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

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