/*
 * $Id: val.c 380 2008-09-24 08:16:41Z baconevi $
 *
 * {License}
 */

#include "awk.h"

#ifdef DEBUG_VAL
#include <ase/utl/stdio.h>
#endif

#define CHUNKSIZE 100

typedef struct ase_awk_val_ichunk_t ase_awk_val_ichunk_t;
typedef struct ase_awk_val_rchunk_t ase_awk_val_rchunk_t;

struct ase_awk_val_chunk_t
{
        ase_awk_val_chunk_t* next;
};

struct ase_awk_val_ichunk_t
{
	ase_awk_val_chunk_t* next;
	/* make sure that it has the same fields as 
	   ase_awk_val_chunk_t up to this point */

	ase_awk_val_int_t slot[CHUNKSIZE];
};

struct ase_awk_val_rchunk_t
{
	ase_awk_val_chunk_t* next;
	/* make sure that it has the same fields as 
	   ase_awk_val_chunk_t up to this point */

	ase_awk_val_real_t slot[CHUNKSIZE];
};

static ase_char_t* str_to_str (
	ase_awk_run_t* run, const ase_char_t* str, ase_size_t str_len,
	int opt, ase_str_t* buf, ase_size_t* len);

static ase_char_t* val_int_to_str (
	ase_awk_run_t* run, ase_awk_val_int_t* v,
	int opt, ase_str_t* buf, ase_size_t* len);

static ase_char_t* val_real_to_str (
	ase_awk_run_t* run, ase_awk_val_real_t* v,
	int opt, ase_str_t* buf, ase_size_t* len);

static ase_awk_val_nil_t awk_nil = { ASE_AWK_VAL_NIL, 0 };
static ase_awk_val_str_t awk_zls = { ASE_AWK_VAL_STR, 0, ASE_T(""), 0 };

ase_awk_val_t* ase_awk_val_nil = (ase_awk_val_t*)&awk_nil;
ase_awk_val_t* ase_awk_val_zls = (ase_awk_val_t*)&awk_zls; 

static ase_awk_val_int_t awk_int[] =
{
	{ ASE_AWK_VAL_INT, 0, -1, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  0, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  1, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  2, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  3, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  4, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  5, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  6, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  7, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  8, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0,  9, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 10, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 11, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 12, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 13, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 14, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 15, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 16, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 17, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 18, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 19, ASE_NULL },
	{ ASE_AWK_VAL_INT, 0, 20, ASE_NULL }
};

ase_awk_val_t* ase_awk_val_negone = (ase_awk_val_t*)&awk_int[0];
ase_awk_val_t* ase_awk_val_zero = (ase_awk_val_t*)&awk_int[1];
ase_awk_val_t* ase_awk_val_one = (ase_awk_val_t*)&awk_int[2];

ase_awk_val_t* ase_awk_makeintval (ase_awk_run_t* run, ase_long_t v)
{
	ase_awk_val_int_t* val;

	if (v >= awk_int[0].val && 
	    v <= awk_int[ASE_COUNTOF(awk_int)-1].val)
	{
		return (ase_awk_val_t*)&awk_int[v-awk_int[0].val];
	}

	/*
	if (run->icache_count > 0)
	{
		val = run->icache[--run->icache_count];
	}
	else
	{
		val = (ase_awk_val_int_t*) ASE_AWK_ALLOC (
			run->awk, ASE_SIZEOF(ase_awk_val_int_t));
		if (val == ASE_NULL) 
		{
			ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
			return ASE_NULL;
		}
	}
	*/

	if (run->vmgr.ifree == ASE_NULL)
	{
		ase_awk_val_ichunk_t* c;
		ase_awk_val_int_t* x;
		ase_size_t i;

		/* use ase_awk_val_ichunk structure to avoid
		 * any alignment issues on platforms requiring
		 * aligned memory access - using the code commented out
		 * will cause a fault on such a platform */

		/* c = ASE_AWK_ALLOC (run->awk, 
			ASE_SIZEOF(ase_awk_val_chunk_t)+
			ASE_SIZEOF(ase_awk_val_int_t)*CHUNKSIZE); */
		c = ASE_AWK_ALLOC (run->awk, ASE_SIZEOF(ase_awk_val_ichunk_t));
		if (c == ASE_NULL)
		{
			ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
			return ASE_NULL;
		}

		c->next = run->vmgr.ichunk;
		/*run->vmgr.ichunk = c;*/
		run->vmgr.ichunk = (ase_awk_val_chunk_t*)c;

