Control cache with refcnt, convert to unix format

The cache now is only freed when there are no references to it (i.e. if
for some reason multile SD objects were used).

Files in SD/src/utility converted to UNIX format (matching other libs)

Author: earlephilhower

libraries/SD/src/utility/FatStructs.h

@@ -1,75 +1,75 @@
-/* Arduino SdFat Library
- * Copyright (C) 2008 by William Greiman
- *
- * This file is part of the Arduino SdFat Library
- *
- * This Library is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This Library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
-
- * You should have received a copy of the GNU General Public License
- * along with the Arduino SdFat Library.  If not, see
- * <http://www.gnu.org/licenses/>.
- */
-#ifndef SdFatUtil_h
-#define SdFatUtil_h
-/**
- * \file
- * Useful utility functions.
- */
-#include <Arduino.h>
-#ifdef __AVR__
-#include <avr/pgmspace.h>
-/** Store and print a string in flash memory.*/
-#define PgmPrint(x) SerialPrint_P(PSTR(x))
-/** Store and print a string in flash memory followed by a CR/LF.*/
-#define PgmPrintln(x) SerialPrintln_P(PSTR(x))
-/** Defined so doxygen works for function definitions. */
-#endif
-#define NOINLINE __attribute__((noinline,unused))
-#define UNUSEDOK __attribute__((unused))
-//------------------------------------------------------------------------------
-/** Return the number of bytes currently free in RAM. */
-static UNUSEDOK int FreeRam(void) {
-  extern int  __bss_end;
-  extern int* __brkval;
-  int free_memory;
-  if (reinterpret_cast<int>(__brkval) == 0) {
-    // if no heap use from end of bss section
-    free_memory = reinterpret_cast<int>(&free_memory)
-                  - reinterpret_cast<int>(&__bss_end);
-  } else {
-    // use from top of stack to heap
-    free_memory = reinterpret_cast<int>(&free_memory)
-                  - reinterpret_cast<int>(__brkval);
-  }
-  return free_memory;
-}
-#ifdef __AVR__
-//------------------------------------------------------------------------------
-/**
- * %Print a string in flash memory to the serial port.
- *
- * \param[in] str Pointer to string stored in flash memory.
- */
-static NOINLINE void SerialPrint_P(PGM_P str) {
-  for (uint8_t c; (c = pgm_read_byte(str)); str++) Serial.write(c);
-}
-//------------------------------------------------------------------------------
-/**
- * %Print a string in flash memory followed by a CR/LF.
- *
- * \param[in] str Pointer to string stored in flash memory.
- */
-static NOINLINE void SerialPrintln_P(PGM_P str) {
-  SerialPrint_P(str);
-  Serial.println();
-}
-#endif  // __AVR__
-#endif  // #define SdFatUtil_h
+/* Arduino SdFat Library
+ * Copyright (C) 2008 by William Greiman
+ *
+ * This file is part of the Arduino SdFat Library
+ *
+ * This Library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This Library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with the Arduino SdFat Library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+#ifndef SdFatUtil_h
+#define SdFatUtil_h
+/**
+ * \file
+ * Useful utility functions.
+ */
+#include <Arduino.h>
+#ifdef __AVR__
+#include <avr/pgmspace.h>
+/** Store and print a string in flash memory.*/
+#define PgmPrint(x) SerialPrint_P(PSTR(x))
+/** Store and print a string in flash memory followed by a CR/LF.*/
+#define PgmPrintln(x) SerialPrintln_P(PSTR(x))
+/** Defined so doxygen works for function definitions. */
+#endif
+#define NOINLINE __attribute__((noinline,unused))
+#define UNUSEDOK __attribute__((unused))
+//------------------------------------------------------------------------------
+/** Return the number of bytes currently free in RAM. */
+static UNUSEDOK int FreeRam(void) {
+  extern int  __bss_end;
+  extern int* __brkval;
+  int free_memory;
+  if (reinterpret_cast<int>(__brkval) == 0) {
+    // if no heap use from end of bss section
+    free_memory = reinterpret_cast<int>(&free_memory)
+                  - reinterpret_cast<int>(&__bss_end);
+  } else {
+    // use from top of stack to heap
+    free_memory = reinterpret_cast<int>(&free_memory)
+                  - reinterpret_cast<int>(__brkval);
+  }
+  return free_memory;
+}
+#ifdef __AVR__
+//------------------------------------------------------------------------------
+/**
+ * %Print a string in flash memory to the serial port.
+ *
+ * \param[in] str Pointer to string stored in flash memory.
+ */
+static NOINLINE void SerialPrint_P(PGM_P str) {
+  for (uint8_t c; (c = pgm_read_byte(str)); str++) Serial.write(c);
+}
+//------------------------------------------------------------------------------
+/**
+ * %Print a string in flash memory followed by a CR/LF.
+ *
+ * \param[in] str Pointer to string stored in flash memory.
+ */
+static NOINLINE void SerialPrintln_P(PGM_P str) {
+  SerialPrint_P(str);
+  Serial.println();
+}
+#endif  // __AVR__
+#endif  // #define SdFatUtil_h