newstuff.c

DOS操作系统的C语言源代码 强烈推荐！！！ 可以用来学习基于字符界面的操作系统的设计

/****************************************************************/
/*                                                              */
/*                           newstuff.c                         */
/*                            DOS-C                             */
/*                                                              */
/*                       Copyright (c) 1996                     */
/*                          Svante Frey                         */
/*                      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/newstuff.c_v  $ */
#ifdef VERSION_STRINGS
static BYTE *mainRcsId = "$Header:   C:/dos-c/src/kernel/newstuff.c_v   1.3   04 Jan 1998 23:15:22   patv  $";
#endif

/* $Log:   C:/dos-c/src/kernel/newstuff.c_v  $
 * 
 *    Rev 1.3   04 Jan 1998 23:15:22   patv
 * Changed Log for strip utility
 * 
 *    Rev 1.2   04 Jan 1998 17:26:14   patv
 * Corrected subdirectory bug
 * 
 *    Rev 1.1   22 Jan 1997 13:21:22   patv
 * pre-0.92 Svante Frey bug fixes.
 */
/* $EndLog$ */


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

int SetJFTSize(UWORD nHandles)
{
        UWORD block, maxBlock;
        psp FAR *ppsp = MK_FP(cu_psp, 0);
        UBYTE FAR *newtab;
        COUNT i;
    
        if (nHandles <= ppsp -> ps_maxfiles)
        {
                ppsp -> ps_maxfiles = nHandles;
                return SUCCESS;
        }

        if (nHandles > SFTMAX)
                return DE_TOOMANY;
    
        if((DosMemAlloc((nHandles + 0xf) >> 4, mem_access_mode, &block, &maxBlock)) < 0)
                return DE_NOMEM;
    
        ++block;
        newtab = MK_FP(block, 0);
    
        for (i = 0; i < ppsp -> ps_maxfiles; i++)
                newtab[i] = ppsp -> ps_filetab[i];
    
        for ( ; i < nHandles; i++)
                newtab[i] = 0xff;
    
        ppsp -> ps_maxfiles = nHandles;
        ppsp -> ps_filetab = newtab;
    
        return SUCCESS;
}

int DosMkTmp(BYTE FAR *pathname, UWORD attr)
{
        /* create filename from current date and time */
        char tokens[16] = "0123456789ABCDEF";
        char FAR *ptmp = pathname;
        BYTE wd, month, day;
        BYTE h, m, s, hund;
        WORD sh;
        WORD year;
        int rc;
        
        while (*ptmp) ptmp++;
        
        if (ptmp == pathname || (ptmp[-1] != '\\' && ptmp[-1] != '/'))
                *ptmp++ = '\\';

        DosGetDate(&wd, &month, &day, (COUNT FAR *)&year);
        DosGetTime(&h, &m, &s, &hund);

        sh = s * 100 + hund;
    
        ptmp[0] = tokens[ year & 0xf ];
        ptmp[1] = tokens[ month ];
        ptmp[2] = tokens[ day & 0xf ];
        ptmp[3] = tokens[ h & 0xf ];
        ptmp[4] = tokens[ m & 0xf ];
        ptmp[5] = tokens[ (sh >> 8) & 0xf ];
        ptmp[6] = tokens[ (sh >> 4) & 0xf ];
        ptmp[7] = tokens[ sh & 0xf ];
        ptmp[8] = '.';                      
        ptmp[9] = 'A';
        ptmp[10] = 'A';
        ptmp[11] = 'A';
        ptmp[12] = 0;

        while ((rc = DosOpen(pathname, 0)) >= 0)
        {
                DosClose(rc);
       
                if (++ptmp[11] > 'Z')
                {
                        if (++ptmp[10] > 'Z')
                        {    
                                if (++ptmp[9] > 'Z')
                                        return DE_TOOMANY;
                        
                                ptmp[10] = 'A';
                        }
                        ptmp[11] = 'A';
                }
        }
        
        if (rc == DE_FILENOTFND) 
        {
                rc = DosCreat(pathname, attr);
        }
        return rc;
}   

int truename(char FAR *src, char FAR *dest)
{
        char buf[128] = "A:\\";
        char *bufp = buf + 3;
        BYTE far *test;

	/* First, adjust the source pointer				*/
	src = adjust_far(src);

        /* Do we have a drive?						*/
        if (src[1] == ':')
        {
                buf[0] = (src[0] | 0x20) + 'A' - 'a';
        
                if (buf[0] >= nblkdev + 'A')
                        return DE_PATHNOTFND;
        
                src += 2; 
        } else 
                buf[0] = default_drive + 'A';
      
        if (*src != '\\' && *src != '/')   /* append current dir */
        {
                DosGetCuDir(buf[0] - '@', bufp);
         
                if (*bufp)
                {
                        while (*bufp) bufp++;
                        *bufp++ = '\\';
                }
        } else src++;

        /* convert all forward slashes to backslashes, and uppercase all characters */
        while(*src)
        {
                char c;

                switch((c = *src++))
                {
                case '/':         /* convert to backslash */
                
                    *bufp++ = '\\';   
                    break;
          
                /* look for '.' and '..' dir entries */
                case '.':         
                    if (bufp[-1] == '\\')
                    {
                        if (*src == '.' && (src[1] == '/' || src[1] == '\\' || !src[1]))
                        {    
                            /* '..' dir entry: rewind bufp to last backslash */
                
                            for (bufp -= 2 ; *bufp != '\\'; bufp--)
                            {
                                if (bufp < buf + 2)    /* '..' illegal in root dir */
                                    return DE_PATHNOTFND;     
                            }
                            bufp++;
                        } else if (*src == '/' || *src == '\\' || *src == 0)     
                        {
                            if (*src != 0) src++;     /* '.' directory: just skip it */          
                        }
                    }
                    else *bufp++ = c;
                    break;

                default:
                    *bufp++ = c;
                    break;
                }
        }
        *bufp++ = 0;
        /* finally, uppercase everything */
        upString(buf);
    
        /* copy to user's buffer */
        fbcopy(buf, dest, bufp - buf);
        return SUCCESS;
}