/*
 * $Id: stdio.c 341 2008-08-20 10:58:19Z baconevi $
 *
 * {License}
 */

#include <ase/utl/stdio.h>
#include "../cmn/chr.h"

#include <wchar.h>
#include <stdlib.h>
#include <limits.h>

#ifndef PATH_MAX
#define PATH_MAX 2048
#endif

#if defined(_WIN32)

int ase_vsprintf (ase_char_t* buf, size_t size, const ase_char_t* fmt, va_list ap)
{
	int n;

	n = _vsntprintf (buf, size, fmt, ap);
	if (n < 0 || (size_t)n >= size)
	{
		if (size > 0) buf[size-1] = ASE_T('\0');
		n = -1;
	}

	return n;
}

int ase_sprintf (ase_char_t* buf, size_t size, const ase_char_t* fmt, ...)
{
	int n;
	va_list ap;

	va_start (ap, fmt);
	n = ase_vsprintf (buf, size, fmt, ap);
	va_end (ap);
	return n;
}

#else

static ase_char_t* __adjust_format (const ase_char_t* format);

int ase_vfprintf (ASE_FILE *stream, const ase_char_t* fmt, va_list ap)
{
	int n;
	ase_char_t* nf = __adjust_format (fmt);
	if (nf == NULL) return -1;

#ifdef ASE_CHAR_IS_MCHAR
	n = vfprintf (stream, nf, ap);
#else
	n = vfwprintf (stream, nf, ap);
#endif
	free (nf);
	return n;
}

int ase_vprintf (const ase_char_t* fmt, va_list ap)
{
	return ase_vfprintf (stdout, fmt, ap);
}

int ase_fprintf (ASE_FILE* file, const ase_char_t* fmt, ...)
{
	int n;
	va_list ap;

	va_start (ap, fmt);
	n = ase_vfprintf (file, fmt, ap);
	va_end (ap);
	return n;
}

int ase_printf (const ase_char_t* fmt, ...)
{
	int n;
	va_list ap;

	va_start (ap, fmt);
	n = ase_vprintf (fmt, ap);
	va_end (ap);
	return n;
}

int ase_vsprintf (ase_char_t* buf, size_t size, const ase_char_t* fmt, va_list ap)
{
	int n;
	ase_char_t* nf = __adjust_format (fmt);
	if (nf == NULL) return -1;

#if defined(ASE_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
	if (n < 0 || (size_t)n >= size)
	{
		if (size > 0) buf[size-1] = ASE_T('\0');
		n = -1;
	}

	free (nf);
	return n;
}

int ase_sprintf (ase_char_t* buf, size_t size, const ase_char_t* fmt, ...)
{
	int n;
	va_list ap;

	va_start (ap, fmt);
	n = ase_vsprintf (buf, size, fmt, ap);
	va_end (ap);
	return n;
}

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

#define ADDC(buf,c) \
	do { \
		if (buf.len >= buf.cap) \
		{ \
			ase_char_t* tmp; \
			tmp = (ase_char_t*)realloc ( \
				buf.ptr, sizeof(ase_char_t)*(buf.cap+256+1)); \
			if (tmp == NULL) \
			{ \
				free (buf.ptr); \
				return NULL; \
			} \
			buf.ptr = tmp; \
			buf.cap = buf.cap + 256; \
		} \
		buf.ptr[buf.len++] = c; \
	} while (0)

static ase_char_t* __adjust_format (const ase_char_t* format)
{
	const ase_char_t* fp = format;
	int modifier;
	ase_char_t ch;

	struct
	{
		ase_char_t* ptr;
		ase_size_t  len;
		ase_size_t  cap;
	} buf;

	buf.len = 0;
	buf.cap = 256;
#if (defined(vms) || defined(__vms)) && (ASE_SIZEOF_VOID_P >= 8)
	buf.ptr = (ase_char_t*) _malloc32 (sizeof(ase_char_t)*(buf.cap+1));
#else
	buf.ptr = (ase_char_t*) malloc (sizeof(ase_char_t)*(buf.cap+1));
#endif
	if (buf.ptr == NULL) return NULL;

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

		if (*fp == ASE_T('\0')) break;

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

		ch = *fp++;

		/* flags */
		while (1)
		{
			if (ch == ASE_T(' ') || ch == ASE_T('+') ||
			    ch == ASE_T('-') || ch == ASE_T('#')) 
			{
				ADDC (buf, ch);
				ch = *fp++;
			}
			else 
			{
				if (ch == ASE_T('0')) 
				{
					ADDC (buf, ch);
					ch = *fp++; 
				}

				break;
			}
		}

		/* check the width */
		if (ch == ASE_T('*')) 
		{
			ADDC (buf, ch);
			ch = *fp++;
		}
		else 
		{
			while (ASE_ISDIGIT(ch)) 
			{
				ADDC (buf, ch);
				ch = *fp++;
			}
		}

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

			if (ch == ASE_T('*')) 
			{
				ADDC (buf, ch);
				ch = *fp++;
			}
			else 
			{
				while (ASE_ISDIGIT(ch)) 
				{
					ADDC (buf, ch);
					ch = *fp++;
				}
			}
		}

