Sync with the latest Gnulib code (177f525)

[nagiosplug.git] / gl / c-strtod.c

diff --git a/gl/c-strtod.c b/gl/c-strtod.c
index 2234ed0f8d495397029db23a356ca0b18f7f5053..38d472bd2501e8d4e46f62e7038b084564bc15e7 100644 (file)
--- a/gl/c-strtod.c
+++ b/gl/c-strtod.c
@@ -1,11 +1,11 @@
 /* Convert string to double, using the C locale.
 
-   Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2003-2004, 2006, 2009-2010 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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 later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,8 +13,7 @@
    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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
@@ -22,10 +21,10 @@
 
 #include "c-strtod.h"
 
+#include <errno.h>
 #include <locale.h>
 #include <stdlib.h>
-
-#include "xalloc.h"
+#include <string.h>
 
 #if LONG
 # define C_STRTOD c_strtold
@@ -44,6 +43,25 @@
 # define STRTOD strtod
 #endif
 
+#ifdef LC_ALL_MASK
+
+/* Cache for the C locale object.
+   Marked volatile so that different threads see the same value
+   (avoids locking).  */
+static volatile locale_t c_locale_cache;
+
+/* Return the C locale object, or (locale_t) 0 with errno set
+   if it cannot be created.  */
+static inline locale_t
+c_locale (void)
+{
+  if (!c_locale_cache)
+    c_locale_cache = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
+  return c_locale_cache;
+}
+
+#endif
+
 DOUBLE
 C_STRTOD (char const *nptr, char **endptr)
 {
@@ -51,9 +69,15 @@ C_STRTOD (char const *nptr, char **endptr)
 
 #ifdef LC_ALL_MASK
 
-  locale_t c_locale = newlocale (LC_ALL_MASK, "C", 0);
-  r = STRTOD_L (nptr, endptr, c_locale);
-  freelocale (c_locale);
+  locale_t locale = c_locale ();
+  if (!locale)
+    {
+      if (endptr)
+        *endptr = (char *) nptr;
+      return 0; /* errno is set here */
+    }
+
+  r = STRTOD_L (nptr, endptr, locale);
 
 #else
 
@@ -61,7 +85,13 @@ C_STRTOD (char const *nptr, char **endptr)
 
   if (saved_locale)
     {
-      saved_locale = xstrdup (saved_locale);
+      saved_locale = strdup (saved_locale);
+      if (saved_locale == NULL)
+        {
+          if (endptr)
+            *endptr = (char *) nptr;
+          return 0; /* errno is set here */
+        }
       setlocale (LC_NUMERIC, "C");
     }
 
@@ -69,8 +99,11 @@ C_STRTOD (char const *nptr, char **endptr)
 
   if (saved_locale)
     {
+      int saved_errno = errno;
+
       setlocale (LC_NUMERIC, saved_locale);
       free (saved_locale);
+      errno = saved_errno;
     }
 
 #endif