subr_prf.c revision 1.21
1 /* $NetBSD: subr_prf.c,v 1.21 1996/02/09 19:00:01 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1986, 1988, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)subr_prf.c 8.3 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/buf.h> 46 #include <sys/conf.h> 47 #include <sys/reboot.h> 48 #include <sys/msgbuf.h> 49 #include <sys/proc.h> 50 #include <sys/ioctl.h> 51 #include <sys/vnode.h> 52 #include <sys/file.h> 53 #include <sys/tty.h> 54 #include <sys/tprintf.h> 55 #include <sys/syslog.h> 56 #include <sys/malloc.h> 57 58 #include <dev/cons.h> 59 60 /* 61 * Note that stdarg.h and the ANSI style va_start macro is used for both 62 * ANSI and traditional C compilers. 63 */ 64 #include <machine/stdarg.h> 65 66 #ifdef KADB 67 #include <machine/kdbparam.h> 68 #endif 69 70 #define TOCONS 0x01 71 #define TOTTY 0x02 72 #define TOLOG 0x04 73 74 struct tty *constty; /* pointer to console "window" tty */ 75 76 void (*v_putc) __P((int)) = cnputc; /* routine to putc on virtual console */ 77 78 static void putchar __P((int, int, struct tty *)); 79 static char *ksprintn __P((u_long, int, int *)); 80 void kprintf __P((const char *, int, struct tty *, va_list)); 81 82 int consintr = 1; /* Ok to handle console interrupts? */ 83 84 /* 85 * Variable panicstr contains argument to first call to panic; used as flag 86 * to indicate that the kernel has already called panic. 87 */ 88 const char *panicstr; 89 90 /* 91 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 92 * and then reboots. If we are called twice, then we avoid trying to sync 93 * the disks as this often leads to recursive panics. 94 */ 95 #ifdef __GNUC__ 96 volatile void boot(int flags); /* boot() does not return */ 97 volatile /* panic() does not return */ 98 #endif 99 void 100 #ifdef __STDC__ 101 panic(const char *fmt, ...) 102 #else 103 panic(fmt, va_alist) 104 char *fmt; 105 va_dcl 106 #endif 107 { 108 int bootopt; 109 va_list ap; 110 static const char fm[] = "panic: %r\n"; 111 112 bootopt = RB_AUTOBOOT | RB_DUMP; 113 if (panicstr) 114 bootopt |= RB_NOSYNC; 115 else 116 panicstr = fmt; 117 118 va_start(ap, fmt); 119 printf(fm, fmt, ap); 120 va_end(ap); 121 122 #ifdef KGDB 123 kgdb_panic(); 124 #endif 125 #ifdef KADB 126 if (boothowto & RB_KDB) 127 kdbpanic(); 128 #endif 129 #ifdef DDB 130 Debugger(); 131 #endif 132 boot(bootopt); 133 } 134 135 /* 136 * Warn that a system table is full. 137 */ 138 void 139 tablefull(tab) 140 const char *tab; 141 { 142 143 log(LOG_ERR, "%s: table is full\n", tab); 144 } 145 146 /* 147 * Uprintf prints to the controlling terminal for the current process. 148 * It may block if the tty queue is overfull. No message is printed if 149 * the queue does not clear in a reasonable time. 150 */ 151 void 152 #ifdef __STDC__ 153 uprintf(const char *fmt, ...) 154 #else 155 uprintf(fmt, va_alist) 156 char *fmt; 157 va_dcl 158 #endif 159 { 160 register struct proc *p = curproc; 161 va_list ap; 162 163 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 164 va_start(ap, fmt); 165 kprintf(fmt, TOTTY, p->p_session->s_ttyp, ap); 166 va_end(ap); 167 } 168 } 169 170 tpr_t 171 tprintf_open(p) 172 register struct proc *p; 173 { 174 175 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 176 SESSHOLD(p->p_session); 177 return ((tpr_t) p->p_session); 178 } 179 return ((tpr_t) NULL); 180 } 181 182 void 183 tprintf_close(sess) 184 tpr_t sess; 185 { 186 187 if (sess) 188 SESSRELE((struct session *) sess); 189 } 190 191 /* 192 * tprintf prints on the controlling terminal associated 193 * with the given session. 