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113 lines
3.7 KiB
113 lines
3.7 KiB
14 years ago
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/*
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* w9xpopen.c
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*
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* Serves as an intermediate stub Win32 console application to
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* avoid a hanging pipe when redirecting 16-bit console based
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* programs (including MS-DOS console based programs and batch
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* files) on Window 95 and Windows 98.
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*
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* This program is to be launched with redirected standard
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* handles. It will launch the command line specified 16-bit
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* console based application in the same console, forwarding
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* it's own redirected standard handles to the 16-bit child.
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* AKA solution to the problem described in KB: Q150956.
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*/
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h> /* for malloc and its friends */
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const char *usage =
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"This program is used by Python's os.popen function\n"
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"to work around a limitation in Windows 95/98. It is\n"
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"not designed to be used as a stand-alone program.";
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int main(int argc, char *argv[])
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{
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BOOL bRet;
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STARTUPINFO si;
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PROCESS_INFORMATION pi;
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DWORD exit_code=0;
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int cmdlen = 0;
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int i;
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char *cmdline, *cmdlinefill;
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if (argc < 2) {
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if (GetFileType(GetStdHandle(STD_INPUT_HANDLE))==FILE_TYPE_CHAR)
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/* Attached to a console, and therefore not executed by Python
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Display a message box for the inquisitive user
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*/
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MessageBox(NULL, usage, argv[0], MB_OK);
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else {
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/* Eeek - executed by Python, but args are screwed!
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Write an error message to stdout so there is at
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least some clue for the end user when it appears
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in their output.
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A message box would be hidden and blocks the app.
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*/
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fprintf(stdout, "Internal popen error - no args specified\n%s\n", usage);
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}
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return 1;
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}
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/* Build up the command-line from the args.
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Args with a space are quoted, existing quotes are escaped.
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To keep things simple calculating the buffer size, we assume
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every character is a quote - ie, we allocate double what we need
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in the worst case. As this is only double the command line passed
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to us, there is a good chance this is reasonably small, so the total
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allocation will almost always be < 512 bytes.
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*/
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for (i=1;i<argc;i++)
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cmdlen += strlen(argv[i])*2 + 3; /* one space, maybe 2 quotes */
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cmdline = cmdlinefill = (char *)malloc(cmdlen+1);
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if (cmdline == NULL)
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return -1;
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for (i=1;i<argc;i++) {
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const char *arglook;
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int bQuote = strchr(argv[i], ' ') != NULL;
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if (bQuote)
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*cmdlinefill++ = '"';
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/* escape quotes */
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for (arglook=argv[i];*arglook;arglook++) {
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if (*arglook=='"')
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*cmdlinefill++ = '\\';
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*cmdlinefill++ = *arglook;
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}
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if (bQuote)
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*cmdlinefill++ = '"';
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*cmdlinefill++ = ' ';
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}
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*cmdlinefill = '\0';
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/* Make child process use this app's standard files. */
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ZeroMemory(&si, sizeof si);
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si.cb = sizeof si;
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si.dwFlags = STARTF_USESTDHANDLES;
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si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
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si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
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bRet = CreateProcess(
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NULL, cmdline,
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NULL, NULL,
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TRUE, 0,
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NULL, NULL,
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&si, &pi
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);
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free(cmdline);
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if (bRet) {
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if (WaitForSingleObject(pi.hProcess, INFINITE) != WAIT_FAILED) {
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GetExitCodeProcess(pi.hProcess, &exit_code);
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}
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CloseHandle(pi.hProcess);
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CloseHandle(pi.hThread);
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return exit_code;
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}
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return 1;
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}
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