Modernize scandir(3) and alphasort(3) interfaces according to the IEEE

Std 1003.1-2008. Both Linux and Solaris conforms to the new definitions,
so we better follow too (older glibc used old BSDish alphasort prototype
and corresponding type of the comparision function for scandir). While
there, change the definitions of the functions to ANSI C and fix several
style issues nearby.

Remove requirement for "sys/types.h" include for functions from manpage.

POSIX also requires that alphasort(3) sorts as if strcoll(3) was used,
but leave the strcmp(3) call in the function for now.

Adapt in-tree callers of scandir(3) to new declaration. The fact that
select_sections() from catman(1) could modify supplied struct dirent is
a bug.

PR:	standards/142255
MFC after:	2 weeks

1 files changed, 3 insertions, 2 deletions

diff --git a/include/dirent.h b/include/dirent.h
index 63626b5..8d7e5c1 100644
--- a/include/dirent.h
+++ b/include/dirent.h
@@ -95,7 +95,7 @@ typedef	void *	DIR;
 __BEGIN_DECLS
 #if __BSD_VISIBLE
 DIR	*__opendir2(const char *, int);
-int	 alphasort(const void *, const void *);
+int	 alphasort(const struct dirent **, const struct dirent **);
 int	 getdents(int, char *, int);
 int	 getdirentries(int, char *, int, long *);
 #endif
@@ -109,7 +109,8 @@ int	 readdir_r(DIR *, struct dirent *, struct dirent **);
 void	 rewinddir(DIR *);
 #if __BSD_VISIBLE
 int	 scandir(const char *, struct dirent ***,
-	    int (*)(struct dirent *), int (*)(const void *, const void *));
+	    int (*)(const struct dirent *), int (*)(const struct dirent **,
+	    const struct dirent **));
 #endif
 #if __XSI_VISIBLE
 void	 seekdir(DIR *, long);