Remove extra newline added to files created by write_file and append_file

client/mysqltest.c:
  - Remove the extra newline first in the file produced by
    write_file and append_file
  - Add check for too many arguments passed to 'check_command_args'
mysql-test/r/mysqltest.result:
  Update test result
mysql-test/t/mysqltest.test:
  Add test to check that no extra newline is created

client/mysqltest.c

@@ -753,6 +753,15 @@ void check_command_args(struct st_command *command,
           command->first_word_len, command->query);
 
   }
+  /* Check for too many arguments passed */
+  ptr= command->last_argument;
+  while(ptr <= command->end)
+  {
+    if (*ptr && *ptr != ' ')
+      die("Extra argument '%s' passed to '%.*s'",
+          ptr, command->first_word_len, command->query);
+    ptr++;
+  }
   DBUG_VOID_RETURN;
 }
 
@@ -2691,8 +2700,22 @@ void read_until_delimiter(DYNAMIC_STRING *ds,
     c= my_getc(cur_file->file);
 
     if (c == '\n')
+    {
       cur_file->lineno++;
 
+      /* Skip newline from the same line as the command */
+      if (start_lineno == (cur_file->lineno - 1))
+        continue;
+    }
+    else if (start_lineno == cur_file->lineno)
+    {
+      /*
+        No characters except \n are allowed on
+        the same line as the command
+      */
+      die("Trailing characters found after command");
+    }
+
     if (feof(cur_file->file))
       die("End of file encountered before '%s' delimiter was found",
           ds_delimiter->str);

mysql-test/r/mysqltest.result

@@ -533,6 +533,7 @@ drop table t1;
 mysqltest: At line 1: Missing required argument 'filename' to command 'remove_file'
 mysqltest: At line 1: Missing required argument 'filename' to command 'write_file'
 mysqltest: At line 1: End of file encountered before 'EOF' delimiter was found
+Content for test_file1
 Some data
 for cat_file command
 of mysqltest

mysql-test/t/mysqltest.test

@@ -1564,6 +1564,7 @@ write_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
 Content for test_file1
 EOF
 file_exists $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
+cat_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
 remove_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp;
 
 write_file $MYSQLTEST_VARDIR/tmp/test_file1.tmp END_DELIMITER;