From 3e758ef235793502061edd122cd5cd91172faf51 Mon Sep 17 00:00:00 2001
From: Thorsten von Eicken
Date: Fri, 29 May 2020 13:05:47 -0700
Subject: lib/mbedtls_errors: Add code to patch mbedtls for shortened error
 strs.

The file `mbedtls_errors/mp_mbedtls_errors.c` can be used instead of
`mbedtls/library/error.c` to give shorter error strings, reducing the build
size of the error strings from about 12-16kB down to about 2-5kB.
---
 lib/mbedtls_errors/generate_errors.diff | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 lib/mbedtls_errors/generate_errors.diff

(limited to 'lib/mbedtls_errors/generate_errors.diff')

diff --git a/lib/mbedtls_errors/generate_errors.diff b/lib/mbedtls_errors/generate_errors.diff
new file mode 100644
index 000000000..ad24c372f
--- /dev/null
+++ b/lib/mbedtls_errors/generate_errors.diff
@@ -0,0 +1,22 @@
+--- generate_errors_orig.pl	2020-06-20 08:40:38.819060379 -0700
++++ generate_errors.pl	2020-06-20 08:47:26.511163591 -0700
+@@ -162,16 +162,12 @@
+ 
+     if ($error_name eq "MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE")
+     {
+-        ${$code_check} .= "${white_space}if( use_ret == -($error_name) )\n".
+-                          "${white_space}\{\n".
+-                          "${white_space}    mbedtls_snprintf( buf, buflen, \"$module_name - $description\" );\n".
+-                          "${white_space}    return;\n".
+-                          "${white_space}}\n"
++        # no-op, this case is hard-coded in error.fmt
+     }
+     else
+     {
+-        ${$code_check} .= "${white_space}if( use_ret == -($error_name) )\n".
+-                          "${white_space}    mbedtls_snprintf( buf, buflen, \"$module_name - $description\" );\n"
++         my $error_text = $error_name =~ s/^MBEDTLS_ERR_//r;
++         ${$code_check} .= "${white_space}{ -($error_name), \"$error_text\" },\n"
+     }
+ };
+ 
-- 
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