mirror of
https://github.com/ByteWelder/Tactility.git
synced 2026-10-17 02:45:05 +00:00
cba73d1de2
New features: - SDK version 7.0.0 packages include version metadata and platform-specific application settings. - Apps gain POSIX support for file polling, terminal attributes, and standard input/output, plus additional C and POSIX functions. - Shell commands can launch installed headless apps using their registered app settings. - Apps can exit with a status code, and terminal clear commands support clearing from the cursor to the end, from the start through the cursor, or the entire display. Fixes: - SDK integration builds locate the build tool reliably and use settings for the selected platform. - ESP32 file operations handle invalid paths and existing directories more consistently.
121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
#ifdef ESP_PLATFORM
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// There is no real filesystem at "/" on ESP32 and esp_vfs_register() rejects "/" as a mount prefix.
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// Every real mount lives at "/data", "/sdcard", etc.), so opendir("/")/readdir()/ closedir() are wrapped
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// synthesize a listing of registered filesystems
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//
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// DIR's own layout (components/vfs's sys/dirent.h) is deliberately minimal:
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// Just a `dd_vfs_idx` (which registered VFS owns this handle) and a reserved `dd_rsv`,
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// with "remaining fields defined by VFS implementation".
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// So a real DIR* and this file's own RootDir agree on the first 4 bytes regardless of who allocated it.
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// `dd_vfs_idx` is never a real VFS's table offset here and `dd_rsv` is left untouched (0) by every real VFS implementation,
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// so tagging it with a nonzero magic value reliably tells our handles apart from real ones.
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#include <tactility/filesystem/file_system.h>
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#include <dirent.h>
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#include <cerrno>
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#include <cstdint>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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namespace {
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constexpr uint16_t ROOT_DIR_VFS_IDX = 0xFFFF;
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constexpr uint16_t ROOT_DIR_MAGIC = 0x5A11;
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constexpr int ROOT_DIR_MAX_ENTRIES = 16;
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struct RootDir {
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uint16_t dd_vfs_idx;
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uint16_t dd_rsv;
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int count;
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int position;
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char names[ROOT_DIR_MAX_ENTRIES][64];
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struct dirent entry;
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};
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bool isRootDir(DIR* pdir) {
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auto* dir = reinterpret_cast<RootDir*>(pdir);
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return dir->dd_vfs_idx == ROOT_DIR_VFS_IDX && dir->dd_rsv == ROOT_DIR_MAGIC;
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}
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// Copies the mount path's top-level segment rather than using file_system_get_name(): the
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// registered name isn't always the mount point, and isn't guaranteed to be a string literal
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// that outlives this snapshot.
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bool collectMountName(FileSystem* fs, void* context) {
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auto* dir = static_cast<RootDir*>(context);
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if (dir->count >= ROOT_DIR_MAX_ENTRIES) {
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return false;
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}
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char path[64];
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if (file_system_get_path(fs, path, sizeof(path)) != ERROR_NONE) {
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return true;
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}
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const char* top = (path[0] == '/') ? path + 1 : path;
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if (top[0] == '\0' || strchr(top, '/') != nullptr) {
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return true; // not a top-level mount point
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}
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snprintf(dir->names[dir->count], sizeof(dir->names[0]), "%s", top);
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dir->count++;
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return true;
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}
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} // namespace
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extern "C" DIR* __real_opendir(const char* name);
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extern "C" struct dirent* __real_readdir(DIR* pdir);
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extern "C" int __real_closedir(DIR* pdir);
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extern "C" {
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DIR* __wrap_opendir(const char* name) {
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// The VFS dereferences a NULL path (see vfs_null_path.cpp)
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if (name == nullptr) {
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errno = EFAULT;
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return nullptr;
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}
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if (strcmp(name, "/") != 0) {
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return __real_opendir(name);
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}
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auto* dir = static_cast<RootDir*>(calloc(1, sizeof(RootDir)));
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if (dir == nullptr) {
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return nullptr; // matches opendir()'s own ENOMEM contract; errno is left to the caller
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}
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dir->dd_vfs_idx = ROOT_DIR_VFS_IDX;
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dir->dd_rsv = ROOT_DIR_MAGIC;
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file_system_for_each_mounted(dir, collectMountName);
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return reinterpret_cast<DIR*>(dir);
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}
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struct dirent* __wrap_readdir(DIR* pdir) {
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if (pdir == nullptr || !isRootDir(pdir)) {
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return __real_readdir(pdir);
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}
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auto* dir = reinterpret_cast<RootDir*>(pdir);
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if (dir->position >= dir->count) {
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return nullptr; // end of directory; errno intentionally left unchanged
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}
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dir->entry.d_ino = 0;
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dir->entry.d_type = DT_DIR;
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snprintf(dir->entry.d_name, sizeof(dir->entry.d_name), "%s", dir->names[dir->position]);
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dir->position++;
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return &dir->entry;
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}
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int __wrap_closedir(DIR* pdir) {
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if (pdir == nullptr || !isRootDir(pdir)) {
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return __real_closedir(pdir);
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}
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free(pdir);
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return 0;
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}
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}
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#endif // ESP_PLATFORM
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