nl_langinfo.c

用于嵌入式Linux系统的标准C的库函数

/*-
 * Copyright (c) 2001 Alexey Zelkin <[e-mail]>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>

#include <locale.h>
#include <langinfo.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include "timelocal.h"
#include "lnumeric.h"
#include "lmonetary.h"
#include "lmessages.h"

#define TRANSITION_PERIOD_HACK

#define _REL(BASE) ((int)item-BASE)

char *
_DEFUN(nl_langinfo, (item), 
       nl_item item) {

   char *ret, *s, *cs;
   static char *csym = NULL;
#ifdef TRANSITION_PERIOD_HACK
   static char *cset = NULL;
#endif /* TRANSITION_PERIOD_HACK */
   char *nptr;

   switch (item) {
	case CODESET:
		ret = "";
		if ((s = setlocale(LC_CTYPE, NULL)) != NULL) {
			if ((cs = strchr(s, '.')) != NULL) {
				ret = cs + 1;
#ifdef TRANSITION_PERIOD_HACK
				if (strncmp(ret, "ISO_", 4) == 0) {
					int slen = strlen(ret);

                                        nptr = realloc(cset, slen);

                                        if (!nptr && cset)
                                          free (cset);

                                        cset = nptr;
					if (cset != NULL) {
						strcpy(cset, "ISO");
						strcat(cset, ret + 4);
						ret = cset;
					} else
						ret = "";
				} else if (strcmp(ret, "EUC") == 0) {
					if (strncmp(s, "ja_JP", 5) == 0)
						ret = "eucJP";
					else if (strncmp(s, "ko_KR", 5) == 0)
						ret = "eucKR";
					else if (strncmp(s, "zh_CN", 5) == 0)
						ret = "eucCN";
				} else if (strcmp(ret, "ASCII") == 0)
					ret = "US-ASCII";
#endif /* TRANSITION_PERIOD_HACK */
			} else if (strcmp(s, "C") == 0 ||
				   strcmp(s, "POSIX") == 0
#ifdef TRANSITION_PERIOD_HACK
				   || strstr(s, "ASCII") != NULL
#endif /* TRANSITION_PERIOD_HACK */
				  )
				ret = "US-ASCII";
		}
		break;
	case D_T_FMT:
		ret = (char *) __get_current_time_locale()->c_fmt;
		break;
	case D_FMT:
		ret = (char *) __get_current_time_locale()->x_fmt;
		break;
	case T_FMT:
		ret = (char *) __get_current_time_locale()->X_fmt;
		break;
	case T_FMT_AMPM:
		ret = (char *) __get_current_time_locale()->ampm_fmt;
		break;
	case AM_STR:
		ret = (char *) __get_current_time_locale()->am;
		break;
	case PM_STR:
		ret = (char *) __get_current_time_locale()->pm;
		break;
	case DAY_1: case DAY_2: case DAY_3:
	case DAY_4: case DAY_5: case DAY_6: case DAY_7:
		ret = (char*) __get_current_time_locale()->weekday[_REL(DAY_1)];
		break;
	case ABDAY_1: case ABDAY_2: case ABDAY_3:
	case ABDAY_4: case ABDAY_5: case ABDAY_6: case ABDAY_7:
		ret = (char*) __get_current_time_locale()->wday[_REL(ABDAY_1)];
		break;
	case MON_1: case MON_2: case MON_3: case MON_4:
	case MON_5: case MON_6: case MON_7: case MON_8:
	case MON_9: case MON_10: case MON_11: case MON_12:
		ret = (char*) __get_current_time_locale()->month[_REL(MON_1)];
		break;
	case ABMON_1: case ABMON_2: case ABMON_3: case ABMON_4:
	case ABMON_5: case ABMON_6: case ABMON_7: case ABMON_8:
	case ABMON_9: case ABMON_10: case ABMON_11: case ABMON_12:
		ret = (char*) __get_current_time_locale()->mon[_REL(ABMON_1)];
		break;
	case ERA:
		/* XXX: need to be implemented  */
		ret = "";
		break;
	case ERA_D_FMT:
		/* XXX: need to be implemented  */
		ret = "";
		break;
	case ERA_D_T_FMT:
		/* XXX: need to be implemented  */
		ret = "";
		break;
	case ERA_T_FMT:
		/* XXX: need to be implemented  */
		ret = "";
		break;
	case ALT_DIGITS:
		/* XXX: need to be implemented  */
		ret = "";
		break;
	case RADIXCHAR:
		ret = (char*) __get_current_numeric_locale()->decimal_point;
		break;
	case THOUSEP:
		ret = (char*) __get_current_numeric_locale()->thousands_sep;
		break;
	case YESEXPR:
		ret = (char*) __get_current_messages_locale()->yesexpr;
		break;
	case NOEXPR:
		ret = (char*) __get_current_messages_locale()->noexpr;
		break;
	/*
	 * All items marked with LEGACY are available, but not recomended
	 * by SUSv2 to be used in portable applications since they're subject
	 * to remove in future specification editions
	 */
	case YESSTR:            /* LEGACY  */
		ret = (char*) __get_current_messages_locale()->yesstr;
		break;
	case NOSTR:             /* LEGACY  */
		ret = (char*) __get_current_messages_locale()->nostr;
		break;
	case CRNCYSTR:
		ret = "";
		cs = (char*) __get_current_monetary_locale()->currency_symbol;
		if (*cs != '\0') {
			char pos = localeconv()->p_cs_precedes;

			if (pos == localeconv()->n_cs_precedes) {
				char psn = '\0';

				if (pos == CHAR_MAX) {
					if (strcmp(cs, __get_current_monetary_locale()->mon_decimal_point) == 0)
						psn = '.';
				} else
					psn = pos ? '-' : '+';
				if (psn != '\0') {
					int clen = strlen(cs);

                                        nptr = realloc(csym, clen + 2);
                                        if (!nptr && csym)
                                          free (csym);

                                        csym = nptr;

					if (csym != NULL) {
						*csym = psn;
						strcpy(csym + 1, cs);
						ret = csym;
					}
				}
			}
		}
		break;
	case D_MD_ORDER:        /* local extension */
		ret = (char *) __get_current_time_locale()->md_order;
		break;
	default:
		ret = "";
   }
   return (ret);
}