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/*
* iscygpty.c -- part of ptycheck
* https://github.com/k-takata/ptycheck
*
* Copyright (c) 2015-2023 K.Takata
*
* You can redistribute it and/or modify it under the terms of either
* the MIT license (as described below) or the Vim license.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifdef _WIN32
#include <ctype.h>
#include <io.h>
#include <wchar.h>
#include <windows.h>
#ifdef USE_FILEEXTD
// VC 7.1 or earlier doesn't support SAL.
# if !defined(_MSC_VER) || (_MSC_VER < 1400)
# define __out
# define __in
# define __in_opt
# endif
// Win32 FileID API Library:
// http://www.microsoft.com/en-us/download/details.aspx?id=22599
// Needed for WinXP.
# include <fileextd.h>
#else // USE_FILEEXTD
// VC 8 or earlier.
# if defined(_MSC_VER) && (_MSC_VER < 1500)
# ifdef ENABLE_STUB_IMPL
# define STUB_IMPL
# else
# error "Win32 FileID API Library is required for VC2005 or earlier."
# endif
# endif
#endif // USE_FILEEXTD
#ifdef __MINGW32__
# define UNUSED __attribute__((unused))
#else
# define UNUSED
#endif
#include "iscygpty.h"
//#define USE_DYNFILEID
#ifdef USE_DYNFILEID
typedef BOOL (WINAPI *pfnGetFileInformationByHandleEx)(
HANDLE hFile,
FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
LPVOID lpFileInformation,
DWORD dwBufferSize);
static pfnGetFileInformationByHandleEx pGetFileInformationByHandleEx = NULL;
# ifndef USE_FILEEXTD
static BOOL WINAPI stub_GetFileInformationByHandleEx(
HANDLE hFile UNUSED,
FILE_INFO_BY_HANDLE_CLASS FileInformationClass UNUSED,
LPVOID lpFileInformation UNUSED,
DWORD dwBufferSize UNUSED)
{
return FALSE;
}
# endif
static void setup_fileid_api(void)
{
if (pGetFileInformationByHandleEx != NULL) {
return;
}
pGetFileInformationByHandleEx = (pfnGetFileInformationByHandleEx)
GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
"GetFileInformationByHandleEx");
if (pGetFileInformationByHandleEx == NULL) {
# ifdef USE_FILEEXTD
pGetFileInformationByHandleEx = GetFileInformationByHandleEx;
# else
pGetFileInformationByHandleEx = stub_GetFileInformationByHandleEx;
# endif
}
}
#else
# define pGetFileInformationByHandleEx GetFileInformationByHandleEx
# define setup_fileid_api()
#endif
#define is_wprefix(s, prefix) \
(wcsncmp((s), (prefix), sizeof(prefix) / sizeof(WCHAR) - 1) == 0)
// Check if the fd is a cygwin/msys's pty.
int is_cygpty(int fd)
{
#ifdef STUB_IMPL
return 0;
#else
HANDLE h;
const int size = sizeof(FILE_NAME_INFO) + sizeof(WCHAR) * (MAX_PATH - 1);
FILE_NAME_INFO *nameinfo;
WCHAR *p = NULL;
setup_fileid_api();
h = (HANDLE) _get_osfhandle(fd);
if (h == INVALID_HANDLE_VALUE) {
return 0;
}
// Cygwin/msys's pty is a pipe.
if (GetFileType(h) != FILE_TYPE_PIPE) {
return 0;
}
nameinfo = malloc(size + sizeof(WCHAR));
if (nameinfo == NULL) {
return 0;
}
// Check the name of the pipe:
// "\\{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master"
if (pGetFileInformationByHandleEx(h, FileNameInfo, nameinfo, size)) {
nameinfo->FileName[nameinfo->FileNameLength / sizeof(WCHAR)] = L'\0';
p = nameinfo->FileName;
if (is_wprefix(p, L"\\cygwin-")) { // Cygwin
p += 8;
} else if (is_wprefix(p, L"\\msys-")) { // MSYS and MSYS2
p += 6;
} else {
p = NULL;
}
if (p != NULL) {
// Skip 16-digit hexadecimal.
while (*p && iswascii(*p) && isxdigit(*p))
++p;
if (is_wprefix(p, L"-pty")) {
p += 4;
} else {
p = NULL;
}
}
if (p != NULL) {
// Skip pty number.
while (*p && iswascii(*p) && isdigit(*p))
++p;
if (is_wprefix(p, L"-from-master")) {
//p += 12;
} else if (is_wprefix(p, L"-to-master")) {
//p += 10;
} else {
p = NULL;
}
}
}
free(nameinfo);
return (p != NULL);
#endif // STUB_IMPL
}
// Check if at least one cygwin/msys pty is used.
int is_cygpty_used(void)
{
int fd, ret = 0;
for (fd = 0; fd < 3; fd++) {
ret |= is_cygpty(fd);
}
return ret;
}
#endif // _WIN32
// vim: set ts=4 sw=4:
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