Added submodule contents into tree

externals/mbedtls/programs/util/strerror.c

@@ -0,0 +1,61 @@
+/*
+ *  Translate error code to error string
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/platform.h"
+
+#if defined(MBEDTLS_ERROR_C) || defined(MBEDTLS_ERROR_STRERROR_DUMMY)
+#include "mbedtls/error.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#endif
+
+#define USAGE \
+    "\n usage: strerror <errorcode>\n" \
+    "\n where <errorcode> can be a decimal or hexadecimal (starts with 0x or -0x)\n"
+
+#if !defined(MBEDTLS_ERROR_C) && !defined(MBEDTLS_ERROR_STRERROR_DUMMY)
+int main(void)
+{
+    mbedtls_printf("MBEDTLS_ERROR_C and/or MBEDTLS_ERROR_STRERROR_DUMMY not defined.\n");
+    mbedtls_exit(0);
+}
+#else
+int main(int argc, char *argv[])
+{
+    long int val;
+    char *end = argv[1];
+
+    if (argc != 2) {
+        mbedtls_printf(USAGE);
+        mbedtls_exit(0);
+    }
+
+    val = strtol(argv[1], &end, 10);
+    if (*end != '\0') {
+        val = strtol(argv[1], &end, 16);
+        if (*end != '\0') {
+            mbedtls_printf(USAGE);
+            return 0;
+        }
+    }
+    if (val > 0) {
+        val = -val;
+    }
+
+    if (val != 0) {
+        char error_buf[200];
+        mbedtls_strerror(val, error_buf, 200);
+        mbedtls_printf("Last error was: -0x%04x - %s\n\n", (unsigned int) -val, error_buf);
+    }
+
+    mbedtls_exit(val);
+}
+#endif /* MBEDTLS_ERROR_C */