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


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

	buf.ptr[buf.len] = ASE_T('\0');

	return buf.ptr;
}

#endif

int ase_dprintf (const ase_char_t* fmt, ...)
{
	int n;
	va_list ap;

	va_start (ap, fmt);
	n = ase_vfprintf (stderr, fmt, ap);
	va_end (ap);
	return n;
}

ASE_FILE* ase_fopen (const ase_char_t* path, const ase_char_t* mode)
{
#if defined(_WIN32)
	return _tfopen (path, mode);
#elif defined(ASE_CHAR_IS_MCHAR)
	return fopen (path, mode);
#else

	char path_mb[PATH_MAX + 1];
	char mode_mb[32];
	size_t n;

	n = wcstombs (path_mb, path, ASE_COUNTOF(path_mb));
	if (n == (size_t)-1) return NULL;
	if (n == ASE_COUNTOF(path_mb)) path_mb[ASE_COUNTOF(path_mb)-1] = '\0';

	n = wcstombs (mode_mb, mode, ASE_COUNTOF(mode_mb));
	if (n == (size_t)-1) return NULL;
	if (n == ASE_COUNTOF(mode_mb)) path_mb[ASE_COUNTOF(mode_mb)-1] = '\0';

	return fopen (path_mb, mode_mb);
#endif
}

ASE_FILE* ase_popen (const ase_char_t* cmd, const ase_char_t* mode)
{
#if defined(__SPU__)
	/* popen is not available */
	#warning ############################################
	#warning ase_popen is NOT SUPPORTED in this platform.
	#warning #############################################
	return ASE_NULL;
#elif defined(_WIN32) 
	#if defined(__DMC__)
		/* TODO: implement this for DMC */
		#warning ############################################
		#warning ase_popen is NOT SUPPORTED in this platform.
		#warning #############################################
		return ASE_NULL;
	#else
		return _tpopen (cmd, mode);
	#endif
#elif defined(ASE_CHAR_IS_MCHAR)
	return popen (cmd, mode);
#else
	char cmd_mb[PATH_MAX + 1];
	char mode_mb[32];
	size_t n;

	n = wcstombs (cmd_mb, cmd, ASE_COUNTOF(cmd_mb));
	if (n == (size_t)-1) return NULL;
	if (n == ASE_COUNTOF(cmd_mb)) cmd_mb[ASE_COUNTOF(cmd_mb)-1] = '\0';

	n = wcstombs (mode_mb, mode, ASE_COUNTOF(mode_mb));
	if (n == (size_t)-1) return NULL;
	if (n == ASE_COUNTOF(mode_mb)) cmd_mb[ASE_COUNTOF(mode_mb)-1] = '\0';

	return popen (cmd_mb, mode_mb);
#endif
}

static int isnl (const ase_char_t* ptr, ase_size_t len, void* delim)
{
	return (ptr[len-1] == *(ase_char_t*)delim)? 1: 0;
}

ase_ssize_t ase_getline (ase_char_t **buf, ase_size_t *n, ASE_FILE *fp)
{
	ase_char_t nl = ASE_T('\n');
	return ase_getdelim (buf, n, isnl, &nl, fp);
}

ase_ssize_t ase_getdelim (
	ase_char_t **buf, ase_size_t *n, 
	ase_getdelim_t fn, void* fnarg, ASE_FILE *fp)
{
	ase_char_t* b;
	ase_size_t capa;
	ase_size_t len = 0;
	int x;

	ASE_ASSERT (buf != ASE_NULL);
	ASE_ASSERT (n != ASE_NULL);

	b = *buf;
	capa = *n;

	if (b == ASE_NULL)
	{
		capa = 256;
#if (defined(vms) || defined(__vms)) && (ASE_SIZEOF_VOID_P >= 8)
		b = (ase_char_t*) _malloc32 (sizeof(ase_char_t)*(capa+1));
#else
		b = (ase_char_t*) malloc (sizeof(ase_char_t)*(capa+1));
#endif
		if (b == ASE_NULL) return -2;
	}

	if (ase_feof(fp))
	{
		len = (ase_size_t)-1;
		goto exit_task;
	}

	while (1)
	{
		ase_cint_t c = ase_fgetc(fp);
		if (c == ASE_CHAR_EOF)
		{
			if (ase_ferror(fp)) 
			{
				len = (ase_size_t)-2;
				goto exit_task;
			}
			if (len == 0)
			{
				len = (ase_size_t)-1;
				goto exit_task;
			}

			break;
		}

		if (len+1 >= capa)
		{
			ase_size_t ncapa = capa + 256;
			ase_char_t* nb;

			nb = realloc (b, ncapa*sizeof(ase_char_t));
			if (nb == ASE_NULL)
			{
				len = (ase_size_t)-2;
				goto exit_task;
			}

			b = nb;
			capa = ncapa;
		}

		b[len++] = c;

		x = fn (b, len, fnarg);
		if (x < 0)
		{
			len = (ase_size_t)-3;
			goto exit_task;
		}
		if (x > 0) break;
	}
	b[len] = ASE_T('\0');

exit_task:
	*buf = b;
	*n = capa;

	return (ase_ssize_t)len;
}