diff options
| -rw-r--r-- | lib/safe-read.c | 16 |
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 |