Finish fopen in the vfs and hopefully add a working fopen in stdio.c

init/main.c

@@ -132,19 +132,9 @@ vfs_message* make_msg(vfs_message_type type, char* mode, char* path) {
   return msg_data;
 }
 
-int main(char* initrd, uint32_t initrd_sz) {
-  text_fb_info info;
-  info.address=map_phys((void*)0xB8000,10);
-  info.width=80;
-  info.height=25;
-  vga_init(info);
-  vga_write_string("INIT VGA\n");
-  uint32_t datapos=find_loc("vfs",initrd);
-  load_task(datapos,initrd);
-  uint32_t box=mailbox_new(16);
-  yield();
-  vga_write_string("Sending first test message\n");
-  vfs_message* msg_data=make_msg(VFS_OPEN,"r","/dev/sda");
+void test_vfs(char* path,uint32_t box,uint32_t fs_box) {
+  vga_write_string("Sending test message\n");
+  vfs_message* msg_data=make_msg(VFS_OPEN,"r",path);
   Message msg;
   msg.from=box;
   msg.to=1;
@@ -153,24 +143,47 @@ int main(char* initrd, uint32_t initrd_sz) {
   mailbox_send_msg(&msg);
   free(msg.msg);
   yield();
-  vga_write_string("Getting message\n");
+  vga_write_string("Getting fs_box message\n");
   msg.msg=malloc(sizeof(vfs_message));
-  mailbox_get_msg(box,&msg,sizeof(vfs_message));
-  vfs_message* vfs_msg=(vfs_message*)msg.msg;
-  display_msg(vfs_msg);
-  vga_write_string("Sending second test message\n");
-  msg_data=make_msg(VFS_OPEN,"r","/dev/sdb");
-  msg.from=box;
-  msg.to=1;
-  msg.msg=msg_data;
-  msg.size=sizeof(vfs_message);
-  mailbox_send_msg(&msg);
+  mailbox_get_msg(fs_box,&msg,sizeof(vfs_message));
+  if (msg.from==0) {
+    vga_write_string("No message\n");
+  } else {
+    vfs_message* vfs_msg=(vfs_message*)msg.msg;
+    display_msg(vfs_msg);
+    msg.to=msg.from;
+    msg.from=fs_box;
+    vfs_msg->flags=13;
+    mailbox_send_msg(&msg);
+  }
   free(msg.msg);
   yield();
   vga_write_string("Getting message\n");
   msg.msg=malloc(sizeof(vfs_message));
   mailbox_get_msg(box,&msg,sizeof(vfs_message));
-  vfs_msg=(vfs_message*)msg.msg;
-  display_msg(vfs_msg);
-  for(;;);
+  if (msg.from==0) {
+    vga_write_string("No message\n");
+  } else {
+    vfs_message* vfs_msg=(vfs_message*)msg.msg;
+    display_msg(vfs_msg);
+  }
+  free(msg.msg);
+}
+
+int main(char* initrd, uint32_t initrd_sz) {
+  text_fb_info info;
+  info.address=map_phys((void*)0xB8000,10);
+  info.width=80;
+  info.height=25;
+  vga_init(info);
+  // uint32_t datapos=find_loc("vfs",initrd);
+  // load_task(datapos,initrd);
+  // uint32_t box=mailbox_new(16);
+  // yield();
+  // // uint32_t fs_box=mailbox_new(16);
+  // // test_vfs("/dev/sda",box,fs_box);
+  // // test_vfs("/dev/sdb",box,fs_box);
+  for(;;) {
+    yield();
+  }
 }

init/vga.c

@@ -11,6 +11,8 @@ static int x;
 static int y;
 static vga_colors fg_color;
 static vga_colors bg_color;
+static char* scroll_buf[0xfa0];
+
 
