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/*
* hfsutils - tools for reading and writing Macintosh HFS volumes
* Copyright (C) 1996-1998 Robert Leslie
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: dstring.c,v 1.7 1998/11/02 22:08:28 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include <stdlib.h>
# include <string.h>
# include "dstring.h"
/*
* NAME: dstring->init()
* DESCRIPTION: initialize a new dynamic string
*/
void dstr_init(dstring *string)
{
string->str = string->sbuf;
string->len = 0;
string->space = sizeof(string->sbuf);
string->sbuf[0] = 0;
}
/*
* NAME: dstring->append()
* DESCRIPTION: append to a dynamic string
*/
int dstr_append(dstring *string, const char *str, size_t len)
{
size_t newlen;
if (len == (size_t) -1)
len = strlen(str);
newlen = string->len + len;
/* make sure there is room */
if (newlen >= string->space)
{
char *new;
newlen *= 2;
new = malloc(newlen);
if (new == 0)
return -1;
string->space = newlen;
memcpy(new, string->str, string->len);
if (string->str != string->sbuf)
free(string->str);
string->str = new;
}
/* append the string */
memcpy(string->str + string->len, str, len);
string->len += len;
string->str[string->len] = 0;
return 0;
}
/*
* NAME: dstring->string()
* DESCRIPTION: return a pointer to a dynamic string's content
*/
char *dstr_string(dstring *string)
{
return string->str;
}
/*
* NAME: dstring->length()
* DESCRIPTION: return the length of a dynamic string
*/
int dstr_length(dstring *string)
{
return string->len;
}
/*
* NAME: dstring->shrink()
* DESCRIPTION: truncate a dynamic string to a shorter length
*/
void dstr_shrink(dstring *string, size_t len)
{
if (len < string->len)
string->len = len;
}
/*
* NAME: dstring->free()
* DESCRIPTION: free a dynamic string
*/
void dstr_free(dstring *string)
{
if (string->str != string->sbuf)
free(string->str);
}
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