Added opendir and readdir.

sources/main.c

@@ -1,10 +1,15 @@
+#include <dirent.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #define FUSE_USE_VERSION 31
 
 #include "sourcefs.h"
 #include <fuse3/fuse.h>
 
-const char *mountpoint;
+const char *mountpoint = NULL;
 
 /*
  * #In this function we need to:
@@ -16,40 +21,65 @@ static void *icfs_init(struct fuse_conn_info *conn, struct fuse_config *cfg) {
   (void)conn; /* Explicit way to tell we ignore these arguments. */
   (void)cfg;  /* This also silences the compiler warnings. */
 
-  source_init(mountpoint);
+  int ret = source_init(mountpoint);
+  if (ret != 0) {
+    perror("Failed to initialize filesystem.");
+    exit(EXIT_FAILURE);
+  }
+
   return NULL;
 }
 
 static int icfs_getattr(const char *path, struct stat *stbuf,
                         struct fuse_file_info *fi) {
+  (void)stbuf;
+  (void)fi;
 
   int statret = source_stat(path, stbuf);
-
-  //(void)fi;
-
-  /*
-  int res = 0;
-
-  memset(stbuf, 0, sizeof(struct stat));
-  if (strcmp(path, "/") == 0) {
-    stbuf->st_mode = S_IFDIR | 0755;
-    stbuf->st_nlink = 2;
-  } else if (strcmp(path + 1, options.filename) == 0) {
-    stbuf->st_mode = S_IFREG | 0444;
-    stbuf->st_nlink = 1;
-    stbuf->st_size = strlen(options.contents);
-  } else
-    res = -ENOENT;
-
-  */
-  // return res;
+  if (statret != 0)
+    perror("Stat failed.");
 
   return statret;
 }
 
+static int icfs_opendir(const char *path, struct fuse_file_info *fi) {
+  DIR *dir_stream = source_opendir(path);
+
+  if (dir_stream == NULL) {
+    perror("Opendir failed.");
+    return 1;
+  }
+
+  fi->fh = (intptr_t)dir_stream;
+
+  return 0;
+}
+
+static int icfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
+                        off_t offset, struct fuse_file_info *fi,
+                        enum fuse_readdir_flags flags) {
+  DIR *dir_stream = (DIR *)fi->fh;
+  struct dirent *dir_entry = source_readdir(dir_stream);
+  if (dir_entry == NULL) {
+    perror("Readdir failed.");
+    return 1;
+  }
+
+  do {
+    int filler_ret = filler(buf, dir_entry->d_name, NULL, 0, 0);
+    if (filler_ret != 0) {
+      return -ENOMEM;
+    }
+  } while ((dir_entry = source_readdir(dir_stream)) != NULL);
+
+  return 0;
+}
+
 static const struct fuse_operations icfs_oper = {
     .init = icfs_init,
     .getattr = icfs_getattr,
+    .opendir = icfs_opendir,
+    .readdir = icfs_readdir,
 };
 
 int main(int argc, char *argv[]) {
@@ -58,7 +88,7 @@ int main(int argc, char *argv[]) {
 
   // FUSE won't tell us the mountpoint on it's own, so we need to extract it
   // ourselves.
-  mountpoint = realpath(argv[argc - 2], NULL);
+  mountpoint = realpath(argv[argc - 1], NULL);
 
   ret = fuse_main(argc, argv, &icfs_oper, NULL);
 

sources/sourcefs.c

@@ -1,6 +1,7 @@
 #define _GNU_SOURCE
 
 #include "sourcefs.h"
+#include <dirent.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <sys/stat.h>
@@ -9,6 +10,8 @@ static struct source_files_handle {
   int root_fd;
 } handle;
 
+void source_fname_translate(const char *filename) {}
+
 int source_init(const char *root_path) {
   int root_fd = open(root_path, O_PATH);
 
@@ -26,3 +29,12 @@ int source_stat(const char *restrict pathname, struct stat *restrict statbuf) {
   int statret = fstatat(handle.root_fd, pathname, statbuf, 0);
   return statret;
 }
+
+DIR *source_opendir(const char *filename) {
+  int fd = openat(handle.root_fd, filename, NULL);
+  DIR *dir_pointer = fdopendir(fd);
+  return dir_pointer;
+}
+
+// Just regular readdir in disguise.
+struct dirent *source_readdir(DIR *dirp) { return readdir(dirp); }

sources/sourcefs.h

@@ -3,13 +3,14 @@
 #ifndef SOURCEFS_H
 #define SOURCEFS_H
 
+#include <dirent.h>
 #include <sys/stat.h>
 
 /**
  * Initializes the source file handling.
  *
  * @param root_path The root of the source files folder.
- * @return 0 on success, 1 on failure.
+ * @return 0 on success, -1 on failure.
  */
 int source_init(const char *root_path);
 
@@ -20,4 +21,18 @@ int source_init(const char *root_path);
  */
 int source_stat(const char *restrict pathname, struct stat *restrict statbuf);
 
+/**
+ * `readdir()`, but for source files.
+ *
+ * @see `readdir(3)`
+ */
+struct dirent *source_readdir(DIR *dirp);
+
+/**
+ * `opendir()`, but for source files.
+ *
+ * @see `opendir()`
+ */
+DIR *source_opendir(const char *filename);
+
 #endif // !SOURCEFS_H