		/*x = (ase_awk_val_int_t*)(c + 1);
		for (i = 0; i < CHUNKSIZE-1; i++) 
			x[i].nde = (ase_awk_nde_int_t*)&x[i+1];
		x[i].nde = ASE_NULL;

		run->vmgr.ifree = x;
		*/

		for (i = 0; i < CHUNKSIZE-1; i++)
			c->slot[i].nde = (ase_awk_nde_int_t*)&c->slot[i+1];
		c->slot[i].nde = ASE_NULL;

		run->vmgr.ifree = &c->slot[0];
	}

	val = run->vmgr.ifree;
	run->vmgr.ifree = (ase_awk_val_int_t*)val->nde;

	val->type = ASE_AWK_VAL_INT;
	val->ref = 0;
	val->val = v;
	val->nde = ASE_NULL;

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("makeintval => %ld [%p]\n"), (long)v, val);
#endif
	return (ase_awk_val_t*)val;
}

ase_awk_val_t* ase_awk_makerealval (ase_awk_run_t* run, ase_real_t v)
{
	ase_awk_val_real_t* val;

	/*
	if (run->rcache_count > 0)
	{
		val = run->rcache[--run->rcache_count];
	}
	else
	{
		val = (ase_awk_val_real_t*) ASE_AWK_ALLOC (
			run->awk, ASE_SIZEOF(ase_awk_val_real_t));
		if (val == ASE_NULL)
		{
			ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
			return ASE_NULL;
		}
	}
	*/

	if (run->vmgr.rfree == ASE_NULL)
	{
		ase_awk_val_rchunk_t* c;
		ase_awk_val_real_t* x;
		ase_size_t i;

		/* c = ASE_AWK_ALLOC (run->awk, 
			ASE_SIZEOF(ase_awk_val_chunk_t)+
			ASE_SIZEOF(ase_awk_val_real_t)*CHUNKSIZE); */
		c = ASE_AWK_ALLOC (run->awk, ASE_SIZEOF(ase_awk_val_rchunk_t));
		if (c == ASE_NULL)
		{
			ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
			return ASE_NULL;
		}

		c->next = run->vmgr.rchunk;
		/*run->vmgr.rchunk = c;*/
		run->vmgr.rchunk = (ase_awk_val_chunk_t*)c;

		/*
		x = (ase_awk_val_real_t*)(c + 1);
		for (i = 0; i < CHUNKSIZE-1; i++) 
			x[i].nde = (ase_awk_nde_real_t*)&x[i+1];
		x[i].nde = ASE_NULL;

		run->vmgr.rfree = x;
		*/

		for (i = 0; i < CHUNKSIZE-1; i++)
			c->slot[i].nde = (ase_awk_nde_real_t*)&c->slot[i+1];
		c->slot[i].nde = ASE_NULL;

		run->vmgr.rfree = &c->slot[0];
	}

	val = run->vmgr.rfree;
	run->vmgr.rfree = (ase_awk_val_real_t*)val->nde;

	val->type = ASE_AWK_VAL_REAL;
	val->ref = 0;
	val->val = v;
	val->nde = ASE_NULL;

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("makerealval => %Lf [%p]\n"), (double)v, val);
#endif
	return (ase_awk_val_t*)val;
}

ase_awk_val_t* ase_awk_makestrval0 (ase_awk_run_t* run, const ase_char_t* str)
{
	return ase_awk_makestrval (run, str, ase_strlen(str));
}

ase_awk_val_t* ase_awk_makestrval (
	ase_awk_run_t* run, const ase_char_t* str, ase_size_t len)
{
	ase_awk_val_str_t* val;
	ase_size_t rlen = len;

	/*if (rlen <= 32)
	{
		if (run->scache32_count > 0)
		{
			val = run->scache32[--run->scache32_count];
			goto init;
		}
		rlen = 32;
	}
	else if (rlen <= 64)
	{
		if (run->scache64_count > 0)
		{
			val = run->scache64[--run->scache64_count];
			goto init;
		}
		rlen = 64;
	}*/
	
	val = (ase_awk_val_str_t*) ASE_AWK_ALLOC (
		run->awk, 
		ASE_SIZEOF(ase_awk_val_str_t) + 
		(rlen+1)*ASE_SIZEOF(ase_char_t));
	if (val == ASE_NULL) 
	{
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}

init:
	val->type = ASE_AWK_VAL_STR;
	val->ref = 0;
	val->len = len;
	val->buf = (ase_char_t*)(val + 1);
	/*ase_strxncpy (val->buf, len+1, str, len);*/
	ase_strncpy (val->buf, str, len);

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("makestrval => %p\n"), val);
#endif
	return (ase_awk_val_t*)val;
}

ase_awk_val_t* ase_awk_makestrval_nodup (
	ase_awk_run_t* run, ase_char_t* str, ase_size_t len)
{
	ase_awk_val_str_t* val;

	val = (ase_awk_val_str_t*) ASE_AWK_ALLOC (
		run->awk, ASE_SIZEOF(ase_awk_val_str_t));
	if (val == ASE_NULL) 
	{
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}

	val->type = ASE_AWK_VAL_STR;
	val->ref = 0;
	val->len = len;
	val->buf = str;
	return (ase_awk_val_t*)val;
}

ase_awk_val_t* ase_awk_makestrval2 (
	ase_awk_run_t* run,
	const ase_char_t* str1, ase_size_t len1, 
	const ase_char_t* str2, ase_size_t len2)
{
	ase_awk_val_str_t* val;
	ase_size_t rlen = len1 + len2;

