win32: use 64-bit time on 32-bit platforms

To avoid problems with dates in 2038 and beyond use 64-bit time
values on 32-bit platforms.

- Mostly this just requires a few preprocessor macros to choose
  the appropriate functions, structs and typedefs.

- We have our own implementations of nanosleep(), clock_gettime()
  and clock_settime().  Omit the Windows include file that declares
  them.

- Apply the hack for struct timeval in the 'ts' applet on 32-bit.

Adds 1624 bytes on 32-bit, none on 64-bit.

(GitHub issue #446)

3 files changed, 22 insertions, 2 deletions

diff --git a/include/libbb.h b/include/libbb.h
index e5000831f..17fb6fae6 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -10,6 +10,12 @@
 #ifndef LIBBB_H
 #define LIBBB_H 1
 
+#if ENABLE_PLATFORM_MINGW32
+/* We have our own nanosleep(), clock_gettime() and clock_settime(). */
+/* Skip the Windows include file that declares them. */
+# define WIN_PTHREADS_TIME_H
+#endif
+
 #include "platform.h"
 
 #include <ctype.h>
diff --git a/include/mingw.h b/include/mingw.h
index 7a07de619..104ca3b2e 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -2,6 +2,17 @@
 #define NOIMPL(name,...) static inline int name(__VA_ARGS__) { errno = ENOSYS; return -1; }
 #define IMPL(name,ret,retval,...) static inline ret name(__VA_ARGS__) { return retval; }
 
+/* Use 64-bit time on 32-bit platforms. */
+#if !defined(_WIN64)
+# define time_t __time64_t
+# define ctime(t) _ctime64(t)
+# define localtime(t) _localtime64(t)
+# define time(t) _time64(t)
+# define gmtime(t) _gmtime64(t)
+# define mktime(t) _mktime64(t)
+# define timespec _timespec64
+#endif
+
 /*
  * sys/types.h
  */
@@ -297,6 +308,9 @@ struct timespec {
 };
 #endif
 
+typedef int clockid_t;
+#define CLOCK_REALTIME 0
+
 time_t timegm(struct tm *tm);
 
 int nanosleep(const struct timespec *req, struct timespec *rem);
diff --git a/miscutils/ts.c b/miscutils/ts.c
index f5e727eb5..fb669b858 100644
--- a/miscutils/ts.c
+++ b/miscutils/ts.c
@@ -25,7 +25,7 @@ int ts_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ts_main(int argc UNUSED_PARAM, char **argv)
 {
         struct timeval base;
-#if ENABLE_PLATFORM_MINGW32 && !defined(_USE_32BIT_TIME_T)
+#if ENABLE_PLATFORM_MINGW32
         time_t t;
 #endif
         unsigned opt;
@@ -76,7 +76,7 @@ int ts_main(int argc UNUSED_PARAM, char **argv)
                         if (opt & 1) /* -i */
                                 base = ts1;
                 }
-#if ENABLE_PLATFORM_MINGW32 && !defined(_USE_32BIT_TIME_T)
+#if ENABLE_PLATFORM_MINGW32
                 t = ts.tv_sec;
                 localtime_r(&t, &tm_time);
 #else