97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
/*
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**********************************************************************
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* Copyright (c) 2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/19/2001 aliu Creation.
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**********************************************************************
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*/
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#include "util.h"
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// Define UChar constants using hex for EBCDIC compatibility
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// Used #define to reduce private static exports and memory access time.
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#define BACKSLASH ((UChar)0x005C) /*\*/
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#define UPPER_U ((UChar)0x0055) /*U*/
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#define LOWER_U ((UChar)0x0075) /*u*/
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// "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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static const UChar DIGITS[] = {
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48,49,50,51,52,53,54,55,56,57,
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65,66,67,68,69,70,71,72,73,74,
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75,76,77,78,79,80,81,82,83,84,
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85,86,87,88,89,90
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};
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UnicodeString& Utility::appendNumber(UnicodeString& result, int32_t n,
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int32_t radix, int32_t minDigits) {
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if (radix < 2 || radix > 36) {
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// Bogus radix
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return result.append((UChar)63/*?*/);
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}
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// Handle negatives
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if (n < 0) {
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n = -n;
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result.append((UChar)45/*-*/);
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}
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// First determine the number of digits
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int32_t nn = n;
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int32_t r = 1;
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while (nn >= radix) {
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nn /= radix;
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r *= radix;
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--minDigits;
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}
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// Now generate the digits
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while (--minDigits > 0) {
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result.append(DIGITS[0]);
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}
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while (r > 0) {
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int32_t digit = n / r;
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result.append(DIGITS[digit]);
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n -= digit * r;
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r /= radix;
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}
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return result;
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}
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static const UChar HEX[16] = {48,49,50,51,52,53,54,55, // 0-7
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56,57,65,66,67,68,69,70}; // 8-9 A-F
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/**
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* Return true if the character is NOT printable ASCII.
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*/
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UBool Utility::isUnprintable(UChar32 c) {
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return !(c == 0x0A || (c >= 0x20 && c <= 0x7E));
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}
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/**
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* Escape unprintable characters using \uxxxx notation for U+0000 to
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* U+FFFF and \Uxxxxxxxx for U+10000 and above. If the character is
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* printable ASCII, then do nothing and return FALSE. Otherwise,
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* append the escaped notation and return TRUE.
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*/
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UBool Utility::escapeUnprintable(UnicodeString& result, UChar32 c) {
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if (isUnprintable(c)) {
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result.append(BACKSLASH);
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if (c & ~0xFFFF) {
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result.append(UPPER_U);
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result.append(HEX[0xF&(c>>28)]);
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result.append(HEX[0xF&(c>>24)]);
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result.append(HEX[0xF&(c>>20)]);
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result.append(HEX[0xF&(c>>16)]);
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} else {
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result.append(LOWER_U);
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}
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result.append(HEX[0xF&(c>>12)]);
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result.append(HEX[0xF&(c>>8)]);
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result.append(HEX[0xF&(c>>4)]);
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result.append(HEX[0xF&c]);
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return TRUE;
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}
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return FALSE;
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}
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//eof
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