LCOV - code coverage report
Current view: directory - xpcom/ds - nsCRT.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 68 50 73.5 %
Date: 2012-06-02 Functions: 7 4 57.1 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 :  
      39                 : /**
      40                 :  * MODULE NOTES:
      41                 :  * @update  gess7/30/98
      42                 :  *
      43                 :  * Much as I hate to do it, we were using string compares wrong.
      44                 :  * Often, programmers call functions like strcmp(s1,s2), and pass
      45                 :  * one or more null strings. Rather than blow up on these, I've 
      46                 :  * added quick checks to ensure that cases like this don't cause
      47                 :  * us to fail.
      48                 :  *
      49                 :  * In general, if you pass a null into any of these string compare
      50                 :  * routines, we simply return 0.
      51                 :  */
      52                 : 
      53                 : 
      54                 : #include "nsCRT.h"
      55                 : #include "nsIServiceManager.h"
      56                 : #include "nsCharTraits.h"
      57                 : #include "nsUTF8Utils.h"
      58                 : 
      59                 : //----------------------------------------------------------------------
      60                 : 
      61                 : 
      62                 : ////////////////////////////////////////////////////////////////////////////////
      63                 : // My lovely strtok routine
      64                 : 
      65                 : #define IS_DELIM(m, c)          ((m)[(c) >> 3] & (1 << ((c) & 7)))
      66                 : #define SET_DELIM(m, c)         ((m)[(c) >> 3] |= (1 << ((c) & 7)))
      67                 : #define DELIM_TABLE_SIZE        32
      68                 : 
      69         3202178 : char* nsCRT::strtok(char* string, const char* delims, char* *newStr)
      70                 : {
      71         3202178 :   NS_ASSERTION(string, "Unlike regular strtok, the first argument cannot be null.");
      72                 : 
      73                 :   char delimTable[DELIM_TABLE_SIZE];
      74                 :   PRUint32 i;
      75                 :   char* result;
      76         3202178 :   char* str = string;
      77                 : 
      78       105671874 :   for (i = 0; i < DELIM_TABLE_SIZE; i++)
      79       102469696 :     delimTable[i] = '\0';
      80                 : 
      81         9604428 :   for (i = 0; delims[i]; i++) {
      82         6402250 :     SET_DELIM(delimTable, static_cast<PRUint8>(delims[i]));
      83                 :   }
      84         3202178 :   NS_ASSERTION(delims[i] == '\0', "too many delimiters");
      85                 : 
      86                 :   // skip to beginning
      87         6417566 :   while (*str && IS_DELIM(delimTable, static_cast<PRUint8>(*str))) {
      88           13210 :     str++;
      89                 :   }
      90         3202178 :   result = str;
      91                 : 
      92                 :   // fix up the end of the token
      93        56198992 :   while (*str) {
      94        51296325 :     if (IS_DELIM(delimTable, static_cast<PRUint8>(*str))) {
      95         1501689 :       *str++ = '\0';
      96         1501689 :       break;
      97                 :     }
      98        49794636 :     str++;
      99                 :   }
     100         3202178 :   *newStr = str;
     101                 : 
     102         3202178 :   return str == result ? NULL : result;
     103                 : }
     104                 : 
     105                 : ////////////////////////////////////////////////////////////////////////////////
     106                 : 
     107                 : /**
     108                 :  * Compare unichar string ptrs, stopping at the 1st null 
     109                 :  * NOTE: If both are null, we return 0.
     110                 :  * NOTE: We terminate the search upon encountering a NULL
     111                 :  *
     112                 :  * @update  gess 11/10/99
     113                 :  * @param   s1 and s2 both point to unichar strings
     114                 :  * @return  0 if they match, -1 if s1<s2; 1 if s1>s2
     115                 :  */
     116          183841 : PRInt32 nsCRT::strcmp(const PRUnichar* s1, const PRUnichar* s2) {
     117          183841 :   if(s1 && s2) {
     118         1168242 :     for (;;) {
     119         1350747 :       PRUnichar c1 = *s1++;
     120         1350747 :       PRUnichar c2 = *s2++;
     121         1350747 :       if (c1 != c2) {
     122           16699 :         if (c1 < c2) return -1;
     123             380 :         return 1;
     124                 :       }
     125         1334048 :       if ((0==c1) || (0==c2)) break;
     126          165806 :     }
     127                 :   }
     128                 :   else {
     129            1336 :     if (s1)                     // s2 must have been null
     130               0 :       return -1;
     131            1336 :     if (s2)                     // s1 must have been null
     132            1336 :       return 1;
     133                 :   }
     134          165806 :   return 0;
     135                 : }
     136                 : 
     137                 : /**
     138                 :  * Compare unichar string ptrs, stopping at the 1st null or nth char.