 static void set_char(int x,int y,char c) {
   screen[xy_to_indx(x,y)]=c;
@@ -55,6 +57,9 @@ void vga_write_string(const char* string) {
     if (c=='\n') {
       x=0;
       y++;
+      for (int i=0;i<67108864;i++) {
+        1+1;
+      }
     } else {
       set_char(x,y,c);
       x++;
@@ -65,11 +70,10 @@ void vga_write_string(const char* string) {
     }
     if (y==height) {
       x=0;
-      y=0;
-      // char* pg1=(char*)((uint32_t)screen+0xfa0);
-      // memcpy(pg1,&screen[xy_to_indx(0,1)],xy_to_indx(0,24));
-      // vga_clear();
-      // memcpy(&screen,pg1,xy_to_indx(0,25));
+      y=24;
+      memcpy(scroll_buf,&screen[xy_to_indx(0,1)],xy_to_indx(0,24));
+      vga_clear();
+      memcpy(screen,scroll_buf,xy_to_indx(0,25));
     }
   }
   set_cursor(x,y);

kernel/start.asm

@@ -1,6 +1,8 @@
 extern main
+extern __stdio_init
 global _start
 
 _start:
+  call __stdio_init
   call main
   ret

libc/stdio.c

@@ -0,0 +1,56 @@
+#include <mailboxes.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ipc/vfs.h>
+#include <stdio.h>
+#include <tasking.h>
+#define VFS_PID 1
+
+
+static uint32_t box;
+
+void __stdio_init() {
+  box=mailbox_new(16);
+}
+
+static vfs_message* make_msg(vfs_message_type type, char* mode, char* path) {
+  static uint32_t id=0;
+  vfs_message* msg_data=malloc(sizeof(vfs_message));
+  msg_data->type=type;
+  msg_data->id=id;
+  id++;
+  strcpy(&msg_data->mode[0],mode);
+  strcpy(&msg_data->path[0],path);
+  return msg_data;
+}
+
+FILE* fopen(char* filename,char* mode) {
+  if (strlen(filename)>4096 || strlen(mode)>10) {
+    return NULL;
+  }
+  vfs_message* msg_data=make_msg(VFS_OPEN,mode,filename);
+  Message msg;
+  msg.from=box;
+  msg.to=VFS_PID;
+  msg.msg=msg_data;
+  msg.size=sizeof(vfs_message);
+  mailbox_send_msg(&msg);
+  free(msg.msg);
+  yield();
+  msg.msg=malloc(sizeof(vfs_message));
+  mailbox_get_msg(box,&msg,sizeof(vfs_message));
+  while (msg.from==0) {
+    yield();
+    mailbox_get_msg(box,&msg,sizeof(vfs_message));
+  }
+  vfs_message* vfs_msg=(vfs_message*)msg.msg;
+  if (vfs_msg->flags) {
+    free(msg.msg);
+    return NULL;
+  } else {
+    FILE* file=malloc(sizeof(FILE));
+    *file=vfs_msg->fd; //We're using pointers to FILE even though it's a uint32_t so we can expand to a struct if needed
+    free(msg.msg);
+    return file;
+  }
+}

sysroot/usr/include/stdio.h

@@ -5,8 +5,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#define FILE uint32_t
-
+#define FILE uint32_t //We're using pointers to FILE even though it's a uint32_t so we can expand to a struct if needed
 #define SEEK_CUR 1
 #define SEEK_END 2
 #define SEEK_SET 3
@@ -17,7 +16,7 @@
 #define stderr 2
 
