Task

Create a directory and any missing parents.

This task is named after the posix mkdir -p command, and several libraries which implement the same behavior.

Please implement a function of a single path string (for example ./path/to/dir) which has the above side-effect.
If the directory already exists, return successfully.
Ideally implementations will work equally well cross-platform (on windows, linux, and OS X).

It's likely that your language implements such a function as part of its standard library. If so, please also show how such a function would be implemented.




#include <stdio.h>
#include <stdlib.h>
#include <libgen.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
 
int main (int argc, char **argv) {
    char *str, *s;
    struct stat statBuf;
 
    if (argc != 2) {
        fprintf (stderr, "usage: %s <path>\n", basename (argv[0]));
        exit (1);
    }
    s = argv[1];
    while ((str = strtok (s, "/")) != NULL) {
        if (str != s) {
            str[-1] = '/';
        }
        if (stat (argv[1], &statBuf) == -1) {
            mkdir (argv[1], 0);
        } else {
            if (! S_ISDIR (statBuf.st_mode)) {
                fprintf (stderr, "couldn't create directory %s\n", argv[1]);
                exit (1);
            }
        }
        s = NULL;
    }
    return 0;
}