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44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <string.h>
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/* Copy no more than N bytes of SRC to DEST, stopping when C is found.
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Return the position in DEST one byte past where C was copied,
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or NULL if C was not found in the first N bytes of SRC. */
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PTR
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DEFUN(__memccpy, (dest, src, c, n),
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PTR dest AND CONST PTR src AND int c AND size_t nbytes)
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{
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/* Except when N > 65535, this is what a hand-coded version would
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do anyway. */
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PTR found = memchr (src, c, n);
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if (found == NULL)
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{
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(void) memcpy (dest, src, n);
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return NULL;
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}
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(void) memcpy (dest, src, (char *) found + 1 - (char *) src);
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return (PTR) ((char *) dest + ((char *) found + 1 - (char *) src));
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}
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