(hopefully) cross-platform directory functions

diff --git a/src/app/io.cpp b/src/app/io.cpp
new file mode 100644 (file)
index 0000000..7996be6
--- /dev/null
+++ b/src/app/io.cpp
@@ -0,0 +1,75 @@
+#include "io.hpp"
+
+#include <cerrno>
+#ifdef _WIN32
+#  include <direct.h>
+#endif
+#include <sys/stat.h>
+
+
+namespace blank {
+
+bool is_dir(const char *path) {
+#ifdef _WIN32
+       struct _stat info;
+       if (_stat(path, &info) != 0) {
+               return false;
+       }
+       return (info.st_mode & _S_IFDIR) != 0;
+#else
+       struct stat info;
+       if (stat(path, &info) != 0) {
+               return false;
+       }
+       return (info.st_mode & S_IFDIR) != 0;
+#endif
+}
+
+
+bool make_dir(const char *path) {
+#ifdef _WIN32
+       int ret = _mkdir(path);
+#else
+       int ret = mkdir(path, 0777);
+#endif
+       return ret == 0;
+}
+
+
+bool make_dirs(const std::string &path) {
+       if (make_dir(path.c_str())) {
+               return true;
+       }
+
+       switch (errno) {
+
+               case ENOENT:
+                       // missing component
+                       {
+#ifdef _WIN32
+                               auto pos = path.find_last_of("\\/");
+#else
+                               auto pos = path.find_last_of('/');
+#endif
+                               if (pos == std::string::npos) {
+                                       return false;
+                               }
+                               if (!make_dirs(path.substr(0, pos))) {
+                                       return false;
+                               }
+                       }
+                       // try again
+                       return make_dir(path.c_str());
+
+               case EEXIST:
+                       // something's there, check if it's a dir and we're good
+                       return is_dir(path.c_str());
+
+               default:
+                       // whatever else went wrong, it can't be good
+                       return false;
+
+       }
+}
+
+}

diff --git a/src/app/io.hpp b/src/app/io.hpp
new file mode 100644 (file)
index 0000000..4869238
--- /dev/null
+++ b/src/app/io.hpp
@@ -0,0 +1,22 @@
+#ifndef BLANK_APP_IO_HPP_
+#define BLANK_APP_IO_HPP_
+
+#include <string>
+
+
+namespace blank {
+
+/// check if give path points to an existing directory
+bool is_dir(const char *);
+
+/// create given directory
+/// @return true if the directory was created
+///         the directory might already exist, see errno
+bool make_dir(const char *);
+/// create given directory and all parents
+/// @return true if the directory was created or already exists
+bool make_dirs(const std::string &);
+
+}
+
+#endif