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  *              _strdec (MSVCRT.@)
  51  */
  52 char* _strdec(const char* str1, const char* str2)
  53 {
  54   /* Hmm. While the docs suggest that the following should work... */
  55   /*  return (str2<=str1?0:str2-1); */
  56   /* ...Version 2.50.4170 (NT) from win98 constantly decrements! */
  57   str1 = str1; /* remove warning */
  58   return (char *)str2-1;
  59 }
  60
  61 /*********************************************************************
  62  *              _mbsdup (MSVCRT.@)
  63  *              _strdup (MSVCRT.@)
  64  */
  65 char* _strdup(const char* str)
  66 {
  67     char * ret = MSVCRT_malloc(strlen(str)+1);
  68     if (ret) strcpy( ret, str );
  69     return ret;
  70 }
  71
  72 /*********************************************************************
  73  *              _strinc (MSVCRT.@)
  74  */
  75 char* _strinc(const char* str)
  76 {
  77   return (char*)str+1;
  78 }
  79
  80 /*********************************************************************
  81  *              _strnextc (MSVCRT.@)
  82  */
  83 unsigned int _strnextc(const char* str)
  84 {
  85   return (unsigned int)*str;
  86 }
  87
  88 /*********************************************************************
  89  *              _strninc (MSVCRT.@)
  90  *
  91  * Return a pointer to the 'n'th character in a string
  92  */
  93 char* _strninc(char* str, unsigned int n)
  94 {
  95   return str + n;
  96 }
  97
  98 /*********************************************************************
  99  *              _strnset (MSVCRT.@)
 100  */
 101 char* _strnset(char* str, int value, unsigned int len)
 102 {
 103   if (len > 0 && str)
 104     while (*str && len--)
 105       *str++ = value;
 106   return str;
 107 }
 108
 109 /*********************************************************************
 110  *              _strrev (MSVCRT.@)
 111  */
 112 char* _strrev(char* str)
 113 {
 114   char * p1;
 115   char * p2;
 116
 117   if (str && *str)
 118     for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2)
 119     {
 120       *p1 ^= *p2;
 121       *p2 ^= *p1;
 122       *p1 ^= *p2;
 123     }
 124
 125   return str;
 126 }
 127
 128 /*********************************************************************
 129  *              _strset (MSVCRT.@)
 130  */
 131 char* _strset(char* str, int value)
 132 {
 133   char *ptr = str;
 134   while (*ptr)
 135     *ptr++ = value;
 136
 137   return str;
 138 }
 139
 140 /*********************************************************************
 141  *              _strncnt (MSVCRT.@)
 142  */
 143 unsigned int _strncnt(char* str, unsigned int max)
 144 {
 145   unsigned int len = strlen(str);
 146   return (len > max? max : len);
 147 }
 148
 149 /*********************************************************************
 150  *              _strspnp (MSVCRT.@)
 151  */
 152 char* _strspnp(char* str1, char* str2)
 153 {
 154   str1 += strspn(str1,str2);
 155   return *str1? str1 : 0;
 156 }
 157
 158 /*********************************************************************
 159  *              _swab (MSVCRT.@)
 160  */
 161 void _swab(char* src, char* dst, int len)
 162 {
 163   if (len > 1)
 164   {
 165     len = (unsigned)len >> 1;
 166
 167     while (len--) {
 168       *dst++ = src[1];
 169       *dst++ = *src++;
 170       src++;
 171     }
 172   }
 173 }