Support # modifier to %o and %x

febb2ae4 · Austin Clements · f2e95a4d · febb2ae4
--- a/lib/fmt.cc
+++ b/lib/fmt.cc
@@ -208,6 +208,8 @@ vprintfmt(void (*putch)(int, void*), void *putdat,
    case 'o':
      num = getuint (ap, lflag);
      base = 8;
+      if (altflag && num)
+        putch ('0', putdat);
      goto number;
      // pointer
@@ -223,6 +225,10 @@ vprintfmt(void (*putch)(int, void*), void *putdat,
    case 'x':
      num = getuint (ap, lflag);
      base = 16;
+      if (altflag && num) {
+        putch ('0', putdat);
+        putch ('x', putdat);
+      }
    number:
      printnum (putch, putdat, num, base, MAX(width, 0), padc);
      break;