From 6f51733e926b83a165eb71f33fed122c7c75f46f Mon Sep 17 00:00:00 2001
From: Scott Duensing <scott@kangaroopunch.com>
Date: Tue, 23 Jan 2024 19:31:03 -0600
Subject: [PATCH] fseek and rewind added.  No support for ftell in the
 microkernel.

---
 f256lib/api.h  |  4 ++--
 f256lib/file.c | 12 ++++++++++++
 f256lib/file.h | 28 ++++++++++++++++------------
 3 files changed, 30 insertions(+), 14 deletions(-)

diff --git a/f256lib/api.h b/f256lib/api.h
index 7729a84..3dec230 100644
--- a/f256lib/api.h
+++ b/f256lib/api.h
@@ -183,9 +183,9 @@ struct fs_delete_t {
 };
 
 struct fs_seek_t {
-    uint8_t  streak;
+    uint8_t  stream;
     uint8_t  cookie;
-    uint32_t position;
+    uint32_t offset;
 };
 
 struct file_t {
diff --git a/f256lib/file.c b/f256lib/file.c
index df6bbdc..26568ae 100644
--- a/f256lib/file.c
+++ b/f256lib/file.c
@@ -279,6 +279,18 @@ void fileReset(void) {
 }
 
 
+int16_t fileSeek(uint8_t id, uint32_t offset, uint8_t whence) {
+	if (whence != SEEK_SET) return -1;
+
+	kernelArgs->file.seek.stream = id;
+	kernelArgs->file.seek.offset = offset;
+	kernelCall(File.Seek);
+	if (kernelError) return -1;
+
+	return 0;
+}
+
+
 int16_t fileUnlink(char *name) {
 	char drive;
 	char stream;
diff --git a/f256lib/file.h b/f256lib/file.h
index 2a6e980..5e5108e 100644
--- a/f256lib/file.h
+++ b/f256lib/file.h
@@ -53,6 +53,7 @@ int16_t      fileRead(void *buf, uint16_t nbytes, uint16_t nmemb, uint8_t fd);
 fileDirEntT *fileReadDir(fileDirT *dir);
 int16_t      fileRename(char *name, char *to);
 void         fileReset(void);
+int16_t      fileSeek(uint8_t id, uint32_t offset, uint8_t whence);
 int16_t      fileUnlink(char *name);
 int16_t      fileWrite(void *buf, uint16_t nbytes, uint16_t nmemb, uint8_t fd);
 
@@ -65,18 +66,21 @@ int16_t      fileWrite(void *buf, uint16_t nbytes, uint16_t nmemb, uint8_t fd);
 
 // Aliases to the standard names if they don't exist.
 #ifndef DIR
-#define close     fileClose
-#define closedir  fileCloseDir
-#define DIR       fileDirT
-#define dirent    fileDirEntS
-#define FILE      uint8_t
-#define fopen     fileOpen
-#define fread     fileRead
-#define fwrite    fileWrite
-#define opendir   fileOpenDir
-#define readdir   fileReadDir
-#define rename    fileRename
-#define unlink    fileUnlink
+#define close      fileClose
+#define closedir   fileCloseDir
+#define DIR        fileDirT
+#define dirent     fileDirEntS
+#define FILE       uint8_t
+#define fopen      fileOpen
+#define fread      fileRead
+#define fseek      fileSeek
+#define fwrite     fileWrite
+#define opendir    fileOpenDir
+#define readdir    fileReadDir
+#define rename     fileRename
+#define rewind(s)  (void)fileSeek(s, 0, SEEK_SET)
+#define SEEK_SET   0
+#define unlink     fileUnlink
 #endif