text: /* clang-format off */
  /*
      util.h - utility functions
      Copyright (C) 2016-present, Przemyslaw Skibinski, Yann Collet
  
      This program is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published by
      the Free Software Foundation; either version 2 of the License, or
      (at your option) any later version.
  
      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.
  
      You should have received a copy of the GNU General Public License along
      with this program; if not, write to the Free Software Foundation, Inc.,
      51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
  
  #ifndef UTIL_H_MODULE
  #define UTIL_H_MODULE
  
  #if defined (__cplusplus)
  extern "C" {
  #endif
  
  
  
  /*-****************************************
  *  Dependencies
  ******************************************/
  
  #include "third_party/lz4cli/platform.h"
  #include "libc/mem/mem.h"     
  #include "libc/str/str.h"     
  #include "libc/stdio/stdio.h"      
  #include "libc/calls/calls.h"
  #include "libc/time/time.h"
  #include "libc/errno.h"
  #include "libc/fmt/fmt.h"
  #include "libc/time/struct/utimbuf.h"
  #include "libc/calls/struct/stat.h"
  #include "libc/calls/struct/dirent.h"
  #include "libc/sysv/consts/s.h"
  #include "libc/calls/weirdtypes.h"
  
  
  
  /*-**************************************************************
  *  Basic Types
  *****************************************************************/
  #if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
    typedef  uint8_t BYTE;
    typedef uint16_t U16;
    typedef  int16_t S16;
    typedef uint32_t U32;
    typedef  int32_t S32;
    typedef uint64_t U64;
    typedef  int64_t S64;
  #else
    typedef unsigned char       BYTE;
    typedef unsigned short      U16;
    typedef   signed short      S16;
    typedef unsigned int        U32;
    typedef   signed int        S32;
    typedef unsigned long long  U64;
    typedef   signed long long  S64;
  #endif
  
  
  /* ************************************************************
  * Avoid fseek()'s 2GiB barrier with MSVC, MacOS, *BSD, MinGW
  ***************************************************************/
  #if defined(_MSC_VER) && (_MSC_VER >= 1400)
  #   define UTIL_fseek _fseeki64
  #elif !defined(__64BIT__) && (PLATFORM_POSIX_VERSION >= 200112L) /* No point defining Large file for 64 bit */
  #  define UTIL_fseek fseeko
  #elif defined(__MINGW32__) && defined(__MSVCRT__) && !defined(__STRICT_ANSI__) && !defined(__NO_MINGW_LFS)
  #   define UTIL_fseek fseeko64
  #else
  #   define UTIL_fseek fseek
  #endif
  
  
  /*-****************************************
  *  Sleep functions: Windows - Posix - others
  ******************************************/
  #if defined(_WIN32)
  #  include <windows.h>
  #  define SET_REALTIME_PRIORITY SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS)
  #  define UTIL_sleep(s) Sleep(1000*s)
  #  define UTIL_sleepMilli(milli) Sleep(milli)
  #elif PLATFORM_POSIX_VERSION >= 0 /* Unix-like operating system */
  #  include "libc/calls/calls.h"
  #  if defined(PRIO_PROCESS)
  #    define SET_REALTIME_PRIORITY setpriority(PRIO_PROCESS, 0, -20)
  #  else
  #    define SET_REALTIME_PRIORITY /* disabled */
  #  endif
  #  define UTIL_sleep(s) sleep(s)
  #  if (defined(__linux__) && (PLATFORM_POSIX_VERSION >= 199309L)) || (PLATFORM_POSIX_VERSION >= 200112L)  /* nanosleep requires POSIX.1-2001 */
  #      define UTIL_sleepMilli(milli) { struct timespec t; t.tv_sec=0; t.tv_nsec=milli*1000000ULL; nanosleep(&t, NULL); }
  #  else
  #      define UTIL_sleepMilli(milli) /* disabled */
  #  endif
  #else
  #  define SET_REALTIME_PRIORITY      /* disabled */
  #  define UTIL_sleep(s)          /* disabled */
  #  define UTIL_sleepMilli(milli) /* disabled */
  #endif
  
  
  /* *************************************
  *  Constants
  ***************************************/
  #define LIST_SIZE_INCREASE   (8*1024)
  
  
  /*-****************************************
  *  Compiler specifics
  ******************************************/
  #if defined(__INTEL_COMPILER)
  #  pragma warning(disable : 177)    /* disable: message #177: function was declared but never referenced, useful with UTIL_STATIC */
  #endif
  #if defined(__GNUC__)
  #  define UTIL_STATIC static __attribute__((unused))
  #elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
  #  define UTIL_STATIC static inline
  #elif defined(_MSC_VER)
  #  define UTIL_STATIC static __inline
  #else
  #  define UTIL_STATIC static  /* this version may generate warnings for unused static functions; disable the relevant warning */
  #endif
  
