subr_prf.c revision 1.27
1 /* $NetBSD: subr_prf.c,v 1.27 1996/09/25 21:03:45 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 #ifdef KGDB 70 #include <machine/cpu.h> 71 #endif 72 73 #define TOCONS 0x01 74 #define TOTTY 0x02 75 #define TOLOG 0x04 76 77 struct tty *constty; /* pointer to console "window" tty */ 78 79 void (*v_putc) __P((int)) = cnputc; /* routine to putc on virtual console */ 80 81 static void putchar __P((int, int, struct tty *)); 82 static char *ksprintn __P((u_long, int, int *)); 83 void kprintf __P((const char *, int, struct tty *, va_list)); 84 85 int consintr = 1; /* Ok to handle console interrupts? */ 86 87 /* 88 * Variable panicstr contains argument to first call to panic; used as flag 89 * to indicate that the kernel has already called panic. 90 */ 91 const char *panicstr; 92 93 /* 94 * Panic is called on unresolvable fatal errors. It prints "panic: mesg", 95 * and then reboots. If we are called twice, then we avoid trying to sync 96 * the disks as this often leads to recursive panics. 97 */ 98 void 99 #ifdef __STDC__ 100 panic(const char *fmt, ...) 101 #else 102 panic(fmt, va_alist) 103 char *fmt; 104 va_dcl 105 #endif 106 { 107 int bootopt; 108 va_list ap; 109 110 bootopt = RB_AUTOBOOT | RB_DUMP; 111 if (panicstr) 112 bootopt |= RB_NOSYNC; 113 else 114 panicstr = fmt; 115 116 va_start(ap, fmt); 117 printf("panic: %:\n", fmt, ap); 118 va_end(ap); 119 120 #ifdef KGDB 121 kgdb_panic(); 122 #endif 123 #ifdef KADB 124 if (boothowto & RB_KDB) 125 kdbpanic(); 126 #endif 127 #ifdef DDB 128 Debugger(); 129 #endif 130 boot(bootopt, NULL); 131 } 132 133 /* 134 * Warn that a system table is full. 135 */ 136 void 137 tablefull(tab) 138 const char *tab; 139 { 140 141 log(LOG_ERR, "%s: table is full\n", tab); 142 } 143 144 /* 145 * Uprintf prints to the controlling terminal for the current process. 146 * It may block if the tty queue is overfull. No message is printed if 147 * the queue does not clear in a reasonable time. 148 */ 149 void 150 #ifdef __STDC__ 151 uprintf(const char *fmt, ...) 152 #else 153 uprintf(fmt, va_alist) 154 char *fmt; 155 va_dcl 156 #endif 157 { 158 register struct proc *p = curproc; 159 va_list ap; 160 161 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 162 va_start(ap, fmt); 163 kprintf(fmt, TOTTY, p->p_session->s_ttyp, ap); 164 va_end(ap); 165 } 166 } 167 168 tpr_t 169 tprintf_open(p) 170 register struct proc *p; 171 { 172 173 if (p->p_flag & P_CONTROLT && p->p_session->s_ttyvp) { 174 SESSHOLD(p->p_session); 175 return ((tpr_t) p->p_session); 176 } 177 return ((tpr_t) NULL); 178 } 179 180 void 181 tprintf_close(sess) 182 tpr_t sess; 183 { 184 185 if (sess) 186 SESSRELE((struct session *) sess); 187 } 188 189 /* 190 * tprintf prints on the controlling terminal associated 191 * with the given session. 192 */ 193 void 194 #ifdef __STDC__ 195 tprintf(tpr_t tpr, const char *fmt, ...) 196 #else 197 tprintf(tpr, fmt, va_alist) 198 tpr_t tpr; 199 char *fmt; 200 va_dcl 201 #endif 202 { 203 register struct session *sess = (struct session *)tpr; 204 struct tty *tp = NULL; 205 int flags = TOLOG; 206 va_list ap; 207 208 logpri(LOG_INFO); 209 if (sess && sess->s_ttyvp && ttycheckoutq(sess->s_ttyp, 0)) { 210 flags |= TOTTY; 211 tp = sess->s_ttyp; 212 } 213 va_start(ap, fmt); 214 kprintf(fmt, flags, tp, ap); 215 va_end(ap); 216 logwakeup(); 217 } 218 219 /* 220 * Ttyprintf displays a message on a tty; it should be used only by 221 * the tty driver, or anything that knows the underlying tty will not 222 * be revoke(2)'d away. Other callers should use tprintf. 