Use proper file sharing parameters when opening files.

programs/wcmd/batch.c

@@ -54,7 +54,8 @@ BATCH_CONTEXT *prev_context;
   strcpy (string, file);
   CharLower (string);
   if (strstr (string, ".bat") == NULL) strcat (string, ".bat");
-  h = CreateFile (string, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+  h = CreateFile (string, GENERIC_READ, FILE_SHARE_READ,
+                  NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
   if (h == INVALID_HANDLE_VALUE) {
     SetLastError (ERROR_FILE_NOT_FOUND);
     WCMD_print_error ();

programs/wcmd/builtins.c

@@ -389,25 +389,28 @@ char condition[MAX_PATH], *command, *s;
   if (!lstrcmpi (condition, "errorlevel")) {
     if (errorlevel >= atoi(WCMD_parameter (p, 1+negate, NULL))) test = 1;
     return;
+    WCMD_parameter (p, 2+negate, &command);
   }
   else if (!lstrcmpi (condition, "exist")) {
-    if ((h = CreateFile (WCMD_parameter (p, 1+negate, NULL), GENERIC_READ, 0, NULL,
+    if ((h = CreateFile (WCMD_parameter (p, 1+negate, NULL), GENERIC_READ,
+                         FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
 	OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL)) != INVALID_HANDLE_VALUE) {
       CloseHandle (h);
       test = 1;
     }
+    WCMD_parameter (p, 2+negate, &command);
   }
   else if ((s = strstr (p, "=="))) {
     s += 2;
     if (!lstrcmpi (condition, WCMD_parameter (s, 0, NULL))) test = 1;
+    WCMD_parameter (s, 1, &command);
   }
   else {
     WCMD_output ("Syntax error\n");
     return;
   }
   if (test != negate) {
-    WCMD_parameter (p, 2+negate, &s);
-    command = strdup (s);
+    command = strdup (command);
     WCMD_process_command (command);
     free (command);
   }

programs/wcmd/wcmdmain.c

@@ -106,7 +106,7 @@ HANDLE h;
  */
 
   GetFullPathName ("\\autoexec.bat", sizeof(string), string, NULL);
-  h = CreateFile (string, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+  h = CreateFile (string, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
   if (h != INVALID_HANDLE_VALUE) {
     CloseHandle (h);
 #if 0
@@ -181,7 +181,7 @@ char *whichcmd;
  */
 
     if ((p = strchr(cmd,'<')) != NULL) {
-      h = CreateFile (WCMD_parameter (++p, 0, NULL), GENERIC_READ, 0, NULL, OPEN_EXISTING,
+      h = CreateFile (WCMD_parameter (++p, 0, NULL), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
 		FILE_ATTRIBUTE_NORMAL, NULL);
       if (h == INVALID_HANDLE_VALUE) {
 	WCMD_print_error ();
@@ -383,7 +383,8 @@ char filetorun[MAX_PATH];
     if (strchr (param1, '.') == NULL) {
       strcpy (filetorun, param1);
       strcat (filetorun, ".bat");
-      h = CreateFile (filetorun, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+      h = CreateFile (filetorun, GENERIC_READ, FILE_SHARE_READ,
+                      NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
       if (h != INVALID_HANDLE_VALUE) {
         CloseHandle (h);
         WCMD_batch (param1, command, 0);