zig/lib/libc/mingw/misc/mingw_wcstof.c
Andrew Kelley 49d1a4c562 move lib dirs to lib subdir
also start prefering NtDll API. so far:
 * NtQueryInformationFile
 * NtClose

adds a performance workaround for windows unicode conversion. but that
should probably be removed before merging
2019-07-15 17:54:50 -04:00

32 lines
801 B
C

#include <windows.h>
#include <stdio.h>
float __cdecl
__mingw_wcstof (const wchar_t * __restrict__ _Str, wchar_t ** __restrict__ _EndPtr);
float __cdecl
__mingw_wcstof (const wchar_t * __restrict__ _Str, wchar_t ** __restrict__ _EndPtr)
{
float r;
char *n, *ep = NULL;
size_t l, l2;
l = WideCharToMultiByte(CP_UTF8, 0, _Str, -1, NULL, 0, NULL, NULL);
n = alloca (l + 1);
if (l != 0) WideCharToMultiByte (CP_UTF8, 0, _Str, -1, n, l, NULL, NULL);
n[l] = 0;
r = __mingw_strtof (n, &ep);
if (ep != NULL)
{
*ep = 0;
l2 = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, n, -1, NULL, 0);
if (l2 > 0)
l2 -= 1; /* Remove zero terminator from length. */
if (_EndPtr) *_EndPtr = (wchar_t *) &_Str[l2];
}
else
if (_EndPtr) *_EndPtr = NULL;
return r;
}