  
  /*-****************************************
  *  Time functions
  ******************************************/
  #if defined(_WIN32)   /* Windows */
  
      typedef LARGE_INTEGER UTIL_time_t;
      UTIL_STATIC UTIL_time_t UTIL_getTime(void) { UTIL_time_t x; QueryPerformanceCounter(&x); return x; }
      UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
      {
          static LARGE_INTEGER ticksPerSecond;
          static int init = 0;
          if (!init) {
              if (!QueryPerformanceFrequency(&ticksPerSecond))
                  fprintf(stderr, "ERROR: QueryPerformanceFrequency() failure\n");
              init = 1;
          }
          return 1000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
      }
      UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
      {
          static LARGE_INTEGER ticksPerSecond;
          static int init = 0;
          if (!init) {
              if (!QueryPerformanceFrequency(&ticksPerSecond))
                  fprintf(stderr, "ERROR: QueryPerformanceFrequency() failure\n");
              init = 1;
          }
          return 1000000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
      }
  
  #elif defined(__APPLE__) && defined(__MACH__)
  
      #include <mach/mach_time.h>
      typedef U64 UTIL_time_t;
      UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return mach_absolute_time(); }
      UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
      {
          static mach_timebase_info_data_t rate;
          static int init = 0;
          if (!init) {
              mach_timebase_info(&rate);
              init = 1;
          }
          return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom)) / 1000ULL;
      }
      UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
      {
          static mach_timebase_info_data_t rate;
          static int init = 0;
          if (!init) {
              mach_timebase_info(&rate);
              init = 1;
          }
          return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom);
      }
  
  #elif (PLATFORM_POSIX_VERSION >= 200112L) && (defined __UCLIBC__ || (defined(__GLIBC__) && ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17) || __GLIBC__ > 2) ) )
  
      #include "libc/time/time.h"
      typedef struct timespec UTIL_time_t;
      UTIL_STATIC UTIL_time_t UTIL_getTime(void)
      {
          UTIL_time_t now;
          if (clock_gettime(CLOCK_MONOTONIC, &now))
              fprintf(stderr, "ERROR: Failed to get time\n");   /* we could also exit() */
          return now;
      }
      UTIL_STATIC UTIL_time_t UTIL_getSpanTime(UTIL_time_t begin, UTIL_time_t end)
      {
          UTIL_time_t diff;
          if (end.tv_nsec < begin.tv_nsec) {
              diff.tv_sec = (end.tv_sec - 1) - begin.tv_sec;
              diff.tv_nsec = (end.tv_nsec + 1000000000ULL) - begin.tv_nsec;
          } else {
              diff.tv_sec = end.tv_sec - begin.tv_sec;
              diff.tv_nsec = end.tv_nsec - begin.tv_nsec;
          }
          return diff;
      }
      UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end)
      {
          UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
          U64 micro = 0;
          micro += 1000000ULL * diff.tv_sec;
          micro += diff.tv_nsec / 1000ULL;
          return micro;
      }
      UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t begin, UTIL_time_t end)
      {
          UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
          U64 nano = 0;
          nano += 1000000000ULL * diff.tv_sec;
          nano += diff.tv_nsec;
          return nano;
      }
  
  #else   /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */
  
      typedef clock_t UTIL_time_t;
      UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return clock(); }
      UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
      UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
  #endif
  
  
  /* returns time span in microseconds */
  UTIL_STATIC U64 UTIL_clockSpanMicro(UTIL_time_t clockStart)
  {
      UTIL_time_t const clockEnd = UTIL_getTime();
      return UTIL_getSpanTimeMicro(clockStart, clockEnd);
  }
  
  /* returns time span in nanoseconds */
  UTIL_STATIC U64 UTIL_clockSpanNano(UTIL_time_t clockStart)
  {
      UTIL_time_t const clockEnd = UTIL_getTime();
      return UTIL_getSpanTimeNano(clockStart, clockEnd);
  }
  
  UTIL_STATIC void UTIL_waitForNextTick(void)
  {
      UTIL_time_t const clockStart = UTIL_getTime();
      UTIL_time_t clockEnd;
      do {
          clockEnd = UTIL_getTime();
      } while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0);
  }
  
  
  
  /*-****************************************
  *  File functions
  ******************************************/
  
  
  UTIL_STATIC int UTIL_isRegFile(const char* infilename);
  
