ffat: Enable support for long file names

Fixes #270.

libports/lib/mk/ffat_block.mk

@@ -4,10 +4,11 @@
 
 INC_DIR += $(REP_DIR)/src/lib/ffat/contrib
 
-SRC_C  = ff.c
+SRC_C  = ff.c ccsbcs.c
 SRC_CC = diskio_block.cc
 
 LIBS = signal
 
-vpath % $(REP_DIR)/contrib/ff007e/src
 vpath % $(REP_DIR)/src/lib/ffat/
+vpath % $(REP_DIR)/contrib/ff007e/src
+vpath % $(REP_DIR)/contrib/ff007e/src/option

libports/src/lib/ffat/config.patch

@@ -1,6 +1,6 @@
-diff --git a/src/ffconf.h b/src/ffconf.h
---- a/src/ffconf.h
-+++ b/src/ffconf.h
+diff -urN ff007e.orig/src/ffconf.h ff007e/src/ffconf.h
+--- ff007e.orig/src/ffconf.h	2009-11-03 00:44:22.000000000 +0100
++++ ff007e/src/ffconf.h	2012-07-09 13:08:03.000000000 +0200
 @@ -40,7 +40,7 @@
  /* To enable string functions, set _USE_STRFUNC to 1 or 2. */
  
@@ -19,6 +19,15 @@ diff --git a/src/ffconf.h b/src/ffconf.h
  /* The _CODE_PAGE specifies the OEM code page to be used on the target system.
  /  Incorrect setting of the code page can cause a file open failure.
  /
+@@ -86,7 +86,7 @@
+ */
+ 
+ 
+-#define	_USE_LFN	0		/* 0, 1 or 2 */
++#define	_USE_LFN	1		/* 0, 1 or 2 */
+ #define	_MAX_LFN	255		/* Maximum LFN length to handle (12 to 255) */
+ /* The _USE_LFN option switches the LFN support.
+ /
 @@ -105,7 +105,7 @@
  */
  

libports/src/lib/libc_ffat/plugin.cc

@@ -320,9 +320,10 @@ class Plugin : public Libc::Plugin
 			::memset(dirent, 0, sizeof(struct dirent));
 
 			FILINFO ffat_file_info;
-			FRESULT res;
+			ffat_file_info.lfname = dirent->d_name;
+			ffat_file_info.lfsize = sizeof(dirent->d_name);
 
-			res = f_readdir(_get_ffat_dir(fd), &ffat_file_info);
+			FRESULT res = f_readdir(_get_ffat_dir(fd), &ffat_file_info);
 			switch(res) {
 				case FR_OK:
 					break;
@@ -354,8 +355,9 @@ class Plugin : public Libc::Plugin
 
 			dirent->d_reclen = sizeof(struct dirent);
 
-			::strncpy(dirent->d_name, ffat_file_info.fname,
-			          sizeof(dirent->d_name));
+			if (dirent->d_name[0] == 0) /* use short file name */
+				::strncpy(dirent->d_name, ffat_file_info.fname,
+						  sizeof(dirent->d_name));
 
 			dirent->d_namlen = ::strlen(dirent->d_name);
 
@@ -587,6 +589,9 @@ class Plugin : public Libc::Plugin
 			using namespace Ffat;
 
 			FILINFO file_info;
+			/* the long file name is not used in this function */
+			file_info.lfname = 0;
+			file_info.lfsize = 0;
 
 			FRESULT res = f_stat(path, &file_info);
 

libports/src/test/libc_ffat/main.cc

@@ -23,8 +23,8 @@
 
 
 #define CALL_AND_CHECK(ret, operation, condition, info_string, ...) \
-	ret = operation; \
 	printf("calling " #operation " " info_string "\n", ##__VA_ARGS__); \
+	ret = operation; \
 	if (condition) { \
 		printf(#operation " succeeded\n"); \
 	} else { \
@@ -37,16 +37,20 @@ int main(int argc, char *argv[])
 {
 	int ret, fd;
 
-	char const *dir_name  = "/testdir";
-	char const *file_name = "test.tst";
-	char const *pattern   = "a single line of text";
+	char const *dir_name      = "/testdir";
+	char const *dir_name_long = "testdir long";
+	char const *file_name     = "test.tst";
+	char const *pattern       = "a single line of text";
 
-	/* create directory */
+	/* create directory (short name) */
 	CALL_AND_CHECK(ret, mkdir(dir_name, 0777), ret == 0, "dir_name=%s", dir_name);
 
 	/* change to new directory */
 	CALL_AND_CHECK(ret, chdir(dir_name), ret == 0, "dir_name=%s", dir_name);
 
+	/* create directory (long name) */
+	CALL_AND_CHECK(ret, mkdir(dir_name_long, 0777), ret == 0, "dir_name_long=%s", dir_name_long);
+
 	/* write pattern to a file */
 	CALL_AND_CHECK(fd, open(file_name, O_CREAT | O_WRONLY), fd >= 0, "file_name=%s", file_name);
 	size_t count = strlen(pattern);