/*
 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "gen_locl.h"

RCSID("$Id: gen_copy.c 19539 2006-12-28 17:15:05Z lha $");

static int used_fail;

static void
copy_primitive (const char *typename, const char *from, const char *to)
{
    fprintf (codefile, "if(der_copy_%s(%s, %s)) goto fail;\n", 
	     typename, from, to);
    used_fail++;
}

static void
copy_type (const char *from, const char *to, const Type *t, int preserve)
{
    switch (t->type) {
    case TType:
#if 0
	copy_type (from, to, t->symbol->type, preserve);
#endif
	fprintf (codefile, "if(copy_%s(%s, %s)) goto fail;\n", 
		 t->symbol->gen_name, from, to);
	used_fail++;
	break;
    case TInteger:
	if (t->range == NULL && t->members == NULL) {
	    copy_primitive ("heim_integer", from, to);
	    break;
	}
    case TBoolean:
    case TEnumerated :
	fprintf(codefile, "*(%s) = *(%s);\n", to, from);
	break;
    case TOctetString:
	copy_primitive ("octet_string", from, to);
	break;
    case TBitString:
	if (ASN1_TAILQ_EMPTY(t->members))
	    copy_primitive ("bit_string", from, to);
	else
	    fprintf(codefile, "*(%s) = *(%s);\n", to, from);
	break;
    case TSet:
    case TSequence:
    case TChoice: {
	Member *m, *have_ellipsis = NULL;

	if(t->members == NULL)
	    break;
      
	if ((t->type == TSequence || t->type == TChoice) && preserve) {
	    fprintf(codefile,
		    "{ int ret;\n"
		    "ret = der_copy_octet_string(&(%s)->_save, &(%s)->_save);\n"
		    "if (ret) goto fail;\n"
		    "}\n",
		    from, to);
	    used_fail++;
	}

	if(t->type == TChoice) {
	    fprintf(codefile, "(%s)->element = (%s)->element;\n", to, from);
	    fprintf(codefile, "switch((%s)->element) {\n", from);
	}

	ASN1_TAILQ_FOREACH(m, t->members, members) {
	    char *fs;
	    char *ts;

	    if (m->ellipsis) {
		have_ellipsis = m;
		continue;
	    }

	    if(t->type == TChoice)
		fprintf(codefile, "case %s:\n", m->label);

	    asprintf (&fs, "%s(%s)->%s%s",
		      m->optional ? "" : "&", from, 
		      t->type == TChoice ? "u." : "", m->gen_name);
	    if (fs == NULL)
		errx(1, "malloc");
	    asprintf (&ts, "%s(%s)->%s%s",
		      m->optional ? "" : "&", to, 
		      t->type == TChoice ? "u." : "", m->gen_name);
	    if (ts == NULL)
		errx(1, "malloc");
	    if(m->optional){
		fprintf(codefile, "if(%s) {\n", fs);
		fprintf(codefile, "%s = malloc(sizeof(*%s));\n", ts, ts);
		fprintf(codefile, "if(%s == NULL) goto fail;\n", ts);
		used_fail++;
	    }
	    copy_type (fs, ts, m->type, FALSE);
	    if(m->optional){
		fprintf(codefile, "}else\n");
		fprintf(codefile, "%s = NULL;\n", ts);
	    }
	    free (fs);
	    free (ts);
	    if(t->type == TChoice)
		fprintf(codefile, "break;\n");
	}
	if(t->type == TChoice) {
	    if (have_ellipsis) {
		fprintf(codefile, "case %s: {\n"
			"int ret;\n"
			"ret=der_copy_octet_string(&(%s)->u.%s, &(%s)->u.%s);\n"
			"if (ret) goto fail;\n"
			"break;\n"
			"}\n",
			have_ellipsis->label,
			from, have_ellipsis->gen_name, 
			to, have_ellipsis->gen_name);
		used_fail++;
	    }
	    fprintf(codefile, "}\n");	
	}
	break;
    }
    case TSetOf:
    case TSequenceOf: {
	char *f;
	char *T;

	fprintf (codefile, "if(((%s)->val = "
		 "malloc((%s)->len * sizeof(*(%s)->val))) == NULL && (%s)->len != 0)\n", 
		 to, from, to, from);
	fprintf (codefile, "goto fail;\n");
	used_fail++;
	fprintf(codefile,
		"for((%s)->len = 0; (%s)->len < (%s)->len; (%s)->len++){\n",
		to, to, from, to);
	asprintf(&f, "&(%s)->val[(%s)->len]", from, to);
	if (f == NULL)
	    errx(1, "malloc");
	asprintf(&T, "&(%s)->val[(%s)->len]", to, to);
	if (T == NULL)
	    errx(1, "malloc");
	copy_type(f, T, t->subtype, FALSE);
	fprintf(codefile, "}\n");
	free(f);
	free(T);
	break;
    }
    case TGeneralizedTime:
	fprintf(codefile, "*(%s) = *(%s);\n", to, from);
	break;
    case TGeneralString:
	copy_primitive ("general_string", from, to);
	break;
    case TUTCTime:
	fprintf(codefile, "*(%s) = *(%s);\n", to, from);
	break;
    case TUTF8String:
	copy_primitive ("utf8string", from, to);
	break;
    case TPrintableString:
	copy_primitive ("printable_string", from, to);
	break;
    case TIA5String:
	copy_primitive ("ia5_string", from, to);
	break;
    case TBMPString:
	copy_primitive ("bmp_string", from, to);
	break;
    case TUniversalString:
	copy_primitive ("universal_string", from, to);
	break;
    case TVisibleString:
	copy_primitive ("visible_string", from, to);
	break;
    case TTag:
	copy_type (from, to, t->subtype, preserve);
	break;
    case TOID:
	copy_primitive ("oid", from, to);
	break;
    case TNull:
	break;
    default :
	abort ();
    }
}

void
generate_type_copy (const Symbol *s)
{
  int preserve = preserve_type(s->name) ? TRUE : FALSE;

  used_fail = 0;

  fprintf (headerfile,
	   "int    copy_%s  (const %s *, %s *);\n",
	   s->gen_name, s->gen_name, s->gen_name);

  fprintf (codefile, "int\n"
	   "copy_%s(const %s *from, %s *to)\n"
	   "{\n"
	   "memset(to, 0, sizeof(*to));\n",
	   s->gen_name, s->gen_name, s->gen_name);
  copy_type ("from", "to", s->type, preserve);
  fprintf (codefile, "return 0;\n");

  if (used_fail)
      fprintf (codefile, "fail:\n"
	       "free_%s(to);\n"
	       "return ENOMEM;\n",
	       s->gen_name);

  fprintf(codefile,
	  "}\n\n");
}

