resolv: Remove _LIBC conditionals

ChangeLog

@@ -1,3 +1,12 @@
+2016-04-28  Florian Weimer  <fweimer@redhat.com>
+
+	* resolv/inet_addr.c: Remove _LIBC conditionals.
+	* resolv/res_data.c: Likewise.
+	* resolv/res_init.c: Likewise.
+	* resolv/res_mkquery.c: Likewise.
+	* resolv/res_libc.c: Update comment.
+	* resolv/README: Update.
+
 2016-04-28  Florian Weimer  <fweimer@redhat.com>
 
 	* resolv/gethnamaddr.c: Remove SCSS keyword.

resolv/README

@@ -149,8 +149,7 @@ src/lib/isc/
   base64.c
 
 Some of these files have been optimised a bit, and adaptations have
-been made to make them fit in with the rest of glibc.  The more
+been made to make them fit in with the rest of glibc.
-non-obvious changes are wrapped in something like `#ifdef _LIBC'.
 
 res_libc.c is home-brewn, although parts of it are taken from res_data.c.
 

resolv/inet_addr.c

@@ -72,13 +72,11 @@
 
 #include <ctype.h>
 
-#ifdef _LIBC
 # include <endian.h>
 # include <stdint.h>
 # include <stdlib.h>
 # include <limits.h>
 # include <errno.h>
-#endif
 
 /*
  * Ascii internet address interpretation routine.
@@ -106,9 +104,6 @@ __inet_aton(const char *cp, struct in_addr *addr)
 {
 	static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
 	in_addr_t val;
-#ifndef _LIBC
-	int base;
-#endif
 	char c;
 	union iaddr {
 	  uint8_t bytes[4];
@@ -117,10 +112,8 @@ __inet_aton(const char *cp, struct in_addr *addr)
 	uint8_t *pp = res.bytes;
 	int digit;
 
-#ifdef _LIBC
 	int saved_errno = errno;
 	__set_errno (0);
-#endif
 
 	res.word = 0;
 
@@ -133,7 +126,6 @@ __inet_aton(const char *cp, struct in_addr *addr)
 		 */
 		if (!isdigit(c))
 			goto ret_0;
-#ifdef _LIBC
 		{
 			char *endp;
 			unsigned long ul = strtoul (cp, (char **) &endp, 0);
@@ -146,33 +138,6 @@ __inet_aton(const char *cp, struct in_addr *addr)
 			cp = endp;
 		}
 		c = *cp;
-#else
-		val = 0; base = 10; digit = 0;
-		if (c == '0') {
-			c = *++cp;
-			if (c == 'x' || c == 'X')
-				base = 16, c = *++cp;
-			else {
-				base = 8;
-				digit = 1 ;
-			}
-		}
-		for (;;) {
-			if (isascii(c) && isdigit(c)) {
-				if (base == 8 && (c == '8' || c == '9'))
-					return (0);
-				val = (val * base) + (c - '0');
-				c = *++cp;
-				digit = 1;
-			} else if (base == 16 && isascii(c) && isxdigit(c)) {
-				val = (val << 4) |
-					(c + 10 - (islower(c) ? 'a' : 'A'));
-				c = *++cp;
-				digit = 1;
-			} else
-				break;
-		}
-#endif
 		if (c == '.') {
 			/*
 			 * Internet format:
@@ -206,15 +171,11 @@ __inet_aton(const char *cp, struct in_addr *addr)
 	if (addr != NULL)
 		addr->s_addr = res.word | htonl (val);
 
-#ifdef _LIBC
 	__set_errno (saved_errno);
-#endif
 	return (1);
 
 ret_0:
-#ifdef _LIBC
 	__set_errno (saved_errno);
-#endif
 	return (0);
 }
 weak_alias (__inet_aton, inet_aton)

resolv/res_data.c

@@ -65,67 +65,6 @@ const char *_res_sectioncodes[] attribute_hidden = {
 #endif
 
 #ifndef __BIND_NOSTATIC
-#ifdef _LIBC
-/* The definition has been moved to res_libc.c.  */
-#else
-#undef _res
-struct __res_state _res
-# if defined(__BIND_RES_TEXT)
-	= { RES_TIMEOUT, }	/* Motorola, et al. */
-# endif
-        ;
-#endif
-
-/* Proto. */
-#ifndef _LIBC
-int  res_ourserver_p(const res_state, const struct sockaddr_in *);
-void res_pquery(const res_state, const u_char *, int, FILE *);
-#endif
-
-#ifndef _LIBC
-/* Moved to res_libc.c since res_init() should go into libc.so but the
-   rest of this file not.  */
-int
-res_init(void) {
-	extern int __res_vinit(res_state, int);
-
-	/*
-	 * These three fields used to be statically initialized.  This made
-	 * it hard to use this code in a shared library.  It is necessary,
-	 * now that we're doing dynamic initialization here, that we preserve
-	 * the old semantics: if an application modifies one of these three
-	 * fields of _res before res_init() is called, res_init() will not
-	 * alter them.  Of course, if an application is setting them to
-	 * _zero_ before calling res_init(), hoping to override what used
-	 * to be the static default, we can't detect it and unexpected results
-	 * will follow.  Zero for any of these fields would make no sense,
-	 * so one can safely assume that the applications were already getting
-	 * unexpected results.
-	 *
-	 * _res.options is tricky since some apps were known to diddle the bits
-	 * before res_init() was first called. We can't replicate that semantic
-	 * with dynamic initialization (they may have turned bits off that are
-	 * set in RES_DEFAULT).  Our solution is to declare such applications
-	 * "broken".  They could fool us by setting RES_INIT but none do (yet).
-	 */
-	if (!_res.retrans)
-		_res.retrans = RES_TIMEOUT;
-	if (!_res.retry)
-		_res.retry = 4;
-	if (!(_res.options & RES_INIT))
-		_res.options = RES_DEFAULT;
-
-	/*
-	 * This one used to initialize implicitly to zero, so unless the app
-	 * has set it to something in particular, we can randomize it now.
-	 */
-	if (!_res.id)
-		_res.id = res_randomid();
-
-	return (__res_vinit(&_res, 1));
-}
-#endif
-
 void
 p_query(const u_char *msg) {
 	fp_query(msg, stdout);
@@ -215,23 +154,9 @@ res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
 	return (res_nsend(&_res, buf, buflen, ans, anssiz));
 }
 
