Don't rely on excess precision: -4 > -3.00000024 - 1 can evaluate to false

[gnulib.git] / lib / strtol.c

diff --git a/lib/strtol.c b/lib/strtol.c
index e4b0a2f..0b2c82a 100644 (file)
--- a/lib/strtol.c
+++ b/lib/strtol.c
@@ -1,14 +1,15 @@
 /* Convert string representation of a number into an integer value.
 
-   Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003, 2005
+   Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003, 2005,
+   2006, 2007
    Free Software Foundation, Inc.
 
    NOTE: The canonical source of this file is maintained with the GNU C
    Library.  Bugs can be reported to bug-glibc@gnu.org.
 
-   This program is free software; you can redistribute it and/or modify it
+   This program is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
-   Free Software Foundation; either version 2, or (at your option) any
+   Free Software Foundation; either version 3 of the License, or any
    later version.
 
    This program is distributed in the hope that it will be useful,
@@ -17,22 +18,16 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
-
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifdef _LIBC
 # define USE_NUMBER_GROUPING
+#else
+# include <config.h>
 #endif
 
 #include <ctype.h>
 #include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
 #ifndef __set_errno
 # define __set_errno(Val) errno = (Val)
 #endif
@@ -127,22 +122,21 @@ 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
+/* True if negative values of the signed integer type T use two's
+   complement, ones' complement, or signed magnitude representation,
+   respectively.  Much GNU code assumes two's 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)
+# 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.  */
+   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 \
@@ -193,9 +187,7 @@ extern int errno;
 # define LOCALE_PARAM_PROTO
 #endif
 
-#if defined _LIBC || defined HAVE_WCHAR_H
-# include <wchar.h>
-#endif
+#include <wchar.h>
 
 #ifdef USE_WIDE_CHAR
 # include <wctype.h>
@@ -212,11 +204,6 @@ extern int errno;
 #  define TOUPPER(Ch) towupper (Ch)
 # endif
 #else
-# if defined STDC_HEADERS || (!defined isascii && !defined HAVE_ISASCII)
-#  define IN_CTYPE_DOMAIN(c) 1
-# else
-#  define IN_CTYPE_DOMAIN(c) isascii(c)
-# endif
 # define L_(Ch) Ch
 # define UCHAR_TYPE unsigned char
 # define STRING_TYPE char
@@ -225,9 +212,9 @@ extern int errno;
 #  define ISALPHA(Ch) __isalpha_l ((Ch), loc)
 #  define TOUPPER(Ch) __toupper_l ((Ch), loc)
 # else
-#  define ISSPACE(Ch) (IN_CTYPE_DOMAIN (Ch) && isspace (Ch))
-#  define ISALPHA(Ch) (IN_CTYPE_DOMAIN (Ch) && isalpha (Ch))
-#  define TOUPPER(Ch) (IN_CTYPE_DOMAIN (Ch) ? toupper (Ch) : (Ch))
+#  define ISSPACE(Ch) isspace (Ch)
+#  define ISALPHA(Ch) isalpha (Ch)
+#  define TOUPPER(Ch) toupper (Ch)
 # endif
 #endif