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/*
* cook - file construction tool
* Copyright (C) 1998, 2006, 2007 Peter Miller;
* All rights reserved.
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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, USA.
*
* MANIFEST: functions to substitute strings
*/
#include <common/ac/string.h>
#include <common/str.h>
#include <common/stracc.h>
string_ty *
str_substitute(string_ty *a, string_ty *b, string_ty *c)
{
char *cp;
char *ep;
static stracc sa;
sa_open(&sa);
cp = c->str_text;
ep = cp + c->str_length;
while (cp < ep)
{
if
(
(size_t)(ep - cp) < a->str_length
||
0 != memcmp(a->str_text, cp, a->str_length)
)
{
sa_char(&sa, *cp++);
}
else
{
sa_chars(&sa, b->str_text, b->str_length);
cp += a->str_length;
}
}
return sa_close(&sa);
}
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