Save stage

build.sh

@@ -1,10 +1,11 @@
 bcc -S main.c
 echo -e "push bp
 mov bp,sp
+push 10[bp]
 push 8[bp]
 push 6[bp]
 call _main
-add sp, #0x4
+add sp, #0x6
 pop bp
 retf\n $(cat main.s)" > main.s
 sed -i '/.globl	___mkargv/d' ./main.s

main.c

@@ -4,6 +4,7 @@
 //
 
 #include "std_singos/string.h"
+#include "std_singos/stdio.h"
 #include "driver/disk.h"
 
 #define SPACE_MBR_RECORD 2048 // Sectors
@@ -28,6 +29,7 @@ typedef struct File_System_Control_Information FSCI;
 typedef struct meta_information_format mif;
 typedef struct tag_record tag_record;
 typedef struct lsfs_file lsfs_file;
+typedef struct Parameter_Struct Parameter_Struct;
 
 typedef enum Table_Entry_Kind
 {
@@ -46,9 +48,6 @@ typedef enum Service_Action
 
 } Service_Action;
 
-int number_low;
-int selector;
-
 struct Struct_Table_Entry 
 {
     char    filename[256]; 
@@ -86,12 +85,22 @@ typedef struct Directory_Table
 
 }; 
 
+struct Parameter_Struct 
+{
+    char* path;
+    char* new_path;
+    int buffer_segment;
+    int buffer_address;
+    int buffer_size;
+    int data_length;
+    int byte_offset_into_file;
+    Table_Entry_Kind entry_kind;
+};
 
-void print(string);
-
-int main(selector, parameter_struct) 
+int main(selector, pointer_parameter_segment, pointer_parameter_struct) 
 int selector;
-void* parameter_struct;
+void* pointer_parameter_segment;
+void* pointer_parameter_struct;
 {
     // selectot should be a "selector" for which disk service
     // one wnats to use. 
@@ -99,6 +108,7 @@ void* parameter_struct;
     FSCI fsci;
     Service_Action service_action;
     Directory_Table current_table;
+    Parameter_Struct parameter_struct;
     int local_segment = 0x7e0;
     int stack_segment = 0x8fc0;
     long index_as_long; 
@@ -114,7 +124,7 @@ void* parameter_struct;
                 What do we need to know: 
                 Index of FSCI
             */
-            index_as_long = parameter_struct;
+            index_as_long = pointer_parameter_struct;
             disk_service_read_data_from_disk(index_as_long, 1, &fsci, stack_segment);
             print("File System has been loaded: ");
             print_newline();
@@ -123,6 +133,9 @@ void* parameter_struct;
         } break;
         case SERVICE_FIND_ENTRY:
         {
+            memcpy(&parameter_struct, stack_segment, pointer_parameter_struct, pointer_parameter_segment, sizeof(Parameter_Struct));
+            dump_ax(parameter_struct.buffer_size);
+            print_newline();
             disk_service_read_data_from_disk(fsci.master_table_index[0], DEFAULT_TABLE_SIZE, &current_table, stack_segment);
             print("Current table: ");
             print_newline();
@@ -141,6 +154,8 @@ void* parameter_struct;
                     // Buffer: 
                     destination_segment
                     destination_address
+                    buffer_size
+                    offset_into_file
             */
             print("Hit READ case");
         } break;
@@ -159,67 +174,3 @@ void* parameter_struct;
 }
 
 //void load_
-
-
-void print(string)
-char* string;
-{
-#asm 
-    push bp
-    mov bp,sp
-    mov si,4[bp]
-    call 0x0000:0x7C47
-    pop bp
-#endasm
-}
-
-void print_stack(argument)
-{
-#asm 
-    push bp
-    mov bp,sp
-    push ds
-    push ax
-
-    mov ax, ss
-    mov ds, ax
-    mov si,4[bp]
-    call 0x0000:0x7C47
-    
-    pop ax
-    pop ds
-    pop bp
-#endasm
-}
-
-dump_ax_return(input)
-void* input;
-{
-    return input;
-}
-
-void dump_ax(input)
-void* input;
-{
-    // Force the variable in ax 
-    dump_ax_return(input)
-#asm
-    push bp
-    mov bp,sp
-    call 0x000:0x7C2A
-    pop bp
-#endasm
-}
-
-void print_newline()
-{
-    #asm 
-    printCRLF:
-    mov ah, #0xE
-    mov al, #13
-    int #0x10
-    mov al, #10
-    int #0x10
-    ret
-    #endasm
-}

std_singos/stdio.h

@@ -0,0 +1,64 @@
+void print(string);
+
+void print(string)
+char* string;
+{
+#asm 
+    push bp
+    mov bp,sp
+    mov si,4[bp]
+    call 0x0000:0x7C47
+    pop bp
+#endasm
+}
+
+void print_stack(argument)
+{
+#asm 
+    push bp
+    mov bp,sp
+    push ds
+    push ax
+
+    mov ax, ss
+    mov ds, ax
+    mov si,4[bp]
+    call 0x0000:0x7C47
+    
+    pop ax
+    pop ds
+    pop bp
+#endasm
+}
+
+dump_ax_return(input)
+void* input;
+{
+    return input;
+}
+
+void dump_ax(input)
+void* input;
+{
+    // Force the variable in ax 
+    dump_ax_return(input)
+#asm
+    push bp
+    mov bp,sp
+    call 0x000:0x7C2A
+    pop bp
+#endasm
+}
+
+void print_newline()
+{
+    #asm 
+    printCRLF:
+    mov ah, #0xE
+    mov al, #13
+    int #0x10
+    mov al, #10
+    int #0x10
+    ret
+    #endasm
+}

std_singos/string.h

@@ -1,4 +1,5 @@
 void strcpy (destination, destination_segment, source, source_segment );
+void memcpy (destination, destination_segment, source, source_segment, num_bytes );
 
 void strcpy (destination, destination_segment, source, source_segment )
 char *destination;
@@ -52,3 +53,58 @@ int source_segment;
 
     #endasm
 }
+
+void memcpy (destination, destination_segment, source, source_segment, num_bytes)
+void *destination;
+int destination_segment;
+void *source;
+int source_segment;
+int num_bytes;
+{
+    #asm
+    ; copy two strings
+    ; IN si: the first (zero terminated) string
+    ; IN di: the second (zero terminated) string
+    ; OUT SF and ZF (same semantics as cmp)
+    
+    #define DESTINATION 4[bp];
+    #define DESTINATION_SEGMENT 6[bp];
+    #define SOURCE 8[bp];
+    #define SOURCE_SEGMENT 10[bp];
+    #define NUM_BYTES 12[bp];
+
+    push bp
+    mov bp,sp
+    memcpy:
+        push ax
+        push bx
+        push di
+        push es
+        push si
+        push ds
+        mov ax, DESTINATION; 
+        mov di, ax
+        mov ax, DESTINATION_SEGMENT; 
+        mov es, ax
+        mov ax, SOURCE; 
+        mov si, ax
+        mov ax, SOURCE_SEGMENT; 
+        mov ds, ax
+        mov cx, NUM_BYTES
+    .memcpy_loop:
+        movsb
+        cmp cx, 0x0
+        je .end
+        dec cx
+        jmp .loop
+    .memcpy_end:
+        pop ds
+        pop si
+        pop es
+        pop di
+        pop bx
+        pop ax
+        pop bp
+
+    #endasm
+}