nls.c

用C语言实现的DOS操作系统的源代码

/****************************************************************/
/*                                                              */
/*                            nls.c                             */
/*                            DOS-C                             */
/*                                                              */
/*    National Languge Support functions and data structures    */
/*                                                              */
/*                   Copyright (c) 1995, 1996                   */
/*                      Pasquale J. Villani                     */
/*                      All Rights Reserved                     */
/*                                                              */
/*                   Copyright (c) 1995, 1996                   */
/*                         Steffen Kaiser                       */
/*                      All Rights Reserved                     */
/*                                                              */
/* This file is part of DOS-C.                                  */
/*                                                              */
/* DOS-C is free software; you can redistribute it and/or       */
/* modify it under the terms of the GNU General Public License  */
/* as published by the Free Software Foundation; either version */
/* 2, or (at your option) any later version.                    */
/*                                                              */
/* DOS-C is distributed in the hope that it will be useful, but */
/* WITHOUT ANY WARRANTY; without even the implied warranty of   */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See    */
/* the GNU General Public License for more details.             */
/*                                                              */
/* You should have received a copy of the GNU General Public    */
/* License along with DOS-C; see the file COPYING.  If not,     */
/* write to the Free Software Foundation, 675 Mass Ave,         */
/* Cambridge, MA 02139, USA.                                    */
/****************************************************************/

/* $Logfile:   C:/dos-c/src/kernel/nls.c_v  $ */
#ifdef VERSION_STRINGS
static BYTE *RcsId = "$Header:   C:/dos-c/src/kernel/nls.c_v   1.4   04 Jan 1998 23:15:16   patv  $";
#endif

/* $Log:   C:/dos-c/src/kernel/nls.c_v  $
 * 
 *    Rev 1.4   04 Jan 1998 23:15:16   patv
 * Changed Log for strip utility
 * 
 *    Rev 1.3   16 Jan 1997 12:46:54   patv
 * pre-Release 0.92 feature additions
 * 
 *    Rev 1.2   29 May 1996 21:03:46   patv
 * bug fixes for v0.91a
 * 
 *    Rev 1.1   19 Feb 1996  4:34:46   patv
 * Corrected typo
 * 
 *    Rev 1.0   19 Feb 1996  3:21:46   patv
 * Added NLS, int2f and config.sys processing
 */
/* $EndLog$ */

#include "../../hdr/portab.h"
#include "globals.h"

extern UWORD internalUpcase(UWORD c);

#ifndef lint
static char const rcsid[] = 
        "$Id$";
#endif

/* one byte alignment */

#if defined(_MSC_VER) 
    #define asm __asm
    #pragma pack(1)
#elif defined(_QC) || defined(__WATCOM__)
    #pragma pack(1)
#elif defined(__ZTC__)
    #pragma ZTC align 1
#elif defined(__TURBOC__) && (__TURBOC__ > 0x202)
    #pragma option -a-
#endif

struct ctryInfo {       /* Country Information DOS-38 */
        WORD dateFmt;                   /* 0: USA, 1: Europe, 2: Japan */
        char curr[5];                   /* ASCIZ of currency string */
        char thSep[2];                  /* ASCIZ of thousand's separator */
        char point[2];                  /* ASCIZ of decimal point */
        char dateSep[2];                /* ASCIZ of date separator */
        char timeSep[2];                /* ASCIZ of time separator */
        BYTE currFmt;                   /* format of currency:
                                                bit 0: currency string is placed 0: before, 1: behind number
                                                bit 1: currency string and number are separated by a space; 0: No, 1: Yes
                                        */
        BYTE prescision;                /* */
        BYTE timeFmt;                   /* time format: 0: 12 hours; 1: 24 houres */
        VOID (FAR *upCaseFct)(VOID);    /* far call to a function mapping character in register AL */
        char dataSep[2];                /* ASCIZ of separator in data records */
};

struct _VectorTable
{
        VOID FAR *Table;
        BYTE FnCode;
}; 


struct _NlsInfo
{
        struct extCtryInfo
        {
                BYTE reserved[8];
                BYTE countryFname[64];
                WORD sysCodePage;
                WORD nFnEntries;
                struct _VectorTable VectorTable[6];
                
                /* Extended Country Information DOS-65-01 */
                WORD countryCode;               /* current COUNTRY= code */
                WORD codePage;                  /* current code page (CP) */

                struct ctryInfo nlsCtryInfo;
        } nlsExtCtryInfo;

/* characters of Yes/No prompt for DOS-65-23 */
        char yesCharacter;
        char noCharacter;

/* upcased characters for ECS-ASCII > 0x7f for DOS-65-02 */
        WORD upNCsize;                  /* number of entries in the following array */
        char upNormCh[128];

