vfs: define all implementations as esp_vfs_, create aliases

This change allows (in the future) to test VFS on host, without having
it conflict with the host C library. On host, all aliases would be
disabled.

components/vfs/vfs.c

@@ -631,35 +631,7 @@ int esp_vfs_rename(struct _reent *r, const char *src, const char *dst)
     return ret;
 }
 
-/* Create aliases for newlib syscalls
-
-   These functions are also available in ROM as stubs which use the syscall table, but linking them
-   directly here saves an additional function call when a software function is linked to one, and
-   makes linking with -stdlib easier.
- */
-int _open_r(struct _reent *r, const char * path, int flags, int mode)
-    __attribute__((alias("esp_vfs_open")));
-ssize_t _write_r(struct _reent *r, int fd, const void * data, size_t size)
-    __attribute__((alias("esp_vfs_write")));
-off_t _lseek_r(struct _reent *r, int fd, off_t size, int mode)
-    __attribute__((alias("esp_vfs_lseek")));
-ssize_t _read_r(struct _reent *r, int fd, void * dst, size_t size)
-    __attribute__((alias("esp_vfs_read")));
-int _close_r(struct _reent *r, int fd)
-    __attribute__((alias("esp_vfs_close")));
-int _fstat_r(struct _reent *r, int fd, struct stat * st)
-    __attribute__((alias("esp_vfs_fstat")));
-int _stat_r(struct _reent *r, const char * path, struct stat * st)
-    __attribute__((alias("esp_vfs_stat")));
-int _link_r(struct _reent *r, const char* n1, const char* n2)
-    __attribute__((alias("esp_vfs_link")));
-int _unlink_r(struct _reent *r, const char *path)
-    __attribute__((alias("esp_vfs_unlink")));
-int _rename_r(struct _reent *r, const char *src, const char *dst)
-    __attribute__((alias("esp_vfs_rename")));
-
-
-DIR* opendir(const char* name)
+DIR* esp_vfs_opendir(const char* name)
 {
     const vfs_entry_t* vfs = get_vfs_for_path(name);
     struct _reent* r = __getreent();
@@ -676,7 +648,7 @@ DIR* opendir(const char* name)
     return ret;
 }
 
-struct dirent* readdir(DIR* pdir)
+struct dirent* esp_vfs_readdir(DIR* pdir)
 {
     const vfs_entry_t* vfs = get_vfs_for_index(pdir->dd_vfs_idx);
     struct _reent* r = __getreent();
@@ -689,7 +661,7 @@ struct dirent* readdir(DIR* pdir)
     return ret;
 }
 
-int readdir_r(DIR* pdir, struct dirent* entry, struct dirent** out_dirent)
+int esp_vfs_readdir_r(DIR* pdir, struct dirent* entry, struct dirent** out_dirent)
 {
     const vfs_entry_t* vfs = get_vfs_for_index(pdir->dd_vfs_idx);
     struct _reent* r = __getreent();
@@ -702,7 +674,7 @@ int readdir_r(DIR* pdir, struct dirent* entry, struct dirent** out_dirent)
     return ret;
 }
 
-long telldir(DIR* pdir)
+long esp_vfs_telldir(DIR* pdir)
 {
     const vfs_entry_t* vfs = get_vfs_for_index(pdir->dd_vfs_idx);
     struct _reent* r = __getreent();
@@ -715,7 +687,7 @@ long telldir(DIR* pdir)
     return ret;
 }
 
-void seekdir(DIR* pdir, long loc)
+void esp_vfs_seekdir(DIR* pdir, long loc)
 {
     const vfs_entry_t* vfs = get_vfs_for_index(pdir->dd_vfs_idx);
     struct _reent* r = __getreent();
@@ -726,12 +698,12 @@ void seekdir(DIR* pdir, long loc)
     CHECK_AND_CALLV(r, vfs, seekdir, pdir, loc);
 }
 
-void rewinddir(DIR* pdir)
+void esp_vfs_rewinddir(DIR* pdir)
 {
     seekdir(pdir, 0);
 }
 
-int closedir(DIR* pdir)
+int esp_vfs_closedir(DIR* pdir)
 {
     const vfs_entry_t* vfs = get_vfs_for_index(pdir->dd_vfs_idx);
     struct _reent* r = __getreent();
@@ -744,7 +716,7 @@ int closedir(DIR* pdir)
     return ret;
 }
 
-int mkdir(const char* name, mode_t mode)
+int esp_vfs_mkdir(const char* name, mode_t mode)
 {
     const vfs_entry_t* vfs = get_vfs_for_path(name);
     struct _reent* r = __getreent();
@@ -758,7 +730,7 @@ int mkdir(const char* name, mode_t mode)
     return ret;
 }
 
