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+/**
+ * Copyright (c) 2007-2012, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file lnav_util.hh
+ *
+ * Dumping ground for useful functions with no other home.
+ */
+
+#ifndef lnav_util_hh
+#define lnav_util_hh
+
+#include <future>
+#include <iterator>
+#include <numeric>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+#include <fcntl.h>
+#include <poll.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include "base/auto_mem.hh"
+#include "base/intern_string.hh"
+#include "base/lnav.console.hh"
+#include "base/result.h"
+#include "byte_array.hh"
+#include "config.h"
+#include "fmt/format.h"
+#include "optional.hpp"
+#include "ptimec.hh"
+#include "spookyhash/SpookyV2.h"
+
+#if SIZEOF_OFF_T == 8
+# define FORMAT_OFF_T "%lld"
+#elif SIZEOF_OFF_T == 4
+# define FORMAT_OFF_T "%ld"
+#else
+# error "off_t has unhandled size..."
+#endif
+
+class hasher {
+public:
+ using array_t = byte_array<2, uint64_t>;
+ static constexpr size_t STRING_SIZE = array_t::STRING_SIZE;
+
+ hasher() { this->h_context.Init(0, 0); }
+
+ hasher& update(const std::string& str)
+ {
+ this->h_context.Update(str.data(), str.length());
+
+ return *this;
+ }
+
+ hasher& update(const string_fragment& str)
+ {
+ this->h_context.Update(str.data(), str.length());
+
+ return *this;
+ }
+
+ hasher& update(const char* bits, size_t len)
+ {
+ this->h_context.Update(bits, len);
+
+ return *this;
+ }
+
+ hasher& update(int64_t value)
+ {
+ value = SPOOKYHASH_LITTLE_ENDIAN_64(value);
+ this->h_context.Update(&value, sizeof(value));
+
+ return *this;
+ }
+
+ array_t to_array()
+ {
+ uint64_t h1;
+ uint64_t h2;
+ array_t retval;
+
+ this->h_context.Final(&h1, &h2);
+ *retval.out(0) = SPOOKYHASH_LITTLE_ENDIAN_64(h1);
+ *retval.out(1) = SPOOKYHASH_LITTLE_ENDIAN_64(h2);
+ return retval;
+ }
+
+ void to_string(auto_buffer& buf)
+ {
+ array_t bits = this->to_array();
+
+ bits.to_string(std::back_inserter(buf));
+ }
+
+ std::string to_string()
+ {
+ array_t bits = this->to_array();
+ return bits.to_string();
+ }
+
+ std::string to_uuid_string()
+ {
+ array_t bits = this->to_array();
+ return bits.to_uuid_string();
+ }
+
+private:
+ SpookyHash h_context;
+};
+
+bool change_to_parent_dir();
+
+bool next_format(const char* const fmt[], int& index, int& locked_index);
+
+namespace std {
+inline string
+to_string(const string& s)
+{
+ return s;
+}
+inline string
+to_string(const char* s)
+{
+ return s;
+}
+} // namespace std
+
+inline bool
+is_glob(const std::string& fn)
+{
+ return (fn.find('*') != std::string::npos
+ || fn.find('?') != std::string::npos
+ || fn.find('[') != std::string::npos);
+}
+
+inline void
+rusagesub(const struct rusage& left,
+ const struct rusage& right,
+ struct rusage& diff_out)
+{
+ timersub(&left.ru_utime, &right.ru_utime, &diff_out.ru_utime);
+ timersub(&left.ru_stime, &right.ru_stime, &diff_out.ru_stime);
+ diff_out.ru_maxrss = left.ru_maxrss - right.ru_maxrss;
+ diff_out.ru_ixrss = left.ru_ixrss - right.ru_ixrss;
+ diff_out.ru_idrss = left.ru_idrss - right.ru_idrss;
+ diff_out.ru_isrss = left.ru_isrss - right.ru_isrss;
+ diff_out.ru_minflt = left.ru_minflt - right.ru_minflt;
+ diff_out.ru_majflt = left.ru_majflt - right.ru_majflt;
+ diff_out.ru_nswap = left.ru_nswap - right.ru_nswap;
+ diff_out.ru_inblock = left.ru_inblock - right.ru_inblock;
+ diff_out.ru_oublock = left.ru_oublock - right.ru_oublock;
+ diff_out.ru_msgsnd = left.ru_msgsnd - right.ru_msgsnd;
+ diff_out.ru_msgrcv = left.ru_msgrcv - right.ru_msgrcv;
+ diff_out.ru_nvcsw = left.ru_nvcsw - right.ru_nvcsw;
+ diff_out.ru_nivcsw = left.ru_nivcsw - right.ru_nivcsw;
+}
+
+inline void
+rusageadd(const struct rusage& left,
+ const struct rusage& right,
+ struct rusage& diff_out)
+{
+ timeradd(&left.ru_utime, &right.ru_utime, &diff_out.ru_utime);
+ timeradd(&left.ru_stime, &right.ru_stime, &diff_out.ru_stime);
+ diff_out.ru_maxrss = left.ru_maxrss + right.ru_maxrss;
+ diff_out.ru_ixrss = left.ru_ixrss + right.ru_ixrss;
+ diff_out.ru_idrss = left.ru_idrss + right.ru_idrss;
+ diff_out.ru_isrss = left.ru_isrss + right.ru_isrss;
+ diff_out.ru_minflt = left.ru_minflt + right.ru_minflt;
+ diff_out.ru_majflt = left.ru_majflt + right.ru_majflt;
+ diff_out.ru_nswap = left.ru_nswap + right.ru_nswap;
+ diff_out.ru_inblock = left.ru_inblock + right.ru_inblock;
+ diff_out.ru_oublock = left.ru_oublock + right.ru_oublock;
+ diff_out.ru_msgsnd = left.ru_msgsnd + right.ru_msgsnd;
+ diff_out.ru_msgrcv = left.ru_msgrcv + right.ru_msgrcv;
+ diff_out.ru_nvcsw = left.ru_nvcsw + right.ru_nvcsw;
+ diff_out.ru_nivcsw = left.ru_nivcsw + right.ru_nivcsw;
+}
+
+bool is_dev_null(const struct stat& st);
+bool is_dev_null(int fd);
+
+template<typename A>
+struct final_action { // slightly simplified
+ A act;
+ final_action(A a) : act{a} {}
+ ~final_action() { act(); }
+};
+
+template<typename A>
+final_action<A>
+finally(A act) // deduce action type
+{
+ return final_action<A>{act};
+}
+
+void write_line_to(FILE* outfile, const attr_line_t& al);
+
+namespace lnav {
+
+std::string to_json(const std::string& str);
+std::string to_json(const lnav::console::user_message& um);
+std::string to_json(const attr_line_t& al);
+
+template<typename T>
+Result<T, std::vector<lnav::console::user_message>> from_json(
+ const std::string& json);
+
+} // namespace lnav
+
+#endif
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