     139                 :  * NOTE: If either is null, we return 0.
     140                 :  * NOTE: We DO NOT terminate the search upon encountering NULL's before N
     141                 :  *
     142                 :  * @update  gess 11/10/99
     143                 :  * @param   s1 and s2 both point to unichar strings
     144                 :  * @return  0 if they match, -1 if s1<s2; 1 if s1>s2
     145                 :  */
     146               4 : PRInt32 nsCRT::strncmp(const PRUnichar* s1, const PRUnichar* s2, PRUint32 n) {
     147               4 :   if(s1 && s2) { 
     148               4 :     if(n != 0) {
     149               2 :       do {
     150               6 :         PRUnichar c1 = *s1++;
     151               6 :         PRUnichar c2 = *s2++;
     152               6 :         if (c1 != c2) {
     153               4 :           if (c1 < c2) return -1;
     154               2 :           return 1;
     155                 :         }
     156                 :       } while (--n != 0);
     157                 :     }
     158                 :   }
     159               0 :   return 0;
     160                 : }
     161                 : 
     162               0 : const char* nsCRT::memmem(const char* haystack, PRUint32 haystackLen,
     163                 :                           const char* needle, PRUint32 needleLen)
     164                 : {
     165                 :   // Sanity checking
     166               0 :   if (!(haystack && needle && haystackLen && needleLen &&
     167               0 :         needleLen <= haystackLen))
     168               0 :     return NULL;
     169                 : 
     170                 : #ifdef HAVE_MEMMEM
     171               0 :   return (const char*)::memmem(haystack, haystackLen, needle, needleLen);
     172                 : #else
     173                 :   // No memmem means we need to roll our own.  This isn't really optimized
     174                 :   // for performance ... if that becomes an issue we can take some inspiration
     175                 :   // from the js string compare code in jsstr.cpp
     176                 :   for (PRInt32 i = 0; i < haystackLen - needleLen; i++) {
     177                 :     if (!memcmp(haystack + i, needle, needleLen))
     178                 :       return haystack + i;
     179                 :   }
     180                 : #endif
     181                 :   return NULL;
     182                 : }
     183                 : 
     184               0 : PRUnichar* nsCRT::strdup(const PRUnichar* str)
     185                 : {
     186               0 :   PRUint32 len = nsCRT::strlen(str);
     187               0 :   return strndup(str, len);
     188                 : }
     189                 : 
     190               0 : PRUnichar* nsCRT::strndup(const PRUnichar* str, PRUint32 len)
     191                 : {
     192               0 :         nsCppSharedAllocator<PRUnichar> shared_allocator;
     193               0 :         PRUnichar* rslt = shared_allocator.allocate(len + 1); // add one for the null
     194                 :   // PRUnichar* rslt = new PRUnichar[len + 1];
     195                 : 
     196               0 :   if (rslt == NULL) return NULL;
     197               0 :   memcpy(rslt, str, len * sizeof(PRUnichar));
     198               0 :   rslt[len] = 0;
     199               0 :   return rslt;
     200                 : }
     201                 : 
     202                 : // This should use NSPR but NSPR isn't exporting its PR_strtoll function
     203                 : // Until then...
     204               5 : PRInt64 nsCRT::atoll(const char *str)
     205                 : {
     206               5 :     if (!str)
     207               0 :         return LL_Zero();
     208                 : 
     209               5 :     PRInt64 ll = LL_Zero(), digitll = LL_Zero();
     210                 : 
     211              64 :     while (*str && *str >= '0' && *str <= '9') {
     212              54 :         LL_MUL(ll, ll, 10);
     213              54 :         LL_UI2L(digitll, (*str - '0'));
     214              54 :         LL_ADD(ll, ll, digitll);
     215              54 :         str++;
     216                 :     }
     217                 : 
     218               5 :     return ll;
     219                 : }
     220                 : 

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