223 */ 224 void 225 #ifdef __STDC__ 226 ttyprintf(struct tty *tp, const char *fmt, ...) 227 #else 228 ttyprintf(tp, fmt, va_alist) 229 struct tty *tp; 230 char *fmt; 231 va_dcl 232 #endif 233 { 234 va_list ap; 235 236 va_start(ap, fmt); 237 kprintf(fmt, TOTTY, tp, ap); 238 va_end(ap); 239 } 240 241 extern int log_open; 242 243 /* 244 * Log writes to the log buffer, and guarantees not to sleep (so can be 245 * called by interrupt routines). If there is no process reading the 246 * log yet, it writes to the console also. 247 */ 248 void 249 #ifdef __STDC__ 250 log(int level, const char *fmt, ...) 251 #else 252 log(level, fmt, va_alist) 253 int level; 254 char *fmt; 255 va_dcl 256 #endif 257 { 258 register int s; 259 va_list ap; 260 261 s = splhigh(); 262 logpri(level); 263 va_start(ap, fmt); 264 kprintf(fmt, TOLOG, NULL, ap); 265 splx(s); 266 va_end(ap); 267 if (!log_open) { 268 va_start(ap, fmt); 269 kprintf(fmt, TOCONS, NULL, ap); 270 va_end(ap); 271 } 272 logwakeup(); 273 } 274 275 void 276 logpri(level) 277 int level; 278 { 279 register int ch; 280 register char *p; 281 282 putchar('<', TOLOG, NULL); 283 for (p = ksprintn((u_long)level, 10, NULL); (ch = *p--) != 0;) 284 putchar(ch, TOLOG, NULL); 285 putchar('>', TOLOG, NULL); 286 } 287 288 void 289 #ifdef __STDC__ 290 addlog(const char *fmt, ...) 291 #else 292 addlog(fmt, va_alist) 293 char *fmt; 294 va_dcl 295 #endif 296 { 297 register int s; 298 va_list ap; 299 300 s = splhigh(); 301 va_start(ap, fmt); 302 kprintf(fmt, TOLOG, NULL, ap); 303 splx(s); 304 va_end(ap); 305 if (!log_open) { 306 va_start(ap, fmt); 307 kprintf(fmt, TOCONS, NULL, ap); 308 va_end(ap); 309 } 310 logwakeup(); 311 } 312 313 void 314 #ifdef __STDC__ 315 printf(const char *fmt, ...) 316 #else 317 printf(fmt, va_alist) 318 char *fmt; 319 va_dcl 320 #endif 321 { 322 va_list ap; 323 register int savintr; 324 325 savintr = consintr; /* disable interrupts */ 326 consintr = 0; 327 va_start(ap, fmt); 328 kprintf(fmt, TOCONS | TOLOG, NULL, ap); 329 va_end(ap); 330 if (!panicstr) 331 logwakeup(); 332 consintr = savintr; /* reenable interrupts */ 333 } 334 335 /* 336 * Scaled down version of printf(3). 337 * 338 * Two additional formats: 339 * 340 * The format %b is supported to decode error registers. 341 * Its usage is: 342 * 343 * printf("reg=%b\n", regval, "<base><arg>*"); 344 * 345 * where <base> is the output base expressed as a control character, e.g. 346 * \10 gives octal; \20 gives hex. Each arg is a sequence of characters, 347 * the first of which gives the bit number to be inspected (origin 1), and 348 * the next characters (up to a control character, i.e. a character <= 32), 349 * give the name of the register. Thus: 350 * 351 * kprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n"); 352 * 353 * would produce output: 354 * 355 * reg=3<BITTWO,BITONE> 356 * 357 * The format %: passes an additional format string and argument list 358 * recursively. Its usage is: 359 * 360 * fn(char *fmt, ...) 