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author | Paul Eggert <eggert@cs.ucla.edu> | 2005-03-15 00:40:17 +0000 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2005-03-15 00:40:17 +0000 |
commit | 53d430be4ed31bb7ad94fa2b7676ecc889d447e2 (patch) | |
tree | dea23dc12eeb3a5d6108f58ee0b10cd984c1e005 /lib/mktime.c | |
parent | 2f82566ff2228a7d96d58d378fb6070d849124f1 (diff) | |
download | coreutils-53d430be4ed31bb7ad94fa2b7676ecc889d447e2.tar.xz |
Sync mktime.c and strtol.c macros from intprops.h.
Diffstat (limited to 'lib/mktime.c')
-rw-r--r-- | lib/mktime.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/lib/mktime.c b/lib/mktime.c index 9a92cb008..300607c4b 100644 --- a/lib/mktime.c +++ b/lib/mktime.c @@ -68,21 +68,31 @@ an integer. */ #define TYPE_IS_INTEGER(t) ((t) 1.5 == 1) -/* True if negative values of the integer type T use twos complement - representation. */ -#define TYPE_TWOS_COMPLEMENT(t) ((t) - (t) 1 == (t) ((t) ~ (t) 1 + (t) 1)) +/* 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. */ #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. */ -#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))) + macros have undefined behavior if T is signed and has padding bits. + If this is a problem for you, please let us know how to fix it for + your host. */ +#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 TIME_T_MIN # define TIME_T_MIN TYPE_MINIMUM (time_t) |