LibC: Add function fdopendir

This adds the function fdopendir and refactors opendir so that opendir
just opens a file descriptor and passes the file descriptor onto
fdopendir.

2 files changed, 8 insertions, 0 deletions

diff --git a/Userland/Libraries/LibC/dirent.cpp b/Userland/Libraries/LibC/dirent.cpp
index 7475d22519..3447b9d370 100644
--- a/Userland/Libraries/LibC/dirent.cpp
+++ b/Userland/Libraries/LibC/dirent.cpp
@@ -26,6 +26,13 @@ DIR* opendir(const char* name)
     int fd = open(name, O_RDONLY | O_DIRECTORY);
     if (fd == -1)
         return nullptr;
+    return fdopendir(fd);
+}
+
+DIR* fdopendir(int fd)
+{
+    if (fd == -1)
+        return nullptr;
     DIR* dirp = (DIR*)malloc(sizeof(DIR));
     dirp->fd = fd;
     dirp->buffer = nullptr;
diff --git a/Userland/Libraries/LibC/dirent.h b/Userland/Libraries/LibC/dirent.h
index e78114bb6d..1e3f8534cc 100644
--- a/Userland/Libraries/LibC/dirent.h
+++ b/Userland/Libraries/LibC/dirent.h
@@ -27,6 +27,7 @@ struct __DIR {
 };
 typedef struct __DIR DIR;
 
+DIR* fdopendir(int fd);
 DIR* opendir(const char* name);
 int closedir(DIR*);
 void rewinddir(DIR*);