move some macro magic out of libuci.c

[project/uci.git] / err.h

diff --git a/err.h b/err.h
new file mode 100644 (file)
index 0000000..2800526
--- /dev/null
+++ b/err.h
@@ -0,0 +1,63 @@
+/*
+ * libuci - Library for the Unified Configuration Interface
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * functions for debug and error handling
+ */
+
+#ifdef DEBUG
+#define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
+#else
+#define DPRINTF(...)
+#endif
+
+/* 
+ * throw an uci exception and store the error number
+ * in the context.
+ */
+#define UCI_THROW(ctx, err) do {       \
+       longjmp(ctx->trap, err);        \
+} while (0)
+
+/*
+ * store the return address for handling exceptions
+ * needs to be called in every externally visible library function
+ *
+ * NB: this does not handle recursion at all. Calling externally visible
+ * functions from other uci functions is only allowed at the end of the
+ * calling function.
+ */
+#define UCI_HANDLE_ERR(ctx) do {               \
+       int __val;                      \
+       if (!ctx)                       \
+               return UCI_ERR_INVAL;   \
+       __val = setjmp(ctx->trap);      \
+       if (__val) {                    \
+               ctx->errno = __val;     \
+               return __val;           \
+       }                               \
+} while (0)
+
+/*
+ * check the specified condition.
+ * throw an invalid argument exception if it's false
+ */
+#define UCI_ASSERT(ctx, expr) do {     \
+       if (!(expr)) {                  \
+               DPRINTF("[%s:%d] Assertion failed\n", __FILE__, __LINE__); \
+               UCI_THROW(ctx, UCI_ERR_INVAL);  \
+       }                               \
+} while (0)
+
+