mirror of
https://github.com/mozilla/gecko-dev.git
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325 lines
8.6 KiB
C++
325 lines
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* MODULE NOTES:
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* @update gess7/30/98
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*
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* Much as I hate to do it, we were using string compares wrong.
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* Often, programmers call functions like strcmp(s1,s2), and pass
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* one or more null strings. Rather than blow up on these, I've
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* added quick checks to ensure that cases like this don't cause
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* us to fail.
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*
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* In general, if you pass a null into any of these string compare
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* routines, we simply return 0.
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*/
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#include "nsCRT.h"
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#include "nsIServiceManager.h"
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#include "nsCharTraits.h"
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#include "prbit.h"
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#include "nsUTF8Utils.h"
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#define ADD_TO_HASHVAL(hashval, c) \
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hashval = PR_ROTATE_LEFT32(hashval, 4) ^ (c);
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//----------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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// My lovely strtok routine
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#define IS_DELIM(m, c) ((m)[(c) >> 3] & (1 << ((c) & 7)))
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#define SET_DELIM(m, c) ((m)[(c) >> 3] |= (1 << ((c) & 7)))
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#define DELIM_TABLE_SIZE 32
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char* nsCRT::strtok(char* string, const char* delims, char* *newStr)
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{
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NS_ASSERTION(string, "Unlike regular strtok, the first argument cannot be null.");
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char delimTable[DELIM_TABLE_SIZE];
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PRUint32 i;
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char* result;
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char* str = string;
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for (i = 0; i < DELIM_TABLE_SIZE; i++)
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delimTable[i] = '\0';
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for (i = 0; delims[i]; i++) {
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SET_DELIM(delimTable, static_cast<PRUint8>(delims[i]));
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}
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NS_ASSERTION(delims[i] == '\0', "too many delimiters");
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// skip to beginning
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while (*str && IS_DELIM(delimTable, static_cast<PRUint8>(*str))) {
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str++;
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}
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result = str;
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// fix up the end of the token
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while (*str) {
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if (IS_DELIM(delimTable, static_cast<PRUint8>(*str))) {
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*str++ = '\0';
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break;
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}
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str++;
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}
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*newStr = str;
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return str == result ? NULL : result;
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}
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////////////////////////////////////////////////////////////////////////////////
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/**
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* Compare unichar string ptrs, stopping at the 1st null
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* NOTE: If both are null, we return 0.
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* NOTE: We terminate the search upon encountering a NULL
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*
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* @update gess 11/10/99
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* @param s1 and s2 both point to unichar strings
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* @return 0 if they match, -1 if s1<s2; 1 if s1>s2
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*/
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PRInt32 nsCRT::strcmp(const PRUnichar* s1, const PRUnichar* s2) {
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if(s1 && s2) {
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for (;;) {
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PRUnichar c1 = *s1++;
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PRUnichar c2 = *s2++;
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if (c1 != c2) {
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if (c1 < c2) return -1;
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return 1;
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}
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if ((0==c1) || (0==c2)) break;
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}
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}
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else {
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if (s1) // s2 must have been null
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return -1;
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if (s2) // s1 must have been null
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return 1;
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}
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return 0;
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}
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/**
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* Compare unichar string ptrs, stopping at the 1st null or nth char.
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* NOTE: If either is null, we return 0.
