path: root/contrib/libs/icu/common/uinvchar.cpp

// © 2016 and later: Unicode, Inc. and others. 
// License & terms of use: http://www.unicode.org/copyright.html 
/* 
******************************************************************************* 
* 
*   Copyright (C) 1999-2010, International Business Machines 
*   Corporation and others.  All Rights Reserved. 
* 
******************************************************************************* 
*   file name:  uinvchar.c 
*   encoding:   UTF-8 
*   tab size:   8 (not used) 
*   indentation:2 
* 
*   created on: 2004sep14 
*   created by: Markus W. Scherer 
* 
*   Functions for handling invariant characters, moved here from putil.c 
*   for better modularization. 
*/ 
 
#include "unicode/utypes.h" 
#include "unicode/ustring.h" 
#include "udataswp.h" 
#include "cstring.h" 
#include "cmemory.h" 
#include "uassert.h" 
#include "uinvchar.h" 
 
/* invariant-character handling --------------------------------------------- */ 
 
/* 
 * These maps for ASCII to/from EBCDIC map invariant characters (see utypes.h) 
 * appropriately for most EBCDIC codepages. 
 * 
 * They currently also map most other ASCII graphic characters, 
 * appropriately for codepages 37 and 1047. 
 * Exceptions: The characters for []^ have different codes in 37 & 1047. 
 * Both versions are mapped to ASCII. 
 * 
 *    ASCII 37 1047 
 * [     5B BA   AD 
 * ]     5D BB   BD 
 * ^     5E B0   5F 
 * 
 * There are no mappings for variant characters from Unicode to EBCDIC. 
 * 
 * Currently, C0 control codes are also included in these maps. 
 * Exceptions: S/390 Open Edition swaps LF and NEL codes compared with other 
 * EBCDIC platforms; both codes (15 and 25) are mapped to ASCII LF (0A), 
 * but there is no mapping for ASCII LF back to EBCDIC. 
 * 
 *    ASCII EBCDIC S/390-OE 
 * LF    0A     25       15 
 * NEL   85     15       25 
 * 
 * The maps below explicitly exclude the variant 
 * control and graphical characters that are in ASCII-based 
 * codepages at 0x80 and above. 
 * "No mapping" is expressed by mapping to a 00 byte. 
 * 
 * These tables do not establish a converter or a codepage. 
 */ 
 
static const uint8_t asciiFromEbcdic[256]={ 
    0x00, 0x01, 0x02, 0x03, 0x00, 0x09, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 
    0x10, 0x11, 0x12, 0x13, 0x00, 0x0a, 0x08, 0x00, 0x18, 0x19, 0x00, 0x00, 0x1c, 0x1d, 0x1e, 0x1f, 
    0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x17, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07, 
    0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x00, 0x1a, 
 
    0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2e, 0x3c, 0x28, 0x2b, 0x7c, 
    0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x5e, 
    0x2d, 0x2f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x25, 0x5f, 0x3e, 0x3f, 
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22, 
 
    0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x00, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x00, 0x7e, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x00, 0x00, 0x00, 0x5b, 0x00, 0x00, 
    0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5b, 0x5d, 0x00, 0x5d, 0x00, 0x00, 
 
    0x7b, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x7d, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x5c, 0x00, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 
}; 
 
static const uint8_t ebcdicFromAscii[256]={ 
    0x00, 0x01, 0x02, 0x03, 0x37, 0x2d, 0x2e, 0x2f, 0x16, 0x05, 0x00, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 
    0x10, 0x11, 0x12, 0x13, 0x3c, 0x3d, 0x32, 0x26, 0x18, 0x19, 0x3f, 0x27, 0x1c, 0x1d, 0x1e, 0x1f, 
    0x40, 0x00, 0x7f, 0x00, 0x00, 0x6c, 0x50, 0x7d, 0x4d, 0x5d, 0x5c, 0x4e, 0x6b, 0x60, 0x4b, 0x61, 
    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0x7a, 0x5e, 0x4c, 0x7e, 0x6e, 0x6f, 
 
    0x00, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 
    0xd7, 0xd8, 0xd9, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0x00, 0x00, 0x00, 0x00, 0x6d, 
    0x00, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 
    0x97, 0x98, 0x99, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0x00, 0x00, 0x00, 0x00, 0x07, 
 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 
}; 
 
