src/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 <assert.h>
  18 #include "stack.h"
  19 #include "fail.h"
  20 #include "rss.h"
  21
  22 #define STACK_LAYERS 3
  23
  24 void unknown_enter(const char* elem, const char** attr);
  25 void unknown_leave(const char* elem);
  26
  27 struct Layer _stack[STACK_LAYERS] = { { unknown_enter, unknown_leave } };
  28 unsigned int _top = 0;
  29
  30 /* FIXME init */
  31
  32 const struct Layer* stack_top()
  33 {
  34         assert(_top < STACK_LAYERS);
  35         /* FIXME */
  36         /* assert(_stack[_top].enter) */
  37         /* assert(_stack[_top].leave) */
  38
  39         return &_stack[_top];
  40 }
  41
  42 void stack_next()
  43 {
  44         assert(_top < STACK_LAYERS - 1);
  45         ++_top;
  46 }
  47
  48 void stack_prev()
  49 {
  50         assert(_top > 0);
  51         --_top;
  52 }
  53
  54 void stack_set(unsigned i, struct Layer l)
  55 {
  56         assert(i < STACK_LAYERS);
  57
  58         _stack[i].enter = l.enter;
  59         _stack[i].leave = l.leave;
  60 }
  61
  62 void unknown_enter(const char* elem, const char** attr)
  63 {
  64         (void) attr;
  65
  66         assert(!strcmp("rss", elem));
  67
  68         rss_setup();
  69 }
  70
  71 void unknown_leave(const char* elem)
  72 {
  73         (void) elem;
  74
  75         assert(0);
  76 }