1 files changed, 197 insertions, 0 deletions
diff --git a/include/libcamera/internal/utils.h b/include/libcamera/internal/utils.h
new file mode 100644
index 00000000..3334ff16
--- /dev/null
+++ b/include/libcamera/internal/utils.h
@@ -0,0 +1,197 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018, Google Inc.
+ *
+ * utils.h - Miscellaneous utility functions
+ */
+#ifndef __LIBCAMERA_UTILS_H__
+#define __LIBCAMERA_UTILS_H__
+
+#include <algorithm>
+#include <chrono>
+#include <memory>
+#include <ostream>
+#include <sstream>
+#include <string>
+#include <string.h>
+#include <sys/time.h>
+
+#define ARRAY_SIZE(a)	(sizeof(a) / sizeof(a[0]))
+
+#ifndef __DOXYGEN__
+
+/* uClibc and uClibc-ng don't provide O_TMPFILE */
+#ifndef O_TMPFILE
+#define O_TMPFILE	(020000000 | O_DIRECTORY)
+#endif
+
+#endif
+
+namespace libcamera {
+
+namespace utils {
+
+const char *basename(const char *path);
+
+char *secure_getenv(const char *name);
+std::string dirname(const std::string &path);
+
+template<class InputIt1, class InputIt2>
+unsigned int set_overlap(InputIt1 first1, InputIt1 last1,
+			 InputIt2 first2, InputIt2 last2)
+{
+	unsigned int count = 0;
+
+	while (first1 != last1 && first2 != last2) {
+		if (*first1 < *first2) {
+			++first1;
+		} else {
+			if (!(*first2 < *first1))
+				count++;
+			++first2;
+		}
+	}
+
+	return count;
+}
+
+/* C++11 doesn't provide std::clamp */
+template <typename T>
+const T& clamp(const T& v, const T& lo, const T& hi)
+{
+	return std::max(lo, std::min(v, hi));
+}
+
+using clock = std::chrono::steady_clock;
+using duration = std::chrono::steady_clock::duration;
+using time_point = std::chrono::steady_clock::time_point;
+
+struct timespec duration_to_timespec(const duration &value);
+std::string time_point_to_string(const time_point &time);
+
+#ifndef __DOXYGEN__
+struct _hex {
+	uint64_t v;
+	unsigned int w;
+};
+
+std::basic_ostream<char, std::char_traits<char>> &
+operator<<(std::basic_ostream<char, std::char_traits<char>> &stream, const _hex &h);
+#endif
+
+template<typename T>
+_hex hex(T value, unsigned int width = 0);
+
+#ifndef __DOXYGEN__
+template<>
+inline _hex hex<int32_t>(int32_t value, unsigned int width)
+{
+	return { static_cast<uint64_t>(value), width ? width : 8 };
+}
+
+template<>
+inline _hex hex<uint32_t>(uint32_t value, unsigned int width)
+{
+	return { static_cast<uint64_t>(value), width ? width : 8 };
+}
+
+template<>
+inline _hex hex<int64_t>(int64_t value, unsigned int width)
+{
+	return { static_cast<uint64_t>(value), width ? width : 16 };
+}
+
+template<>
+inline _hex hex<uint64_t>(uint64_t value, unsigned int width)
+{
+	return { static_cast<uint64_t>(value), width ? width : 16 };
+}
+#endif
+
+size_t strlcpy(char *dst, const char *src, size_t size);
+
+#ifndef __DOXYGEN__
+template<typename Container, typename UnaryOp>
+std::string join(const Container &items, const std::string &sep, UnaryOp op)
+{
+	std::ostringstream ss;
+	bool first = true;
+
+	for (typename Container::const_iterator it = std::begin(items);
+	     it != std::end(items); ++it) {
+		if (!first)
+			ss << sep;
+		else
+			first = false;
+
+		ss << op(*it);
+	}
+
+	return ss.str();
+}
+
+template<typename Container>
+std::string join(const Container &items, const std::string &sep)
+{
+	std::ostringstream ss;
+	bool first = true;
+
+	for (typename Container::const_iterator it = std::begin(items);
+	     it != std::end(items); ++it) {
+		if (!first)
+			ss << sep;
+		else
+			first = false;
+
+		ss << *it;
+	}
+
+	return ss.str();
+}
+#else
+template<typename Container, typename UnaryOp>
+std::string join(const Container &items, const std::string &sep, UnaryOp op = nullptr);
+#endif
+
+namespace details {
+
+class StringSplitter
+{
+public:
+	StringSplitter(const std::string &str, const std::string &delim);
+
+	class iterator
+	{
+	public:
+		iterator(const StringSplitter *ss, std::string::size_type pos);
+
+		iterator &operator++();
+		std::string operator*() const;
+		bool operator!=(const iterator &other) const;
+
+	private:
+		const StringSplitter *ss_;
+		std::string::size_type pos_;
+		std::string::size_type next_;
+	};
+
+	iterator begin() const;
+	iterator end() const;
+
+private:
+	std::string str_;
+	std::string delim_;
+};
+
+} /* namespace details */
+
+details::StringSplitter split(const std::string &str, const std::string &delim);
+
+std::string libcameraBuildPath();
+std::string libcameraSourcePath();
+
+} /* namespace utils */
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_UTILS_H__ */