subr_prf.c

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    1 /*-
    2  * Copyright (c) 1986, 1988, 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)subr_prf.c  8.3 (Berkeley) 1/21/94
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/10.2/sys/kern/subr_prf.c 284435 2015-06-16 02:31:11Z ken $");
   39 
   40 #ifdef _KERNEL
   41 #include "opt_ddb.h"
   42 #include "opt_printf.h"
   43 #endif  /* _KERNEL */
   44 
   45 #include <sys/param.h>
   46 #ifdef _KERNEL
   47 #include <sys/systm.h>
   48 #include <sys/lock.h>
   49 #include <sys/kdb.h>
   50 #include <sys/mutex.h>
   51 #include <sys/sx.h>
   52 #include <sys/kernel.h>
   53 #include <sys/msgbuf.h>
   54 #include <sys/malloc.h>
   55 #include <sys/priv.h>
   56 #include <sys/proc.h>
   57 #include <sys/stddef.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/tty.h>
   60 #include <sys/syslog.h>
   61 #include <sys/cons.h>
   62 #include <sys/uio.h>
   63 #endif
   64 #include <sys/ctype.h>
   65 #include <sys/sbuf.h>
   66 
   67 #ifdef DDB
   68 #include <ddb/ddb.h>
   69 #endif
   70 
   71 /*
   72  * Note that stdarg.h and the ANSI style va_start macro is used for both
   73  * ANSI and traditional C compilers.
   74  */
   75 #include <machine/stdarg.h>
   76 
   77 #ifdef _KERNEL
   78 
   79 #define TOCONS  0x01
   80 #define TOTTY   0x02
   81 #define TOLOG   0x04
   82 
   83 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
   84 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
   85 
   86 struct putchar_arg {
   87         int     flags;
   88         int     pri;
   89         struct  tty *tty;
   90         char    *p_bufr;
   91         size_t  n_bufr;
   92         char    *p_next;
   93         size_t  remain;
   94 };
   95 
   96 struct snprintf_arg {
   97         char    *str;
   98         size_t  remain;
   99 };
  100 
  101 extern  int log_open;
  102 
  103 static void  msglogchar(int c, int pri);
  104 static void  msglogstr(char *str, int pri, int filter_cr);
  105 static void  putchar(int ch, void *arg);
  106 static char *ksprintn(char *nbuf, uintmax_t num, int base, int *len, int upper);
  107 static void  snprintf_func(int ch, void *arg);
  108 
  109 static int msgbufmapped;                /* Set when safe to use msgbuf */
  110 int msgbuftrigger;
  111 
  112 static int      log_console_output = 1;
  113 TUNABLE_INT("kern.log_console_output", &log_console_output);
  114 SYSCTL_INT(_kern, OID_AUTO, log_console_output, CTLFLAG_RW,
  115     &log_console_output, 0, "Duplicate console output to the syslog.");
  116 
  117 /*
  118  * See the comment in log_console() below for more explanation of this.
  119  */
  120 static int log_console_add_linefeed = 0;
  121 TUNABLE_INT("kern.log_console_add_linefeed", &log_console_add_linefeed);
  122 SYSCTL_INT(_kern, OID_AUTO, log_console_add_linefeed, CTLFLAG_RW,
  123     &log_console_add_linefeed, 0, "log_console() adds extra newlines.");
  124 
  125 static int      always_console_output = 0;
  126 TUNABLE_INT("kern.always_console_output", &always_console_output);
  127 SYSCTL_INT(_kern, OID_AUTO, always_console_output, CTLFLAG_RW,
  128     &always_console_output, 0, "Always output to console despite TIOCCONS.");
  129 
  130 /*
  131  * Warn that a system table is full.
  132  */
  133 void
  134 tablefull(const char *tab)
  135 {
  136 
  137         log(LOG_ERR, "%s: table is full\n", tab);
  138 }
  139 
  140 /*
  141  * Uprintf prints to the controlling terminal for the current process.
  142  */
  143 int
  144 uprintf(const char *fmt, ...)
  145 {
  146         va_list ap;
  147         struct putchar_arg pca;
  148         struct proc *p;
  149         struct thread *td;
  150         int retval;
  151 
  152         td = curthread;
  153         if (TD_IS_IDLETHREAD(td))
  154                 return (0);
  155 
  156         sx_slock(&proctree_lock);
  157         p = td->td_proc;
  158         PROC_LOCK(p);
  159         if ((p->p_flag & P_CONTROLT) == 0) {
  160                 PROC_UNLOCK(p);
  161                 sx_sunlock(&proctree_lock);
  162                 return (0);
  163         }
  164         SESS_LOCK(p->p_session);
  165         pca.tty = p->p_session->s_ttyp;
  166         SESS_UNLOCK(p->p_session);
  167         PROC_UNLOCK(p);
  168         if (pca.tty == NULL) {
  169                 sx_sunlock(&proctree_lock);
  170                 return (0);
  171         }
  172         pca.flags = TOTTY;
  173         pca.p_bufr = NULL;
  174         va_start(ap, fmt);
  175         tty_lock(pca.tty);
  176         sx_sunlock(&proctree_lock);
  177         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  178         tty_unlock(pca.tty);
  179         va_end(ap);
  180         return (retval);
  181 }
  182 
  183 /*
  184  * tprintf and vtprintf print on the controlling terminal associated with the
  185  * given session, possibly to the log as well.
