NetBSD/sys/lib/libsa/subr_prf.c

172 lines
4.0 KiB
C

/* $NetBSD: subr_prf.c,v 1.15 2006/01/27 02:28:36 uwe 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).
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/stdint.h> /* XXX: for intptr_t */
#include <machine/stdarg.h>
#include "stand.h"
static void kprintn(void (*)(int), u_long, int);
static void sputchar(int);
static void kdoprnt(void (*)(int), const char *, va_list);
static char *sbuf, *ebuf;
const char HEXDIGITS[] = "0123456789ABCDEF";
const char hexdigits[] = "0123456789abcdef";
static void
sputchar(int c)
{
if (sbuf < ebuf)
*sbuf++ = c;
}
void
vprintf(const char *fmt, va_list ap)
{
kdoprnt(putchar, fmt, ap);
}
int
vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
{
sbuf = buf;
ebuf = buf + size - 1;
kdoprnt(sputchar, fmt, ap);
*sbuf = '\0';
return (sbuf - buf);
}
static void
kdoprnt(void (*put)(int), const char *fmt, va_list ap)
{
char *p;
int ch;
unsigned long ul;
int lflag;
for (;;) {
while ((ch = *fmt++) != '%') {
if (ch == '\0')
return;
put(ch);
}
lflag = 0;
reswitch: switch (ch = *fmt++) {
case 'l':
lflag = 1;
goto reswitch;
case 't':
#if 0 /* XXX: abuse intptr_t until the situation with ptrdiff_t is clear */
lflag = (sizeof(ptrdiff_t) == sizeof(long));
#else
lflag = (sizeof(intptr_t) == sizeof(long));
#endif
goto reswitch;
case 'z':
lflag = (sizeof(size_t) == sizeof(unsigned long));
goto reswitch;
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':
ul = lflag ?
va_arg(ap, long) : va_arg(ap, int);
if ((long)ul < 0) {
put('-');
ul = -(long)ul;
}
kprintn(put, ul, 10);
break;
case 'o':
ul = lflag ?
va_arg(ap, u_long) : va_arg(ap, u_int);
kprintn(put, ul, 8);
break;
case 'u':
ul = lflag ?
va_arg(ap, u_long) : va_arg(ap, u_int);
kprintn(put, ul, 10);
break;
case 'p':
put('0');
put('x');
lflag = 1;
/* FALLTHROUGH */
case 'x':
ul = lflag ?
va_arg(ap, u_long) : va_arg(ap, u_int);
kprintn(put, ul, 16);
break;
default:
put('%');
if (lflag)
put('l');
if (ch == '\0')
return;
put(ch);
}
}
}
static void
kprintn(void (*put)(int), unsigned long ul, int base)
{
/* hold a long in base 8 */
char *p, buf[(sizeof(long) * NBBY / 3) + 1];
p = buf;
do {
*p++ = hexdigits[ul % base];
} while (ul /= base);
do {
put(*--p);
} while (p > buf);
}