	/*if (rlen <= 32)
	{
		if (run->scache32_count > 0)
		{
			val = run->scache32[--run->scache32_count];
			goto init;
		}
		rlen = 32;
	}
	else if (rlen <= 64)
	{
		if (run->scache64_count > 0)
		{
			val = run->scache64[--run->scache64_count];
			goto init;
		}
		rlen = 64;
	}*/

	val = (ase_awk_val_str_t*) ASE_AWK_ALLOC (
		run->awk, 
		ASE_SIZEOF(ase_awk_val_str_t) +
		(rlen+1)*ASE_SIZEOF(ase_char_t));
	if (val == ASE_NULL) 
	{
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}

init:
	val->type = ASE_AWK_VAL_STR;
	val->ref = 0;
	val->len = len1 + len2;
	val->buf = (ase_char_t*)(val + 1);
	/*ase_strxncpy (val->buf, len1+1, str1, len1);
	ase_strxncpy (val->buf[len1], len2+1, str2, len2);*/
	ase_strncpy (val->buf, str1, len1);
	ase_strncpy (&val->buf[len1], str2, len2);

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("makestrval2 => %p\n"), val);
#endif
	return (ase_awk_val_t*)val;
}

ase_awk_val_t* ase_awk_makerexval (
	ase_awk_run_t* run, const ase_char_t* buf, ase_size_t len, void* code)
{
	ase_awk_val_rex_t* val;

	val = (ase_awk_val_rex_t*) ASE_AWK_ALLOC (
		run->awk, ASE_SIZEOF(ase_awk_val_rex_t) + 
		(ASE_SIZEOF(*buf)*len+1) + ASE_REX_LEN(code));
	if (val == ASE_NULL) return ASE_NULL;

	val->type = ASE_AWK_VAL_REX;
	val->ref = 0;
	val->len = len;
	/*
	val->buf = ASE_AWK_STRXDUP (run->awk, buf, len);
	if (val->buf == ASE_NULL) 
	{
		ASE_AWK_FREE (run->awk, val);
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}*/
	val->buf = (ase_char_t*)(val + 1);
	ase_strncpy (val->buf, buf, len);

	/*
	val->code = ASE_AWK_ALLOC (run->awk, ASE_REX_LEN(code));
	if (val->code == ASE_NULL)
	{
		ASE_AWK_FREE (run->awk, val->buf);
		ASE_AWK_FREE (run->awk, val);
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}
	*/
	val->code = val->buf + len + 1;
	ASE_MEMCPY (val->code, code, ASE_REX_LEN(code));

	return (ase_awk_val_t*)val;
}

/* CHECK */
/*
static void free_mapval (void* run, void* v)
{
#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("refdown in map free..."));
	ase_awk_dprintval (run, v);
	ase_dprintf (ASE_T("\n"));
#endif

	ase_awk_refdownval (run, v);
}

static void same_mapval (void* run, void* v)
{
#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("refdown nofree in map free..."));
	ase_awk_dprintval (run, v);
	ase_dprintf (ASE_T("\n"));
#endif
	ase_awk_refdownval_nofree (run, v);
}
*/
static void free_mapval (ase_map_t* map, void* dptr, ase_size_t dlen)
{
	ase_awk_run_t* run = *(ase_awk_run_t**)ASE_MAP_EXTENSION(map);

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("refdown in map free..."));
	ase_awk_dprintval (run, dptr);
	ase_dprintf (ASE_T("\n"));
#endif

	ase_awk_refdownval (run, dptr);
}

static void same_mapval (ase_map_t* map, void* dptr, ase_size_t dlen)
{
	ase_awk_run_t* run = *(ase_awk_run_t**)ASE_MAP_EXTENSION(map);
#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("refdown nofree in map free..."));
	ase_awk_dprintval (run, dptr);
	ase_dprintf (ASE_T("\n"));
#endif
	ase_awk_refdownval_nofree (run, dptr);
}
/* END CHECK */

ase_awk_val_t* ase_awk_makemapval (ase_awk_run_t* run)
{
	ase_awk_val_map_t* val;

	val = (ase_awk_val_map_t*) ASE_AWK_ALLOC (
		run->awk, ASE_SIZEOF(ase_awk_val_map_t));
	if (val == ASE_NULL) 
	{
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}

	val->type = ASE_AWK_VAL_MAP;
	val->ref = 0;
	/* CHECK */
	/* 
	val->map = ase_map_open (
		run, 256, 70, free_mapval, same_mapval, run->awk->mmgr);
	if (val->map == ASE_NULL)
	{
		ASE_AWK_FREE (run->awk, val);
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}
	*/
	val->map = ase_map_open (run->awk->mmgr, ASE_SIZEOF(run), 256, 70);
	if (val->map == ASE_NULL)
	{
		ASE_AWK_FREE (run->awk, val);
		ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
		return ASE_NULL;
	}
	*(ase_awk_run_t**)ASE_MAP_EXTENSION(val->map) = run;