361 * { 362 * va_list ap; 363 * va_start(ap, fmt); 364 * printf("prefix: %: suffix\n", fmt, ap); 365 * va_end(ap); 366 * } 367 * 368 * Space or zero padding and a field width are supported for the numeric 369 * formats only. 370 */ 371 void 372 kprintf(fmt, flags, tp, ap) 373 register const char *fmt; 374 int flags; 375 struct tty *tp; 376 va_list ap; 377 { 378 register char *p, *q; 379 register int ch, n; 380 u_long ul; 381 int base, lflag, tmp, width; 382 char padc; 383 384 for (;;) { 385 padc = ' '; 386 width = 0; 387 while ((ch = *(u_char *)fmt++) != '%') { 388 if (ch == '\0') 389 return; 390 putchar(ch, flags, tp); 391 } 392 lflag = 0; 393 reswitch: switch (ch = *(u_char *)fmt++) { 394 case '0': 395 case '.': 396 padc = '0'; 397 goto reswitch; 398 case '1': case '2': case '3': case '4': 399 case '5': case '6': case '7': case '8': case '9': 400 for (width = 0;; ++fmt) { 401 width = width * 10 + ch - '0'; 402 ch = *fmt; 403 if (ch < '0' || ch > '9') 404 break; 405 } 406 goto reswitch; 407 case 'l': 408 lflag = 1; 409 goto reswitch; 410 case 'b': 411 ul = va_arg(ap, int); 412 p = va_arg(ap, char *); 413 for (q = ksprintn(ul, *p++, NULL); (ch = *q--) != 0;) 414 putchar(ch, flags, tp); 415 416 if (!ul) 417 break; 418 419 for (tmp = 0; (n = *p++) != 0;) { 420 if (ul & (1 << (n - 1))) { 421 putchar(tmp ? ',' : '<', flags, tp); 422 for (; (n = *p) > ' '; ++p) 423 putchar(n, flags, tp); 424 tmp = 1; 425 } else 426 for (; *p > ' '; ++p) 427 continue; 428 } 429 if (tmp) 430 putchar('>', flags, tp); 431 break; 432 case 'c': 433 putchar(va_arg(ap, int), flags, tp); 434 break; 435 case ':': 436 p = va_arg(ap, char *); 437 kprintf(p, flags, tp, va_arg(ap, va_list)); 438 break; 439 case 's': 440 if ((p = va_arg(ap, char *)) == NULL) 441 p = "(null)"; 442 while ((ch = *p++) != 0) 443 putchar(ch, flags, tp); 444 break; 445 case 'd': 446 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 447 if ((long)ul < 0) { 448 putchar('-', flags, tp); 449 ul = -(long)ul; 450 } 451 base = 10; 452 goto number; 453 case 'o': 454 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 455 base = 8; 456 goto number; 457 case 'u': 458 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 459 base = 10; 460 goto number; 461 case 'p': 462 putchar('0', flags, tp); 463 putchar('x', flags, tp); 464 ul = (u_long)va_arg(ap, void *); 465 base = 16; 466 goto number; 467 case 'x': 468 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 469 base = 16; 470 number: p = ksprintn(ul, base, &tmp); 471 if (width && (width -= tmp) > 0) 472 while (width--) 473 putchar(padc, flags, tp); 474 while ((ch = *p--) != 0) 475 putchar(ch, flags, tp); 476 break; 477 default: 478 putchar('%', flags, tp); 479 if (lflag) 480 putchar('l', flags, tp); 481 /* FALLTHROUGH */ 482 case '%': 483 putchar(ch, flags, tp); 484 } 485 } 486 } 487 488 /* 489 * Print a character on console or users terminal. If destination is 490 * the console then the last MSGBUFS characters are saved in msgbuf for 491 * inspection later. 