Remove some redundant error propagation

Why can printing to the serial port or format onto a string fail?
Even if cstyle_format returns Result<usize>, we shouldn't always follow suit.

kernel/src/Log.cpp

@@ -32,7 +32,8 @@ static void log_serial(LogLevel level, const char* format, va_list origin)
             Serial::putchar((u8)c);
             return {};
         },
-        nullptr, ap);
+        nullptr, ap)
+        .expect_value("Sanity check failed in log_serial: Should never fail");
 
     Serial::putchar('\n');
 
@@ -61,7 +62,8 @@ static void log_text_console(LogLevel level, const char* format, va_list origin)
             TextConsole::putchar(c);
             return {};
         },
-        nullptr, ap);
+        nullptr, ap)
+        .expect_value("Sanity check failed in log_text_console: Should never fail");
 
     TextConsole::putchar('\n');
 
@@ -72,26 +74,22 @@ static void log_text_console(LogLevel level, const char* format, va_list origin)
     va_end(ap);
 }
 
-Result<void> vlog(LogLevel level, const char* format, va_list ap)
+void vlog(LogLevel level, const char* format, va_list ap)
 {
-    if (!g_debug_enabled && level == LogLevel::Debug) return {};
+    if (!g_debug_enabled && level == LogLevel::Debug) return;
 
     if (g_serial_enabled) log_serial(level, format, ap);
     if (g_text_console_enabled) log_text_console(level, format, ap);
-
-    return {};
 }
 
-Result<void> log(LogLevel level, const char* format, ...)
+void log(LogLevel level, const char* format, ...)
 {
     va_list ap;
     va_start(ap, format);
 
-    TRY(vlog(level, format, ap));
+    vlog(level, format, ap);
 
     va_end(ap);
-
-    return {};
 }
 
 void setup_log(bool enable_debug, bool enable_serial, bool enable_text_console)

kernel/src/Log.h

@@ -11,8 +11,8 @@ enum class LogLevel
     Error,
 };
 
-Result<void> vlog(LogLevel level, const char* format, va_list ap);
-Result<void> log(LogLevel level, const char* format, ...) _format(2, 3);
+void vlog(LogLevel level, const char* format, va_list ap);
+void log(LogLevel level, const char* format, ...) _format(2, 3);
 
 void setup_log(bool enable_debug, bool enable_serial, bool enable_text_console);
 bool log_debug_enabled();
@@ -22,9 +22,4 @@ bool log_text_console_enabled();
 #define kdbgln(...) log(LogLevel::Debug, __VA_ARGS__)
 #define kinfoln(...) log(LogLevel::Info, __VA_ARGS__)
 #define kwarnln(...) log(LogLevel::Warn, __VA_ARGS__)
-#define kerrorln(...) log(LogLevel::Error, __VA_ARGS__)
-
-#define try_kdbgln(...) TRY(log(LogLevel::Debug, __VA_ARGS__))
-#define try_kinfoln(...) TRY(log(LogLevel::Info, __VA_ARGS__))
-#define try_kwarnln(...) TRY(log(LogLevel::Warn, __VA_ARGS__))
-#define try_kerrorln(...) TRY(log(LogLevel::Error, __VA_ARGS__))
+#define kerrorln(...) log(LogLevel::Error, __VA_ARGS__)

kernel/src/arch/Serial.cpp

@@ -21,17 +21,18 @@ namespace Serial
         putchar('\n');
     }
 
-    Result<usize> printf(const char* format, ...)
+    usize printf(const char* format, ...)
     {
         va_list ap;
         va_start(ap, format);
         auto rc = cstyle_format(
-            format,
-            [](char c, void*) -> Result<void> {
-                putchar((u8)c);
-                return {};
-            },
-            nullptr, ap);
+                      format,
+                      [](char c, void*) -> Result<void> {
+                          putchar((u8)c);
+                          return {};
+                      },
+                      nullptr, ap)
+                      .expect_value("Sanity check failed in Serial::printf: Should never fail");
         va_end(ap);
         return rc;
     }

kernel/src/arch/Serial.h

@@ -10,5 +10,5 @@ namespace Serial
     void write(const char* str, usize size);
     void print(const char* str);
     void println(const char* str);
-    Result<usize> printf(const char* str, ...) _format(1, 2);
+    usize printf(const char* str, ...) _format(1, 2);
 }

