minix/libexec/ld.elf_so/xprintf.c

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/* $NetBSD: xprintf.c,v 1.21 2010/12/16 22:52:32 joerg Exp $ */
/*
* Copyright 1996 Matt Thomas <matt@3am-software.com>
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: xprintf.c,v 1.21 2010/12/16 22:52:32 joerg Exp $");
#endif /* not lint */
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <stdarg.h>
#include "rtldenv.h"
#ifdef RTLD_LOADER
#define SZ_LONG 0x01
#define SZ_UNSIGNED 0x02
#define SZ_SIZE_T 0x04
/*
* Non-mallocing printf, for use by malloc and rtld itself.
* This avoids putting in most of stdio.
*
* deals withs formats %x, %p, %s, and %d.
*/
size_t
xvsnprintf(char *buf, size_t buflen, const char *fmt, va_list ap)
{
char *bp = buf;
char *const ep = buf + buflen - 4;
int size, prec;
while (*fmt != '\0' && bp < ep) {
switch (*fmt) {
case '\\':{
if (fmt[1] != '\0')
*bp++ = *++fmt;
continue;
}
case '%':{
size = 0;
prec = -1;
rflag: switch (fmt[1]) {
case '*':
prec = va_arg(ap, int);
/* FALLTHROUGH */
case '.':
fmt++;
goto rflag;
case 'l':
size |= SZ_LONG;
fmt++;
goto rflag;
case 'z':
size |= SZ_SIZE_T;
fmt++;
goto rflag;
case 'u':
size |= SZ_UNSIGNED;
/* FALLTHROUGH */
case 'd':{
long sval;
unsigned long uval;
char digits[sizeof(int) * 3], *dp = digits;
#define SARG() \
(size & SZ_LONG ? va_arg(ap, long) : \
((size & SZ_SIZE_T ? (long)va_arg(ap, size_t) : \
va_arg(ap, int))))
#define UARG() \
(size & SZ_LONG ? va_arg(ap, unsigned long) : \
((size & SZ_SIZE_T ? va_arg(ap, size_t) : \
va_arg(ap, unsigned int))))
if (fmt[1] == 'd') {
if (size & SZ_UNSIGNED)
sval = UARG();
else
sval = SARG();
if (sval < 0) {
if ((sval << 1) == 0) {
/*
* We can't flip the
* sign of this since
* it can't be
* represented as a
* positive number in
* two complement,
* handle the first
* digit. After that,
* it can be flipped
* since it is now not
* 2^(n-1).
*/
*dp++ = '0'-(sval % 10);
sval /= 10;
}
*bp++ = '-';
uval = -sval;
} else {
uval = sval;
}
} else {
if (size & SZ_UNSIGNED)
uval = UARG();
else
uval = SARG();
}
do {
*dp++ = '0' + (uval % 10);
uval /= 10;
} while (uval != 0);
do {
*bp++ = *--dp;
} while (dp != digits && bp < ep);
fmt += 2;
break;
}
case 'x':
case 'p':{
unsigned long val = va_arg(ap, unsigned long);
unsigned long mask = ~(~0UL >> 4);
int bits = sizeof(val) * 8 - 4;
const char hexdigits[] = "0123456789abcdef";
if (fmt[1] == 'p') {
*bp++ = '0';
*bp++ = 'x';
}
/* handle the border case */
if (val == 0) {
*bp++ = '0';
fmt += 2;
break;
}
/* suppress 0s */
while ((val & mask) == 0)
bits -= 4, mask >>= 4;
/* emit the hex digits */
while (bits >= 0 && bp < ep) {
*bp++ = hexdigits[(val & mask) >> bits];
bits -= 4, mask >>= 4;
}
fmt += 2;
break;
}
case 's':{
const char *str = va_arg(ap, const char *);
int len;
if (str == NULL)
str = "(null)";
if (prec < 0)
len = strlen(str);
else
len = prec;
if (ep - bp < len)
len = ep - bp;
memcpy(bp, str, len);
bp += len;
fmt += 2;
break;
}
case 'c':{
int c = va_arg(ap, int);
*bp++ = (char)c;
fmt += 2;
break;
}
default:
*bp++ = *fmt;
break;
}
break;
}
default:
*bp++ = *fmt++;
break;
}
}
*bp = '\0';
return bp - buf;
}
void
xvprintf(const char *fmt, va_list ap)
{
char buf[256];
(void) write(2, buf, xvsnprintf(buf, sizeof(buf), fmt, ap));
}
void
xprintf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
}
void
xsnprintf(char *buf, size_t buflen, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvsnprintf(buf, buflen, fmt, ap);
va_end(ap);
}
#include "errlist_concat.h"
const char *
xstrerror(int error)
{
if (error >= concat_nerr || error < 0) {
static char buf[128];
xsnprintf(buf, sizeof(buf), "Unknown error: %d", error);
return buf;
}
return concat_errlist + concat_offset[error];
}
void
xerrx(int eval, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
(void) write(2, "\n", 1);
exit(eval);
}
void
xerr(int eval, const char *fmt, ...)
{
int saved_errno = errno;
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
xprintf(": %s\n", xstrerror(saved_errno));
exit(eval);
}
void
xwarn(const char *fmt, ...)
{
int saved_errno = errno;
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
xprintf(": %s\n", xstrerror(saved_errno));
errno = saved_errno;
}
void
xwarnx(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xvprintf(fmt, ap);
va_end(ap);
(void) write(2, "\n", 1);
}
#ifdef DEBUG
void
xassert(const char *file, int line, const char *failedexpr)
{
xprintf("assertion \"%s\" failed: file \"%s\", line %d\n",
failedexpr, file, line);
abort();
/* NOTREACHED */
}
#endif
#endif