342 lines
8.6 KiB
C++
342 lines
8.6 KiB
C++
// © 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) 1997-2011, 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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*
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* File CSTRING.C
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*
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* @author Helena Shih
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*
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* Modification History:
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*
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* Date Name Description
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* 6/18/98 hshih Created
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* 09/08/98 stephen Added include for ctype, for Mac Port
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* 11/15/99 helena Integrated S/390 IEEE changes.
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******************************************************************************
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "unicode/utypes.h"
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#include "cmemory.h"
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#include "cstring.h"
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#include "uassert.h"
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/*
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* We hardcode case conversion for invariant characters to match our expectation
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* and the compiler execution charset.
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* This prevents problems on systems
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* - with non-default casing behavior, like Turkish system locales where
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* tolower('I') maps to dotless i and toupper('i') maps to dotted I
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* - where there are no lowercase Latin characters at all, or using different
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* codes (some old EBCDIC codepages)
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*
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* This works because the compiler usually runs on a platform where the execution
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* charset includes all of the invariant characters at their expected
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* code positions, so that the char * string literals in ICU code match
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* the char literals here.
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*
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* Note that the set of lowercase Latin letters is discontiguous in EBCDIC
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* and the set of uppercase Latin letters is discontiguous as well.
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*/
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U_CAPI UBool U_EXPORT2
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uprv_isASCIILetter(char c) {
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#if U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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return
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('a'<=c && c<='i') || ('j'<=c && c<='r') || ('s'<=c && c<='z') ||
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('A'<=c && c<='I') || ('J'<=c && c<='R') || ('S'<=c && c<='Z');
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#else
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return ('a'<=c && c<='z') || ('A'<=c && c<='Z');
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#endif
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}
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U_CAPI char U_EXPORT2
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uprv_toupper(char c) {
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#if U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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if(('a'<=c && c<='i') || ('j'<=c && c<='r') || ('s'<=c && c<='z')) {
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c=(char)(c+('A'-'a'));
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}
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#else
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if('a'<=c && c<='z') {
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c=(char)(c+('A'-'a'));
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}
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#endif
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return c;
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}
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#if 0
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/*
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* Commented out because cstring.h defines uprv_tolower() to be
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* the same as either uprv_asciitolower() or uprv_ebcdictolower()
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* to reduce the amount of code to cover with tests.
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*
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* Note that this uprv_tolower() definition is likely to work for most
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* charset families, not just ASCII and EBCDIC, because its #else branch
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* is written generically.
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*/
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U_CAPI char U_EXPORT2
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uprv_tolower(char c) {
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#if U_CHARSET_FAMILY==U_EBCDIC_FAMILY
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if(('A'<=c && c<='I') || ('J'<=c && c<='R') || ('S'<=c && c<='Z')) {
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c=(char)(c+('a'-'A'));
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}
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#else
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if('A'<=c && c<='Z') {
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c=(char)(c+('a'-'A'));
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}
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#endif
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return c;
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}
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#endif
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U_CAPI char U_EXPORT2
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uprv_asciitolower(char c) {
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if(0x41<=c && c<=0x5a) {
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c=(char)(c+0x20);
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}
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return c;
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}
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U_CAPI char U_EXPORT2
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uprv_ebcdictolower(char c) {
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if( (0xc1<=(uint8_t)c && (uint8_t)c<=0xc9) ||
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(0xd1<=(uint8_t)c && (uint8_t)c<=0xd9) ||
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(0xe2<=(uint8_t)c && (uint8_t)c<=0xe9)
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) {
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c=(char)(c-0x40);
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}
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return c;
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}
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U_CAPI char* U_EXPORT2
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T_CString_toLowerCase(char* str)
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{
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char* origPtr = str;
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if (str) {
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do
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*str = (char)uprv_tolower(*str);
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while (*(str++));
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}
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return origPtr;
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}
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U_CAPI char* U_EXPORT2
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T_CString_toUpperCase(char* str)
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{
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char* origPtr = str;
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if (str) {
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do
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*str = (char)uprv_toupper(*str);
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while (*(str++));
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}
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return origPtr;
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}
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/*
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* Takes a int32_t and fills in a char* string with that number "radix"-based.
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* Does not handle negative values (makes an empty string for them).
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* Writes at most 12 chars ("-2147483647" plus NUL).
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* Returns the length of the string (not including the NUL).
