Hello.
I requesting memory from the stack using the function alloca.
I know that the use of it is discourage, but I want use it anyways.
I write a code for windows that use it and I tested ok, but only when I
compile with gcc. Compiling it with tiny c fails, the program crash.
Maybe is a bug of tiny c.
This is the code:
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <malloc.h>
#include <setjmp.h>
int _resetstkoflw ( void );
static jmp_buf alloca_jmp_buf;
LONG WINAPI AllocaExceptionFilter(EXCEPTION_POINTERS *ExceptionInfo)
{
switch(ExceptionInfo->ExceptionRecord->ExceptionCode) {
case STATUS_STACK_OVERFLOW :
// reset the stack
if (0 == _resetstkoflw()) {
printf("Could not reset the stack!\n");
_exit(1);
}
longjmp(alloca_jmp_buf, 1);
break;
}
return EXCEPTION_EXECUTE_HANDLER;
}
//Alloca survive. Programmed by Carlos Montiers.
int main()
{
void * m;
int alloca_jmp_res;
LPTOP_LEVEL_EXCEPTION_FILTER prev;
//replace the exception filter function saving the previous
prev = SetUnhandledExceptionFilter(AllocaExceptionFilter);
alloca_jmp_res = setjmp(alloca_jmp_buf);
if ( (0 == alloca_jmp_res) ) {
m = alloca( INT_MAX );
} else if ( (1 == alloca_jmp_res) ) {
m = NULL;
}
//restore exception filter function
SetUnhandledExceptionFilter(prev);
if (! m) {
printf("alloca Failed\n");
}
printf("Bye\n");
return 1;
}
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