Return parent directory to new file in RAMFS

src/bootloader/main.s

@@ -21,13 +21,16 @@ bits 16
 ;Load part2                                 |x|
 ;Get video mode information                 |0|
 ;Set video mode                             |0|
-;get memory map                             |0|
-;enable paging                              |0|
-;read filesystem                            |0|
-;load kernel                                |0|
-;parse ELF format                           |0|
-;pass memory and video information to kernel|0|
-;relocate and jump to kernel                |0|
+;get memory map                             |x|
+;enable paging                              |x|
+;read filesystem                            |x|
+;load kernel                                |x|
+;parse ELF format                           |x|
+;pass memory and video information to kernel|x|
+;relocate and jump to kernel                |x|
+
+;TODO 7/4/26
+;Remember to ZERO THE BSS
 
 jump:
     jmp short start

src/kernel/shared/kstdlib.h

@@ -4,6 +4,12 @@
 #include "../drivers/serial.h"
 #include "interrupts.h"
 
+#define true 1
+#define false 0
+
+#define null 0
+
+
 #define MLOG_DEBUG 1
 #define MLOG_PRINT 2
 #define MLOG_WARN 3

src/kernel/system/ramfs.c

@@ -3,7 +3,7 @@
 #include "../shared/kstdlib.h"
 #include "../shared/memory.h"
 #include "../shared/string.h"
-#define MODULE_NAME "KVFS"
+#define MODULE_NAME "RAMFS"
 
 fileops_t ramfs_ops = 
 {
@@ -21,16 +21,22 @@ vfile_t root_dir = {"/", FS_FILE_IS_DIR | FS_FILE_SYSTEM, &ramfs_ops};
 void ramfs_init(){
     mlog(MODULE_NAME, "Initializing VFS\n", MLOG_PRINT);
     root_dir.private = kmalloc(1);
-    root_dir.size = PAGE_SIZE_BYTES;//one page is 4096 bytes
+    root_dir.size = PAGE_SIZE_BYTES;
     // printf("Sizeof VFILE_T: %d", sizeof(vfile_t));
 }
 
 vfile_t *search_dir(char *subname, vfile_t *directory){
-    
+    vfile_t **children = (vfile_t **)directory->private;
+    for(int i = 0; i < directory->size / sizeof(vfile_t *); i++){
+        if(!strcmp(children[i], subname)){
+            return children[i];
+        }
+    }
+    return 0;
 }
 
 //resolves the path relative to start
-vfile_t *resolve_path(char *pathname, vfile_t *start){
+vfile_t *resolve_path(char *pathname, vfile_t *start, uint32_t get_last_child){
     const uint32_t MAX_TOKENS = PAGE_SIZE_BYTES/4;
     
     if(!start){
@@ -58,18 +64,36 @@ vfile_t *resolve_path(char *pathname, vfile_t *start){
     }
     
     vfile_t **buffer = (vfile_t **)start->private;
-    printf("START\n");
     vfile_t *entry = start;
-    for(int i = 0; i < pathname_entries - 1; i++){
+    for(int i = 0; i < pathname_entries - !get_last_child; i++){
         printf("%s", path_tokens[i]);
-        
+        entry = search_dir(path_tokens[i], entry);
+        if(!entry){
+            break;
+        }
     }
-    printf("END\n");
+    kfree(path);
+    kfree(path_tokens);
+    return entry;
 }
 
+char *get_filename(char *path){
+    char *filename = path + strlen(path) - 1;//get last character in pathname
+    while(*filename != '/' || filename == path) filename--;
+    filename += filename != path;//if the new filename is at the beginning of the path, don't adjust for '/' character
+    return filename;
+}
 
 vfile_t *ramfs_create(char *path, FS_FILE_FLAGS flags){
-    resolve_path("test/test1/test2", &root_dir);
+    if(!path){
+        return 0;
+    }
+    vfile_t *parent = resolve_path(path, &root_dir, false);
+    if(!parent){
+        mlog(MODULE_NAME, "Could not locate parent directory for %s\n", MLOG_PRINT, path);
+    }
+    get_filename(path);
+    
     return 0;
 }