+++ /dev/null
-/*
- * AcessMicro VFS
- * - Open, Close and ChDir
- */
-#define DEBUG 0
-#include <common.h>
-#include "vfs.h"
-#include "vfs_int.h"
-#include "vfs_ext.h"
-
-// === CONSTANTS ===
-#define OPEN_MOUNT_ROOT 1
-#define MAX_KERNEL_FILES 128
-#define MAX_PATH_SLASHES 256
-
-// === IMPORTS ===
-extern tVFS_Node gVFS_MemRoot;
-extern tVFS_Mount *gRootMount;
-
-// === GLOBALS ===
-tVFS_Handle *gaUserHandles = (void*)MM_PPD_VFS;
-tVFS_Handle *gaKernelHandles = (void*)MM_KERNEL_VFS;
-
-// === CODE ===
-/**
- * \fn char *VFS_GetAbsPath(char *Path)
- * \brief Create an absolute path from a relative one
- */
-char *VFS_GetAbsPath(char *Path)
-{
- char *ret;
- int pathLen = strlen(Path);
- int read, write;
- int pos, slashNum=0, baseLen;
- Uint slashOffsets[MAX_PATH_SLASHES];
- char *cwd = CFGPTR(CFG_VFS_CWD);
- int cwdLen;
-
- ENTER("sPath", Path);
-
- // Memory File
- if(Path[0] == '$') {
- ret = malloc(strlen(Path)+1);
- if(!ret) {
- Warning("VFS_GetAbsPath - malloc() returned NULL");
- return NULL;
- }
- strcpy(ret, Path);
- LEAVE('p', ret);
- return ret;
- }
-
- // Check if the path is already absolute
- if(Path[0] == '/') {
- ret = malloc(pathLen + 1);
- if(!ret) {
- Warning("VFS_GetAbsPath - malloc() returned NULL");
- return NULL;
- }
- strcpy(ret, Path);
- baseLen = 1;
- } else {
- cwdLen = strlen(cwd);
- // Prepend the current directory
- ret = malloc(cwdLen+pathLen+2);
- strcpy(ret, cwd);
- ret[cwdLen] = '/';
- strcpy(&ret[cwdLen+1], Path);
-
- // Pre-fill the slash positions
- read = 1; slashNum = 0;
- while( (pos = strpos( &ret[read], '/' )) != -1 && slashNum < MAX_PATH_SLASHES )
- {
- read += pos+1;
- slashOffsets[slashNum++] = pos;
- }
-
- baseLen = cwdLen+1;
- }
-
- // Remove . and ..
- read = write = baseLen; // Cwd has already been parsed
- for(; read < baseLen+pathLen; read = pos+1)
- {
- pos = strpos( &ret[read], '/' );
- // If we are in the last section, force a break at the end of the itteration
- if(pos == -1) pos = baseLen+pathLen;
- else pos += read; // Else, Adjust to absolute
-
- // Check Length
- if(pos - read <= 2)
- {
- // Current Dir "."
- if(strncmp(&ret[read], ".", pos-read) == 0) continue;
- // Parent ".."
- if(strncmp(&ret[read], "..", pos-read) == 0)
- {
- // If there is no higher, silently ignore
- if(!slashNum) continue;
- // Reverse write pointer
- write = slashOffsets[ slashNum-- ];
- continue;
- }
- }
-
-
- // Only copy if the positions differ
- if(read != write) {
- memcpy( &ret[write], &ret[read], pos-read+1 );
- }
- write = pos+1;
- if(slashNum < MAX_PATH_SLASHES)
- slashOffsets[ slashNum++ ] = pos;
- else {
- LOG("Path '%s' has too many elements", Path);
- free(ret);
- LEAVE('n');
- return NULL;
- }
- }
-
- // `ret` should now be the absolute path
- LEAVE('s', ret);
- return ret;
-}
-
-/**
- * \fn char *VFS_ParsePath(char *Path, char **TruePath)
- * \brief Parses a path, resolving sysmlinks and applying permissions
- */
-tVFS_Node *VFS_ParsePath(char *Path, char **TruePath)
-{
- tVFS_Mount *mnt;
- tVFS_Mount *longestMount = gRootMount; // Root is first
- int cmp, retLength = 0;
- int ofs, nextSlash;
- tVFS_Node *curNode, *tmpNode;
- char *tmp;
-
- ENTER("sPath pTruePath", Path, TruePath);
