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 d556e94..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.
 
 /* Convert string representation of a number into an integer value.
 

-   Copyright (C) 1991, 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2003
+   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.
 
    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
    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,
    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
    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
 
 #ifdef _LIBC
 # define USE_NUMBER_GROUPING

+#else
+# include <config.h>

 #endif
 
 #include <ctype.h>
 #include <errno.h>
 #endif
 
 #include <ctype.h>
 #include <errno.h>

-#ifndef errno
-extern int errno;
-#endif

 #ifndef __set_errno
 # define __set_errno(Val) errno = (Val)
 #endif
 #ifndef __set_errno
 # define __set_errno(Val) errno = (Val)
 #endif


@@ -124,19 +119,34 @@ extern int errno;
 # define STRTOL_LONG_MAX LONG_LONG_MAX
 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
 
 # define STRTOL_LONG_MAX LONG_LONG_MAX
 # define STRTOL_ULONG_MAX ULONG_LONG_MAX
 

-/* The extra casts work around common compiler bugs,
-   e.g. Cray C 5.0.3.0 when t == time_t.  */
-# ifndef TYPE_SIGNED
-#  define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
-# endif
-# 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
+/* 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 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)
+
+/* 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.
+   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 ULONG_LONG_MAX
 #  define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)
 
 # ifndef ULONG_LONG_MAX
 #  define ULONG_LONG_MAX TYPE_MAXIMUM (unsigned long long)


@@ -171,15 +181,13 @@ extern int errno;
 # define _NL_CURRENT(category, item) \
   (current->values[_NL_ITEM_INDEX (item)].string)
 # define LOCALE_PARAM , loc
 # define _NL_CURRENT(category, item) \
   (current->values[_NL_ITEM_INDEX (item)].string)
 # define LOCALE_PARAM , loc

-# define LOCALE_PARAM_DECL , __locale_t loc
+# define LOCALE_PARAM_PROTO , __locale_t loc

 #else
 # define LOCALE_PARAM
 #else
 # define LOCALE_PARAM

-# define LOCALE_PARAM_DECL
+# define LOCALE_PARAM_PROTO

 #endif
 
 #endif
 

-#if defined _LIBC || defined HAVE_WCHAR_H
-# include <wchar.h>
-#endif
+#include <wchar.h>

 
 #ifdef USE_WIDE_CHAR
 # include <wctype.h>
 
 #ifdef USE_WIDE_CHAR
 # include <wctype.h>


@@ -196,11 +204,6 @@ extern int errno;
 #  define TOUPPER(Ch) towupper (Ch)
 # endif
 #else
 #  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
 # define L_(Ch) Ch
 # define UCHAR_TYPE unsigned char
 # define STRING_TYPE char


@@ -209,9 +212,9 @@ extern int errno;
 #  define ISALPHA(Ch) __isalpha_l ((Ch), loc)
 #  define TOUPPER(Ch) __toupper_l ((Ch), loc)
 # else
 #  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
 
 # endif
 #endif
 


@@ -235,7 +238,7 @@ extern int errno;
 
 INT
 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 
 INT
 INTERNAL (strtol) (const STRING_TYPE *nptr, STRING_TYPE **endptr,

-                  int base, int group LOCALE_PARAM_DECL)
+                  int base, int group LOCALE_PARAM_PROTO)

 {
   int negative;
   register unsigned LONG int cutoff;
 {
   int negative;
   register unsigned LONG int cutoff;


@@ -426,7 +429,7 @@ INT
 weak_function
 #endif
 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,
 weak_function
 #endif
 strtol (const STRING_TYPE *nptr, STRING_TYPE **endptr,

-       int base LOCALE_PARAM_DECL)
+       int base LOCALE_PARAM_PROTO)

 {
   return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
 }
 {
   return INTERNAL (strtol) (nptr, endptr, base, 0 LOCALE_PARAM);
 }