/* Same as asciiFromEbcdic[] except maps all letters to lowercase. */ 
static const uint8_t lowercaseAsciiFromEbcdic[256]={ 
    0x00, 0x01, 0x02, 0x03, 0x00, 0x09, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 
    0x10, 0x11, 0x12, 0x13, 0x00, 0x0a, 0x08, 0x00, 0x18, 0x19, 0x00, 0x00, 0x1c, 0x1d, 0x1e, 0x1f, 
    0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x17, 0x1b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x06, 0x07, 
    0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x00, 0x1a, 
 
    0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2e, 0x3c, 0x28, 0x2b, 0x7c, 
    0x26, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x5e, 
    0x2d, 0x2f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2c, 0x25, 0x5f, 0x3e, 0x3f, 
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22, 
 
    0x00, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x00, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x00, 0x7e, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x00, 0x00, 0x00, 0x5b, 0x00, 0x00, 
    0x5e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5b, 0x5d, 0x00, 0x5d, 0x00, 0x00, 
 
    0x7b, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x7d, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x7c, 0x00, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 
}; 
 
/* 
 * Bit sets indicating which characters of the ASCII repertoire 
 * (by ASCII/Unicode code) are "invariant". 
 * See utypes.h for more details. 
 * 
 * As invariant are considered the characters of the ASCII repertoire except 
 * for the following: 
 * 21  '!' <exclamation mark> 
 * 23  '#' <number sign> 
 * 24  '$' <dollar sign> 
 * 
 * 40  '@' <commercial at> 
 * 
 * 5b  '[' <left bracket> 
 * 5c  '\' <backslash> 
 * 5d  ']' <right bracket> 
 * 5e  '^' <circumflex> 
 * 
 * 60  '`' <grave accent> 
 * 
 * 7b  '{' <left brace> 
 * 7c  '|' <vertical line> 
 * 7d  '}' <right brace> 
 * 7e  '~' <tilde> 
 */ 
static const uint32_t invariantChars[4]={ 
    0xfffffbff, /* 00..1f but not 0a */ 
    0xffffffe5, /* 20..3f but not 21 23 24 */ 
    0x87fffffe, /* 40..5f but not 40 5b..5e */ 
    0x87fffffe  /* 60..7f but not 60 7b..7e */ 
}; 
 
/* 
 * test unsigned types (or values known to be non-negative) for invariant characters, 
 * tests ASCII-family character values 
 */ 
#define UCHAR_IS_INVARIANT(c) (((c)<=0x7f) && (invariantChars[(c)>>5]&((uint32_t)1<<((c)&0x1f)))!=0) 
 
/* test signed types for invariant characters, adds test for positive values */ 
#define SCHAR_IS_INVARIANT(c) ((0<=(c)) && UCHAR_IS_INVARIANT(c)) 
 
#if U_CHARSET_FAMILY==U_ASCII_FAMILY 
#define CHAR_TO_UCHAR(c) c 
#define UCHAR_TO_CHAR(c) c 
#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY 
#define CHAR_TO_UCHAR(u) asciiFromEbcdic[u] 
#define UCHAR_TO_CHAR(u) ebcdicFromAscii[u] 
#else 
#   error U_CHARSET_FAMILY is not valid 
#endif 
 
 
U_CAPI void U_EXPORT2 
u_charsToUChars(const char *cs, UChar *us, int32_t length) { 
    UChar u; 
    uint8_t c; 
 
    /* 
     * Allow the entire ASCII repertoire to be mapped _to_ Unicode. 
     * For EBCDIC systems, this works for characters with codes from 
     * codepages 37 and 1047 or compatible. 
     */ 
    while(length>0) { 
        c=(uint8_t)(*cs++); 
        u=(UChar)CHAR_TO_UCHAR(c); 
        U_ASSERT((u!=0 || c==0)); /* only invariant chars converted? */ 
        *us++=u; 
        --length; 
    } 
} 
 
