Platform: add current working directory (cwd) to FFPlatform structure and initialization

src/common/FFPlatform.h

@@ -19,6 +19,7 @@ typedef struct FFPlatform
     FFlist configDirs; // List of FFstrbuf, trailing slash included
     FFlist dataDirs;   // List of FFstrbuf, trailing slash included
     FFstrbuf exePath;  // The real path of current exe (empty if unavailable)
+    FFstrbuf cwd;      // Trailing slash included
 
     uint32_t pid;
     #ifndef _WIN32

src/common/impl/FFPlatform.c

@@ -10,6 +10,7 @@ void ffPlatformInit(FFPlatform* platform)
     ffListInit(&platform->configDirs, sizeof(FFstrbuf));
     ffListInit(&platform->dataDirs, sizeof(FFstrbuf));
     ffStrbufInit(&platform->exePath);
+    ffStrbufInit(&platform->cwd);
 
     ffStrbufInit(&platform->userName);
     ffStrbufInit(&platform->fullUserName);
@@ -49,6 +50,7 @@ void ffPlatformDestroy(FFPlatform* platform)
         ffStrbufDestroy(dir);
     ffListDestroy(&platform->dataDirs);
     ffStrbufDestroy(&platform->exePath);
+    ffStrbufDestroy(&platform->cwd);
 
     ffStrbufDestroy(&platform->userName);
     ffStrbufDestroy(&platform->hostName);

src/common/impl/FFPlatform_unix.c

@@ -224,6 +224,16 @@ static void getSysinfo(FFPlatformSysinfo* info, const struct utsname* uts)
     #endif
 }
 
+static void getCwd(FFPlatform* platform)
+{
+    char cwd[PATH_MAX];
+    if (getcwd(cwd, sizeof(cwd)) != NULL)
+    {
+        ffStrbufSetS(&platform->cwd, cwd);
+        ffStrbufEnsureEndsWithC(&platform->cwd, '/');
+    }
+}
+
 void ffPlatformInitImpl(FFPlatform* platform)
 {
     platform->pid = (uint32_t) getpid();
@@ -235,6 +245,7 @@ void ffPlatformInitImpl(FFPlatform* platform)
         memset(&uts, 0, sizeof(uts));
 
     getExePath(platform);
+    getCwd(platform);
     getHomeDir(platform, pwd);
     getCacheDir(platform);
     getConfigDirs(platform);

src/common/impl/FFPlatform_windows.c

@@ -313,10 +313,22 @@ static void getSystemArchitecture(FFPlatformSysinfo* info)
     }
 }
 
+static void getCwd(FFPlatform* platform)
+{
+    static_assert(
+        offsetof(RTL_USER_PROCESS_PARAMETERS, Reserved2[5]) == 0x38,
+        "CurrentDirectory should be at offset 0x38 in RTL_USER_PROCESS_PARAMETERS. Structure layout mismatch detected.");
+    PCURDIR cwd = (PCURDIR) &NtCurrentTeb()->ProcessEnvironmentBlock->ProcessParameters->Reserved2[5];
+    ffStrbufSetNWS(&platform->cwd, cwd->DosPath.Length / sizeof(WCHAR), cwd->DosPath.Buffer);
+    ffStrbufReplaceAllC(&platform->cwd, '\\', '/');
+    ffStrbufEnsureEndsWithC(&platform->cwd, '/');
+}
+
 void ffPlatformInitImpl(FFPlatform* platform)
 {
     platform->pid = (uint32_t) GetCurrentProcessId();
     getExePath(platform);
+    getCwd(platform);
     getHomeDir(platform);
     getCacheDir(platform);
     getConfigDirs(platform);

src/common/windows/nt.h

@@ -270,3 +270,9 @@ typedef struct _PROCESS_DEVICEMAP_INFORMATION_EX
 #ifndef NtCurrentProcess
 #define NtCurrentProcess() ((HANDLE)(LONG_PTR)-1)
 #endif
+
+typedef struct _CURDIR
+{
+    UNICODE_STRING DosPath;
+    HANDLE Handle;
+} CURDIR, *PCURDIR;

src/modules/title/title.c

@@ -70,6 +70,7 @@ bool ffPrintTitle(FFTitleOptions* options)
             FF_FORMAT_ARG(instance.state.platform.sid, "user-id"),
             #endif
             FF_FORMAT_ARG(instance.state.platform.pid, "pid"),
+            FF_FORMAT_ARG(instance.state.platform.cwd, "cwd"),
         }));
     }
 
@@ -139,6 +140,7 @@ bool ffGenerateTitleJsonResult(FF_MAYBE_UNUSED FFTitleOptions* options, yyjson_m
     yyjson_mut_obj_add_strbuf(doc, obj, "exePath", &instance.state.platform.exePath);
     yyjson_mut_obj_add_strbuf(doc, obj, "userShell", &instance.state.platform.userShell);
     yyjson_mut_obj_add_uint(doc, obj, "pid", instance.state.platform.pid);
+    yyjson_mut_obj_add_strbuf(doc, obj, "cwd", &instance.state.platform.cwd);
 
     return true;
 }
@@ -183,5 +185,6 @@ FFModuleBaseInfo ffTitleModuleInfo = {
         {"Full user name", "full-user-name"},
         {"UID (*nix) / SID (Windows)", "user-id"},
         {"PID of current process", "pid"},
+        {"Current working directory", "cwd"},
     }))
 };