dlls/msvcrt/misc.c

   1 /*
   2  * msvcrt.dll misc functions
   3  *
   4  * Copyright 2000 Jon Griffiths
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdlib.h>
  25
  26 #include "msvcrt.h"
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
  30
  31
  32 /*********************************************************************
  33  *              _beep (MSVCRT.@)
  34  */
  35 void CDECL _beep( unsigned int freq, unsigned int duration)
  36 {
  37     TRACE(":Freq %d, Duration %d\n",freq,duration);
  38     Beep(freq, duration);
  39 }
  40
  41 /*********************************************************************
  42  *              srand (MSVCRT.@)
  43  */
  44 void CDECL MSVCRT_srand( unsigned int seed )
  45 {
  46     thread_data_t *data = msvcrt_get_thread_data();
  47     data->random_seed = seed;
  48 }
  49
  50 /*********************************************************************
  51  *              rand (MSVCRT.@)
  52  */
  53 int CDECL MSVCRT_rand(void)
  54 {
  55     thread_data_t *data = msvcrt_get_thread_data();
  56
  57     /* this is the algorithm used by MSVC, according to
  58      * http://en.wikipedia.org/wiki/List_of_pseudorandom_number_generators */
  59     data->random_seed = data->random_seed * 214013 + 2531011;
  60     return (data->random_seed >> 16) & MSVCRT_RAND_MAX;
  61 }
  62
  63 /*********************************************************************
  64  *              _sleep (MSVCRT.@)
  65  */
  66 void CDECL MSVCRT__sleep(MSVCRT_ulong timeout)
  67 {
  68   TRACE("_sleep for %d milliseconds\n",timeout);
  69   Sleep((timeout)?timeout:1);
  70 }
  71
  72 /*********************************************************************
  73  *              _lfind (MSVCRT.@)
  74  */
  75 void* CDECL _lfind(const void* match, const void* start,
  76                    unsigned int* array_size, unsigned int elem_size,
  77                    int (*cf)(const void*,const void*) )
  78 {
  79   unsigned int size = *array_size;
  80   if (size)
  81     do
  82     {
  83       if (cf(match, start) == 0)
  84         return (void *)start; /* found */
  85       start = (const char *)start + elem_size;
  86     } while (--size);
  87   return NULL;
  88 }
  89
  90 /*********************************************************************
  91  *              _lsearch (MSVCRT.@)
  92  */
  93 void* CDECL _lsearch(const void* match, void* start,
  94                      unsigned int* array_size, unsigned int elem_size,
  95                      int (*cf)(const void*,const void*) )
  96 {
  97   unsigned int size = *array_size;
  98   if (size)
  99     do
 100     {
 101       if (cf(match, start) == 0)
 102         return start; /* found */
 103       start = (char*)start + elem_size;
 104     } while (--size);
 105
 106   /* not found, add to end */
 107   memcpy(start, match, elem_size);
 108   array_size[0]++;
 109   return start;
 110 }
 111
 112 /*********************************************************************
 113  *              _chkesp (MSVCRT.@)
 114  *
 115  * Trap to a debugger if the value of the stack pointer has changed.
 116  *
 117  * PARAMS
 118  *  None.
 119  *
 120  * RETURNS
 121  *  Does not return.
 122  *
 123  * NOTES
 124  *  This function is available for iX86 only.
 125  *
 126  *  When VC++ generates debug code, it stores the value of the stack pointer
 127  *  before calling any external function, and checks the value following
 128  *  the call. It then calls this function, which will trap if the values are
 129  *  not the same. Usually this means that the prototype used to call
 130  *  the function is incorrect.  It can also mean that the .spec entry has
 131  *  the wrong calling convention or parameters.
 132  */
 133 #ifdef __i386__
 134
 135 # ifdef __GNUC__
 136
 137 __ASM_GLOBAL_FUNC(_chkesp,
 138                   "jnz 1f\n\t"
 139                   "ret\n"
 140                   "1:\tpushl %ebp\n\t"
 141                   "movl %esp,%ebp\n\t"
 142                   "subl $12,%esp\n\t"
 143                   "pushl %eax\n\t"
 144                   "pushl %ecx\n\t"
 145                   "pushl %edx\n\t"
 146                   "call " __ASM_NAME("MSVCRT_chkesp_fail") "\n\t"
 147                   "popl %edx\n\t"
 148                   "popl %ecx\n\t"
 149                   "popl %eax\n\t"
 150                   "leave\n\t"
 151                   "ret")
 152
 153 void CDECL MSVCRT_chkesp_fail(void)
 154 {
 155   ERR("Stack pointer incorrect after last function call - Bad prototype/spec entry?\n");
 156   DebugBreak();
 157 }
 158
 159 # else  /* __GNUC__ */
 160
 161 /**********************************************************************/
 162
 163 void CDECL _chkesp(void)
 164 {
 165 }
 166
 167 # endif  /* __GNUC__ */
 168
 169 #endif  /* __i386__ */