Use stricter input validation when looking for a string as input (bug #42651). * data.cc (get_sort_mode_option, Fissorted): Use is_string() to check string input. * debug.cc (Fdbstep): use "string" rather than "character string" in error messages. * error.cc (Flasterr, Flastwarn): use "string" rather than "character string" in error messages. * file-io.cc (do_stream_open, do_fread, do_fwrite, Fpopen, Ftempname, Fmkstemp): Use is_string() to check string input. * graphics.cc (Fgraphics_toolkit): Use is_string() to check string input. Rephrase error message. * help.cc (F__list_functions): Use is_string() to check string input. * input.cc (Fyes_or_no): Use is_string() to check string input. Rephrase error message. * input.cc (Fadd_input_event_hook): Rephrase error message. * load-path.cc (Fgenpath, Faddpath): Rephrase error message. * matrix_type.cc (Fmatrix_type): Use is_string() to check string input. * qz.cc (Fqz): Follow Octave coding convention for space after '!'. * regexp.cc (parse_options): Use is_string() to check string input. Rephrase error message. * schur.cc (Fschur): Use is_string() to check string input. * strfns.cc (Flist_in_columns): Use is_string() to check string input. Rephrase error message. * symtab.cc (Fignore_function_time_stamp): Use is_string() to check string input. Rephrase error message. * syscalls.cc (Fexec, Fpopen2, Fcanonicalize_file_name): Use is_string() to check string input. Rephrase error message. * sysdep.cc (Fsetenv): Use is_string() to check string input. * time.cc (Fstrftime, Fstrptime): Use is_string() to check string input. * toplev.cc (Fsystem, Fatexit): Use is_string() to check string input. * urlwrite.cc (Furlwrite, Furlread): Rephrase error message. * utils.cc (Ffile_in_path): Use is_string() to check string input. Rephrase error message. * variables.cc (extract_function): Add FIXME about potentially using is_string. * variables.cc (do_isglobal, Fmunlock, Fmislocked): Use is_string() to check string input. * variables.cc (set_internal_variable): Rephrase error message. * ov-base.cc (make_idx_args): Rephrase error message. * ov-class.cc (octave_class::all_strings, Fclass): Rephrase error message. * ov-fcn-handle.cc (Fstr2func): Use is_string() to check string input * ov-java.cc (FjavaObject, FjavaMethod, F__java_get__, F__java_set__): Use is_string() to check string input. * ov.cc (Fdecode_subscripts): Use is_string() to check string input. Rephrase error message. * pt-idx.cc (tree_index_expression::get_struct_index): Rephrase error message. * io.tst: Change %!warning test to %!error test to match stricter checking. * system.tst: Change %!warning test for setenv to %!error test to match stricter checking.

--- a/libinterp/octave-value/ov-class.cc	Mon Dec 15 22:16:25 2014 -0800
+++ b/libinterp/octave-value/ov-class.cc	Tue Dec 16 09:21:29 2014 -0800
@@ -1063,7 +1063,7 @@
           if (tmp(0).is_string ())
             retval = tmp(0).all_strings (pad);
           else
-            error ("cname/char method did not return a character string");
+            error ("cname/char method did not return a string");
         }
     }
   else
@@ -1923,7 +1923,7 @@
             error ("class: invalid call from outside class constructor or method");
         }
       else
-        error ("class: ID (class name) must be a character string");
+        error ("class: ID (class name) must be a string");
     }
 
   return retval;