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*/
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U_CAPI int32_t U_EXPORT2
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T_CString_integerToString(char* buffer, int32_t v, int32_t radix)
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{
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char tbuf[30];
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int32_t tbx = sizeof(tbuf);
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uint8_t digit;
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int32_t length = 0;
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uint32_t uval;
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U_ASSERT(radix>=2 && radix<=16);
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uval = (uint32_t) v;
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if(v<0 && radix == 10) {
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/* Only in base 10 do we conside numbers to be signed. */
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uval = (uint32_t)(-v);
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buffer[length++] = '-';
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}
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tbx = sizeof(tbuf)-1;
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tbuf[tbx] = 0; /* We are generating the digits backwards. Null term the end. */
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do {
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digit = (uint8_t)(uval % radix);
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tbuf[--tbx] = (char)(T_CString_itosOffset(digit));
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uval = uval / radix;
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} while (uval != 0);
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/* copy converted number into user buffer */
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uprv_strcpy(buffer+length, tbuf+tbx);
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length += sizeof(tbuf) - tbx -1;
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return length;
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}
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/*
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* Takes a int64_t and fills in a char* string with that number "radix"-based.
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* Writes at most 21: chars ("-9223372036854775807" plus NUL).
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* Returns the length of the string, not including the terminating NUL.
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*/
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U_CAPI int32_t U_EXPORT2
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T_CString_int64ToString(char* buffer, int64_t v, uint32_t radix)
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{
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char tbuf[30];
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int32_t tbx = sizeof(tbuf);
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uint8_t digit;
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int32_t length = 0;
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uint64_t uval;
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U_ASSERT(radix>=2 && radix<=16);
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uval = (uint64_t) v;
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if(v<0 && radix == 10) {
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/* Only in base 10 do we conside numbers to be signed. */
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uval = (uint64_t)(-v);
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buffer[length++] = '-';
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}
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tbx = sizeof(tbuf)-1;
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tbuf[tbx] = 0; /* We are generating the digits backwards. Null term the end. */
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do {
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digit = (uint8_t)(uval % radix);
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tbuf[--tbx] = (char)(T_CString_itosOffset(digit));
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uval = uval / radix;
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} while (uval != 0);
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/* copy converted number into user buffer */
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uprv_strcpy(buffer+length, tbuf+tbx);
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length += sizeof(tbuf) - tbx -1;
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return length;
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}
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U_CAPI int32_t U_EXPORT2
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T_CString_stringToInteger(const char *integerString, int32_t radix)
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{
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char *end;
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return uprv_strtoul(integerString, &end, radix);
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}
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U_CAPI int U_EXPORT2
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uprv_stricmp(const char *str1, const char *str2) {
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if(str1==nullptr) {
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if(str2==nullptr) {
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return 0;
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} else {
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return -1;
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}
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} else if(str2==nullptr) {
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return 1;
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} else {
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/* compare non-nullptr strings lexically with lowercase */
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int rc;
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unsigned char c1, c2;
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for(;;) {
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c1=(unsigned char)*str1;
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c2=(unsigned char)*str2;
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if(c1==0) {
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if(c2==0) {
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return 0;
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} else {
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return -1;
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}
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} else if(c2==0) {
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return 1;
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} else {
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/* compare non-zero characters with lowercase */
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rc=(int)(unsigned char)uprv_tolower(c1)-(int)(unsigned char)uprv_tolower(c2);
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if(rc!=0) {
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return rc;
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}
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}
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++str1;
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++str2;
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}
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}
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}
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U_CAPI int U_EXPORT2
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uprv_strnicmp(const char *str1, const char *str2, uint32_t n) {
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if(str1==nullptr) {
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if(str2==nullptr) {
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return 0;
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} else {
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return -1;
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}
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} else if(str2==nullptr) {
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return 1;
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} else {
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/* compare non-nullptr strings lexically with lowercase */
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int rc;
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unsigned char c1, c2;
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for(; n--;) {
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c1=(unsigned char)*str1;
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c2=(unsigned char)*str2;
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if(c1==0) {
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if(c2==0) {
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return 0;
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} else {
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return -1;
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}
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} else if(c2==0) {
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return 1;
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} else {
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/* compare non-zero characters with lowercase */
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rc=(int)(unsigned char)uprv_tolower(c1)-(int)(unsigned char)uprv_tolower(c2);
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if(rc!=0) {
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return rc;
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}
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}
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++str1;
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++str2;
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}
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}
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return 0;
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}
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U_CAPI char* U_EXPORT2
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uprv_strdup(const char *src) {
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size_t len = uprv_strlen(src) + 1;
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char *dup = (char *) uprv_malloc(len);
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if (dup) {
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uprv_memcpy(dup, src, len);
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}
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return dup;
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}
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U_CAPI char* U_EXPORT2
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uprv_strndup(const char *src, int32_t n) {
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char *dup;
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if(n < 0) {
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dup = uprv_strdup(src);
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} else {
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dup = (char*)uprv_malloc(n+1);
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if (dup) {
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uprv_memcpy(dup, src, n);
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dup[n] = 0;
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}
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}
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return dup;
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}
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