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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd



%%	header

/**	@file
	Get language, region and encoding.

	CRT on Windows: Optional, disabling CRT degrades performance.
*/

#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif



#ifdef __cplusplus
extern "C" {
#endif

/**	Retrieve localization settings.
	@param	lang	Result buffer for language name.
	@param	szlang	Size of result buffer (number of dkChar).
	@param	reg	Result buffer for region or country name.
	@param	szreg	Size of result buffer (number of dkChar).
	@param	enc	Address of result variable for encoding.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.

	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if one of lang, reg or enc is NULL or szlang or szreg is 0,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if one of the involved buffers is too small,
*/
int
dk4loc_get_settings(
  dkChar	*lang,
  size_t	 szlang,
  dkChar	*reg,
  size_t	 szreg,
  int		*enc,
  dk4_er_t	*erp
);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4loc.h"

#ifndef STDLIB_H_INCLUDED
#include <stdlib.h>
#define	STDLIB_H_INCLUDED 1
#endif

#if DK4_HAVE_STRING_H
#ifndef STRING_H_INCLUDED
#include <string.h>
#define STRING_H_INCLUDED 1
#endif
#endif

#if DK4_HAVE_CTYPE_H
#ifndef CTYPE_H_INCLUDED
#include <ctype.h>
#define	CTYPE_H_INCLUDED 1
#endif
#endif

#ifndef DK4ENC_H_INCLUDED
#include "dk4enc.h"
#endif

#ifndef DK4STR8_H_INCLUDED
#include "dk4str8.h"
#endif

#if DK4_ON_WINDOWS

#ifndef DK4WREG8_H_INCLUDED
#include "dk4wreg8.h"
#endif
#ifndef DK4WREGC_H_INCLUDED
#include "dk4wregc.h"
#endif

#endif


$!trace-include



/**	Keywords used by the module.
*/
static const char * const dk4loc_mod_kw_8[] = {
$!string-table
#
#	0	Environment variable name for Linux/Unix.
#
LANG
#
#	1 2	Encoding names for UTF-8
#
utf8
UTF-8
#
#	3 4 5	Registry key and entry for localization
#
Control Panel\\International
LocaleName
sLanguage
$!end
};



static
int
dk4loc_use_default(dkChar *lptr, size_t szl, dk4_er_t *erp)
{
  int		 back = 0;
  if ((NULL != lptr) && (2 < szl)) {
    lptr[0] = dkT('e');
    lptr[1] = dkT('n');
    lptr[2] = dkT('\0');
    back = 1;
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
  }
  return back;
}


