/*
 * $Id: sa.c,v 1.33 2006-09-01 03:44:16 bacon Exp $
 */

#include <xp/awk/awk_i.h>

#ifdef XP_AWK_STAND_ALONE

static xp_char_t* __adjust_format (xp_awk_t* awk, const xp_char_t* format);

xp_size_t xp_strlen (const xp_char_t* str)
{
	const xp_char_t* p = str;
	while (*p != XP_T('\0')) p++;
	return p - str;
}

xp_size_t xp_strcpy (xp_char_t* buf, const xp_char_t* str)
{
	xp_char_t* org = buf;
	while ((*buf++ = *str++) != XP_T('\0'));
	return buf - org - 1;
}

xp_size_t xp_strncpy (xp_char_t* buf, const xp_char_t* str, xp_size_t len)
{
	const xp_char_t* end = str + len;
	while (str < end) *buf++ = *str++;
	*buf = XP_T('\0');
	return len;
}

int xp_strcmp (const xp_char_t* s1, const xp_char_t* s2)
{
	while (*s1 == *s2) 
	{
		if (*s1 == XP_C('\0')) return 0;
		s1++, s2++;
	}

	return (*s1 > *s2)? 1: -1;
}

int xp_strxncmp (
	const xp_char_t* s1, xp_size_t len1, 
	const xp_char_t* s2, xp_size_t len2)
{
	const xp_char_t* end1 = s1 + len1;
	const xp_char_t* end2 = s2 + len2;

	while (s1 < end1 && s2 < end2 && *s1 == *s2) s1++, s2++;
	if (s1 == end1 && s2 == end2) return 0;
	if (*s1 == *s2) return (s1 < end1)? 1: -1;
	return (*s1 > *s2)? 1: -1;
}

xp_char_t* xp_strxnstr (
	const xp_char_t* str, xp_size_t strsz, 
	const xp_char_t* sub, xp_size_t subsz)
{
	const xp_char_t* end, * subp;

	if (subsz == 0) return (xp_char_t*)str;
	if (strsz < subsz) return XP_NULL;
	
	end = str + strsz - subsz;
	subp = sub + subsz;

	while (str <= end) {
		const xp_char_t* x = str;
		const xp_char_t* y = sub;

		while (xp_true) {
			if (y >= subp) return (xp_char_t*)str;
			if (*x != *y) break;
			x++; y++;
		}	

		str++;
	}
		
	return XP_NULL;
}

xp_char_t* xp_strtok (const xp_char_t* s, 
	const xp_char_t* delim, xp_char_t** tok, xp_size_t* tok_len)
{
	return xp_strxntok (
		s, xp_strlen(s), delim, xp_strlen(delim), tok, tok_len);
}

xp_char_t* xp_strxtok (const xp_char_t* s, xp_size_t len,
	const xp_char_t* delim, xp_char_t** tok, xp_size_t* tok_len)
{
	return xp_strxntok (s, len, delim, xp_strlen(delim), tok, tok_len);
}

xp_char_t* xp_strxntok (
	const xp_char_t* s, xp_size_t len,
	const xp_char_t* delim, xp_size_t delim_len, 
	xp_char_t** tok, xp_size_t* tok_len)
{
	const xp_char_t* p = s, *d;
	const xp_char_t* end = s + len;	
	const xp_char_t* sp = XP_NULL, * ep = XP_NULL;
	const xp_char_t* delim_end = delim + delim_len;
	xp_char_t c; 
	int delim_mode;

	/* skip preceding space xp_char_tacters */
	while (p < end && xp_isspace(*p)) p++;

	if (delim == XP_NULL) delim_mode = 0;
	else 
	{
		delim_mode = 1;
		for (d = delim; d < delim_end; d++) 
			if (!xp_isspace(*d)) delim_mode = 2;
	}

	if (delim_mode == 0) 
	{ 
		/* when XP_NULL is given as "delim", it has an effect of cutting
		   preceding and trailing space xp_char_tacters off "s". */
		while (p < end) 
		{
			c = *p;

			if (!xp_isspace(c)) 
			{
				if (sp == XP_NULL) sp = p;
				ep = p;
			}
			p++;
		}
	}
	else if (delim_mode == 1) 
	{
		while (p < end) 
		{
			c = *p;
			if (xp_isspace(c)) break;
			if (sp == XP_NULL) sp = p;
			ep = p++;
		}
	}
	else /* if (delim_mode == 2) */ 
	{
		while (p < end) 
		{
			c = *p;
			if (xp_isspace(c)) 
			{
				p++;
				continue;
			}
			for (d = delim; d < delim_end; d++) 
			{
				if (c == *d) goto exit_loop;
			}
			if (sp == XP_NULL) sp = p;
			ep = p++;
		}
	}

exit_loop:
	if (sp == XP_NULL) 
	{
		*tok = XP_NULL;
		*tok_len = (xp_size_t)0;
	}
	else 
	{
		*tok = (xp_char_t*)sp;
		*tok_len = ep - sp + 1;
	}

	return (p >= end)? XP_NULL: ((xp_char_t*)++p);
}

int xp_awk_printf (xp_awk_t* awk, const xp_char_t* fmt, ...)
{
	int n;
	xp_va_list ap;

	xp_va_start (ap, fmt);
	n = xp_awk_vprintf (awk, fmt, ap);
	xp_va_end (ap);
	return n;
}

int xp_awk_vprintf (xp_awk_t* awk, const xp_char_t* fmt, xp_va_list ap)
{
	int n;
	xp_char_t* nf = __adjust_format (awk, fmt);
	if (nf == XP_NULL) return -1;

