Initial upload

error.h

@@ -0,0 +1,23 @@
+/* vim: set filetype=c: */
+
+#ifndef _ERROR_H_
+#define _ERROR_H_
+
+#include <stdbool.h>
+#include <stdio.h>
+
+typedef struct Result Result;
+struct Result {
+    bool has_err;
+    char* err_str;
+};
+
+extern Result Result_err(char* err_str);
+extern Result Result_noerr();
+/* err_prefix: string to print before the error, if on occurred; prints nothing if it has value NULL
+ * no_err: string to print if no error occured; prints nothing if it has value NULL
+ * err_file: where to output the string, if an error has occurred
+ * no_err_file: where to output, if no error has occurred */
+extern void Result_print_err_or(const Result obj, const char* err_prefix, const char* no_err, FILE* err_file, FILE* no_err_file);
+
+#endif /* _ERROR_H_ */