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

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