Diff: Challenge2_simple/mbed/error.h

Revision:

0:51b2096d0077

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Challenge2_simple/mbed/error.h	Wed Oct 24 08:14:56 2012 +0000
@@ -0,0 +1,60 @@
+/* mbed Microcontroller Library - error
+ * Copyright (c) 2006-2009 ARM Limited. All rights reserved.
+ */ 
+ 
+#ifndef MBED_ERROR_H
+#define MBED_ERROR_H
+
+/* Reporting Compile-Time Errors:
+ *  To generate a fatal compile-time error, you can use the pre-processor #error directive.
+ *
+ * > #error "That shouldn't have happened!"
+ *
+ * If the compiler evaluates this line, it will report the error and stop the compile.
+ *
+ * For example, you could use this to check some user-defined compile-time variables:
+ *
+ * > #define NUM_PORTS 7
+ * > #if (NUM_PORTS > 4)
+ * >     #error "NUM_PORTS must be less than 4"
+ * > #endif
+ *
+ * Reporting Run-Time Errors:
+ * To generate a fatal run-time error, you can use the mbed error() function.
+ *
+ * > error("That shouldn't have happened!");
+ *
+ * If the mbed running the program executes this function, it will print the 
+ * message via the USB serial port, and then die with the blue lights of death!
+ *
+ * The message can use printf-style formatting, so you can report variables in the 
+ * message too. For example, you could use this to check a run-time condition:
+ * 
+ * > if(x >= 5) {
+ * >     error("expected x to be less than 5, but got %d", x);
+ * > }
+ */
+ 
+#if 0 // for documentation only
+/* Function: error
+ * Report a fatal runtime error
+ *
+ * Outputs the specified error message to stderr so it will appear via the USB 
+ * serial port, and then calls exit(1) to die with the blue lights of death.
+ *
+ * Variables:
+ *  format - printf-style format string, followed by associated variables
+ */
+void error(const char* format, ...);
+#endif  
+
+#include <stdlib.h>
+
+#ifdef NDEBUG
+    #define error(...) (exit(1))
+#else
+    #include <stdio.h>
+    #define error(...) (fprintf(stderr, __VA_ARGS__), exit(1))
+#endif
+
+#endif