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/* str/alloc.c - Allocate storage for a string
* Copyright (C) 2002-2005 Bruce Guenter <bruce@untroubled.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <string.h>
#include "str.h"
/** Allocate storage for a string.
*
* \param s String to modify.
* \param size Minimum number of bytes for which to allocate.
* \param copy If set, the existing string will be copied into the new string.
*
* The size given is incremented to account for adding a trailing \c NUL
* byte (to ensure compatibility with C string functions) and is then
* rounded up to the nearest \c STR_BLOCKSIZE interval.
*/
int str_alloc(str* s, unsigned size, int copy)
{
char* news;
unsigned newsize;
/* overflow protection */
if ((newsize = size + 1) < size)
return 0;
if (newsize >= s->size) {
newsize += newsize/8 + STR_BLOCKSIZE-1;
newsize -= newsize % STR_BLOCKSIZE;
/* more overflow protection */
if (newsize <= size)
return 0;
if ((news = copy ? realloc(s->s, newsize) : malloc(newsize)) == 0)
return 0;
if (!copy)
free(s->s);
s->size = newsize;
s->s = news;
}
return 1;
}
#ifdef SELFTEST_MAIN
void test(str* s, unsigned size)
{
debugstrfn(str_alloc(s, size, 0), s);
}
MAIN
{
static str s;
test(&s, 0);
test(&s, 1);
test(&s, 14);
test(&s, 15);
test(&s, 16);
}
#endif
#ifdef SELFTEST_EXP
result=1 len=0 size=16 s=
result=1 len=0 size=16 s=
result=1 len=0 size=16 s=
result=1 len=0 size=32 s=
result=1 len=0 size=32 s=
#endif
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