How to list files in a directory in a C program

Question

I m trying to write an ftp server on Linux  In this matter how can I list files in the directory on terminal by a C program  Maybe I can use exec function to run find command but I want file name as a string to send client program  How can I do this   Thanks for answers

User · Answer

One tiny addition to JB Jansen s answer - in the main readdir   loop I d add this     if  dir- gt d type    DT REG           printf   s n   dir- gt d name         Just checking if it s really file  not  sym link  directory  or whatever   NOTE  more about struct dirent in libc documentation

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Below code will only print files within directory and exclude directories within given directory while traversing       include  lt dirent h gt   include  lt stdio h gt   include  lt errno h gt   include  lt sys stat h gt   include lt string h gt  int main void        DIR  d      struct dirent  dir      char path 1000    home joy Downloads       d   opendir path       char full path 1000       if  d                while   dir   readdir d      NULL                          Condition to check regular file              if dir- gt d type  DT REG                   full path 0    0                   strcat full path path                   strcat full path                       strcat full path dir- gt d name                   printf   s n  full path                                   closedir d             return 0

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An example  available for POSIX compliant systems          This program displays the names of all files in the current directory        include  lt dirent h gt    include  lt stdio h gt    int main void      DIR  d    struct dirent  dir    d   opendir         if  d        while   dir   readdir d      NULL          printf   s n   dir- gt d name             closedir d         return 0       Beware that such an operation is platform dependant in C   Source   http   faq cprogramming com cgi-bin smartfaq cgi answer 1046380353 amp id 1044780608

User · Answer

Here is a complete program how to recursively list folder s contents    include  lt dirent h gt    include  lt stdio h gt    include  lt string h gt    define NORMAL COLOR    x1B 0m   define GREEN    x1B 32m   define BLUE    x1B 34m        let us make a recursive function to print the content of a given folder     void show dir content char   path      DIR   d   opendir path      open the path   if d  NULL  return     if was not able return   struct dirent   dir     for the directory entries   while   dir   readdir d      NULL     if we were able to read somehting from the directory             if dir- gt  d type    DT DIR     if the type is not directory just print it with blue         printf   s s n  BLUE  dir- gt d name         else       if dir - gt  d type    DT DIR  amp  amp  strcmp dir- gt d name       0  amp  amp  strcmp dir- gt d name        0      if it is a directory                 printf   s s n  GREEN  dir- gt d name      print its name in green         char d path 255      here I am using sprintf which is safer than strcat         sprintf d path    s  s   path  dir- gt d name           show dir content d path      recall with the new path                   closedir d      finally close the directory    int main int argc  char   argv       printf   s n   NORMAL COLOR        show dir content argv 1       printf   s n   NORMAL COLOR     return 0

[c] How to list files in a directory in a C program?

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