLTHROUGH */
+ default:
+ /* anything else implies that we're done */
+ done++;
+ }
+
+ /* if we got here for some reason other than DNSRCH,
+ * we only wanted one iteration of the loop, so stop.
+ */
+ if ((statp->options & RES_DNSRCH) == 0)
+ done++;
+ }
+ }
+
+ /*
+ * If the query has not already been tried as is then try it
+ * unless RES_NOTLDQUERY is set and there were no dots.
+ */
+ if ((dots || !searched || (statp->options & RES_NOTLDQUERY) == 0)
+ && !(tried_as_is || root_on_list)) {
+ ret = __libc_res_nquerydomain(statp, name, NULL, class, type,
+ answer, anslen, answerp,
+ answerp2, nanswerp2, resplen2,
+ answerp2_malloced);
+ if (ret > 0 || (ret == 0 && resplen2 != NULL
+ && *resplen2 > 0))
+ return (ret);
+ }
+
+ /* if we got here, we didn't satisfy the search.
+ * if we did an initial full query, return that query's H_ERRNO
+ * (note that we wouldn't be here if that query had succeeded).
+ * else if we ever got a nodata, send that back as the reason.
+ * else send back meaningless H_ERRNO, that being the one from
+ * the last DNSRCH we did.
+ */
+ if (answerp2 && *answerp2_malloced)
+ {
+ free (*answerp2);
+ *answerp2 = NULL;
+ *nanswerp2 = 0;
+ *answerp2_malloced = 0;
+ }
+ if (saved_herrno != -1)
+ RES_SET_H_ERRNO(statp, saved_herrno);
+ else if (got_nodata)
+ RES_SET_H_ERRNO(statp, NO_DATA);
+ else if (got_servfail)
+ RES_SET_H_ERRNO(statp, TRY_AGAIN);
+ return (-1);
+}
+libresolv_hidden_def (__libc_res_nsearch)
+
+int
+res_nsearch(res_state statp,
+ const char *name, /* domain name */
+ int class, int type, /* class and type of query */
+ u_char *answer, /* buffer to put answer */
+ int anslen) /* size of answer */
+{
+ return __libc_res_nsearch(statp, name, class, type, answer,
+ anslen, NULL, NULL, NULL, NULL, NULL);
+}
+libresolv_hidden_def (res_nsearch)
+
+/*
+ * Perform a call on res_query on the concatenation of name and domain.
+ */
+static int
+__libc_res_nquerydomain(res_state statp,
+ const char *name,
+ const char *domain,
+ int class, int type, /* class and type of query */
+ u_char *answer, /* buffer to put answer */
+ int anslen, /* size of answer */
+ u_char **answerp,
+ u_char **answerp2,
+ int *nanswerp2,
+ int *resplen2,
+ int *answerp2_malloced)
+{
+ char nbuf[MAXDNAME];
+ const char *longname = nbuf;
+ size_t n, d;
+
+#ifdef DEBUG
+ if (statp->options & RES_DEBUG)
+ printf(";; res_nquerydomain(%s, %s, %d, %d)\n",
+ name, domain?domain:"<Nil>", class, type);
+#endif
+ if (domain == NULL) {
+ n = strlen(name);
+
+ /* Decrement N prior to checking it against MAXDNAME
+ so that we detect a wrap to SIZE_MAX and return
+ a reasonable error. */
+ n--;
+ if (n >= MAXDNAME - 1) {
+ RES_SET_H_ERRNO(statp, NO_RECOVERY);
+ return (-1);
+ }
+ longname = name;
+ } else {
+ n = strlen(name);
+ d = strlen(domain);
+ if (n + d + 1 >= MAXDNAME) {
+ RES_SET_H_ERRNO(statp, NO_RECOVERY);
+ return (-1);
+ }
+ sprintf(nbuf, "%s.%s", name, domain);
+ }
+ return (__libc_res_nquery(statp, longname, class, type, answer,
+ anslen, answerp, answerp2, nanswerp2,
+ resplen2, answerp2_malloced));
+}
+
+int
+res_nquerydomain(res_state statp,
+ const char *name,
+ const char *domain,
+ int class, int type, /* class and type of query */
+ u_char *answer, /* buffer to put answer */
+ int anslen) /* size of answer */
+{
+ return __libc_res_nquerydomain(statp, name, domain, class, type,
+ answer, anslen, NULL, NULL, NULL, NULL,
+ NULL);
+}
+libresolv_hidden_def (res_nquerydomain)
+
+const char *
+res_hostalias(const res_state statp, const char *name, char *dst, size_t siz) {
+ char *file, *cp1, *cp2;
+ char buf[BUFSIZ];
+ FILE *fp;
+
+ if (statp->options & RES_NOALIASES)
+ return (NULL);
+ file = getenv("HOSTALIASES");
+ if (file == NULL || (fp = fopen(file, "rce")) == NULL)
+ return (NULL);
+ setbuf(fp, NULL);
+ buf[sizeof(buf) - 1] = '\0';
+ while (fgets(buf, sizeof(buf), fp)) {
+ for (cp1 = buf; *cp1 && !isspace(*cp1); ++cp1)
+ ;
+ if (!*cp1)
+ break;
+ *cp1 = '\0';
+ if (ns_samename(buf, name) == 1) {
+ while (isspace(*++cp1))
+ ;
+ if (!*cp1)
+ break;
+ for (cp2 = cp1 + 1; *cp2 && !isspace(*cp2); ++cp2)
+ ;
+ *cp2 = '\0';
+ strncpy(dst, cp1, siz - 1);
+ dst[siz - 1] = '\0';
+ fclose(fp);
+ return (dst);
+ }
+ }
+ fclose(fp);
+ return (NULL);
+}
+libresolv_hidden_def (res_hostalias)