  186  */
  187 void
  188 tprintf(struct proc *p, int pri, const char *fmt, ...)
  189 {
  190         va_list ap;
  191 
  192         va_start(ap, fmt);
  193         vtprintf(p, pri, fmt, ap);
  194         va_end(ap);
  195 }
  196 
  197 void
  198 vtprintf(struct proc *p, int pri, const char *fmt, va_list ap)
  199 {
  200         struct tty *tp = NULL;
  201         int flags = 0;
  202         struct putchar_arg pca;
  203         struct session *sess = NULL;
  204 
  205         sx_slock(&proctree_lock);
  206         if (pri != -1)
  207                 flags |= TOLOG;
  208         if (p != NULL) {
  209                 PROC_LOCK(p);
  210                 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) {
  211                         sess = p->p_session;
  212                         sess_hold(sess);
  213                         PROC_UNLOCK(p);
  214                         tp = sess->s_ttyp;
  215                         if (tp != NULL && tty_checkoutq(tp))
  216                                 flags |= TOTTY;
  217                         else
  218                                 tp = NULL;
  219                 } else
  220                         PROC_UNLOCK(p);
  221         }
  222         pca.pri = pri;
  223         pca.tty = tp;
  224         pca.flags = flags;
  225         pca.p_bufr = NULL;
  226         if (pca.tty != NULL)
  227                 tty_lock(pca.tty);
  228         sx_sunlock(&proctree_lock);
  229         kvprintf(fmt, putchar, &pca, 10, ap);
  230         if (pca.tty != NULL)
  231                 tty_unlock(pca.tty);
  232         if (sess != NULL)
  233                 sess_release(sess);
  234         msgbuftrigger = 1;
  235 }
  236 
  237 /*
  238  * Ttyprintf displays a message on a tty; it should be used only by
  239  * the tty driver, or anything that knows the underlying tty will not
  240  * be revoke(2)'d away.  Other callers should use tprintf.
  241  */
  242 int
  243 ttyprintf(struct tty *tp, const char *fmt, ...)
  244 {
  245         va_list ap;
  246         struct putchar_arg pca;
  247         int retval;
  248 
  249         va_start(ap, fmt);
  250         pca.tty = tp;
  251         pca.flags = TOTTY;
  252         pca.p_bufr = NULL;
  253         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  254         va_end(ap);
  255         return (retval);
  256 }
  257 
  258 static int
  259 _vprintf(int level, int flags, const char *fmt, va_list ap)
  260 {
  261         struct putchar_arg pca;
  262         int retval;
  263 #ifdef PRINTF_BUFR_SIZE
  264         char bufr[PRINTF_BUFR_SIZE];
  265 #endif
  266 
  267         pca.tty = NULL;
  268         pca.pri = level;
  269         pca.flags = flags;
  270 #ifdef PRINTF_BUFR_SIZE
  271         pca.p_bufr = bufr;
  272         pca.p_next = pca.p_bufr;
  273         pca.n_bufr = sizeof(bufr);
  274         pca.remain = sizeof(bufr);
  275         *pca.p_next = '\0';
  276 #else
  277         /* Don't buffer console output. */
  278         pca.p_bufr = NULL;
  279 #endif
  280 
  281         retval = kvprintf(fmt, putchar, &pca, 10, ap);
  282 
  283 #ifdef PRINTF_BUFR_SIZE
  284         /* Write any buffered console/log output: */
  285         if (*pca.p_bufr != '\0') {
  286                 if (pca.flags & TOLOG)
  287                         msglogstr(pca.p_bufr, level, /*filter_cr*/1);
  288 
  289                 if (pca.flags & TOCONS)
  290                         cnputs(pca.p_bufr);
  291         }
  292 #endif
  293 
  294         return (retval);
  295 }
  296 
  297 /*
  298  * Log writes to the log buffer, and guarantees not to sleep (so can be
  299  * called by interrupt routines).  If there is no process reading the
  300  * log yet, it writes to the console also.
  301  */
  302 void
  303 log(int level, const char *fmt, ...)
