ANALYSIS: Add static casts to is* functions

This fixes a potential problem with passing char values that would be sign-extended and yield unexpected results.
See http://msdn.microsoft.com/en-us/library/ms245348.aspx

2 files changed, 6 insertions, 6 deletions

diff --git a/engines/scumm/smush/smush_player.cpp b/engines/scumm/smush/smush_player.cpp
index 66502572de..2f4e86bf61 100644
--- a/engines/scumm/smush/smush_player.cpp
+++ b/engines/scumm/smush/smush_player.cpp
@@ -90,13 +90,13 @@ public:
 			assert(def_end != NULL);
 
 			char *id_end = def_end;
-			while (id_end >= def_start && !isdigit(*(id_end-1))) {
+			while (id_end >= def_start && !isdigit(static_cast<unsigned char>(*(id_end-1)))) {
 				id_end--;
 			}
 
 			assert(id_end > def_start);
 			char *id_start = id_end;
-			while (isdigit(*(id_start - 1))) {
+			while (isdigit(static_cast<unsigned char>(*(id_start - 1)))) {
 				id_start--;
 			}
 
diff --git a/engines/scumm/string.cpp b/engines/scumm/string.cpp
index 4b3207c6bf..2d2209c155 100644
--- a/engines/scumm/string.cpp
+++ b/engines/scumm/string.cpp
@@ -1383,10 +1383,10 @@ void ScummEngine_v7::loadLanguageBundle() {
 			} else if (*ptr == '#') {
 				// Number of subtags following a given basetag. We don't need that
 				// information so we just skip it
-			} else if (isdigit(*ptr)) {
+			} else if (isdigit(static_cast<unsigned char>(*ptr))) {
 				int idx = 0;
 				// A number (up to three digits)...
-				while (isdigit(*ptr)) {
+				while (isdigit(static_cast<unsigned char>(*ptr))) {
 					idx = idx * 10 + (*ptr - '0');
 					ptr++;
 				}
@@ -1424,12 +1424,12 @@ void ScummEngine_v7::loadLanguageBundle() {
 		for (i = 0; i < _languageIndexSize; i++) {
 			// First 8 chars in the line give the string ID / 'tag'
 			int j;
-			for (j = 0; j < 8 && !isspace(*ptr); j++, ptr++)
+			for (j = 0; j < 8 && !isspace(static_cast<unsigned char>(*ptr)); j++, ptr++)
 				_languageIndex[i].tag[j] = toupper(*ptr);
 			_languageIndex[i].tag[j] = 0;
 
 			// After that follows a single space which we skip
-			assert(isspace(*ptr));
+			assert(isspace(static_cast<unsigned char>(*ptr)));
 			ptr++;
 
 			// Then comes the translated string: we record an offset to that.