From 865018e7f837c275cf0c67364c5e3fb108eeae28 Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Sun, 23 Oct 2022 14:59:06 +0200
Subject: [PATCH] libc: Implement dirfd, rewinddir, telldir and seekdir

---
 libs/libc/include/dirent.h | 12 ++++++++++++
 libs/libc/src/dirent.cpp   | 26 +++++++++++++++++++++++---
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/libs/libc/include/dirent.h b/libs/libc/include/dirent.h
index c4192d5e..c8c2ed67 100644
--- a/libs/libc/include/dirent.h
+++ b/libs/libc/include/dirent.h
@@ -36,6 +36,18 @@ extern "C"
      * calls to readdir(). */
     struct dirent* readdir(DIR* stream);
 
+    /* Returns the file descriptor associated with stream. */
+    int dirfd(DIR* stream);
+
+    /* Positions stream's offset at the start of the directory. */
+    void rewinddir(DIR* stream);
+
+    /* Returns the current offset position for stream. */
+    long telldir(DIR* stream);
+
+    /* Moves stream's read offset to offset, which should be the return value of a previous call to telldir(). */
+    void seekdir(DIR* stream, long offset);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/libs/libc/src/dirent.cpp b/libs/libc/src/dirent.cpp
index 5447647c..221f7cca 100644
--- a/libs/libc/src/dirent.cpp
+++ b/libs/libc/src/dirent.cpp
@@ -10,9 +10,9 @@ extern "C"
 {
     DIR* opendir(const char* path)
     {
-        int dirfd = open(path, O_RDONLY | O_DIRECTORY);
-        if (dirfd < 0) return NULL;
-        return fdopendir(dirfd);
+        int fd = open(path, O_RDONLY | O_DIRECTORY);
+        if (fd < 0) return NULL;
+        return fdopendir(fd);
     }
 
     DIR* fdopendir(int fd)
@@ -50,4 +50,24 @@ extern "C"
         strlcpy(result.d_name, ent.name, NAME_MAX);
         return &result;
     }
+
+    int dirfd(DIR* stream)
+    {
+        return stream->d_dirfd;
+    }
+
+    void rewinddir(DIR* stream)
+    {
+        lseek(stream->d_dirfd, 0, SEEK_SET);
+    }
+
+    long telldir(DIR* stream)
+    {
+        return lseek(stream->d_dirfd, 0, SEEK_CUR);
+    }
+
+    void seekdir(DIR* stream, long offset)
+    {
+        lseek(stream->d_dirfd, offset, SEEK_SET);
+    }
 }
\ No newline at end of file