  304 {
  305         va_list ap;
  306 
  307         va_start(ap, fmt);
  308         (void)_vprintf(level, log_open ? TOLOG : TOCONS, fmt, ap);
  309         va_end(ap);
  310 
  311         msgbuftrigger = 1;
  312 }
  313 
  314 #define CONSCHUNK 128
  315 
  316 void
  317 log_console(struct uio *uio)
  318 {
  319         int c, error, nl;
  320         char *consbuffer;
  321         int pri;
  322 
  323         if (!log_console_output)
  324                 return;
  325 
  326         pri = LOG_INFO | LOG_CONSOLE;
  327         uio = cloneuio(uio);
  328         consbuffer = malloc(CONSCHUNK, M_TEMP, M_WAITOK);
  329 
  330         nl = 0;
  331         while (uio->uio_resid > 0) {
  332                 c = imin(uio->uio_resid, CONSCHUNK - 1);
  333                 error = uiomove(consbuffer, c, uio);
  334                 if (error != 0)
  335                         break;
  336                 /* Make sure we're NUL-terminated */
  337                 consbuffer[c] = '\0';
  338                 if (consbuffer[c - 1] == '\n')
  339                         nl = 1;
  340                 else
  341                         nl = 0;
  342                 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
  343         }
  344         /*
  345          * The previous behavior in log_console() is preserved when
  346          * log_console_add_linefeed is non-zero.  For that behavior, if an
  347          * individual console write came in that was not terminated with a
  348          * line feed, it would add a line feed.
  349          *
  350          * This results in different data in the message buffer than
  351          * appears on the system console (which doesn't add extra line feed
  352          * characters).
  353          *
  354          * A number of programs and rc scripts write a line feed, or a period
  355          * and a line feed when they have completed their operation.  On
  356          * the console, this looks seamless, but when displayed with
  357          * 'dmesg -a', you wind up with output that looks like this:
  358          *
  359          * Updating motd:
  360          * .
  361          *
  362          * On the console, it looks like this:
  363          * Updating motd:.
  364          *
  365          * We could add logic to detect that situation, or just not insert
  366          * the extra newlines.  Set the kern.log_console_add_linefeed
  367          * sysctl/tunable variable to get the old behavior.
  368          */
  369         if (!nl && log_console_add_linefeed) {
  370                 consbuffer[0] = '\n';
  371                 consbuffer[1] = '\0';
  372                 msglogstr(consbuffer, pri, /*filter_cr*/ 1);
  373         }
  374         msgbuftrigger = 1;
  375         free(uio, M_IOV);
  376         free(consbuffer, M_TEMP);
  377         return;
  378 }
  379 
  380 int
  381 printf(const char *fmt, ...)
  382 {
  383         va_list ap;
  384         int retval;
  385 
  386         va_start(ap, fmt);
  387         retval = vprintf(fmt, ap);
  388         va_end(ap);
  389 
  390         return (retval);
  391 }
  392 
  393 int
  394 vprintf(const char *fmt, va_list ap)
  395 {
  396         int retval;
  397 
  398         retval = _vprintf(-1, TOCONS | TOLOG, fmt, ap);
  399 
  400         if (!panicstr)
  401                 msgbuftrigger = 1;
  402 
  403         return (retval);
  404 }
  405 
  406 static void
  407 putbuf(int c, struct putchar_arg *ap)
  408 {
  409         /* Check if no console output buffer was provided. */
  410         if (ap->p_bufr == NULL) {
  411                 /* Output direct to the console. */
  412                 if (ap->flags & TOCONS)
  413                         cnputc(c);
  414 
  415                 if (ap->flags & TOLOG)
  416                         msglogchar(c, ap->pri);
  417         } else {
  418                 /* Buffer the character: */
  419                 *ap->p_next++ = c;
  420                 ap->remain--;
  421 
  422                 /* Always leave the buffer zero terminated. */
  423                 *ap->p_next = '\0';
  424 
  425                 /* Check if the buffer needs to be flushed. */
  426                 if (ap->remain == 2 || c == '\n') {
  427 
  428                         if (ap->flags & TOLOG)
  429                                 msglogstr(ap->p_bufr, ap->pri, /*filter_cr*/1);
  430 
  431                         if (ap->flags & TOCONS) {
  432                                 if ((panicstr == NULL) && (constty != NULL))
  433                                         msgbuf_addstr(&consmsgbuf, -1,
  434                                             ap->p_bufr, /*filter_cr*/ 0);
  435 
  436                                 if ((constty == NULL) ||(always_console_output))
  437                                         cnputs(ap->p_bufr);
  438                         }
  439 
  440                         ap->p_next = ap->p_bufr;
  441                         ap->remain = ap->n_bufr;
  442                         *ap->p_next = '\0';
  443                 }
  444 
  445                 /*
  446                  * Since we fill the buffer up one character at a time,
  447                  * this should not happen.  We should always catch it when
  448                  * ap->remain == 2 (if not sooner due to a newline), flush
  449                  * the buffer and move on.  One way this could happen is
  450                  * if someone sets PRINTF_BUFR_SIZE to 1 or something
  451                  * similarly silly.
  452                  */
  453                 KASSERT(ap->remain > 2, ("Bad buffer logic, remain = %zd",
  454                     ap->remain));
  455         }
  456 }
  457 
  458 /*
  459  * Print a character on console or users terminal.  If destination is
  460  * the console then the last bunch of characters are saved in msgbuf for
  461  * inspection later.