/* upcased characters for ECS-ASCII > 0x7f for file names for DOS-65-04 */
        WORD upFCsize;                  /* number of entries in the following array */
        char upFileCh[128];

/* collating sequence for ECS-ASCII 0..0xff for DOS-65-06 */
        WORD collSize;                  /* number of entries in the following array */
        char collSeq[256];

/* DBC support for DOS-65-07 */
        WORD dbcSize;                   /* number of entries in the following array */
        /* char dbcTable[1024]; no DBC support */
        WORD dbcEndMarker;              /* contains always 0 */

/* in file names permittable characters for DOS-65-05 */
        struct chFileNames {
                WORD fnSize;                    /* size of this structure */
                BYTE dummy1;
                char firstCh, lastCh;   /* first, last permittable character */
                BYTE dummy2;
                char firstExcl, lastExcl;       /* first, last excluded character */
                BYTE dummy3;
                BYTE numSep;            /* number of file name separators */
                char fnSeparators[14];
        } nlsFn;
} nlsInfo
#ifdef INIT_NLS_049
=               /* let's initialize it with values for Germany */
#include "049-437.nls"
#else
=               /* let's initialize it with default values (USA) */
#include "001-437.nls"
#endif
;

#define normalCh nlsInfo.upNormCh
#define fileCh nlsInfo.upFileCh
#define yesChar nlsInfo.yesCharacter
#define noChar nlsInfo.noCharacter

#define PathSep(c) ((c)=='/'||(c)=='\\')
#define DriveChar(c) (((c)>='A'&&(c)<='Z')||((c)>='a'&&(c)<='z'))

/*  COUNTRY.SYS structures */
struct  CpiHeader
{
        BYTE    name[8];                /* signature */
        BYTE    reserved[8];
        WORD    nPointers;              /* size of following array */
        
        struct  
        {
                BYTE    pointerType;    /* always 1 */
                DWORD   offset;         /* offset to data */
        }       pointer[1];
};

struct  CountryRecord
{
        WORD    length;                 /* size of record */
        WORD    country;                /* country code */
        WORD    codePage;               /* code page */
        WORD    reserved[2];
        DWORD   subCountryOffset;       /* offset to data record */
};

struct  CountryTableDescr
{
        WORD    length;         /* size of structure */
        WORD    id;             /* table type id */
        DWORD   offset;         /* offset to table data */
};

/* standard alignment */

#if defined (_MSC_VER) || defined(_QC) || defined(__WATCOMC__)
 #pragma pack()
#elif defined (__ZTC__)
 #pragma ZTC align
#elif defined(__TURBOC__) && (__TURBOC__ > 0x202)
 #pragma option -a.
#endif

 
COUNT NlsFuncInst(VOID)
{
        BYTE cNlsRet;

        asm {
                xor     bx,bx
                mov     ax,1400h
                int     2Fh
                mov     cNlsRet,al
        }

        /* Return the al register as sign extended:                     */
        /*               0 == not installed, ok to install              */
        /*               1 == not installed, not ok to install          */
        /*              -1 == installed                                 */
        return cNlsRet;
}

BOOL
GetGlblCodePage(UWORD FAR *ActvCodePage, UWORD FAR *SysCodePage)
{
        *ActvCodePage = nlsInfo.nlsExtCtryInfo.codePage;
        *SysCodePage = nlsInfo.nlsExtCtryInfo.sysCodePage;
        return TRUE;
}


BOOL
SetGlblCodePage(UWORD FAR *ActvCodePage, UWORD FAR *SysCodePage)
{
        nlsInfo.nlsExtCtryInfo.codePage = *ActvCodePage;
        nlsInfo.nlsExtCtryInfo.sysCodePage = *SysCodePage;
        return TRUE;
}


UWORD SetCtryInfo(UBYTE FAR *lpShrtCode, UWORD FAR *lpLongCode,
        BYTE FAR *lpTable, UBYTE *nRetCode)
{
        UWORD CntryCode;
        UBYTE nNlsEntry;
        UWORD uSegTable, uOffTable;
        UBYTE nLclRet;

        /* Get the Country Code according to the DOS silly rules.       */
        if(0xff != *lpShrtCode)
                CntryCode = *lpShrtCode;
        else
                CntryCode = *lpLongCode;

        /* If it's the same country code as what's installed, just      */
        /* return because there's nothing to do.                        */
        if(CntryCode == nlsInfo.nlsExtCtryInfo.countryCode)
        {
                *nRetCode = 0;
                return CntryCode;
        }

        /* Check if nlsfunc is installed                                */
        if(NlsFuncInst() >= 0)
        {
                *nRetCode = 0xff;
                return 0xffff;
        }

        /* Get the country information from nlsfunc                     */
        uSegTable = FP_SEG(lpTable);
        uOffTable = FP_OFF(lpTable);

        asm {
                push    ds
                mov     bx,CntryCode