From 6b6dc218133f406c89ca6446dcaa5ba68f464c2a Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Mon, 9 Dec 2019 21:59:49 +0100
Subject: COMMON: Added helper function to produce printable strings

---
 common/str.cpp | 37 +++++++++++++++++++++++++++++++++++++
 common/str.h   |  9 +++++++++
 2 files changed, 46 insertions(+)

(limited to 'common')

diff --git a/common/str.cpp b/common/str.cpp
index 383a61a687..95b13be2aa 100644
--- a/common/str.cpp
+++ b/common/str.cpp
@@ -1094,6 +1094,43 @@ size_t strnlen(const char *src, size_t maxSize) {
 	return counter;
 }
 
+String toPrintable(const String &in, bool keepNewLines) {
+	Common::String res;
+
+	const char *tr =    "\x01\x02\x03\x04\x05\x06" "a"
+				  //"\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f";
+					   "b" "t" "n" "v" "f" "r\x0e\x0f"
+					"\x10\x11\x12\x13\x14\x15\x16\x17"
+					"\x18\x19\x1a" "e\x1c\x1d\x1e\x1f";
+
+	for (const char *p = in.c_str(); *p; p++) {
+		if (*p == '\n') {
+			if (keepNewLines)
+				res += *p;
+			else
+				res += "\\n";
+
+			continue;
+		}
+
+		if (*p < 0x20 || *p == '\'' || *p == '\"' || *p == '\\') {
+			res += '\\';
+
+			if (*p < 0x20) {
+				if (tr[*p + 1] < 0x20)
+					res += Common::String::format("x%02x", *p);
+				else
+					res += tr[*p + 1];
+			} else {
+				res += *p;	// We will escape it
+			}
+		} else
+			res += *p;
+	}
+
+	return res;
+}
+
 } // End of namespace Common
 
 // Portable implementation of stricmp / strcasecmp / strcmpi.
diff --git a/common/str.h b/common/str.h
index 2c6c142a73..811214bac6 100644
--- a/common/str.h
+++ b/common/str.h
@@ -491,6 +491,15 @@ size_t strnlen(const char *src, size_t maxSize);
  */
 #define tag2str(x)	Common::tag2string(x).c_str()
 
+/**
+ * Converts string with all non-printable characters properly escaped
+ * with use of C++ escape sequences
+ *
+ * @param src The source string.
+ * @param keepNewLines Whether keep newlines or convert them to '\n', default: true.
+ * @return The converted string.
+ */
+String toPrintable(const String &src, bool keepNewLines = true);
 
 } // End of namespace Common
 
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