Feature [feature-requests:#1408] Avoid sprintf for hexadecimal character blobs.

3 files changed, 13 insertions, 5 deletions

diff --git a/src/EditView.cxx b/src/EditView.cxx
index a71f385e7..e4b0fa5d9 100644
--- a/src/EditView.cxx
+++ b/src/EditView.cxx
@@ -170,6 +170,13 @@ void DrawStyledText(Surface *surface, const ViewStyle &vs, int styleOffset, PRec
 	}
 }
 
+void Hexits(char *hexits, int ch) noexcept {
+	hexits[0] = 'x';
+	hexits[1] = "0123456789ABCDEF"[ch / 0x10];
+	hexits[2] = "0123456789ABCDEF"[ch % 0x10];
+	hexits[3] = 0;
+}
+
 }
 
 EditView::EditView() {
@@ -1040,7 +1047,7 @@ void EditView::DrawEOL(Surface *surface, const EditModel &model, const ViewStyle
 				if (UTF8IsAscii(chEOL)) {
 					ctrlChar = ControlCharacterString(chEOL);
 				} else {
-					sprintf(hexits, "x%2X", chEOL);
+					Hexits(hexits, chEOL);
 					ctrlChar = hexits;
 				}
 			}
diff --git a/src/EditView.h b/src/EditView.h
index 148d6e52d..bac59ed31 100644
--- a/src/EditView.h
+++ b/src/EditView.h
@@ -40,6 +40,7 @@ void DrawTextNoClipPhase(Surface *surface, PRectangle rc, const Style &style, XY
 	std::string_view text, DrawPhase phase);
 void DrawStyledText(Surface *surface, const ViewStyle &vs, int styleOffset, PRectangle rcText,
 	const StyledText &st, size_t start, size_t length, DrawPhase phase);
+void Hexits(char *hexits, int ch) noexcept;
 
 typedef void (*DrawTabArrowFn)(Surface *surface, PRectangle rcTab, int ymid,
 	const ViewStyle &vsDraw, Stroke stroke);
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 71aaeae53..d01eb0cdf 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -247,8 +247,8 @@ void Editor::SetRepresentations() {
 	if (IsUnicodeMode()) {
 		for (int k=0x80; k < 0x100; k++) {
 			const char hiByte[2] = {  static_cast<char>(k), 0 };
-			char hexits[5];	// Really only needs 4 but that causes warning from gcc 7.1
-			sprintf(hexits, "x%2X", k);
+			char hexits[4];
+			Hexits(hexits, k);
 			reprs.SetRepresentation(hiByte, hexits);
 		}
 	} else if (pdoc->dbcsCodePage) {
@@ -257,8 +257,8 @@ void Editor::SetRepresentations() {
 			const char ch = static_cast<char>(k);
 			if (pdoc->IsDBCSLeadByteNoExcept(ch)  || pdoc->IsDBCSLeadByteInvalid(ch)) {
 				const char hiByte[2] = { ch, 0 };
-				char hexits[5];	// Really only needs 4 but that causes warning from gcc 7.1
-				sprintf(hexits, "x%2X", k);
+				char hexits[4];
+				Hexits(hexits, k);
 				reprs.SetRepresentation(hiByte, hexits);
 			}
 		}