[flang][runtime] Handle ';' in fixed-width input field (#150512)

Formatted input of real values can handle a ',' field separator when one
appears in an fixed-width input field, but can't cope with a semicolon
under DECIMAL='COMMA'. Fix.

Fixes llvm/llvm-project#150047.

Author: klausler

flang-rt/lib/runtime/edit-input.cpp

@@ -344,8 +344,8 @@ static RT_API_ATTRS ScannedRealInput ScanRealInput(
   }
   bool bzMode{(edit.modes.editingFlags & blankZero) != 0};
   int exponent{0};
-  if (!next || (!bzMode && *next == ' ') ||
-      (!(edit.modes.editingFlags & decimalComma) && *next == ',')) {
+  const char32_t comma{GetSeparatorChar(edit)};
+  if (!next || (!bzMode && *next == ' ') || *next == comma) {
     if (!edit.IsListDirected() && !io.GetConnectionState().IsAtEOF()) {
       // An empty/blank field means zero when not list-directed.
       // A fixed-width field containing only a sign is also zero;
@@ -545,7 +545,7 @@ static RT_API_ATTRS ScannedRealInput ScanRealInput(
     while (next && (*next == ' ' || *next == '\t')) {
       next = io.NextInField(remaining, edit);
     }
-    if (next && (*next != ',' || (edit.modes.editingFlags & decimalComma))) {
+    if (next && *next != comma) {
       return {}; // error: unused nonblank character in fixed-width field
     }
   }

flang-rt/unittests/Runtime/NumericalFormatTest.cpp

@@ -921,6 +921,7 @@ TEST(IOApiTests, EditDoubleInputValues) {
       {"(BZ,F18.0)", "           .      ", 0x0, 0},
       {"(BZ,F18.0)", "           . e +1 ", 0x0, 0},
       {"(DC,F18.0)", "              12,5", 0x4029000000000000, 0},
+      {"(DC,F18.0)", "             12,5;", 0x4029000000000000, 0},
       {"(EX22.0)", "0X0P0                 ", 0x0, 0}, // +0.
       {"(EX22.0)", "-0X0P0                ", 0x8000000000000000, 0}, // -0.
       {"(EX22.0)", "0X.8P1                ", 0x3ff0000000000000, 0}, // 1.0