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Re: C stuff




Wooo, it's not as easy as in perl; essentially it is: open a directory 
(realy a file), read the first entry into a structure, read the structure.

Here's a catch: reading the dir only gives one entry, for the next entry, 
read it again (goes to next automatically).  Another catch: the list is 
not alpha-numeric sorted (the order in which files are added (ever 
noticed this in DOS?)).

I included a short project at the bottom I did a while back-- it reads a 
directory (the current) and outputs it to an HTML file; but you'll get the idea.  It 
doesn't show hidden files (it could very easily), nor files without read 
permission (This was part of a webserver for a CS class).

Hope you can make it out-- if you knock out the html stuff, it'll clear 
it up quite a bit.

Mike

On Sun, 29 Mar 1998, Bill Dunn wrote:

> 
> 
> 	What would be the equivalent in ANSI C or C++ to the following PERL line:
> 
> 	$input = `ls -l /home/httpd/html`;
> 
> 	I've tried:
>  
>  	input[1000] = system("ls -l /home/httpd/html");
> 
> 	but it actually sends the output to the screen instead of the assigning
> 	the directory listing to the variable. And I've tried several data types
> 	for input to no avail.
> 
> 	Basically, all I need to do is get a list of the files in a directory
> 	and assign them to an array so I can use them one at a time.
> 
> 	Thanks.
> 
> 
> 	Bill Dunn
> 
> --
> To unsubscribe, send email to majordomo@silug.org with
> "unsubscribe silug-discuss" in the body.
> 
> 

----- starts here -----

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <sys/param.h>
#include <dirent.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>


void main()
{

struct dirent *dirent_struct_ptr; /* struct for readdir */
struct group *grp_struct_ptr;  /*struct for getgrgid */
struct passwd *pwd_struct_ptr; /*struct for getpwuid */
struct stat *stat_struct_ptr; /* struct for stat */
struct tm *time_struct_ptr; /*struct for localtime */
FILE * fp;
DIR * dp;  /* for opendir */
char *path_ptr, *time_string_ptr; /* for getcwd */
time_t cal_time;
uid_t uids, gids;
uid_t i=15;
int j=0;
uid_t getuid(void);
char temp[MAXPATHLEN+1];
char slash[]="/";


/* S_IREAD S_IWRITE S_IEXEC */


tzset();
uids=getuid();



if ((stat_struct_ptr=(struct stat *) malloc(sizeof(stat))) != NULL)

  if ((path_ptr=getcwd(NULL,MAXPATHLEN+1)) != NULL)
  
  if ((dp=opendir(path_ptr)) != NULL)
   {
   printf("\n<html>\n<head>\n<title>Mike Connor's 
phase2.c</title>\n</head>\n");
   printf("<body>");
   printf("<table>");
   printf("<tr><td>file name </td><td> size </td><td> owners name 
</td><td> grou
p's name </td><td> last accessed </td><td> last modified </td></tr>");

   while((dirent_struct_ptr=readdir(dp)) != NULL)
   { 
   if (((*dirent_struct_ptr).d_ino !=0) && (*(*dirent_struct_ptr).d_name 
!= '.')
)
     {
     strcpy(temp, path_ptr);
     strcat(temp, slash);
     strcat(temp, (*dirent_struct_ptr).d_name);

     if ((stat(temp, stat_struct_ptr) != -1))
     
       if  ((*(*dirent_struct_ptr).d_name) != '.')       
       { 

       printf("<tr><td>");

       if ( (((*stat_struct_ptr).st_mode & S_IREAD) && (uids == 
(*stat_struct_pt
r).st_uid)) || ((*stat_struct_ptr).st_mode & S_IREAD>>3) || 
((*stat_struct_ptr).
st_mode & S_IREAD>>6))
          printf("<a href=\"%s\"> %s </a> ",  
(*dirent_struct_ptr).d_name, (*dir
ent_struct_ptr).d_name);

       else
          printf(" %s ", (*dirent_struct_ptr).d_name);

       printf("</td><td>");
       printf(" %u ", (*stat_struct_ptr).st_size);
       printf("</td><td>");

       pwd_struct_ptr=getpwuid((*stat_struct_ptr).st_uid);
       printf(" %s ", (*pwd_struct_ptr).pw_name);
       free(pwd_struct_ptr);

       printf("</td><td>");

       grp_struct_ptr=getgrgid((*stat_struct_ptr).st_gid);
       printf(" %s ", (*grp_struct_ptr).gr_name);
       free(grp_struct_ptr);

       printf("</td><td>");

       time_struct_ptr=localtime(&(*stat_struct_ptr).st_atime);
       printf(" %s ", asctime(time_struct_ptr));
       
       printf("</td><td>");

       time_struct_ptr=localtime(&(*stat_struct_ptr).st_mtime);
       printf(" %s ", asctime(time_struct_ptr));
       free(time_struct_ptr);

       printf("</td></tr>"); 
       } 
      
     }
   } /*while end*/

printf("</table>");
printf("</body></html>\n");


} /* if ends */

}/*prog end*/


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