| 1 | |
| 2 | #include <limits.h> |
| 3 | #include <stdarg.h> |
| 4 | |
| 5 | #include "putty.h" |
| 6 | |
| 7 | #define __P(decl) decl |
| 8 | |
| 9 | /* XXX */ |
| 10 | typedef unsigned long u_quad_t; |
| 11 | typedef long quad_t; |
| 12 | |
| 13 | typedef unsigned long u_long; |
| 14 | typedef unsigned int u_int; |
| 15 | typedef unsigned short u_short; |
| 16 | typedef long intmax_t; |
| 17 | typedef unsigned long uintmax_t; |
| 18 | typedef long intptr_t; |
| 19 | typedef unsigned long uintptr_t; |
| 20 | typedef int ssize_t; |
| 21 | |
| 22 | #define NBBY CHAR_BIT |
| 23 | |
| 24 | /*- |
| 25 | * Copyright (c) 1986, 1988, 1991, 1993 |
| 26 | * The Regents of the University of California. All rights reserved. |
| 27 | * (c) UNIX System Laboratories, Inc. |
| 28 | * All or some portions of this file are derived from material licensed |
| 29 | * to the University of California by American Telephone and Telegraph |
| 30 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 31 | * the permission of UNIX System Laboratories, Inc. |
| 32 | * |
| 33 | * Redistribution and use in source and binary forms, with or without |
| 34 | * modification, are permitted provided that the following conditions |
| 35 | * are met: |
| 36 | * 1. Redistributions of source code must retain the above copyright |
| 37 | * notice, this list of conditions and the following disclaimer. |
| 38 | * 2. Redistributions in binary form must reproduce the above copyright |
| 39 | * notice, this list of conditions and the following disclaimer in the |
| 40 | * documentation and/or other materials provided with the distribution. |
| 41 | * 3. Neither the name of the University nor the names of its contributors |
| 42 | * may be used to endorse or promote products derived from this software |
| 43 | * without specific prior written permission. |
| 44 | * |
| 45 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 55 | * SUCH DAMAGE. |
| 56 | * |
| 57 | * From NetBSD: subr_prf.c,v 1.86 2002/11/02 07:25:22 perry Exp |
| 58 | * @(#)subr_prf.c 8.4 (Berkeley) 5/4/95 |
| 59 | */ |
| 60 | |
| 61 | /* flags for kprintf */ |
| 62 | #define TOCONS 0x01 /* to the console */ |
| 63 | #define TOTTY 0x02 /* to the process' tty */ |
| 64 | #define TOLOG 0x04 /* to the kernel message buffer */ |
| 65 | #define TOBUFONLY 0x08 /* to the buffer (only) [for snprintf] */ |
| 66 | #define TODDB 0x10 /* to ddb console */ |
| 67 | |
| 68 | /* max size buffer kprintf needs to print quad_t [size in base 8 + \0] */ |
| 69 | #define KPRINTF_BUFSIZE (sizeof(quad_t) * NBBY / 3 + 2) |
| 70 | |
| 71 | |
| 72 | /* |
| 73 | * local prototypes |
| 74 | */ |
| 75 | |
| 76 | static int kprintf __P((const char *, int, void *, |
| 77 | char *, va_list)); |
| 78 | |
| 79 | /* |
| 80 | * vsnprintf: print a message to a buffer [already have va_alist] |
| 81 | */ |
| 82 | int |
| 83 | vsnprintf(buf, size, fmt, ap) |
| 84 | char *buf; |
| 85 | size_t size; |
| 86 | const char *fmt; |
| 87 | va_list ap; |
| 88 | { |
| 89 | int retval; |
| 90 | char *p; |
| 91 | |
| 92 | if (size < 1) |
| 93 | return (-1); |
| 94 | p = buf + size - 1; |
| 95 | retval = kprintf(fmt, TOBUFONLY, &p, buf, ap); |
| 96 | *(p) = 0; /* null terminate */ |
| 97 | return(retval); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | /* |
| 102 | * kprintf: scaled down version of printf(3). |
| 103 | * |
| 104 | * this version based on vfprintf() from libc which was derived from |
| 105 | * software contributed to Berkeley by Chris Torek. |
| 106 | * |
| 107 | * NOTE: The kprintf mutex must be held if we're going TOBUF or TOCONS! |
| 108 | */ |
| 109 | |
| 110 | /* |
| 111 | * macros for converting digits to letters and vice versa |
| 112 | */ |
| 113 | #define to_digit(c) ((c) - '0') |
| 114 | #define is_digit(c) ((unsigned)to_digit(c) <= 9) |
| 115 | #define to_char(n) ((n) + '0') |
| 116 | |
| 117 | /* |
| 118 | * flags used during conversion. |
| 119 | */ |
| 120 | #define ALT 0x001 /* alternate form */ |
| 121 | #define HEXPREFIX 0x002 /* add 0x or 0X prefix */ |
| 122 | #define LADJUST 0x004 /* left adjustment */ |
| 123 | #define LONGDBL 0x008 /* long double; unimplemented */ |
