misc: Add `is_dir()`, and `mkdirp()`

`is_dir()` checks if the supplied path is a directory, and returns 1 if
it's a directory, 0 if it isn't a directory, and -1 if it doesn't exist.

`mkdirp()` works like `mkdir()` except that it also creates parent
directories if needed.

1 files changed, 2 insertions, 0 deletions

diff --git a/misc.h b/misc.h
index 0ad5fba..3a653e2 100644
--- a/misc.h
+++ b/misc.h
@@ -17,4 +17,6 @@ extern char *create_num_str(const char *str, int num);
 extern int is_empty(const char *str);
 extern char *skip_whitespace(const char *str);
 extern int format_len(const char *fmt, ...);
+extern int is_dir(const char *path);
+extern void mkdirp(const char *path, int mode);
 #endif