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annotate src/iscygpty.c @ 16819:91619e48e1a7 v8.1.1411

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patch 8.1.1411: Coverity warns for divide by zero commit https://github.com/vim/vim/commit/7833dab73c658e65f38553af89fd60c57a11ef49 Author: Bram Moolenaar <Bram@vim.org> Date: Mon May 27 22:01:40 2019 +0200 patch 8.1.1411: Coverity warns for divide by zero Problem: Coverity warns for divide by zero. Solution: Make sure width is larger than zero.
author Bram Moolenaar <Bram@vim.org>
date Mon, 27 May 2019 22:15:05 +0200
parents 8412df1479a3
children 82c732e8d23d
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1 /*
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2 * iscygpty.c -- part of ptycheck
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3 * https://github.com/k-takata/ptycheck
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4 *
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5 * Copyright (c) 2015-2017 K.Takata
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6 *
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7 * You can redistribute it and/or modify it under the terms of either
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8 * the MIT license (as described below) or the Vim license.
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9 *
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10 * Permission is hereby granted, free of charge, to any person obtaining
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11 * a copy of this software and associated documentation files (the
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12 * "Software"), to deal in the Software without restriction, including
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13 * without limitation the rights to use, copy, modify, merge, publish,
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14 * distribute, sublicense, and/or sell copies of the Software, and to
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15 * permit persons to whom the Software is furnished to do so, subject to
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16 * the following conditions:
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17 *
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18 * The above copyright notice and this permission notice shall be
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19 * included in all copies or substantial portions of the Software.
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20 *
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21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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24 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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25 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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26 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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27 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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28 */
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29
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30 #ifdef _WIN32
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31
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32 #include <ctype.h>
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33 #include <io.h>
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34 #include <wchar.h>
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35 #include <windows.h>
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36
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37 #ifdef USE_FILEEXTD
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38 /* VC 7.1 or earlier doesn't support SAL. */
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39 # if !defined(_MSC_VER) || (_MSC_VER < 1400)
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40 # define __out
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41 # define __in
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42 # define __in_opt
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43 # endif
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44 /* Win32 FileID API Library:
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45 * http://www.microsoft.com/en-us/download/details.aspx?id=22599
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46 * Needed for WinXP. */
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47 # include <fileextd.h>
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48 #else /* USE_FILEEXTD */
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49 /* VC 8 or earlier. */
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50 # if defined(_MSC_VER) && (_MSC_VER < 1500)
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51 # ifdef ENABLE_STUB_IMPL
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52 # define STUB_IMPL
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53 # else
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54 # error "Win32 FileID API Library is required for VC2005 or earlier."
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55 # endif
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56 # endif
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57 #endif /* USE_FILEEXTD */
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60 #include "iscygpty.h"
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62 //#define USE_DYNFILEID
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63 #ifdef USE_DYNFILEID
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64 typedef BOOL (WINAPI *pfnGetFileInformationByHandleEx)(
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65 HANDLE hFile,
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66 FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
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67 LPVOID lpFileInformation,
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68 DWORD dwBufferSize);
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69 static pfnGetFileInformationByHandleEx pGetFileInformationByHandleEx = NULL;
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71 # ifndef USE_FILEEXTD
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72 static BOOL WINAPI stub_GetFileInformationByHandleEx(
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73 HANDLE hFile,
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74 FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
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75 LPVOID lpFileInformation,
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76 DWORD dwBufferSize)
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77 {
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78 return FALSE;
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79 }
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80 # endif
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81
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82 static void setup_fileid_api(void)
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83 {
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84 if (pGetFileInformationByHandleEx != NULL) {
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85 return;
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86 }
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87 pGetFileInformationByHandleEx = (pfnGetFileInformationByHandleEx)
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88 GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
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89 "GetFileInformationByHandleEx");
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90 if (pGetFileInformationByHandleEx == NULL) {
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91 # ifdef USE_FILEEXTD
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92 pGetFileInformationByHandleEx = GetFileInformationByHandleEx;
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93 # else
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94 pGetFileInformationByHandleEx = stub_GetFileInformationByHandleEx;
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95 # endif
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96 }
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97 }
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98 #else
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99 # define pGetFileInformationByHandleEx GetFileInformationByHandleEx
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100 # define setup_fileid_api()
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101 #endif
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102
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103
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104 #define is_wprefix(s, prefix) \
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105 (wcsncmp((s), (prefix), sizeof(prefix) / sizeof(WCHAR) - 1) == 0)
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106
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107 /* Check if the fd is a cygwin/msys's pty. */
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108 int is_cygpty(int fd)
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109 {
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110 #ifdef STUB_IMPL
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111 return 0;
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112 #else
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113 HANDLE h;
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114 int size = sizeof(FILE_NAME_INFO) + sizeof(WCHAR) * (MAX_PATH - 1);
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115 FILE_NAME_INFO *nameinfo;
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116 WCHAR *p = NULL;
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117
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118 setup_fileid_api();
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119
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120 h = (HANDLE) _get_osfhandle(fd);
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121 if (h == INVALID_HANDLE_VALUE) {
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122 return 0;
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123 }
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124 /* Cygwin/msys's pty is a pipe. */
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125 if (GetFileType(h) != FILE_TYPE_PIPE) {
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126 return 0;
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127 }
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128 nameinfo = malloc(size + sizeof(WCHAR));
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129 if (nameinfo == NULL) {
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130 return 0;
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131 }
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132 /* Check the name of the pipe:
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133 * '\{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master' */
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134 if (pGetFileInformationByHandleEx(h, FileNameInfo, nameinfo, size)) {
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135 nameinfo->FileName[nameinfo->FileNameLength / sizeof(WCHAR)] = L'\0';
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136 p = nameinfo->FileName;
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137 if (is_wprefix(p, L"\\cygwin-")) { /* Cygwin */
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138 p += 8;
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139 } else if (is_wprefix(p, L"\\msys-")) { /* MSYS and MSYS2 */
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140 p += 6;
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141 } else {
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142 p = NULL;
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143 }
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144 if (p != NULL) {
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145 while (*p && isxdigit(*p)) /* Skip 16-digit hexadecimal. */
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146 ++p;
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147 if (is_wprefix(p, L"-pty")) {
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148 p += 4;
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149 } else {
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150 p = NULL;
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151 }
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152 }
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153 if (p != NULL) {
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154 while (*p && isdigit(*p)) /* Skip pty number. */
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155 ++p;
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156 if (is_wprefix(p, L"-from-master")) {
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157 //p += 12;
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158 } else if (is_wprefix(p, L"-to-master")) {
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159 //p += 10;
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160 } else {
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161 p = NULL;
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162 }
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163 }
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164 }
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165 free(nameinfo);
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166 return (p != NULL);
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167 #endif /* STUB_IMPL */
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168 }
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169
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170 /* Check if at least one cygwin/msys pty is used. */
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171 int is_cygpty_used(void)
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172 {
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173 int fd, ret = 0;
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174
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175 for (fd = 0; fd < 3; fd++) {
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176 ret |= is_cygpty(fd);
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177 }
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178 return ret;
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179 }
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180
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181 #endif /* _WIN32 */
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182
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183 /* vim: set ts=4 sw=4: */