/*-
 * Copyright (c) 1986, 1988, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)subr_prf.c	8.3 (Berkeley) 1/21/94
 * $FreeBSD: src/lib/libstand/printf.c,v 1.4 1999/12/27 08:45:14 peter Exp $
 * $DragonFly: src/lib/libstand/printf.c,v 1.6 2005/12/11 02:27:26 swildner Exp $
 */

/*
 * Standaloneified version of the FreeBSD kernel printf family.
 */

#include <sys/types.h>
#include <string.h>
#include "stand.h"

/*
 * Note that stdarg.h and the ANSI style va_start macro is used for both
 * ANSI and traditional C compilers.
 */
#include <stdarg.h>

struct snprintf_arg {
	char	*buf;
	size_t	remain;
};

static char	*ksprintn(u_long, int, int *);
static int	kvprintf(const char *, void (*)(int, void *), void *, int,
			 va_list);
static void	putchar_wrapper(int, void *);
static void	snprintf_func(int, void *);

static void
putchar_wrapper(int ch, void *arg __unused)
{
	putchar(ch);
}

int
printf(const char *fmt, ...)
{
	va_list ap;
	int retval;

	va_start(ap, fmt);
	retval = kvprintf(fmt, putchar_wrapper, NULL, 10, ap);
	va_end(ap);
	return retval;
}

void
vprintf(const char *fmt, va_list ap)
{

	kvprintf(fmt, putchar_wrapper, NULL, 10, ap);
}

int
sprintf(char *buf, const char *cfmt, ...)
{
	int retval;
	va_list ap;

	va_start(ap, cfmt);
	retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
	buf[retval] = '\0';
	va_end(ap);
	return retval;
}

void
vsprintf(char *buf, const char *cfmt, va_list ap)
{
	int	retval;
	
	retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
	buf[retval] = '\0';
}

int
snprintf(char *buf, size_t size, const char *cfmt, ...)
{
	int retval;
	va_list ap;

	va_start(ap, cfmt);
	retval = vsnprintf(buf, size, cfmt, ap);
	__va_end(ap);
	return(retval);
}

int
vsnprintf(char *buf, size_t size, const char *cfmt, va_list ap)
{
	struct snprintf_arg info;
	int retval;

	info.buf = buf;
	info.remain = size;
	retval = kvprintf(cfmt, snprintf_func, &info, 10, ap);
	if (info.remain >= 1)
		*info.buf++ = '\0';
	return(retval);
}

static void
snprintf_func(int ch, void *arg)
{
	struct snprintf_arg * const info = arg;

	if (info->remain >= 2) {
		*info->buf++ = ch;
		info->remain--;
	}
}

/*
 * Put a number (base <= 16) in a buffer in reverse order; return an
 * optional length and a pointer to the NULL terminated (preceded?)
 * buffer.
 */
static char *
ksprintn(u_long ul, int base, int *lenp)
{					/* A long in base 8, plus NULL. */
	static char buf[sizeof(long) * NBBY / 3 + 2];
	char *p;

	p = buf;
	do {
		*++p = hex2ascii(ul % base);
	} while (ul /= base);
	if (lenp)
		*lenp = p - buf;
	return (p);
}

/*
 * Scaled down version of printf(3).
 *
 * Two additional formats:
 *
 * The format %b is supported to decode error registers.
 * Its usage is:
 *
 *	printf("reg=%b\n", regval, "<base><arg>*");
 *
 * where <base> is the output base expressed as a control character, e.g.
 * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
 * the first of which gives the bit number to be inspected (origin 1), and
 * the next characters (up to a control character, i.e. a character <= 32),
 * give the name of the register.  Thus:
 *
 *	kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
 *
 * would produce output:
 *
 *	reg=3<BITTWO,BITONE>
 *
 * XXX:  %D  -- Hexdump, takes pointer and separator string:
 *		("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
 *		("%*D", len, ptr, " " -> XX XX XX XX ...
 */
static int
kvprintf(char const *fmt, void (*func)(int, void *), void *arg, int radix,
	 va_list ap)
{
#define PCHAR(c) {int cc=(c); if (func) (*func)(cc, arg); else *d++ = cc; retval++; }
	char *p, *q, *d;
	u_char *up;
	int ch, n;
	u_long ul;
	int base, lflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
	int dwidth;
	char padc;
	int retval = 0;

	if (!func)
		d = (char *) arg;
	else
		d = NULL;

