/*      $OpenBSD: dl_printf.c,v 1.23 2024/01/22 02:08:31 deraadt 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 <stdarg.h>
#include "resolve.h"            /* for __progname */
#include "syscall.h"
#include "util.h"

static int lastfd = -1;
#define OUTBUFSIZE 128
static char outbuf[OUTBUFSIZE];
static char *outptr = outbuf;

static void kprintn(int, u_long, int);
static void kdoprnt(int, const char *, va_list);
static void _dl_flushbuf(void);

static void putcharfd(int, int);

static void
putcharfd(int c, int fd)
{
        char b = c;
        int len;

        if (fd != lastfd) {
                _dl_flushbuf();
                lastfd = fd;
        }
        *outptr++ = b;
        len = outptr - outbuf;
        if ((len >= OUTBUFSIZE) || (b == '\n') || (b == '\r')) {
                _dl_flushbuf();
        }
}

static void
_dl_flushbuf()
{
        int len = outptr - outbuf;
        if (len != 0) {
                _dl_write(lastfd, outbuf, len);
                outptr = outbuf;
        }
}

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

        va_start(ap, fmt);
        kdoprnt(2, fmt, ap);
        va_end(ap);
}

void
_dl_dprintf(int fd, const char *fmt, ...)
{
        va_list ap;

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

void
_dl_vprintf(const char *fmt, va_list ap)
{
        kdoprnt(2, fmt, ap);
}

static void
kdoprnt(int fd, const char *fmt, va_list ap)
{
        unsigned long ul;
        int lflag, ch;
        char *p;

        for (;;) {
                while ((ch = *fmt++) != '%') {
                        if (ch == '\0') {
                                _dl_flushbuf();
                                return;
                        }
                        putcharfd(ch, fd);
                }
                lflag = 0;
reswitch:
                switch (ch = *fmt++) {
                case 'l':
                        lflag = 1;
                        goto reswitch;
                case 'b':
                {
                        int set, n;

                        ul = va_arg(ap, int);
                        p = va_arg(ap, char *);
                        kprintn(fd, ul, *p++);

                        if (!ul)
                                break;

                        for (set = 0; (n = *p++);) {
                                if (ul & (1 << (n - 1))) {
                                        putcharfd(set ? ',' : '<', fd);
                                        for (; (n = *p) > ' '; ++p)
                                                putcharfd(n, fd);
                                        set = 1;
                                } else
                                        for (; *p > ' '; ++p);
                        }
                        if (set)
                                putcharfd('>', fd);
                }
                        break;
                case 'c':
                        ch = va_arg(ap, int);
                        putcharfd(ch & 0x7f, fd);
                        break;
                case 's':
                        p = va_arg(ap, char *);
                        while ((ch = *p++))
                                putcharfd(ch, fd);
                        break;
                case 'd':
                        ul = lflag ? va_arg(ap, long) : va_arg(ap, int);
                        if ((long)ul < 0) {
                                putcharfd('-', fd);
                                ul = -(long)ul;
                        }
                        kprintn(fd, ul, 10);
                        break;
                case 'o':
                        ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
                        kprintn(fd, ul, 8);
                        break;
                case 'u':
                        ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
                        kprintn(fd, ul, 10);
                        break;
                case 'p':
                        putcharfd('0', fd);
                        putcharfd('x', fd);
                        lflag += sizeof(void *)==sizeof(u_long)? 1 : 0;
                case 'x':
                        ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
                        kprintn(fd, ul, 16);
                        break;
                case 'X':
                {
                        int l;

                        ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int);
                        if (lflag)
                                l = (sizeof(ulong) * 8) - 4;
                        else
                                l = (sizeof(u_int) * 8) - 4;
                        while (l >= 0) {
                                putcharfd("0123456789abcdef"[(ul >> l) & 0xf], fd);
                                l -= 4;
                        }
                        break;
                }
                default:
                        putcharfd('%', fd);
                        if (lflag)
                                putcharfd('l', fd);
                        putcharfd(ch, fd);
                }
        }
}

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

        p = buf;
        do {
                *p++ = "0123456789abcdef"[ul % base];
        } while (ul /= base);
        do {
                putcharfd(*--p, fd);
        } while (p > buf);
}

static const char ldso[] = "ld.so: ";

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

        _dl_printf("%s%s: ", ldso, __progname);
        va_start(ap, fmt);
        kdoprnt(2, fmt, ap);
        _dl_write(2, "\n", 1);
        va_end(ap);

        _dl_diedie();
}

__dead void
_dl_oom(void)
{
        static const char oom[] = ": out of memory\n";

        _dl_write(2, ldso, sizeof(ldso) - 1);
        _dl_write(2, __progname, _dl_strlen(__progname));
        _dl_write(2, oom, sizeof(oom) - 1);
        _dl_diedie();
}