fs: stat(), proper unlink(), rmdir()

CMakeLists.txt

@@ -52,6 +52,7 @@ set(SOURCES_COMMON
   src/fs/rewinddir.c
   src/fs/rmdir.c
   src/fs/seekdir.c
+  src/fs/stat.c
   src/fs/telldir.c
   src/fs/unlink.c
   src/fs/write.c
@@ -61,6 +62,8 @@ set(SOURCES_COMMON
   src/fs/fugue/fugue_dir.c
   src/fs/fugue/fugue_open.c
   src/fs/fugue/fugue_mkdir.c
+  src/fs/fugue/fugue_stat.c
+  src/fs/fugue/fugue_rmdir.c
   src/fs/fugue/fugue_unlink.c
   src/fs/fugue/util.c
   # Interrupt Controller driver

TODO

@@ -2,7 +2,8 @@ Extensions on existing code:
 * usb:       add PC->calc reading, and interrupt pipes
 * fs:        support RAM files
 * fs:        support USB streams as generic file descriptors
-* fugue:     support glob() and stat() to abstract away BFile entirely
+* fugue:     support glob() to abstract away BFile entirely
+* fugue/fs:  offer a primitive to remove recursively, which is native in Fugue
 * bfile:     implement the optimization-restart as realized by Kbd2
 * kernel:    better restore to userspace before panic (ensure BL=0 IMASK=0)
 * project:   add license file

src/fs/fugue/fugue.h

@@ -5,6 +5,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <dirent.h>
+#include <sys/stat.h>
 
 /* File descriptor type */
 extern const fs_descriptor_type_t fugue_descriptor_type;
@@ -21,6 +22,8 @@ int fugue_mkdir(char const *path, mode_t mode);
 
 int fugue_rmdir(char const *path);
 
+int fugue_stat(char const * restrict path, struct stat * restrict statbuf);
+
 /* Other functions */
 
 void *fugue_dir_explore(char const *path);

src/fs/fugue/fugue_dir.c

@@ -145,20 +145,8 @@ void *fugue_dir_explore(char const *path)
 		if(!ent) goto alloc_failure;
 
 		ent->d_ino = 0;
-		ent->d_type = DT_UNKNOWN;
+		ent->d_type = bfile_type_to_dirent(info.type);
 		fc_to_utf8(ent->d_name, fc_path, name_length + 1);
-
-		if(info.type == BFile_Type_File)
-			ent->d_type = DT_REG;
-		if(info.type == BFile_Type_Archived)
-			ent->d_type = DT_REG;
-		if(info.type == BFile_Type_Directory)
-			ent->d_type = DT_DIR;
-		if(info.type == BFile_Type_Dot)
-			ent->d_type = DT_DIR;
-		if(info.type == BFile_Type_DotDot)
-			ent->d_type = DT_DIR;
-
 		dp->entries[dp->count++] = ent;
 
 		rc = BFile_FindNext(sd, fc_path, &info);

src/fs/fugue/fugue_rmdir.c

@@ -0,0 +1,51 @@
+#include <gint/hardware.h>
+#include <gint/bfile.h>
+#include <gint/fs.h>
+#include <errno.h>
+#include <dirent.h>
+#include <string.h>
+#include "util.h"
+#include "fugue.h"
+
+int fugue_rmdir(char const *path)
+{
+	ENOTSUP_IF_NOT_FUGUE(-1);
+
+	/* Check if the folder is empty */
+	DIR *dp = opendir(path);
+	if(!dp) return -1;
+
+	bool empty = true;
+	struct dirent *ent;
+
+	while((ent = readdir(dp))) {
+		if(strcmp(ent->d_name, ".") != 0 &&
+		   strcmp(ent->d_name, "..") != 0) {
+			empty = false;
+			break;
+		}
+	}
+
+	closedir(dp);
+
+	if(!empty) {
+		errno = ENOTEMPTY;
+		return -1;
+	}
+
+	uint16_t *fcpath = fs_path_normalize_fc(path);
+	if(!fcpath) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	int rc = BFile_Remove(fcpath);
+	if(rc < 0) {
+		errno = bfile_error_to_errno(rc);
+		rc = -1;
+	}
+	else rc = 0;
+
+	free(fcpath);
+	return rc;
+}