194 */ 195 void 196 #ifdef __STDC__ 197 tprintf(tpr_t tpr, const char *fmt, ...) 198 #else 199 tprintf(tpr, fmt, va_alist) 200 tpr_t tpr; 201 char *fmt; 202 va_dcl 203 #endif 204 { 205 register struct session *sess = (struct session *)tpr; 206 struct tty *tp = NULL; 207 int flags = TOLOG; 208 va_list ap; 209 210 logpri(LOG_INFO); 211 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 212 flags |= TOTTY; 213 tp = sess->s_ttyp; 214 } 215 va_start(ap, fmt); 216 kprintf(fmt, flags, tp, ap); 217 va_end(ap); 218 logwakeup(); 219 } 220 221 /* 222 * Ttyprintf displays a message on a tty; it should be used only by 223 * the tty driver, or anything that knows the underlying tty will not 224 * be revoke(2)'d away. Other callers should use tprintf. 225 */ 226 void 227 #ifdef __STDC__ 228 ttyprintf(struct tty *tp, const char *fmt, ...) 229 #else 230 ttyprintf(tp, fmt, va_alist) 231 struct tty *tp; 232 char *fmt; 233 va_dcl 234 #endif 235 { 236 va_list ap; 237 238 va_start(ap, fmt); 239 kprintf(fmt, TOTTY, tp, ap); 240 va_end(ap); 241 } 242 243 extern int log_open; 244 245 /* 246 * Log writes to the log buffer, and guarantees not to sleep (so can be 247 * called by interrupt routines). If there is no process reading the 248 * log yet, it writes to the console also. 249 */ 250 void 251 #ifdef __STDC__ 252 log(int level, const char *fmt, ...) 253 #else 254 log(level, fmt, va_alist) 255 int level; 256 char *fmt; 257 va_dcl 258 #endif 259 { 260 register int s; 261 va_list ap; 262 263 s = splhigh(); 264 logpri(level); 265 va_start(ap, fmt); 266 kprintf(fmt, TOLOG, NULL, ap); 267 splx(s); 268 va_end(ap); 269 if (!log_open) { 270 va_start(ap, fmt); 271 kprintf(fmt, TOCONS, NULL, ap); 272 va_end(ap); 273 } 274 logwakeup(); 275 } 276 277 void 278 logpri(level) 279 int level; 280 { 281 register int ch; 282 register char *p; 283 284 putchar('<', TOLOG, NULL); 285 for (p = ksprintn((u_long)level, 10, NULL); (ch = *p--) != 0;) 286 putchar(ch, TOLOG, NULL); 287 putchar('>', TOLOG, NULL); 288 } 289 290 void 291 #ifdef __STDC__ 292 addlog(const char *fmt, ...) 293 #else 294 addlog(fmt, va_alist) 295 char *fmt; 296 va_dcl 297 #endif 298 { 299 register int s; 300 va_list ap; 301 302 s = splhigh(); 303 va_start(ap, fmt); 304 kprintf(fmt, TOLOG, NULL, ap); 305 splx(s); 306 va_end(ap); 307 if (!log_open) { 308 va_start(ap, fmt); 309 kprintf(fmt, TOCONS, NULL, ap); 310 va_end(ap); 311 } 312 logwakeup(); 313 } 314 315 void 316 #ifdef __STDC__ 317 printf(const char *fmt, ...) 318 #else 319 printf(fmt, va_alist) 320 char *fmt; 321 va_dcl 322 #endif 323 { 324 va_list ap; 325 register int savintr; 326 327 savintr = consintr; /* disable interrupts */ 328 consintr = 0; 329 va_start(ap, fmt); 330 kprintf(fmt, TOCONS | TOLOG, NULL, ap); 331 va_end(ap); 332 if (!panicstr) 333 logwakeup(); 334 consintr = savintr; /* reenable interrupts */ 335 } 336 337 /* 338 * Scaled down version of printf(3). 339 * 340 * Two additional formats: 341 * 342 * The format %b is supported to decode error registers. 343 * Its usage is: 344 * 345 * printf("reg=%b\n", regval, "<base><arg>*"); 346 * 347 * where <base> is the output base expressed as a control character, e.g. 348 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 349 * the first of which gives the bit number to be inspected (origin 1), and 350 * the next characters (up to a control character, i.e. a character <= 32), 351 * give the name of the register. Thus: 352 * 353 * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 354 * 355 * would produce output: 356 * 357 * reg=3<BITTWO,BITONE> 358 * 359 * The format %r passes an additional format string and argument list 360 * recursively. Its usage is: 361 * 362 * fn(char *fmt, ...) 