  462  */
  463 static void
  464 putchar(int c, void *arg)
  465 {
  466         struct putchar_arg *ap = (struct putchar_arg*) arg;
  467         struct tty *tp = ap->tty;
  468         int flags = ap->flags;
  469 
  470         /* Don't use the tty code after a panic or while in ddb. */
  471         if (kdb_active) {
  472                 if (c != '\0')
  473                         cnputc(c);
  474                 return;
  475         }
  476 
  477         if ((flags & TOTTY) && tp != NULL && panicstr == NULL)
  478                 tty_putchar(tp, c);
  479 
  480         if ((flags & (TOCONS | TOLOG)) && c != '\0')
  481                 putbuf(c, ap);
  482 }
  483 
  484 /*
  485  * Scaled down version of sprintf(3).
  486  */
  487 int
  488 sprintf(char *buf, const char *cfmt, ...)
  489 {
  490         int retval;
  491         va_list ap;
  492 
  493         va_start(ap, cfmt);
  494         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  495         buf[retval] = '\0';
  496         va_end(ap);
  497         return (retval);
  498 }
  499 
  500 /*
  501  * Scaled down version of vsprintf(3).
  502  */
  503 int
  504 vsprintf(char *buf, const char *cfmt, va_list ap)
  505 {
  506         int retval;
  507 
  508         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  509         buf[retval] = '\0';
  510         return (retval);
  511 }
  512 
  513 /*
  514  * Scaled down version of snprintf(3).
  515  */
  516 int
  517 snprintf(char *str, size_t size, const char *format, ...)
  518 {
  519         int retval;
  520         va_list ap;
  521 
  522         va_start(ap, format);
  523         retval = vsnprintf(str, size, format, ap);
  524         va_end(ap);
  525         return(retval);
  526 }
  527 
  528 /*
  529  * Scaled down version of vsnprintf(3).
  530  */
  531 int
  532 vsnprintf(char *str, size_t size, const char *format, va_list ap)
  533 {
  534         struct snprintf_arg info;
  535         int retval;
  536 
  537         info.str = str;
  538         info.remain = size;
  539         retval = kvprintf(format, snprintf_func, &info, 10, ap);
  540         if (info.remain >= 1)
  541                 *info.str++ = '\0';
  542         return (retval);
  543 }
  544 
  545 /*
  546  * Kernel version which takes radix argument vsnprintf(3).
  547  */
  548 int
  549 vsnrprintf(char *str, size_t size, int radix, const char *format, va_list ap)
  550 {
  551         struct snprintf_arg info;
  552         int retval;
  553 
  554         info.str = str;
  555         info.remain = size;
  556         retval = kvprintf(format, snprintf_func, &info, radix, ap);
  557         if (info.remain >= 1)
  558                 *info.str++ = '\0';
  559         return (retval);
  560 }
  561 
  562 static void
  563 snprintf_func(int ch, void *arg)
  564 {
  565         struct snprintf_arg *const info = arg;
  566 
  567         if (info->remain >= 2) {
  568                 *info->str++ = ch;
  569                 info->remain--;
  570         }
  571 }
  572 
  573 /*
  574  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
  575  * order; return an optional length and a pointer to the last character
  576  * written in the buffer (i.e., the first character of the string).
  577  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
  578  */
  579 static char *
  580 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
  581 {
  582         char *p, c;
  583 
  584         p = nbuf;
  585         *p = '\0';
  586         do {
  587                 c = hex2ascii(num % base);
  588                 *++p = upper ? toupper(c) : c;
  589         } while (num /= base);
  590         if (lenp)
  591                 *lenp = p - nbuf;
  592         return (p);
  593 }
  594 
  595 /*
  596  * Scaled down version of printf(3).
  597  *
  598  * Two additional formats:
  599  *
  600  * The format %b is supported to decode error registers.
  601  * Its usage is:
  602  *
  603  *      printf("reg=%b\n", regval, "<base><arg>*");
  604  *
  605  * where <base> is the output base expressed as a control character, e.g.
