kc3-lang/gnulib/lib/c-strtod.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/c-strtod.c

• /* Convert string to double, using the C locale.
  
     Copyright (C) 2003-2004, 2006, 2009-2023 Free Software Foundation, Inc.
  
     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 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
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     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, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include "c-strtod.h"
  
  #include <errno.h>
  #include <locale.h>
  #include <stdlib.h>
  #include <string.h>
  
  #if LONG
  # define C_STRTOD c_strtold
  # define DOUBLE long double
  # define STRTOD_L strtold_l
  # define HAVE_GOOD_STRTOD_L (HAVE_STRTOLD_L && !GNULIB_defined_strtold_function)
  # define STRTOD strtold
  #else
  # define C_STRTOD c_strtod
  # define DOUBLE double
  # define STRTOD_L strtod_l
  # define HAVE_GOOD_STRTOD_L (HAVE_STRTOD_L && !GNULIB_defined_strtod_function)
  # define STRTOD strtod
  #endif
  
  #if defined LC_ALL_MASK \
      && ((LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L) \
          || HAVE_WORKING_USELOCALE)
  
  /* 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 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)
  {
    DOUBLE r;
  
  #if defined LC_ALL_MASK \
      && ((LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L) \
          || HAVE_WORKING_USELOCALE)
  
    locale_t locale = c_locale ();
    if (!locale)
      {
        if (endptr)
          *endptr = (char *) nptr;
        return 0; /* errno is set here */
      }
  
  # if (LONG ? HAVE_GOOD_STRTOLD_L : HAVE_GOOD_STRTOD_L)
  
    r = STRTOD_L (nptr, endptr, locale);
  
  # else /* HAVE_WORKING_USELOCALE */
  
    locale_t old_locale = uselocale (locale);
    if (old_locale == (locale_t)0)
      {
        if (endptr)
          *endptr = (char *) nptr;
        return 0; /* errno is set here */
      }
  
    r = STRTOD (nptr, endptr);
  
    int saved_errno = errno;
    if (uselocale (old_locale) == (locale_t)0)
      /* We can't switch back to the old locale.  The thread is hosed.  */
      abort ();
    errno = saved_errno;
  
  # endif
  
  #else
  
    char *saved_locale = setlocale (LC_NUMERIC, NULL);
  
    if (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");
      }
  
    r = STRTOD (nptr, endptr);
  
    if (saved_locale)
      {
        int saved_errno = errno;
  
        setlocale (LC_NUMERIC, saved_locale);
        free (saved_locale);
        errno = saved_errno;
      }
  
  #endif
  
    return r;
  }
  

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