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Turkish locale bug

From: Sezai YILMAZ <sezaiy(at)ata(dot)cs(dot)hun(dot)edu(dot)tr>
To: pgsql-bugs(at)postgresql(dot)org
Subject: Turkish locale bug
Date: 2001-02-19 11:50:05
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Lists: pgsql-bugspgsql-hackers
Your name               : Sezai YILMAZ      
Your email address      : sezaiy(at)ata(dot)cs(dot)hun(dot)edu(dot)tr

System Configuration
  Architecture (example: Intel Pentium)         : AMD Duron

  Operating System (example: Linux 2.0.26 ELF)  : Linux 2.2.17 ELF

  PostgreSQL version (example: PostgreSQL-7.0):   PostgreSQL-7.0.3

  Compiler used (example:  gcc 2.8.0)           : gcc 2.95.3

Please enter a FULL description of your problem:

Locale support for Turkish causes a problem. The problem is with 
character 'I' (capital of character of English alphabet). 
When character 'I' is given to tolower() function and locale is 
set to "tr_TR", it downgrades to special Turkish character 'ı' 
(its is called "y acute"), not 'i'. This causes the following 

With Turkish locale it is not possible to write SQL queries in 
CAPITAL letters. SQL identifiers like "INSERT" and "UNION" first 
are downgraded to "ınsert" and "unıon". Then "ınsert" and "unıon" 
does not match as SQL identifier.

Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible: 

When you set "LC_ALL" environment variable to "tr_TR" this 
problem happens.

If you know how this problem might be fixed, list the solution below:

In file:


This block uses function tolower() which is affected by locale 
settings of the shell which runs postmaster.

{identifier}    {
                    int i;
                    ScanKeyword             *keyword;

                    for(i = 0; yytext[i]; i++)
                          if (isascii((unsigned char)yytext[i]) &&
                                yytext[i] = tolower(yytext[i]);

I think it should be better to use another thing which does what 
function tolower() does but only in English language. This should
stay in English locale. I think this will solve the problem.

'a' - 'A' = 32

So we can use the following line instead of the last line marked 
in above block.

yytext[i] += 32;


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