2 * msvcrt.dll misc functions
4 * Copyright 2000 Jon Griffiths
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.
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.
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
22 #include "wine/port.h"
27 #include "wine/debug.h"
30 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
33 /*********************************************************************
36 void CDECL _beep( unsigned int freq, unsigned int duration)
38 TRACE(":Freq %d, Duration %d\n",freq,duration);
42 /*********************************************************************
45 void CDECL MSVCRT_srand( unsigned int seed )
47 thread_data_t *data = msvcrt_get_thread_data();
48 data->random_seed = seed;
51 /*********************************************************************
54 int CDECL MSVCRT_rand(void)
56 thread_data_t *data = msvcrt_get_thread_data();
58 /* this is the algorithm used by MSVC, according to
59 * http://en.wikipedia.org/wiki/List_of_pseudorandom_number_generators */
60 data->random_seed = data->random_seed * 214013 + 2531011;
61 return (data->random_seed >> 16) & MSVCRT_RAND_MAX;
64 /*********************************************************************
67 int CDECL MSVCRT_rand_s(unsigned int *pval)
69 if (!pval || !RtlGenRandom(pval, sizeof(*pval)))
71 *MSVCRT__errno() = MSVCRT_EINVAL;
77 /*********************************************************************
80 void CDECL MSVCRT__sleep(MSVCRT_ulong timeout)
82 TRACE("_sleep for %d milliseconds\n",timeout);
83 Sleep((timeout)?timeout:1);
86 /*********************************************************************
89 void* CDECL _lfind(const void* match, const void* start,
90 unsigned int* array_size, unsigned int elem_size,
91 int (*cf)(const void*,const void*) )
93 unsigned int size = *array_size;
97 if (cf(match, start) == 0)
98 return (void *)start; /* found */
99 start = (const char *)start + elem_size;
104 /*********************************************************************
105 * _lsearch (MSVCRT.@)
107 void* CDECL _lsearch(const void* match, void* start,
108 unsigned int* array_size, unsigned int elem_size,
109 int (*cf)(const void*,const void*) )
111 unsigned int size = *array_size;
115 if (cf(match, start) == 0)
116 return start; /* found */
117 start = (char*)start + elem_size;
120 /* not found, add to end */
121 memcpy(start, match, elem_size);
126 /*********************************************************************
129 * Trap to a debugger if the value of the stack pointer has changed.
138 * This function is available for iX86 only.
140 * When VC++ generates debug code, it stores the value of the stack pointer
141 * before calling any external function, and checks the value following
142 * the call. It then calls this function, which will trap if the values are
143 * not the same. Usually this means that the prototype used to call
144 * the function is incorrect. It can also mean that the .spec entry has
145 * the wrong calling convention or parameters.
151 __ASM_GLOBAL_FUNC(_chkesp,
155 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
156 __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
158 __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
163 "call " __ASM_NAME("MSVCRT_chkesp_fail") "\n\t"
168 __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
169 __ASM_CFI(".cfi_same_value %ebp\n\t")
172 void CDECL MSVCRT_chkesp_fail(void)
174 ERR("Stack pointer incorrect after last function call - Bad prototype/spec entry?\n");
178 # else /* __GNUC__ */
180 /**********************************************************************/
182 void CDECL _chkesp(void)
186 # endif /* __GNUC__ */
188 #endif /* __i386__ */