Error in C program

[abhijangda]

Hello friends, I am creating C program that will list all the files in the directory specified with their paths. So code is here.

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<dirent.h>
#include<sys/stat.h>

void declevel(char str[])
{
    int count=0;
    int i=0,j=0;
    
    for (i=0;i<strlen(str);i++)
    {
        if (str[i] == '/')
        {
            count++;
            }
        }
    
    int arr[count];
    
    for (i=0;i<strlen(str);i++)
    {
        if (str[i] == '/')
        {
            arr[j] = i;
            j++;
            }
        }
    str[arr[count-1]] = '\0'; 
    printf("%s",str);      
    }    

void getdirstruct(char dir[])
{
    DIR *dp;
    struct dirent *entry;
    struct  stat statbuf;
    char path[1000], path2[1000];
    int s;
    if ((dp = opendir(dir)) == NULL)
    {
        return;
        }
    
    chdir(dir);
    strcat(path,dir);
    
    while ((entry = readdir(dp)) != NULL)
    {
        lstat(entry->d_name,&statbuf);
        if (S_ISDIR(statbuf.st_mode))
        {
            if (strcmp(".",entry->d_name) == 0 || strcmp(".", entry->d_name) == 0)
            {
                s = sprintf(path2,"%s",path);
                declevel(path2); /*directory level decreases*/
                continue;
                }
            getdirstruct(entry->d_name);
            strcat(path,entry->d_name);
            }
        }
    chdir(".");
    closedir(dp);
        }

void main()
{
    getdirstruct("/home");
    }

Here declevel is a function (or more specifically procedure) that will decrease the path string with level 1. I mean if path string is /media/sda1/downloads then after calling declevel this path string will be /media/sda1. It runs very well when I run it independently in another program. But here I am getting error. Compiler (gcc) compiles it without error, but when I run it in terminal I got error segmentation fault (core dumped). Please help me friends.!!!

[nims11]

i don't have much knowledge about file handling but i tested it and found that the segmentation fault was being caused because

str[arr[count-1]] = '\0';

in decleval(). when .config is passed to decleval(), count is zero and str[arr[-1]] causes segmentation fault.
i think there is some problem in

if (strcmp(".",entry->d_name) == 0 || strcmp(".", entry->d_name) == 0)

you might have missed something here. also you have same statements in both sides of "||"!!
can you please explain to me why you added this "if" condition(don't know much about advanced file handling, so just curious!)?

[abhijangda]

Originally Posted by nims11

i don't have much knowledge about file handling but i tested it and found that the segmentation fault was being caused because

str[arr[count-1]] = '\0';

in decleval(). when .config is passed to decleval(), count is zero and str[arr[-1]] causes segmentation fault.
i think there is some problem in

if (strcmp(".",entry->d_name) == 0 || strcmp(".", entry->d_name) == 0)

you might have missed something here. also you have same statements in both sides of "||"!!
can you please explain to me why you added this "if" condition(don't know much about advanced file handling, so just curious!)?

oh, sorry for if statement, I corrected it just after creating thread here. the correct one is

if (strcmp(".",entry->d_name) == 0 || strcmp("..", entry->d_name) == 0)

But I cannot understand what you want to say about declevel(). What is this .config. Also count can never be zero, as I am working on Fedora 14, so path(which passed to declevel) will always contain atleas one '/'.

[nims11]

there seems to be some logical problem in the program.
when i replaced

s = sprintf(path2,"%s",path);
declevel(path2); /*directory level decreases*/
continue;

with

printf("path2-%s\n",path2);
declevel(path2); /*directory level decreases*/
printf("path2-%s\n",path2);
continue;

the output was

dname-.
path2-/home
path2-
dname-..
path2-/home
path2-
dname-nims11
dname-.adobe
dname-.
path2-.adobe
Segmentation fault