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* NOTE: We DO NOT terminate the search upon encountering NULL's before N
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*
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* @update gess 11/10/99
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* @param s1 and s2 both point to unichar strings
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* @return 0 if they match, -1 if s1<s2; 1 if s1>s2
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*/
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PRInt32 nsCRT::strncmp(const PRUnichar* s1, const PRUnichar* s2, PRUint32 n) {
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if(s1 && s2) {
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if(n != 0) {
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do {
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PRUnichar c1 = *s1++;
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PRUnichar c2 = *s2++;
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if (c1 != c2) {
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if (c1 < c2) return -1;
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return 1;
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}
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} while (--n != 0);
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}
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}
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return 0;
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}
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const char* nsCRT::memmem(const char* haystack, PRUint32 haystackLen,
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const char* needle, PRUint32 needleLen)
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{
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// Sanity checking
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if (!(haystack && needle && haystackLen && needleLen &&
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needleLen <= haystackLen))
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return NULL;
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#ifdef HAVE_MEMMEM
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return (const char*)::memmem(haystack, haystackLen, needle, needleLen);
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#else
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// No memmem means we need to roll our own. This isn't really optimized
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// for performance ... if that becomes an issue we can take some inspiration
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// from the js string compare code in jsstr.cpp
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for (PRInt32 i = 0; i < haystackLen - needleLen; i++) {
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if (!memcmp(haystack + i, needle, needleLen))
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return haystack + i;
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}
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#endif
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return NULL;
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}
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PRUnichar* nsCRT::strdup(const PRUnichar* str)
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{
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PRUint32 len = nsCRT::strlen(str);
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return strndup(str, len);
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}
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PRUnichar* nsCRT::strndup(const PRUnichar* str, PRUint32 len)
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{
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nsCppSharedAllocator<PRUnichar> shared_allocator;
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PRUnichar* rslt = shared_allocator.allocate(len + 1); // add one for the null
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// PRUnichar* rslt = new PRUnichar[len + 1];
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if (rslt == NULL) return NULL;
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memcpy(rslt, str, len * sizeof(PRUnichar));
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rslt[len] = 0;
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return rslt;
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}
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/**
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* |nsCRT::HashCode| is identical to |PL_HashString|, which tests
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* (http://bugzilla.mozilla.org/showattachment.cgi?attach_id=26596)
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* show to be the best hash among several other choices.
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*
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* We re-implement it here rather than calling it for two reasons:
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* (1) in this interface, we also calculate the length of the
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* string being hashed; and (2) the narrow and wide and `buffer' versions here
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* will hash equivalent strings to the same value, e.g., "Hello" and L"Hello".
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*/
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PRUint32 nsCRT::HashCode(const char* str, PRUint32* resultingStrLen)
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{
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PRUint32 h = 0;
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const char* s = str;
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if (!str) return h;
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unsigned char c;
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while ( (c = *s++) )
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ADD_TO_HASHVAL(h, c);
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if ( resultingStrLen )
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*resultingStrLen = (s-str)-1;
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return h;
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}
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PRUint32 nsCRT::HashCode(const char* start, PRUint32 length)
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{
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PRUint32 h = 0;
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const char* s = start;
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const char* end = start + length;
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unsigned char c;
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while ( s < end ) {
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c = *s++;
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ADD_TO_HASHVAL(h, c);
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}
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return h;
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}
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PRUint32 nsCRT::HashCode(const PRUnichar* str, PRUint32* resultingStrLen)
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{
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PRUint32 h = 0;
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const PRUnichar* s = str;
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if (!str) return h;
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PRUnichar c;
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while ( (c = *s++) )
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ADD_TO_HASHVAL(h, c);
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if ( resultingStrLen )
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*resultingStrLen = (s-str)-1;
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return h;
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}
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PRUint32 nsCRT::HashCode(const PRUnichar* start, PRUint32 length)
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{
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PRUint32 h = 0;
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const PRUnichar* s = start;
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const PRUnichar* end = start + length;
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PRUnichar c;
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while ( s < end ) {
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c = *s++;
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ADD_TO_HASHVAL(h, c);
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}
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return h;
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}
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PRUint32 nsCRT::HashCodeAsUTF16(const char* start, PRUint32 length,
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bool* err)
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{
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PRUint32 h = 0;
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const char* s = start;
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const char* end = start + length;
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*err = false;
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while ( s < end )
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{
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PRUint32 ucs4 = UTF8CharEnumerator::NextChar(&s, end, err);
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if (*err) {
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return 0;
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}
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if (ucs4 < PLANE1_BASE) {
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ADD_TO_HASHVAL(h, ucs4);
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}
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else {
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ADD_TO_HASHVAL(h, H_SURROGATE(ucs4));
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ADD_TO_HASHVAL(h, L_SURROGATE(ucs4));
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}
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}
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return h;
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}
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// This should use NSPR but NSPR isn't exporting its PR_strtoll function
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// Until then...
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PRInt64 nsCRT::atoll(const char *str)
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{
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if (!str)
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return LL_Zero();
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PRInt64 ll = LL_Zero(), digitll = LL_Zero();
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while (*str && *str >= '0' && *str <= '9') {
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LL_MUL(ll, ll, 10);
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LL_UI2L(digitll, (*str - '0'));
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LL_ADD(ll, ll, digitll);
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str++;
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}
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return ll;
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}
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