  606  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
  607  * the first of which gives the bit number to be inspected (origin 1), and
  608  * the next characters (up to a control character, i.e. a character <= 32),
  609  * give the name of the register.  Thus:
  610  *
  611  *      kvprintf("reg=%b\n", 3, "\1\2BITTWO\1BITONE\n");
  612  *
  613  * would produce output:
  614  *
  615  *      reg=3<BITTWO,BITONE>
  616  *
  617  * XXX:  %D  -- Hexdump, takes pointer and separator string:
  618  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
  619  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
  620  */
  621 int
  622 kvprintf(char const *fmt, void (*func)(int, void*), void *arg, int radix, va_list ap)
  623 {
  624 #define PCHAR(c) {int cc=(c); if (func) (*func)(cc,arg); else *d++ = cc; retval++; }
  625         char nbuf[MAXNBUF];
  626         char *d;
  627         const char *p, *percent, *q;
  628         u_char *up;
  629         int ch, n;
  630         uintmax_t num;
  631         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
  632         int cflag, hflag, jflag, tflag, zflag;
  633         int dwidth, upper;
  634         char padc;
  635         int stop = 0, retval = 0;
  636 
  637         num = 0;
  638         if (!func)
  639                 d = (char *) arg;
  640         else
  641                 d = NULL;
  642 
  643         if (fmt == NULL)
  644                 fmt = "(fmt null)\n";
  645 
  646         if (radix < 2 || radix > 36)
  647                 radix = 10;
  648 
  649         for (;;) {
  650                 padc = ' ';
  651                 width = 0;
  652                 while ((ch = (u_char)*fmt++) != '%' || stop) {
  653                         if (ch == '\0')
  654                                 return (retval);
  655                         PCHAR(ch);
  656                 }
  657                 percent = fmt - 1;
  658                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
  659                 sign = 0; dot = 0; dwidth = 0; upper = 0;
  660                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
  661 reswitch:       switch (ch = (u_char)*fmt++) {
  662                 case '.':
  663                         dot = 1;
  664                         goto reswitch;
  665                 case '#':
  666                         sharpflag = 1;
  667                         goto reswitch;
  668                 case '+':
  669                         sign = 1;
  670                         goto reswitch;
  671                 case '-':
  672                         ladjust = 1;
  673                         goto reswitch;
  674                 case '%':
  675                         PCHAR(ch);
  676                         break;
  677                 case '*':
  678                         if (!dot) {
  679                                 width = va_arg(ap, int);
  680                                 if (width < 0) {
  681                                         ladjust = !ladjust;
  682                                         width = -width;
  683                                 }
  684                         } else {
  685                                 dwidth = va_arg(ap, int);
  686                         }
  687                         goto reswitch;
  688                 case '':
  689                         if (!dot) {
  690                                 padc = '';
  691                                 goto reswitch;
  692                         }
  693                 case '1': case '2': case '3': case '4':
  694                 case '5': case '6': case '7': case '8': case '9':
  695                                 for (n = 0;; ++fmt) {
  696                                         n = n * 10 + ch - '';
  697                                         ch = *fmt;
  698                                         if (ch < '' || ch > '9')
  699                                                 break;
  700                                 }
  701                         if (dot)
  702                                 dwidth = n;
  703                         else
  704                                 width = n;
  705                         goto reswitch;
  706                 case 'b':
  707                         num = (u_int)va_arg(ap, int);
  708                         p = va_arg(ap, char *);
  709                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
  710                                 PCHAR(*q--);
  711 
  712                         if (num == 0)
  713                                 break;
  714 
  715                         for (tmp = 0; *p;) {
  716                                 n = *p++;
  717                                 if (num & (1 << (n - 1))) {
  718                                         PCHAR(tmp ? ',' : '<');
  719                                         for (; (n = *p) > ' '; ++p)
  720                                                 PCHAR(n);
  721                                         tmp = 1;
  722                                 } else
  723                                         for (; *p > ' '; ++p)
  724                                                 continue;
  725                         }
  726                         if (tmp)
  727                                 PCHAR('>');
  728                         break;
  729                 case 'c':
  730                         PCHAR(va_arg(ap, int));
  731                         break;
  732                 case 'D':
  733                         up = va_arg(ap, u_char *);
  734                         p = va_arg(ap, char *);
  735                         if (!width)
  736                                 width = 16;
  737                         while(width--) {
  738                                 PCHAR(hex2ascii(*up >> 4));
  739                                 PCHAR(hex2ascii(*up & 0x0f));
  740                                 up++;
  741                                 if (width)
  742                                         for (q=p;*q;q++)
  743                                                 PCHAR(*q);
  744                         }
  745                         break;
  746                 case 'd':
  747                 case 'i':
  748                         base = 10;
  749                         sign = 1;
  750                         goto handle_sign;
  751                 case 'h':
  752                         if (hflag) {
  753                                 hflag = 0;
  754                                 cflag = 1;
  755                         } else
  756                                 hflag = 1;
  757                         goto reswitch;
  758                 case 'j':
  759                         jflag = 1;
  760                         goto reswitch;
  761                 case 'l':
  762                         if (lflag) {
  763                                 lflag = 0;
  764                                 qflag = 1;
  765                         } else
  766                                 lflag = 1;
  767                         goto reswitch;
  768                 case 'n':
  769                         if (jflag)
  770                                 *(va_arg(ap, intmax_t *)) = retval;
  771                         else if (qflag)
  772                                 *(va_arg(ap, quad_t *)) = retval;
