Added assert.h, with assert() defined (almost) as per POSIX, and

linker_assert() defined as gPXE-specific.

diff --git a/src/include/assert.h b/src/include/assert.h
new file mode 100644 (file)
index 0000000..b4dfe12
--- /dev/null
+++ b/src/include/assert.h
@@ -0,0 +1,51 @@
+#ifndef _ASSERT_H
+#define _ASSERT_H
+
+/** @file
+ *
+ * Assertions
+ *
+ * This file provides two assertion macros: assert() (for run-time
+ * assertions) and linker_assert() (for link-time assertions).
+ *
+ */
+
+/**
+ * Assert a condition at run-time.
+ *
+ * If the condition is not true, a debug message will be printed.
+ * Assertions only take effect in debug-enabled builds (see DBG()).
+ *
+ * @todo Make an assertion failure abort the program
+ *
+ */
+#define assert( condition )                                               \
+       do {                                                               \
+               if ( ! (condition) ) {                                     \
+                       printf ( "assert(%s) failed at %s line %d [%s]\n", \
+                                #condition, __FILE__, __LINE__,           \
+                                __FUNCTION__ );                           \
+               }                                                          \
+       } while ( 0 )
+
+/**
+ * Assert a condition at link-time.
+ *
+ * If the condition is not true, the link will fail with an unresolved
+ * symbol (error_symbol).
+ *
+ * This macro is gPXE-specific.  Do not use this macro in code
+ * intended to be portable.
+ *
+ */
+#define linker_assert( condition, error_symbol )       \
+        if ( ! (condition) ) {                         \
+                extern void error_symbol ( void );     \
+                error_symbol();                                \
+        }
+
+#ifdef NDEBUG
+#undef assert
+#define assert(x) do {} while ( 0 )
+
+#endif /* _ASSERT_H */