Support wide characters in printf %c

builtin_printf.cpp

@@ -467,6 +467,7 @@ void builtin_printf_state_t::print_direc(const wchar_t *start, size_t length, wc
             fmt.append(L"L");
             break;
         case L's':
+        case L'c':
             fmt.append(L"l");
             break;
         default:

tests/printf.in

@@ -4,6 +4,7 @@ printf "%x %X %o %llu\n" 10 11 8 -1
 printf "%a %A\n" 14 15
 
 printf "%c %s\n" a hello
+printf "%c%c%c\n" hello … o
 printf "%e %E\n" 5 6
 
 printf "%20d\n" 50

tests/printf.out

@@ -2,6 +2,7 @@ Hello 1 2 3.000000 4.000000 5 6
 a B 10 18446744073709551615
 0xep+0 0XFP+0
 a hello
+h…o
 5.000000e+00 6.000000E+00
                   50
 5                   10