#ifdef XP_CHAR_IS_MCHAR
	n = vprintf (nf, ap);
#else
	n =  vwprintf (nf, ap);
#endif

	XP_AWK_FREE (awk, nf);
	return n;
}

int xp_awk_sprintf (
	xp_awk_t* awk, xp_char_t* buf, xp_size_t size, 
	const xp_char_t* fmt, ...)
{
	int n;
	xp_va_list ap;

	xp_va_start (ap, fmt);
	n = xp_awk_vsprintf (awk, buf, size, fmt, ap);
	xp_va_end (ap);
	return n;
}

int xp_awk_vsprintf (
	xp_awk_t* awk, xp_char_t* buf, xp_size_t size, 
	const xp_char_t* fmt, xp_va_list ap)
{
	int n;
	xp_char_t* nf = __adjust_format (awk, fmt);
	if (nf == XP_NULL) return -1;

#if defined(dos) || defined(__dos)
	n = vsprintf (buf, nf, ap); /* TODO: write your own vsnprintf */
#elif defined(XP_CHAR_IS_MCHAR)
	n = vsnprintf (buf, size, nf, ap);
#elif defined(_WIN32)
	n = _vsnwprintf (buf, size, nf, ap);
#else
	n = vswprintf (buf, size, nf, ap);
#endif
	XP_AWK_FREE (awk, nf);
	return n;
}

#define MOD_SHORT       1
#define MOD_LONG        2
#define MOD_LONGLONG    3

#define ADDC(str,c) \
	do { \
		if (xp_awk_str_ccat(&str, c) == (xp_size_t)-1) { \
			xp_awk_str_close (&str); \
			return XP_NULL; \
		} \
	} while (0)

static xp_char_t* __adjust_format (xp_awk_t* awk, const xp_char_t* format)
{
	const xp_char_t* fp = format;
	xp_char_t* tmp;
	xp_awk_str_t str;
	xp_char_t ch;
	int modifier;

	if (xp_awk_str_open (&str, 256, awk) == XP_NULL) return XP_NULL;

	while (*fp != XP_T('\0')) 
	{
		while (*fp != XP_T('\0') && *fp != XP_T('%')) 
		{
			ADDC (str, *fp++);
		}

		if (*fp == XP_T('\0')) break;
		xp_assert (*fp == XP_T('%'));

		ch = *fp++;	
		ADDC (str, ch); /* add % */

		ch = *fp++;

		/* flags */
		for (;;) 
		{
			if (ch == XP_T(' ') || ch == XP_T('+') ||
			    ch == XP_T('-') || ch == XP_T('#')) 
			{
				ADDC (str, ch);
			}
			else if (ch == XP_T('0')) 
			{
				ADDC (str, ch);
				ch = *fp++; 
				break;
			}
			else break;

			ch = *fp++;
		}

		/* check the width */
		if (ch == XP_T('*')) ADDC (str, ch);
		else 
		{
			while (xp_isdigit(ch)) 
			{
				ADDC (str, ch);
				ch = *fp++;
			}
		}

		/* precision */
		if (ch == XP_T('.')) 
		{
			ADDC (str, ch);
			ch = *fp++;

			if (ch == XP_T('*')) ADDC (str, ch);
			else 
			{
				while (xp_isdigit(ch)) 
				{
					ADDC (str, ch);
					ch = *fp++;
				}
			}
		}

		/* modifier */
		for (modifier = 0;;) 
		{
			if (ch == XP_T('h')) modifier = MOD_SHORT;
			else if (ch == XP_T('l')) 
			{
				modifier = (modifier == MOD_LONG)? MOD_LONGLONG: MOD_LONG;
			}
			else break;
			ch = *fp++;
		}		


		/* type */
		if (ch == XP_T('%')) ADDC (str, ch);
		else if (ch == XP_T('c') || ch == XP_T('s')) 
		{
#if !defined(XP_CHAR_IS_MCHAR) && !defined(_WIN32)
			ADDC (str, 'l');
#endif
			ADDC (str, ch);
		}
		else if (ch == XP_T('C') || ch == XP_T('S')) 
		{
#ifdef _WIN32
			ADDC (str, ch);
#else
	#ifdef XP_CHAR_IS_MCHAR
			ADDC (str, 'l');
	#endif
			ADDC (str, xp_tolower(ch));
#endif
		}
		else if (ch == XP_T('d') || ch == XP_T('i') || 
		         ch == XP_T('o') || ch == XP_T('u') || 
		         ch == XP_T('x') || ch == XP_T('X')) 
		{
			if (modifier == MOD_SHORT) 
			{
				ADDC (str, 'h');
			}
			else if (modifier == MOD_LONG) 
			{
				ADDC (str, 'l');
			}
			else if (modifier == MOD_LONGLONG) 
			{
#if defined(_WIN32) && !defined(__LCC__)
				ADDC (str, 'I');
				ADDC (str, '6');
				ADDC (str, '4');
#else
				ADDC (str, 'l');
				ADDC (str, 'l');
#endif
			}
			ADDC (str, ch);
		}
		else if (ch == XP_T('\0')) break;
		else ADDC (str, ch);
	}

	tmp = XP_AWK_STR_BUF(&str);
	xp_awk_str_forfeit (&str);
	return tmp;
}

#endif