From ffa591d5e09389b01c50dd98333fce6b994a11a9 Mon Sep 17 00:00:00 2001
From: Alex Richardson <alexrichardson@google.com>
Date: Fri, 28 Apr 2023 12:28:06 -0700
Subject: [PATCH] Fix --help output for options without a short flag
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Previously --help printed the following:
```
         -V      --no-trace
         -�      --trace-output
         -l      --inst-limit
```
With the new change it is:
```
         -V      --no-trace
                 --trace-output
         -l      --inst-limit
```
---
 c_emulator/riscv_sim.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/c_emulator/riscv_sim.c b/c_emulator/riscv_sim.c
index 5a73896ba..84ee04d3f 100644
--- a/c_emulator/riscv_sim.c
+++ b/c_emulator/riscv_sim.c
@@ -1,3 +1,4 @@
+#include <ctype.h>
 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -156,7 +157,10 @@ static void print_usage(const char *argv0, int ec)
 #endif
   struct option *opt = options;
   while (opt->name) {
-    fprintf(stdout, "\t -%c\t --%s\n", (char)opt->val, opt->name);
+    if (isprint(opt->val))
+      fprintf(stdout, "\t -%c\t --%s\n", (char)opt->val, opt->name);
+    else
+      fprintf(stdout, "\t   \t --%s\n", opt->name);
     opt++;
   }
   exit(ec);