error.h

00001 /* mbed Microcontroller Library - error
00002  * Copyright (c) 2006-2009 ARM Limited. All rights reserved.
00003  * sford
00004  */ 
00005  
00006 #ifndef MBED_ERROR_H
00007 #define MBED_ERROR_H
00008 
00009 /* Reporting Compile-Time Errors:
00010  *  To generate a fatal compile-time error, you can use the pre-processor #error directive.
00011  *
00012  * > #error "That shouldn't have happened!"
00013  *
00014  * If the compiler evaluates this line, it will report the error and stop the compile.
00015  *
00016  * For example, you could use this to check some user-defined compile-time variables:
00017  *
00018  * > #define NUM_PORTS 7
00019  * > #if (NUM_PORTS > 4)
00020  * >     #error "NUM_PORTS must be less than 4"
00021  * > #endif
00022  *
00023  * Reporting Run-Time Errors:
00024  * To generate a fatal run-time error, you can use the mbed error() function.
00025  *
00026  * > error("That shouldn't have happened!");
00027  *
00028  * If the mbed running the program executes this function, it will print the 
00029  * message via the USB serial port, and then die with the blue lights of death!
00030  *
00031  * The message can use printf-style formatting, so you can report variables in the 
00032  * message too. For example, you could use this to check a run-time condition:
00033  * 
00034  * > if(x >= 5) {
00035  * >     error("expected x to be less than 5, but got %d", x);
00036  * > }
00037  */
00038  
00039 #if 0 // for documentation only
00040 /* Function: error
00041  * Report a fatal runtime error
00042  *
00043  * Outputs the specified error message to stderr so it will appear via the USB 
00044  * serial port, and then calls exit(1) to die with the blue lights of death.
00045  *
00046  * Variables:
00047  *  format - printf-style format string, followed by associated variables
00048  */
00049 void error(const char* format, ...);
00050 #endif  
00051 
00052 #include <stdlib.h>
00053 
00054 #ifdef NDEBUG
00055     #define error(...) (exit(1))
00056 #else
00057     #include <stdio.h>
00058     #define error(...) (fprintf(stderr, __VA_ARGS__), exit(1))
00059 #endif
00060 
00061 #endif