From 9f3fdb830f61cd8c8c1f1db9d03cba1c546c1a7e Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sun, 24 Jul 2022 15:07:57 +0200
Subject: user: change the directory structure to prepare for multiple binaries

---
 src/user/driver/tmpfs.c | 132 ------------------------------------------------
 1 file changed, 132 deletions(-)
 delete mode 100644 src/user/driver/tmpfs.c

(limited to 'src/user/driver/tmpfs.c')

diff --git a/src/user/driver/tmpfs.c b/src/user/driver/tmpfs.c
deleted file mode 100644
index 6e5b45e..0000000
--- a/src/user/driver/tmpfs.c
+++ /dev/null
@@ -1,132 +0,0 @@
-#include <user/lib/malloc.h>
-#include <shared/mem.h>
-#include <shared/syscalls.h>
-#include <stddef.h>
-
-struct node {
-	const char *name;
-	size_t namelen;
-	struct node *next;
-	char *buf;
-	size_t size, capacity;
-};
-
-struct node *root = NULL;
-static struct node special_root;
-
-static struct node *lookup(const char *path, size_t len) {
-	for (struct node *iter = root; iter; iter = iter->next) {
-		if (iter->namelen == len && !memcmp(path, iter->name, len))
-			return iter;
-	}
-	return NULL;
-}
-
-static struct node *tmpfs_open(const char *path, struct fs_wait_response *res) {
-	struct node *node;
-	if (res->len == 0) return NULL;
-	path++;
-	res->len--;
-
-	if (res->len == 0) return &special_root;
-
-	// no directory support (yet)
-	if (memchr(path, '/', res->len)) return NULL;
-
-	node = lookup(path, res->len);
-	if (!node && (res->flags & OPEN_CREATE)) {
-		node = malloc(sizeof *node);
-		memset(node, 0, sizeof *node);
-
-		char *namebuf = malloc(res->len);
-		memcpy(namebuf, path, res->len);
-		node->name = namebuf;
-		node->namelen = res->len;
-		node->next = root;
-		root = node;
-	}
-	return node;
-}
-
-void tmpfs_drv(void) {
-	// TODO replace all the static allocations in drivers with mallocs
-	static char buf[512];
-	struct fs_wait_response res;
-	struct node *ptr;
-	while (!_syscall_fs_wait(buf, sizeof buf, &res)) {
-		switch (res.op) {
-			case VFSOP_OPEN:
-				ptr = tmpfs_open(buf, &res);
-				_syscall_fs_respond(ptr, ptr ? 0 : -1, 0);
-				break;
-
-			case VFSOP_READ:
-				ptr = (void*)res.id;
-				if (ptr == &special_root) {
-					size_t buf_pos = 0;
-					size_t to_skip = res.offset;
-
-					for (struct node *iter = root; iter; iter = iter->next) {
-						if (iter->namelen <= to_skip) {
-							to_skip -= iter->namelen;
-							continue;
-						}
-
-						if (iter->namelen + buf_pos - to_skip >= sizeof(buf)) {
-							memcpy(buf + buf_pos, iter->name + to_skip, sizeof(buf) - buf_pos - to_skip);
-							buf_pos = sizeof(buf);
-							break;
-						}
-						memcpy(buf + buf_pos, iter->name + to_skip, iter->namelen - to_skip);
-						buf_pos += iter->namelen - to_skip;
-						buf[buf_pos++] = '\0';
-						to_skip = 0;
-					}
-					_syscall_fs_respond(buf, buf_pos, 0);
-				} else {
-					// TODO offset
-					if (res.offset)
-						_syscall_fs_respond(NULL, 0, 0);
-					else
-						_syscall_fs_respond(ptr->buf, ptr->size, 0);
-					break;
-				}
-				break;
-
-			case VFSOP_WRITE:
-				ptr = (void*)res.id;
-				if (ptr == &special_root) {
-					_syscall_fs_respond(NULL, -1, 0);
-					break;
-				}
-				if (res.len == 0) {
-					_syscall_fs_respond(NULL, 0, 0);
-					break;
-				}
-				if (!ptr->buf) {
-					ptr->buf = malloc(256);
-					if (!ptr->buf) {
-						_syscall_fs_respond(NULL, -1, 0);
-						break;
-					}
-					memset(ptr->buf, 0, 256);
-					ptr->capacity = 256;
-				}
-
-				size_t len = res.len;
-				if (len > ptr->capacity - res.offset)
-					len = ptr->capacity - res.offset;
-				memcpy(ptr->buf + res.offset, buf, len);
-				if (ptr->size < res.offset + len)
-					ptr->size = res.offset + len;
-				_syscall_fs_respond(NULL, len, 0);
-				break;
-
-			default:
-				_syscall_fs_respond(NULL, -1, 0);
-				break;
-		}
-	}
-
-	_syscall_exit(1);
-}
-- 
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