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Change to make the lookahead array a std::stack instead of a static 4k list(!)

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This commit is contained in:
ridiculousfish
2012-11-24 16:58:30 -08:00
parent 464f1f44aa
commit e152cfac34
3 changed files with 65 additions and 47 deletions
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57
input_common.cpp
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@@ -14,6 +14,8 @@ Implementation file for the low level input library
#include <sys/types.h>
#include <unistd.h>
#include <wchar.h>
#include <stack>
#include <list>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
@@ -34,15 +36,30 @@ Implementation file for the low level input library
*/
#define WAIT_ON_ESCAPE 10
/**
Characters that have been read and returned by the sequence matching code
*/
static wint_t lookahead_arr[1024];
/** Characters that have been read and returned by the sequence matching code */
static std::stack<wint_t, std::list<wint_t> > lookahead_list;
/**
Number of entries in lookahead_arr
*/
static int lookahead_count = 0;
static bool has_lookahead(void)
{
return ! lookahead_list.empty();
}
static wint_t lookahead_pop(void)
{
wint_t result = lookahead_list.top();
lookahead_list.pop();
return result;
}
static void lookahead_push(wint_t c)
{
lookahead_list.push(c);
}
static wint_t lookahead_top(void)
{
return lookahead_list.top();
}
/** Callback function for handling interrupts on reading */
static int (*interrupt_handler)();
@@ -115,9 +132,9 @@ static wint_t readb()
{
return res;
}
if (lookahead_count)
if (has_lookahead())
{
return lookahead_arr[--lookahead_count];
return lookahead_pop();
}
}
@@ -144,18 +161,18 @@ static wint_t readb()
{
debug(3, L"Wake up on universal variable event");
env_universal_read_all();
if (lookahead_count)
if (has_lookahead())
{
return lookahead_arr[--lookahead_count];
return lookahead_pop();
}
}
if (ioport > 0 && FD_ISSET(ioport, &fdset))
{
iothread_service_completion();
if (lookahead_count)
if (has_lookahead())
{
return lookahead_arr[--lookahead_count];
return lookahead_pop();
}
}
@@ -179,7 +196,7 @@ static wint_t readb()
wchar_t input_common_readch(int timed)
{
if (lookahead_count == 0)
if (! has_lookahead())
{
if (timed)
{
@@ -247,19 +264,19 @@ wchar_t input_common_readch(int timed)
{
if (!timed)
{
while ((lookahead_count >= 0) && (lookahead_arr[lookahead_count-1] == WEOF))
lookahead_count--;
if (lookahead_count == 0)
while (has_lookahead() && lookahead_top() == WEOF)
lookahead_pop();
if (! has_lookahead())
return input_common_readch(0);
}
return lookahead_arr[--lookahead_count];
return lookahead_pop();
}
}
void input_common_unreadch(wint_t ch)
{
lookahead_arr[lookahead_count++] = ch;
lookahead_push(ch);
}