  
  UTIL_STATIC int UTIL_setFileStat(const char *filename, struct stat *statbuf)
  {
      int res = 0;
      struct utimbuf timebuf;
  
      if (!UTIL_isRegFile(filename))
          return -1;
  
      timebuf.actime = time(NULL);
      timebuf.modtime = statbuf->st_mtim.tv_sec;
      res += utime(filename, &timebuf);  /* set access and modification times */
  
  #if !defined(_WIN32)
      res += chown(filename, statbuf->st_uid, statbuf->st_gid);  /* Copy ownership */
  #endif
  
      res += chmod(filename, statbuf->st_mode & 07777);  /* Copy file permissions */
  
      errno = 0;
      return -res; /* number of errors is returned */
  }
  
  
  UTIL_STATIC int UTIL_getFileStat(const char* infilename, struct stat *statbuf)
  {
      int r;
  #if defined(_MSC_VER)
      r = _stat64(infilename, statbuf);
      if (r || !(statbuf->st_mode & S_IFREG)) return 0;   /* No good... */
  #else
      r = stat(infilename, statbuf);
      if (r || !S_ISREG(statbuf->st_mode)) return 0;   /* No good... */
  #endif
      return 1;
  }
  
  
  UTIL_STATIC int UTIL_isRegFile(const char* infilename)
  {
      struct stat statbuf;
      return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
  }
  
  
  UTIL_STATIC U32 UTIL_isDirectory(const char* infilename)
  {
      int r;
      struct stat statbuf;
  #if defined(_MSC_VER)
      r = _stat64(infilename, &statbuf);
      if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
  #else
      r = stat(infilename, &statbuf);
      if (!r && S_ISDIR(statbuf.st_mode)) return 1;
  #endif
      return 0;
  }
  
  
  UTIL_STATIC U64 UTIL_getFileSize(const char* infilename)
  {
      int r;
  #if defined(_MSC_VER)
      struct __stat64 statbuf;
      r = _stat64(infilename, &statbuf);
      if (r || !(statbuf.st_mode & S_IFREG)) return 0;   /* No good... */
  #elif defined(__MINGW32__) && defined (__MSVCRT__)
      struct _stati64 statbuf;
      r = _stati64(infilename, &statbuf);
      if (r || !(statbuf.st_mode & S_IFREG)) return 0;   /* No good... */
  #else
      struct stat statbuf;
      r = stat(infilename, &statbuf);
      if (r || !S_ISREG(statbuf.st_mode)) return 0;   /* No good... */
  #endif
      return (U64)statbuf.st_size;
  }
  
  
  UTIL_STATIC U64 UTIL_getTotalFileSize(const char** fileNamesTable, unsigned nbFiles)
  {
      U64 total = 0;
      unsigned n;
      for (n=0; n<nbFiles; n++)
          total += UTIL_getFileSize(fileNamesTable[n]);
      return total;
  }
  
  
  /*
   * A modified version of realloc().
   * If UTIL_realloc() fails the original block is freed.
  */
  UTIL_STATIC void *UTIL_realloc(void *ptr, size_t size)
  {
      void *newptr = realloc(ptr, size);
      if (newptr) return newptr;
      free(ptr);
      return NULL;
  }
  
  
  #ifdef _WIN32
  #  define UTIL_HAS_CREATEFILELIST
  
  UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd)
  {
      char* path;
      int dirLength, fnameLength, pathLength, nbFiles = 0;
      WIN32_FIND_DATAA cFile;
      HANDLE hFile;
  
      dirLength = (int)strlen(dirName);
      path = (char*) malloc(dirLength + 3);
      if (!path) return 0;
  
      memcpy(path, dirName, dirLength);
      path[dirLength] = '\\';
      path[dirLength+1] = '*';
      path[dirLength+2] = 0;
  
      hFile=FindFirstFileA(path, &cFile);
      if (hFile == INVALID_HANDLE_VALUE) {
          fprintf(stderr, "Cannot open directory '%s'\n", dirName);
          return 0;
      }
      free(path);
  
      do {
          fnameLength = (int)strlen(cFile.cFileName);
          path = (char*) malloc(dirLength + fnameLength + 2);
          if (!path) { FindClose(hFile); return 0; }
          memcpy(path, dirName, dirLength);
          path[dirLength] = '\\';
          memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
          pathLength = dirLength+1+fnameLength;
          path[pathLength] = 0;
          if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
              if (strcmp (cFile.cFileName, "..") == 0 ||
                  strcmp (cFile.cFileName, ".") == 0) continue;
  
              nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd);  /* Recursively call "UTIL_prepareFileList" with the new path. */
              if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
          }
          else if ((cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED)) {
              if (*bufStart + *pos + pathLength >= *bufEnd) {
                  ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
                  *bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
                  *bufEnd = *bufStart + newListSize;
                  if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
              }
              if (*bufStart + *pos + pathLength < *bufEnd) {
                  strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
                  *pos += pathLength + 1;
                  nbFiles++;
              }
          }
          free(path);
      } while (FindNextFileA(hFile, &cFile));
  
