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853
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1 /* DDE client for XEmacs.
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2 Copyright (C) 2002 Alastair J. Houghton
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* -- Includes -------------------------------------------------------------- */
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24
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25 #include <windows.h>
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26 #ifdef HAVE_CONFIG_H
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27 # include <config.h>
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28 #endif
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29 #include <stdlib.h>
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30 #include <stdio.h>
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31 #include <ctype.h>
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32 #include <errno.h>
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33
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34 static void error (const char* s1, const char* s2);
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35 static void fatal (const char *s1, const char *s2);
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36 static void * xmalloc (size_t size);
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37 static char * getNextArg (const char **ptr, unsigned *len);
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38
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39 /* -- Post-Include Defines -------------------------------------------------- */
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40
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41 /* Timeouts & delays */
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42 #define CONNECT_DELAY 500 /* ms */
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43 #define TRANSACTION_TIMEOUT 5000 /* ms */
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44 #define MAX_INPUT_IDLE_WAIT INFINITE /* ms */
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45
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46 /* DDE Strings */
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47 #define SERVICE_NAME "XEmacs"
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48 #define TOPIC_NAME "System"
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49 #define COMMAND_FORMAT "[open(\"%s%s\")]"
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50
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51 /* XEmacs program name */
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52 #define PROGRAM_TO_RUN "xemacs.exe"
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53
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54 /* -- Constants ------------------------------------------------------------- */
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55
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56 /* -- Global Variables ------------------------------------------------------ */
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57
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58 HINSTANCE hInstance;
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59 DWORD idInst = 0;
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60
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61 /* -- Function Declarations ------------------------------------------------- */
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62
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63 HDDEDATA CALLBACK ddeCallback (UINT uType, UINT uFmt, HCONV hconv,
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64 HSZ hsz1, HSZ hsz2, HDDEDATA hdata,
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65 DWORD dwData1, DWORD dwData2);
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66
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67 int WINAPI WinMain (HINSTANCE hInst,
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68 HINSTANCE hPrev,
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69 LPSTR lpCmdLine,
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70 int nCmdShow);
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71
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72 static HCONV openConversation (void);
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73 static void closeConversation (HCONV hConv);
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74 static int doFile (HCONV hConv, LPSTR lpszFileName1, LPSTR lpszFileName2);
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75 static int parseCommandLine (HCONV hConv, LPSTR lpszCommandLine);
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76
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77 /* -- Function Definitions -------------------------------------------------- */
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78
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79 /*
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80 * Name : ddeCallback
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81 * Function: Gets called by DDEML.
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82 *
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83 */
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84
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85 HDDEDATA CALLBACK
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86 ddeCallback (UINT uType, UINT uFmt, HCONV hconv,
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87 HSZ hsz1, HSZ hsz2, HDDEDATA hdata,
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88 DWORD dwData1, DWORD dwData2)
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89 {
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90 return (HDDEDATA) NULL;
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91 }
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92
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93 /*
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94 * Name : WinMain
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95 * Function: The program's entry point function.
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96 *
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97 */
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98
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99 int WINAPI
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100 WinMain (HINSTANCE hInst,
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101 HINSTANCE hPrev,
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102 LPSTR lpCmdLine,
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103 int nCmdShow)
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104 {
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105 HCONV hConv;
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106 int ret = 0;
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107 UINT uiRet;
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108
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109 /* Initialise the DDEML library */
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110 uiRet = DdeInitialize (&idInst,
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111 (PFNCALLBACK) ddeCallback,
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112 APPCMD_CLIENTONLY
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113 |CBF_FAIL_ALLSVRXACTIONS,
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114 0);
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115
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116 if (uiRet != DMLERR_NO_ERROR)
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117 {
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118 MessageBox (NULL, "Could not initialise DDE management library.",
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119 "winclient", MB_ICONEXCLAMATION | MB_OK);
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120
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121 return 1;
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122 }
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123
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124 /* Open a conversation */
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125 hConv = openConversation ();
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126
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127 if (hConv)
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128 {
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129 /* OK. Next, we need to parse the command line. */
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130 ret = parseCommandLine (hConv, lpCmdLine);
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131
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132 /* Close the conversation */
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133 closeConversation (hConv);
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134 }
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135
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136 DdeUninitialize (idInst);
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137
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138 return ret;
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139 }
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140
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141 /*
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142 * Name : openConversation
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143 * Function: Start a conversation.
