Split V4L2 code into separate libs

Create v4l2++ library and pyv4l2, which are independent from the rest of
the kms++.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/v4l2++/inc/v4l2++/helpers.h b/v4l2++/inc/v4l2++/helpers.h
new file mode 100644
index 0000000..b5c3284
--- /dev/null
+++ b/v4l2++/inc/v4l2++/helpers.h
@@ -0,0 +1,60 @@
+#pragma once
+
+#include <fmt/format.h>
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+#define unlikely(x) __builtin_expect(!!(x), 0)
+
+/* __STRING(x) is a glibcism (i.e. not standard), which happens to also
+ * be available in uClibc. However, musl does not define it. Do it here.
+ */
+#ifndef __STRING
+#define __STRING(x) #x
+#endif
+
+#define ASSERT(x)                                                                                                        \
+	if (unlikely(!(x))) {                                                                                            \
+		fprintf(stderr, "%s:%d: %s: ASSERT(%s) failed\n", __FILE__, __LINE__, __PRETTY_FUNCTION__, __STRING(x)); \
+		abort();                                                                                                 \
+	}
+
+#define FAIL(fmt, ...)                                                                                            \
+	do {                                                                                                      \
+		fprintf(stderr, "%s:%d: %s:\n" fmt "\n", __FILE__, __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__); \
+		abort();                                                                                          \
+	} while (0)
+
+#define FAIL_IF(x, format, ...)                                                                                      \
+	if (unlikely(x)) {                                                                                        \
+		fprintf(stderr, "%s:%d: %s:\n" format "\n", __FILE__, __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__); \
+		abort();                                                                                          \
+	}
+
+#define EXIT(fmt, ...)                                    \
+	do {                                              \
+		fprintf(stderr, fmt "\n", ##__VA_ARGS__); \
+		exit(-1);                                 \
+	} while (0)
+
+#define EXIT_IF(x, fmt, ...)                              \
+	if (unlikely(x)) {                                \
+		fprintf(stderr, fmt "\n", ##__VA_ARGS__); \
+		exit(-1);                                 \
+	}
+
+void __my_throw(const char* file, int line, const char* funcname, const char* cond, fmt::string_view format, fmt::format_args args);
+
+template<typename S, typename... Args>
+void _my_throw(const char* file, int line, const char* funcname, const char* cond, const S& format, Args&&... args)
+{
+	__my_throw(file, line, funcname, cond, format, fmt::make_format_args(args...));
+}
+
+#define THROW(format, ...) \
+	_my_throw(__FILE__, __LINE__, __PRETTY_FUNCTION__, nullptr, format, ##__VA_ARGS__);
+
+#define THROW_IF(x, format, ...)                                                               \
+	if (unlikely(x)) {                                                                     \
+		_my_throw(__FILE__, __LINE__, __PRETTY_FUNCTION__, #x, format, ##__VA_ARGS__); \
+	}