From: Emanuele Torre <torreemanuele6@gmail.com>
Date: Sun, 9 Jul 2023 14:45:39 +0000 (+0200)
Subject: tool_writeout_json: fix encoding of control characters
X-Git-Tag: curl-8_2_0~32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8484ad09da10674e62dcd8acc31ff42d67938b67;p=thirdparty%2Fcurl.git

tool_writeout_json: fix encoding of control characters

Control characters without a special escape sequence e.g. %00 or %06
were being encoded as "u0006" instead of "\u0006".

Ref: https://github.com/curl/trurl/pull/214#discussion_r1257487858
Closes #11414
---

diff --git a/src/tool_writeout_json.c b/src/tool_writeout_json.c
index ec9c640b5e..0e4623fe86 100644
--- a/src/tool_writeout_json.c
+++ b/src/tool_writeout_json.c
@@ -62,7 +62,7 @@ void jsonWriteString(FILE *stream, const char *in, bool lowercase)
       break;
     default:
       if(*i < 32) {
-        fprintf(stream, "u%04x", *i);
+        fprintf(stream, "\\u%04x", *i);
       }
       else {
         char out = *i;