stack.c

   1 #include <string.h>
   2 #include "stack.h"
   3 #include "fail.h"
   4 #include "rss.h"
   5
   6 #define STACK_LAYERS 3
   7
   8 void unknown_enter(const char* elem, const char** attr);
   9 void unknown_leave(const char* elem);
  10
  11 struct Layer _stack[STACK_LAYERS] = { { unknown_enter, unknown_leave } };
  12 unsigned int _top = 0;
  13
  14 const struct Layer* stack_top()
  15 {
  16         return &_stack[_top];
  17 }
  18
  19 void stack_next()
  20 {
  21         ++_top;
  22 }
  23
  24 void stack_prev()
  25 {
  26         --_top;
  27 }
  28
  29 void stack_set(unsigned i, struct Layer l)
  30 {
  31         if (i >= STACK_LAYERS) fail(ERR_STACK);
  32
  33         _stack[i].enter = l.enter;
  34         _stack[i].leave = l.leave;
  35 }
  36
  37 void unknown_enter(const char* elem, const char** attr)
  38 {
  39         (void) attr;
  40
  41         if (strcmp("rss", elem) != 0) fail(ERR_TYPE);
  42
  43         rss_setup();
  44 }
  45
  46 void unknown_leave(const char* elem)
  47 {
  48         (void) elem;
  49
  50         fail(ERR_STACK);
  51 }