int
dk4loc_get_settings(
  dkChar	*lang,
  size_t	 szlang,
  dkChar	*reg,
  size_t	 szreg,
  int		*enc,
  dk4_er_t	*erp
)
{
#if DK4_ON_WINDOWS
  char		 buf[64];	/* Buffer to process getenv result */
  void		*kptr;		/* Registry key pointer */
  dkChar	*pd;		/* Copy string */
  char		*p3;		/* Region */
  char		*p4;		/* Copy string */
  size_t	 sz;		/* String length */
  int		 res;		/* Result from RegQueryValueEx() */
  int		 expand	= 0;	/* Flag: Expansion necessary. */
#else
  char		 buf[64];	/* Buffer to process getenv result */
  dkChar	*pd;		/* Copy string */
  char		*p1;		/* Result from getenv */
  char		*p2;		/* Encoding */
  char		*p3;		/* Region */
  char		*p4;		/* Copy string */
  size_t	 sz;		/* String length */
#endif
  int		 back	=	0;
  $? "+ dk4loc_get_settings %d %u %d %u %d %d", TR_IPTR(lang), (unsigned)szlang, TR_IPTR(reg), (unsigned)szreg, TR_IPTR(enc), TR_IPTR(erp)
  if ((NULL != lang) && (0 < szlang)) { *lang = dkT('\0'); }
  if ((NULL != reg ) && (0 < szreg )) { *reg = dkT('\0'); }
  if (NULL != enc) { *enc = DK4_ENCODING_ASCII; }
  if ((NULL != lang) && (NULL != reg) && (NULL != enc)) {
    if ((0 < szlang) && (0 < szreg)) {
#if DK4_ON_WINDOWS
#if DK4_CHAR_SIZE > 1
      *enc = DK4_ENCODING_UTF16;
#else
      *enc = DK4_ENCODING_ASCII;
#endif
      kptr = dk4wreg_open_key_c8(DK4_WREGKEY_HKCU, dk4loc_mod_kw_8[3], 0, erp);
      if (NULL != kptr) {
        res = dk4wreg_get_string_c8(
	  kptr, dk4loc_mod_kw_8[4], buf, sizeof(buf), &expand, erp
	);
	if (0 != res) {
	  p3 = dk4str8_chr(buf, '-');
	  if (NULL != p3) { *(p3++) = '\0'; }
	  dk4str8_normalize(buf, NULL);
	  if (NULL != p3) { dk4str8_normalize(p3, NULL); }
	  sz = dk4str8_len(buf);
	  if (0 < sz) {
	    if (szlang > sz) {
	      /* strcpy(lang, buf); */
	      pd = lang; p4 = buf;
	      while('\0' != *p4) {
		*(pd++) = (dkChar)dk4str8_tolower(*(p4++));
	      }
	      *pd = dkT('\0');
	      back = 1;
	      sz = dk4str8_len(p3);
	      if (0 < sz) {
	        if (szreg > sz) {
		  /* strcpy(reg, p3); */
		  pd = reg; p4 = p3;
		  while('\0' != *p4) {
#if 0
		    *(pd++) = (dkChar)(tolower((unsigned char)(*(p4++))));
#endif
		    *(pd++) = (dkChar)dk4str8_tolower(*(p4++));
		  }
		  *pd = dkT('\0');
		} else {
		  dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
		  back = 0;
		}
	      }
	    } else {
	      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	    }
	  } else {
	    back = dk4loc_use_default(lang, szlang, erp);
	  }
	} else {
	  res = dk4wreg_get_string_c8(
	    kptr, dk4loc_mod_kw_8[5], buf, sizeof(buf), &expand, erp
	  );
	  if (0 != res) {
	    dk4str8_normalize(buf, NULL);
	    sz = dk4str8_len(buf);
	    if (2 < sz) { buf[2] = '\0'; }
	    sz = dk4str8_len(buf);
	    if (0 < sz) {
	      if (szlang > sz) {
	        pd = lang; p4 = buf;
		while ('\0' != *p4) {
		  *(pd++) = (dkChar)(tolower((unsigned char)(*(p4++))));
		}
		*pd = dkT('\0');
		back = 1;
	      } else {
	        dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	      }
	    } else {
	      back = dk4loc_use_default(lang, szlang, erp);
	    }
	  } else {
	    back = dk4loc_use_default(lang, szlang, erp);
	  }
	}
        dk4wreg_close_key(kptr);
      } else {
        back = dk4loc_use_default(lang, szlang, erp);
      }
#else
      p1 = getenv(dk4loc_mod_kw_8[0]);
      if (NULL != p1) {				$? ". getenv ok"
        if (sizeof(buf) > dk4str8_len(p1)) {		$? ". length ok"
	  dk4str8_cpy_s(buf, sizeof(buf), p1, NULL);
	  p2 = dk4str8_chr(buf, '.');
	  if (NULL != p2) {			$? ". p2 has encoding"
	    *(p2++) = '\0';			$? ". encoding \"%!8s\"", p2
	  }
	  p3 = dk4str8_chr(buf, '_');
	  if (NULL != p3) {			$? ". p3 has region"
	    *(p3++) = '\0';			$? ". region \"%!8s\"", p3
	  }					$? ". language \"%!8s\"", buf
	  dk4str8_normalize(buf, NULL);		$? ". normalized"
	  if (NULL != p2) { dk4str8_normalize(p2, NULL); }
	  if (NULL != p3) { dk4str8_normalize(p3, NULL); }
	  sz = dk4str8_len(buf);			$? ". buf lgt %u", (unsigned)sz
	  if (0 < sz) {
	    if (szlang > sz) {
	      /* strcpy(lang, buf); */
	      pd = lang; p4 = buf;
	      while('\0' != *p4) {
	        *(pd++) = (dkChar)(tolower((unsigned char)(*(p4++))));
	      }
	      *pd = dkT('\0');
	      back = 1;
	      if (NULL != p3) {
	        sz = dk4str8_len(p3);
	        if (0 < sz) {
		  if (szreg > sz) {
		    /* strcpy(reg, p3); */
		    pd = reg; p4 = p3;
		    while('\0' != *p4) {
		      *(pd++) = (dkChar)(tolower((unsigned char)(*(p4++))));
		    }
		    *pd = dkT('\0');
		  } else {
		    dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
		    back = 0;
		  }
		}
	      }
#if DK4_CHAR_SIZE > 1
#if DK4_CHAR_SIZE > 2
	     $? ". 32 bit"
	      *enc = DK4_ENCODING_32;
#else
	      $? ". 16 bit"
	      *enc = DK4_ENCODING_UTF16;
#endif
#else
	      $? ". 8 bit"
	      *enc = DK4_ENCODING_ASCII;
	      if (NULL != p2) {
	        if (0 == dk4str8_casecmp(p2, dk4loc_mod_kw_8[1])) {
		  *enc = DK4_ENCODING_UTF8;
		} else {
		  if (0 == dk4str8_casecmp(p2, dk4loc_mod_kw_8[2])) {
		    *enc = DK4_ENCODING_UTF8;
		  }
		}
	      }
#endif
	    } else {				$? "! LANG too long"
	      dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	    }
	  } else {				$? "! zero length LANG"
	    back = dk4loc_use_default(lang, szlang, erp);
	  }
	} else {				$? "! LANG env too long"
	  dk4error_set_simple_error_code(erp, DK4_E_BUFFER_TOO_SMALL);
	}
      } else {					$? "! getenv"
        back = dk4loc_use_default(lang, szlang, erp);
      }
#endif
    } else {					$? "! invalid args"
      dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
    }
  } else {					$? "! invalid args"
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } $? "- dk4loc_get_settings %d", back
  return back;
}