/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org>
 * 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 <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>

#include "libc_private.h"
#include "thr_private.h"

static void     pchar(int fd, char c);
static void     pstr(int fd, const char *s);

/*
 * Write formatted output to stdout, in a thread-safe manner.
 *
 * Recognises the following conversions:
 *      %c      -> char
 *      %d      -> signed int (base 10)
 *      %s      -> string
 *      %u      -> unsigned int (base 10)
 *      %x      -> unsigned int (base 16)
 *      %p      -> unsigned int (base 16)
 */
void
_thread_printf(int fd, const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        _thread_vprintf(fd, fmt, ap);
        va_end(ap);
}

void
_thread_vprintf(int fd, const char *fmt, va_list ap)
{
        static const char digits[16] __nonstring = "0123456789abcdef";
        char buf[20];
        char *s;
        unsigned long r, u;
        int c;
        long d;
        int islong, isalt;

        while ((c = *fmt++)) {
                isalt = 0;
                islong = 0;
                if (c == '%') {
next:                   c = *fmt++;
                        if (c == '\0')
                                return;
                        switch (c) {
                        case '#':
                                isalt = 1;
                                goto next;
                        case 'c':
                                pchar(fd, va_arg(ap, int));
                                continue;
                        case 's':
                                pstr(fd, va_arg(ap, char *));
                                continue;
                        case 'l':
                                islong = 1;
                                goto next;
                        case 'p':
                                pstr(fd, "0x");
                                islong = 1;
                                /* FALLTHROUGH */
                        case 'd':
                        case 'u':
                        case 'x':
                                if (c == 'x' && isalt)
                                        pstr(fd, "0x");
                                r = ((c == 'u') || (c == 'd')) ? 10 : 16;
                                if (c == 'd') {
                                        if (islong)
                                                d = va_arg(ap, unsigned long);
                                        else
                                                d = va_arg(ap, unsigned);
                                        if (d < 0) {
                                                pchar(fd, '-');
                                                u = (unsigned long)(d * -1);
                                        } else
                                                u = (unsigned long)d;
                                } else {
                                        if (islong)
                                                u = va_arg(ap, unsigned long);
                                        else
                                                u = va_arg(ap, unsigned);
                                }
                                s = buf;
                                do {
                                        *s++ = digits[u % r];
                                } while (u /= r);
                                while (--s >= buf)
                                        pchar(fd, *s);
                                continue;
                        }
                }
                pchar(fd, c);
        }
}

/*
 * Write a single character to stdout, in a thread-safe manner.
 */
static void
pchar(int fd, char c)
{

        __sys_write(fd, &c, 1);
}

/*
 * Write a string to stdout, in a thread-safe manner.
 */
static void
pstr(int fd, const char *s)
{

        __sys_write(fd, s, strlen(s));
}