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subr_prf.c
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subr_prf.c
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/* $OpenBSD: subr_prf.c,v 1.106 2022/08/14 01:58:28 jsg Exp $ */
/* $NetBSD: subr_prf.c,v 1.45 1997/10/24 18:14:25 chuck Exp $ */
/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
*
* @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/msgbuf.h>
#include <sys/proc.h>
#include <sys/tty.h>
#include <sys/tprintf.h>
#include <sys/syslog.h>
#include <sys/pool.h>
#include <sys/mutex.h>
#include <dev/cons.h>
/*
* note that stdarg.h and the ansi style va_start macro is used for both
* ansi and traditional c compilers.
*/
#include <sys/stdarg.h>
#ifdef DDB
#include <ddb/db_output.h> /* db_printf, db_putchar prototypes */
#include <ddb/db_var.h> /* db_log, db_radix */
#endif
/*
* defines
*/
/* flags for kprintf */
#define TOCONS 0x01 /* to the console */
#define TOTTY 0x02 /* to the process' tty */
#define TOLOG 0x04 /* to the kernel message buffer */
#define TOBUFONLY 0x08 /* to the buffer (only) [for snprintf] */
#define TODDB 0x10 /* to ddb console */
#define TOCOUNT 0x20 /* act like [v]snprintf */
/* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */
#define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2)
/*
* local prototypes
*/
int kprintf(const char *, int, void *, char *, va_list);
void kputchar(int, int, struct tty *);
struct mutex kprintf_mutex =
MUTEX_INITIALIZER_FLAGS(IPL_HIGH, "kprintf", MTX_NOWITNESS);
/*
* globals
*/
extern int log_open; /* subr_log: is /dev/klog open? */
const char *panicstr; /* arg to first call to panic (used as a flag
to indicate that panic has already been called). */
#ifdef DDB
/*
* Enter ddb on panic.
*/
int db_panic = 1;
/*
* db_console controls if we can be able to enter ddb by a special key
* combination (machine dependent).
* If DDB_SAFE_CONSOLE is defined in the kernel configuration it allows
* to break into console during boot. It's _really_ useful when debugging
* some things in the kernel that can cause init(8) to crash.
*/
#ifdef DDB_SAFE_CONSOLE
int db_console = 1;
#else
int db_console = 0;
#endif
#endif
/*
* panic on spl assertion failure?
*/
#ifdef SPLASSERT_WATCH
int splassert_ctl = 3;
#else
int splassert_ctl = 1;
#endif
/*
* v_putc: routine to putc on virtual console
*
* the v_putc pointer can be used to redirect the console cnputc elsewhere
* [e.g. to a "virtual console"].
*/
void (*v_putc)(int) = cnputc; /* start with cnputc (normal cons) */
/*
* Silence kernel printf when masquerading as a bootloader.
*/
#ifdef BOOT_QUIET
int printf_flags = TOLOG;
#else
int printf_flags = TOCONS | TOLOG;
#endif
/*
* functions
*/
/*
* Partial support (the failure case) of the assertion facility
* commonly found in userland.
*/
void
__assert(const char *t, const char *f, int l, const char *e)
{
panic(__KASSERTSTR, t, e, f, l);
}
/*
* tablefull: warn that a system table is full
*/
void
tablefull(const char *tab)
{
log(LOG_ERR, "%s: table is full\n", tab);
}
/*
* If we have panicked, prefer db_printf() and db_vprintf() where
* available.
*/
#ifdef DDB
#define panic_printf(...) db_printf(__VA_ARGS__)
#define panic_vprintf(...) db_vprintf(__VA_ARGS__)
#else
#define panic_printf(...) printf(__VA_ARGS__)
#define panic_vprintf(...) vprintf(__VA_ARGS__)
#endif
/*
* panic: handle an unresolvable fatal error
*
* prints "panic: <message>" and reboots. if called twice (i.e. recursive
* call) we avoid trying to sync the disk and just reboot (to avoid
* recursive panics).
*/
void
panic(const char *fmt, ...)
{
struct cpu_info *ci = curcpu();
int bootopt;
va_list ap;
bootopt = RB_AUTOBOOT | RB_DUMP;
if (atomic_cas_ptr(&panicstr, NULL, ci->ci_panicbuf) != NULL)
bootopt |= RB_NOSYNC;
/* do not trigger assertions, we know that we are inconsistent */
splassert_ctl = 0;
#ifdef BOOT_QUIET
printf_flags |= TOCONS; /* make sure we see kernel printf output */
#endif
/*
* All panic messages are printed, but only the first panic on a
* given CPU is written to its panicbuf.