-
- // Memory File
- if(Path[0] == '$') {
- if(TruePath) {
- *TruePath = malloc(strlen(Path)+1);
- strcpy(*TruePath, Path);
- }
- curNode = gVFS_MemRoot.FindDir(&gVFS_MemRoot, Path);
- LEAVE('p', curNode);
- return curNode;
- }
- // For root we always fast return
-
- if(Path[0] == '/' && Path[1] == '\0') {
- if(TruePath) {
- *TruePath = malloc( gRootMount->MountPointLen+1 );
- strcpy(*TruePath, gRootMount->MountPoint);
- }
- LEAVE('p', gRootMount->RootNode);
- return gRootMount->RootNode;
- }
-
- // Check if there is anything mounted
- if(!gMounts) return NULL;
-
- // Find Mountpoint
- for(mnt = gMounts;
- mnt;
- mnt = mnt->Next)
- {
- // Quick Check
- if( Path[mnt->MountPointLen] != '/' && Path[mnt->MountPointLen] != '\0')
- continue;
- // Length Check - If the length is smaller than the longest match sofar
- if(mnt->MountPointLen < longestMount->MountPointLen) continue;
- // String Compare
- cmp = strcmp(Path, mnt->MountPoint);
-
- #if OPEN_MOUNT_ROOT
- // Fast Break - Request Mount Root
- if(cmp == 0) {
- if(TruePath) {
- *TruePath = malloc( mnt->MountPointLen+1 );
- strcpy(*TruePath, mnt->MountPoint);
- }
- LEAVE('p', mnt->RootNode);
- return mnt->RootNode;
- }
- #endif
- // Not a match, continue
- if(cmp != '/') continue;
- longestMount = mnt;
- }
-
- // Sanity Check
- /*if(!longestMount) {
- Log("VFS_GetTruePath - ERROR: No Root Node\n");
- return NULL;
- }*/
-
- // Save to shorter variable
- mnt = longestMount;
-
- LOG("mnt = {MountPoint:\"%s\"}", mnt->MountPoint);
-
- // Initialise String
- if(TruePath)
- {
- *TruePath = malloc( mnt->MountPointLen+1 );
- strcpy(*TruePath, mnt->MountPoint);
- retLength = mnt->MountPointLen;
- }
-
- curNode = mnt->RootNode;
- curNode->ReferenceCount ++;
- // Parse Path
- ofs = mnt->MountPointLen+1;
- for(; (nextSlash = strpos(&Path[ofs], '/')) != -1; Path[nextSlash]='/',ofs = nextSlash + 1)
- {
- nextSlash += ofs;
- Path[nextSlash] = '\0';
-
- // Check for empty string
- if( Path[ofs] == '\0' ) continue;
-
- // Check permissions on root of filesystem
- if( !VFS_CheckACL(curNode, VFS_PERM_EXECUTE) ) {
- curNode->Close( curNode );
- if(TruePath) {
- free(*TruePath);
- *TruePath = NULL;
- }
- LEAVE('n');
- return NULL;
- }
-
- // Check if the node has a FindDir method
- if(!curNode->FindDir) {
- if(curNode->Close) curNode->Close(curNode);
- if(TruePath) {
- free(*TruePath);
- *TruePath = NULL;
- }
- Path[nextSlash] = '/';
- LEAVE('n');
- return NULL;
- }
- LOG("FindDir(%p, '%s')", curNode, &Path[ofs]);
- // Get Child Node
- tmpNode = curNode->FindDir(curNode, &Path[ofs]);
- LOG("tmpNode = %p", tmpNode);
- if(curNode->Close)
- curNode->Close(curNode);
- curNode = tmpNode;
-
- // Error Check
- if(!curNode) {
- LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
- if(TruePath) {
- free(*TruePath);
- *TruePath = NULL;
- }
- Path[nextSlash] = '/';
- LEAVE('n');
- return NULL;
- }
-
- // Handle Symbolic Links
- if(curNode->Flags & VFS_FFLAG_SYMLINK) {
- if(TruePath) {
- free(*TruePath);
- *TruePath = NULL;
- }
- tmp = malloc( curNode->Size + 1 );
- curNode->Read( curNode, 0, curNode->Size, tmp );
- tmp[ curNode->Size ] = '\0';
-
- // Parse Symlink Path
