stack.c

   1 /* agg - the news aggregator
   2  * Copyright (C) 2011 Andreas Waidler <arandes@programmers.at>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #include <string.h>
  17 #include "stack.h"
  18 #include "fail.h"
  19 #include "rss.h"
  20
  21 #define STACK_LAYERS 3
  22
  23 void unknown_enter(const char* elem, const char** attr);
  24 void unknown_leave(const char* elem);
  25
  26 struct Layer _stack[STACK_LAYERS] = { { unknown_enter, unknown_leave } };
  27 unsigned int _top = 0;
  28
  29 const struct Layer* stack_top()
  30 {
  31         return &_stack[_top];
  32 }
  33
  34 void stack_next()
  35 {
  36         ++_top;
  37 }
  38
  39 void stack_prev()
  40 {
  41         --_top;
  42 }
  43
  44 void stack_set(unsigned i, struct Layer l)
  45 {
  46         if (i >= STACK_LAYERS) fail(ERR_STACK);
  47
  48         _stack[i].enter = l.enter;
  49         _stack[i].leave = l.leave;
  50 }
  51
  52 void unknown_enter(const char* elem, const char** attr)
  53 {
  54         (void) attr;
  55
  56         if (strcmp("rss", elem) != 0) fail(ERR_TYPE);
  57
  58         rss_setup();
  59 }
  60
  61 void unknown_leave(const char* elem)
  62 {
  63         (void) elem;
  64
  65         fail(ERR_STACK);
  66 }