Builds a working plugin.

[chiark-tcl.git] / hbytes / hbytes.c

diff --git a/hbytes/hbytes.c b/hbytes/hbytes.c
new file mode 100644 (file)
index 0000000..99bddfe
--- /dev/null
+++ b/hbytes/hbytes.c
@@ -0,0 +1,165 @@
+/*
+ *
+ */
+
+#include "hbytes.h"
+
+int staticerr(Tcl_Interp *ip, const char *m) {
+  Tcl_SetResult(ip, (char*)m, TCL_STATIC);
+  return TCL_ERROR;
+}
+
+static void hbytes_setintern(Tcl_Obj *o, const Byte *array, int l) {
+  Byte *np;
+    
+  HBYTES(o)->start= np= l ? TALLOC(l) : 0;
+  memcpy(np, array, l);
+  HBYTES(o)->end= np + l;
+  o->typePtr = &hbytes_type;
+}
+
+static void hbytes_t_dup(Tcl_Obj *src, Tcl_Obj *dup) {
+  hbytes_setintern(src, HBYTES(src)->start, HBYTES_LEN(src));
+}
+
+Tcl_Obj *hbytes_set(Tcl_Obj *overwrite, const Byte *array, int l) {
+  if (!overwrite) overwrite= Tcl_NewObj();
+  objfreeir(overwrite);
+  Tcl_InvalidateStringRep(overwrite);
+  hbytes_setintern(overwrite, array, l);
+  return overwrite;
+}
+
+static void hbytes_t_free(Tcl_Obj *o) {
+  TFREE(HBYTES(o)->start);
+}
+
+static void hbytes_t_ustr(Tcl_Obj *o) {
+  int l;
+  char *str;
+  const Byte *byte;
+
+  l= HBYTES_LEN(o);
+  byte= HBYTES(o)->start;
+  str= o->bytes= TALLOC(l*2+1);
+  o->length= l*2;
+  while (l>0) {
+    sprintf(str,"%02x",*byte);
+    str+=2; byte++; l--;
+  }
+}
+
+void objfreeir(Tcl_Obj *o) {
+  if (o->typePtr && o->typePtr->freeIntRepProc)
+    o->typePtr->freeIntRepProc(o);
+}  
+
+static int hbytes_t_sfa(Tcl_Interp *ip, Tcl_Obj *o) {
+  char *str, *ep, *os;
+  Byte *startbytes, *bytes;
+  int l;
+  char cbuf[3];
+
+  os= str= Tcl_GetStringFromObj(o,&l);  assert(str);
+  if (l & 1) return staticerr(ip, "hbytes: conversion from hex:"
+                             " odd length in hex");
+
+  startbytes= bytes= l ? TALLOC(l*2) : 0;
+  cbuf[2]= 0;
+  while (l>0) {
+    cbuf[0]= *str++;
+    cbuf[1]= *str++;
+    *bytes++= strtoul(cbuf,&ep,16);
+    if (ep != cbuf+2) {
+      TFREE(startbytes);
+fprintf(stderr,">%d|%s|%s<\n",l,os,cbuf);
+      return staticerr(ip, "hbytes: conversion from hex:"
+                      " bad hex digit");
+    }
+    l -= 2;
+  }
+  objfreeir(o);
+
+  HBYTES(o)->start= startbytes;
+  HBYTES(o)->end= bytes;
+  o->typePtr = &hbytes_type;
+  return TCL_OK;
+}
+
+Tcl_ObjType hbytes_type = {
+  "hbytes",
+  hbytes_t_free, hbytes_t_dup, hbytes_t_ustr, hbytes_t_sfa
+};
+
+static Tcl_Obj *hb_getvar(Tcl_Interp *ip, Tcl_Obj *varname) {
+  int ec;
+  Tcl_Obj *value;
+  
+  value= Tcl_ObjGetVar2(ip,varname,0,TCL_LEAVE_ERR_MSG);
+  if (!value) return 0;
+
+  ec= Tcl_ConvertToType(ip,value,&hbytes_type);
+  if (ec) return 0;
+
+  return value;
+}
+
+static int hc_bin(ClientData cd, Tcl_Interp *ip, int objc,
+                 Tcl_Obj *const *objv) {
+  Tcl_Obj *varname, *value, *result;
+  const char *str;
+  int l;
+
+  varname= objv[0];
+  switch (objc) {
+  case 1:
+    value= hb_getvar(ip,varname);  if (!value) return TCL_ERROR;
+    result= Tcl_NewStringObj(HBYTES(value)->start, HBYTES_LEN(value));
+    assert(result);
+    Tcl_SetObjResult(ip,result);
+    return TCL_OK;
+  case 2:
+    value= objv[1];
+    str= Tcl_GetStringFromObj(value,&l);
+    value= hbytes_set(0,str,l);
+    value= Tcl_ObjSetVar2(ip,varname,0, value, TCL_LEAVE_ERR_MSG);
+    if (!value) return TCL_ERROR;
+    Tcl_ResetResult(ip);
+    return TCL_OK;
+  }
+  abort();
+}
+
+typedef struct {
+  const char *name;
+  int minargs, maxargs;
+  Tcl_ObjCmdProc *func;
+} SubCommand;
+
+static const SubCommand subcommands[] = {
+  { "bin", 1, 2, hc_bin },
+  { 0 }
+};
+
+static int hb_proc(ClientData cd, Tcl_Interp *ip, int objc,
+                  Tcl_Obj *const *objv) {
+  const SubCommand *sc;
+
+  if (objc<2) return staticerr(ip, "hbytes: need subcommand");
+  sc= enum_lookup_cached(ip,objv[1],subcommands,"hbytes subcommand");
+  if (!sc) return TCL_ERROR;
+  objc -= 2;
+  objv += 2;
+  if (objc < sc->minargs)
+    return staticerr(ip, "too few args");
+  if (sc->maxargs >=0 && objc > sc->maxargs)
+    return staticerr(ip,"too many args");
+  return sc->func((void*)sc,ip,objc,objv);
+}
+
+int Hbytes_Init(Tcl_Interp *ip) {
+  Tcl_RegisterObjType(&hbytes_type);
+  Tcl_RegisterObjType(&enum_nearlytype);
+  Tcl_CreateObjCommand(ip,"hbytes", hb_proc,0,0);
+  return TCL_OK;
+}