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author | Paul Eggert <eggert@cs.ucla.edu> | 2005-03-15 00:39:17 +0000 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2005-03-15 00:39:17 +0000 |
commit | f77aebf866032522e6a2c8b0d36a587f6aeccbe4 (patch) | |
tree | 0372857c0b39cefda49c3f8c8ce9ef9850141f81 /lib/strtol.c | |
parent | 07ee571d9e8d6540bf48b8a8ac901669ae3f4258 (diff) | |
download | gnulib-f77aebf866032522e6a2c8b0d36a587f6aeccbe4.tar.gz |
* mktime.c (TYPE_TWOS_COMPLEMENT, TYPE_ONES_COMPLEMENT,
TYPE_SIGNED_MAGNITUDE, TYPE_MINIMUM, TYPE_MAXIMUM): Sync from
intprops.h.
* strtol.c: Likewise.
Diffstat (limited to 'lib/strtol.c')
-rw-r--r-- | lib/strtol.c | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/lib/strtol.c b/lib/strtol.c index a95a765088..e4b0a2f242 100644 --- a/lib/strtol.c +++ b/lib/strtol.c @@ -127,24 +127,32 @@ extern int errno; /* The extra casts in the following macros work around compiler bugs, e.g., in Cray C 5.0.3.0. */ +/* True if negative values of the signed integer type T use twos + complement, ones complement, or signed magnitude representation, + respectively. Much GNU code assumes twos complement, but some + people like to be portable to all possible C hosts. */ +#define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1) +#define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0) +#define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1) + /* True if the arithmetic type T is signed. */ -# ifndef TYPE_SIGNED -# define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) -# endif +# define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) /* The maximum and minimum values for the integer type T. These macros have undefined behavior if T is signed and has padding bits (i.e., bits that do not contribute to the value), or if T uses signed-magnitude representation. If this is a problem for you, please let us know how to fix it for your host. */ -# ifndef TYPE_MINIMUM -# define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \ - ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) \ - : (t) 0)) -# endif -# ifndef TYPE_MAXIMUM -# define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t))) -# endif +# define TYPE_MINIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) 0 \ + : TYPE_SIGNED_MAGNITUDE (t) \ + ? ~ (t) 0 \ + : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))) +# define TYPE_MAXIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) -1 \ + : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))) # ifndef ULONG_LONG_MAX # define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long) |