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From: des@uucsbb.UUCP (Don Shope)
Newsgroups: comp.sys.att,comp.sys.misc
Subject: Re: Seeking a method to "read" a DOS directory
Summary: Microsoft C 5.0 code included
Message-ID: <285@uucsbb.UUCP>
Date: 31 Mar 88 16:55:55 GMT
References: <902@cblpe.ATT.COM> <1001@mcgill-vision.UUCP>
Reply-To: des@uucsbb.Blue Bell.UNISYS.COM (Don Shope)
Organization: Unisys Unix Support Services, Blue Bell, PA
Lines: 63

In article <902@cblpe.ATT.COM>, jrm@cblpe.ATT.COM (John Miller) writes:
> I would like obtain a list of files that are in a DOS directory using
> Microsoft 'C', version 4 or 5.
>
> The best method I know of so far [...] is to use a DOS interrupt
> function to gain information about the FAT.  [and then read the disk
> to find the directory]
>

Following is a little program I wrote to illustrate the use of
two new functions in level 5.0 of the Microsoft C compiler:

/*  Directory functions. The second argument to _dos_findfirst()
 *  specifies the necessary attributes needed for a file to be
 *  selected (whose name also matches the pattern). Values
 *  for attribute are: _A_NORMAL, _A_RDONLY, _A_HIDDEN, _A_SYSTEM,
 *  _A_VOLID, _A_SUBDIR, _A_ARCH (which can be or'd together). 
 *  Return value is 0 upon success, errno is set on failure to ENOENT.
 *
 *  Following is the function prototype and struct definition:
 *
 *  unsigned _dos_findfirst(path,attributes,buffer);
 *  unsigned _dos_findnext(buffer);
 *  char *path;               - target filename (* and ? allowed)  
 *  unsigned attributes;      - target attributes  
 *  struct find_t { 
 *        char reserved[21];  - reserved for use by MS-DOS  
 *        char attrib;        - attribute byte for matched path  
 *        unsigned wr_time;   - Time of last write to file  
 *        unsigned wr_date;   - Date of last write to file  
 *        long size;          - Length of file in bytes  
 *        char name[13];      - filename/directory name  
 *        } *buffer;
 */

#include <dos.h>
main(argc, argv)
int argc;
char *argv[];
{
   struct find_t dosfile;
   char pattern[81];

   if( argc != 2 ) {
      printf( "Enter DOS search pattern: " );
      scanf( "%s", pattern );
      }
   else
      strcpy( pattern, argv[1] );

   printf( "Directory listing of '%s':\n\n", pattern );

   if( _dos_findfirst( pattern, _A_NORMAL, &dosfile ) == 0 ) {
      printf( "Size: %6ld       File: %s\n", dosfile.size, dosfile.name );
      while( _dos_findnext( &dosfile ) == 0 )
         printf( "Size: %6ld       File: %s\n", dosfile.size, dosfile.name );
      }
   else
      printf( "Pattern '%s' not found.\n", pattern );
}

I hope this helps you out. Also, I am a new user, and I hope I have
done things correctly in this posting.