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//
// aegis - project change supervisor
// Copyright (C) 2004-2006, 2008, 2009 Peter Miller
//
// 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 3 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, see
// <http://www.gnu.org/licenses/>.
#include <common/ac/string.h>
#include <common/str.h>
#include <common/stracc.h>
string_ty *
str_replace(string_ty *str, string_ty *lhs, string_ty *rhs, int how_many_times)
{
static stracc_t sa;
//
// Deal with some trivial cases.
//
if (lhs->str_length == 0 || how_many_times == 0)
return str_copy(str);
//
// Default the number of times, if necessary.
//
if (how_many_times < 0)
how_many_times = str->str_length + 1;
//
// Walk along the string replacing things.
//
const char *ip = str->str_text;
const char *ip_end = str->str_text + str->str_length;
sa.clear();
while (ip < ip_end && (size_t)(ip_end - ip) >= lhs->str_length)
{
const void *p = memmem(ip, ip_end - ip, lhs->str_text, lhs->str_length);
if (!p)
break;
const char *pp = (const char *)p;
sa.push_back(ip, pp - ip);
ip = pp;
sa.push_back(rhs->str_text, rhs->str_length);
ip += (lhs->str_length ? lhs->str_length : 1);
if (--how_many_times <= 0)
break;
}
//
// Collect the tail-end of the input.
//
sa.push_back(ip, ip_end - ip);
//
// Build ther answer.
//
return sa.mkstr();
}
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