src/fs/fugue/fugue_stat.c

@@ -0,0 +1,36 @@
+#include <sys/stat.h>
+#include <gint/fs.h>
+#include <gint/bfile.h>
+#include "fugue.h"
+#include <errno.h>
+#include <stdlib.h>
+#include "util.h"
+
+int fugue_stat(char const * restrict path, struct stat * restrict statbuf)
+{
+	ENOTSUP_IF_NOT_FUGUE(-1);
+
+	uint16_t *fcpath = fs_path_normalize_fc(path);
+	if(!fcpath) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	int type, size, rc;
+	rc = BFile_Ext_Stat(fcpath, &type, &size);
+	free(fcpath);
+
+	if(rc < 0) {
+		errno = bfile_error_to_errno(rc);
+		return -1;
+	}
+
+	statbuf->st_mode = bfile_type_to_mode_t(type) | 0777;
+	statbuf->st_size = -1;
+
+	if(S_ISREG(statbuf->st_mode)) {
+		statbuf->st_size = size;
+	}
+
+	return 0;
+}

src/fs/fugue/fugue_unlink.c

@@ -2,6 +2,7 @@
 #include <gint/bfile.h>
 #include <gint/fs.h>
 #include <errno.h>
+#include <sys/stat.h>
 #include "util.h"
 
 int fugue_unlink(char const *path)
@@ -14,18 +15,27 @@ int fugue_unlink(char const *path)
 		return -1;
 	}
 
-	int err = BFile_Remove(fcpath);
-	if(err < 0) {
-		errno = bfile_error_to_errno(err);
-		free(fcpath);
-		return -1;
+	int type, size, rc;
+	rc = BFile_Ext_Stat(fcpath, &type, &size);
+	if(rc < 0) {
+		errno = bfile_error_to_errno(rc);
+		rc = -1;
+		goto end;
+	}
+	if(bfile_type_to_mode_t(type) != S_IFREG) {
+		errno = ENOTDIR;
+		rc = -1;
+		goto end;
 	}
 
-	free(fcpath);
-	return 0;
-}
+	rc = BFile_Remove(fcpath);
+	if(rc < 0) {
+		errno = bfile_error_to_errno(rc);
+		rc = -1;
+	}
+	else rc = 0;
 
-int fugue_rmdir(char const *path)
-{
-	return fugue_unlink(path);
+end:
+	free(fcpath);
+	return rc;
 }

src/fs/fugue/util.c

@@ -4,6 +4,8 @@
 #include <errno.h>
 #include <stdarg.h>
 #include <gint/bfile.h>
+#include <dirent.h>
+#include <sys/stat.h>
 
 int bfile_error_to_errno(int e)
 {
@@ -26,6 +28,32 @@ int bfile_error_to_errno(int e)
 	}
 }
 
+int bfile_type_to_mode_t(int bfile_type)
+{
+	switch(bfile_type) {
+	case BFile_Type_Directory:      return S_IFDIR;
+	case BFile_Type_Dot:            return S_IFDIR;
+	case BFile_Type_DotDot:         return S_IFDIR;
+	case BFile_Type_MainMem:        return S_IFBLK;
+	case BFile_Type_File:           return S_IFREG;
+	case BFile_Type_Archived:       return S_IFREG;
+	default:                        return S_IFREG;
+	}
+}
+
+int bfile_type_to_dirent(int bfile_type)
+{
+	switch(bfile_type) {
+	case BFile_Type_Directory:      return DT_DIR;
+	case BFile_Type_Dot:            return DT_DIR;
+	case BFile_Type_DotDot:         return DT_DIR;
+	case BFile_Type_MainMem:        return DT_BLK;
+	case BFile_Type_File:           return DT_REG;
+	case BFile_Type_Archived:       return DT_REG;
+	default:                        return DT_UNKNOWN;
+	}
+}
+
 /* Length of FONTCHARACTER and UTF-8 strings, counting only ASCII characters */
 size_t utf8_len(char const *utf8)
 {

src/fs/fugue/util.h

@@ -16,6 +16,12 @@ extern "C" {
 /* Translate common BFile error codes to errno values. */
 int bfile_error_to_errno(int bfile_error_code);
 
+/* Translate BFile file types to st_mode values. */
+int bfile_type_to_mode_t(int bfile_type);
+
+/* Translate BFile file types to struct dirent values. */
+int bfile_type_to_dirent(int bfile_type);
+
 /* TODO: These functions do not actually translate special characters between
    encodings, they simply strip them. */
 

src/fs/stat.c

@@ -0,0 +1,8 @@
+#include <sys/stat.h>
+#include "fugue/fugue.h"
+
+int stat(char const * restrict path, struct stat * restrict statbuf)
+{
+	/* Standard stat() is the Fugue filesystem only */
+	return fugue_stat(path, statbuf);
+}