	/* the key is copied inline into a pair and is freed when the pair
	 * is destroyed */
	ase_map_setcopier (val->map, ASE_MAP_KEY, ASE_MAP_COPIER_INLINE);

	/* not setting copier for a value means that the pointer to the data 
	 * allocated somewhere else is remembered in a pair. but the freeing 
	 * the actual value is handled by free_mapval and same_mapval */
	ase_map_setfreeer (val->map, ASE_MAP_VAL, free_mapval);
	ase_map_setkeeper (val->map, same_mapval);
	/* END CHECK */

	return (ase_awk_val_t*)val;
}

ase_awk_val_t* ase_awk_makerefval (ase_awk_run_t* run, int id, ase_awk_val_t** adr)
{
	ase_awk_val_ref_t* val;

	if (run->fcache_count > 0)
	{
		val = run->fcache[--run->fcache_count];
	}
	else
	{
		val = (ase_awk_val_ref_t*) ASE_AWK_ALLOC (
			run->awk, ASE_SIZEOF(ase_awk_val_ref_t));
		if (val == ASE_NULL)
		{
			ase_awk_setrunerrnum (run, ASE_AWK_ENOMEM);
			return ASE_NULL;
		}
	}

	val->type = ASE_AWK_VAL_REF;
	val->ref = 0;
	val->id = id;
	val->adr = adr;

	return (ase_awk_val_t*)val;
}

#define IS_STATICVAL(val) \
	((val) == ASE_NULL || \
	 (val) == ase_awk_val_nil || \
	 (val) == ase_awk_val_zls || \
	 (val) == ase_awk_val_zero || \
	 (val) == ase_awk_val_one || \
	 ((val) >= (ase_awk_val_t*)&awk_int[0] && \
	  (val) <= (ase_awk_val_t*)&awk_int[ASE_COUNTOF(awk_int)-1]))

ase_bool_t ase_awk_isstaticval (ase_awk_val_t* val)
{
	return IS_STATICVAL(val);
}

void ase_awk_freeval (ase_awk_run_t* run, ase_awk_val_t* val, ase_bool_t cache)
{
	if (IS_STATICVAL(val)) return;

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("freeing [cache=%d] ... "), cache);
	ase_awk_dprintval (run, val);
	ase_dprintf (ASE_T("\n"));
#endif

	if (val->type == ASE_AWK_VAL_NIL)
	{
		ASE_AWK_FREE (run->awk, val);
	}
	else if (val->type == ASE_AWK_VAL_INT)
	{
		/*
		if (cache && run->icache_count < ASE_COUNTOF(run->icache))
		{
			run->icache[run->icache_count++] = 
				(ase_awk_val_int_t*)val;	
		}
		else ASE_AWK_FREE (run->awk, val);
		*/
			
		((ase_awk_val_int_t*)val)->nde = (ase_awk_nde_int_t*)run->vmgr.ifree;
		run->vmgr.ifree = (ase_awk_val_int_t*)val;
	}
	else if (val->type == ASE_AWK_VAL_REAL)
	{
		/*
		if (cache && run->rcache_count < ASE_COUNTOF(run->rcache))
		{
			run->rcache[run->rcache_count++] = 
				(ase_awk_val_real_t*)val;	
		}
		else ASE_AWK_FREE (run->awk, val);
		*/
		((ase_awk_val_real_t*)val)->nde = (ase_awk_nde_real_t*)run->vmgr.rfree;
		run->vmgr.rfree = (ase_awk_val_real_t*)val;
	}
	else if (val->type == ASE_AWK_VAL_STR)
	{
		/*
		if (cache)
		{
			ase_awk_val_str_t* v = (ase_awk_val_str_t*)val;
			if (v->len <= 32 && 
			    run->scache32_count<ASE_COUNTOF(run->scache32))
			{
				run->scache32[run->scache32_count++] = v;
			}
			else if (v->len <= 64 && 
			         run->scache64_count<ASE_COUNTOF(run->scache64))
			{
				run->scache64[run->scache64_count++] = v;
			}
			else ASE_AWK_FREE (run->awk, val);
		}
		else*/ ASE_AWK_FREE (run->awk, val);
	}
	else if (val->type == ASE_AWK_VAL_REX)
	{
		/*
		ASE_AWK_FREE (run->awk, ((ase_awk_val_rex_t*)val)->buf);
		ASE_AWK_FREEREX (run->awk, ((ase_awk_val_rex_t*)val)->code);
		*/
		ASE_AWK_FREE (run->awk, val);
	}
	else if (val->type == ASE_AWK_VAL_MAP)
	{
		ase_map_close (((ase_awk_val_map_t*)val)->map);
		ASE_AWK_FREE (run->awk, val);
	}
	else if (val->type == ASE_AWK_VAL_REF)
	{
		if (cache && run->fcache_count < ASE_COUNTOF(run->fcache))
		{
			run->fcache[run->fcache_count++] = 
				(ase_awk_val_ref_t*)val;	
		}
		else ASE_AWK_FREE (run->awk, val);
	}
	else
	{
		ASE_ASSERTX (
			!"should never happen - invalid value type",
			"the type of a value should be one of ASE_AWK_VAL_XXX's defined in awk.h");
	}
}

