#List directory contents using scandir c how to
#List directory contents using scandir c code

#include './config.h' #include #include #include #include /* If you donвЂ™t want a filter instead of passing in the function you can simply set the argument to NULL. There is more on the the dirent structure later. With filtering it allows us to easy skip over files we donвЂ™t want returned. The filtering logic would typically be done on the name of the file which is found in the dirent.d_name structure member.

#List directory contents using scandir c code

C code to List files in DirectoryД«elow is a simple example, mainly taken from man scandir, with the execption of adding filtering logic. Again, see man 3 scandir for all the details. The glibc library provides alphasort and versionsort for this. The compar function will control how the file listing is done. The filter function is optional but will filter out files from namelist based on user specified criteria.

The namelist will be populated from all the files in the directory. Int ( *compar)( const struct dirent **, const struct dirent **)) Int scandir( const char *dirp, struct dirent ***namelist, Here is the function signature for scandir. There is also a scandirat function that allows us to pass in a file descriptor instead of a directory name in a char*. To list files in a directory we will use the scandir function from dirent.h. gitignore RECORD LENGTH: 32 TYPE: regular NAME: Makefile RECORD LENGTH: 32 TYPE: regular NAME: Makefile.am RECORD LENGTH: 32 TYPE: regular NAME: Makefile.in RECORD LENGTH: 32 TYPE: regular NAME: README RECORD LENGTH: 32 TYPE: regular NAME: aclocal.m4 RECORD LENGTH: 32 TYPE: regular NAME: autogen.sh RECORD LENGTH: 32 TYPE: regular

NAME: autom4te.cache RECORD LENGTH: 40 TYPE: directory NAME: autoscan.log RECORD LENGTH: 32 TYPE: regular NAME: cdirlist-1.0.tar.gz RECORD LENGTH: 40 TYPE: regular NAME: compile RECORD LENGTH: 32 TYPE: regular NAME: config.h RECORD LENGTH: 32 TYPE: regular NAME: config.h.in RECORD LENGTH: 32 TYPE: regular NAME: config.log RECORD LENGTH: 32 TYPE: regular NAME: config.status RECORD LENGTH: 40 TYPE: regular NAME: configure RECORD LENGTH: 32 TYPE: regular NAME: configure.ac RECORD LENGTH: 32 TYPE: regular

NAME: configure.scan RECORD LENGTH: 40 TYPE: regular NAME: depcomp RECORD LENGTH: 32 TYPE: regular NAME: install-sh RECORD LENGTH: 32 TYPE: regular

NAME: missing RECORD LENGTH: 32 TYPE: regular NAME: src RECORD LENGTH: 24 TYPE: directory NAME: stamp-h1 RECORD LENGTH: 32 TYPE: regular NAME: test-driver RECORD LENGTH: 32 TYPE: regular For each file the program finds it will print the name of file, the record length and the type. The name of the binary is called cdirlist and it takes an argument for the directory to list we just give it. The example is showing a number of regular files an directories in an autotools project. This is a good use case since it shows both files and directories. I will just specify the source directory from which the example was built to show how it works. To run the example we must specify the name of the directory to list.

#List directory contents using scandir c how to

WeвЂ™ll make an example in C that shows how to list all the files in a directory and give the name and type of each file in the directory. There are default options to list alphabetically through the alphasort() glibc standard function. The scandir function allows for sorting, comparing and filtering the names of files in the directory. Use the glibc scandir function from to list all the files in a directory using the C programming language.