Add strverscmp() and versionsort[64]().

By Hai Zaar (haizaar AT codefidence.com)

include/dirent.h

@@ -293,6 +293,25 @@ extern int alphasort64 (__const void *__e1, __const void *__e2)
      __THROW __attribute_pure__ __nonnull ((1, 2));
 # endif
 
+/* Function to compare two `struct dirent's alphabetically.  */
+# ifndef __USE_FILE_OFFSET64
+extern int versionsort (__const void *__e1, __const void *__e2)
+     __THROW __attribute_pure__ __nonnull ((1, 2));
+# else
+#  ifdef __REDIRECT
+extern int __REDIRECT (versionsort,
+			   (__const void *__e1, __const void *__e2),
+			   versionsort64) __attribute_pure__ __nonnull ((1, 2));
+#  else
+#   define versionsort versionsort64
+#  endif
+# endif
+
+# if defined __USE_GNU && defined __USE_LARGEFILE64
+extern int versionsort64 (__const void *__e1, __const void *__e2)
+     __THROW __attribute_pure__ __nonnull ((1, 2));
+# endif
+
 #endif /* Use BSD or misc.  */
 
 __END_DECLS

include/string.h

@@ -422,11 +422,9 @@ libc_hidden_proto(strsep)
 
 #ifdef	__USE_GNU
 /* Compare S1 and S2 as strings holding name & indices/version numbers.  */
-# if 0
 extern int strverscmp (__const char *__s1, __const char *__s2)
      __THROW __attribute_pure__ __nonnull ((1, 2));
 libc_hidden_proto(strverscmp)
-# endif
 
 /* Return a string describing the meaning of the signal number in SIG.  */
 extern char *strsignal (int __sig) __THROW;

libc/misc/dirent/Makefile.in

@@ -6,10 +6,10 @@
 #
 
 CSRC :=	alphasort.c closedir.c dirfd.c opendir.c readdir.c rewinddir.c \
-	scandir.c seekdir.c telldir.c readdir_r.c
+	scandir.c seekdir.c telldir.c readdir_r.c versionsort.c
 
 ifeq ($(UCLIBC_HAS_LFS),y)
-CSRC +=	readdir64.c alphasort64.c scandir64.c readdir64_r.c
+CSRC +=	readdir64.c alphasort64.c scandir64.c readdir64_r.c versionsort64.c
 endif
 
 MISC_DIRENT_DIR := $(top_srcdir)libc/misc/dirent

libc/misc/dirent/versionsort.c

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2008-2009 Hai Zaar, Codefidence Ltd <haizaar@codefidence.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <dirent.h>
+#include <string.h>
+#include "dirstream.h"
+
+int versionsort(const void *a, const void *b)
+{
+	return strverscmp((*(const struct dirent **) a)->d_name,
+			(*(const struct dirent **) b)->d_name);
+}

libc/misc/dirent/versionsort64.c

@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2008-2009 Hai Zaar, Codefidence Ltd <haizaar@codefidence.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <_lfs_64.h>
+
+#include <dirent.h>
+#include <string.h>
+#include "dirstream.h"
+
+int versionsort64(const void *a, const void *b)
+{
+	return strverscmp((*(const struct dirent64 **) a)->d_name,
+			(*(const struct dirent64 **) b)->d_name);
+}