363 * { 364 * va_list ap; 365 * va_start(ap, fmt); 366 * printf("prefix: %r: suffix\n", fmt, ap); 367 * va_end(ap); 368 * } 369 * 370 * Space or zero padding and a field width are supported for the numeric 371 * formats only. 372 */ 373 void 374 kprintf(fmt, flags, tp, ap) 375 register const char *fmt; 376 int flags; 377 struct tty *tp; 378 va_list ap; 379 { 380 register char *p, *q; 381 register int ch, n; 382 u_long ul; 383 int base, lflag, tmp, width; 384 char padc; 385 386 for (;;) { 387 padc = ' '; 388 width = 0; 389 while ((ch = *(u_char *)fmt++) != '%') { 390 if (ch == '\0') 391 return; 392 putchar(ch, flags, tp); 393 } 394 lflag = 0; 395 reswitch: switch (ch = *(u_char *)fmt++) { 396 case '0': 397 padc = '0'; 398 goto reswitch; 399 case '1': case '2': case '3': case '4': 400 case '5': case '6': case '7': case '8': case '9': 401 for (width = 0;; ++fmt) { 402 width = width * 10 + ch - '0'; 403 ch = *fmt; 404 if (ch < '0' || ch > '9') 405 break; 406 } 407 goto reswitch; 408 case 'l': 409 lflag = 1; 410 goto reswitch; 411 case 'b': 412 ul = va_arg(ap, int); 413 p = va_arg(ap, char *); 414 for (q = ksprintn(ul, *p++, NULL); (ch = *q--) != 0;) 415 putchar(ch, flags, tp); 416 417 if (!ul) 418 break; 419 420 for (tmp = 0; (n = *p++) != 0;) { 421 if (ul & (1 << (n - 1))) { 422 putchar(tmp ? ',' : '<', flags, tp); 423 for (; (n = *p) > ' '; ++p) 424 putchar(n, flags, tp); 425 tmp = 1; 426 } else 427 for (; *p > ' '; ++p) 428 continue; 429 } 430 if (tmp) 431 putchar('>', flags, tp); 432 break; 433 case 'c': 434 putchar(va_arg(ap, int), flags, tp); 435 break; 436 case 'r': 437 p = va_arg(ap, char *); 438 kprintf(p, flags, tp, va_arg(ap, va_list)); 439 break; 440 case 's': 441 if ((p = va_arg(ap, char *)) == NULL) 442 p = "(null)"; 443 while ((ch = *p++) != 0) 444 putchar(ch, flags, tp); 445 break; 446 case 'd': 447 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 448 if ((long)ul < 0) { 449 putchar('-', flags, tp); 450 ul = -(long)ul; 451 } 452 base = 10; 453 goto number; 454 case 'o': 455 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 456 base = 8; 457 goto number; 458 case 'u': 459 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 460 base = 10; 461 goto number; 462 case 'p': 463 putchar('0', flags, tp); 464 putchar('x', flags, tp); 465 ul = (u_long)va_arg(ap, void *); 466 base = 16; 467 goto number; 468 case 'x': 469 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 470 base = 16; 471 number: p = ksprintn(ul, base, &tmp); 472 if (width && (width -= tmp) > 0) 473 while (width--) 474 putchar(padc, flags, tp); 475 while ((ch = *p--) != 0) 476 putchar(ch, flags, tp); 477 break; 478 default: 479 putchar('%', flags, tp); 480 if (lflag) 481 putchar('l', flags, tp); 482 /* FALLTHROUGH */ 483 case '%': 484 putchar(ch, flags, tp); 485 } 486 } 487 } 488 489 /* 490 * Print a character on console or users terminal. If destination is 491 * the console then the last MSGBUFS characters are saved in msgbuf for 492 * inspection later. 