void ase_awk_refupval (ase_awk_run_t* run, ase_awk_val_t* val)
{
	if (IS_STATICVAL(val)) return;

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("ref up [ptr=%p] [count=%d] "), val, (int)val->ref);
	ase_awk_dprintval (run, val);
	ase_dprintf (ASE_T("\n"));
#endif

	val->ref++;
}

void ase_awk_refdownval (ase_awk_run_t* run, ase_awk_val_t* val)
{
	if (IS_STATICVAL(val)) return;

#ifdef DEBUG_VAL
	ase_dprintf (ASE_T("ref down [ptr=%p] [count=%d]\n"), val, (int)val->ref);
	ase_awk_dprintval (run, val);
	ase_dprintf (ASE_T("\n"));
#endif

	ASE_ASSERTX (val->ref > 0, 
		"the reference count of a value should be greater than zero for it to be decremented. check the source code for any bugs");

	val->ref--;
	if (val->ref <= 0) 
	{
		ase_awk_freeval(run, val, ASE_TRUE);
	}
}

void ase_awk_refdownval_nofree (ase_awk_run_t* run, ase_awk_val_t* val)
{
	if (IS_STATICVAL(val)) return;

	ASE_ASSERTX (val->ref > 0,
		"the reference count of a value should be greater than zero for it to be decremented. check the source code for any bugs");
	val->ref--;
}

void ase_awk_freevalchunk (ase_awk_run_t* run, ase_awk_val_chunk_t* chunk)
{
	while (chunk != ASE_NULL)
        {
		ase_awk_val_chunk_t* next = chunk->next;
		ASE_AWK_FREE (run->awk, chunk);
		chunk = next;
	}
}

ase_bool_t ase_awk_valtobool (ase_awk_run_t* run, ase_awk_val_t* val)
{
	if (val == ASE_NULL) return ASE_FALSE;

	switch (val->type)
	{
		case ASE_AWK_VAL_NIL:
			return ASE_FALSE;
		case ASE_AWK_VAL_INT:
			return ((ase_awk_val_int_t*)val)->val != 0;
		case ASE_AWK_VAL_REAL:
			return ((ase_awk_val_real_t*)val)->val != 0.0;
		case ASE_AWK_VAL_STR:
			return ((ase_awk_val_str_t*)val)->len > 0;
		case ASE_AWK_VAL_REX: /* TODO: is this correct? */
			return ((ase_awk_val_rex_t*)val)->len > 0;
		case ASE_AWK_VAL_MAP:
			return ASE_FALSE; /* TODO: is this correct? */
		case ASE_AWK_VAL_REF:
			return ASE_FALSE; /* TODO: is this correct? */
	}

	ASE_ASSERTX (
		!"should never happen - invalid value type",
		"the type of a value should be one of ASE_AWK_VAL_XXX's defined in awk.h");
	return ASE_FALSE;
}

ase_char_t* ase_awk_valtostr (
	ase_awk_run_t* run, ase_awk_val_t* v,
	int opt, ase_str_t* buf, ase_size_t* len)
{
	if (v->type == ASE_AWK_VAL_NIL)
	{
		return str_to_str (run, ASE_T(""), 0, opt, buf, len);
	}

	if (v->type == ASE_AWK_VAL_INT)
	{
		ase_awk_val_int_t* vi = (ase_awk_val_int_t*)v;

		/*
		if (vi->nde != ASE_NULL && vi->nde->str != ASE_NULL)
		{
			return str_to_str (
				run, vi->nde->str, vi->nde->len, 
				opt, buf, len);
		}
		else
		{*/
			return val_int_to_str (run, vi, opt, buf, len);
		/*}*/
	}

	if (v->type == ASE_AWK_VAL_REAL)
	{
		ase_awk_val_real_t* vr = (ase_awk_val_real_t*)v;

