GUI: U32: Fix problems with u32strings formatting

- Improve U32's format helper
- Add insertString helper to u32

backends/graphics/surfacesdl/surfacesdl-graphics.cpp

@@ -2464,9 +2464,8 @@ void SurfaceSdlGraphicsManager::handleScalerHotkeys(int scalefactor, int scalerT
 			g++;
 		}
 		if (newScalerName) {
-			const Common::U32String message = Common::String::format(
-				"%s %s\n%d x %d -> %d x %d",
-				_("Active graphics filter:").encode().c_str(),
+			const Common::U32String message = Common::U32String::format(
+				_("Active graphics filter: ") + Common::U32String("%s\n%d x %d -> %d x %d"),
 				newScalerName,
 				_videoMode.screenWidth, _videoMode.screenHeight,
 				_hwScreen->w, _hwScreen->h);

common/ustr.cpp

@@ -238,6 +238,12 @@ void U32String::insertChar(value_type c, uint32 p) {
 	_str[p] = c;
 }
 
+void U32String::insertString(String s, uint32 p) {
+	for (String::iterator i = s.begin(); i != s.end(); i++) {
+		U32String::insertChar(*i, p++);
+	}
+}
+
 void U32String::deleteChar(uint32 p) {
 	assert(p < _size);
 
@@ -520,68 +526,65 @@ void U32String::trim() {
 	}
 }
 
-// static
-U32String U32String::format(const char *fmt, ...) {
-	U32String output;
+U32String U32String::format(U32String fmt, ...) {
+	U32String output = fmt;
+	int len;
 
 	va_list va;
 	va_start(va, fmt);
-	output = U32String::vformat(fmt, va);
+	len = U32String::vformat(output, output.begin(), va);
 	va_end(va);
 
 	return output;
 }
 
-// static
-U32String U32String::vformat(const char *fmt, va_list args) {
-	U32String output = "";
-	assert(output.isStorageIntern());
-	output._str;
-	va_list va;
-	scumm_va_copy(va, args);
-	int len = vsnprintf((char *)output._str, _builtinCapacity, fmt, va);
-	va_end(va);
+int U32String::vformat(U32String &output, U32String::iterator fmt, va_list args) {
+	int int_temp;
+	char char_temp;
+	char *string_temp;
 
-	if (len == -1 || len == _builtinCapacity - 1) {
-		// MSVC and IRIX don't return the size the full string would take up.
-		// MSVC returns -1, IRIX returns the number of characters actually written,
-		// which is at the most the size of the buffer minus one, as the string is
-		// truncated to fit.
+	char ch;
+	int length = 0;
+	int len = 0;
+	int pos = 0;
 
-		// We assume MSVC failed to output the correct, null-terminated string
-		// if the return value is either -1 or size.
-		// For IRIX, because we lack a better mechanism, we assume failure
-		// if the return value equals size - 1.
-		// The downside to this is that whenever we try to format a string where the
-		// size is 1 below the built-in capacity, the size is needlessly increased.
+	char buffer[512];
 
-		// Try increasing the size of the string until it fits.
-		int size = _builtinCapacity;
-		do {
-			size *= 2;
-			output.ensureCapacity(size - 1, false);
-			assert(!output.isStorageIntern());
-			size = output._extern._capacity;
-
-			scumm_va_copy(va, args);
-			len = vsnprintf((char *)output._str, size, fmt, va);
-			va_end(va);
-		} while (len == -1 || len >= size - 1);
-		output._size = len;
-	} else if (len < (int)_builtinCapacity) {
-		// vsnprintf succeeded
-		output._size = len;
-	} else {
-		// vsnprintf didn't have enough space, so grow buffer
-		output.ensureCapacity(len, false);
-		scumm_va_copy(va, args);
-		int len2 = vsnprintf((char *)output._str, len + 1, fmt, va);
-		va_end(va);
-		assert(len == len2);
-		output._size = len2;
+	while (fmt != output.end() && pos < output.size()) {
+		ch = *fmt++;
+		if (ch == '%') {
+			switch (ch = *fmt++)
+			{
+			case 's':
+				string_temp = va_arg(args, char *);
+				len = strlen(string_temp);
+				length += len;
+				fmt -= 2;
+				output.deleteChar(pos); // remove %
+				output.deleteChar(pos); // remove s
+				output.insertString(string_temp, pos);
+				fmt += len;
+				pos += len;
+				break;
+			case 'd':
+				int_temp = va_arg(args, int);
+				fmt -= 2;
+				output.deleteChar(pos); // remove %
+				output.deleteChar(pos); // remove d
+				itoa(int_temp, buffer, 10);
+				output.insertString(buffer, pos);
+				len = strlen(buffer);
+				length += len;
+				fmt += len;
+				break;
+			default:
+				break;
+			}
+		}
+		pos++;
 	}
 
-	return output;
+	return length;
 }
 
 } // End of namespace Common

common/ustr.h

@@ -167,6 +167,7 @@ public:
 
 	/** Insert character c before position p. */
 	void insertChar(value_type c, uint32 p);
+	void insertString(String s, uint32 p);
 
 	/**
 	 * Removes the value at position p from the string.
@@ -240,14 +241,14 @@ public:
 	 * except that it stores the result in (variably sized) String
 	 * instead of a fixed size buffer.
 	 */
-	static U32String format(const char *fmt, ...) GCC_PRINTF(1, 2);
+	static U32String format(U32String fmt, ...) GCC_PRINTF(1, 2);
 
 	/**
 	 * Print formatted data into a String object. Similar to vsprintf,
 	 * except that it stores the result in (variably sized) String
 	 * instead of a fixed size buffer.
 	 */
-	static U32String vformat(const char *fmt, va_list args);
+	static int vformat(U32String &output, U32String::iterator fmt, va_list args);
 
 private:
 	void makeUnique();

gui/about.cpp

@@ -99,7 +99,7 @@ AboutDialog::AboutDialog()
 	version += gScummVMVersion;
 	_lines.push_back(version);
 
-	Common::U32String date = Common::String::format(_("(built on %s)").encode().c_str(), gScummVMBuildDate);
+	 Common::U32String date = Common::U32String::format(_("(built on %s)"), gScummVMBuildDate);
 	 _lines.push_back(U32String("C2") + date);
 
 	for (i = 0; i < ARRAYSIZE(copyright_text); i++)

gui/about.h

@@ -25,6 +25,7 @@
 
 #include "gui/dialog.h"
 #include "common/str.h"
+#include "common/ustr.h"
 #include "common/array.h"
 #include "common/keyboard.h"
 
@@ -33,6 +34,7 @@ namespace GUI {
 class EEHandler;
 
 class AboutDialog : public Dialog {
+	typedef Common::String String;
 	typedef Common::U32String U32String;
 	typedef Common::Array<Common::U32String> U32StringArray;
 protected: