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From: katsu@sra.co.jp (WATANABE Katsuhiro)
Newsgroups: comp.unix.questions
Subject: Re: how to use scandir()?
Message-ID: <KATSU.90Aug28105457@sran14.sra.co.jp>
Date: 28 Aug 90 01:54:57 GMT
References: <9008271747.AA02292@ws-38.cae.wisc.edu>
Sender: news@sran124.sra.co.jp
Organization: Software Research Associates, Inc.,Japan
Lines: 46
In-reply-to: wyuen@CAE.WISC.EDU's message of 27 Aug 90 17:47:30 GMT

# Sorry for my poor English.

In article <9008271747.AA02292@ws-38.cae.wisc.edu> wyuen@CAE.WISC.EDU writes:

> Could someone give examples of how to use scandir?

> struct direct *(*namelist[]);       is a reasonable declaration,
> n = scandir(".", namelist, NULL, NULL)        is a reasonable call,

  It's a `illegal pointer probrem'. The 2nd argument of scandir() must
be the address in which you want scandir() to set the address of name list.
  Indeed TYPE of each identifiers are surely reasonable in your program.
But `namelist' is uninitialized and it holds nonsense address and its VALUE
is not reasonable.

  Anyway, my example:

#include <sys/types.h>
#include <sys/dir.h>

main(argc, argv)
int argc;
char **argv;
{
        int i, n;
        struct direct **namelist;

        if ((n = scandir(".", &namelist, NULL, NULL)) < 0) {
                perror(argv[0]);
                exit(1);
        }
        for (i = 0; i < n; i++)
                printf("filename = %s\n", namelist[i]->d_name);
        
/* example of free-ing */
        for (i = 0; i < n; i++) {
                free(namelist[i]->d_name);
        }
        free(namelist);

        exit(0);
}

----____----____
WATANABE Katsuhiro      Software Research Associates, Inc. Japan.
Not execute, but evaluate.