Sweden-Number/programs/start/start.c

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/*
* Start a program using ShellExecuteEx, optionally wait for it to finish
* Compatible with Microsoft's "c:\windows\command\start.exe"
*
* Copyright 2003 Dan Kegel
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <windows.h>
#include <winuser.h>
#include <stdio.h>
#include <stdlib.h>
#include <shlobj.h>
#include "resources.h"
/**
Output given message to stdout without formatting.
*/
static void output(const char *message)
{
DWORD count;
WriteFile(GetStdHandle(STD_OUTPUT_HANDLE), message, strlen(message), &count, NULL);
}
/**
Output given message,
followed by ": ",
followed by description of given GetLastError() value to stdout,
followed by a trailing newline,
then terminate.
*/
static void fatal_error(const char *msg, DWORD error_code)
{
LPVOID lpMsgBuf;
int status;
output(msg);
output(": ");
status = FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, error_code, 0, (LPTSTR) & lpMsgBuf, 0, NULL);
if (!status) {
output("FormatMessage failed\n");
} else {
output(lpMsgBuf);
LocalFree((HLOCAL) lpMsgBuf);
output("\n");
}
ExitProcess(1);
}
/**
Output given message from string table,
followed by ": ",
followed by description of given GetLastError() value to stdout,
followed by a trailing newline,
then terminate.
*/
static void fatal_string_error(int which, DWORD error_code)
{
char msg[2048];
if (!LoadString(GetModuleHandle(NULL), which,
msg, sizeof(msg)))
fatal_error("LoadString failed", GetLastError());
fatal_error(msg, error_code);
}
static void fatal_string(int which)
{
char msg[2048];
if (!LoadString(GetModuleHandle(NULL), which,
msg, sizeof(msg)))
fatal_error("LoadString failed", GetLastError());
output(msg);
ExitProcess(1);
}
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static void usage(void)
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{
fatal_string(STRING_USAGE);
}
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static void license(void)
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{
fatal_string(STRING_LICENSE);
}
static char *build_args( int argc, char **argv )
{
int i, len = 1;
char *ret, *p;
for (i = 0; i < argc; i++ )
len += strlen(argv[i]) + 1;
ret = HeapAlloc( GetProcessHeap(), 0, len );
for (i = 0, p = ret; i < argc; i++ )
p += sprintf(p, " %s", argv[i]);
return ret;
}
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int main(int argc, char *argv[])
{
SHELLEXECUTEINFO sei;
char *args;
int i;
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memset(&sei, 0, sizeof(sei));
sei.cbSize = sizeof(sei);
sei.lpVerb = "open";
sei.nShow = SW_SHOWNORMAL;
/* Dunno what these mean, but it looks like winMe's start uses them */
sei.fMask = SEE_MASK_FLAG_DDEWAIT|SEE_MASK_FLAG_NO_UI;
/* Canonical Microsoft commandline flag processing:
* flags start with /, are case insensitive,
* and may be run together in same word.
*/
for (i=1; i<argc; i++) {
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int ci;
if (argv[i][0] != '/')
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break;
/* Handle all options in this word */
for (ci=0; argv[i][ci]; ) {
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/* Skip slash */
ci++;
switch(argv[i][ci]) {
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case 'l':
case 'L':
license();
break; /* notreached */
case 'm':
case 'M':
if (argv[i][ci+1] == 'a' || argv[i][ci+1] == 'A')
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sei.nShow = SW_SHOWMAXIMIZED;
else
sei.nShow = SW_SHOWMINIMIZED;
break;
case 'r':
case 'R':
/* sei.nShow = SW_SHOWNORMAL; */
break;
case 'w':
case 'W':
sei.fMask |= SEE_MASK_NOCLOSEPROCESS;
break;
default:
printf("Option '%s' not recognized\n", argv[i]+ci-1);
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usage();
}
/* Skip to next slash */
while (argv[i][ci] && (argv[i][ci] != '/'))
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ci++;
}
}
if (i == argc)
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usage();
sei.lpFile = argv[i++];
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args = build_args( argc - i, &argv[i] );
sei.lpParameters = args;
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if (!ShellExecuteEx(&sei))
fatal_string_error(STRING_EXECFAIL, GetLastError());
HeapFree( GetProcessHeap(), 0, args );
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if (sei.fMask & SEE_MASK_NOCLOSEPROCESS) {
DWORD exitcode;
DWORD waitcode;
waitcode = WaitForSingleObject(sei.hProcess, INFINITE);
if (waitcode)
fatal_error("WaitForSingleObject", GetLastError());
if (!GetExitCodeProcess(sei.hProcess, &exitcode))
fatal_error("GetExitCodeProcess", GetLastError());
/* fixme: haven't tested whether exit code works properly */
ExitProcess(exitcode);
}
ExitProcess(0);
}