programs/start/start.c

   1 /*
   2  * Start a program using ShellExecuteEx, optionally wait for it to finish
   3  * Compatible with Microsoft's "c:\windows\command\start.exe"
   4  *
   5  * Copyright 2003 Dan Kegel
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <windows.h>
  23 #include <winuser.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <shlobj.h>
  27
  28 #include "resources.h"
  29
  30 /**
  31  Output given message to stdout without formatting.
  32 */
  33 static void output(const char *message)
  34 {
  35         DWORD count;
  36         WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), message, strlen(message), &count, NULL);
  37 }
  38
  39 /**
  40  Output given message,
  41  followed by ": ",
  42  followed by description of given GetLastError() value to stdout,
  43  followed by a trailing newline,
  44  then terminate.
  45 */
  46 static void fatal_error(const char *msg, DWORD error_code)
  47 {
  48         LPVOID lpMsgBuf;
  49         int status;
  50
  51         output(msg);
  52         output(": ");
  53         status = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error_code, 0, (LPTSTR) & lpMsgBuf, 0, NULL);
  54         if (!status) {
  55                 output("FormatMessage failed\n");
  56         } else {
  57                 output(lpMsgBuf);
  58                 LocalFree((HLOCAL) lpMsgBuf);
  59                 output("\n");
  60         }
  61         ExitProcess(1);
  62 }
  63
  64 /**
  65  Output given message from string table,
  66  followed by ": ",
  67  followed by description of given GetLastError() value to stdout,
  68  followed by a trailing newline,
  69  then terminate.
  70 */
  71 static void fatal_string_error(int which, DWORD error_code)
  72 {
  73         char msg[2048];
  74
  75         if (!LoadString(GetModuleHandle(NULL), which,
  76                                         msg, sizeof(msg)))
  77                 fatal_error("LoadString failed", GetLastError());
  78
  79         fatal_error(msg, error_code);
  80 }
  81
  82 static void fatal_string(int which)
  83 {
  84         char msg[2048];
  85
  86         if (!LoadString(GetModuleHandle(NULL), which,
  87                                         msg, sizeof(msg)))
  88                 fatal_error("LoadString failed", GetLastError());
  89
  90         output(msg);
  91         ExitProcess(1);
  92 }
  93
  94 static void usage(void)
  95 {
  96         fatal_string(STRING_USAGE);
  97 }
  98
  99 static void license(void)
 100 {
 101         fatal_string(STRING_LICENSE);
 102 }
 103
 104 static char *build_args( int argc, char **argv )
 105 {
 106         int i, len = 1;
 107         char *ret, *p;
 108
 109         for (i = 0; i < argc; i++ )
 110                 len += strlen(argv[i]) + 1;
 111         ret = HeapAlloc( GetProcessHeap(), 0, len );
 112         ret[0] = 0;
 113
 114         for (i = 0, p = ret; i < argc; i++ )
 115                 p += sprintf(p, " %s", argv[i]);
 116         return ret;
 117 }
 118
 119 int main(int argc, char *argv[])
 120 {
 121         SHELLEXECUTEINFO sei;
 122         char *args;
 123         int i;
 124
 125         memset(&sei, 0, sizeof(sei));
 126         sei.cbSize = sizeof(sei);
 127         sei.lpVerb = "open";
 128         sei.nShow = SW_SHOWNORMAL;
 129         /* Dunno what these mean, but it looks like winMe's start uses them */
 130         sei.fMask = SEE_MASK_FLAG_DDEWAIT|SEE_MASK_FLAG_NO_UI;
 131
 132         /* Canonical Microsoft commandline flag processing:
 133          * flags start with /, are case insensitive,
 134          * and may be run together in same word.
 135          */
 136         for (i=1; i<argc; i++) {
 137                 int ci;
 138
 139                 if (argv[i][0] != '/')
 140                         break;
 141
 142                 /* Handle all options in this word */
 143                 for (ci=0; argv[i][ci]; ) {
 144                         /* Skip slash */
 145                         ci++;
 146                         switch(argv[i][ci]) {
 147                         case 'l':
 148                         case 'L':
 149                                 license();
 150                                 break;  /* notreached */
 151                         case 'm':
 152                         case 'M':
 153                                 if (argv[i][ci+1] == 'a' || argv[i][ci+1] == 'A')
 154                                         sei.nShow = SW_SHOWMAXIMIZED;
 155                                 else
 156                                         sei.nShow = SW_SHOWMINIMIZED;
 157                                 break;
 158                         case 'r':
 159                         case 'R':
 160                                 /* sei.nShow = SW_SHOWNORMAL; */
 161                                 break;
 162                         case 'w':
 163                         case 'W':
 164                                 sei.fMask |= SEE_MASK_NOCLOSEPROCESS;
 165                                 break;
 166                         default:
 167                                 printf("Option '%s' not recognized\n", argv[i]+ci-1);
 168                                 usage();
 169                         }
 170                         /* Skip to next slash */
 171                         while (argv[i][ci] && (argv[i][ci] != '/'))
 172                                 ci++;
 173                 }
 174         }
 175
 176         if (i == argc)
 177                 usage();
 178
 179         sei.lpFile = argv[i++];
 180
 181         args = build_args( argc - i, &argv[i] );
 182         sei.lpParameters = args;
 183
 184         if (!ShellExecuteEx(&sei))
 185                 fatal_string_error(STRING_EXECFAIL, GetLastError());
 186
 187         HeapFree( GetProcessHeap(), 0, args );
 188
 189         if (sei.fMask & SEE_MASK_NOCLOSEPROCESS) {
 190                 DWORD exitcode;
 191                 DWORD waitcode;
 192                 waitcode = WaitForSingleObject(sei.hProcess, INFINITE);
 193                 if (waitcode)
 194                         fatal_error("WaitForSingleObject", GetLastError());
 195                 if (!GetExitCodeProcess(sei.hProcess, &exitcode))
 196                         fatal_error("GetExitCodeProcess", GetLastError());
 197                 /* fixme: haven't tested whether exit code works properly */
 198                 ExitProcess(exitcode);
 199         }
 200
 201         ExitProcess(0);
 202 }