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144 *
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145 */
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146
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147 static HCONV
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148 openConversation (void)
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149 {
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150 HSZ hszService = NULL, hszTopic = NULL;
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151 HCONV hConv = NULL;
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152
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153 /* Get the application (service) name */
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154 hszService = DdeCreateStringHandle (idInst,
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155 SERVICE_NAME,
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156 CP_WINANSI);
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157
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158 if (!hszService)
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159 {
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160 MessageBox (NULL, "Could not create string handle for service.",
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161 "winclient", MB_ICONEXCLAMATION | MB_OK);
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162
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163 goto error;
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164 }
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165
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166 /* Get the topic name */
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167 hszTopic = DdeCreateStringHandle (idInst,
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168 TOPIC_NAME,
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169 CP_WINANSI);
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170
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171 if (!hszTopic)
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172 {
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173 MessageBox (NULL, "Could not create string handle for topic.",
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174 "winclient", MB_ICONEXCLAMATION | MB_OK);
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175
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176 goto error;
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177 }
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178
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179 /* Try to connect */
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180 hConv = DdeConnect (idInst, hszService, hszTopic, NULL);
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181
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182 if (!hConv)
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183 {
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184 STARTUPINFO sti;
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185 PROCESS_INFORMATION pi;
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186 int n;
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187
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188 /* Try to start the program */
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189 ZeroMemory (&sti, sizeof (sti));
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190 sti.cb = sizeof (sti);
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191 if (!CreateProcess (NULL, PROGRAM_TO_RUN, NULL, NULL, FALSE, 0,
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192 NULL, NULL, &sti, &pi))
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193 {
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194 MessageBox (NULL, "Could not start process.",
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195 "winclient", MB_ICONEXCLAMATION | MB_OK);
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196
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197 goto error;
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198 }
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199
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200 /* Wait for the process to enter an idle state */
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201 WaitForInputIdle (pi.hProcess, MAX_INPUT_IDLE_WAIT);
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202
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203 /* Close the handles */
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204 CloseHandle (pi.hThread);
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205 CloseHandle (pi.hProcess);
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206
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207 /* Try to connect */
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208 for (n = 0; n < 5; n++)
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209 {
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210 Sleep (CONNECT_DELAY);
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211
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212 hConv = DdeConnect (idInst, hszService, hszTopic, NULL);
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213
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214 if (hConv)
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215 break;
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216 }
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217
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218 if (!hConv)
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219 {
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220 /* Still couldn't connect. */
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221 MessageBox (NULL, "Could not connect to DDE server.",
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222 "winclient", MB_ICONEXCLAMATION | MB_OK);
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223
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224 goto error;
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225 }
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226 }
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227
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228 /* Release the string handles */
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229 DdeFreeStringHandle (idInst, hszService);
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230 DdeFreeStringHandle (idInst, hszTopic);
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231
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232 return hConv;
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233
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234 error:
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235 if (hConv)
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236 DdeDisconnect (hConv);
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237 if (hszService)
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238 DdeFreeStringHandle (idInst, hszService);
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239 if (hszTopic)
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240 DdeFreeStringHandle (idInst, hszTopic);
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241
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242 return NULL;
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243 }
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244
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245 /*
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246 * Name : closeConversation
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247 * Function: Close a conversation.
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248 *
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249 */
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250
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251 static void
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252 closeConversation (HCONV hConv)
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253 {
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254 /* Shut down */
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255 DdeDisconnect (hConv);
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256 }
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257
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258 /*
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259 * Name : doFile
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260 * Function: Process a file.
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261 *
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262 */
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263
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264 int
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265 doFile (HCONV hConv, LPSTR lpszFileName1, LPSTR lpszFileName2)
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266 {
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267 char *buf = NULL;
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268 unsigned len;
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269
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270 /* Calculate the buffer length */
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271 len = strlen (lpszFileName1) + strlen (lpszFileName2)
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272 + strlen (COMMAND_FORMAT);
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273
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274 /* Allocate a buffer */
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275 buf = (char *) xmalloc (len);
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276
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277 if (!buf)
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278 {
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279 MessageBox (NULL, "Not enough memory.",
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280 "winclient", MB_ICONEXCLAMATION | MB_OK);
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281
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282 return 1;
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283 }
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284
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285 /* Build the command */
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286 len = wsprintf (buf, COMMAND_FORMAT, lpszFileName1, lpszFileName2);
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287
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288 len++;
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289
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290 /* OK. We're connected. Send the message. */
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291 DdeClientTransaction (buf, len, hConv, NULL,
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292 0, XTYP_EXECUTE, TRANSACTION_TIMEOUT, NULL);
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293
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294 free (buf);
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295
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296 return 0;
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297 }
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298
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299 /*
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300 * Name : getNextArg
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301 * Function: Retrieve the next command line argument.
