From b1cfe3105780c2bf0283e48277ccdb56d8febea9 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Sun, 1 Dec 2002 12:04:17 +0000 Subject: (CHAR_BIT, TYPE_SIGNED, TYPE_MINIMUM, TYPE_MAXIMUM, INT_MAX): Define. --- lib/safe-read.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'lib/safe-read.c') 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 +#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 -- cgit v1.2.3-54-g00ecf