msvcrt-B06: _system

[Jaco Greeff <jaco@puxedo.org>]

Fixed the FIXME in process.c/system to allow for system calls to be 
xecuted via the COMSPEC interpreter

License:
LGPL

Changelog:
* dlls/msvcrt/process.c: Jaco Greeff <jaco@puxedo.org>
- Updated the system call to launch system commands via COMSPEC
diff -aurN msvcrt-B05/dlls/msvcrt/process.c msvcrt-B06/dlls/msvcrt/process.c
--- msvcrt-B05/dlls/msvcrt/process.c	Fri Oct  4 02:27:10 2002
+++ msvcrt-B06/dlls/msvcrt/process.c	Tue Nov  5 13:04:49 2002
@@ -1,10 +1,11 @@
-/*
+    /*
  * msvcrt.dll spawn/exec functions
  *
  * Copyright 1996,1998 Marcus Meissner
  * Copyright 1996 Jukka Iivonen
  * Copyright 1997,2000 Uwe Bonnes
  * Copyright 2000 Jon Griffiths
+ * Copyright 2002 Jaco Greeff
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -28,6 +29,7 @@
 #include "config.h"
 
 #include <stdarg.h>
+#include <stdio.h>
 
 #include "msvcrt.h"
 #include "msvcrt/errno.h"
@@ -437,12 +439,34 @@
  */
 int MSVCRT_system(const char* cmd)
 {
+    static const char szExec[] = " /c ";
+    char szComspec[1024+1];
     char* cmdcopy;
     int res;
 
-    /* Make a writable copy for CreateProcess */
-    cmdcopy=_strdup(cmd);
-    /* FIXME: should probably launch cmd interpreter in COMSPEC */
+    TRACE("(cmd == %s)\n", cmd);
+
+    /* Get the value of COMSPEC which should point to our
+     * default command interpreter. If the interpreter is
+     * not available, fail.
+     */
+    if (!GetEnvironmentVariableA("COMSPEC", szComspec, 1024))
+    {
+        TRACE("COMSPEC not available, _system call fails\n");
+        return -1;
+    }
+
+    /* Allocate enough memory to hold the interpreter + command
+     * string and set it. When using the command interpreter in
+     * this way, it is executed as "comspec /c command"
+     */
+    if (!(cmdcopy = (char *)MSVCRT_malloc(strlen(szComspec)+strlen(szExec)+strlen(cmd)+1)))
+    {
+        TRACE("Unable to allocate memory for _system call\n");
+        return -1;
+    }
+    sprintf(cmdcopy, "%s%s%s", szComspec, szExec, cmd);
+
     res=msvcrt_spawn(_P_WAIT, NULL, cmdcopy, NULL);
     MSVCRT_free(cmdcopy);
     return res;