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55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* File : strmake.c
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Author : Michael Widenius
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Updated: 20 Jul 1984
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Defines: strmake()
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strmake(dst,src,length) moves length characters, or until end, of src to
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dst and appends a closing NUL to dst.
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Note that if strlen(src) >= length then dst[length] will be set to \0
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strmake() returns pointer to closing null
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*/
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#include <my_global.h>
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#include "m_string.h"
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char *strmake(register char *dst, register const char *src, size_t length)
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{
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#ifdef EXTRA_DEBUG
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/*
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'length' is the maximum length of the string; the buffer needs
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to be one character larger to accomodate the terminating '\0'.
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This is easy to get wrong, so we make sure we write to the
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entire length of the buffer to identify incorrect buffer-sizes.
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We only initialise the "unused" part of the buffer here, a) for
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efficiency, and b) because dst==src is allowed, so initialising
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the entire buffer would overwrite the source-string. Also, we
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write a character rather than '\0' as this makes spotting these
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problems in the results easier.
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*/
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uint n= 0;
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while (n < length && src[n++]);
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memset(dst + n, (int) 'Z', length - n + 1);
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#endif
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while (length--)
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if (! (*dst++ = *src++))
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return dst-1;
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*dst=0;
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return dst;
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}
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