/* Copyright (C) 2004  David Decotigny (with INSA Rennes for vsnprintf)
    Copyright (C) 2003  The KOS Team
    Copyright (C) 1999  Free Software Foundation
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
    USA. 
 */
 #include "string.h"
 
 /* For an optimized version, see BSD sources ;) */
 void *memcpy(void *dst0, const void *src0, register unsigned int size)
 {
   char *dst;
   const char *src;
   for (dst = (char*)dst0, src = (const char*)src0 ;
        size > 0 ;
        dst++, src++, size--)
     *dst = *src;
   return dst0;
 }
 
 /* ditto */
 void *memset(void *dst0, register int c, register unsigned int length)
 {
   char *dst;
   for (dst = (char*) dst0 ;
        length > 0 ;
        dst++, length --)
     *dst = (char)c;
   return dst0;
 }
 
 int memcmp(const void *s1, const void *s2, size_t len)
 {
   const unsigned char *c1, *c2;
   unsigned int i;
  
   for (i = 0, c1 = s1, c2 = s2; i < len; i++, c1++, c2++)
     {
       if(*c1 != *c2)
         return *c1 - *c2;
     }
  
   return 0;
 }
 
 
 unsigned int strlen(register const char *str)
 {
   unsigned int retval = 0;
   
   while (*str++)
     retval++;
   
   return retval;
 }
 
 
 unsigned int strnlen(const char * s, size_t count)
 {
   const char *sc;
   
   for (sc = s; count-- && *sc != '\0'; ++sc)
     /* nothing */continue;
 
   return sc - s;
 }
 
 
 char *strzcpy(register char *dst, register const char *src, register int len)
 {
   int i;
 
   if (len <= 0)
     return dst;
   
   for (i = 0; i < len; i++)
     {
       dst[i] = src[i];
       if(src[i] == '\0')
         return dst;
     }
   
   dst[len-1] = '\0'; 
   return dst;
 }
 
 
 char *strzcat (char *dest, const char *src, size_t n)
 {
   char *res = dest;
   
   for ( ; *dest ; dest++);
   
   for ( ; *src ; src++, dest++) {
     *dest = *src;
     n--;
     if (n <= 0)
       break;
   }
 
   *dest = '\0';
   return res;
 }
 
 int strcmp(register const char *s1, register const char *s2)
 {
   while (*s1 == *s2++)
     if (*s1++ == 0)
       return (0);
   
   return (*(const unsigned char *)s1 - *(const unsigned char *)(s2 - 1));
 }
 
 
 int strncmp(register const char *s1, register const char *s2, register int len)
 {
   char c1 = '\0', c2 = '\0';
   
   while (len > 0)
     {
       c1 = (unsigned char) *s1++;
       c2 = (unsigned char) *s2++;
       if (c1 == '\0' || c1 != c2)
         return c1 - c2;
       len--;
     }
   
   return c1 - c2;
 }