From c84c9bed296542b07a7e2def6fa311b430be43ba Mon Sep 17 00:00:00 2001
From: Sergiusz Bazanski <q3k@q3k.org>
Date: Mon, 29 Jul 2019 12:22:26 +0200
Subject: [PATCH] epicardium: naive seek and tell implementation
---
epicardium/epicardium.h | 10 ++++++++--
epicardium/modules/fatfs.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+), 2 deletions(-)
diff --git a/epicardium/epicardium.h b/epicardium/epicardium.h
index 9c4a770d..26bdceb7 100644
--- a/epicardium/epicardium.h
+++ b/epicardium/epicardium.h
@@ -54,8 +54,8 @@ typedef unsigned int size_t;
#define API_FILE_READ 0x32
#define API_FILE_WRITE 0x34
#define API_FILE_FLUSH 0x35
-#define API_FILE_SEEK 0x36 //NYI
-#define API_FILE_TELL 0x37 //NYI
+#define API_FILE_SEEK 0x36
+#define API_FILE_TELL 0x37
#define API_FILE_STAT 0x38
/* clang-format on */
@@ -483,6 +483,12 @@ API(
/** */
API(API_FILE_FLUSH, int epic_file_flush(int fd));
+/** */
+API(API_FILE_SEEK, int epic_file_seek(int fd, long offset, int whence));
+
+/** */
+API(API_FILE_TELL, int epic_file_tell(int fd));
+
/** */
enum epic_stat_type {
/** */
diff --git a/epicardium/modules/fatfs.c b/epicardium/modules/fatfs.c
index 649ba730..5641a5c6 100644
--- a/epicardium/modules/fatfs.c
+++ b/epicardium/modules/fatfs.c
@@ -326,6 +326,44 @@ int epic_file_flush(int fd)
return 0;
}
+int epic_file_seek(int fd, long offset, int whence)
+{
+ int res;
+ struct FatObject *o;
+ res = get_fat_object(fd, FO_File, &o);
+ if (res) {
+ return -res;
+ }
+
+ switch (whence) {
+ case SEEK_SET:
+ res = f_lseek(&o->file, offset);
+ return -fresult_to_errno_table[res];
+ case SEEK_CUR:
+ res = f_lseek(&o->file, f_tell(&o->file) + offset);
+ return -fresult_to_errno_table[res];
+ case SEEK_END:
+ res = f_lseek(&o->file, f_size(&o->file) + offset);
+ return -fresult_to_errno_table[res];
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int epic_file_tell(int fd)
+{
+ int res;
+ struct FatObject *o;
+ res = get_fat_object(fd, FO_File, &o);
+ if (res) {
+ errno = -res;
+ return -1;
+ }
+
+ return f_tell(&o->file);
+}
+
int epic_file_stat(const char *filename, epic_stat_t *stat)
{
int res;
--
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