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authorJim Meyering <jim@meyering.net>2002-12-01 12:04:17 +0000
committerJim Meyering <jim@meyering.net>2002-12-01 12:04:17 +0000
commitb1cfe3105780c2bf0283e48277ccdb56d8febea9 (patch)
tree6e2ac538ff2ef890dd4a108eb28ffbeb5616eb82 /lib
parent4c6c221ee2b48595f812e58780097f79ca18506f (diff)
downloadcoreutils-b1cfe3105780c2bf0283e48277ccdb56d8febea9.tar.xz
(CHAR_BIT, TYPE_SIGNED, TYPE_MINIMUM, TYPE_MAXIMUM, INT_MAX): Define.
Diffstat (limited to 'lib')
-rw-r--r--lib/safe-read.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/safe-read.c b/lib/safe-read.c
index e4cb1d3a2..c189eb1a6 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