libroot: Replace swab() with the musl version.

This was the last function remaining in the glibc "string" directory,
so now we can remove that directory and a bunch of related files
that are no longer needed.

src/system/libroot/Jamfile

@@ -47,7 +47,6 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			posix_gnu_regex.o
 			posix_gnu_stdio.o
 			posix_gnu_stdlib.o
-			posix_gnu_string.o
 			posix_gnu_wcsmbs.o
 			posix_stdlib.o
 			posix_string.o

src/system/libroot/posix/glibc/Jamfile

@@ -15,5 +15,4 @@ SubInclude HAIKU_TOP src system libroot posix glibc misc ;
 SubInclude HAIKU_TOP src system libroot posix glibc regex ;
 SubInclude HAIKU_TOP src system libroot posix glibc stdio-common ;
 SubInclude HAIKU_TOP src system libroot posix glibc stdlib ;
-SubInclude HAIKU_TOP src system libroot posix glibc string ;
 SubInclude HAIKU_TOP src system libroot posix glibc wcsmbs ;

src/system/libroot/posix/glibc/string/Jamfile

@@ -1,18 +0,0 @@
-SubDir HAIKU_TOP src system libroot posix glibc string ;
-
-local architectureObject ;
-for architectureObject in [ MultiArchSubDirSetup ] {
-	on $(architectureObject) {
-		local architecture = $(TARGET_PACKAGING_ARCH) ;
-
-		SubDirSysHdrs $(HAIKU_TOP) src system libroot posix glibc include arch
-			$(TARGET_ARCH) ;
-		SubDirSysHdrs $(HAIKU_TOP) src system libroot posix glibc include arch
-			generic ;
-		SubDirSysHdrs $(HAIKU_TOP) src system libroot posix glibc include ;
-
-		MergeObject <$(architecture)>posix_gnu_string.o :
-			swab.c
-			;
-	}
-}

src/system/libroot/posix/glibc/string/swab.c

@@ -1,34 +0,0 @@
-/* Copyright (C) 1992, 1996, 1997 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include <unistd.h>
-
-void
-swab (const void *bfrom, void *bto, ssize_t n)
-{
-  const char *from = (const char *) bfrom;
-  char *to = (char *) bto;
-
-  n &= ~((ssize_t) 1);
-  while (n > 1)
-    {
-      const char b0 = from[--n], b1 = from[--n];
-      to[n] = b0;
-      to[n + 1] = b1;
-    }
-}

src/system/libroot/posix/musl/string/Jamfile

@@ -10,6 +10,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 
 		MergeObject <$(architecture)>posix_musl_string.o :
 			memrchr.c
+			swab.c
 			;
 	}
 }

src/system/libroot/posix/musl/string/swab.c

@@ -0,0 +1,17 @@
+#include <unistd.h>
+
+#if __GNUC__ < 4
+#define restrict
+#endif
+
+void swab(const void *restrict _src, void *restrict _dest, ssize_t n)
+{
+	const char *src = _src;
+	char *dest = _dest;
+	for (; n>1; n-=2) {
+		dest[0] = src[1];
+		dest[1] = src[0];
+		dest += 2;
+		src += 2;
+	}
+}