sl@0: /*
sl@0: **********************************************************************
sl@0: * Copyright (c) 2003-2004, International Business Machines
sl@0: * Corporation and others.  All Rights Reserved.
sl@0: **********************************************************************
sl@0: * Author: Alan Liu
sl@0: * Created: March 19 2003
sl@0: * Since: ICU 2.6
sl@0: **********************************************************************
sl@0: */
sl@0: #ifndef UCAT_H
sl@0: #define UCAT_H
sl@0: 
sl@0: #include "unicode/utypes.h"
sl@0: #include "unicode/ures.h"
sl@0: 
sl@0: /**
sl@0:  * \file
sl@0:  * \brief C API: Message Catalog Wrappers
sl@0:  *
sl@0:  * This C API provides look-alike functions that deliberately resemble
sl@0:  * the POSIX catopen, catclose, and catgets functions.  The underlying
sl@0:  * implementation is in terms of ICU resource bundles, rather than
sl@0:  * POSIX message catalogs.
sl@0:  *
sl@0:  * The ICU resource bundles obey standard ICU inheritance policies.
sl@0:  * To facilitate this, sets and messages are flattened into one tier.
sl@0:  * This is done by creating resource bundle keys of the form
sl@0:  * <set_num>%<msg_num> where set_num is the set number and msg_num is
sl@0:  * the message number, formatted as decimal strings.
sl@0:  *
sl@0:  * Example:  Consider a message catalog containing two sets:
sl@0:  *
sl@0:  * Set 1: Message 4  = "Good morning."
sl@0:  *        Message 5  = "Good afternoon."
sl@0:  *        Message 7  = "Good evening."
sl@0:  *        Message 8  = "Good night."
sl@0:  * Set 4: Message 14 = "Please "
sl@0:  *        Message 19 = "Thank you."
sl@0:  *        Message 20 = "Sincerely,"
sl@0:  *
sl@0:  * The ICU resource bundle source file would, assuming it is named
sl@0:  * "greet.txt", would look like this:
sl@0:  *
sl@0:  * greet
sl@0:  * {
sl@0:  *     1%4  { "Good morning." }
sl@0:  *     1%5  { "Good afternoon." }
sl@0:  *     1%7  { "Good evening." }
sl@0:  *     1%8  { "Good night." }
sl@0:  * 
sl@0:  *     4%14 { "Please " }
sl@0:  *     4%19 { "Thank you." }
sl@0:  *     4%20 { "Sincerely," }
sl@0:  * }
sl@0:  *
sl@0:  * The catgets function is commonly used in combination with functions
sl@0:  * like printf and strftime.  ICU components like message format can
sl@0:  * be used instead, although they use a different format syntax.
sl@0:  * There is an ICU package, icuio, that provides some of
sl@0:  * the POSIX-style formatting API.
sl@0:  */
sl@0: 
sl@0: U_CDECL_BEGIN
sl@0: 
sl@0: /**
sl@0:  * An ICU message catalog descriptor, analogous to nl_catd.
sl@0:  * 
sl@0:  * @stable ICU 2.6
sl@0:  */
sl@0: typedef UResourceBundle* u_nl_catd;
sl@0: 
sl@0: /**
sl@0:  * Open and return an ICU message catalog descriptor. The descriptor
sl@0:  * may be passed to u_catgets() to retrieve localized strings.
sl@0:  *
sl@0:  * @param name string containing the full path pointing to the
sl@0:  * directory where the resources reside followed by the package name
sl@0:  * e.g. "/usr/resource/my_app/resources/guimessages" on a Unix system.
sl@0:  * If NULL, ICU default data files will be used.
sl@0:  *
sl@0:  * Unlike POSIX, environment variables are not interpolated within the
sl@0:  * name.
sl@0:  *
sl@0:  * @param locale the locale for which we want to open the resource. If
sl@0:  * NULL, the default ICU locale will be used (see uloc_getDefault). If
sl@0:  * strlen(locale) == 0, the root locale will be used.
sl@0:  *
sl@0:  * @param ec input/output error code. Upon output,
sl@0:  * U_USING_FALLBACK_WARNING indicates that a fallback locale was
sl@0:  * used. For example, 'de_CH' was requested, but nothing was found
sl@0:  * there, so 'de' was used. U_USING_DEFAULT_WARNING indicates that the
sl@0:  * default locale data or root locale data was used; neither the
sl@0:  * requested locale nor any of its fallback locales were found.
sl@0:  *
sl@0:  * @return a message catalog descriptor that may be passed to
sl@0:  * u_catgets(). If the ec parameter indicates success, then the caller
sl@0:  * is responsible for calling u_catclose() to close the message
sl@0:  * catalog. If the ec parameter indicates failure, then NULL will be
sl@0:  * returned.
sl@0:  * 
sl@0:  * @stable ICU 2.6
sl@0:  */
sl@0: U_STABLE u_nl_catd U_EXPORT2
sl@0: u_catopen(const char* name, const char* locale, UErrorCode* ec);
sl@0: 
sl@0: /**
sl@0:  * Close an ICU message catalog, given its descriptor.
sl@0:  *
sl@0:  * @param catd a message catalog descriptor to be closed. May be NULL,
sl@0:  * in which case no action is taken.
sl@0:  * 
sl@0:  * @stable ICU 2.6
sl@0:  */
sl@0: U_STABLE void U_EXPORT2
sl@0: u_catclose(u_nl_catd catd);
sl@0: 
sl@0: /**
sl@0:  * Retrieve a localized string from an ICU message catalog.
sl@0:  *
sl@0:  * @param catd a message catalog descriptor returned by u_catopen.
sl@0:  *
sl@0:  * @param set_num the message catalog set number. Sets need not be
sl@0:  * numbered consecutively.
sl@0:  *
sl@0:  * @param msg_num the message catalog message number within the
sl@0:  * set. Messages need not be numbered consecutively.
sl@0:  *
sl@0:  * @param s the default string. This is returned if the string
sl@0:  * specified by the set_num and msg_num is not found. It must be
sl@0:  * zero-terminated.
sl@0:  *
sl@0:  * @param len fill-in parameter to receive the length of the result.
sl@0:  * May be NULL, in which case it is ignored.
sl@0:  *
sl@0:  * @param ec input/output error code. May be U_USING_FALLBACK_WARNING
sl@0:  * or U_USING_DEFAULT_WARNING. U_MISSING_RESOURCE_ERROR indicates that
sl@0:  * the set_num/msg_num tuple does not specify a valid message string
sl@0:  * in this catalog.
sl@0:  *
sl@0:  * @return a pointer to a zero-terminated UChar array which lives in
sl@0:  * an internal buffer area, typically a memory mapped/DLL file. The
sl@0:  * caller must NOT delete this pointer. If the call is unsuccessful
sl@0:  * for any reason, then s is returned.  This includes the situation in
sl@0:  * which ec indicates a failing error code upon entry to this
sl@0:  * function.
sl@0:  * 
sl@0:  * @stable ICU 2.6
sl@0:  */
sl@0: U_STABLE const UChar* U_EXPORT2
sl@0: u_catgets(u_nl_catd catd, int32_t set_num, int32_t msg_num,
sl@0:           const UChar* s,
sl@0:           int32_t* len, UErrorCode* ec);
sl@0: 
sl@0: U_CDECL_END
sl@0: 
sl@0: #endif /*UCAT_H*/
sl@0: /*eof*/