cygwin: export strverscmp, add versionsort

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

winsup/cygwin/common.din

@@ -1396,6 +1396,7 @@ strtoull NOSIGFE
 strtoull_l NOSIGFE
 strtoumax = strtoull NOSIGFE
 strupr NOSIGFE
+strverscmp NOSIGFE
 strxfrm NOSIGFE
 strxfrm_l NOSIGFE
 swab NOSIGFE
@@ -1492,6 +1493,7 @@ vasprintf SIGFE
 vdprintf SIGFE
 verr SIGFE
 verrx SIGFE
+versionsort NOSIGFE
 vfiprintf SIGFE
 vfork SIGFE
 vfprintf SIGFE

winsup/cygwin/include/cygwin/version.h

@@ -476,12 +476,13 @@ details. */
   309: Export getloadavg.
   310: Export reallocarray.
   311: Export __xpg_sigpause.
+  312: Export strverscmp, versionsort.
 
   Note that we forgot to bump the api for ualarm, strtoll, strtoull,
   sigaltstack, sethostname. */
 
 #define CYGWIN_VERSION_API_MAJOR 0
-#define CYGWIN_VERSION_API_MINOR 311
+#define CYGWIN_VERSION_API_MINOR 312
 
 /* There is also a compatibity version number associated with the shared memory
    regions.  It is incremented when incompatible changes are made to the shared

winsup/cygwin/include/sys/dirent.h

@@ -89,6 +89,7 @@ int alphasort (const struct dirent **__a, const struct dirent **__b);
 int scandirat (int __dirfd, const char *__dir, struct dirent ***__namelist,
 	       int (*select) (const struct dirent *),
 	       int (*compar) (const struct dirent **, const struct dirent **));
+int versionsort (const struct dirent **__a, const struct dirent **__b);
 #endif
 
 #if __BSD_VISIBLE

winsup/cygwin/release/2.8.1

@@ -5,6 +5,8 @@ What's new:
 
 - New API: reallocarray
 
+- New API: strverscmp, versionsort.
+
 
 What changed:
 -------------

winsup/cygwin/scandir.cc

@@ -19,6 +19,12 @@ alphasort (const struct dirent **a, const struct dirent **b)
   return strcoll ((*a)->d_name, (*b)->d_name);
 }
 
+extern "C" int
+versionsort (const struct dirent **a, const struct dirent **b)
+{
+  return strverscmp ((*a)->d_name, (*b)->d_name);
+}
+
 extern "C" int
 scandir (const char *dir,
 	 struct dirent ***namelist,

winsup/doc/posix.xml

@@ -1367,6 +1367,7 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
     strtoll_l
     strtoul_l
     strtoull_l
+    strverscmp
     sysinfo
     tdestroy
     timegm
@@ -1377,6 +1378,7 @@ also IEEE Std 1003.1-2008 (POSIX.1-2008).</para>
     vasnprintf
     vasprintf
     vasprintf_r
+    versionsort
     wcsftime_l
     wcstod_l
     wcstof_l