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From: george@hls0.hls.oz (George Turczynski)
Newsgroups: comp.unix.questions
Subject: Re: how to use scandir()?
Summary: Not reasonable...
Message-ID: <857@hls0.hls.oz>
Date: 31 Aug 90 06:32:17 GMT
References: <9008271747.AA02292@ws-38.cae.wisc.edu>
Lines: 64

In article <9008271747.AA02292@ws-38.cae.wisc.edu>, wyuen@CAE.WISC.EDU writes:
> 
> Could someone give examples of how to use scandir?
> Eg., how to list the filenames of a given directory?
> 
> It seems to me that
> 
> struct direct *(*namelist[]);       is a reasonable declaration,

try:	struct direct **namelist;

> n = scandir(".", namelist, NULL, NULL)        is a reasonable call,

try:	n= scandir(".",&namelist,NULL,NULL);

> for (i=0; i<n; i++)
>      printf("filename = %s\n", (*namelist[i])->d_name);   is a reasonable use,

try:	for( i= 0; i < n; i++ )
			printf("filename= %s\n",namelist[i]->d_name);

> however, I'm getting Segmentation Faults all the time.
> Someone kindly points out what I did wrong?
> 
> Thanks. Please send to newsgroup as my email is unstable.

Perhaps you couldn't make sense of the manual entry ?  I assume you
_did_ read it, no ?  You give it the address of a struct direct ** and
it malloc()s the space for the pointer table and the structures, then
"fills in" the struct direct ** ("namelist" here) with a pointer to
the pointer table.  You then use the pointer table to get to the
struct directs.

Here is the example you asked for:

/*-----------------Cut here--------------------*/
#include<stdio.h>
#include<sys/types.h>
#include<sys/dir.h>

struct direct **namelist;

main()
{
        int i, n;

        n= scandir(".",&namelist,NULL,NULL);

        for( i= 0; i < n; i++ )
                printf("filename= %s\n",namelist[i]->d_name);
}

/*-----------------Cut here--------------------*/

Hope this clears up any problems,

and have a nice day...

-- 
| George P. J. Turczynski.          |---------------------------------------------------- 
| Computer Systems Engineer.        | ACSnet: george@highland.oz | I can't speak for the |
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