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68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates.
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Copyright (c) 2009-2011, Monty Program Ab
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Use is subject to license terms.
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Copyright (c) 2009-2011, Monty Program Ab
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 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 "strings_def.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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while (length--)
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{
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if (! (*dst++ = *src++))
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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 accommodate the terminating
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'\0'. This is easy to get wrong, so we make sure we write to
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the entire length of the buffer to identify incorrect
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buffer-sizes. We only initialism the "unused" part of the
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buffer here, a) for efficiency, and b) because dst==src is
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allowed, so initializing the entire buffer would overwrite the
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source-string. Also, we write a character rather than '\0' as
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this makes spotting these problems in the results easier.
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If we are using purify/valgrind, we only set one character at
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end to be able to detect also wrong accesses after the end of
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dst.
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*/
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if (length)
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{
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#ifdef HAVE_valgrind
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dst[length-1]= 'Z';
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#else
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bfill(dst, length-1, (int) 'Z');
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#endif /* HAVE_valgrind */
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}
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#endif /* EXTRA_DEBUG */
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return dst-1;
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}
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}
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*dst=0;
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return dst;
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}
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