From 1f4b96ff118c4666bb2674edb09c7dfcfa45f61d Mon Sep 17 00:00:00 2001
From: ian <ian>
Date: Sun, 22 Jan 2006 15:59:47 +0000
Subject: [PATCH] slight improvements to scriptinv, including
 scriptinv_invoke_fg

---
 base/chiark-tcl.h |  7 ++++++-
 base/scriptinv.c  | 10 ++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/base/chiark-tcl.h b/base/chiark-tcl.h
index 4c022cb..f3f0922 100644
--- a/base/chiark-tcl.h
+++ b/base/chiark-tcl.h
@@ -39,7 +39,7 @@ typedef struct { /* semi-opaque - read only, and then only where commented */
   Tcl_Interp *ip; /* valid, non-0 and useable if set */
   Tcl_Obj *obj; /* non-0 iff set (but only test for 0/non-0) */
   Tcl_Obj *xargs;
-  int llength;
+  int llength; /* after set, is llength of script + xargs */
 } ScriptToInvoke;
 
 void cht_scriptinv_init(ScriptToInvoke *si);
@@ -48,7 +48,12 @@ int cht_scriptinv_set(ScriptToInvoke *si, Tcl_Interp *ip,
 void cht_scriptinv_cancel(ScriptToInvoke *si); /* then don't invoke */
   /* no separate free function - just cancel */
 
+int cht_scriptinv_invoke_fg(ScriptToInvoke *si, int argc,
+			    Tcl_Obj *const *argv);
+  /* if script fails, returns that error */
+
 void cht_scriptinv_invoke(ScriptToInvoke *si, int argc, Tcl_Obj *const *argv);
+  /* if script fails, reports it with Tcl_BackgroundError */
 
 /* from idtable.c */
 
diff --git a/base/scriptinv.c b/base/scriptinv.c
index 3bc383d..6dd5375 100644
--- a/base/scriptinv.c
+++ b/base/scriptinv.c
@@ -34,7 +34,8 @@ int cht_scriptinv_set(ScriptToInvoke *si, Tcl_Interp *ip,
   return 0;
 }  
   
-void cht_scriptinv_invoke(ScriptToInvoke *si, int argc, Tcl_Obj *const *argv) {
+int cht_scriptinv_invoke_fg(ScriptToInvoke *si, int argc,
+			    Tcl_Obj *const *argv) {
   Tcl_Obj *invoke=0;
   int i, rc;
 
@@ -60,5 +61,10 @@ void cht_scriptinv_invoke(ScriptToInvoke *si, int argc, Tcl_Obj *const *argv) {
 x_rc:
   for (i=0; i<argc; i++) Tcl_DecrRefCount(argv[i]);
   if (invoke) Tcl_DecrRefCount(invoke);
-  if (rc) Tcl_BackgroundError(si->ip);
+  return rc;
 }
+
+void cht_scriptinv_invoke(ScriptToInvoke *si, int argc, Tcl_Obj *const *argv) {
+  rc= cht_scriptinv_invoke_fg(si, argc, argv);
+  if (rc) Tcl_BackgroundError(si->ip);
+}  
-- 
2.30.2