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#define Unknown win_Unknown
#define UNICODE
#include <windows.h>
#include <winbase.h>
#include <winsock.h>
#undef Unknown
#include "dat.h"
#include "fns.h"
#include "error.h"
extern int nth2fd(HANDLE);
extern wchar_t *widen(char*);
/*
* thanks to rcsh for these.
*
* windows quoting rules - I think
* Words are separated by space or tab
* Words containing a space or tab can be quoted using "
* 2N backslashes + " ==> N backslashes and end quote
* 2N+1 backslashes + " ==> N backslashes + literal "
* N backslashes not followed by " ==> N backslashes
*/
static char *
dblquote(char *cmd, char *s)
{
int nb;
char *p;
for(p=s; *p; p++)
if(*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r' || *p == '"')
break;
if(*p == 0){ /* easy case */
strcpy(cmd, s);
return cmd+(p-s);
}
*cmd++ = '"';
for(;;) {
for(nb=0; *s=='\\'; nb++)
*cmd++ = *s++;
if(*s == 0) { /* trailing backslashes -> 2N */
while(nb-- > 0)
*cmd++ = '\\';
break;
}
if(*s == '"') { /* literal quote -> 2N+1 backslashes */
while(nb-- > 0)
*cmd++ = '\\';
*cmd++ = '\\'; /* escape the quote */
}
*cmd++ = *s++;
}
*cmd++ = '"';
*cmd = 0;
return cmd;
}
static char *
ntquotedcmd(char **argv)
{
int i, n;
char *cmd, *p;
/* conservatively calculate length of command;
* backslash expansion can cause growth in dblquote().
*/
for(i=0,n=0; argv[i]; i++)
n += 2*strlen(argv[i]);
n++;
cmd = malloc(n);
if(cmd == nil)
return nil;
for(i=0,p=cmd; argv[i]; i++) {
p = dblquote(p, argv[i]);
*p++ = ' ';
}
if(p != cmd)
p--;
*p = 0;
return cmd;
}
static HANDLE
exporthandle(HANDLE h, int close)
{
HANDLE cp, dh;
DWORD flags = DUPLICATE_SAME_ACCESS;
if (close)
flags |= DUPLICATE_CLOSE_SOURCE;
cp = GetCurrentProcess();
if (!DuplicateHandle(cp, h, cp, &dh, DUPLICATE_SAME_ACCESS, 1, flags))
return nil;
return dh;
}
/* TO DO: check that oserrstr will have the right text on error */
void*
oscmd(char **args, int nice, char *dir, int *fd)
{
STARTUPINFO si;
SECURITY_ATTRIBUTES sec;
HANDLE rh, wh, eh, srh, swh, seh;
PROCESS_INFORMATION pinfo;
char *cmd;
wchar_t *wcmd, *wdir;
int prio;
wdir = nil;
if(dir != nil)
wdir = widen(dir);
cmd = ntquotedcmd(args);
if(cmd == nil)
error(Enomem);
wcmd = widen(cmd);
sec.nLength = sizeof(sec);
sec.lpSecurityDescriptor = 0;
sec.bInheritHandle = 0;
rh = wh = eh = srh = swh = seh = nil;
if(!CreatePipe(&rh, &swh, &sec, 0))
goto Error;
if(!CreatePipe(&srh, &wh, &sec, 0))
goto Error;
if(!CreatePipe(&seh, &eh, &sec, 0))
goto Error;
rh = exporthandle(rh, 1);
if(rh == nil)
goto Error;
wh = exporthandle(wh, 1);
if(wh == nil)
goto Error;
eh = exporthandle(eh, 1);
if(eh == nil)
goto Error;
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
si.dwFlags = STARTF_USESHOWWINDOW|STARTF_USESTDHANDLES;
si.wShowWindow = SW_SHOW;
si.hStdInput = rh;
si.hStdOutput = wh;
si.hStdError = eh;
prio = 0;
if(nice){
prio = IDLE_PRIORITY_CLASS;
if(nice > 1)
prio |= CREATE_SUSPENDED;
}
/* default of nil for wpath seems to be what we want; nil for env exports our current one */
if(!CreateProcess(nil/*wpath*/, wcmd, 0, 0, 1,
CREATE_NEW_PROCESS_GROUP|CREATE_DEFAULT_ERROR_MODE|prio,
0 /*env*/, wdir, &si, &pinfo)){
//print("can't create process '%Q' %d\n", wcmd, GetLastError());
goto Error;
}
fd[0] = nth2fd(swh);
fd[1] = nth2fd(srh);
fd[2] = nth2fd(seh);
if(fd[1] == 1 || fd[2] == 2)
panic("invalid mapping of handle to fd");
CloseHandle(si.hStdInput);
CloseHandle(si.hStdOutput);
CloseHandle(si.hStdError);
if(prio & CREATE_SUSPENDED){
if(nice > 1)
SetThreadPriority(pinfo.hThread,
nice>3? THREAD_PRIORITY_IDLE:
nice>2? THREAD_PRIORITY_LOWEST:
THREAD_PRIORITY_BELOW_NORMAL);
ResumeThread(pinfo.hThread);
}
CloseHandle(pinfo.hThread);
/* don't close process handle */
free(cmd);
free(wcmd);
free(wdir);
return pinfo.hProcess;
Error:
if(rh)
CloseHandle(rh);
if(wh)
CloseHandle(wh);
if(eh)
CloseHandle(eh);
if(srh)
CloseHandle(srh);
if(swh)
CloseHandle(swh);
if(seh)
CloseHandle(seh);
free(cmd);
free(wcmd);
free(wdir);
return nil;
}
int
oscmdwait(void *v, char *buf, int n)
{
int status;
HANDLE proc = (HANDLE)v;
/* need not worry about being interrupted */
if(WaitForSingleObject(proc, INFINITE) == WAIT_FAILED)
return -1;
if(!GetExitCodeProcess(proc, &status))
status = 1;
if(status)
n = snprint(buf, n, "0 0 0 0 'status %d'", status);
else
n = snprint(buf, n, "0 0 0 0 ''");
return n;
}
int
oscmdkill(void *v)
{
if(TerminateProcess((HANDLE)v, 666) == FALSE)
return -1;
return 0;
}
void
oscmdfree(void *v)
{
CloseHandle((HANDLE)v);
}
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