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220 lines
5.7 KiB
220 lines
5.7 KiB
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2015, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: uinvchar.h
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:2
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*
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* created on: 2004sep14
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* created by: Markus W. Scherer
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*
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* Definitions for handling invariant characters, moved here from putil.c
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* for better modularization.
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*/
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#ifndef __UINVCHAR_H__
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#define __UINVCHAR_H__
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#include "unicode/utypes.h"
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#ifdef __cplusplus
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#include "unicode/unistr.h"
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#endif
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/**
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* Check if a char string only contains invariant characters.
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* See utypes.h for details.
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*
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* @param s Input string pointer.
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* @param length Length of the string, can be -1 if NUL-terminated.
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* @return true if s contains only invariant characters.
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*
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* @internal (ICU 2.8)
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*/
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U_CAPI UBool U_EXPORT2
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uprv_isInvariantString(const char *s, int32_t length);
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/**
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* Check if a Unicode string only contains invariant characters.
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* See utypes.h for details.
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*
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* @param s Input string pointer.
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* @param length Length of the string, can be -1 if NUL-terminated.
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* @return true if s contains only invariant characters.
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*
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* @internal (ICU 2.8)
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*/
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U_CAPI UBool U_EXPORT2
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uprv_isInvariantUString(const UChar *s, int32_t length);
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/**
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* \def U_UPPER_ORDINAL
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* Get the ordinal number of an uppercase invariant character
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* @internal
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*/
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define U_UPPER_ORDINAL(x) ((x)-'A')
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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# define U_UPPER_ORDINAL(x) (((x) < 'J') ? ((x)-'A') : \
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(((x) < 'S') ? ((x)-'J'+9) : \
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((x)-'S'+18)))
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#else
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# error Unknown charset family!
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#endif
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#ifdef __cplusplus
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U_NAMESPACE_BEGIN
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/**
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* Like U_UPPER_ORDINAL(x) but with validation.
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* Returns 0..25 for A..Z else a value outside 0..25.
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*/
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inline int32_t uprv_upperOrdinal(int32_t c) {
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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return c - 'A';
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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// EBCDIC: A-Z (26 letters) is split into three ranges A-I (9 letters), J-R (9), S-Z (8).
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// https://en.wikipedia.org/wiki/EBCDIC_037#Codepage_layout
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if (c <= 'I') { return c - 'A'; } // A-I --> 0-8
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if (c < 'J') { return -1; }
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if (c <= 'R') { return c - 'J' + 9; } // J-R --> 9..17
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if (c < 'S') { return -1; }
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return c - 'S' + 18; // S-Z --> 18..25
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#else
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# error Unknown charset family!
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#endif
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}
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// Like U_UPPER_ORDINAL(x) but for lowercase and with validation.
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// Returns 0..25 for a..z else a value outside 0..25.
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inline int32_t uprv_lowerOrdinal(int32_t c) {
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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return c - 'a';
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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// EBCDIC: a-z (26 letters) is split into three ranges a-i (9 letters), j-r (9), s-z (8).
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// https://en.wikipedia.org/wiki/EBCDIC_037#Codepage_layout
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if (c <= 'i') { return c - 'a'; } // a-i --> 0-8
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if (c < 'j') { return -1; }
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if (c <= 'r') { return c - 'j' + 9; } // j-r --> 9..17
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if (c < 's') { return -1; }
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return c - 's' + 18; // s-z --> 18..25
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#else
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# error Unknown charset family!
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#endif
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}
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U_NAMESPACE_END
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#endif
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/**
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* Returns true if c == '@' is possible.
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* The @ sign is variant, and the @ sign used on one
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* EBCDIC machine won't be compiled the same way on other EBCDIC based machines.
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* @internal
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*/
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U_CFUNC UBool
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uprv_isEbcdicAtSign(char c);
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/**
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* \def uprv_isAtSign
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* Returns true if c == '@' is possible.
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* For ASCII, checks for exactly '@'. For EBCDIC, calls uprv_isEbcdicAtSign().
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* @internal
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*/
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define uprv_isAtSign(c) ((c)=='@')
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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# define uprv_isAtSign(c) uprv_isEbcdicAtSign(c)
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#else
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# error Unknown charset family!
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#endif
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/**
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* Compare two EBCDIC invariant-character strings in ASCII order.
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* @internal
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*/
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U_CAPI int32_t U_EXPORT2
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uprv_compareInvEbcdicAsAscii(const char *s1, const char *s2);
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/**
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* \def uprv_compareInvCharsAsAscii
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* Compare two invariant-character strings in ASCII order.
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* @internal
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*/
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define uprv_compareInvCharsAsAscii(s1, s2) uprv_strcmp(s1, s2)
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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# define uprv_compareInvCharsAsAscii(s1, s2) uprv_compareInvEbcdicAsAscii(s1, s2)
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#else
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# error Unknown charset family!
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#endif
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/**
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* Converts an EBCDIC invariant character to ASCII.
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* @internal
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*/
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U_CAPI char U_EXPORT2
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uprv_ebcdicToAscii(char c);
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/**
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* \def uprv_invCharToAscii
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* Converts an invariant character to ASCII.
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* @internal
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*/
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define uprv_invCharToAscii(c) (c)
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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# define uprv_invCharToAscii(c) uprv_ebcdicToAscii(c)
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#else
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# error Unknown charset family!
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#endif
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/**
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* Converts an EBCDIC invariant character to lowercase ASCII.
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* @internal
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*/
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U_CAPI char U_EXPORT2
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uprv_ebcdicToLowercaseAscii(char c);
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/**
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* \def uprv_invCharToLowercaseAscii
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* Converts an invariant character to lowercase ASCII.
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* @internal
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*/
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#if U_CHARSET_FAMILY==U_ASCII_FAMILY
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# define uprv_invCharToLowercaseAscii uprv_asciitolower
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#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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# define uprv_invCharToLowercaseAscii uprv_ebcdicToLowercaseAscii
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#else
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# error Unknown charset family!
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#endif
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/**
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* Copy EBCDIC to ASCII
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* @internal
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* @see uprv_strncpy
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*/
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U_CAPI uint8_t* U_EXPORT2
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uprv_aestrncpy(uint8_t *dst, const uint8_t *src, int32_t n);
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/**
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* Copy ASCII to EBCDIC
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* @internal
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* @see uprv_strncpy
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*/
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U_CAPI uint8_t* U_EXPORT2
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uprv_eastrncpy(uint8_t *dst, const uint8_t *src, int32_t n);
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#endif
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