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glibc  2.9
memccpy.c
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00001 /* Copyright (C) 1991, 1992, 1995, 1997 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 /* Copy no more than N bytes of SRC to DEST, stopping when C is found.
00022    Return the position in DEST one byte past where C was copied,
00023    or NULL if C was not found in the first N bytes of SRC.  */
00024 void *
00025 __memccpy (dest, src, c, n)
00026      void *dest;
00027      const void *src;
00028      int c;
00029      size_t nbytes;
00030 {
00031   /* Except when N > 65535, this is what a hand-coded version would
00032      do anyway.  */
00033 
00034   void *found = memchr (src, c, n);
00035 
00036   if (found == NULL)
00037     {
00038       (void) memcpy (dest, src, n);
00039       return NULL;
00040     }
00041 
00042   (void) memcpy (dest, src, (char *) found + 1 - (char *) src);
00043   return (PTR) ((char *) dest + ((char *) found + 1 - (char *) src));
00044 }
00045 
00046 weak_alias (__memccpy, memccpy)