	if (fmt == NULL)
		fmt = "(fmt null)\n";

	if (radix < 2 || radix > 36)
		radix = 10;

	for (;;) {
		padc = ' ';
		width = 0;
		while ((ch = (u_char)*fmt++) != '%') {
			if (ch == '\0') 
				return retval;
			PCHAR(ch);
		}
		lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
		sign = 0; dot = 0; dwidth = 0;
reswitch:	switch (ch = (u_char)*fmt++) {
		case '.':
			dot = 1;
			goto reswitch;
		case '#':
			sharpflag = 1;
			goto reswitch;
		case '+':
			sign = 1;
			goto reswitch;
		case '-':
			ladjust = 1;
			goto reswitch;
		case '%':
			PCHAR(ch);
			break;
		case '*':
			if (!dot) {
				width = va_arg(ap, int);
				if (width < 0) {
					ladjust = !ladjust;
					width = -width;
				}
			} else {
				dwidth = va_arg(ap, int);
			}
			goto reswitch;
		case '0':
			if (!dot) {
				padc = '0';
				goto reswitch;
			}
		case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
				for (n = 0;; ++fmt) {
					n = n * 10 + ch - '0';
					ch = *fmt;
					if (ch < '0' || ch > '9')
						break;
				}
			if (dot)
				dwidth = n;
			else
				width = n;
			goto reswitch;
		case 'b':
			ul = va_arg(ap, int);
			p = va_arg(ap, char *);
			for (q = ksprintn(ul, *p++, NULL); *q;)
				PCHAR(*q--);

			if (!ul)
				break;

			for (tmp = 0; *p;) {
				n = *p++;
				if (ul & (1 << (n - 1))) {
					PCHAR(tmp ? ',' : '<');
					for (; (n = *p) > ' '; ++p)
						PCHAR(n);
					tmp = 1;
				} else
					for (; *p > ' '; ++p)
						continue;
			}
			if (tmp)
				PCHAR('>');
			break;
		case 'c':
			PCHAR(va_arg(ap, int));
			break;
		case 'D':
			up = va_arg(ap, u_char *);
			p = va_arg(ap, char *);
			if (!width)
				width = 16;
			while(width--) {
				PCHAR(hex2ascii(*up >> 4));
				PCHAR(hex2ascii(*up & 0x0f));
				up++;
				if (width)
					for (q=p;*q;q++)
						PCHAR(*q);
			}
			break;
		case 'd':
			ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
			sign = 1;
			base = 10;
			goto number;
		case 'l':
			lflag = 1;
			goto reswitch;
		case 'n':
			ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
			base = radix;
			goto number;
		case 'o':
			ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
			base = 8;
			goto number;
		case 'p':
			ul = (u_long)va_arg(ap, void *);
			base = 16;
			sharpflag = 1;
			goto number;
		case 's':
			p = va_arg(ap, char *);
			if (p == NULL)
				p = "(null)";
			if (!dot)
				n = strlen (p);
			else
				for (n = 0; n < dwidth && p[n]; n++)
					continue;

			width -= n;

			if (!ladjust && width > 0)
				while (width--)
					PCHAR(padc);
			while (n--)
				PCHAR(*p++);
			if (ladjust && width > 0)
				while (width--)
					PCHAR(padc);
			break;
		case 'u':
			ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
			base = 10;
			goto number;
		case 'x':
			ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
			base = 16;
number:			if (sign && (long)ul < 0L) {
				neg = 1;
				ul = -(long)ul;
			}
			p = ksprintn(ul, base, &tmp);
			if (sharpflag && ul != 0) {
				if (base == 8)
					tmp++;
				else if (base == 16)
					tmp += 2;
			}
			if (neg)
				tmp++;

			if (!ladjust && width && (width -= tmp) > 0)
				while (width--)
					PCHAR(padc);
			if (neg)
				PCHAR('-');
			if (sharpflag && ul != 0) {
				if (base == 8) {
					PCHAR('0');
				} else if (base == 16) {
					PCHAR('0');
					PCHAR('x');
				}
			}

			while (*p)
				PCHAR(*p--);

			if (ladjust && width && (width -= tmp) > 0)
				while (width--)
					PCHAR(padc);

			break;
		default:
			PCHAR('%');
			if (lflag)
				PCHAR('l');
			PCHAR(ch);
			break;
		}
	}
#undef PCHAR
}