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