493 */ 494 static void 495 putchar(c, flags, tp) 496 register int c; 497 int flags; 498 struct tty *tp; 499 { 500 extern int msgbufmapped; 501 register struct msgbuf *mbp; 502 503 if (panicstr) 504 constty = NULL; 505 if ((flags & TOCONS) && tp == NULL && constty) { 506 tp = constty; 507 flags |= TOTTY; 508 } 509 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 510 (flags & TOCONS) && tp == constty) 511 constty = NULL; 512 if ((flags & TOLOG) && 513 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { 514 mbp = msgbufp; 515 if (mbp->msg_magic != MSG_MAGIC) { 516 bzero((caddr_t)mbp, sizeof(*mbp)); 517 mbp->msg_magic = MSG_MAGIC; 518 } 519 mbp->msg_bufc[mbp->msg_bufx++] = c; 520 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE) 521 mbp->msg_bufx = 0; 522 } 523 if ((flags & TOCONS) && constty == NULL && c != '\0') 524 (*v_putc)(c); 525 } 526 527 /* 528 * Scaled down version of sprintf(3). 529 */ 530 int 531 #ifdef __STDC__ 532 sprintf(char *buf, const char *cfmt, ...) 533 #else 534 sprintf(buf, cfmt, va_alist) 535 char *buf, *cfmt; 536 va_dcl 537 #endif 538 { 539 register const char *fmt = cfmt; 540 register char *p, *bp; 541 register int ch, base; 542 u_long ul; 543 int lflag, tmp, width; 544 va_list ap; 545 char padc; 546 547 va_start(ap, cfmt); 548 for (bp = buf; ; ) { 549 padc = ' '; 550 width = 0; 551 while ((ch = *(u_char *)fmt++) != '%') 552 if ((*bp++ = ch) == '\0') 553 return ((bp - buf) - 1); 554 555 lflag = 0; 556 reswitch: switch (ch = *(u_char *)fmt++) { 557 case '0': 558 padc = '0'; 559 goto reswitch; 560 case '1': case '2': case '3': case '4': 561 case '5': case '6': case '7': case '8': case '9': 562 for (width = 0;; ++fmt) { 563 width = width * 10 + ch - '0'; 564 ch = *fmt; 565 if (ch < '0' || ch > '9') 566 break; 567 } 568 goto reswitch; 569 case 'l': 570 lflag = 1; 571 goto reswitch; 572 /* case 'b': ... break; XXX */ 573 case 'c': 574 *bp++ = va_arg(ap, int); 575 break; 576 /* case 'r': ... break; XXX */ 577 case 's': 578 p = va_arg(ap, char *); 579 while ((*bp++ = *p++) != 0) 580 continue; 581 --bp; 582 break; 583 case 'd': 584 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 585 if ((long)ul < 0) { 586 *bp++ = '-'; 587 ul = -(long)ul; 588 } 589 base = 10; 590 goto number; 591 break; 592 case 'o': 593 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 594 base = 8; 595 goto number; 596 break; 597 case 'u': 598 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 599 base = 10; 600 goto number; 601 break; 602 case 'p': 603 *bp++ = '0'; 604 *bp++ = 'x'; 605 ul = (u_long)va_arg(ap, void *); 606 base = 16; 607 goto number; 608 case 'x': 609 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 610 base = 16; 611 number: p = ksprintn(ul, base, &tmp); 612 if (width && (width -= tmp) > 0) 613 while (width--) 614 *bp++ = padc; 615 while ((ch = *p--) != 0) 616 *bp++ = ch; 617 break; 618 default: 619 *bp++ = '%'; 620 if (lflag) 621 *bp++ = 'l'; 622 /* FALLTHROUGH */ 623 case '%': 624 *bp++ = ch; 625 } 626 } 627 va_end(ap); 628 } 629 630 /* 631 * Put a number (base <= 16) in a buffer in reverse order; return an 632 * optional length and a pointer to the NULL terminated (preceded?) 633 * buffer. 634 */ 635 static char * 636 ksprintn(ul, base, lenp) 637 register u_long ul; 638 register int base, *lenp; 639 { /* A long in base 8, plus NULL. */ 640 static char buf[sizeof(long) * NBBY / 3 + 2]; 641 register char *p; 642 643 p = buf; 644 do { 645 *++p = "0123456789abcdef"[ul % base]; 646 } while (ul /= base); 647 if (lenp) 648 *lenp = p - buf; 649 return (p); 650 } 651
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