1 files changed, 251 insertions, 0 deletions

diff --git a/gl/stat-time.h b/gl/stat-time.h
new file mode 100644
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--- /dev/null
+++ b/gl/stat-time.h
@@ -0,0 +1,251 @@
+/* stat-related time functions.
+
+   Copyright (C) 2005, 2007, 2009-2023 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert.  */
+
+#ifndef STAT_TIME_H
+#define STAT_TIME_H 1
+
+#include <errno.h>
+#include <stdckdint.h>
+#include <stddef.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
+_GL_INLINE_HEADER_BEGIN
+#ifndef _GL_STAT_TIME_INLINE
+# define _GL_STAT_TIME_INLINE _GL_INLINE
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type
+   struct timespec, if available.  If not, then STAT_TIMESPEC_NS (ST,
+   ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST,
+   if available.  ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim
+   for access, status change, data modification, or birth (creation)
+   time respectively.
+
+   These macros are private to stat-time.h.  */
+#if _GL_WINDOWS_STAT_TIMESPEC || defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC
+# if _GL_WINDOWS_STAT_TIMESPEC || defined TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC
+#  define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)
+# else
+#  define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec)
+# endif
+#elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC
+# define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec)
+#elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC
+# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec)
+#elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC
+# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
+#endif
+
+/* Return the nanosecond component of *ST's access time.  */
+_GL_STAT_TIME_INLINE long int _GL_ATTRIBUTE_PURE
+get_stat_atime_ns (struct stat const *st)
+{
+# if defined STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_atim).tv_nsec;
+# elif defined STAT_TIMESPEC_NS
+  return STAT_TIMESPEC_NS (st, st_atim);
+# else
+  return 0;
+# endif
+}
+
+/* Return the nanosecond component of *ST's status change time.  */
+_GL_STAT_TIME_INLINE long int _GL_ATTRIBUTE_PURE
+get_stat_ctime_ns (struct stat const *st)
+{
+# if defined STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_ctim).tv_nsec;
+# elif defined STAT_TIMESPEC_NS
+  return STAT_TIMESPEC_NS (st, st_ctim);
+# else
+  return 0;
+# endif
+}
+
+/* Return the nanosecond component of *ST's data modification time.  */
+_GL_STAT_TIME_INLINE long int _GL_ATTRIBUTE_PURE
+get_stat_mtime_ns (struct stat const *st)
+{
+# if defined STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_mtim).tv_nsec;
+# elif defined STAT_TIMESPEC_NS
+  return STAT_TIMESPEC_NS (st, st_mtim);
+# else
+  return 0;
+# endif
+}
+
+/* Return the nanosecond component of *ST's birth time.  */
+_GL_STAT_TIME_INLINE long int _GL_ATTRIBUTE_PURE
+get_stat_birthtime_ns (_GL_UNUSED struct stat const *st)
+{
+# if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
+  return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
+# elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
+  return STAT_TIMESPEC_NS (st, st_birthtim);
+# else
+  return 0;
+# endif
+}
+
+/* Return *ST's access time.  */
+_GL_STAT_TIME_INLINE struct timespec _GL_ATTRIBUTE_PURE
+get_stat_atime (struct stat const *st)
+{
+#ifdef STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_atim);
+#else
+  struct timespec t;
+  t.tv_sec = st->st_atime;
+  t.tv_nsec = get_stat_atime_ns (st);
+  return t;
+#endif
+}
+
+/* Return *ST's status change time.  */
+_GL_STAT_TIME_INLINE struct timespec _GL_ATTRIBUTE_PURE
+get_stat_ctime (struct stat const *st)
+{
