From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 15 Mar 2005 00:39:17 +0000 (+0000)
Subject: * mktime.c (TYPE_TWOS_COMPLEMENT, TYPE_ONES_COMPLEMENT,
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f77aebf866032522e6a2c8b0d36a587f6aeccbe4;p=pspp

* mktime.c (TYPE_TWOS_COMPLEMENT, TYPE_ONES_COMPLEMENT,
TYPE_SIGNED_MAGNITUDE, TYPE_MINIMUM, TYPE_MAXIMUM): Sync from
intprops.h.
* strtol.c: Likewise.
---

diff --git a/lib/ChangeLog b/lib/ChangeLog
index 1298197b9e..1f3381790d 100644
--- a/lib/ChangeLog
+++ b/lib/ChangeLog
@@ -1,4 +1,11 @@
-2005-03-13  Simon Josefsson  <jas@extundo.com>
+2005-03-14  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* mktime.c (TYPE_TWOS_COMPLEMENT, TYPE_ONES_COMPLEMENT,
+	TYPE_SIGNED_MAGNITUDE, TYPE_MINIMUM, TYPE_MAXIMUM): Sync from
+	intprops.h.
+	* strtol.c: Likewise.
+
+2005-03-14  Simon Josefsson  <jas@extundo.com>
 
 	* timegm.h: Use proper prototype CPP guards, reported by Dave Love
 	<fx@gnu.org>.
diff --git a/lib/mktime.c b/lib/mktime.c
index 9a92cb0085..300607c4ba 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)
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)