-#ifndef _LIBC
-int
-res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
-	       u_char *ans, int anssiz)
-{
-	if (__res_maybe_init (&_res, 1) == -1) {
-		/* errno should have been set by res_init() in this case. */
-		return (-1);
-	}
-
-	return (res_nsendsigned(&_res, buf, buflen, key, ans, anssiz));
-}
-#endif
 
 void
 res_close(void) {
-#ifdef _LIBC
 	/*
 	 * Some stupid programs out there call res_close() before res_init().
 	 * Since _res._vcsock isn't explicitly initialized, these means that
@@ -241,7 +166,6 @@ res_close(void) {
 	 * early.  */
 	if ((_res.options & RES_INIT) == 0)
 	  return;
-#endif
 	/* We don't free the name server addresses because we never
 	   did it and it would be done implicitly on shutdown.  */
 	__res_iclose(&_res, false);

resolv/res_init.c

@@ -102,9 +102,7 @@ static u_int32_t net_mask (struct in_addr) __THROW;
 # define isascii(c) (!(c & 0200))
 #endif
 
-#ifdef _LIBC
 unsigned long long int __res_initstamp attribute_hidden;
-#endif
 
 /*
  * Resolver state default settings.
@@ -123,9 +121,7 @@ res_ninit(res_state statp) {
 
 	return (__res_vinit(statp, 0));
 }
-#ifdef _LIBC
 libc_hidden_def (__res_ninit)
-#endif
 
 /* This function has to be reachable by res_data.c but not publically. */
 int
@@ -145,9 +141,7 @@ __res_vinit(res_state statp, int preinit) {
 #ifndef RFC1535
 	int dots;
 #endif
-#ifdef _LIBC
 	statp->_u._ext.initstamp = __res_initstamp;
-#endif
 
 	if (!preinit) {
 		statp->retrans = RES_TIMEOUT;
@@ -283,7 +277,6 @@ __res_vinit(res_state statp, int preinit) {
 			statp->nsaddr_list[nserv].sin_port =
 				htons(NAMESERVER_PORT);
 			nserv++;
-#ifdef _LIBC
 		    } else {
 			struct in6_addr a6;
 			char *el;
@@ -332,7 +325,6 @@ __res_vinit(res_state statp, int preinit) {
 				nserv++;
 			    }
 			}
-#endif
 		    }
 		    continue;
 		}
@@ -385,12 +377,10 @@ __res_vinit(res_state statp, int preinit) {
 		}
 	    }
 	    statp->nscount = nserv;
-#ifdef _LIBC
 	    if (have_serv6) {
 		/* We try IPv6 servers again.  */
 		statp->ipv6_unavail = false;
 	    }
-#endif
 #ifdef RESOLVSORT
 	    statp->nsort = nsort;
 #endif
@@ -554,9 +544,7 @@ u_int
 res_randomid(void) {
 	return 0xffff & __getpid();
 }
-#ifdef _LIBC
 libc_hidden_def (__res_randomid)
-#endif
 
 
 /*
@@ -594,11 +582,8 @@ res_nclose(res_state statp)
 {
   __res_iclose (statp, true);
 }
-#ifdef _LIBC
 libc_hidden_def (__res_nclose)
-#endif
 
-#ifdef _LIBC
 # ifdef _LIBC_REENTRANT
 /* This is called when a thread is exiting to free resources held in _res.  */
 static void __attribute__ ((section ("__libc_thread_freeres_fn")))
@@ -616,4 +601,3 @@ res_thread_freeres (void)
 text_set_element (__libc_thread_subfreeres, res_thread_freeres);
 text_set_element (__libc_subfreeres, res_thread_freeres);
 # endif
-#endif

resolv/res_libc.c

@@ -15,6 +15,9 @@
  * SOFTWARE.
  */
 
+/* This file contains the definitions related to res_init which are
+   linked into libc instead of libresolv.  */
+
 #include <atomic.h>
 #include <limits.h>
 #include <sys/types.h>
@@ -23,11 +26,6 @@
 #include <resolv.h>
 #include <libc-lock.h>
 
-
-/* The following bit is copied from res_data.c (where it is #ifdef'ed
-   out) since res_init() should go into libc.so but the rest of that
-   file should not.  */
-
 extern unsigned long long int __res_initstamp attribute_hidden;
 /* We have atomic increment operations on 64-bit platforms.  */
 #if __WORDSIZE == 64

resolv/res_mkquery.c

@@ -77,13 +77,11 @@
 /* Options.  Leave them on. */
 /* #define DEBUG */
 
-#ifdef _LIBC
 # include <hp-timing.h>
 # include <stdint.h>
 # if HP_TIMING_AVAIL
 #  define RANDOM_BITS(Var) { uint64_t v64; HP_TIMING_NOW (v64); Var = v64; }
 # endif
-#endif
 
 /*
  * Form all types of queries.