		/*
		if (vr->nde != ASE_NULL && vr->nde->str != ASE_NULL)
		{
			return str_to_str (
				run, vr->nde->str, vr->nde->len, 
				opt, buf, len);
		}
		else
		{*/
			return val_real_to_str (run, vr, opt, buf, len);
		/*}*/
	}

	if (v->type == ASE_AWK_VAL_STR) 
	{
		ase_awk_val_str_t* vs = (ase_awk_val_str_t*)v;

		return str_to_str (
			run, vs->buf, vs->len, opt, buf, len);
	}

#ifdef DEBUG_VAL
	ase_dprintf (
		ASE_T("ERROR: WRONG VALUE TYPE [%d] in ase_awk_valtostr\n"), 
		v->type);
#endif

	ase_awk_setrunerror (run, ASE_AWK_EVALTYPE, 0, ASE_NULL, 0);
	return ASE_NULL;
}

static ase_char_t* str_to_str (
	ase_awk_run_t* run, const ase_char_t* str, ase_size_t str_len,
	int opt, ase_str_t* buf, ase_size_t* len)
{
	if (buf == ASE_NULL)
	{
		ase_char_t* tmp;
		tmp = ASE_AWK_STRXDUP (run->awk, str, str_len);
		if (tmp == ASE_NULL) 
		{
			ase_awk_setrunerror (
				run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
			return ASE_NULL;
		}

		if (len != ASE_NULL) *len = str_len;
		return tmp;
	}
	else if (opt & ASE_AWK_VALTOSTR_FIXED)
	{
		ASE_ASSERT (buf != ASE_NULL && len != ASE_NULL);

		if (str_len >= *len)
		{
			ase_awk_setrunerror (
				run, ASE_AWK_EINVAL, 0, ASE_NULL, 0);
			*len = str_len + 1;
			return ASE_NULL;
		}

		*len = ase_strncpy ((ase_char_t*)buf, str, str_len);
		return (ase_char_t*)buf;
	}
	else
	{
		ase_size_t n;

		if (opt & ASE_AWK_VALTOSTR_CLEAR) ase_str_clear (buf);
		n = ase_str_ncat (buf, str, str_len);
		if (n == (ase_size_t)-1)
		{
			ase_awk_setrunerror (
				run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
			return ASE_NULL;
		}

		if (len != ASE_NULL) *len = ASE_STR_LEN(buf);
		return ASE_STR_PTR(buf);
	}
}

static ase_char_t* val_int_to_str (
	ase_awk_run_t* run, ase_awk_val_int_t* v,
	int opt, ase_str_t* buf, ase_size_t* len)
{
	ase_char_t* tmp;
	ase_long_t t;
	ase_size_t rlen = 0;

	t = v->val; 
	if (t == 0)
	{
		/* handle zero */
		if (buf == ASE_NULL)
		{
			tmp = ASE_AWK_ALLOC (
				run->awk, 2 * ASE_SIZEOF(ase_char_t));
			if (tmp == ASE_NULL)
			{
				ase_awk_setrunerror (
					run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
				return ASE_NULL;
			}

			tmp[0] = ASE_T('0');
			tmp[1] = ASE_T('\0');
			if (len != ASE_NULL) *len = 1;
			return tmp;
		}
		else if (opt & ASE_AWK_VALTOSTR_FIXED)
		{
			ASE_ASSERT (buf != ASE_NULL && len != ASE_NULL);
	
			if (1 >= *len)
			{
				ase_awk_setrunerror (
					run, ASE_AWK_EINVAL, 0, ASE_NULL, 0);
				*len = 2; /* buffer size required */
				return ASE_NULL;
			}

			tmp = (ase_char_t*)buf;
			tmp[0] = ASE_T('0');
			tmp[1] = ASE_T('\0');
			*len = 1; /* actual length */
			return tmp;
		}
		else
		{
			if (opt & ASE_AWK_VALTOSTR_CLEAR) ase_str_clear (buf);
			if (ase_str_cat (buf, ASE_T("0")) == (ase_size_t)-1)
			{
				ase_awk_setrunerror (
					run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
				return ASE_NULL;
			}

			if (len != ASE_NULL) *len = ASE_STR_LEN(buf);
			return ASE_STR_PTR(buf);
		}
	}

	/* non-zero values */
	if (t < 0) { t = -t; rlen++; }
	while (t > 0) { rlen++; t /= 10; }

	if (buf == ASE_NULL)
	{
		tmp = ASE_AWK_ALLOC (
			run->awk, (rlen + 1) * ASE_SIZEOF(ase_char_t));
		if (tmp == ASE_NULL)
		{
			ase_awk_setrunerror (
				run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
			return ASE_NULL;
		}

		tmp[rlen] = ASE_T('\0');
		if (len != ASE_NULL) *len = rlen;
	}
	else if (opt & ASE_AWK_VALTOSTR_FIXED)
	{
		ASE_ASSERT (buf != ASE_NULL && len != ASE_NULL);

		if (rlen >= *len)
		{
			ase_awk_setrunerror (
				run, ASE_AWK_EINVAL, 0, ASE_NULL, 0);
			*len = rlen + 1; /* buffer size required */
			return ASE_NULL;
		}

		tmp = (ase_char_t*)buf;
		tmp[rlen] = ASE_T('\0');
		*len = rlen; /* actual length */
	}
	else
	{
		/* clear the buffer */
		if (opt & ASE_AWK_VALTOSTR_CLEAR) ase_str_clear (buf);

		tmp = ASE_STR_PTR(buf) + ASE_STR_LEN(buf);