U_CAPI void U_EXPORT2 
u_UCharsToChars(const UChar *us, char *cs, int32_t length) { 
    UChar u; 
 
    while(length>0) { 
        u=*us++; 
        if(!UCHAR_IS_INVARIANT(u)) { 
            U_ASSERT(FALSE); /* Variant characters were used. These are not portable in ICU. */ 
            u=0; 
        } 
        *cs++=(char)UCHAR_TO_CHAR(u); 
        --length; 
    } 
} 
 
U_CAPI UBool U_EXPORT2 
uprv_isInvariantString(const char *s, int32_t length) { 
    uint8_t c; 
 
    for(;;) { 
        if(length<0) { 
            /* NUL-terminated */ 
            c=(uint8_t)*s++; 
            if(c==0) { 
                break; 
            } 
        } else { 
            /* count length */ 
            if(length==0) { 
                break; 
            } 
            --length; 
            c=(uint8_t)*s++; 
            if(c==0) { 
                continue; /* NUL is invariant */ 
            } 
        } 
        /* c!=0 now, one branch below checks c==0 for variant characters */ 
 
        /* 
         * no assertions here because these functions are legitimately called 
         * for strings with variant characters 
         */ 
#if U_CHARSET_FAMILY==U_ASCII_FAMILY 
        if(!UCHAR_IS_INVARIANT(c)) { 
            return FALSE; /* found a variant char */ 
        } 
#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY 
        c=CHAR_TO_UCHAR(c); 
        if(c==0 || !UCHAR_IS_INVARIANT(c)) { 
            return FALSE; /* found a variant char */ 
        } 
#else 
#   error U_CHARSET_FAMILY is not valid 
#endif 
    } 
    return TRUE; 
} 
 
U_CAPI UBool U_EXPORT2 
uprv_isInvariantUString(const UChar *s, int32_t length) { 
    UChar c; 
 
    for(;;) { 
        if(length<0) { 
            /* NUL-terminated */ 
            c=*s++; 
            if(c==0) { 
                break; 
            } 
        } else { 
            /* count length */ 
            if(length==0) { 
                break; 
            } 
            --length; 
            c=*s++; 
        } 
 
        /* 
         * no assertions here because these functions are legitimately called 
         * for strings with variant characters 
         */ 
        if(!UCHAR_IS_INVARIANT(c)) { 
            return FALSE; /* found a variant char */ 
        } 
    } 
    return TRUE; 
} 
 
/* UDataSwapFn implementations used in udataswp.c ------- */ 
 
/* convert ASCII to EBCDIC and verify that all characters are invariant */ 
U_CAPI int32_t U_EXPORT2 
uprv_ebcdicFromAscii(const UDataSwapper *ds, 
                     const void *inData, int32_t length, void *outData, 
                     UErrorCode *pErrorCode) { 
    const uint8_t *s; 
    uint8_t *t; 
    uint8_t c; 
 
    int32_t count; 
 
    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) { 
        return 0; 
    } 
    if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) { 
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; 
        return 0; 
    } 
 
    /* setup and swapping */ 
    s=(const uint8_t *)inData; 
    t=(uint8_t *)outData; 
    count=length; 
    while(count>0) { 
        c=*s++; 
        if(!UCHAR_IS_INVARIANT(c)) { 
            udata_printError(ds, "uprv_ebcdicFromAscii() string[%d] contains a variant character in position %d\n", 
                             length, length-count); 
            *pErrorCode=U_INVALID_CHAR_FOUND; 
            return 0; 
        } 
        *t++=ebcdicFromAscii[c]; 
        --count; 
    } 
 
    return length; 
} 
 
/* this function only checks and copies ASCII strings without conversion */ 
U_CFUNC int32_t 
uprv_copyAscii(const UDataSwapper *ds, 
               const void *inData, int32_t length, void *outData, 
               UErrorCode *pErrorCode) { 
    const uint8_t *s; 
    uint8_t c; 
 
    int32_t count; 
 
    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) { 
        return 0; 
    } 
    if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) { 
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; 
        return 0; 
    } 
 
