dlls/msvcrt/string.c

   1 /*
   2  * MSVCRT string functions
   3  *
   4  * Copyright 1996,1998 Marcus Meissner
   5  * Copyright 1996 Jukka Iivonen
   6  * Copyright 1997,2000 Uwe Bonnes
   7  * Copyright 2000 Jon Griffiths
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include "msvcrt.h"
  25 #include "msvcrt/stdlib.h"
  26 #include "msvcrt/string.h"
  27
  28 #include "wine/debug.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  31
  32 /* INTERNAL: MSVCRT_malloc() based strndup */
  33 char* msvcrt_strndup(const char* buf, unsigned int size)
  34 {
  35   char* ret;
  36   unsigned int len = strlen(buf), max_len;
  37
  38   max_len = size <= len? size : len + 1;
  39
  40   ret = MSVCRT_malloc(max_len);
  41   if (ret)
  42   {
  43     memcpy(ret,buf,max_len);
  44     ret[max_len] = 0;
  45   }
  46   return ret;
  47 }
  48
  49 /*********************************************************************
  50  *              _mbsdup (MSVCRT.@)
  51  *              _strdup (MSVCRT.@)
  52  */
  53 char* _strdup(const char* str)
  54 {
  55     char * ret = MSVCRT_malloc(strlen(str)+1);
  56     if (ret) strcpy( ret, str );
  57     return ret;
  58 }
  59
  60 /*********************************************************************
  61  *              _strnset (MSVCRT.@)
  62  */
  63 char* _strnset(char* str, int value, unsigned int len)
  64 {
  65   if (len > 0 && str)
  66     while (*str && len--)
  67       *str++ = value;
  68   return str;
  69 }
  70
  71 /*********************************************************************
  72  *              _strrev (MSVCRT.@)
  73  */
  74 char* _strrev(char* str)
  75 {
  76   char * p1;
  77   char * p2;
  78
  79   if (str && *str)
  80     for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
  81     {
  82       *p1 ^= *p2;
  83       *p2 ^= *p1;
  84       *p1 ^= *p2;
  85     }
  86
  87   return str;
  88 }
  89
  90 /*********************************************************************
  91  *              _strset (MSVCRT.@)
  92  */
  93 char* _strset(char* str, int value)
  94 {
  95   char *ptr = str;
  96   while (*ptr)
  97     *ptr++ = value;
  98
  99   return str;
 100 }
 101
 102 /*********************************************************************
 103  *              _swab (MSVCRT.@)
 104  */
 105 void _swab(char* src, char* dst, int len)
 106 {
 107   if (len > 1)
 108   {
 109     len = (unsigned)len >> 1;
 110
 111     while (len--) {
 112       *dst++ = src[1];
 113       *dst++ = *src++;
 114       src++;
 115     }
 116   }
 117 }