  773                         else if (lflag)
  774                                 *(va_arg(ap, long *)) = retval;
  775                         else if (zflag)
  776                                 *(va_arg(ap, size_t *)) = retval;
  777                         else if (hflag)
  778                                 *(va_arg(ap, short *)) = retval;
  779                         else if (cflag)
  780                                 *(va_arg(ap, char *)) = retval;
  781                         else
  782                                 *(va_arg(ap, int *)) = retval;
  783                         break;
  784                 case 'o':
  785                         base = 8;
  786                         goto handle_nosign;
  787                 case 'p':
  788                         base = 16;
  789                         sharpflag = (width == 0);
  790                         sign = 0;
  791                         num = (uintptr_t)va_arg(ap, void *);
  792                         goto number;
  793                 case 'q':
  794                         qflag = 1;
  795                         goto reswitch;
  796                 case 'r':
  797                         base = radix;
  798                         if (sign)
  799                                 goto handle_sign;
  800                         goto handle_nosign;
  801                 case 's':
  802                         p = va_arg(ap, char *);
  803                         if (p == NULL)
  804                                 p = "(null)";
  805                         if (!dot)
  806                                 n = strlen (p);
  807                         else
  808                                 for (n = 0; n < dwidth && p[n]; n++)
  809                                         continue;
  810 
  811                         width -= n;
  812 
  813                         if (!ladjust && width > 0)
  814                                 while (width--)
  815                                         PCHAR(padc);
  816                         while (n--)
  817                                 PCHAR(*p++);
  818                         if (ladjust && width > 0)
  819                                 while (width--)
  820                                         PCHAR(padc);
  821                         break;
  822                 case 't':
  823                         tflag = 1;
  824                         goto reswitch;
  825                 case 'u':
  826                         base = 10;
  827                         goto handle_nosign;
  828                 case 'X':
  829                         upper = 1;
  830                 case 'x':
  831                         base = 16;
  832                         goto handle_nosign;
  833                 case 'y':
  834                         base = 16;
  835                         sign = 1;
  836                         goto handle_sign;
  837                 case 'z':
  838                         zflag = 1;
  839                         goto reswitch;
  840 handle_nosign:
  841                         sign = 0;
  842                         if (jflag)
  843                                 num = va_arg(ap, uintmax_t);
  844                         else if (qflag)
  845                                 num = va_arg(ap, u_quad_t);
  846                         else if (tflag)
  847                                 num = va_arg(ap, ptrdiff_t);
  848                         else if (lflag)
  849                                 num = va_arg(ap, u_long);
  850                         else if (zflag)
  851                                 num = va_arg(ap, size_t);
  852                         else if (hflag)
  853                                 num = (u_short)va_arg(ap, int);
  854                         else if (cflag)
  855                                 num = (u_char)va_arg(ap, int);
  856                         else
  857                                 num = va_arg(ap, u_int);
  858                         goto number;
  859 handle_sign:
  860                         if (jflag)
  861                                 num = va_arg(ap, intmax_t);
  862                         else if (qflag)
  863                                 num = va_arg(ap, quad_t);
  864                         else if (tflag)
  865                                 num = va_arg(ap, ptrdiff_t);
  866                         else if (lflag)
  867                                 num = va_arg(ap, long);
  868                         else if (zflag)
  869                                 num = va_arg(ap, ssize_t);
  870                         else if (hflag)
  871                                 num = (short)va_arg(ap, int);
  872                         else if (cflag)
  873                                 num = (char)va_arg(ap, int);
  874                         else
  875                                 num = va_arg(ap, int);
  876 number:
  877                         if (sign && (intmax_t)num < 0) {
  878                                 neg = 1;
  879                                 num = -(intmax_t)num;
  880                         }
  881                         p = ksprintn(nbuf, num, base, &n, upper);
  882                         tmp = 0;
  883                         if (sharpflag && num != 0) {
  884                                 if (base == 8)
  885                                         tmp++;
  886                                 else if (base == 16)
  887                                         tmp += 2;
  888                         }
  889                         if (neg)
  890                                 tmp++;
  891 
  892                         if (!ladjust && padc == '')
  893                                 dwidth = width - tmp;
  894                         width -= tmp + imax(dwidth, n);
  895                         dwidth -= n;
  896                         if (!ladjust)
  897                                 while (width-- > 0)
  898                                         PCHAR(' ');
  899                         if (neg)
  900                                 PCHAR('-');
  901                         if (sharpflag && num != 0) {
  902                                 if (base == 8) {
  903                                         PCHAR('');
  904                                 } else if (base == 16) {
  905                                         PCHAR('');
  906                                         PCHAR('x');
  907                                 }
  908                         }
  909                         while (dwidth-- > 0)
  910                                 PCHAR('');
  911 
  912                         while (*p)
  913                                 PCHAR(*p--);
  914 
  915                         if (ladjust)
  916                                 while (width-- > 0)
  917                                         PCHAR(' ');
  918 
  919                         break;
  920                 default:
  921                         while (percent < fmt)
  922                                 PCHAR(*percent++);
  923                         /*
  924                          * Since we ignore a formatting argument it is no 
  925                          * longer safe to obey the remaining formatting
  926                          * arguments as the arguments will no longer match
  927                          * the format specs.