*/
if (ci->ci_panicbuf[0] == '\0') {
va_start(ap, fmt);
vsnprintf(ci->ci_panicbuf, sizeof(ci->ci_panicbuf), fmt, ap);
va_end(ap);
panic_printf("panic: %s\n", ci->ci_panicbuf);
} else {
panic_printf("panic: ");
va_start(ap, fmt);
panic_vprintf(fmt, ap);
va_end(ap);
panic_printf("\n");
}
#ifdef DDB
if (db_panic)
db_enter();
else
db_stack_dump();
#endif
reboot(bootopt);
/* NOTREACHED */
}
/*
* We print only the function name. The file name is usually very long and
* would eat tons of space in the kernel.
*/
void
splassert_fail(int wantipl, int haveipl, const char *func)
{
if (panicstr || db_active)
return;
printf("splassert: %s: want %d have %d\n", func, wantipl, haveipl);
switch (splassert_ctl) {
case 1:
break;
case 2:
#ifdef DDB
db_stack_dump();
#endif
break;
case 3:
#ifdef DDB
db_stack_dump();
db_enter();
#endif
break;
default:
panic("spl assertion failure in %s", func);
}
}
/*
* kernel logging functions: log, logpri, addlog
*/
/*
* log: write to the log buffer
*
* => will not sleep [so safe to call from interrupt]
* => will log to console if /dev/klog isn't open
*/
void
log(int level, const char *fmt, ...)
{
int s;
va_list ap;
s = splhigh();
logpri(level); /* log the level first */
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, NULL, ap);
va_end(ap);
splx(s);
if (!log_open) {
va_start(ap, fmt);
mtx_enter(&kprintf_mutex);
kprintf(fmt, TOCONS, NULL, NULL, ap);
mtx_leave(&kprintf_mutex);
va_end(ap);
}
logwakeup(); /* wake up anyone waiting for log msgs */
}
/*
* logpri: log the priority level to the klog
*/
void
logpri(int level)
{
char *p;
char snbuf[KPRINTF_BUFSIZE];
kputchar('<', TOLOG, NULL);
snprintf(snbuf, sizeof snbuf, "%d", level);
for (p = snbuf ; *p ; p++)
kputchar(*p, TOLOG, NULL);
kputchar('>', TOLOG, NULL);
}
/*
* addlog: add info to previous log message
*/
int
addlog(const char *fmt, ...)
{
int s;
va_list ap;
s = splhigh();
va_start(ap, fmt);
kprintf(fmt, TOLOG, NULL, NULL, ap);
va_end(ap);
splx(s);
if (!log_open) {
va_start(ap, fmt);
mtx_enter(&kprintf_mutex);
kprintf(fmt, TOCONS, NULL, NULL, ap);
mtx_leave(&kprintf_mutex);
va_end(ap);
}
logwakeup();
return(0);
}
/*
* kputchar: print a single character on console or user terminal.
*
* => if console, then the last MSGBUFS chars are saved in msgbuf
* for inspection later (e.g. dmesg/syslog)
*/
void
kputchar(int c, int flags, struct tty *tp)
{
extern int msgbufmapped;
if (panicstr)
constty = NULL;
if ((flags & TOCONS) && tp == NULL && constty != NULL && !db_active) {
tp = constty;
flags |= TOTTY;
}
if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 &&
(flags & TOCONS) && tp == constty)
constty = NULL;
if ((flags & TOLOG) &&
c != '\0' && c != '\r' && c != 0177 && msgbufmapped)
msgbuf_putchar(msgbufp, c);
if ((flags & TOCONS) && (constty == NULL || db_active) && c != '\0')
(*v_putc)(c);
#ifdef DDB
if (flags & TODDB)
db_putchar(c);
#endif
}
/*
* uprintf: print to the controlling tty of the current process
*
* => we may block if the tty queue is full
* => no message is printed if the queue doesn't clear in a reasonable
* time
*/
void
uprintf(const char *fmt, ...)