		/* extend the buffer */
		if (ase_str_nccat (
			buf, ASE_T(' '), rlen) == (ase_size_t)-1)
		{
			ase_awk_setrunerror (
				run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
			return ASE_NULL;
		}
	}

	t = v->val; 
	if (t < 0) t = -t;

	while (t > 0) 
	{
		tmp[--rlen] = (ase_char_t)(t % 10) + ASE_T('0');
		t /= 10;
	}

	if (v->val < 0) tmp[--rlen] = ASE_T('-');

	if (buf != ASE_NULL && !(opt & ASE_AWK_VALTOSTR_FIXED))
	{
		tmp = ASE_STR_PTR(buf);
		if (len != ASE_NULL) *len = ASE_STR_LEN(buf);
	}

	return tmp;
}

static ase_char_t* val_real_to_str (
	ase_awk_run_t* run, ase_awk_val_real_t* v,
	int opt, ase_str_t* buf, ase_size_t* len)
{
	ase_char_t* tmp;
	ase_size_t tmp_len;
	ase_str_t out, fbu;

	if (opt & ASE_AWK_VALTOSTR_PRINT)
	{
		tmp = run->global.ofmt.ptr;
		tmp_len = run->global.ofmt.len;
	}
	else
	{
		tmp = run->global.convfmt.ptr;
		tmp_len = run->global.convfmt.len;
	}

	if (ase_str_init (&out, run->awk->mmgr, 256) == ASE_NULL)
	{
		ase_awk_setrunerror (run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
		return ASE_NULL;
	}

	if (ase_str_init (&fbu, run->awk->mmgr, 256) == ASE_NULL)
	{
		ase_str_fini (&out);
		ase_awk_setrunerror (run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
		return ASE_NULL;
	}

	tmp = ase_awk_format (run, &out, &fbu, tmp, tmp_len, 
		(ase_size_t)-1, (ase_awk_nde_t*)v, &tmp_len);
	if (tmp == ASE_NULL) 
	{
		ase_str_fini (&fbu);
		ase_str_fini (&out);
		return ASE_NULL;
	}

	if (buf == ASE_NULL) 
	{
		ase_str_fini (&fbu);

		ase_str_yield (&out, ASE_NULL, 0);
		ase_str_fini (&out);

		if (len != ASE_NULL) *len = tmp_len;
	}
	else if (opt & ASE_AWK_VALTOSTR_FIXED)
	{
		ASE_ASSERT (buf != ASE_NULL && len != ASE_NULL);

		if (tmp_len >= *len)
		{
			ase_awk_setrunerror (
				run, ASE_AWK_EINVAL, 0, ASE_NULL, 0);
			*len = tmp_len + 1; /* buffer size required */
			ase_str_close (&fbu);
			ase_str_close (&out);
			return ASE_NULL;
		}

		ase_strncpy ((ase_char_t*)buf, tmp, tmp_len);
		tmp = (ase_char_t*)buf;
		*len = tmp_len;

		ase_str_fini (&fbu);
		ase_str_fini (&out);
	}
	else
	{
		if (opt & ASE_AWK_VALTOSTR_CLEAR) ase_str_clear (buf);

		if (ase_str_ncat (buf, tmp, tmp_len) == (ase_size_t)-1)
		{
			ase_str_fini (&fbu);
			ase_str_fini (&out);
			ase_awk_setrunerror (
				run, ASE_AWK_ENOMEM, 0, ASE_NULL, 0);
			return ASE_NULL;
		}

		tmp = ASE_STR_PTR(buf);
		if (len != ASE_NULL) *len = ASE_STR_LEN(buf);

		ase_str_fini (&fbu);
		ase_str_fini (&out);
	}

	return tmp;
}

int ase_awk_valtonum (
	ase_awk_run_t* run, ase_awk_val_t* v, ase_long_t* l, ase_real_t* r)
{
	if (v->type == ASE_AWK_VAL_NIL) 
	{
		*l = 0;
		return 0;
	}

	if (v->type == ASE_AWK_VAL_INT)
	{
		*l = ((ase_awk_val_int_t*)v)->val;
		return 0; /* long */
	}

	if (v->type == ASE_AWK_VAL_REAL)
	{
		*r = ((ase_awk_val_real_t*)v)->val;
		return 1; /* real */
	}

	if (v->type == ASE_AWK_VAL_STR)
	{
		return ase_awk_strtonum (run,
			((ase_awk_val_str_t*)v)->buf, 
			((ase_awk_val_str_t*)v)->len, l, r);
	}

