From: Jim Meyering <jim@meyering.net>
Date: Sun, 1 Dec 2002 12:04:17 +0000 (+0000)
Subject: (CHAR_BIT, TYPE_SIGNED, TYPE_MINIMUM, TYPE_MAXIMUM, INT_MAX): Define.
X-Git-Tag: v4.5.4~94
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1cfe3105780c2bf0283e48277ccdb56d8febea9;p=thirdparty%2Fcoreutils.git

(CHAR_BIT, TYPE_SIGNED, TYPE_MINIMUM, TYPE_MAXIMUM, INT_MAX): Define.
---

diff --git a/lib/safe-read.c b/lib/safe-read.c
index e4cb1d3a2a..c189eb1a63 100644
--- a/lib/safe-read.c
+++ b/lib/safe-read.c
@@ -35,6 +35,22 @@ extern int errno;
 
 #include <limits.h>
 
+#ifndef CHAR_BIT
+# define CHAR_BIT 8
+#endif
+
+/* The extra casts work around common compiler bugs.  */
+#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
+/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
+   It is necessary at least when t == time_t.  */
+#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
+			      ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
+#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
+
+#ifndef INT_MAX
+# define INT_MAX TYPE_MAXIMUM (int)
+#endif
+
 /* We don't pass an nbytes count > SSIZE_MAX to read() - POSIX says the
    effect would be implementation-defined.  Also we don't pass an nbytes
    count > INT_MAX but <= SSIZE_MAX to read() - this triggers a bug in