{
struct process *pr = curproc->p_p;
va_list ap;
if (pr->ps_flags & PS_CONTROLT && pr->ps_session->s_ttyvp) {
va_start(ap, fmt);
kprintf(fmt, TOTTY, pr->ps_session->s_ttyp, NULL, ap);
va_end(ap);
}
}
#if defined(NFSSERVER) || defined(NFSCLIENT)
/*
* tprintf functions: used to send messages to a specific process
*
* usage:
* get a tpr_t handle on a process "p" by using "tprintf_open(p)"
* use the handle when calling "tprintf"
* when done, do a "tprintf_close" to drop the handle
*/
/*
* tprintf_open: get a tprintf handle on a process "p"
* XXX change s/proc/process
*
* => returns NULL if process can't be printed to
*/
tpr_t
tprintf_open(struct proc *p)
{
struct process *pr = p->p_p;
if (pr->ps_flags & PS_CONTROLT && pr->ps_session->s_ttyvp) {
SESSHOLD(pr->ps_session);
return ((tpr_t)pr->ps_session);
}
return ((tpr_t) NULL);
}
/*
* tprintf_close: dispose of a tprintf handle obtained with tprintf_open
*/
void
tprintf_close(tpr_t sess)
{
if (sess)
SESSRELE((struct session *) sess);
}
/*
* tprintf: given tprintf handle to a process [obtained with tprintf_open],
* send a message to the controlling tty for that process.
*
* => also sends message to /dev/klog
*/
void
tprintf(tpr_t tpr, const char *fmt, ...)
{
struct session *sess = (struct session *)tpr;
struct tty *tp = NULL;
int flags = TOLOG;
va_list ap;
logpri(LOG_INFO);
if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) {
flags |= TOTTY;
tp = sess->s_ttyp;
}
va_start(ap, fmt);
kprintf(fmt, flags, tp, NULL, ap);
va_end(ap);
logwakeup();
}
#endif /* NFSSERVER || NFSCLIENT */
/*
* ttyprintf: send a message to a specific tty
*
* => should be used only by tty driver or anything that knows the
* underlying tty will not be revoked(2)'d away. [otherwise,
* use tprintf]
*/
void
ttyprintf(struct tty *tp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
kprintf(fmt, TOTTY, tp, NULL, ap);
va_end(ap);
}
#ifdef DDB
/*
* db_printf: printf for DDB (via db_putchar)
*/
int
db_printf(const char *fmt, ...)
{
va_list ap;
int retval;
va_start(ap, fmt);
retval = db_vprintf(fmt, ap);
va_end(ap);
return(retval);
}
int
db_vprintf(const char *fmt, va_list ap)
{
int flags;
flags = TODDB;
if (db_log)
flags |= TOLOG;
return (kprintf(fmt, flags, NULL, NULL, ap));
}
#endif /* DDB */
/*
* normal kernel printf functions: printf, vprintf, snprintf
*/
/*
* printf: print a message to the console and the log
*/
int
printf(const char *fmt, ...)
{
va_list ap;
int retval;
va_start(ap, fmt);
mtx_enter(&kprintf_mutex);
retval = kprintf(fmt, printf_flags, NULL, NULL, ap);
mtx_leave(&kprintf_mutex);
va_end(ap);
if (!panicstr)
logwakeup();
return(retval);
}
/*
* vprintf: print a message to the console and the log [already have a
* va_list]
*/
int
vprintf(const char *fmt, va_list ap)
{
int retval;
mtx_enter(&kprintf_mutex);
retval = kprintf(fmt, TOCONS | TOLOG, NULL, NULL, ap);
mtx_leave(&kprintf_mutex);
if (!panicstr)
logwakeup();
return (retval);
}
/*
* snprintf: print a message to a buffer
*/
int
snprintf(char *buf, size_t size, const char *fmt, ...)
{
int retval;
va_list ap;
char *p;
p = buf;
if (size > 0)
p += size - 1;
va_start(ap, fmt);
retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap);
va_end(ap);
if (size > 0)
*p = '\0'; /* null terminate */
return(retval);
}
/*
* vsnprintf: print a message to a buffer [already have va_alist]
*/
int
vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
{
int retval;
char *p;
p = buf + size - 1;
if (size < 1)
p = buf;
retval = kprintf(fmt, TOBUFONLY | TOCOUNT, &p, buf, ap);
if (size > 0)
*(p) = 0; /* null terminate */
return(retval);
}
/*
* kprintf: scaled down version of printf(3).
*
* this version based on vfprintf() from libc which was derived from
* software contributed to Berkeley by Chris Torek.
