Filesystem: Add support for stat

Provided through FileSystemLike::stat

drivers/FileSystemLike.h

@@ -100,7 +100,15 @@ public:
      */
     virtual int mkdir(const char *name, mode_t mode) { (void) name, (void) mode; return -1; }
 
-    // TODO other filesystem functions (mkdir, rm, rn, ls etc)
+    /** Store information about file in stat structure
+     *
+     *  @param name The name of the file to find information about
+     *  @param st The stat buffer to write to
+     *  @returns
+     *    0 on success or un-needed,
+     *   -1 on error
+     */
+    virtual int stat(const char *name, struct stat *st) = 0;
 };
 
 } // namespace mbed

features/filesystem/fat/FATFileSystem.cpp

@@ -182,6 +182,28 @@ int FATFileSystem::mkdir(const char *name, mode_t mode) {
     return res == 0 ? 0 : -1;
 }
 
+int FATFileSystem::stat(const char *name, struct stat *st) {
+    lock();
+    FILINFO f;
+    memset(&f, 0, sizeof(f));
+
+    FRESULT res = f_stat(name, &f);
+    if (res != 0) {
+        unlock();
+        return -1;
+    }
+
+    st->st_size = f.fsize;
+    st->st_mode = 0;
+    st->st_mode |= (f.fattrib & AM_DIR) ? S_IFDIR : S_IFREG;
+    st->st_mode |= (f.fattrib & AM_RDO) ?
+        (S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) :
+        (S_IRWXU | S_IRWXG | S_IRWXO);
+
+    unlock();
+    return 0;
+}
+
 int FATFileSystem::mount() {
     lock();
     FRESULT res = f_mount(&_fs, _fsid, 1);

features/filesystem/fat/FATFileSystem.h

@@ -73,6 +73,11 @@ public:
      */
     virtual int mkdir(const char *name, mode_t mode);
 
+    /**
+     * Store information about file in stat structure
+     */
+    virtual int stat(const char *name, struct stat *st);
+    
     /**
      * Mounts the filesystem
      */

platform/mbed_retarget.cpp

@@ -472,6 +472,14 @@ extern "C" int mkdir(const char *path, mode_t mode) {
     return fs->mkdir(fp.fileName(), mode);
 }
 
+extern "C" int stat(const char *path, struct stat *st) {
+    FilePath fp(path);
+    FileSystemLike *fs = fp.fileSystem();
+    if (fs == NULL) return -1;
+
+    return fs->stat(fp.fileName(), st);
+}
+
 #if defined(TOOLCHAIN_GCC)
 /* prevents the exception handling name demangling code getting pulled in */
 #include "mbed_error.h"