1 files changed, 37 insertions, 0 deletions
diff --git a/code/core/fileutils.cpp b/code/core/fileutils.cpp
new file mode 100644
index 0000000..9d080ce
--- /dev/null
+++ b/code/core/fileutils.cpp
@@ -0,0 +1,37 @@
+#include <string.h>
+#include <stdlib.h>
+
+#include "fileutils.h"
+
+// direction is either false=input or true=output and used to overload parameter '-'
+FILE *fd_magic(char *str, bool direction) {
+  static bool usedDir[2] = { false, false };
+
+  // check if stdin/-out is wanted
+  if (strcmp(str, "-") == 0) {
+    // check if we already used this
+    if (usedDir[direction]) {
+      fprintf(stderr, "stdin/-out cannot be used twice\n");
+      exit(-1);
+    }
+
+    // mark that we used it and return in
+    usedDir[direction] = true;
+    return direction ? stdout : stdin;
+  }
+
+  // check if stdout is wanted
+  if (strcmp(str, "0") == 0) {
+    // replace filename and proceed
+    str = "/dev/null";
+  }
+
+  // open file traditionally
+  FILE *fd = fopen(str, direction ? "w" : "r" );
+  if (fd == NULL) {
+    fprintf(stderr, "Failed to open %s\n", str);
+    exit(-1);
+  }
+
+  return fd;
+}