fygue: support directory lseek,write(error),close

CMakeLists.txt

@@ -264,9 +264,13 @@ set(SOURCES
   src/fs/fygue/fygue_open.c
   src/fs/fygue/fygue_syncfs.c
   src/fs/fygue/fygue_dir_read.c
+  src/fs/fygue/fygue_dir_lseek.c
+  src/fs/fygue/fygue_dir_write.c
+  src/fs/fygue/fygue_dir_close.c
   src/fs/fygue/fat/cluster.c
   src/fs/fygue/fat/initialize.c
-  src/fs/fygue/fat/readdir.c
+  src/fs/fygue/fat/fat_dir_read.c
+  src/fs/fygue/fat/fat_dir_close.c
   src/fs/fygue/fat/resolve.c
   src/fs/fygue/fat/sector.c
   src/fs/fygue/flash/cluster.c

src/fs/fygue/fat/fat.h

@@ -99,13 +99,19 @@ extern int fygue_fat_resolve(
     struct fygue_fat_resolve *resolve
 );
 
-/* fygue_fat_readdir(): readdir primitive */
-extern int fygue_fat_readdir(
+/* fygue_fat_dir_read(): readdir primitive */
+extern int fygue_fat_dir_read(
     struct fygue_fat *fat,
     struct fygue_fat_dir *dir,
     struct fygue_fat_dirent *dirent
 );
 
+/* fygue_fat_dir_close(): closedir primitive */
+extern int fygue_fat_dir_close(
+    struct fygue_fat *fat,
+    struct fygue_fat_dir *dir
+);
+
 //---
 // Cluster interface
 //---

src/fs/fygue/fat/fat_dir_close.c

@@ -0,0 +1,11 @@
+#include "fat.h"
+
+/* fygue_fat_dir_close(): closedir primitive */
+int fygue_fat_dir_close(struct fygue_fat *fat, struct fygue_fat_dir *dir)
+{
+    if (fat == NULL || dir == NULL)
+        return -1;
+    // nothing to do here...
+    return 0;
+}
+

src/fs/fygue/fat/fat_dir_read.c

@@ -371,14 +371,14 @@ static int _fygue_readdir_fat_check(struct _fat_info *finfo)
 // Public
 //---
 
-/* fygue_fat_readdir() - readdir-like primitive
+/* fygue_fat_dir_read() - readdir-like primitive
  *
  * return
  *   -3     no dirent remaning
  *   -2     internal error
  *   -1     argument error
  *    0     success */
-int fygue_fat_readdir(
+int fygue_fat_dir_read(
     struct fygue_fat *fat,
     struct fygue_fat_dir *dir,
     struct fygue_fat_dirent *current

src/fs/fygue/fat/resolve.c

@@ -76,7 +76,7 @@ static int _fygue_dirent_find(
 ) {
     while (true)
     {
-        if (fygue_fat_readdir(fat, dir, dirent) != 0)
+        if (fygue_fat_dir_read(fat, dir, dirent) != 0)
             return -1;
         if (strncmp(dirent->name, start, len) != 0)
             continue;

src/fs/fygue/fygue.c

@@ -92,7 +92,7 @@ const fs_descriptor_type_t fygue_descriptor_type = {
 
 const fs_descriptor_type_t fygue_dir_descriptor_type = {
     .read   = (void*)&fygue_dir_read,
-    .write  = NULL,
-    .lseek  = NULL,
+    .write  = (void*)&fygue_dir_write,
+    .lseek  = (void*)&fygue_dir_lseek,
     .close  = NULL,
 };

src/fs/fygue/fygue.h

@@ -68,7 +68,9 @@ struct fygue_resolve {
         } file;
         struct {
             struct fygue_fat_dir fat;
-            struct dirent *dirent;
+            struct dirent **dirent;
+            int count;
+            int pos;
         } dir;
     };
 };
@@ -99,6 +101,20 @@ extern int fygue_dir_read(
     size_t size
 );
 
