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/* Copyright (C) 2000 MySQL AB
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; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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 */
/* File : strmake.c
Author : Michael Widenius
Updated: 20 Jul 1984
Defines: strmake()
strmake(dst,src,length) moves length characters, or until end, of src to
dst and appends a closing NUL to dst.
Note that if strlen(src) >= length then dst[length] will be set to \0
strmake() returns pointer to closing null
#include <my_global.h>
#include "m_string.h"
char *strmake(register char *dst, register const char *src, uint length)
'length' is the maximum length of the string; the buffer needs
to be one character larger to accomodate the terminating '\0'.
This is easy to get wrong, so we make sure we write to the
entire length of the buffer to identify incorrect buffer-sizes.
We only initialise the "unused" part of the buffer here, a) for
efficiency, and b) because dst==src is allowed, so initialising
the entire buffer would overwrite the source-string. Also, we
write a character rather than '\0' as this makes spotting these
problems in the results easier.
uint n= strlen(src) + 1;
if (n <= length)
memset(dst + n, (int) 'Z', length - n + 1);
while (length--)
if (! (*dst++ = *src++))
return dst-1;
return dst;
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