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Re: Invalid tm_zone from localtime() when TZ is not set

Am 26.05.2016 um 08:54 schrieb KOBAYASHI Shinji:
On Wed, 25 May 2016 22:02:50 +0200, Hans-Bernhard BrÃker wrote:
On May 25 11:28, KOBAYASHI Shinji wrote:

- isupper is a macro which classifies ASCII integer values by table
- It is defined only when isascii(c) is true or c is EOF.

That restriction is artificial, at best. I might go so far as to say it's a direct standard violation since, according to the C Standard, the <ctype.h> macros/functions are defined for the entire range of unsigned char, not just ASCII's 0 ... 127.

It's also untrue. Once you set the locale and the console character set accordingly, Cygwin's isupper() does work for characters outside the 7-bit ASCII range, too:

$ ./tisupper.exe a A b B Ã Ã Ã
a: isupper=0
A: isupper=1
b: isupper=0
B: isupper=1
Ã: isupper=0
Ã: isupper=1
Ã: isupper=0

This is with a ISO-Latin-15 mintty, and LANG set to de_DE (note: no UTF-8), running this program:

#include <stdio.h>
#include <ctype.h>
#include <locale.h>

int main(int argc, char **argv)
	int i = 0;
	setlocale(LC_ALL, "");
	for (i = 1; i < argc; i++) {
		printf("%c: isupper=%d\n",
		       isupper((unsigned char)argv[i][0])
	return 0;

On Wed, 25 May 2016 10:44:30 +0200, Corinna Vinschen wrote:
However, testing this with GLibc it turns out that GLibc's towlower does not
transform the character but returns 0xff21.  Can anybody explain to me why?

It seems that it depends on locale. The man page (on Linux) says:

  The behavior of towlower() depends on the LC_CTYPE category of the
  current locale.

So does the implementation in Cygwin. The result of my little test is influenced by locale. E.g. in Russian locale, Ã is no longer classified an upper-case letter.

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