tc_break.c

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/*
** Copyright (C) 2004, 2005 by Kevin L. Mitchell <klmitch@mit.edu>
**
** 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**
** @(#)$Id: tc_break.c,v 1.3 2005/06/07 04:53:50 klmitch Exp $
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "treeconf_int.h"

RCSTAG("@(#)$Id: tc_break.c,v 1.3 2005/06/07 04:53:50 klmitch Exp $");

struct stringbuf {
  treeconf_str_t       *sb_comps;   
  int             sb_count;   
  int             sb_size;    
};

#define STRINGBUF_INIT        { 0, 0, 0 }

#define STRINGBUF_CHUNK       10

static unsigned int
_add_string(struct stringbuf *buf, const char *str, int len)
{
  treeconf_str_t *tmp = 0;

  if (buf->sb_count + 1 >= buf->sb_size) { /* need more space? */
    if (!(tmp = (treeconf_str_t *)realloc(buf->sb_comps,
                                sizeof(treeconf_str_t) *
                                (buf->sb_size + STRINGBUF_CHUNK))))
      return ENOMEM;
    else {
      buf->sb_comps = tmp; /* OK, remember the new space */
      buf->sb_size += STRINGBUF_CHUNK;
    }
  }

  buf->sb_comps[buf->sb_count].ts_string = str; /* store the string */
  buf->sb_comps[buf->sb_count].ts_length = len;

  buf->sb_count++; /* increment the count... */

  return 0; /* And return success! */
}

unsigned int
tc_break(treeconf_str_t **str_p, int *cnt_p, const char *name,
       const char *delims)
{
  struct stringbuf buf = STRINGBUF_INIT;
  char *tmp;
  unsigned int err = 0;

  initialize_trcf_error_table();

  if (!str_p || !cnt_p || !name || !*name) /* um, is it a good name? */
    return EINVAL;

  while ((tmp = strpbrk(name, delims))) { /* go through string components */
    if ((err = _add_string(&buf, name, tmp - name))) {
      free(buf.sb_comps);
      return err;
    }
    name = tmp + 1;
  }

  /* Add the last component */
  if ((err = _add_string(&buf, name, strlen(name)))) {
    free(buf.sb_comps);
    return err;
  }

  /* Return the results */
  *str_p = buf.sb_comps;
  *cnt_p = buf.sb_count;

  return 0; /* we succeeded! */
}

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