Link MSL_C/FILE_POS

2026-05-23 06:34:18 -04:00 · 2025-07-04 18:36:30 -04:00
parent cd52246e9c
commit 1ef780a10f
2 changed files with 119 additions and 1 deletions
@@ -0,0 +1,118 @@
+#include "types.h"
+
+#ifndef _MSL_WIDE_CHAR
+#define _MSL_WIDE_CHAR
+#endif
+
+#include "MSL_C/ansi_files.h"
+#include "errno.h"
+
+// define standard C file pointer location names
+#define SEEK_SET (0)
+#define SEEK_CUR (1)
+#define SEEK_END (2)
+
+int _ftell(FILE* file) {
+	int charsInUndoBuffer = 0;
+	int position;
+
+	u8 tmp_kind = file->file_mode.file_kind;
+	if (!(tmp_kind == __disk_file || tmp_kind == __console_file) || file->file_state.error) {
+		errno = 0x28;
+		return -1;
+	}
+
+	if (file->file_state.io_state == __neutral)
+		return (file->position);
+
+	position = file->buffer_position + (file->buffer_ptr - file->buffer);
+
+	if (file->file_state.io_state >= __rereading) {
+		charsInUndoBuffer = file->file_state.io_state - __rereading + 1;
+		position -= charsInUndoBuffer;
+	}
+
+	return (position);
+}
+
+int ftell(FILE* stream) {
+	int retval;
+
+	retval = (s32)_ftell(stream);
+	return retval;
+}
+
+int _fseek(FILE* file, u32 offset, int whence) {
+    int adjust;
+    u32 state;
+    int buffLen;
+    
+    if (file->file_mode.file_kind != 1 || file->file_state.error != 0) {
+        errno = 0x28;
+        return -1;
+    }
+
+    if (file->file_state.io_state == 1) {
+        if (__flush_buffer(file, nullptr) != 0) {
+            file->file_state.error = 1;
+            file->buffer_length = 0;
+            errno = 0x28;
+            return -1;
+        }
+    }
+
+    if (whence == SEEK_CUR) {
+        whence = SEEK_SET;
+        if ((file->file_mode.file_kind != 1 && file->file_mode.file_kind != 2) || file->file_state.error != 0) {
+            errno = 0x28;
+            adjust = -1;
+        } else {
+            state = file->file_state.io_state;
+            if (state == 0) {
+                adjust = file->position;
+            } else {
+                adjust = file->buffer_position + (u32)(file->buffer_ptr - file->buffer);
+                if ((state >= 3)) {
+                    adjust -= (state - 2);
+                }
+            }
+        }
+        offset += adjust;
+    } 
+    
+    if ((whence != SEEK_END) &&
+            (file->file_mode.io_mode != 3) &&
+            (file->file_state.io_state == 2 || file->file_state.io_state == 3)) {
+        if ((offset >= file->position) || !(offset >= file->buffer_position)) {
+            file->file_state.io_state = 0;
+        } else {
+            file->buffer_ptr = file->buffer + (offset - file->buffer_position);
+            file->buffer_length =  file->position - offset;
+            file->file_state.io_state = 2;
+        }
+    } else {
+        file->file_state.io_state = 0;
+    }
+
+    if (file->file_state.io_state == 0) {
+        if (file->position_fn != nullptr && (int)file->position_fn(file->handle, &offset, whence, file->idle_fn)) {
+            file->file_state.error = 1;
+            file->buffer_length = 0;
+            errno = 0x28;
+            return -1;
+        } else {
+            file->file_state.eof = 0;
+            file->position = offset;
+            file->buffer_length = 0;
+        }
+    } 
+    
+    return 0;
+}
+
+int fseek(FILE* stream, u32 offset, int whence) {
+	int code;
+
+	code = _fseek(stream, offset, whence); // 0 if successful, -1 if error
+	return code;
+}