From: rracine@myremarq.com (Roger Racine)
Subject: Re: CONTRAINT ERROR (was Re: parsing a string)
Date: 2000/01/26
Date: 2000-01-26T13:36:54+00:00 [thread overview]
Message-ID: <388ef706.1991756564@news.draper.com> (raw)
In-Reply-To: 86mm2o$3cd$1@nnrp1.deja.com
On Wed, 26 Jan 2000 11:33:44 GMT, pumilia@est.it wrote:
>In article <uu2k3kszb.fsf@gsfc.nasa.gov>,
> Stephen Leake <Stephen.Leake@gsfc.nasa.gov> wrote:
>
>> Index is a function, which must be assigned to a value, so this can't
>> be the real source. Please include your _complete_ test program, so we
>> can compile it ourselves, to help get a good answer.
>>
>> The default for Map should be fine. You can find out what else you
>> might pass for Map in the package Ada.Strings.Maps.
>>
>> -- Stephe
>>
>
>Ok, i simplified my program, adjusted something thanks to David Hoos's
>and
>your useful comments and found a new error: CONSTRAINT_ERROR.
>
>Here is my test procedure, aimed to converting an unbounded string
>to string and then to parse the string:
>
>-- str2_test --------------------------------------
>with ada.strings.unbounded;
>use ada.strings.unbounded;
>with ustrings;
>use ustrings;
>with text_io;
>with Ada.Integer_Text_IO;
>use text_io;
>with ada.strings.fixed; use ada.strings.fixed;
>
>with Ada.Integer_Text_IO;
>use Ada.Integer_Text_IO;
>
>procedure str2_test is
>
> output_file_string : unbounded_string ;
> output_file : string (1..25) ;
> pos1 : natural;
>
>Begin
>
> get_line(output_file_string);
>
> put(" output: "); put(output_file_string); put("<--"); new_line;
> output_file := to_string(output_file_string);
> put(" Output: "); put(output_file); put("<--"); new_line;
> put(" index: "); pos1 := Index(output_file,"xxx");
> put(pos1);
> new_line;
>
>end str2_test;
>-- str2_test --------------------------------------
>
>
>While executing i get the error:
>
>> raised constraint_error : str2_test.adb:24
>
>This is line 24:
>
> output_file := to_string(output_file_string);
>
>
>Any help wil be appreciiated
>thank you
>Pol
>
>- ustrings.ads ---------------------------------
>-- Ideally this would be a child package of "Ada.Strings.Unbounded".
>
>-- package Ustrings is
>-- procedure Get_Line(Item : out Unbounded_String);
>-- procedure Put(Item : in Unbounded_String);
>-- procedure Put_Line(Item : in Unbounded_String);
>-- end Ustrings;
>--
>-- Copyright (C) 1996 Ada Resource Association (ARA), Columbus, Ohio.
>-- Author: David A. Wheeler
>--
>
The unbounded string Output_File_String can be of any length. The
string Output_File is exactly 25 characters. The following will help:
Ulength : Natural;
...
ULength := Length (Output_File_String);
if ULength > Output_file'Length then
-- Do something to make sure bad input is caught
raise Constraint_Error;
else
Output_File(1 .. ULength) := to_string(output_file_string);
...
end if;
Roger Racine
next prev parent reply other threads:[~2000-01-26 0:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-01-15 0:00 parsing a string Paolo M. Pumilia
2000-01-15 0:00 ` James S. Rogers
2000-01-24 0:00 ` pumilia
2000-01-24 0:00 ` Ehud Lamm
2000-01-24 0:00 ` Stephen Leake
2000-01-26 0:00 ` CONTRAINT ERROR (was Re: parsing a string) pumilia
2000-01-26 0:00 ` Roger Racine [this message]
2000-01-26 0:00 ` Fraser
2000-01-26 0:00 ` Simon Wright
2000-01-26 0:00 ` John English
2000-01-26 0:00 ` Ian Clifton
2000-01-24 0:00 ` parsing a string pumilia
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