/*      $OpenBSD: printf.c,v 1.29 2019/05/11 16:56:47 deraadt Exp $     */
/*      $NetBSD: printf.c,v 1.10 1996/11/30 04:19:21 gwr Exp $  */

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  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.
 * 3. 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.
 *
 *      @(#)printf.c    8.1 (Berkeley) 6/11/93
 */

/*
 * Scaled down version of printf(3).
 *
 * One additional format:
 *
 * 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:
 *
 *      printf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
 *
 * would produce output:
 *
 *      reg=3<BITTWO,BITONE>
 */

#include <sys/types.h>
#include <sys/stdarg.h>

#include "stand.h"

/*
 * macros for converting digits to letters and vice versa
 */
#define to_digit(c)     ((c) - '0')
#define is_digit(c)     ((unsigned)to_digit(c) <= 9)
#define to_char(n)      ((n) + '0')

void kprintn(void (*)(int), u_long, int, int, char);
#ifdef LIBSA_LONGLONG_PRINTF
void kprintn64(void (*)(int), u_int64_t, int, int, char);
#endif
void kdoprnt(void (*)(int), const char *, va_list);

const char hexdig[] = "0123456789abcdef";

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

        va_start(ap, fmt);
        kdoprnt(putchar, fmt, ap);
        va_end(ap);
}

void
vprintf(const char *fmt, va_list ap)
{
        kdoprnt(putchar, fmt, ap);
}

void
kdoprnt(void (*put)(int), const char *fmt, va_list ap)
{
#ifdef LIBSA_LONGLONG_PRINTF
        u_int64_t ull;
#endif
        unsigned long ul;
        int ch, lflag, width, n;
        char *p, padchar;

        for (;;) {
                while ((ch = *fmt++) != '%') {
                        if (ch == '\0')
                                return;
                        put(ch);
                }
                lflag = 0;
                padchar = ' ';
                width = 0;
rflag:          ch = *fmt++;
reswitch:       switch (ch) {
                case '0':
                        /*
                         * ``Note that 0 is taken as a flag, not as the
                         * beginning of a field width.''
                         *      -- ANSI X3J11
                         */
                        padchar = '0';
                        goto rflag;
                case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                        n = 0;
                        do {
                                n = 10 * n + to_digit(ch);
                                ch = *fmt++;
                        } while (is_digit(ch));
                        width = n;
                        goto reswitch;
                case 'l':
                        lflag++;
                        goto rflag;
                case 'b':
                {
                        int set, n;

                        ul = va_arg(ap, int);
                        p = va_arg(ap, char *);
                        kprintn(put, ul, *p++, width, padchar);

                        if (!ul)
                                break;

                        for (set = 0; (n = *p++);) {
                                if (ul & (1 << (n - 1))) {
                                        put(set ? ',' : '<');
                                        for (; (n = *p) > ' '; ++p)
                                                put(n);
                                        set = 1;
                                } else
                                        for (; *p > ' '; ++p)
                                                ;
                        }
                        if (set)
                                put('>');
                }
                        break;
                case 'c':
                        ch = va_arg(ap, int);
                        put(ch & 0x7f);
                        break;
                case 's':
                        p = va_arg(ap, char *);
                        while ((ch = *p++))
                                put(ch);
                        break;
                case 'd':
#ifdef LIBSA_LONGLONG_PRINTF
                        if (lflag > 1) {
                                ull = va_arg(ap, int64_t);
                                if ((int64_t)ull < 0) {
                                        put('-');
                                        ull = -(int64_t)ull;
                                }
                                kprintn64(put, ull, 10, width, padchar);
                                break;
                        } 
#endif
                        ul = lflag ?
                            va_arg(ap, long) : va_arg(ap, int);
                        if ((long)ul < 0) {
                                put('-');
                                ul = -(long)ul;
                        }
                        kprintn(put, ul, 10, width, padchar);
                        break;
                case 'o':
#ifdef LIBSA_LONGLONG_PRINTF
                        if (lflag > 1) {
                                ull = va_arg(ap, u_int64_t);
                                kprintn64(put, ull, 8, width, padchar);
                                break;
                        } 
#endif
                        ul = lflag ?
                            va_arg(ap, u_long) : va_arg(ap, u_int);
                        kprintn(put, ul, 8, width, padchar);
                        break;
                case 'u':
#ifdef LIBSA_LONGLONG_PRINTF
                        if (lflag > 1) {
                                ull = va_arg(ap, u_int64_t);
                                kprintn64(put, ull, 10, width, padchar);
                                break;
                        } 
#endif
                        ul = lflag ?
                            va_arg(ap, u_long) : va_arg(ap, u_int);
                        kprintn(put, ul, 10, width, padchar);
                        break;
                case 'p':
                        put('0');
                        put('x');
                        lflag += sizeof(void *)==sizeof(u_long)? 1 : 0;
                case 'x':
#ifdef LIBSA_LONGLONG_PRINTF
                        if (lflag > 1) {
                                ull = va_arg(ap, u_int64_t);
                                kprintn64(put, ull, 16, width, padchar);
                                break;
                        }
#else
                        if (lflag > 1) {
                                /* hold an int64_t in base 16 */
                                char *p, buf[(sizeof(u_int64_t) * NBBY / 4) + 1];
                                u_int64_t ull;

                                ull = va_arg(ap, u_int64_t);
                                p = buf;
                                do {
                                        *p++ = hexdig[ull & 15];
                                } while (ull >>= 4);
                                while ((p - buf) < width &&
                                    (p - buf) < sizeof(buf)) {
                                        *p++ = padchar;
                                }
                                do {
                                        put(*--p);
                                } while (p > buf);
                                break;
                        }
#endif
                        ul = lflag ?
                            va_arg(ap, u_long) : va_arg(ap, u_int);
                        kprintn(put, ul, 16, width, padchar);
                        break;
                default:
                        put('%');
#ifdef LIBSA_LONGLONG_PRINTF
                        while (--lflag)
#else
                        if (lflag)
#endif
                                put('l');
                        put(ch);
                }
        }
}

void
kprintn(void (*put)(int), unsigned long ul, int base, int width, char padchar)
{
        /* hold a long in base 8 */
        char *p, buf[(sizeof(long) * NBBY / 3) + 1];

        p = buf;
        do {
                *p++ = hexdig[ul % base];
        } while (ul /= base);
        while ((p - buf) < width && (p - buf) < sizeof(buf)) {
                *p++ = padchar;
        }
        do {
                put(*--p);
        } while (p > buf);
}

#ifdef LIBSA_LONGLONG_PRINTF
void
kprintn64(void (*put)(int), u_int64_t ull, int base, int width, char padchar)
{
        /* hold an int64_t in base 8 */
        char *p, buf[(sizeof(u_int64_t) * NBBY / 3) + 1];

        p = buf;
        do {
                *p++ = hexdig[ull % base];
        } while (ull /= base);
        while ((p - buf) < width && (p - buf) < sizeof(buf)) {
                *p++ = padchar;
        }
        do {
                put(*--p);
        } while (p > buf);
}
#endif

int donottwiddle = 0;

void
twiddle(void)
{
        static int pos;

        if (!donottwiddle) {
                putchar("|/-\\"[pos++ & 3]);
                putchar('\b');
        }
}