  928                          */
  929                         stop = 1;
  930                         break;
  931                 }
  932         }
  933 #undef PCHAR
  934 }
  935 
  936 /*
  937  * Put character in log buffer with a particular priority.
  938  */
  939 static void
  940 msglogchar(int c, int pri)
  941 {
  942         static int lastpri = -1;
  943         static int dangling;
  944         char nbuf[MAXNBUF];
  945         char *p;
  946 
  947         if (!msgbufmapped)
  948                 return;
  949         if (c == '\0' || c == '\r')
  950                 return;
  951         if (pri != -1 && pri != lastpri) {
  952                 if (dangling) {
  953                         msgbuf_addchar(msgbufp, '\n');
  954                         dangling = 0;
  955                 }
  956                 msgbuf_addchar(msgbufp, '<');
  957                 for (p = ksprintn(nbuf, (uintmax_t)pri, 10, NULL, 0); *p;)
  958                         msgbuf_addchar(msgbufp, *p--);
  959                 msgbuf_addchar(msgbufp, '>');
  960                 lastpri = pri;
  961         }
  962         msgbuf_addchar(msgbufp, c);
  963         if (c == '\n') {
  964                 dangling = 0;
  965                 lastpri = -1;
  966         } else {
  967                 dangling = 1;
  968         }
  969 }
  970 
  971 static void
  972 msglogstr(char *str, int pri, int filter_cr)
  973 {
  974         if (!msgbufmapped)
  975                 return;
  976 
  977         msgbuf_addstr(msgbufp, pri, str, filter_cr);
  978 }
  979 
  980 void
  981 msgbufinit(void *ptr, int size)
  982 {
  983         char *cp;
  984         static struct msgbuf *oldp = NULL;
  985 
  986         size -= sizeof(*msgbufp);
  987         cp = (char *)ptr;
  988         msgbufp = (struct msgbuf *)(cp + size);
  989         msgbuf_reinit(msgbufp, cp, size);
  990         if (msgbufmapped && oldp != msgbufp)
  991                 msgbuf_copy(oldp, msgbufp);
  992         msgbufmapped = 1;
  993         oldp = msgbufp;
  994 }
  995 
  996 static int unprivileged_read_msgbuf = 1;
  997 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_read_msgbuf,
  998     CTLFLAG_RW, &unprivileged_read_msgbuf, 0,
  999     "Unprivileged processes may read the kernel message buffer");
 1000 
 1001 /* Sysctls for accessing/clearing the msgbuf */
 1002 static int
 1003 sysctl_kern_msgbuf(SYSCTL_HANDLER_ARGS)
 1004 {
 1005         char buf[128];
 1006         u_int seq;
 1007         int error, len;
 1008 
 1009         if (!unprivileged_read_msgbuf) {
 1010                 error = priv_check(req->td, PRIV_MSGBUF);
 1011                 if (error)
 1012                         return (error);
 1013         }
 1014 
 1015         /* Read the whole buffer, one chunk at a time. */
 1016         mtx_lock(&msgbuf_lock);
 1017         msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
 1018         for (;;) {
 1019                 len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq);
 1020                 mtx_unlock(&msgbuf_lock);
 1021                 if (len == 0)
 1022                         return (0);
 1023 
 1024                 error = sysctl_handle_opaque(oidp, buf, len, req);
 1025                 if (error)
 1026                         return (error);
 1027 
 1028                 mtx_lock(&msgbuf_lock);
 1029         }
 1030 }
 1031 
 1032 SYSCTL_PROC(_kern, OID_AUTO, msgbuf,
 1033     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
 1034     NULL, 0, sysctl_kern_msgbuf, "A", "Contents of kernel message buffer");
 1035 
 1036 static int msgbuf_clearflag;
 1037 
 1038 static int
 1039 sysctl_kern_msgbuf_clear(SYSCTL_HANDLER_ARGS)
 1040 {
 1041         int error;
 1042         error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
 1043         if (!error && req->newptr) {
 1044                 mtx_lock(&msgbuf_lock);
 1045                 msgbuf_clear(msgbufp);
 1046                 mtx_unlock(&msgbuf_lock);
 1047                 msgbuf_clearflag = 0;
 1048         }
 1049         return (error);
 1050 }
 1051 
 1052 SYSCTL_PROC(_kern, OID_AUTO, msgbuf_clear,
 1053     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE | CTLFLAG_MPSAFE,
 1054     &msgbuf_clearflag, 0, sysctl_kern_msgbuf_clear, "I",
 1055     "Clear kernel message buffer");
 1056 
 1057 #ifdef DDB
 1058 
 1059 DB_SHOW_COMMAND(msgbuf, db_show_msgbuf)
 1060 {
 1061         int i, j;
 1062 
 1063         if (!msgbufmapped) {
 1064                 db_printf("msgbuf not mapped yet\n");
 1065                 return;
 1066         }
 1067         db_printf("msgbufp = %p\n", msgbufp);
 1068         db_printf("magic = %x, size = %d, r= %u, w = %u, ptr = %p, cksum= %u\n",
 1069             msgbufp->msg_magic, msgbufp->msg_size, msgbufp->msg_rseq,