 
-FILE* fopen(const char* filename,const char* mode);
+FILE* fopen(char* filename,char* mode);
 int fgetc(FILE* stream);
 int getc();
 char* fgets(char* str,int count,FILE* stream);

vfs/main.c

@@ -30,6 +30,10 @@ uint16_t open_fds[32768];
 vfs_message* get_message(Message* msg,uint32_t box) {
   msg->msg=malloc(sizeof(vfs_message));
   mailbox_get_msg(box,msg,sizeof(vfs_message));
+  while (msg->from==0 && msg->size==0) {
+    mailbox_get_msg(box,msg,sizeof(vfs_message));
+    yield();
+  }
   vfs_message* vfs_msg=(vfs_message*)msg->msg;
   msg->to=msg->from;
   msg->from=box;
@@ -47,10 +51,14 @@ static int vfsstrcmp(const char* s1,const char* s2) {
 
 void init_vfs() {
   drvs=malloc(sizeof(uint32_t)*32);
+  drvs[0]=2;
   drv_names=malloc(sizeof(const char**)*32);
   max_drvs=32;
   next_drv_indx=0;
-  head_mapping=NULL;
+  head_mapping=malloc(sizeof(vfs_mapping));
+  head_mapping->mntpnt="/dev/";
+  head_mapping->type=0;
+  head_mapping->next=NULL;
   tail_mapping=NULL;
 }
 
@@ -66,19 +74,53 @@ uint32_t register_fs(uint32_t drv,const char* type) {
   return next_drv_indx-1;
 }
 
-char fopen(vfs_message* vfs_msg,uint32_t from) {
-  if (fd_tables[from]==NULL) {
-    fd_tables[from]=malloc(PROC_FD_LIMIT*sizeof(vfs_file));
-    open_fds[from]=0;
-  } else {
-    if (open_fds[from]==PROC_FD_LIMIT) {
-      return 4;
+char vfs_fopen(vfs_message* vfs_msg,uint32_t from) {
+  vfs_mapping* mnt=head_mapping;
+  vfs_mapping* mntpnt=NULL;
+  const char* path;
+  uint32_t mntpnt_len=0;
+  for (;mnt!=NULL;mnt=mnt->next) {
+    char* root=mnt->mntpnt;
+    if (strlen(root)>mntpnt_len) {
+      if (vfsstrcmp(root,vfs_msg->path)==0) {
+        mntpnt=mnt;
+        mntpnt_len=strlen(root);
+      }
     }
   }
-  uint16_t fd=open_fds[from];
-  open_fds[from]++;
-  vfs_msg->fd=fd;
-  return 0;
+  if (mntpnt) {
+    Message msg;
+    char* path_buf=malloc(sizeof(char)*4096);
+    strcpy(path_buf,&(vfs_msg->path[0]));
+    memset(&(vfs_msg->path[0]),0,sizeof(char)*4096);
+    for (int i=0;i<strlen(path_buf)+1-mntpnt_len;i++) {
+      vfs_msg->path[i]=path_buf[i+mntpnt_len];
+    }
+    free(path_buf);
+    msg.from=1;
+    msg.to=drvs[mntpnt->type];
+    msg.size=sizeof(vfs_message);
+    msg.msg=vfs_msg;
+    mailbox_send_msg(&msg);
+    yield();
+    vfs_message* vfs_msg=get_message(&msg,1);
+    if (vfs_msg->flags!=0) {
+      return vfs_msg->flags;
+    }
+    if (fd_tables[from]==NULL) {
+      fd_tables[from]=malloc(PROC_FD_LIMIT*sizeof(vfs_file));
+      open_fds[from]=1;
+    } else {
+      if (open_fds[from]==PROC_FD_LIMIT) {
+        return 4;
+      }
+    }
+    uint16_t fd=open_fds[from];
+    open_fds[from]++;
+    vfs_msg->fd=fd;
+    return 0;
+  }
+  return 1;
 }
 
 int main() {
@@ -90,7 +132,7 @@ int main() {
     vfs_message* vfs_msg=get_message(&msg,box);
     switch (vfs_msg->type) {
       case VFS_OPEN:
-      vfs_msg->flags=fopen(vfs_msg,msg.from);
+      vfs_msg->flags=vfs_fopen(vfs_msg,msg.from);
       break;
       case VFS_PUTC:
       vfs_msg->flags=1;