- curNode = VFS_ParsePath(tmp, TruePath);
-
- // Error Check
- if(!curNode) {
- free(tmp); // Free temp string
- LEAVE('n');
- return NULL;
- }
-
- // Set Path Variable
- if(TruePath) {
- *TruePath = tmp;
- retLength = strlen(tmp);
- } else {
- free(tmp); // Free temp string
- }
-
- continue;
- }
-
- // Handle Non-Directories
- if( !(curNode->Flags & VFS_FFLAG_DIRECTORY) )
- {
- Warning("VFS_ParsePath - File in directory context");
- if(TruePath) free(*TruePath);
- LEAVE('n');
- return NULL;
- }
-
- // Check if path needs extending
- if(!TruePath) continue;
-
- // Increase buffer space
- tmp = realloc( *TruePath, retLength + strlen(&Path[ofs]) + 1 + 1 );
- // Check if allocation succeeded
- if(!tmp) {
- Warning("VFS_ParsePath - Unable to reallocate true path buffer");
- free(*TruePath);
- if(curNode->Close) curNode->Close(curNode);
- LEAVE('n');
- return NULL;
- }
- *TruePath = tmp;
- // Append to path
- (*TruePath)[retLength] = '/';
- strcpy(*TruePath+retLength+1, &Path[ofs]);
- // - Extend Path
- retLength += strlen(&Path[ofs])+1;
- }
-
- // Get last node
- LOG("VFS_ParsePath: FindDir(%p, '%s')", curNode, &Path[ofs]);
- tmpNode = curNode->FindDir(curNode, &Path[ofs]);
- LOG("tmpNode = %p", tmpNode);
- if(curNode->Close) curNode->Close(curNode);
- // Check if file was found
- if(!tmpNode) {
- LOG("Node '%s' not found in dir '%s'", &Path[ofs], Path);
- if(TruePath) free(*TruePath);
- if(curNode->Close) curNode->Close(curNode);
- LEAVE('n');
- return NULL;
- }
-
- if(TruePath)
- {
- // Increase buffer space
- tmp = realloc(*TruePath, retLength + strlen(&Path[ofs]) + 1 + 1);
- // Check if allocation succeeded
- if(!tmp) {
- Warning("VFS_ParsePath - Unable to reallocate true path buffer");
- free(*TruePath);
- if(tmpNode->Close) tmpNode->Close(curNode);
- LEAVE('n');
- return NULL;
- }
- *TruePath = tmp;
- // Append to path
- (*TruePath)[retLength] = '/';
- strcpy(*TruePath + retLength + 1, &Path[ofs]);
- // - Extend Path
- //retLength += strlen(tmpNode->Name) + 1;
- }
-
- LEAVE('p', tmpNode);
- return tmpNode;
-}
-
-/**
- * \fn int VFS_Open(char *Path, Uint Mode)
- * \brief Open a file
- */
-int VFS_Open(char *Path, Uint Mode)
-{
- tVFS_Node *node;
- char *absPath;
- int i;
-
- ENTER("sPath xMode", Path, Mode);
-
- // Get absolute path
- absPath = VFS_GetAbsPath(Path);
- LOG("absPath = \"%s\"", absPath);
- // Parse path and get mount point
- node = VFS_ParsePath(absPath, NULL);
- // Free generated path
- free(absPath);
-
- if(!node) {
- LOG("Cannot find node");
- LEAVE('i', -1);
- return -1;
- }
-
- // Check for symlinks
- if( !(Mode & VFS_OPENFLAG_NOLINK) && (node->Flags & VFS_FFLAG_SYMLINK) )
- {
- if( !node->Read ) {
- Warning("No read method on symlink");
- LEAVE('i', -1);
- return -1;
- }
- absPath = malloc(node->Size+1); // Allocate Buffer
- node->Read( node, 0, node->Size, absPath ); // Read Path
-
- absPath[ node->Size ] = '\0'; // End String
- if(node->Close) node->Close( node ); // Close old node
- node = VFS_ParsePath(absPath, NULL); // Get new node
- free( absPath ); // Free allocated path
- }
-
- if(!node) {
- LEAVE('i', -1);
- return -1;
- }
-
- i = 0;
- i |= (Mode & VFS_OPENFLAG_EXEC) ? VFS_PERM_EXECUTE : 0;
