| 1 | /** |
| 2 | * This file has no copyright assigned and is placed in the Public Domain. |
| 3 | * This file is part of the mingw-w64 runtime package. |
| 4 | * No warranty is given; refer to the file DISCLAIMER.PD within this package. |
| 5 | */ |
| 6 | |
| 7 | #ifndef WIN32_LEAN_AND_MEAN |
| 8 | #define WIN32_LEAN_AND_MEAN |
| 9 | #endif |
| 10 | #include <windows.h> |
| 11 | #include <locale.h> |
| 12 | |
| 13 | static BOOL WINAPI fallback_IsDBCSLeadByteEx(UINT cp, BYTE c) |
| 14 | { |
| 15 | int i; |
| 16 | CPINFO cp_info; |
| 17 | if (GetCPInfo(cp, &cp_info) && cp_info.MaxCharSize == 2) { |
| 18 | for (i = 0; i < MAX_LEADBYTES && cp_info.LeadByte[i]; i += 2) { |
| 19 | if (c >= cp_info.LeadByte[i] && c <= cp_info.LeadByte[i+1]) |
| 20 | return TRUE; |
| 21 | } |
| 22 | } |
| 23 | return FALSE; |
| 24 | } |
| 25 | |
| 26 | _Static_assert(__builtin_types_compatible_p(__typeof__(fallback_IsDBCSLeadByteEx), __typeof__(IsDBCSLeadByteEx)), |
| 27 | "Functions fallback_IsDBCSLeadByteEx() and IsDBCSLeadByteEx() are not compatible"); |
| 28 | |
| 29 | int __cdecl __mingw_isleadbyte_cp(int c, unsigned int cp) |
| 30 | { |
| 31 | static __typeof__(IsDBCSLeadByteEx) *call_IsDBCSLeadByteEx = NULL; |
| 32 | if (!call_IsDBCSLeadByteEx) { |
| 33 | FARPROC farproc = NULL; |
| 34 | HMODULE kernel32 = GetModuleHandleA("kernel32.dll"); |
| 35 | if (kernel32) |
| 36 | farproc = GetProcAddress(kernel32, "IsDBCSLeadByteEx"); |
| 37 | if (!farproc) |
| 38 | farproc = (FARPROC)(PVOID)fallback_IsDBCSLeadByteEx; |
| 39 | (void)InterlockedExchangePointer((PVOID*)&call_IsDBCSLeadByteEx, (PVOID)farproc); |
| 40 | } |
| 41 | return call_IsDBCSLeadByteEx(cp, c); |
| 42 | } |