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/* $OpenBSD: dl_printf.c,v 1.17 2012/12/05 23:20:06 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 "syscall.h"
#include "util.h"
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_fdprintf(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')
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);
}
}
_dl_flushbuf();
}
static void
kprintn(int fd, unsigned long ul, int base)
{
/* hold a long in base 8 */
char *p, buf[(sizeof(long) * NBBY / 3) + 1];
p = buf;
do {
*p++ = "0123456789abcdef"[ul % base];
} while (ul /= base);
do {
putcharfd(*--p, fd);
} while (p > buf);
}
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