POSIX: add ffsl and ffsll from musl sources.

appeared in issue 8:
https://pubs.opengroup.org/onlinepubs/9799919799/functions/ffs.html
Change-Id: Ic382498c3e2d6138aedbeb88578882457ee875ee
Reviewed-on: https://review.haiku-os.org/c/haiku/+/9836
Reviewed-by: waddlesplash <[email protected]>

headers/posix/strings.h

@@ -14,7 +14,9 @@
 extern "C" {
 #endif
 
-static __inline__ int ffs(int i) { return __builtin_ffs(i); }
+extern int		ffs(int i);
+extern int		ffsl(long i);
+extern int		ffsll(long long i);
 
 extern int		strcasecmp(const char *string1, const char *string2);
 extern int		strncasecmp(const char *string1, const char *string2,

src/libs/compat/freebsd_network/compat/sys/libkern.h

@@ -28,18 +28,6 @@ static __inline int imin(int a, int b) { return (a < b ? a : b); }
 extern int abs(int a);
 
 
-static __inline __pure2 int
-ffsl(long mask)
-{
-	return (__builtin_ffsl((u_long)mask));
-}
-
-static __inline __pure2 int
-ffsll(long long mask)
-{
-	return (__builtin_ffsll((unsigned long long)mask));
-}
-
 static __inline __pure2 int
 fls(int mask)
 {

src/system/kernel/lib/Jamfile

@@ -50,6 +50,8 @@ SEARCH_SOURCE += [ FDirName $(posixSources) musl string ] ;
 
 local muslSources =
 	ffs.c
+	ffsl.c
+	ffsll.c
 	rand.c
 	rand_r.c
 	;

src/system/libroot/posix/musl/misc/Jamfile

@@ -14,6 +14,8 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			basename.c
 			dirname.c
 			ffs.c
+			ffsl.c
+			ffsll.c
 			ftw.c
 			getsubopt.c
 			nftw.c

src/system/libroot/posix/musl/misc/ffs.c

@@ -1,6 +1,6 @@
+#include <strings.h>
 #include "atomic.h"
 
-int ffs(int i);
 int ffs(int i)
 {
 	return i ? a_ctz_l(i)+1 : 0;

src/system/libroot/posix/musl/misc/ffsl.c

@@ -0,0 +1,7 @@
+#include <strings.h>
+#include "atomic.h"
+
+int ffsl(long i)
+{
+	return i ? a_ctz_l(i)+1 : 0;
+}

src/system/libroot/posix/musl/misc/ffsll.c

@@ -0,0 +1,7 @@
+#include <strings.h>
+#include "atomic.h"
+
+int ffsll(long long i)
+{
+	return i ? a_ctz_64(i)+1 : 0;
+}