wine/dlls/msvcrt/misc.c
2006-01-14 17:27:28 +01:00

170 lines
4.6 KiB
C

/*
* msvcrt.dll misc functions
*
* Copyright 2000 Jon Griffiths
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdlib.h>
#include "msvcrt.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
/*********************************************************************
* _beep (MSVCRT.@)
*/
void _beep( unsigned int freq, unsigned int duration)
{
TRACE(":Freq %d, Duration %d\n",freq,duration);
Beep(freq, duration);
}
/*********************************************************************
* srand (MSVCRT.@)
*/
void MSVCRT_srand( unsigned int seed )
{
thread_data_t *data = msvcrt_get_thread_data();
data->random_seed = seed;
}
/*********************************************************************
* rand (MSVCRT.@)
*/
int MSVCRT_rand(void)
{
thread_data_t *data = msvcrt_get_thread_data();
/* this is the algorithm used by MSVC, according to
* http://en.wikipedia.org/wiki/List_of_pseudorandom_number_generators */
data->random_seed = data->random_seed * 214013 + 2531011;
return (data->random_seed >> 16) & MSVCRT_RAND_MAX;
}
/*********************************************************************
* _sleep (MSVCRT.@)
*/
void _sleep(unsigned long timeout)
{
TRACE("_sleep for %ld milliseconds\n",timeout);
Sleep((timeout)?timeout:1);
}
/*********************************************************************
* _lfind (MSVCRT.@)
*/
void* _lfind(const void* match, const void* start,
unsigned int* array_size, unsigned int elem_size,
int (*cf)(const void*,const void*) )
{
unsigned int size = *array_size;
if (size)
do
{
if (cf(match, start) == 0)
return (void *)start; /* found */
start = (char*)start + elem_size;
} while (--size);
return NULL;
}
/*********************************************************************
* _lsearch (MSVCRT.@)
*/
void* _lsearch(const void* match, void* start,
unsigned int* array_size, unsigned int elem_size,
int (*cf)(const void*,const void*) )
{
unsigned int size = *array_size;
if (size)
do
{
if (cf(match, start) == 0)
return start; /* found */
start = (char*)start + elem_size;
} while (--size);
/* not found, add to end */
memcpy(start, match, elem_size);
array_size[0]++;
return start;
}
/*********************************************************************
* _chkesp (MSVCRT.@)
*
* Trap to a debugger if the value of the stack pointer has changed.
*
* PARAMS
* None.
*
* RETURNS
* Does not return.
*
* NOTES
* This function is available for iX86 only.
*
* When VC++ generates debug code, it stores the value of the stack pointer
* before calling any external function, and checks the value following
* the call. It then calls this function, which will trap if the values are
* not the same. Usually this means that the prototype used to call
* the function is incorrect. It can also mean that the .spec entry has
* the wrong calling convention or parameters.
*/
#ifdef __i386__
# ifdef __GNUC__
__ASM_GLOBAL_FUNC(_chkesp,
"jnz 1f\n\t"
"ret\n"
"1:\tpushl %ebp\n\t"
"movl %esp,%ebp\n\t"
"subl $12,%esp\n\t"
"pushl %eax\n\t"
"pushl %ecx\n\t"
"pushl %edx\n\t"
"call " __ASM_NAME("MSVCRT_chkesp_fail") "\n\t"
"popl %edx\n\t"
"popl %ecx\n\t"
"popl %eax\n\t"
"leave\n\t"
"ret");
void MSVCRT_chkesp_fail(void)
{
ERR("Stack pointer incorrect after last function call - Bad prototype/spec entry?\n");
DebugBreak();
}
# else /* __GNUC__ */
/**********************************************************************/
void _chkesp(void)
{
}
# endif /* __GNUC__ */
#endif /* __i386__ */