X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=chiark-tcl.git;a=blobdiff_plain;f=hbytes%2Fhook.c;h=937295842b8045c3b765e45084f7a32c2d0ac058;hp=cdcb246d2c742b945ad8444faad1cd1705529b01;hb=f9ddca2f19d966e0d64d5bc6de023dbc3764552c;hpb=5d466de467f28ae6f7125bef086d141a7734a4ce

diff --git a/hbytes/hook.c b/hbytes/hook.c
index cdcb246..9372958 100644
--- a/hbytes/hook.c
+++ b/hbytes/hook.c
@@ -6,8 +6,9 @@
 #include "hbytes.h"
 #include "tables.h"
 
-int staticerr(Tcl_Interp *ip, const char *m) {
+int staticerr(Tcl_Interp *ip, const char *m, const char *ec) {
   Tcl_SetResult(ip, (char*)m, TCL_STATIC);
+  if (ec) Tcl_SetObjErrorCode(ip, Tcl_NewStringObj(ec,-1));
   return TCL_ERROR;
 }
 
@@ -134,25 +135,35 @@ static int hbytes_t_sfa(Tcl_Interp *ip, Tcl_Obj *o) {
   int l;
   char cbuf[3];
 
-  os= str= Tcl_GetStringFromObj(o,&l);  assert(str);
-  objfreeir(o);
+  if (o->typePtr == &ulong_type) {
+    uint32_t ul;
 
-  if (l & 1) return staticerr(ip, "hbytes: conversion from hex:"
-			      " odd length in hex");
+    ul= htonl(*(const uint32_t*)&o->internalRep.longValue);
+    hbytes_array(OBJ_HBYTES(o), (const Byte*)&ul, 4);
 
-  startbytes= bytes= hbytes_arrayspace(OBJ_HBYTES(o), l/2);
-
-  cbuf[2]= 0;
-  while (l>0) {
-    cbuf[0]= *str++;
-    cbuf[1]= *str++;
-    *bytes++= strtoul(cbuf,&ep,16);
-    if (ep != cbuf+2) {
-      hbytes_free(OBJ_HBYTES(o));
-      return staticerr(ip, "hbytes: conversion from hex:"
-		       " bad hex digit");
+  } else {
+  
+    os= str= Tcl_GetStringFromObj(o,&l);  assert(str);
+    objfreeir(o);
+
+    if (l & 1) return staticerr(ip, "hbytes: conversion from hex:"
+				" odd length in hex", "HBYTES SYNTAX");
+
+    startbytes= bytes= hbytes_arrayspace(OBJ_HBYTES(o), l/2);
+
+    cbuf[2]= 0;
+    while (l>0) {
+      cbuf[0]= *str++;
+      cbuf[1]= *str++;
+      *bytes++= strtoul(cbuf,&ep,16);
+      if (ep != cbuf+2) {
+	hbytes_free(OBJ_HBYTES(o));
+	return staticerr(ip, "hbytes: conversion from hex:"
+			 " bad hex digit", "HBYTES SYNTAX");
+      }
+      l -= 2;
     }
-    l -= 2;
+
   }
 
   o->typePtr = &hbytes_type;
@@ -203,9 +214,11 @@ int do_hbytes_overwrite(ClientData cd, Tcl_Interp *ip,
 
   sub_l= hbytes_len(&sub);
   if (start < 0)
-    return staticerr(ip, "hbytes overwrite start -ve");
+    return staticerr(ip, "hbytes overwrite start -ve",
+		     "HBYTES LENGTH RANGE");
   if (start + sub_l > hbytes_len(v.hb))
-    return staticerr(ip, "hbytes overwrite out of range");
+    return staticerr(ip, "hbytes overwrite out of range",
+		     "HBYTES LENGTH UNDERRUN");
   memcpy(hbytes_data(v.hb) + start, hbytes_data(&sub), sub_l);
   return TCL_OK;
 }
@@ -229,8 +242,9 @@ int do_hbytes_repeat(ClientData cd, Tcl_Interp *ip,
   const Byte *sub_d;
 
   sub_l= hbytes_len(&sub);
-  if (count < 0) return staticerr(ip, "hbytes repeat count -ve");
-  if (count > INT_MAX/sub_l) return staticerr(ip, "hbytes repeat too long");
+  if (count < 0) return staticerr(ip, "hbytes repeat count -ve",
+				  "HBYTES LENGTH RANGE");
+  if (count > INT_MAX/sub_l) return staticerr(ip, "hbytes repeat too long", 0);
 
   data= hbytes_arrayspace(result, sub_l*count);
   sub_d= hbytes_data(&sub);
@@ -276,14 +290,49 @@ int do_hbytes_range(ClientData cd, Tcl_Interp *ip,
   int l;
 
   l= hbytes_len(&v);
-  if (start<0 || size<0 || l<start+size)
-    return staticerr(ip, "hbytes range subscripts out of range");
+  if (start<0 || size<0)
+    return staticerr(ip,"hbytes range subscript(s) -ve","HBYTES LENGTH RANGE");
+  if (l<start+size)
+    return staticerr(ip, "hbytes range subscripts too big",
+		     "HBYTES LENGTH UNDERRUN");
 
   data= hbytes_data(&v);
   hbytes_array(result, data+start, size);
   return TCL_OK;
 }
-  
+
+/* hbytes representing uint16_t's */
+
+int do_hbytes_h2ushort(ClientData cd, Tcl_Interp *ip,
+		       HBytes_Value hex, long *result) {
+  const Byte *data;
+  int l;
+
+  l= hbytes_len(&hex);
+  if (l>2)
+    return staticerr(ip, "hbytes h2ushort input more than 4 hex digits",
+		     "HBYTES VALUE OVERFLOW");
+
+  data= hbytes_data(&hex);
+  *result= data[l-1] | (l>1 ? data[0]<<8 : 0);
+  return TCL_OK;
+}
+
+int do_hbytes_ushort2h(ClientData cd, Tcl_Interp *ip,
+		       long input, HBytes_Value *result) {
+  uint16_t us;
+
+  if (input > 0x0ffff)
+    return staticerr(ip, "hbytes ushort2h input >2^16",
+		     "HBYTES VALUE OVERFLOW");
+
+  us= htons(input);
+  hbytes_array(result,(const Byte*)&us,2);
+  return TCL_OK;
+}
+
+/* toplevel functions */
+
 int do_toplevel_hbytes(ClientData cd, Tcl_Interp *ip,
 		       const HBytes_SubCommand *subcmd,
 		       int objc, Tcl_Obj *const *objv) {
@@ -323,7 +372,7 @@ int get_urandom(Tcl_Interp *ip, Byte *buffer, int l) {
     return posixerr(ip,errno,"read " URANDOM);
   } else {
     assert(feof(urandom));
-    return staticerr(ip, URANDOM " gave eof!");
+    return staticerr(ip, URANDOM " gave eof!", 0);
   }
 }