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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * utils.cpp - Miscellaneous utility functions
 */

#include <libcamera/base/utils.h>

#include <iomanip>
#include <sstream>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/**
 * \file base/utils.h
 * \brief Miscellaneous utility functions
 */

namespace libcamera {

namespace utils {

/**
 * \brief Strip the directory prefix from the path
 * \param[in] path The path to process
 *
 * basename is implemented differently across different C libraries. This
 * implementation matches the one provided by the GNU libc, and does not
 * modify its input parameter.
 *
 * \return A pointer within the given path without any leading directory
 * components.
 */
const char *basename(const char *path)
{
	const char *base = strrchr(path, '/');
	return base ? base + 1 : path;
}

/**
 * \brief Get an environment variable
 * \param[in] name The name of the variable to return
 *
 * The environment list is searched to find the variable 'name', and the
 * corresponding string is returned.
 *
 * If 'secure execution' is required then this function always returns NULL to
 * avoid vulnerabilities that could occur if set-user-ID or set-group-ID
 * programs accidentally trust the environment.
 *
 * \note Not all platforms may support the features required to implement the
 * secure execution check, in which case this function behaves as getenv(). A
 * notable example of this is Android.
 *
 * \return A pointer to the value in the environment or NULL if the requested
 * environment variable doesn't exist or if secure execution is required.
 */
char *secure_getenv(const char *name)
{
#if HAVE_SECURE_GETENV
	return ::secure_getenv(name);
#else
#if HAVE_ISSETUGID
	if (issetugid())
		return NULL;
#endif
	return getenv(name);
#endif
}

/**
 * \brief Identify the dirname portion of a path
 * \param[in] path The full path to parse
 *
 * This function conforms with the behaviour of the %dirname() function as
 * defined by POSIX.
 *
 * \return A string of the directory component of the path
 */
std::string dirname(const std::string &path)
{
	if (path.empty())
		return ".";

	/*
	 * Skip all trailing slashes. If the path is only made of slashes,
	 * return "/".
	 */
	size_t pos = path.size() - 1;
	while (path[pos] == '/') {
		if (!pos)
			return "/";
		pos--;
	}

	/*
	 * Find the previous slash. If the path contains no non-trailing slash,
	 * return ".".
	 */
	while (path[pos] != '/') {
		if (!pos)
			return ".";
		pos--;
	}

	/*
	 * Return the directory name up to (but not including) any trailing
	 * slash. If this would result in an empty string, return "/".
	 */
	while (path[pos] == '/') {
		if (!pos)
			return "/";
		pos--;
	}

	return path.substr(0, pos + 1);
}

/**
 * \fn std::vector<typename T::key_type> map_keys(const T &map)
 * \brief Retrieve the keys of a std::map<>
 * \param[in] map The map whose keys to retrieve
 * \return A std::vector<> containing the keys of \a map
 */

/**
 * \fn libcamera::utils::set_overlap(InputIt1 first1, InputIt1 last1,
 *				     InputIt2 first2, InputIt2 last2)
 * \brief Count the number of elements in the intersection of two ranges
 *
 * Count the number of elements in the intersection of the sorted ranges [\a
 * first1, \a last1) and [\a first1, \a last2). Elements are compared using
 * operator< and the ranges must be sorted with respect to the same.
 *
 * \return The number of elements in the intersection of the two ranges
 */

/**
 * \typedef clock
 * \brief The libcamera clock (monotonic)
 */

/**
 * \typedef duration
 * \brief The libcamera duration related to libcamera::utils::clock
 */

/**
 * \typedef time_point
 * \brief The libcamera time point related to libcamera::utils::clock
 */

/**
 * \brief Convert a duration to a timespec
 * \param[in] value The duration
 * \return A timespec expressing the duration
 */
struct timespec duration_to_timespec(const duration &value)
{
	uint64_t nsecs = std::chrono::duration_cast<std::chrono::nanoseconds>(value).count();
	struct timespec ts;
	ts.tv_sec = nsecs / 1000000000ULL;
	ts.tv_nsec = nsecs % 1000000000ULL;
	return ts;
}

/**