Add new utility function 'trim'

Right now used in TAP tests.

Author: JavierJF

include/proxysql_utils.h

@@ -298,6 +298,13 @@ std::string replace_str(const std::string& str, const std::string& match, const
  */
 std::vector<std::string> split_str(const std::string& s, char delimiter);
 
+ /**
+  * @brief Trims leading and trailing whitespace from a string.
+  * @param s A string to trim (rvalue reference). The string will be modified in place.
+  * @return The trimmed string (the modified input string).
+  */
+std::string trim(std::string&& s);
+
 std::string generate_multi_rows_query(int rows, int params);
 
 /**

lib/proxysql_utils.cpp

@@ -2,10 +2,8 @@
 #include "mysqld_error.h"
 
 #include <algorithm>
-#include <functional>
 #include <sstream>
 #include <algorithm>
-#include <climits>
 
 #include <fcntl.h>
 #include <poll.h>
@@ -17,7 +15,6 @@
 #include <string.h>
 #include <unistd.h>
 
-using std::function;
 using std::string;
 using std::unique_ptr;
 using std::vector;
@@ -401,6 +398,13 @@ std::string replace_str(const std::string& str, const std::string& match, const
 	return result;
 }
 
+string trim(string&& s) {
+	s.erase(0, s.find_first_not_of(" \n\r\t"));
+	s.erase(s.find_last_not_of(" \n\r\t") + 1);
+
+	return s;
+}
+
 std::string generate_multi_rows_query(int rows, int params) {
 	std::string s = "";
 	int v = 1;