*
* The additional 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:
*
* kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
*
* would produce output:
*
* reg=3<BITTWO,BITONE>
*
* To support larger integers (> 32 bits), %b formatting will also accept
* control characters in the region 0x80 - 0xff. 0x80 refers to bit 0,
* 0x81 refers to bit 1, and so on. The equivalent string to the above is:
*
* kprintf("reg=%b\n", 3, "\10\201BITTWO\200BITONE\n");
*
* and would produce the same output.
*
* Like the rest of printf, %b can be prefixed to handle various size
* modifiers, eg. %b is for "int", %lb is for "long", and %llb supports
* "long long".
*
* This code is large and complicated...
*/
/*
* 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')
/*
* flags used during conversion.
*/
#define ALT 0x001 /* alternate form */
#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
#define LADJUST 0x004 /* left adjustment */
#define LONGDBL 0x008 /* long double; unimplemented */
#define LONGINT 0x010 /* long integer */
#define QUADINT 0x020 /* quad integer */
#define SHORTINT 0x040 /* short integer */
#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
#define FPT 0x100 /* Floating point number */
#define SIZEINT 0x200 /* (signed) size_t */
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \
(flags&QUADINT ? va_arg(ap, quad_t) : \
flags&LONGINT ? va_arg(ap, long) : \
flags&SIZEINT ? va_arg(ap, ssize_t) : \
flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
(long)va_arg(ap, int))
#define UARG() \
(flags&QUADINT ? va_arg(ap, u_quad_t) : \
flags&LONGINT ? va_arg(ap, u_long) : \
flags&SIZEINT ? va_arg(ap, size_t) : \
flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
(u_long)va_arg(ap, u_int))
#define KPRINTF_PUTCHAR(C) do { \
int chr = (C); \
ret += 1; \
if (oflags & TOBUFONLY) { \
if ((vp != NULL) && (sbuf == tailp)) { \
if (!(oflags & TOCOUNT)) \
goto overflow; \
} else \
*sbuf++ = chr; \
} else { \
kputchar(chr, oflags, (struct tty *)vp); \
} \
} while(0)
int
kprintf(const char *fmt0, int oflags, void *vp, char *sbuf, va_list ap)
{
char *fmt; /* format string */
int ch; /* character from fmt */
int n; /* handy integer (short term usage) */
char *cp = NULL; /* handy char pointer (short term usage) */
int flags; /* flags as above */
int ret; /* return value accumulator */
int width; /* width from format (%8d), or 0 */
int prec; /* precision from format (%.3d), or -1 */
char sign; /* sign prefix (' ', '+', '-', or \0) */
u_quad_t _uquad; /* integer arguments %[diouxX] */
enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
int realsz; /* field size expanded by dprec */
int size = 0; /* size of converted field or string */
char *xdigs = NULL; /* digits for [xX] conversion */
char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */
char *tailp = NULL; /* tail pointer for snprintf */
if (oflags & TOCONS)
MUTEX_ASSERT_LOCKED(&kprintf_mutex);
if ((oflags & TOBUFONLY) && (vp != NULL))
tailp = *(char **)vp;
fmt = (char *)fmt0;
ret = 0;
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
while (*fmt != '%' && *fmt) {
KPRINTF_PUTCHAR(*fmt++);
}
if (*fmt == 0)
goto done;
fmt++; /* skip over '%' */
flags = 0;
dprec = 0;
width = 0;
prec = -1;
sign = '\0';
rflag: ch = *fmt++;
reswitch: switch (ch) {
/* XXX: non-standard '%b' format */
case 'b': {
char *b, *z;
int tmp;
_uquad = UARG();
b = va_arg(ap, char *);
if (*b == 8)
snprintf(buf, sizeof buf, "%llo", _uquad);
else if (*b == 10)
snprintf(buf, sizeof buf, "%lld", _uquad);
else if (*b == 16)
snprintf(buf, sizeof buf, "%llx", _uquad);
else
break;
b++;
z = buf;
while (*z) {
KPRINTF_PUTCHAR(*z++);
}
if (_uquad) {
tmp = 0;
while ((n = *b++) != 0) {
if (n & 0x80)
n &= 0x7f;
else if (n <= ' ')
n = n - 1;
if (_uquad & (1LL << n)) {
KPRINTF_PUTCHAR(tmp ? ',':'<');
while (*b > ' ' &&
(*b & 0x80) == 0) {
KPRINTF_PUTCHAR(*b);
b++;
}
tmp = 1;
} else {
while (*b > ' ' &&
(*b & 0x80) == 0)
b++;
}
}
if (tmp) {
KPRINTF_PUTCHAR('>');
}
}
continue; /* no output */
}
case ' ':
/*
* ``If the space and + flags both appear, the space
* flag will be ignored.''
