Added ERROR() and WARNING() for debugging.

testing/misc_tools.h

@@ -26,9 +26,40 @@
 
 unsigned char * hex_string_to_bin(char hex_string[]);
 
+/* WARNING(msg) takes a printf()-styled string and prints it
+ * with some additional details.
+ * ERROR(exit_status, msg) does the same thing as WARNING(), but
+ * also exits the program with the given exit status.
+ * Examples:
+ * WARNING("<insert warning message here>");
+ * int exit_status = 2;
+ * ERROR(exit_status, "exiting with status %i", exit_status);
+ */
+#ifdef DEBUG
+    #include <assert.h>
+    #include <stdio.h>
+    #include <string.h>
 
+    #define DEBUG_PRINT(str, ...) do { \
+        char msg[1000]; \
+        sprintf(msg, "%s(): line %d (file %s): %s%%c\n", __FUNCTION__, __LINE__, __FILE__, str); \
+        fprintf(stderr, msg, __VA_ARGS__); \
+    } while (0)
 
+    #define WARNING(...) do { \
+        fprintf(stderr, "warning in "); \
+        DEBUG_PRINT(__VA_ARGS__, ' '); \
+    } while (0)
 
+    #define ERROR(exit_status, ...) do { \
+        fprintf(stderr, "error in "); \
+        DEBUG_PRINT(__VA_ARGS__, ' '); \
+        exit(exit_status); \
+    } while (0)
+#else
+    #define WARNING(...)
+    #define ERROR(...)
+#endif // DEBUG
 
 /************************Linked List***********************
  * This is a simple linked list implementation, very similar