 1070             msgbufp->msg_wseq, msgbufp->msg_ptr, msgbufp->msg_cksum);
 1071         for (i = 0; i < msgbufp->msg_size && !db_pager_quit; i++) {
 1072                 j = MSGBUF_SEQ_TO_POS(msgbufp, i + msgbufp->msg_rseq);
 1073                 db_printf("%c", msgbufp->msg_ptr[j]);
 1074         }
 1075         db_printf("\n");
 1076 }
 1077 
 1078 #endif /* DDB */
 1079 
 1080 void
 1081 hexdump(const void *ptr, int length, const char *hdr, int flags)
 1082 {
 1083         int i, j, k;
 1084         int cols;
 1085         const unsigned char *cp;
 1086         char delim;
 1087 
 1088         if ((flags & HD_DELIM_MASK) != 0)
 1089                 delim = (flags & HD_DELIM_MASK) >> 8;
 1090         else
 1091                 delim = ' ';
 1092 
 1093         if ((flags & HD_COLUMN_MASK) != 0)
 1094                 cols = flags & HD_COLUMN_MASK;
 1095         else
 1096                 cols = 16;
 1097 
 1098         cp = ptr;
 1099         for (i = 0; i < length; i+= cols) {
 1100                 if (hdr != NULL)
 1101                         printf("%s", hdr);
 1102 
 1103                 if ((flags & HD_OMIT_COUNT) == 0)
 1104                         printf("%04x  ", i);
 1105 
 1106                 if ((flags & HD_OMIT_HEX) == 0) {
 1107                         for (j = 0; j < cols; j++) {
 1108                                 k = i + j;
 1109                                 if (k < length)
 1110                                         printf("%c%02x", delim, cp[k]);
 1111                                 else
 1112                                         printf("   ");
 1113                         }
 1114                 }
 1115 
 1116                 if ((flags & HD_OMIT_CHARS) == 0) {
 1117                         printf("  |");
 1118                         for (j = 0; j < cols; j++) {
 1119                                 k = i + j;
 1120                                 if (k >= length)
 1121                                         printf(" ");
 1122                                 else if (cp[k] >= ' ' && cp[k] <= '~')
 1123                                         printf("%c", cp[k]);
 1124                                 else
 1125                                         printf(".");
 1126                         }
 1127                         printf("|");
 1128                 }
 1129                 printf("\n");
 1130         }
 1131 }
 1132 #endif /* _KERNEL */
 1133 
 1134 void
 1135 sbuf_hexdump(struct sbuf *sb, const void *ptr, int length, const char *hdr,
 1136              int flags)
 1137 {
 1138         int i, j, k;
 1139         int cols;
 1140         const unsigned char *cp;
 1141         char delim;
 1142 
 1143         if ((flags & HD_DELIM_MASK) != 0)
 1144                 delim = (flags & HD_DELIM_MASK) >> 8;
 1145         else
 1146                 delim = ' ';
 1147 
 1148         if ((flags & HD_COLUMN_MASK) != 0)
 1149                 cols = flags & HD_COLUMN_MASK;
 1150         else
 1151                 cols = 16;
 1152 
 1153         cp = ptr;
 1154         for (i = 0; i < length; i+= cols) {
 1155                 if (hdr != NULL)
 1156                         sbuf_printf(sb, "%s", hdr);
 1157 
 1158                 if ((flags & HD_OMIT_COUNT) == 0)
 1159                         sbuf_printf(sb, "%04x  ", i);
 1160 
 1161                 if ((flags & HD_OMIT_HEX) == 0) {
 1162                         for (j = 0; j < cols; j++) {
 1163                                 k = i + j;
 1164                                 if (k < length)
 1165                                         sbuf_printf(sb, "%c%02x", delim, cp[k]);
 1166                                 else
 1167                                         sbuf_printf(sb, "   ");
 1168                         }
 1169                 }
 1170 
 1171                 if ((flags & HD_OMIT_CHARS) == 0) {
 1172                         sbuf_printf(sb, "  |");
 1173                         for (j = 0; j < cols; j++) {
 1174                                 k = i + j;
 1175                                 if (k >= length)
 1176                                         sbuf_printf(sb, " ");
 1177                                 else if (cp[k] >= ' ' && cp[k] <= '~')
 1178                                         sbuf_printf(sb, "%c", cp[k]);
 1179                                 else
 1180                                         sbuf_printf(sb, ".");
 1181                         }
 1182                         sbuf_printf(sb, "|");
 1183                 }
 1184                 sbuf_printf(sb, "\n");
 1185         }
 1186 }
 1187
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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_prf.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_prf.c
