rewrite comments into one, unified style

code/user/personalities/posix/posix_dir.c

@@ -1,4 +1,5 @@
-// posix_dir.c - chdir, getcwd, opendir, readdir, closedir
+// POSIX compatibility support for posix dir.
+
 #include <string.h>
 #include <ntlite/syscall.h>
 #include <stdlib.h>
@@ -10,6 +11,7 @@ typedef SYS_DIR_ENTRY KDIR_ENTRY;
 
 #define KATTR_DIR  0x10
 
+// Implements the chdir operation.
 __declspec(dllexport) int chdir(const char* path) {
     char native[512];
     PosixTranslatePath(path, native, sizeof(native));
@@ -19,6 +21,7 @@ __declspec(dllexport) int chdir(const char* path) {
     return 0;
 }
 
+// Implements the getcwd operation.
 __declspec(dllexport) char* getcwd(char* buf, size_t size) {
     if (!buf || size == 0) { errno = EINVAL; return (char*)0; }
     char native[512];
@@ -31,6 +34,7 @@ __declspec(dllexport) char* getcwd(char* buf, size_t size) {
     return buf;
 }
 
+// Implements the opendir operation.
 __declspec(dllexport) DIR* opendir(const char* path) {
     char native[512];
     PosixTranslatePath(path, native, sizeof(native));
@@ -47,6 +51,7 @@ __declspec(dllexport) DIR* opendir(const char* path) {
     return d;
 }
 
+// Implements the readdir operation.
 __declspec(dllexport) struct dirent* readdir(DIR* d) {
     if (!d) { errno = EBADF; return (struct dirent*)0; }
     KDIR_ENTRY ke;
@@ -62,6 +67,7 @@ __declspec(dllexport) struct dirent* readdir(DIR* d) {
     return &d->Current;
 }
 
+// Implements the closedir operation.
 __declspec(dllexport) int closedir(DIR* d) {
     if (!d) { errno = EBADF; return -1; }
     SysCloseHandle(d->KHandle);