+/* fygue_dir_lseek(): seek directory */
+extern off_t fygue_dir_lseek(
+    struct fygue_descriptor *desc,
+    off_t offset,
+    int whence
+);
+
+/* fygue_dir_write(): write directory (EISDIR) */
+ssize_t fygue_dir_write(
+    struct fygue_descriptor *desc,
+    void *buffer,
+    size_t size
+);
+
 #ifdef __cplusplus
 }
 #endif

src/fs/fygue/fygue_dir_close.c

@@ -0,0 +1,30 @@
+#include <stdlib.h>
+#include <string.h>
+#include "fygue.h"
+#include "fat/fat.h"
+
+int fygue_dir_close(struct fygue_descriptor *desc)
+{
+    struct fygue_fsinfo *fsinfo;
+
+    ENOTSUP_IF_NOT_FYGUE(-1);
+    if (desc == NULL || desc->resolve.type != FYGUE_FILE_TYPE_DIR) {
+        errno = EBADF;
+        return -1;
+    }
+    if (fygue_mount(&fsinfo, true) != 0) {
+        errno = EIO;
+        return -1;
+    }
+    fygue_fat_dir_close(&(fsinfo->fat), &desc->resolve.dir.fat);
+    if (desc->resolve.dir.dirent != NULL)
+    {
+        for (int i = 0 ; i < desc->resolve.dir.count ; i++) {
+            if (desc->resolve.dir.dirent[i] != NULL)
+                free(desc->resolve.dir.dirent[i]);
+        }
+        free(desc->resolve.dir.dirent);
+    }
+    memset(desc, 0x00, sizeof(struct fygue_descriptor));
+    return 0;
+}

src/fs/fygue/fygue_dir_lseek.c

@@ -0,0 +1,45 @@
+#include "fygue.h"
+
+//---
+// Internals
+//---
+
+/* _fygue_dir_discover(): force discover all directory */
+static void _fygue_dir_discover(struct fygue_descriptor *desc)
+{
+    struct dirent *ent = NULL;
+
+    while (true)
+    {
+        if (fygue_dir_read(desc, &ent, sizeof(ent)) != sizeof(ent))
+            break;
+    }
+}
+
+//---
+// Public
+//---
+
+/* fygue_dir_lseek(): seek directory */
+off_t fygue_dir_lseek(
+    struct fygue_descriptor *desc,
+    off_t offset,
+    int whence
+) {
+    if (desc == NULL || desc->resolve.type != FYGUE_FILE_TYPE_DIR) {
+        errno = EBADF;
+        return -1;
+    }
+    if(whence == SEEK_CUR)
+        offset += desc->resolve.dir.pos;
+    if(whence == SEEK_END) {
+        _fygue_dir_discover(desc);
+        offset += desc->resolve.dir.count;
+    }
+    if(offset < 0 || offset >= desc->resolve.dir.count + 1) {
+        errno = EINVAL;
+        return -1;
+    }
+    desc->resolve.dir.pos = offset;
+    return desc->resolve.dir.pos;
+}

src/fs/fygue/fygue_dir_read.c

@@ -2,6 +2,68 @@
 #include <string.h>
 #include "fygue.h"
 
