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glibc  2.9
memccpy.c
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00001 /* Copyright (C) 1991, 1995, 1997, 1999, 2000 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <string.h>
00020 
00021 #undef __memccpy
00022 #undef memccpy
00023 
00024 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
00025    Return the position in DEST one byte past where C was copied, or
00026    NULL if C was not found in the first N bytes of SRC.  */
00027 void *
00028 __memccpy (dest, src, c, n)
00029       void *dest;
00030       const void *src;
00031       int c;
00032       size_t n;
00033 {
00034   register const char *s = src;
00035   register char *d = dest;
00036   register const char x = c;
00037   register size_t i = n;
00038 
00039   while (i-- > 0)
00040     if ((*d++ = *s++) == x)
00041       return d;
00042 
00043   return NULL;
00044 }
00045 
00046 weak_alias (__memccpy, memccpy)