kernel/src/video/TextConsole.cpp

@@ -157,17 +157,18 @@ namespace TextConsole
         putchar('\n');
     }
 
-    Result<usize> printf(const char* format, ...)
+    usize printf(const char* format, ...)
     {
         va_list ap;
         va_start(ap, format);
         auto rc = cstyle_format(
-            format,
-            [](char c, void*) -> Result<void> {
-                putchar(c);
-                return {};
-            },
-            nullptr, ap);
+                      format,
+                      [](char c, void*) -> Result<void> {
+                          putchar(c);
+                          return {};
+                      },
+                      nullptr, ap)
+                      .expect_value("Sanity check failed in TextConsole::printf: Should never fail");
         va_end(ap);
         return rc;
     }

kernel/src/video/TextConsole.h

@@ -14,5 +14,5 @@ namespace TextConsole
     void move_to(u32 x, u32 y);
     void print(const char* str);
     void println(const char* str);
-    Result<usize> printf(const char* format, ...) _format(1, 2);
+    usize printf(const char* format, ...) _format(1, 2);
 }

luna/include/luna/Format.h

@@ -6,5 +6,5 @@
 typedef Result<void> (*callback_t)(char, void*);
 
 Result<usize> cstyle_format(const char* format, callback_t callback, void* arg, va_list ap);
-Result<usize> vstring_format(char* buf, usize max, const char* format, va_list ap);
-Result<usize> string_format(char* buf, usize max, const char* format, ...);
+usize vstring_format(char* buf, usize max, const char* format, va_list ap);
+usize string_format(char* buf, usize max, const char* format, ...);

luna/include/luna/Result.h

@@ -105,7 +105,7 @@ template <typename T> class Result
     T expect_value(const char* reason)
     {
         expect(has_value(), reason);
-        return move(m_value.release_value());
+        return m_value.value();
     }
 
     T value_or(const T& other)

luna/include/luna/Units.h

@@ -2,5 +2,5 @@
 #include <luna/OwnedStringView.h>
 #include <luna/Result.h>
 
-Result<usize> to_dynamic_unit_cstr(usize value, char* buffer, usize max);
+usize to_dynamic_unit_cstr(usize value, char* buffer, usize max);
 Result<OwnedStringView> to_dynamic_unit(usize value);

luna/src/Format.cpp

@@ -478,33 +478,34 @@ struct StringFormatInfo
     usize remaining;
 };
 
-Result<usize> vstring_format(char* buf, usize max, const char* format, va_list ap)
+usize vstring_format(char* buf, usize max, const char* format, va_list ap)
 {
     StringFormatInfo info = {.buffer = buf, .remaining = max - 1};
 
-    usize result = TRY(cstyle_format(
-        format,
-        [](char c, void* arg) -> Result<void> {
-            StringFormatInfo* info_arg = (StringFormatInfo*)arg;
-            if (!info_arg->remaining) return {};
-            *(info_arg->buffer) = c;
-            info_arg->buffer++;
-            info_arg->remaining--;
-            return {};
-        },
-        &info, ap));
+    usize result = cstyle_format(
+                       format,
+                       [](char c, void* arg) -> Result<void> {
+                           StringFormatInfo* info_arg = (StringFormatInfo*)arg;
+                           if (!info_arg->remaining) return {};
+                           *(info_arg->buffer) = c;
+                           info_arg->buffer++;
+                           info_arg->remaining--;
+                           return {};
+                       },
+                       &info, ap)
+                       .expect_value("Sanity check failed in vstring_format: Should never fail");
 
     *(info.buffer) = 0;
 
     return result;
 }
 
-Result<usize> string_format(char* buf, usize max, const char* format, ...)
+usize string_format(char* buf, usize max, const char* format, ...)
 {
     va_list ap;
     va_start(ap, format);
 
-    usize result = TRY(vstring_format(buf, max, format, ap));
+    usize result = vstring_format(buf, max, format, ap);
 
     va_end(ap);
 

luna/src/Units.cpp

@@ -4,7 +4,7 @@
 #include <luna/ScopeGuard.h>
 #include <luna/Units.h>
 
-Result<usize> to_dynamic_unit_cstr(usize value, char* buffer, usize max)
+usize to_dynamic_unit_cstr(usize value, char* buffer, usize max)
 {
     if (value < 1024) { return string_format(buffer, max, "%u bytes", value); }
 
@@ -22,11 +22,7 @@ Result<OwnedStringView> to_dynamic_unit(usize value)
 {
     char* buf = TRY(make_array<char>(64));
 
-    auto guard = make_scope_guard([&] { destroy_array(buf); });
-
-    TRY(to_dynamic_unit_cstr(value, buf, 64));
-
-    guard.deactivate();
+    to_dynamic_unit_cstr(value, buf, 64);
 
     return OwnedStringView{buf};
 }