+//---
+// Internals
+//---
+
+/* _fygue_dir_fat_read(): read and update internal cache
+ *
+ * return
+ *   -2     no directory found
+ *   -1     internal error
+ *    0     success */
+static int _fygue_dir_fat_read(
+    struct fygue_fsinfo *fsinfo,
+    struct fygue_descriptor *desc
+) {
+    struct fygue_fat_dirent fat_dirent;
+    struct dirent **dirent;
+    void *tmp;
+    size_t len;
+    int rc;
+
+    rc = fygue_fat_dir_read(
+        &(fsinfo->fat),
+        &desc->resolve.dir.fat,
+        &fat_dirent
+    );
+    if (rc <= -3)
+        return -2;
+    if (rc < 0) {
+        errno = EIO;
+        return -1;
+    }
+    tmp = reallocarray(
+        desc->resolve.dir.dirent,
+        desc->resolve.dir.count + 1,
+        sizeof(struct dirent *)
+    );
+    if (tmp == NULL) {
+        errno = ENOMEM;
+        return -1;
+    }
+    desc->resolve.dir.dirent = tmp;
+    desc->resolve.dir.count += 1;
+    //FIXME: ensure UTF-8/SHIFT-JS
+    len = strlen(fat_dirent.name);
+    dirent = &(desc->resolve.dir.dirent[desc->resolve.dir.pos]);
+    *dirent = calloc(1, sizeof(struct dirent) + len + 2);
+    if (*dirent == NULL) {
+        desc->resolve.dir.count -= 1;
+        errno = ENOMEM;
+        return -1;
+    }
+    //FIXME: ensure UTF-8/SHIFT-JS
+    (*dirent)->d_ino  = fat_dirent.cluster_id;
+    (*dirent)->d_type = DT_REG;
+    memcpy((*dirent)->d_name, fat_dirent.name, len + 1);
+    return 0;
+}
+
+//---
+// Public
+//---
+
 /* fygue_dir_read(): directory read implementation
  *
  * notes
@@ -11,9 +73,7 @@ int fygue_dir_read(
     struct dirent **dirent,
     size_t size
 ) {
-    struct fygue_fat_dirent fat_dirent;
     struct fygue_fsinfo *fsinfo;
-    size_t len;
     int rc;
 
     ENOTSUP_IF_NOT_FYGUE(-1);
@@ -34,35 +94,15 @@ int fygue_dir_read(
         errno = EIO;
         return -1;
     }
-
-    /* get the next FAT dirent */
-    rc = fygue_fat_readdir(
-        &(fsinfo->fat),
-        &desc->resolve.dir.fat,
-        &fat_dirent
-    );
-    if (rc <= -3)
-        return 0;
-    if (rc < 0) {
-        errno = EIO;
-        return -1;
+    if (desc->resolve.dir.pos >= desc->resolve.dir.count)
+    {
+        rc = _fygue_dir_fat_read(fsinfo, desc);
+        if (rc == -2)
+            return 0;
+        if (rc < 0)
+            return rc;
     }
-
-    /* since `struct dirent` use flexible array to store the filename
-     * we need to reallocate the buffer each time */
-    //FIXME: ensure UTF-8/SHIFT-JS
-    len = strlen(fat_dirent.name);
-    *dirent = desc->resolve.dir.dirent;
-    *dirent = realloc(*dirent, sizeof(struct dirent) + len + 2);
-    if (*dirent == NULL) {
-        errno = ENOMEM;
-        return -1;
-    }
-
-    /* convert FAT dirent into generic dirent information */
-    //FIXME: ensure UTF-8/SHIFT-JS
-    (*dirent)->d_ino  = fat_dirent.cluster_id;
-    (*dirent)->d_type = DT_REG;
-    memcpy((*dirent)->d_name, fat_dirent.name, len + 1);
-    return 0;
+    *dirent = desc->resolve.dir.dirent[desc->resolve.dir.pos];
+    desc->resolve.dir.pos += 1;
+    return sizeof *dirent;
 }

src/fs/fygue/fygue_dir_write.c

@@ -0,0 +1,22 @@
+#include "fygue.h"
+
+/* fygue_dir_write(): write directory (EISDIR) */
+ssize_t fygue_dir_write(
+    struct fygue_descriptor *desc,
+    void *buffer,
+    size_t size
+) {
+    ENOTSUP_IF_NOT_FYGUE(-1);
+    if (desc == NULL || desc->resolve.type != FYGUE_FILE_TYPE_DIR) {
+        errno = EBADF;
+        return -1;
+    }
+    if (buffer == NULL) {
+        errno = EFAULT;
+        return -1;
+    }
+    if (size == 0)
+        return 0;
+    errno = EISDIR;
+    return -1;
+}