c_mkpath.c.1

/*
   Recursive mkdir 

   Source:

      https://gist.github.com/JonathonReinhart/8c0d90191c38af2dcadb102c4e202950
*/


#include <string.h>
//#include <limits.h>     // PATH_MAX ? where is it ? or _POSIX_PATH_MAX ?
#include <linux/limits.h> 

// #include <linux/limits.h> 
// -->   /usr/include/linux/limits.h
//       -->   PATH_MAX = 4096


// #include <limits.h> 
//#ifdef	__USE_POSIX
//# include <bits/posix1_lim.h>
//#endif

// --> /usr/include/limits.h -> 
//    -->   /usr/include/x86_64-linux-gnu/bits/posix1_lim.h
// Number of bytes in a pathname.  
// #define   _POSIX_PATH_MAX      256



#include <sys/stat.h>   // mkdir(2)   
#include <errno.h>

int c_mkpath ( const char *path, mode_t mode )
{
   // Adapted from http:https://stackoverflow.com/a/2336245/119527   

   const size_t len = strlen ( path );
   char path_trim [ PATH_MAX ] ;
   char *p ; 

   errno = 0 ;

   // Copy string so its mutable   

   if ( len > sizeof(path_trim) - 1 ) 
   {
      errno = ENAMETOOLONG;
      return -1; 
   }   

   strcpy ( path_trim, path ) ;

   // Iterate the string   

   for ( p = path_trim + 1; *p; p++ ) 
   {
      if ( *p == '/' ) 
      {
         // Temporarily truncate   

         *p = '\0';

         if ( mkdir( path_trim, mode ) != 0) 
         {
            if (errno != EEXIST) return -1 ; 
         }

         *p = '/';
      }
   }   

   if ( mkdir ( path_trim, mode ) != 0 ) 
   {
      if ( errno != EEXIST ) return -1 ; 
   }   

   return 0;
}