492 */ 493 static void 494 putchar(c, flags, tp) 495 register int c; 496 int flags; 497 struct tty *tp; 498 { 499 extern int msgbufmapped; 500 register struct msgbuf *mbp; 501 502 if (panicstr) 503 constty = NULL; 504 if ((flags & TOCONS) && tp == NULL && constty) { 505 tp = constty; 506 flags |= TOTTY; 507 } 508 if ((flags & TOTTY) && tp && tputchar(c, tp) < 0 && 509 (flags & TOCONS) && tp == constty) 510 constty = NULL; 511 if ((flags & TOLOG) && 512 c != '\0' && c != '\r' && c != 0177 && msgbufmapped) { 513 mbp = msgbufp; 514 if (mbp->msg_magic != MSG_MAGIC) { 515 bzero((caddr_t)mbp, sizeof(*mbp)); 516 mbp->msg_magic = MSG_MAGIC; 517 } 518 mbp->msg_bufc[mbp->msg_bufx++] = c; 519 if (mbp->msg_bufx < 0 || mbp->msg_bufx >= MSG_BSIZE) 520 mbp->msg_bufx = 0; 521 } 522 if ((flags & TOCONS) && constty == NULL && c != '\0') 523 (*v_putc)(c); 524 } 525 526 /* 527 * Scaled down version of sprintf(3). 528 */ 529 int 530 #ifdef __STDC__ 531 sprintf(char *buf, const char *cfmt, ...) 532 #else 533 sprintf(buf, cfmt, va_alist) 534 char *buf, *cfmt; 535 va_dcl 536 #endif 537 { 538 register const char *fmt = cfmt; 539 register char *p, *bp; 540 register int ch, base; 541 u_long ul; 542 int lflag, tmp, width; 543 va_list ap; 544 char padc; 545 546 va_start(ap, cfmt); 547 for (bp = buf; ; ) { 548 padc = ' '; 549 width = 0; 550 while ((ch = *(u_char *)fmt++) != '%') 551 if ((*bp++ = ch) == '\0') 552 return ((bp - buf) - 1); 553 554 lflag = 0; 555 reswitch: switch (ch = *(u_char *)fmt++) { 556 case '0': 557 padc = '0'; 558 goto reswitch; 559 case '1': case '2': case '3': case '4': 560 case '5': case '6': case '7': case '8': case '9': 561 for (width = 0;; ++fmt) { 562 width = width * 10 + ch - '0'; 563 ch = *fmt; 564 if (ch < '0' || ch > '9') 565 break; 566 } 567 goto reswitch; 568 case 'l': 569 lflag = 1; 570 goto reswitch; 571 /* case 'b': ... break; XXX */ 572 case 'c': 573 *bp++ = va_arg(ap, int); 574 break; 575 /* case 'r': ... break; XXX */ 576 case 's': 577 p = va_arg(ap, char *); 578 while ((*bp++ = *p++) != 0) 579 continue; 580 --bp; 581 break; 582 case 'd': 583 ul = lflag ? va_arg(ap, long) : va_arg(ap, int); 584 if ((long)ul < 0) { 585 *bp++ = '-'; 586 ul = -(long)ul; 587 } 588 base = 10; 589 goto number; 590 break; 591 case 'o': 592 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 593 base = 8; 594 goto number; 595 break; 596 case 'u': 597 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 598 base = 10; 599 goto number; 600 break; 601 case 'p': 602 *bp++ = '0'; 603 *bp++ = 'x'; 604 ul = (u_long)va_arg(ap, void *); 605 base = 16; 606 goto number; 607 case 'x': 608 ul = lflag ? va_arg(ap, u_long) : va_arg(ap, u_int); 609 base = 16; 610 number: p = ksprintn(ul, base, &tmp); 611 if (width && (width -= tmp) > 0) 612 while (width--) 613 *bp++ = padc; 614 while ((ch = *p--) != 0) 615 *bp++ = ch; 616 break; 617 default: 618 *bp++ = '%'; 619 if (lflag) 620 *bp++ = 'l'; 621 /* FALLTHROUGH */ 622 case '%': 623 *bp++ = ch; 624 } 625 } 626 va_end(ap); 627 } 628 629 /* 630 * Put a number (base <= 16) in a buffer in reverse order; return an 631 * optional length and a pointer to the NULL terminated (preceded?) 632 * buffer. 633 */ 634 static char * 635 ksprintn(ul, base, lenp) 636 register u_long ul; 637 register int base, *lenp; 638 { /* A long in base 8, plus NULL. */ 639 static char buf[sizeof(long) * NBBY / 3 + 2]; 640 register char *p; 641 642 p = buf; 643 do { 644 *++p = "0123456789abcdef"[ul % base]; 645 } while (ul /= base); 646 if (lenp) 647 *lenp = p - buf; 648 return (p); 649 } 650
Indexes created Thu Sep 25 15:09:46 GMT 2025