memory/string.c

   1 /*
   2  * String functions
   3  *
   4  * Copyright 1993 Yngvi Sigurjonsson
   5  * Copyright 1996 Alexandre Julliard
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <ctype.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25
  26 #include "ntstatus.h"
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "wine/winbase16.h"
  30 #include "wine/exception.h"
  31 #include "wine/unicode.h"
  32 #include "winerror.h"
  33 #include "winnls.h"
  34 #include "excpt.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(string);
  38
  39 /***********************************************************************
  40  *           lstrcpyn    (KERNEL32.@)
  41  *           lstrcpynA   (KERNEL32.@)
  42  *
  43  * Note: this function differs from the UNIX strncpy, it _always_ writes
  44  * a terminating \0.
  45  *
  46  * Note: n is an INT but Windows treats it as unsigned, and will happily
  47  * copy a gazillion chars if n is negative.
  48  */
  49 LPSTR WINAPI lstrcpynA( LPSTR dst, LPCSTR src, INT n )
  50 {
  51     LPSTR p = dst;
  52     UINT count = n;
  53
  54     TRACE("(%p, %s, %i)\n", dst, debugstr_a(src), n);
  55
  56     /* In real windows the whole function is protected by an exception handler
  57      * that returns ERROR_INVALID_PARAMETER on faulty parameters
  58      * We currently just check for NULL.
  59      */
  60     if (!dst || !src) {
  61         SetLastError(ERROR_INVALID_PARAMETER);
  62         return 0;
  63     }
  64     while ((count > 1) && *src)
  65     {
  66         count--;
  67         *p++ = *src++;
  68     }
  69     if (count) *p = 0;
  70     return dst;
  71 }
  72
  73
  74 /***********************************************************************
  75  *           lstrcpynW   (KERNEL32.@)
  76  *
  77  * Note: this function differs from the UNIX strncpy, it _always_ writes
  78  * a terminating \0
  79  *
  80  * Note: n is an INT but Windows treats it as unsigned, and will happily
  81  * copy a gazillion chars if n is negative.
  82  */
  83 LPWSTR WINAPI lstrcpynW( LPWSTR dst, LPCWSTR src, INT n )
  84 {
  85     LPWSTR p = dst;
  86     UINT count = n;
  87
  88     TRACE("(%p, %s, %i)\n", dst,  debugstr_w(src), n);
  89
  90     /* In real windows the whole function is protected by an exception handler
  91      * that returns ERROR_INVALID_PARAMETER on faulty parameters
  92      * We currently just check for NULL.
  93      */
  94     if (!dst || !src) {
  95         SetLastError(ERROR_INVALID_PARAMETER);
  96         return 0;
  97     }
  98     while ((count > 1) && *src)
  99     {
 100         count--;
 101         *p++ = *src++;
 102     }
 103     if (count) *p = 0;
 104     return dst;
 105 }