LibC: Change a couple of ASSERT_NOT_REACHED() to TODO()

Just for semantic correctness and better visibility of those
unimplemented stub functions.

Userland/Libraries/LibC/dlfcn.cpp

@@ -67,7 +67,7 @@ void* dlopen(const char* filename, int flags)
         // FIXME: Return the handle for "the main executable"
         //     The Serenity Kernel will keep a mapping of the main elf binary resident in memory,
         //     But a future dynamic loader might have a different idea/way of letting us access this information
-        ASSERT_NOT_REACHED();
+        TODO();
     }
 
     auto basename = LexicalPath(filename).basename();

Userland/Libraries/LibC/mntent.cpp

@@ -24,6 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <AK/Format.h>
 #include <assert.h>
 #include <mntent.h>
 
@@ -31,7 +32,8 @@ extern "C" {
 
 struct mntent* getmntent(FILE*)
 {
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement getmntent()");
+    TODO();
     return nullptr;
 }
 }

Userland/Libraries/LibC/signal.cpp

@@ -24,12 +24,12 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <AK/Format.h>
 #include <Kernel/API/Syscall.h>
 #include <assert.h>
 #include <errno.h>
 #include <setjmp.h>
 #include <signal.h>
-#include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -184,8 +184,8 @@ void siglongjmp(jmp_buf env, int val)
 
 int sigsuspend(const sigset_t*)
 {
-    dbgprintf("FIXME: Implement sigsuspend()\n");
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement sigsuspend()");
+    TODO();
 }
 
 static const char* signal_names[] = {

Userland/Libraries/LibC/stdio.cpp

@@ -25,7 +25,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <AK/LogStream.h>
+#include <AK/Format.h>
 #include <AK/PrintfImplementation.h>
 #include <AK/ScopedValueRollback.h>
 #include <AK/StdLibExtras.h>
@@ -1071,7 +1071,8 @@ int dbgputstr(const char* characters, ssize_t length)
 
 char* tmpnam(char*)
 {
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement tmpnam()");
+    TODO();
 }
 
 FILE* popen(const char* command, const char* type)

Userland/Libraries/LibC/stdlib.cpp

@@ -801,7 +801,8 @@ ldiv_t ldiv(long numerator, long denominator)
 
 size_t mbstowcs(wchar_t*, const char*, size_t)
 {
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement mbstowcs()");
+    TODO();
 }
 
 int mbtowc(wchar_t* wch, const char* data, [[maybe_unused]] size_t data_size)
@@ -821,7 +822,8 @@ int mbtowc(wchar_t* wch, const char* data, [[maybe_unused]] size_t data_size)
 
 int wctomb(char*, wchar_t)
 {
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement wctomb()");
+    TODO();
 }
 
 size_t wcstombs(char* dest, const wchar_t* src, size_t max)

Userland/Libraries/LibC/time.cpp

@@ -366,7 +366,8 @@ int nanosleep(const struct timespec* requested_sleep, struct timespec* remaining
 
 int clock_getres(clockid_t, struct timespec*)
 {
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement clock_getres()");
+    TODO();
 }
 
 double difftime(time_t t1, time_t t0)

Userland/Libraries/LibC/ulimit.cpp

@@ -24,7 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <AK/LogStream.h>
+#include <AK/Format.h>
 #include <assert.h>
 #include <sys/resource.h>
 #include <ulimit.h>
@@ -33,13 +33,14 @@ extern "C" {
 
 long ulimit([[maybe_unused]] int cmd, [[maybe_unused]] long newlimit)
 {
-    ASSERT_NOT_REACHED();
+    dbgln("FIXME: Implement getrusage()");
+    TODO();
     return -1;
 }
 
 int getrusage([[maybe_unused]] int who, [[maybe_unused]] struct rusage* usage)
 {
-    dbgln("LibC: getrusage is not implemented");
+    dbgln("FIXME: Implement getrusage()");
     return -1;
 }
 }

Userland/Libraries/LibC/unistd.cpp

@@ -771,7 +771,7 @@ ssize_t pread(int fd, void* buf, size_t count, off_t offset)
 char* getpass(const char* prompt)
 {
     dbgln("FIXME: getpass('{}')", prompt);
-    ASSERT_NOT_REACHED();
+    TODO();
 }
 
 long sysconf(int name)