added trim operand function.

ZString.cpp

@@ -362,6 +362,12 @@ namespace coreutils {
       return cursor >= data + length;
    }
 
+   int ZString::goeod() {
+      char *temp = cursor;
+      cursor = data + length;
+      return cursor - temp;
+   }
+   
    bool ZString::startsWith(const char *value) {
       return strncmp(cursor, value, strlen(value)) == 0;
    }
@@ -455,6 +461,19 @@ namespace coreutils {
       return len;
    }
 
+   int ZString::trimTrailingWhitespace() {
+      goeod();
+      int len = 0;
+      --cursor;
+      while((cursor > data) && ((*cursor == ' ') || (*cursor == '\n') || (*cursor == '\t'))) {
+	 --cursor;
+	 --length;
+	 ++len;
+      }      
+      ++cursor;
+      return len;
+   }
+   
    bool ZString::lineIsWhitespace() {
       char *end = data + length;
       char *temp = cursor;
@@ -496,6 +515,8 @@ namespace coreutils {
    }
 
    ZString ZString::trim() {
+      trimTrailingWhitespace();
+      reset();
       skipWhitespace();
       return unparsed();
    }

ZString.h

@@ -248,6 +248,14 @@ namespace coreutils {
       ///
       
       bool eod();
+
+      ///
+      /// Go to the end of data.
+      ///
+      /// Return number of bytes the cursor was moved. 
+      ///
+
+      int goeod();
       
       ///
       ///
@@ -312,7 +320,7 @@ namespace coreutils {
       
       ///
       /// Advance the cursor through the ZString for each whitespace character
-      /// encountered.
+      /// encountered. 
       ///
       
       int skipWhitespace();
@@ -321,6 +329,12 @@ namespace coreutils {
       ///
       ///
 
+      int trimTrailingWhitespace();
+      
+      ///
+      ///
+      ///
+
       bool lineIsWhitespace();
       
       ///

testing/compile

@@ -1,4 +1,4 @@
 #!/bin/bash
-#g++ -g -std=c++20 -o zstring_test zstring_test.cpp -I.. -L.. -lCoreUtils
+g++ -g -std=c++20 -o zstring_test zstring_test.cpp -I.. -L.. -lCoreUtils
 g++ -g -std=c++20 -o mstring_test mstring_test.cpp -I.. -L.. -lCoreUtils
 g++ -o jstring_test jstring_test.cpp -I.. -L.. -lCoreUtils

testing/zstring_test.cpp

@@ -122,5 +122,8 @@ int main(int argc, char **argv) {
    std::cout << "integer '53524534' is [" << test24 << "]" << std::endl;
    coreutils::ZString test25("-543");
    std::cout << "integer '-543' is [" << test25 << "]" << std::endl;
+
+   coreutils::ZString test26("     this is a trim test     ");
+   std::cout << "trimmed [" << test26.trim() << "]" << std::endl;
    
 }