-int rmdir(const char* name)
+int esp_vfs_rmdir(const char* name)
 {
     const vfs_entry_t* vfs = get_vfs_for_path(name);
     struct _reent* r = __getreent();
@@ -772,7 +744,7 @@ int rmdir(const char* name)
     return ret;
 }
 
-int access(const char *path, int amode)
+int esp_vfs_access(const char *path, int amode)
 {
     int ret;
     const vfs_entry_t* vfs = get_vfs_for_path(path);
@@ -786,7 +758,7 @@ int access(const char *path, int amode)
     return ret;
 }
 
-int truncate(const char *path, off_t length)
+int esp_vfs_truncate(const char *path, off_t length)
 {
     int ret;
     const vfs_entry_t* vfs = get_vfs_for_path(path);
@@ -1198,9 +1170,76 @@ int tcsendbreak(int fd, int duration)
 #endif // CONFIG_VFS_SUPPORT_TERMIOS
 
 
+/* Create aliases for newlib syscalls
 
+   These functions are also available in ROM as stubs which use the syscall table, but linking them
+   directly here saves an additional function call when a software function is linked to one, and
+   makes linking with -stdlib easier.
+ */
+#ifdef CONFIG_VFS_SUPPORT_IO
+int _open_r(struct _reent *r, const char * path, int flags, int mode)
+    __attribute__((alias("esp_vfs_open")));
+int _close_r(struct _reent *r, int fd)
+    __attribute__((alias("esp_vfs_close")));
+ssize_t _read_r(struct _reent *r, int fd, void * dst, size_t size)
+    __attribute__((alias("esp_vfs_read")));
+ssize_t _write_r(struct _reent *r, int fd, const void * data, size_t size)
+    __attribute__((alias("esp_vfs_write")));
+ssize_t pread(int fd, void *dst, size_t size, off_t offset)
+    __attribute__((alias("esp_vfs_pread")));
+ssize_t pwrite(int fd, const void *src, size_t size, off_t offset)
+    __attribute__((alias("esp_vfs_pwrite")));
+off_t _lseek_r(struct _reent *r, int fd, off_t size, int mode)
+    __attribute__((alias("esp_vfs_lseek")));
+int _fcntl_r(struct _reent *r, int fd, int cmd, int arg)
+    __attribute__((alias("esp_vfs_fcntl_r")));
+int _fstat_r(struct _reent *r, int fd, struct stat * st)
+    __attribute__((alias("esp_vfs_fstat")));
+int fsync(int fd)
+    __attribute__((alias("esp_vfs_fsync")));
+int ioctl(int fd, int cmd, ...)
+    __attribute__((alias("esp_vfs_ioctl")));
+#endif // CONFIG_VFS_SUPPORT_IO
 
+#ifdef CONFIG_VFS_SUPPORT_SELECT
+int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout)
+    __attribute__((alias("esp_vfs_select")));
+#endif // CONFIG_VFS_SUPPORT_SELECT
 
+#ifdef CONFIG_VFS_SUPPORT_DIR
+int _stat_r(struct _reent *r, const char * path, struct stat * st)
+    __attribute__((alias("esp_vfs_stat")));
+int _link_r(struct _reent *r, const char* n1, const char* n2)
+    __attribute__((alias("esp_vfs_link")));
+int _unlink_r(struct _reent *r, const char *path)
+    __attribute__((alias("esp_vfs_unlink")));
+int _rename_r(struct _reent *r, const char *src, const char *dst)
+    __attribute__((alias("esp_vfs_rename")));
+int truncate(const char *path, off_t length)
+    __attribute__((alias("esp_vfs_truncate")));
+int access(const char *path, int amode)
+    __attribute__((alias("esp_vfs_access")));
+int utime(const char *path, const struct utimbuf *times)
+    __attribute__((alias("esp_vfs_utime")));
+int rmdir(const char* name)
+    __attribute__((alias("esp_vfs_rmdir")));
+int mkdir(const char* name, mode_t mode)
+    __attribute__((alias("esp_vfs_mkdir")));
+DIR* opendir(const char* name)
+    __attribute__((alias("esp_vfs_opendir")));
+int closedir(DIR* pdir)
+    __attribute__((alias("esp_vfs_closedir")));
+int readdir_r(DIR* pdir, struct dirent* entry, struct dirent** out_dirent)
+    __attribute__((alias("esp_vfs_readdir_r")));
+struct dirent* readdir(DIR* pdir)
+    __attribute__((alias("esp_vfs_readdir")));
+long telldir(DIR* pdir)
+    __attribute__((alias("esp_vfs_telldir")));
+void seekdir(DIR* pdir, long loc)
+    __attribute__((alias("esp_vfs_seekdir")));
+void rewinddir(DIR* pdir)
+    __attribute__((alias("esp_vfs_rewinddir")));
+#endif // CONFIG_VFS_SUPPORT_DIR
 
 void vfs_include_syscalls_impl(void)
 {