#ifdef DEBUG_VAL
	ase_dprintf (
		ASE_T("ERROR: WRONG VALUE TYPE [%d] in ase_awk_valtonum\n"), 
		v->type);
#endif

	ase_awk_setrunerror (run, ASE_AWK_EVALTYPE, 0, ASE_NULL, 0);
	return -1; /* error */
}

int ase_awk_strtonum (
	ase_awk_run_t* run, const ase_char_t* ptr, ase_size_t len, 
	ase_long_t* l, ase_real_t* r)
{
	const ase_char_t* endptr;

	*l = ase_awk_strxtolong (run->awk, ptr, len, 0, &endptr);
	if (*endptr == ASE_T('.') ||
	    *endptr == ASE_T('E') ||
	    *endptr == ASE_T('e'))
	{
		*r = ase_awk_strxtoreal (run->awk, ptr, len, ASE_NULL);
		/* TODO: need to check if it is a valid number using 
		 *       endptr for strxtoreal? */
		return 1; /* real */
	}

	/* TODO: do should i handle strings ending with invalid number 
	 *       characters like "123xx" or "dkdkdkd"? */
	return 0; /* long */
}

#define DPRINTF run->awk->prmfns->dprintf
#define DCUSTOM run->awk->prmfns->data

static ase_map_walk_t print_pair (
	ase_map_t* map, ase_map_pair_t* pair, void* arg)
{
	ase_awk_run_t* run = (ase_awk_run_t*)arg;

	ASE_ASSERT (run == *(ase_awk_run_t**)ASE_MAP_EXTENSION(map));

	DPRINTF (DCUSTOM, ASE_T(" %.*s=>"),
		(int)ASE_MAP_KCLEN(pair), ASE_MAP_KPTR(pair));
	ase_awk_dprintval ((ase_awk_run_t*)arg, ASE_MAP_VPTR(pair));
	DPRINTF (DCUSTOM, ASE_T(" "));

	return ASE_MAP_WALK_FORWARD;
}

void ase_awk_dprintval (ase_awk_run_t* run, ase_awk_val_t* val)
{
	/* TODO: better value printing ... */

	switch (val->type)
	{
		case ASE_AWK_VAL_NIL:
			DPRINTF (DCUSTOM, ASE_T("nil"));
		       	break;

		case ASE_AWK_VAL_INT:
		#if ASE_SIZEOF_LONG_LONG > 0
			DPRINTF (DCUSTOM, ASE_T("%lld"), 
				(long long)((ase_awk_val_int_t*)val)->val);
		#elif ASE_SIZEOF___INT64 > 0
			DPRINTF (DCUSTOM, ASE_T("%I64d"), 
				(__int64)((ase_awk_val_int_t*)val)->val);
		#elif ASE_SIZEOF_LONG > 0
			DPRINTF (DCUSTOM, ASE_T("%ld"), 
				(long)((ase_awk_val_int_t*)val)->val);
		#elif ASE_SIZEOF_INT > 0
			DPRINTF (DCUSTOM, ASE_T("%d"), 
				(int)((ase_awk_val_int_t*)val)->val);
		#else
			#error unsupported size
		#endif
			break;

		case ASE_AWK_VAL_REAL:
			DPRINTF (DCUSTOM, ASE_T("%Lf"), 
				(long double)((ase_awk_val_real_t*)val)->val);
			break;

		case ASE_AWK_VAL_STR:
			DPRINTF (DCUSTOM, ASE_T("%s"), ((ase_awk_val_str_t*)val)->buf);
			break;

		case ASE_AWK_VAL_REX:
			DPRINTF (DCUSTOM, ASE_T("REX[%s]"), ((ase_awk_val_rex_t*)val)->buf);
			break;

		case ASE_AWK_VAL_MAP:
			DPRINTF (DCUSTOM, ASE_T("MAP["));
			ase_map_walk (((ase_awk_val_map_t*)val)->map, print_pair, run);
			DPRINTF (DCUSTOM, ASE_T("]"));
			break;
	
		case ASE_AWK_VAL_REF:
			DPRINTF (DCUSTOM, ASE_T("REF[id=%d,val="), ((ase_awk_val_ref_t*)val)->id);
			ase_awk_dprintval (run, *((ase_awk_val_ref_t*)val)->adr);
			DPRINTF (DCUSTOM, ASE_T("]"));
			break;

		default:
			DPRINTF (DCUSTOM, ASE_T("**** INTERNAL ERROR - INVALID VALUE TYPE ****\n"));
	}
}