    /* setup and checking */ 
    s=(const uint8_t *)inData; 
    count=length; 
    while(count>0) { 
        c=*s++; 
        if(!UCHAR_IS_INVARIANT(c)) { 
            udata_printError(ds, "uprv_copyFromAscii() string[%d] contains a variant character in position %d\n", 
                             length, length-count); 
            *pErrorCode=U_INVALID_CHAR_FOUND; 
            return 0; 
        } 
        --count; 
    } 
 
    if(length>0 && inData!=outData) { 
        uprv_memcpy(outData, inData, length); 
    } 
 
    return length; 
} 
 
/* convert EBCDIC to ASCII and verify that all characters are invariant */ 
U_CFUNC int32_t 
uprv_asciiFromEbcdic(const UDataSwapper *ds, 
                     const void *inData, int32_t length, void *outData, 
                     UErrorCode *pErrorCode) { 
    const uint8_t *s; 
    uint8_t *t; 
    uint8_t c; 
 
    int32_t count; 
 
    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) { 
        return 0; 
    } 
    if(ds==NULL || inData==NULL || length<0 ||  (length>0 && outData==NULL)) { 
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; 
        return 0; 
    } 
 
    /* setup and swapping */ 
    s=(const uint8_t *)inData; 
    t=(uint8_t *)outData; 
    count=length; 
    while(count>0) { 
        c=*s++; 
        if(c!=0 && ((c=asciiFromEbcdic[c])==0 || !UCHAR_IS_INVARIANT(c))) { 
            udata_printError(ds, "uprv_asciiFromEbcdic() string[%d] contains a variant character in position %d\n", 
                             length, length-count); 
            *pErrorCode=U_INVALID_CHAR_FOUND; 
            return 0; 
        } 
        *t++=c; 
        --count; 
    } 
 
    return length; 
} 
 
/* this function only checks and copies EBCDIC strings without conversion */ 
U_CFUNC int32_t 
uprv_copyEbcdic(const UDataSwapper *ds, 
                const void *inData, int32_t length, void *outData, 
                UErrorCode *pErrorCode) { 
    const uint8_t *s; 
    uint8_t c; 
 
    int32_t count; 
 
    if(pErrorCode==NULL || U_FAILURE(*pErrorCode)) { 
        return 0; 
    } 
    if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) { 
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; 
        return 0; 
    } 
 
    /* setup and checking */ 
    s=(const uint8_t *)inData; 
    count=length; 
    while(count>0) { 
        c=*s++; 
        if(c!=0 && ((c=asciiFromEbcdic[c])==0 || !UCHAR_IS_INVARIANT(c))) { 
            udata_printError(ds, "uprv_copyEbcdic() string[%] contains a variant character in position %d\n", 
                             length, length-count); 
            *pErrorCode=U_INVALID_CHAR_FOUND; 
            return 0; 
        } 
        --count; 
    } 
 
    if(length>0 && inData!=outData) { 
        uprv_memcpy(outData, inData, length); 
    } 
 
    return length; 
} 
 
U_CFUNC UBool 
uprv_isEbcdicAtSign(char c) { 
    static const uint8_t ebcdicAtSigns[] = { 
        0x7C, 0x44, 0x66, 0x80, 0xAC, 0xAE, 0xAF, 0xB5, 0xEC, 0xEF, 0x00 }; 
    return c != 0 && uprv_strchr((const char *)ebcdicAtSigns, c) != nullptr; 
} 
 
/* compare invariant strings; variant characters compare less than others and unlike each other */ 
U_CFUNC int32_t 
uprv_compareInvAscii(const UDataSwapper *ds, 
                     const char *outString, int32_t outLength, 
                     const UChar *localString, int32_t localLength) { 
    (void)ds; 
    int32_t minLength; 
    UChar32 c1, c2; 
    uint8_t c; 
 
    if(outString==NULL || outLength<-1 || localString==NULL || localLength<-1) { 
        return 0; 
    } 
 
    if(outLength<0) { 
        outLength=(int32_t)uprv_strlen(outString); 
    } 
    if(localLength<0) { 
        localLength=u_strlen(localString); 
    } 
 
    minLength= outLength<localLength ? outLength : localLength; 
 
    while(minLength>0) { 
        c=(uint8_t)*outString++; 
        if(UCHAR_IS_INVARIANT(c)) { 
            c1=c; 
        } else { 
            c1=-1; 
        } 
 
        c2=*localString++; 
        if(!UCHAR_IS_INVARIANT(c2)) { 
            c2=-2; 
        } 
 
        if((c1-=c2)!=0) { 
            return c1; 
        } 
 
        --minLength; 
    } 
 
    /* strings start with same prefix, compare lengths */ 
    return outLength-localLength; 
} 
 
