/*
 * $Id: tab.c,v 1.18 2006-09-25 06:17:19 bacon Exp $
 */

#include <xp/awk/awk_i.h>

#ifndef XP_AWK_STAND_ALONE
#include <xp/bas/assert.h>
#endif

xp_awk_tab_t* xp_awk_tab_open (xp_awk_tab_t* tab, xp_awk_t* awk)
{
	if (tab == XP_NULL) 
	{
		tab = (xp_awk_tab_t*) XP_AWK_MALLOC (
			awk, xp_sizeof(xp_awk_tab_t));
		if (tab == XP_NULL) return XP_NULL;
		tab->__dynamic = xp_true;
	}
	else tab->__dynamic = xp_false;

	tab->awk = awk;
	tab->buf = XP_NULL;
	tab->size = 0;
	tab->capa = 0;

	return tab;
}

void xp_awk_tab_close (xp_awk_tab_t* tab)
{
	xp_awk_tab_clear (tab);
	if (tab->buf != XP_NULL) 
	{
		XP_AWK_FREE (tab->awk, tab->buf);
		tab->buf = XP_NULL;
		tab->capa = 0;
	}

	if (tab->__dynamic) XP_AWK_FREE (tab->awk, tab);
}

xp_size_t xp_awk_tab_getsize (xp_awk_tab_t* tab)
{
	return tab->size;
}

xp_size_t xp_awk_tab_getcapa (xp_awk_tab_t* tab)
{
	return tab->capa;
}

xp_awk_tab_t* xp_awk_tab_setcapa (xp_awk_tab_t* tab, xp_size_t capa)
{
	void* tmp;

	if (tab->size > capa) 
	{
		xp_awk_tab_remove (tab, capa, tab->size - capa);
		xp_assert (tab->size <= capa);
	}

	if (capa > 0) 
	{
		if (tab->awk->syscas->realloc != XP_NULL)
		{
			tmp = XP_AWK_REALLOC (tab->awk, 
				tab->buf, xp_sizeof(*tab->buf) * capa);
			if (tmp == XP_NULL) return XP_NULL;
		}
		else
		{
			tmp = XP_AWK_MALLOC (
				tab->awk, xp_sizeof(*tab->buf) * capa);
			if (tmp == XP_NULL) return XP_NULL;
			if (tab->buf != XP_NULL) 
			{
				xp_size_t x;
				x = (capa > tab->capa)? tab->capa: capa;
				XP_AWK_MEMCPY (
					tab->awk, tmp, tab->buf, 
					xp_sizeof(*tab->buf) * x);
				XP_AWK_FREE (tab->awk, tab->buf);
			}
		}
	}
	else 
	{
		if (tab->buf != XP_NULL) XP_AWK_FREE (tab->awk, tab->buf);
		tmp = XP_NULL;
	}

	tab->buf = tmp;
	tab->capa = capa;
	
	return tab;
}

void xp_awk_tab_clear (xp_awk_tab_t* tab)
{
	xp_size_t i;

	xp_assert (tab != XP_NULL);

	for (i = 0; i < tab->size; i++) 
	{
		XP_AWK_FREE (tab->awk, tab->buf[i].name);
		tab->buf[i].name = XP_NULL;
		tab->buf[i].name_len = 0;
	}

	tab->size = 0;
}


xp_size_t xp_awk_tab_insert (
	xp_awk_tab_t* tab, xp_size_t index, 
	const xp_char_t* str, xp_size_t len)
{
	xp_size_t i;
	xp_char_t* str_dup;

	str_dup = xp_awk_strxdup (tab->awk, str, len);
	if (str_dup == XP_NULL) return (xp_size_t)-1;

	if (index >= tab->capa) 
	{
		xp_size_t capa;

		if (tab->capa <= 0) capa = (index + 1);
		else 
		{
			do { capa = tab->capa * 2; } while (index >= capa);
		}

		if (xp_awk_tab_setcapa(tab,capa) == XP_NULL) 
		{
			XP_AWK_FREE (tab->awk, str_dup);
			return (xp_size_t)-1;
		}
	}

	for (i = tab->size; i > index; i--) tab->buf[i] = tab->buf[i-1];
	tab->buf[index].name = str_dup;
	tab->buf[index].name_len = len;

	if (index > tab->size) tab->size = index + 1;
	else tab->size++;

	return index;
}

xp_size_t xp_awk_tab_remove (
	xp_awk_tab_t* tab, xp_size_t index, xp_size_t count)
{
	xp_size_t i, j, k;

	if (index >= tab->size) return 0;
	if (count > tab->size - index) count = tab->size - index;

	i = index;
	j = index + count;
	k = index + count;

	while (i < k) 
	{
		XP_AWK_FREE (tab->awk, tab->buf[i].name);	

		if (j >= tab->size) 
		{
			tab->buf[i].name = XP_NULL;
			tab->buf[i].name_len = 0; 
			i++;
		}
		else
		{
			tab->buf[i].name = tab->buf[j].name;
			tab->buf[i].name_len = tab->buf[j].name_len;
			i++; j++;		
		}
	}

	tab->size -= count;
	return count;
}

xp_size_t xp_awk_tab_add (
	xp_awk_tab_t* tab, const xp_char_t* str, xp_size_t len)
{
	return xp_awk_tab_insert (tab, tab->size, str, len);
}

xp_size_t xp_awk_tab_find (
	xp_awk_tab_t* tab, xp_size_t index, 
	const xp_char_t* str, xp_size_t len)
{
	xp_size_t i;

	for (i = index; i < tab->size; i++) 
	{
		if (xp_awk_strxncmp (
			tab->buf[i].name, tab->buf[i].name_len, 
			str, len) == 0) return i;
	}

	return (xp_size_t)-1;
}

xp_size_t xp_awk_tab_rfind (
	xp_awk_tab_t* tab, xp_size_t index, 
	const xp_char_t* str, xp_size_t len)
{
	xp_size_t i;

	if (index >= tab->size) return (xp_size_t)-1;

	for (i = index + 1; i-- > 0; ) 
	{
		if (xp_awk_strxncmp (
			tab->buf[i].name, tab->buf[i].name_len, 
			str, len) == 0) return i;
	}

	return (xp_size_t)-1;
}

xp_size_t xp_awk_tab_rrfind (
	xp_awk_tab_t* tab, xp_size_t index,
	const xp_char_t* str, xp_size_t len)
{
	xp_size_t i;

	if (index >= tab->size) return (xp_size_t)-1;

	for (i = tab->size - index; i-- > 0; ) 
	{
		if (xp_awk_strxncmp (
			tab->buf[i].name, tab->buf[i].name_len, 
			str, len) == 0) return i;
	}

	return (xp_size_t)-1;
}