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