      FindClose(hFile);
      return nbFiles;
  }
  
  #elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L)  /* opendir, readdir require POSIX.1-2001 */
  #  define UTIL_HAS_CREATEFILELIST
  #  include "libc/calls/calls.h"
  #  include "libc/str/str.h"
  
  UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd)
  {
      DIR *dir;
      struct dirent *entry;
      char* path;
      int dirLength, fnameLength, pathLength, nbFiles = 0;
  
      if (!(dir = opendir(dirName))) {
          fprintf(stderr, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
          return 0;
      }
  
      dirLength = (int)strlen(dirName);
      errno = 0;
      while ((entry = readdir(dir)) != NULL) {
          if (strcmp (entry->d_name, "..") == 0 ||
              strcmp (entry->d_name, ".") == 0) continue;
          fnameLength = (int)strlen(&entry->d_name[0]);
          path = (char*) malloc(dirLength + fnameLength + 2);
          if (!path) { closedir(dir); return 0; }
          memcpy(path, dirName, dirLength);
          path[dirLength] = '/';
          memcpy(path+dirLength+1, entry->d_name, fnameLength);
          pathLength = dirLength+1+fnameLength;
          path[pathLength] = 0;
  
          if (UTIL_isDirectory(path)) {
              nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd);  /* Recursively call "UTIL_prepareFileList" with the new path. */
              if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
          } else {
              if (*bufStart + *pos + pathLength >= *bufEnd) {
                  ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
                  *bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
                  *bufEnd = *bufStart + newListSize;
                  if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
              }
              if (*bufStart + *pos + pathLength < *bufEnd) {
                  strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
                  *pos += pathLength + 1;
                  nbFiles++;
              }
          }
          free(path);
          errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
      }
  
      if (errno != 0) {
          fprintf(stderr, "readdir(%s) error: %s\n", dirName, strerror(errno));
          free(*bufStart);
          *bufStart = NULL;
      }
      closedir(dir);
      return nbFiles;
  }
  
  #else
  
  UTIL_STATIC int UTIL_prepareFileList(const char *dirName, char** bufStart, size_t* pos, char** bufEnd)
  {
      (void)bufStart; (void)bufEnd; (void)pos;
      fprintf(stderr, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName);
      return 0;
  }
  
  #endif /* #ifdef _WIN32 */
  
  /*
   * UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories,
   *                       and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb).
   * After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer)
   * In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called.
   */
  UTIL_STATIC const char** UTIL_createFileList(const char **inputNames, unsigned inputNamesNb, char** allocatedBuffer, unsigned* allocatedNamesNb)
  {
      size_t pos;
      unsigned i, nbFiles;
      char* buf = (char*)malloc(LIST_SIZE_INCREASE);
      char* bufend = buf + LIST_SIZE_INCREASE;
      const char** fileTable;
  
      if (!buf) return NULL;
  
      for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) {
          if (!UTIL_isDirectory(inputNames[i])) {
              size_t const len = strlen(inputNames[i]);
              if (buf + pos + len >= bufend) {
                  ptrdiff_t newListSize = (bufend - buf) + LIST_SIZE_INCREASE;
                  buf = (char*)UTIL_realloc(buf, newListSize);
                  bufend = buf + newListSize;
                  if (!buf) return NULL;
              }
              if (buf + pos + len < bufend) {
                  strncpy(buf + pos, inputNames[i], bufend - (buf + pos));
                  pos += len + 1;
                  nbFiles++;
              }
          } else {
              nbFiles += UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend);
              if (buf == NULL) return NULL;
      }   }
  
      if (nbFiles == 0) { free(buf); return NULL; }
  
      fileTable = (const char**)malloc((nbFiles+1) * sizeof(const char*));
      if (!fileTable) { free(buf); return NULL; }
  
      for (i=0, pos=0; i<nbFiles; i++) {
          fileTable[i] = buf + pos;
          pos += strlen(fileTable[i]) + 1;
      }
  
      if (buf + pos > bufend) { free(buf); free((void*)fileTable); return NULL; }
  
      *allocatedBuffer = buf;
      *allocatedNamesNb = nbFiles;
  
      return fileTable;
  }
  
  
  UTIL_STATIC void UTIL_freeFileList(const char** filenameTable, char* allocatedBuffer)
  {
      if (allocatedBuffer) free(allocatedBuffer);
      if (filenameTable) free((void*)filenameTable);
  }
  
  
  #if defined (__cplusplus)
  }
  #endif
  
  #endif /* UTIL_H_MODULE */
  