Support non-standard struct stat [Bug #17793]

On 32-bit Android:
* `st_dev`/`st_rdev` are not `dev_t`
* `st_mode` is not `mode_t`

Author: nobu

configure.ac

@@ -1693,6 +1693,7 @@ RUBY_CHECK_SIGNEDNESS(size_t, [AC_MSG_ERROR(size_t is signed)], [],
 		      [@%:@include <sys/types.h>])
 RUBY_CHECK_SIZEOF(size_t, [int long void*], [], [@%:@include <sys/types.h>])
 RUBY_CHECK_SIZEOF(ptrdiff_t, size_t, [], [@%:@include <stddef.h>])
+RUBY_CHECK_SIZEOF(dev_t)
 RUBY_CHECK_PRINTF_PREFIX(size_t, z)
 RUBY_CHECK_PRINTF_PREFIX(ptrdiff_t, t)
 AC_CHECK_MEMBERS([struct stat.st_blksize])
@@ -1703,6 +1704,10 @@ AS_IF([test "$ac_cv_member_struct_stat_st_blocks" = yes], [
     RUBY_CHECK_SIZEOF([struct stat.st_blocks], [off_t int long "long long"], [], [@%:@include <sys/stat.h>])
 ])
 RUBY_CHECK_SIZEOF([struct stat.st_ino], [long "long long"], [], [@%:@include <sys/stat.h>])
+RUBY_CHECK_SIZEOF([struct stat.st_dev], [dev_t int long "long long"], [], [@%:@include <sys/stat.h>])
+AS_IF([test "$ac_cv_member_struct_stat_st_rdev" = yes], [
+    RUBY_CHECK_SIZEOF([struct stat.st_rdev], [dev_t int long "long long"], [], [@%:@include <sys/stat.h>])
+])
 AC_CHECK_MEMBERS([struct stat.st_atim])
 AC_CHECK_MEMBERS([struct stat.st_atimespec])
 AC_CHECK_MEMBERS([struct stat.st_atimensec])

file.c

@@ -577,7 +577,13 @@ rb_stat_cmp(VALUE self, VALUE other)
 static VALUE
 rb_stat_dev(VALUE self)
 {
+#if SIZEOF_STRUCT_STAT_ST_DEV <= SIZEOF_DEV_T
     return DEVT2NUM(get_stat(self)->st_dev);
+#elif SIZEOF_STRUCT_STAT_ST_DEV <= SIZEOF_LONG
+    return ULONG2NUM(get_stat(self)->st_dev);
+#else
+    return ULL2NUM(get_stat(self)->st_dev);
+#endif
 }
 
 /*
@@ -747,7 +753,13 @@ static VALUE
 rb_stat_rdev(VALUE self)
 {
 #ifdef HAVE_STRUCT_STAT_ST_RDEV
+# if SIZEOF_STRUCT_STAT_ST_RDEV <= SIZEOF_DEV_T
     return DEVT2NUM(get_stat(self)->st_rdev);
+# elif SIZEOF_STRUCT_STAT_ST_RDEV <= SIZEOF_LONG
+    return ULONG2NUM(get_stat(self)->st_rdev);
+# else
+    return ULL2NUM(get_stat(self)->st_rdev);
+# endif
 #else
     return Qnil;
 #endif
@@ -6254,7 +6266,11 @@ path_check_0(VALUE path)
 #endif
 	    && !access(p0, W_OK)) {
 	    rb_enc_warn(enc, "Insecure world writable dir %s in PATH, mode 0%"
+#if SIZEOF_DEV_T > SIZEOF_INT
 			PRI_MODET_PREFIX"o",
+#else
+			"o",
+#endif
 			p0, st.st_mode);
 	    if (p) *p = '/';
 	    RB_GC_GUARD(path);