120 lines
2.7 KiB
C
120 lines
2.7 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: dlist.c,v 1.7 1998/11/02 22:08:27 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 "dlist.h"
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/*
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* NAME: dlist->init()
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* DESCRIPTION: initialize a new dynamic list
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*/
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int dl_init(dlist *list)
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{
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list->memsz = 100;
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list->mem = malloc(list->memsz);
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if (list->mem == 0)
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return -1;
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list->eltend = (char **) list->mem;
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list->strs = list->mem + list->memsz;
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return 0;
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}
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/*
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* NAME: dlist->free()
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* DESCRIPTION: dispose of a dynamic list
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*/
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void dl_free(dlist *list)
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{
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free(list->mem);
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}
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/*
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* NAME: dlist->array()
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* DESCRIPTION: return the array of strings in a list; can dispose with free()
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*/
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char **dl_array(dlist *list)
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{
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return (char **) list->mem;
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}
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/*
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* NAME: dlist->size()
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* DESCRIPTION: return the number of strings in a list
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*/
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int dl_size(dlist *list)
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{
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return list->eltend - (char **) list->mem;
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}
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/*
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* NAME: dlist->append()
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* DESCRIPTION: insert a string to the end of a list
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*/
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int dl_append(dlist *list, const char *str)
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{
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size_t len;
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len = strlen(str) + 1;
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/* make sure there is room */
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if (sizeof(char *) + len > (size_t) (list->strs - (char *) list->eltend))
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{
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dlist newlist;
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size_t strsz;
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char **elt;
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strsz = (list->mem + list->memsz) - list->strs;
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newlist.memsz = list->memsz * 2 + sizeof(char *) + len;
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newlist.mem = malloc(newlist.memsz);
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if (newlist.mem == 0)
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return -1;
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newlist.eltend = (char **) newlist.mem;
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newlist.strs = newlist.mem + newlist.memsz - strsz;
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memcpy(newlist.strs, list->strs, strsz);
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for (elt = (char **) list->mem; elt < list->eltend; ++elt)
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*newlist.eltend++ = newlist.strs + (*elt - list->strs);
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free(list->mem);
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*list = newlist;
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}
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list->strs -= len;
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strcpy(list->strs, str);
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*list->eltend++ = list->strs;
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return 0;
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}
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