segment fault while Checking if directory exist or not

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i used this code but it gives me segment fault ?

C#

char* path;

scanf("%20[^\r]",path);
DIR* dir = opendir(path);
if (dir)
{
printf("Directory Exists");
closedir(dir);
}
else if (ENOENT == errno)
{
printf("Directory Exist");
}
else
{
printf("Directory not Exist");
}

Posted 6-Feb-13 6:25am

FatimaAsif

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FatimaAsif 6-Feb-13 12:28pm

i give this input
/home/fatima/Desktop/child

2 solutions

Solution 2

path must be a buffer, not a char pointer. Where should scanf deposite string being read? For example

C++

char path[100];
scanf ("%20[^\r]", path);

Posted 6-Feb-13 6:44am

nv3

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Jochen Arndt · Accepted Answer · 2013-02-06T06:36:00

Solution 1

Your path variable is just a pointer to char. But you must provide the space to store the scanned string including the terminating NULL char:

C++

char path[21];

Posted 6-Feb-13 6:36am

Jochen Arndt

Comments

FatimaAsif 6-Feb-13 12:48pm

ok it works thanks for your help.

Jochen Arndt 6-Feb-13 12:52pm

Thank you for your feedback. You may 'Accept' the answer using the so named link to mark it as solved.

FatimaAsif 6-Feb-13 12:55pm

that problem is solved bt another problem is that it only returns Directory exist, how can i solved it , can u please help me?

Jochen Arndt 6-Feb-13 13:00pm

That's another problem. But the answer is easy. Take a close look on your code:
else if (ENOENT == errno)
{
printf("Directory Exist");
}
You are printing "Directory Exist" when it does not exist.

FatimaAsif 6-Feb-13 14:15pm

but if exist or not it gives the same output

Jochen Arndt 7-Feb-13 1:58am

I hope you have seen it meanwhile. The servers where very busy, so that I could not answer. Change your code to:
else if (ENOENT == errno)
{
printf("Directory does not exist");
}
else
{
printf("Not a directory or other error");
}