/* Helper functions used by strftime/strptime to handle locale-specific "eras".   Copyright (C) 1995-2001,02 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library 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   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include "../locale/localeinfo.h"#include <bits/libc-lock.h>#include <stdlib.h>#include <wchar.h>#include <string.h>/* Some of the functions here must not be used while setlocale is called.  */__libc_lock_define (extern, __libc_setlocale_lock attribute_hidden)#define CURRENT(item)		(current->values[_NL_ITEM_INDEX (item)].string)#define CURRENT_WORD(item)	(current->values[_NL_ITEM_INDEX (item)].word)#define ERA_DATE_CMP(a, b) \  (a[0] < b[0] || (a[0] == b[0] && (a[1] < b[1]				      \				    || (a[1] == b[1] && a[2] <= b[2]))))/* Look up the era information in CURRENT's locale strings and   cache it in CURRENT->private.  */static void internal_function_nl_init_era_entries (struct locale_data *current){  size_t cnt;  struct lc_time_data *data;  /* Avoid touching CURRENT if there is no data at all, for _nl_C_LC_TIME.  */  if (CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES) == 0)    return;  __libc_lock_lock (__libc_setlocale_lock);  if (current->private.time == NULL)    {      current->private.time = malloc (sizeof *current->private.time);      if (current->private.time == NULL)	goto out;      memset (current->private.time, 0, sizeof *current->private.time);      current->private.cleanup = &_nl_cleanup_time;    }  data = current->private.time;  if (! data->era_initialized)    {      size_t new_num_eras = CURRENT_WORD (_NL_TIME_ERA_NUM_ENTRIES);      if (new_num_eras == 0)	{	  if (data->eras != NULL)	    {	      free (data->eras);	      data->eras = NULL;	    }	}      else	{	  struct era_entry *new_eras = data->eras;	  if (data->num_eras != new_num_eras)	    new_eras =	      (struct era_entry *) realloc (data->eras,					    new_num_eras					    * sizeof (struct era_entry));	  if (new_eras == NULL)	    {	      free (data->eras);	      data->num_eras = 0;	      data->eras = NULL;	    }          else	    {	      const char *ptr = CURRENT (_NL_TIME_ERA_ENTRIES);	      data->num_eras = new_num_eras;	      data->eras = new_eras;	      for (cnt = 0; cnt < new_num_eras; ++cnt)		{		  const char *base_ptr = ptr;		  memcpy ((void *) (new_eras + cnt), (const void *) ptr,			  sizeof (uint32_t) * 8);		  if (ERA_DATE_CMP(new_eras[cnt].start_date,				   new_eras[cnt].stop_date))		    if (new_eras[cnt].direction == (uint32_t) '+')		      new_eras[cnt].absolute_direction = 1;		    else		      new_eras[cnt].absolute_direction = -1;		  else		    if (new_eras[cnt].direction == (uint32_t) '+')		      new_eras[cnt].absolute_direction = -1;		    else		      new_eras[cnt].absolute_direction = 1;		  /* Skip numeric values.  */		  ptr += sizeof (uint32_t) * 8;		  /* Set and skip era name.  */		  new_eras[cnt].era_name = ptr;		  ptr = strchr (ptr, '\0') + 1;		  /* Set and skip era format.  */		  new_eras[cnt].era_format = ptr;		  ptr = strchr (ptr, '\0') + 1;		  ptr += 3 - (((ptr - (const char *) base_ptr) + 3) & 3);		  /* Set and skip wide era name.  */		  new_eras[cnt].era_wname = (wchar_t *) ptr;		  ptr = (char *) (wcschr ((wchar_t *) ptr, L'\0') + 1);		  /* Set and skip wide era format.  */		  new_eras[cnt].era_wformat = (wchar_t *) ptr;		  ptr = (char *) (wcschr ((wchar_t *) ptr, L'\0') + 1);		}	    }	}      data->era_initialized = 1;    } out:  __libc_lock_unlock (__libc_setlocale_lock);}struct era_entry *internal_function_nl_get_era_entry (const struct tm *tp, struct locale_data *current){  if (current->private.time == NULL || !current->private.time->era_initialized)    _nl_init_era_entries (current);  if (current->private.time != NULL)    {      /* Now compare date with the available eras.  */      const int32_t tdate[3] = { tp->tm_year, tp->tm_mon, tp->tm_mday };      size_t cnt;      for (cnt = 0; cnt < current->private.time->num_eras; ++cnt)	if ((ERA_DATE_CMP (current->private.time->eras[cnt].start_date, tdate)	     && ERA_DATE_CMP (tdate,			      current->private.time->eras[cnt].stop_date))	    || (ERA_DATE_CMP (current->private.time->eras[cnt].stop_date,			      tdate)		&& ERA_DATE_CMP (tdate,				 current->private.time->eras[cnt].start_date)))	  return &current->private.time->eras[cnt];    }  return NULL;}struct era_entry *internal_function_nl_select_era_entry (int cnt, struct locale_data *current){  if (current->private.time == NULL || !current->private.time->era_initialized)    _nl_init_era_entries (current);  return (current->private.time == NULL	  ? NULL : &current->private.time->eras[cnt]);}