* -- ANSI X3J11
*/
if (!sign)
sign = ' ';
goto rflag;
case '#':
flags |= ALT;
goto rflag;
case '*':
/*
* ``A negative field width argument is taken as a
* - flag followed by a positive field width.''
* -- ANSI X3J11
* They don't exclude field widths read from args.
*/
if ((width = va_arg(ap, int)) >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
case '-':
flags |= LADJUST;
goto rflag;
case '+':
sign = '+';
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
n = va_arg(ap, int);
prec = n < 0 ? -1 : n;
goto rflag;
}
n = 0;
while (is_digit(ch)) {
n = 10 * n + to_digit(ch);
ch = *fmt++;
}
prec = n < 0 ? -1 : n;
goto reswitch;
case '0':
/*
* ``Note that 0 is taken as a flag, not as the
* beginning of a field width.''
* -- ANSI X3J11
*/
flags |= ZEROPAD;
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 'h':
flags |= SHORTINT;
goto rflag;
case 'l':
if (*fmt == 'l') {
fmt++;
flags |= QUADINT;
} else {
flags |= LONGINT;
}
goto rflag;
case 'q':
flags |= QUADINT;
goto rflag;
case 'z':
flags |= SIZEINT;
goto rflag;
case 'c':
*(cp = buf) = va_arg(ap, int);
size = 1;
sign = '\0';
break;
case 't':
/* ptrdiff_t */
/* FALLTHROUGH */
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
_uquad = SARG();
if ((quad_t)_uquad < 0) {
_uquad = -_uquad;
sign = '-';
}
base = DEC;
goto number;
case 'n':
panic("no %%n support");
break;
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
_uquad = UARG();
base = OCT;
goto nosign;
case 'p':
/*
* ``The argument shall be a pointer to void. The
* value of the pointer is converted to a sequence
* of printable characters, in an implementation-
* defined manner.''
* -- ANSI X3J11
*/
_uquad = (u_long)va_arg(ap, void *);
base = HEX;
xdigs = "0123456789abcdef";
flags |= HEXPREFIX;
ch = 'x';
goto nosign;
case 's':
if ((cp = va_arg(ap, char *)) == NULL)
cp = "(null)";
if (prec >= 0) {
/*
* can't use strlen; can only look for the
* NUL in the first `prec' characters, and
* strlen() will go further.
*/
char *p = memchr(cp, 0, prec);
if (p != NULL) {
size = p - cp;
if (size > prec)
size = prec;
} else
size = prec;
} else
size = strlen(cp);
sign = '\0';
break;
case 'U':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'u':
_uquad = UARG();
base = DEC;
goto nosign;
case 'X':
xdigs = "0123456789ABCDEF";
goto hex;
case 'x':
xdigs = "0123456789abcdef";
hex: _uquad = UARG();
base = HEX;
/* leading 0x/X only if non-zero */
if (flags & ALT && _uquad != 0)
flags |= HEXPREFIX;
/* unsigned conversions */
nosign: sign = '\0';
/*
* ``... diouXx conversions ... if a precision is
* specified, the 0 flag will be ignored.''
* -- ANSI X3J11
*/
number: if ((dprec = prec) >= 0)
flags &= ~ZEROPAD;
/*
* ``The result of converting a zero value with an
* explicit precision of zero is no characters.''
* -- ANSI X3J11
*/
cp = buf + KPRINTF_BUFSIZE;
if (_uquad != 0 || prec != 0) {
/*
* Unsigned mod is hard, and unsigned mod
* by a constant is easier than that by
* a variable; hence this switch.
*/
switch (base) {
case OCT:
do {
*--cp = to_char(_uquad & 7);
_uquad >>= 3;
} while (_uquad);
/* handle octal leading 0 */
if (flags & ALT && *cp != '0')
*--cp = '0';
break;
case DEC:
/* many numbers are 1 digit */
while (_uquad >= 10) {
*--cp = to_char(_uquad % 10);
_uquad /= 10;
}
*--cp = to_char(_uquad);
break;
case HEX:
do {
*--cp = xdigs[_uquad & 15];
_uquad >>= 4;
} while (_uquad);
break;
default:
cp = "bug in kprintf: bad base";
size = strlen(cp);
goto skipsize;
}