- i |= (Mode & VFS_OPENFLAG_READ) ? VFS_PERM_READ : 0;
- i |= (Mode & VFS_OPENFLAG_WRITE) ? VFS_PERM_WRITE : 0;
-
- LOG("i = 0b%b", i);
-
- // Permissions Check
- if( !VFS_CheckACL(node, i) ) {
- node->Close( node );
- LEAVE('i', -1);
- return -1;
- }
-
- // Check for a user open
- if(Mode & VFS_OPENFLAG_USER)
- {
- // Allocate Buffer
- if( MM_GetPhysAddr( (Uint)gaUserHandles ) == 0 )
- {
- Uint addr, size;
- size = CFGINT(CFG_VFS_MAXFILES) * sizeof(tVFS_Handle);
- for(addr = 0; addr < size; addr += 0x1000)
- MM_Allocate( (Uint)gaUserHandles + addr );
- memset( gaUserHandles, 0, size );
- }
- // Get a handle
- for(i=0;i<CFGINT(CFG_VFS_MAXFILES);i++)
- {
- if(gaUserHandles[i].Node) continue;
- gaUserHandles[i].Node = node;
- gaUserHandles[i].Position = 0;
- gaUserHandles[i].Mode = Mode;
- LEAVE('i', i);
- return i;
- }
- }
- else
- {
- // Allocate space if not already
- if( MM_GetPhysAddr( (Uint)gaKernelHandles ) == 0 )
- {
- Uint addr, size;
- size = MAX_KERNEL_FILES * sizeof(tVFS_Handle);
- for(addr = 0; addr < size; addr += 0x1000)
- MM_Allocate( (Uint)gaKernelHandles + addr );
- memset( gaKernelHandles, 0, size );
- }
- // Get a handle
- for(i=0;i<MAX_KERNEL_FILES;i++)
- {
- if(gaKernelHandles[i].Node) continue;
- gaKernelHandles[i].Node = node;
- gaKernelHandles[i].Position = 0;
- gaKernelHandles[i].Mode = Mode;
- LEAVE('x', i|VFS_KERNEL_FLAG);
- return i|VFS_KERNEL_FLAG;
- }
- }
-
- LEAVE('i', -1);
- return -1;
-}
-
-/**
- * \fn void VFS_Close(int FD)
- * \brief Closes an open file handle
- */
-void VFS_Close(int FD)
-{
- tVFS_Handle *h;
-
- // Get handle
- h = VFS_GetHandle(FD);
- if(h == NULL) {
- Warning("Invalid file handle passed to VFS_Close, 0x%x\n", FD);
- return;
- }
-
- if(h->Node->Close)
- h->Node->Close( h->Node );
-
- h->Node = NULL;
-}
-
-/**
- * \fn int VFS_ChDir(char *New)
- * \brief Change current working directory
- */
-int VFS_ChDir(char *New)
-{
- char *buf;
- int fd;
- tVFS_Handle *h;
-
- // Create Absolute
- buf = VFS_GetAbsPath(New);
- if(buf == NULL) {
- Log("VFS_ChDir: Path expansion failed");
- return -1;
- }
-
- // Check if path exists
- fd = VFS_Open(buf, VFS_OPENFLAG_EXEC);
- if(fd == -1) {
- Log("VFS_ChDir: Path is invalid");
- return -1;
- }
-
- // Get node so we can check for directory
- h = VFS_GetHandle(fd);
- if( !(h->Node->Flags & VFS_FFLAG_DIRECTORY) ) {
- Log("VFS_ChDir: Path is not a directory");
- VFS_Close(fd);
- return -1;
- }
-
- // Close file
- VFS_Close(fd);
-
- // Free old working directory
- if( CFGPTR(CFG_VFS_CWD) ) free( CFGPTR(CFG_VFS_CWD) );
- // Set new
- CFGPTR(CFG_VFS_CWD) = buf;
-
- Log("Updated CWD to '%s'", buf);
-
- return 1;
-}
-
-/**
- * \fn tVFS_Handle *VFS_GetHandle(int FD)
- * \brief Gets a pointer to the handle information structure
- */
-tVFS_Handle *VFS_GetHandle(int FD)
-{
- tVFS_Handle *h;
-
- if(FD < 0) return NULL;
-
- if(FD & VFS_KERNEL_FLAG) {
- FD &= (VFS_KERNEL_FLAG - 1);
- if(FD >= MAX_KERNEL_FILES) return NULL;
- h = &gaKernelHandles[ FD ];
- } else {
- if(FD >= CFGINT(CFG_VFS_MAXFILES)) return NULL;
- h = &gaUserHandles[ FD ];
- }
-
- if(h->Node == NULL) return NULL;
- return h;
-}
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