5 files changed, 8 insertions, 8 deletions
diff --git a/engines/sci/engine/kstring.cpp b/engines/sci/engine/kstring.cpp
index a1cd571e89..fe8d631497 100644
--- a/engines/sci/engine/kstring.cpp
+++ b/engines/sci/engine/kstring.cpp
@@ -147,7 +147,7 @@ reg_t kReadNumber(EngineState *s, int argc, reg_t *argv) {
 	Common::String source_str = s->_segMan->getString(argv[0]);
 	const char *source = source_str.c_str();
 
-	while (isspace((unsigned char)*source))
+	while (Common::isSpace(*source))
 		source++; /* Skip whitespace */
 
 	int16 result = 0;
@@ -246,14 +246,14 @@ reg_t kFormat(EngineState *s, int argc, reg_t *argv) {
 
 			/* int writelength; -- unused atm */
 
-			if (xfer && (isdigit(static_cast<unsigned char>(xfer)) || xfer == '-' || xfer == '=')) {
+			if (xfer && (Common::isDigit(xfer) || xfer == '-' || xfer == '=')) {
 				char *destp;
 
 				if (xfer == '0')
 					fillchar = '0';
 				else if (xfer == '=')
 					align = ALIGN_CENTER;
-				else if (isdigit(static_cast<unsigned char>(xfer)) || (xfer == '-'))
+				else if (Common::isDigit(xfer) || (xfer == '-'))
 					source--; // Go to start of length argument
 
 				strLength = strtol(source, &destp, 10);
diff --git a/engines/sci/graphics/text16.cpp b/engines/sci/graphics/text16.cpp
index 84547d9828..7eaa0168b8 100644
--- a/engines/sci/graphics/text16.cpp
+++ b/engines/sci/graphics/text16.cpp
@@ -100,7 +100,7 @@ int16 GfxText16::CodeProcessing(const char *&text, GuiResourceId orgFontId, int1
 	//  cX -> sets textColor to _textColors[X-1]
 	curCode = textCode[0];
 	curCodeParm = textCode[1];
-	if (isdigit(static_cast<unsigned char>(curCodeParm))) {
+	if (Common::isDigit(curCodeParm)) {
 		curCodeParm -= '0';
 	} else {
 		curCodeParm = -1;
diff --git a/engines/sci/parser/vocabulary.cpp b/engines/sci/parser/vocabulary.cpp
index a5c4686b3b..e56158ecc1 100644
--- a/engines/sci/parser/vocabulary.cpp
+++ b/engines/sci/parser/vocabulary.cpp
@@ -534,7 +534,7 @@ bool Vocabulary::tokenizeString(ResultWordListList &retval, const char *sentence
 	do {
 
 		c = sentence[pos_in_sentence++];
-		if (isalnum(c) || (c == '-' && wordLen) || (c >= 0x80)) {
+		if (Common::isAlnum(c) || (c == '-' && wordLen) || (c >= 0x80)) {
 			currentWord[wordLen] = lowerCaseMap[c];
 			++wordLen;
 		}
diff --git a/engines/sci/resource.cpp b/engines/sci/resource.cpp
index 41062eb19b..50b3387159 100644
--- a/engines/sci/resource.cpp
+++ b/engines/sci/resource.cpp
@@ -1558,7 +1558,7 @@ void ResourceManager::readResourcePatches() {
 			name = (*x)->getName();
 
 			// SCI1 scheme
-			if (isdigit(static_cast<unsigned char>(name[0]))) {
+			if (Common::isDigit(name[0])) {
 				char *end = 0;
 				resourceNr = strtol(name.c_str(), &end, 10);
 				bAdd = (*end == '.'); // Ensure the next character is the period
@@ -1566,7 +1566,7 @@ void ResourceManager::readResourcePatches() {
 				// SCI0 scheme
 				int resname_len = strlen(szResType);
 				if (scumm_strnicmp(name.c_str(), szResType, resname_len) == 0
-					&& !isalpha(static_cast<unsigned char>(name[resname_len + 1]))) {
+					&& !Common::isAlpha(name[resname_len + 1])) {
 					resourceNr = atoi(name.c_str() + resname_len + 1);
 					bAdd = true;
 				}
diff --git a/engines/sci/resource_audio.cpp b/engines/sci/resource_audio.cpp
index 764f4785b7..684e1a1d0d 100644
--- a/engines/sci/resource_audio.cpp
+++ b/engines/sci/resource_audio.cpp
@@ -198,7 +198,7 @@ void ResourceManager::readWaveAudioPatches() {
 	for (Common::ArchiveMemberList::const_iterator x = files.begin(); x != files.end(); ++x) {
 		Common::String name = (*x)->getName();
 
-		if (isdigit(static_cast<unsigned char>(name[0])))
+		if (Common::isDigit(name[0]))
 			processWavePatch(ResourceId(kResourceTypeAudio, atoi(name.c_str())), name);
 	}
 }