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#1
03-26-2008
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opendir() + customly created directories
Gday all
In a program I am designing, I am using opendir() to test whether entries under a certain directory are sub-directories or not. This method works fine for the directory itself (.) and the parent directory (..), however it does not work for any sub-directories I manually create. i.e. it does not work for current_directory/my_sub_directory I am performing the test in the following manner Code:
if( (sub_dir = opendir(sub_dir_name)) != NULL)
{
/* Do whatever*/
}
regards James 
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#2
03-26-2008
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One trap I always keep falling into is forgetting to glue back the entry from a readdir to the directory I read it from, i.e. using a relative file name in the wrong (e.g. grandparent) directory.
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#3
03-26-2008
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Quote:
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#4
03-26-2008
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Doubly linked lists..yay.
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#5
03-26-2008
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hey all
Ive discovered a better way to test for the presence of sub-directories within folders, however it does not involve the use of opendir() What I did instead was the following Code:
/*Check if it is current or parent directory*/
if( (strcmp(subfolder_name,".") != 0) && (strcmp(subfolder_name,"..") != 0)
{
/*Check to see if it is a directory by using strrchr()*/
ptr = strrchr(subfolder_name,'.');
/*If strrchr() returns NULL, the current entry
is indeed a sub-folder*/
if(ptr == NULL)
{
/*Do necessary stuff here*/
}
}
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#6
03-26-2008
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opendir() returns a pointer to a dir stream. readdir() is invoked in a loop afterwards to read the contents of the opened dir stream. Each dir entry is passed from readdir() to stat() which stores information in a stat structure. The S_ISDIR() macro can be used to test whether the stat structure is a dir or not. Look at the manpages of opendir() readdir() and stat().
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