tabexp.c

   1 /*
   2  * Copyright 2004-2005 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #include <tabexp.h>
  21 #include <xmalloc.h>
  22 #include <xstrjoin.h>
  23 #include <debug.h>
  24
  25 #include <stdlib.h>
  26
  27 struct tabexp tabexp = {
  28         .head = NULL,
  29         .tails = NULL,
  30         .nr_tails = 0,
  31 };
  32
  33 /* index to tabexp.tails */
  34 static int tabexp_index = 0;
  35
  36 char *tabexp_expand(const char *src, void (*load_matches)(const char *src))
  37 {
  38         if (tabexp.tails == NULL) {
  39                 char *expanded;
  40
  41                 load_matches(src);
  42
  43                 if (tabexp.tails == NULL) {
  44                         BUG_ON(tabexp.head != NULL);
  45                         BUG_ON(tabexp.nr_tails != 0);
  46                         return NULL;
  47                 }
  48
  49                 BUG_ON(tabexp.head == NULL);
  50                 BUG_ON(tabexp.nr_tails < 1);
  51
  52                 expanded = xstrjoin(tabexp.head, tabexp.tails[0]);
  53                 if (tabexp.nr_tails == 1)
  54                         tabexp_reset();
  55                 return expanded;
  56         } else {
  57                 tabexp_index++;
  58                 tabexp_index %= tabexp.nr_tails;
  59                 return xstrjoin(tabexp.head, tabexp.tails[tabexp_index]);
  60         }
  61 }
  62
  63 void tabexp_reset(void)
  64 {
  65         int i;
  66
  67         for (i = 0; i < tabexp.nr_tails; i++)
  68                 free(tabexp.tails[i]);
  69         free(tabexp.tails);
  70         free(tabexp.head);
  71         tabexp.tails = NULL;
  72         tabexp.head = NULL;
  73         tabexp.nr_tails = 0;
  74
  75         tabexp_index = 0;
  76 }