+#ifdef STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_ctim);
+#else
+  struct timespec t;
+  t.tv_sec = st->st_ctime;
+  t.tv_nsec = get_stat_ctime_ns (st);
+  return t;
+#endif
+}
+
+/* Return *ST's data modification time.  */
+_GL_STAT_TIME_INLINE struct timespec _GL_ATTRIBUTE_PURE
+get_stat_mtime (struct stat const *st)
+{
+#ifdef STAT_TIMESPEC
+  return STAT_TIMESPEC (st, st_mtim);
+#else
+  struct timespec t;
+  t.tv_sec = st->st_mtime;
+  t.tv_nsec = get_stat_mtime_ns (st);
+  return t;
+#endif
+}
+
+/* Return *ST's birth time, if available; otherwise return a value
+   with tv_sec and tv_nsec both equal to -1.  */
+_GL_STAT_TIME_INLINE struct timespec _GL_ATTRIBUTE_PURE
+get_stat_birthtime (_GL_UNUSED struct stat const *st)
+{
+  struct timespec t;
+
+#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
+     || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC)
+  t = STAT_TIMESPEC (st, st_birthtim);
+#elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
+  t.tv_sec = st->st_birthtime;
+  t.tv_nsec = st->st_birthtimensec;
+#elif defined _WIN32 && ! defined __CYGWIN__
+  /* Native Windows platforms (but not Cygwin) put the "file creation
+     time" in st_ctime (!).  See
+     <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/stat-functions>.  */
+# if _GL_WINDOWS_STAT_TIMESPEC
+  t = st->st_ctim;
+# else
+  t.tv_sec = st->st_ctime;
+  t.tv_nsec = 0;
+# endif
+#else
+  /* Birth time is not supported.  */
+  t.tv_sec = -1;
+  t.tv_nsec = -1;
+#endif
+
+#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
+     || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \
+     || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
+  /* FreeBSD and NetBSD sometimes signal the absence of knowledge by
+     using zero.  Attempt to work around this problem.  Alas, this can
+     report failure even for valid timestamps.  Also, NetBSD
+     sometimes returns junk in the birth time fields; work around this
+     bug if it is detected.  */
+  if (! (t.tv_sec && 0 <= t.tv_nsec && t.tv_nsec < 1000000000))
+    {
+      t.tv_sec = -1;
+      t.tv_nsec = -1;
+    }
+#endif
+
+  return t;
+}
+
+/* If a stat-like function returned RESULT, normalize the timestamps
+   in *ST, in case this platform suffers from the Solaris 11 bug where
+   tv_nsec might be negative.  Return the adjusted RESULT, setting
+   errno to EOVERFLOW if normalization overflowed.  This function
+   is intended to be private to this .h file.  */
+_GL_STAT_TIME_INLINE int
+stat_time_normalize (int result, _GL_UNUSED struct stat *st)
+{
+#if defined __sun && defined STAT_TIMESPEC
+  if (result == 0)
+    {
+      long int timespec_hz = 1000000000;
+      short int const ts_off[] = { offsetof (struct stat, st_atim),
+                                   offsetof (struct stat, st_mtim),
+                                   offsetof (struct stat, st_ctim) };
+      int i;
+      for (i = 0; i < sizeof ts_off / sizeof *ts_off; i++)
+        {
+          struct timespec *ts = (struct timespec *) ((char *) st + ts_off[i]);
+          long int q = ts->tv_nsec / timespec_hz;
+          long int r = ts->tv_nsec % timespec_hz;
+          if (r < 0)
+            {
+              r += timespec_hz;
+              q--;
+            }
+          ts->tv_nsec = r;
+          /* Overflow is possible, as Solaris 11 stat can yield
+             tv_sec == TYPE_MINIMUM (time_t) && tv_nsec == -1000000000.
+             INT_ADD_WRAPV is OK, since time_t is signed on Solaris.  */
+          if (ckd_add (&ts->tv_sec, q, ts->tv_sec))
+            {
+              errno = EOVERFLOW;
+              return -1;
+            }
+        }
+    }
+#endif
+  return result;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+_GL_INLINE_HEADER_END
+
+#endif