workbench/libs/locale/openlocale.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     OpenLocale() - Give access to a new locale.
   6 */
   7
   8 #include <exec/types.h>
   9 #include <exec/memory.h>
  10 #include <libraries/locale.h>
  11 #include <libraries/iffparse.h>
  12 #include <prefs/prefhdr.h>
  13 #include <proto/dos.h>
  14 #include <prefs/locale.h>
  15 #include <proto/exec.h>
  16 #include <proto/iffparse.h>
  17 #include "locale_intern.h"
  18
  19 #define DEBUG_OPENLOCALE(x)     ;
  20
  21 extern void InitLocale(
  22     STRPTR filename,
  23     struct IntLocale *,
  24     struct LocalePrefs *,
  25     struct LocaleBase *);
  26
  27 /*****************************************************************************
  28
  29     NAME */
  30 #include <proto/locale.h>
  31
  32         AROS_LH1(struct Locale *, OpenLocale,
  33
  34 /*  SYNOPSIS */
  35         AROS_LHA(STRPTR, name, A0),
  36
  37 /*  LOCATION */
  38         struct LocaleBase *, LocaleBase, 26, Locale)
  39
  40 /*  FUNCTION
  41         This function will open for use a named locale. A locale is a
  42         data structure that contains many different parameters that
  43         an application needs in order to localise itself. Using this
  44         information, an application can dynamically adapt to the user's
  45         environment.
  46
  47         Locales are created using the Locale Preferences Editor. If
  48         you pass NULL instead of a name, then you will receive the
  49         current default Locale. This is the normal procedure.
  50
  51     INPUTS
  52         name    -   The name of the locale you wish opened, or NULL
  53                     to open the current default locale. This will
  54                     be an IFF PREF file which contains both LCLE
  55                     and CTRY chunks.
  56
  57     RESULT
  58         A pointer to an initialised Locale structure, or NULL if none
  59         could be opened. If NULL is returned you can use IoErr()
  60         to find out what caused this error.
  61
  62         If you pass NULL, you will always succeed.
  63
  64     NOTES
  65
  66     EXAMPLE
  67
  68     BUGS
  69
  70     SEE ALSO
  71         CloseLocale()
  72
  73     INTERNALS
  74
  75 *****************************************************************************/
  76 {
  77     AROS_LIBFUNC_INIT
  78
  79     struct IntLocale *locale = NULL;
  80
  81     DEBUG_OPENLOCALE(dprintf("OpenLocale: name <%s> localebase 0x%lx\n",
  82                                 name,
  83                                 LocaleBase));
  84
  85     /* Have we been asked for a disk-based locale? */
  86     if(name != NULL)
  87     {
  88         struct IFFHandle *iff;
  89         ULONG error;
  90         struct LocalePrefs *lp;
  91         struct ContextNode *cn;
  92
  93         /* Clear error condition before we start. */
  94
  95         SetIoErr(0);
  96
  97         lp = AllocMem(sizeof(struct LocalePrefs), MEMF_CLEAR);
  98
  99         DEBUG_OPENLOCALE(dprintf("OpenLocale: lp 0x%lx\n",lp));
 100
 101         if( lp == NULL )
 102         {
 103             SetIoErr(ERROR_NO_FREE_STORE);
 104
 105             return NULL;
 106         }
 107
 108         iff = AllocIFF();
 109
 110         DEBUG_OPENLOCALE(dprintf("OpenLocale: iff 0x%lx\n",iff));
 111
 112         if(iff == NULL)
 113         {
 114                 FreeMem(lp, sizeof(struct LocalePrefs));
 115                 SetIoErr(ERROR_NO_FREE_STORE);
 116                 return NULL;
 117         }
 118
 119         iff->iff_Stream = (ULONG)Open(name, MODE_OLDFILE);
 120
 121         DEBUG_OPENLOCALE(dprintf("OpenLocale: stream 0x%lx\n",iff->iff_Stream));
 122
 123         if(iff->iff_Stream == 0)
 124         {
 125                 FreeMem(lp, sizeof(struct LocalePrefs));
 126                 FreeIFF(iff);
 127                 return NULL;
 128         }
 129
 130         InitIFFasDOS(iff);
 131
 132         if(!OpenIFF(iff, IFFF_READ))
 133         {
 134             if(!StopChunk(iff, ID_PREF, ID_LCLE))
 135             {
 136                 while(1)
 137                 {
 138                     error = ParseIFF(iff, IFFPARSE_SCAN);
 139                     if(error == 0)
 140                     {
 141                         cn = CurrentChunk(iff);
 142                         if((cn->cn_ID == ID_LCLE) && (cn->cn_Type == ID_PREF))
 143                         {
 144                             if(ReadChunkBytes(iff, lp, sizeof(struct LocalePrefs)) == sizeof(struct LocalePrefs))
 145                             {
 146                                 locale = AllocMem(sizeof(struct IntLocale), MEMF_CLEAR|MEMF_PUBLIC);
 147                                 DEBUG_OPENLOCALE(dprintf("OpenLocale: locale 0x%lx\n",locale));
 148                                 if(locale)
 149                                 {
 150                                     InitLocale(name, locale, lp, LocaleBase);
 151                                     break;
 152                                 }
 153                                 else
 154                                     SetIoErr(ERROR_NO_FREE_STORE);
 155                             }
 156                         }
 157                     } /* from a stop chunk */
 158                     else if(error != IFFERR_EOC)
 159                         break;
 160
 161                 } /* while(1) */
 162             } /* StopChunk() */
 163
 164             CloseIFF(iff);
 165         }
 166         Close((BPTR)iff->iff_Stream);
 167         FreeIFF(iff);
 168         FreeMem(lp, sizeof(struct LocalePrefs));
 169     }
 170     else
 171     {
 172         /* Return the current default */
 173
 174         DEBUG_OPENLOCALE(dprintf("OpenLocale: LocaleLock 0x%lx\n",&IntLB(LocaleBase)->lb_LocaleLock));
 175
 176         ObtainSemaphore(&IntLB(LocaleBase)->lb_LocaleLock);
 177         locale = IntLB(LocaleBase)->lb_CurrentLocale;
 178         locale->il_Count++;
 179         ReleaseSemaphore(&IntLB(LocaleBase)->lb_LocaleLock);
 180     }
 181
 182     DEBUG_OPENLOCALE(dprintf("OpenLocale: Locale 0x%lx\n",locale));
 183     /* We let the optimiser do some CSE above */
 184     return (struct Locale *)locale;
 185
 186     AROS_LIBFUNC_EXIT
 187 } /* OpenLocale */