xref: /freebsd/lib/libc/stdio/xprintf_hexdump.c (revision b3e7694832e81d7a904a10f525f8797b753bf0d3)

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005 Poul-Henning Kamp
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */

#include <namespace.h>
#include <stdio.h>
#include <wchar.h>
#include <stdint.h>
#include <assert.h>
#include <sys/time.h>
#include "printf.h"

int
__printf_arginfo_hexdump(const struct printf_info *pi, size_t n, int *argt)
{

	assert(n >= 2);
	argt[0] = PA_POINTER;
	argt[1] = PA_INT;
	return (2);
}

int
__printf_render_hexdump(struct __printf_io *io, const struct printf_info *pi, const void *const *arg)
{
	unsigned char *p;
	int i;
	unsigned u, l, j, a;
	char buf[100], *q;
	int ret;

	if (pi->width > 0 && pi->width < 16)
		l = pi->width;
	else
		l = 16;
	p = *((unsigned char **)arg[0]);
	i = *((int *)arg[1]);
	if (i < 0)
		i = 0;
	u = i;

	ret = 0;
	a = 0;
	while (u > 0) {
		q = buf;
		if (pi->showsign)
			q += sprintf(q, " %04x", a);
		for (j = 0; j < l && j < u; j++)
			q += sprintf(q, " %02x", p[j]);
		if (pi->alt) {
			for (; j < l; j++)
				q += sprintf(q, "   ");
			q += sprintf(q, "  |");
			for (j = 0; j < l && j < u; j++) {
				if (p[j] < ' ' || p[j] > '~')
					*q++ = '.';
				else
					*q++ = p[j];
			}
			for (; j < l; j++)
				*q++ = ' ';
			*q++ = '|';
		}
		if (l < u)
			j = l;
		else
			j = u;
		p += j;
		u -= j;
		a += j;
		if (u > 0)
			*q++ = '\n';
		ret += __printf_puts(io, buf + 1, q - (buf + 1));
		__printf_flush(io);
	}
	return (ret);
}