From cf79867094e8877f35639d50769d2fe9c2a8bd0b Mon Sep 17 00:00:00 2001
From: ian <ian>
Date: Wed, 11 Sep 2002 01:58:36 +0000
Subject: [PATCH] does modexps, makes signatures, needs sane hexstring handling

---
 base/chiark-tcl.h        |  1 +
 base/hook.c              | 12 ++++++++++++
 base/tables-examples.tct |  2 ++
 hbytes/hbytes.h          |  1 +
 hbytes/hook.c            | 12 ++++++++++++
 5 files changed, 28 insertions(+)

diff --git a/base/chiark-tcl.h b/base/chiark-tcl.h
index 23cad20..f482cc5 100644
--- a/base/chiark-tcl.h
+++ b/base/chiark-tcl.h
@@ -15,6 +15,7 @@
  *
  *  hbytes range VALUE START SIZE                => substring (or error)
  *  hbytes overwrite VAR START VALUE
+ *  hbytes trimleft VALUE                        removes any leading 0 octets
  *  hbytes repeat VALUE COUNT                    => COUNT copies of VALUE
  *
  *  hbytes h2ulong HEX                           => ulong  (HEX len must be 4)
diff --git a/base/hook.c b/base/hook.c
index f364978..0adb6b5 100644
--- a/base/hook.c
+++ b/base/hook.c
@@ -210,6 +210,18 @@ int do_hbytes_overwrite(ClientData cd, Tcl_Interp *ip,
   return TCL_OK;
 }
 
+int do_hbytes_trimleft(ClientData cd, Tcl_Interp *ip, HBytes_Var v) {
+  const Byte *o, *p, *e;
+  o= p= hbytes_data(v.hb);
+  e= p + hbytes_len(v.hb);
+
+  while (p<e && !*p) p++;
+  if (p != o)
+    hbytes_unprepend(v.hb, p-o);
+
+  return TCL_OK;
+}
+
 int do_hbytes_repeat(ClientData cd, Tcl_Interp *ip,
 		     HBytes_Value sub, int count, HBytes_Value *result) {
   int sub_l;
diff --git a/base/tables-examples.tct b/base/tables-examples.tct
index f2146a5..d2e0038 100644
--- a/base/tables-examples.tct
+++ b/base/tables-examples.tct
@@ -112,6 +112,8 @@ Table hbytes HBytes_SubCommand
 		v	hbv
 		start	int
 		sub	hb
+	trimleft
+		v	hbv
 	zeroes
 		length	int
 		=>	hb
diff --git a/hbytes/hbytes.h b/hbytes/hbytes.h
index 23cad20..f482cc5 100644
--- a/hbytes/hbytes.h
+++ b/hbytes/hbytes.h
@@ -15,6 +15,7 @@
  *
  *  hbytes range VALUE START SIZE                => substring (or error)
  *  hbytes overwrite VAR START VALUE
+ *  hbytes trimleft VALUE                        removes any leading 0 octets
  *  hbytes repeat VALUE COUNT                    => COUNT copies of VALUE
  *
  *  hbytes h2ulong HEX                           => ulong  (HEX len must be 4)
diff --git a/hbytes/hook.c b/hbytes/hook.c
index f364978..0adb6b5 100644
--- a/hbytes/hook.c
+++ b/hbytes/hook.c
@@ -210,6 +210,18 @@ int do_hbytes_overwrite(ClientData cd, Tcl_Interp *ip,
   return TCL_OK;
 }
 
+int do_hbytes_trimleft(ClientData cd, Tcl_Interp *ip, HBytes_Var v) {
+  const Byte *o, *p, *e;
+  o= p= hbytes_data(v.hb);
+  e= p + hbytes_len(v.hb);
+
+  while (p<e && !*p) p++;
+  if (p != o)
+    hbytes_unprepend(v.hb, p-o);
+
+  return TCL_OK;
+}
+
 int do_hbytes_repeat(ClientData cd, Tcl_Interp *ip,
 		     HBytes_Value sub, int count, HBytes_Value *result) {
   int sub_l;
-- 
2.30.2