1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/**
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the mingw-w64 runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <windows.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* emulation of _vscprintf() via _vsnprintf() */
static int __cdecl emu_vscprintf(const char * __restrict__ format, va_list arglist)
{
char *buffer, *new_buffer;
size_t size;
int ret;
/* if format is a null pointer, _vscprintf() returns -1 and sets errno to EINVAL */
if (!format) {
_set_errno(EINVAL);
return -1;
}
/* size for _vsnprintf() must be non-zero and buffer must have place for terminating null character */
size = strlen(format) * 2 + 1;
buffer = malloc(size);
if (!buffer) {
_set_errno(ENOMEM);
return -1;
}
/* if the number of characters to write is greater than size, _vsnprintf() returns -1 */
while (size < SIZE_MAX/2 && (ret = _vsnprintf(buffer, size, format, arglist)) < 0) {
/* in this case try with larger buffer */
size *= 2;
new_buffer = realloc(buffer, size);
if (!new_buffer)
break;
buffer = new_buffer;
}
free(buffer);
if (ret < 0) {
_set_errno(ENOMEM);
return -1;
}
return ret;
}
#ifndef __LIBMSVCRT_OS__
int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__, va_list) = emu_vscprintf;
#else
#include <msvcrt.h>
static int __cdecl init_vscprintf(const char * __restrict__ format, va_list arglist);
int (__cdecl *__MINGW_IMP_SYMBOL(_vscprintf))(const char * __restrict__, va_list) = init_vscprintf;
static int __cdecl init_vscprintf(const char * __restrict__ format, va_list arglist)
{
HMODULE msvcrt = __mingw_get_msvcrt_handle();
int (__cdecl *func)(const char * __restrict__, va_list) = NULL;
if (msvcrt)
func = (int (__cdecl *)(const char * __restrict__, va_list))GetProcAddress(msvcrt, "_vscprintf");
if (!func)
func = emu_vscprintf;
return (__MINGW_IMP_SYMBOL(_vscprintf) = func)(format, arglist);
}
#endif
int __cdecl _vscprintf(const char * __restrict__ format, va_list arglist)
{
return __MINGW_IMP_SYMBOL(_vscprintf)(format, arglist);
}
|