U_CFUNC int32_t 
uprv_compareInvEbcdic(const UDataSwapper *ds, 
                      const char *outString, int32_t outLength, 
                      const UChar *localString, int32_t localLength) { 
    (void)ds; 
    int32_t minLength; 
    UChar32 c1, c2; 
    uint8_t c; 
 
    if(outString==NULL || outLength<-1 || localString==NULL || localLength<-1) { 
        return 0; 
    } 
 
    if(outLength<0) { 
        outLength=(int32_t)uprv_strlen(outString); 
    } 
    if(localLength<0) { 
        localLength=u_strlen(localString); 
    } 
 
    minLength= outLength<localLength ? outLength : localLength; 
 
    while(minLength>0) { 
        c=(uint8_t)*outString++; 
        if(c==0) { 
            c1=0; 
        } else if((c1=asciiFromEbcdic[c])!=0 && UCHAR_IS_INVARIANT(c1)) { 
            /* c1 is set */ 
        } else { 
            c1=-1; 
        } 
 
        c2=*localString++; 
        if(!UCHAR_IS_INVARIANT(c2)) { 
            c2=-2; 
        } 
 
        if((c1-=c2)!=0) { 
            return c1; 
        } 
 
        --minLength; 
    } 
 
    /* strings start with same prefix, compare lengths */ 
    return outLength-localLength; 
} 
 
U_CAPI int32_t U_EXPORT2 
uprv_compareInvEbcdicAsAscii(const char *s1, const char *s2) { 
    int32_t c1, c2; 
 
    for(;; ++s1, ++s2) { 
        c1=(uint8_t)*s1; 
        c2=(uint8_t)*s2; 
        if(c1!=c2) { 
            if(c1!=0 && ((c1=asciiFromEbcdic[c1])==0 || !UCHAR_IS_INVARIANT(c1))) { 
                c1=-(int32_t)(uint8_t)*s1; 
            } 
            if(c2!=0 && ((c2=asciiFromEbcdic[c2])==0 || !UCHAR_IS_INVARIANT(c2))) { 
                c2=-(int32_t)(uint8_t)*s2; 
            } 
            return c1-c2; 
        } else if(c1==0) { 
            return 0; 
        } 
    } 
} 
 
U_CAPI char U_EXPORT2 
uprv_ebcdicToAscii(char c) { 
    return (char)asciiFromEbcdic[(uint8_t)c]; 
} 
 
U_CAPI char U_EXPORT2 
uprv_ebcdicToLowercaseAscii(char c) { 
    return (char)lowercaseAsciiFromEbcdic[(uint8_t)c]; 
} 
 
U_INTERNAL uint8_t* U_EXPORT2 
uprv_aestrncpy(uint8_t *dst, const uint8_t *src, int32_t n) 
{ 
  uint8_t *orig_dst = dst; 
 
  if(n==-1) {  
    n = static_cast<int32_t>(uprv_strlen((const char*)src)+1); /* copy NUL */ 
  } 
  /* copy non-null */ 
  while(*src && n>0) { 
    *(dst++) = asciiFromEbcdic[*(src++)]; 
    n--; 
  } 
  /* pad */ 
  while(n>0) { 
    *(dst++) = 0; 
    n--; 
  } 
  return orig_dst; 
} 
 
U_INTERNAL uint8_t* U_EXPORT2 
uprv_eastrncpy(uint8_t *dst, const uint8_t *src, int32_t n) 
{ 
  uint8_t *orig_dst = dst; 
 
  if(n==-1) {  
    n = static_cast<int32_t>(uprv_strlen((const char*)src)+1); /* copy NUL */ 
  } 
  /* copy non-null */ 
  while(*src && n>0) { 
    char ch = ebcdicFromAscii[*(src++)]; 
    if(ch == 0) { 
      ch = ebcdicFromAscii[0x3f]; /* questionmark (subchar) */ 
    } 
    *(dst++) = ch; 
    n--; 
  } 
  /* pad */ 
  while(n>0) { 
    *(dst++) = 0; 
    n--; 
  } 
  return orig_dst; 
}