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302 *
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303 */
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304
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305 static char *
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306 getNextArg (const char **ptr, unsigned *len)
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307 {
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308 int in_quotes = 0, quit = 0, all_in_quotes = 0;
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309 const char *p = *ptr, *start;
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310 char *buf = NULL;
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311 unsigned length = 0;
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312
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313 /* Skip whitespace */
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314 while (*p && isspace (*p))
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315 p++;
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316
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317 /* If this is the end, return NULL */
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318 if (!*p)
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319 return NULL;
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320
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321 /* Remember where we are */
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322 start = p;
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323
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324 /* Find the next whitespace character outside quotes */
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325 if (*p == '"')
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326 all_in_quotes = 1;
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327
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328 while (*p && !quit)
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329 {
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330 switch (*p)
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331 {
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332 case '"':
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333 in_quotes = 1 - in_quotes;
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334 p++;
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335 break;
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336
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337 case '\\':
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338 if (!in_quotes)
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339 all_in_quotes = 0;
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340
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341 p++;
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342
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343 if (!*p)
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344 break;
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345
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346 p++;
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347 break;
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348
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349 default:
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350 if (isspace (*p) && !in_quotes)
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351 quit = 1;
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352 else if (!in_quotes)
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353 all_in_quotes = 0;
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354
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355 if (!quit)
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356 p++;
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357 }
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358 }
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359
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360 /* Work out the length */
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361 length = p - start;
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362
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363 /* Strip quotes if the argument is completely quoted */
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364 if (all_in_quotes)
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365 {
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366 start++;
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367 length -= 2;
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368 }
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369
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370 /* Copy */
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371 buf = (char *) xmalloc (length + 1);
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372
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373 if (!buf)
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374 return NULL;
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375
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376 strncpy (buf, start, length);
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377 buf[length] = '\0';
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378
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379 /* Return the pointer and length */
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380 *ptr = p;
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381 *len = length;
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382
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383 return buf;
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384 }
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385
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386 /*
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387 * Name : parseCommandLine
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388 * Function: Process the command line. This program accepts a list of strings
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389 * : (which may contain wildcards) representing filenames.
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390 *
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391 */
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392
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393 int
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394 parseCommandLine (HCONV hConv, LPSTR lpszCommandLine)
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395 {
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396 char *fullpath, *filepart;
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397 char *arg;
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398 unsigned len, pathlen;
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399 int ret = 0;
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400 HANDLE hFindFile = NULL;
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401 WIN32_FIND_DATA wfd;
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402
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403 /* Retrieve arguments */
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404 while ((arg = getNextArg ((const char**)&lpszCommandLine, &len)) != NULL)
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405 {
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406 /* First find the canonical path name */
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407 fullpath = filepart = NULL;
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408 pathlen = GetFullPathName (arg, 0, fullpath, &filepart);
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409
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410 fullpath = (char *) xmalloc (pathlen);
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411
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412 if (!fullpath)
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413 {
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414 MessageBox (NULL, "Not enough memory.", "winclient",
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415 MB_ICONEXCLAMATION | MB_OK);
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416
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417 ret = 1;
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418 free (arg);
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419
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420 break;
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421 }
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422
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423 GetFullPathName (arg, pathlen, fullpath, &filepart);
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424
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425 /* Find the first matching file */
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426 hFindFile = FindFirstFile (arg, &wfd);
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427
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428 if (hFindFile == INVALID_HANDLE_VALUE)
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429 ret = doFile (hConv, fullpath, "");
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430 else
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431 {
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432 /* Chop off the file part from the full path name */
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433 if (filepart)
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434 *filepart = '\0';
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435
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436 /* For each matching file */
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437 do
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438 {
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439 /* Process it */
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440 ret = doFile (hConv, fullpath, wfd.cFileName);
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441
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442 if (ret)
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443 break;
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444 }
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445 while (FindNextFile (hFindFile, &wfd));
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446
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447 FindClose (hFindFile);
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448 }
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449
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450 /* Release the path name buffers */
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451 free (fullpath);
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452 free (arg);
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453
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454 if (ret)
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455 break;
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456 }
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457
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458 return ret;
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459 }
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460
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461 static void
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462 fatal (const char *s1, const char *s2)
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463 {
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464 error (s1, s2);
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465 exit (1);
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466 }
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467
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468 /* Print error message. `s1' is printf control string, `s2' is arg for it. */
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469 static void
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470 error (const char* s1, const char* s2)
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471 {
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472 fprintf (stderr, "winclient: ");
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473 fprintf (stderr, s1, s2);
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474 fprintf (stderr, "\n");
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475 }
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476
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477 /* Like malloc but get fatal error if memory is exhausted. */
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478
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479 static void *
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480 xmalloc (size_t size)
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481 {
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482 void *result = malloc (size);
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483 if (result == NULL)
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484 fatal ("virtual memory exhausted", (char *) 0);
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485 return result;
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486 }
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