| 124 | #define LONGINT 0x010 /* long integer */ |
| 125 | #define QUADINT 0x020 /* quad integer */ |
| 126 | #define SHORTINT 0x040 /* short integer */ |
| 127 | #define MAXINT 0x080 /* intmax_t */ |
| 128 | #define PTRINT 0x100 /* intptr_t */ |
| 129 | #define SIZEINT 0x200 /* size_t */ |
| 130 | #define ZEROPAD 0x400 /* zero (as opposed to blank) pad */ |
| 131 | #define FPT 0x800 /* Floating point number */ |
| 132 | |
| 133 | /* |
| 134 | * To extend shorts properly, we need both signed and unsigned |
| 135 | * argument extraction methods. |
| 136 | */ |
| 137 | #define SARG() \ |
| 138 | (flags&MAXINT ? va_arg(ap, intmax_t) : \ |
| 139 | flags&PTRINT ? va_arg(ap, intptr_t) : \ |
| 140 | flags&SIZEINT ? va_arg(ap, ssize_t) : /* XXX */ \ |
| 141 | flags&QUADINT ? va_arg(ap, quad_t) : \ |
| 142 | flags&LONGINT ? va_arg(ap, long) : \ |
| 143 | flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ |
| 144 | (long)va_arg(ap, int)) |
| 145 | #define UARG() \ |
| 146 | (flags&MAXINT ? va_arg(ap, uintmax_t) : \ |
| 147 | flags&PTRINT ? va_arg(ap, uintptr_t) : \ |
| 148 | flags&SIZEINT ? va_arg(ap, size_t) : \ |
| 149 | flags&QUADINT ? va_arg(ap, u_quad_t) : \ |
| 150 | flags&LONGINT ? va_arg(ap, u_long) : \ |
| 151 | flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ |
| 152 | (u_long)va_arg(ap, u_int)) |
| 153 | |
| 154 | #define KPRINTF_PUTCHAR(C) { \ |
| 155 | if (oflags == TOBUFONLY) { \ |
| 156 | if ((vp != NULL) && (sbuf == tailp)) { \ |
| 157 | ret += 1; /* indicate error */ \ |
| 158 | goto overflow; \ |
| 159 | } \ |
| 160 | *sbuf++ = (C); \ |
| 161 | } \ |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Guts of kernel printf. Note, we already expect to be in a mutex! |
| 166 | */ |
| 167 | static int |
| 168 | kprintf(fmt0, oflags, vp, sbuf, ap) |
| 169 | const char *fmt0; |
| 170 | int oflags; |
| 171 | void *vp; |
| 172 | char *sbuf; |
| 173 | va_list ap; |
| 174 | { |
| 175 | char *fmt; /* format string */ |
| 176 | int ch; /* character from fmt */ |
| 177 | int n; /* handy integer (short term usage) */ |
| 178 | char *cp; /* handy char pointer (short term usage) */ |
| 179 | int flags; /* flags as above */ |
| 180 | int ret; /* return value accumulator */ |
| 181 | int width; /* width from format (%8d), or 0 */ |
| 182 | int prec; /* precision from format (%.3d), or -1 */ |
| 183 | char sign; /* sign prefix (' ', '+', '-', or \0) */ |
| 184 | |
| 185 | u_quad_t _uquad; /* integer arguments %[diouxX] */ |
| 186 | enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ |
| 187 | int dprec; /* a copy of prec if [diouxX], 0 otherwise */ |
| 188 | int realsz; /* field size expanded by dprec */ |
| 189 | int size; /* size of converted field or string */ |
| 190 | char *xdigs; /* digits for [xX] conversion */ |
| 191 | char buf[KPRINTF_BUFSIZE]; /* space for %c, %[diouxX] */ |
| 192 | char *tailp; /* tail pointer for snprintf */ |
| 193 | |
| 194 | tailp = NULL; /* XXX: shutup gcc */ |
| 195 | if (oflags == TOBUFONLY && (vp != NULL)) |
| 196 | tailp = *(char **)vp; |
| 197 | |
| 198 | cp = NULL; /* XXX: shutup gcc */ |
| 199 | size = 0; /* XXX: shutup gcc */ |
| 200 | |
| 201 | fmt = (char *)fmt0; |
| 202 | ret = 0; |
| 203 | |
| 204 | xdigs = NULL; /* XXX: shut up gcc warning */ |
| 205 | |
| 206 | /* |
| 207 | * Scan the format for conversions (`%' character). |
| 208 | */ |
| 209 | for (;;) { |
| 210 | while (*fmt != '%' && *fmt) { |
| 211 | ret++; |
| 212 | KPRINTF_PUTCHAR(*fmt++); |
| 213 | } |
| 214 | if (*fmt == 0) |
| 215 | goto done; |
| 216 | |
| 217 | fmt++; /* skip over '%' */ |
| 218 | |
| 219 | flags = 0; |
| 220 | dprec = 0; |
| 221 | width = 0; |
| 222 | prec = -1; |
| 223 | sign = '\0'; |
| 224 | |
| 225 | rflag: ch = *fmt++; |
| 226 | reswitch: switch (ch) { |
| 227 | case ' ': |
| 228 | /* |
| 229 | * ``If the space and + flags both appear, the space |
| 230 | * flag will be ignored.'' |
| 231 | * -- ANSI X3J11 |
| 232 | */ |
| 233 | if (!sign) |
| 234 | sign = ' '; |
| 235 | goto rflag; |
| 236 | case '#': |
| 237 | flags |= ALT; |
| 238 | goto rflag; |
| 239 | case '*': |
| 240 | /* |
| 241 | * ``A negative field width argument is taken as a |
| 242 | * - flag followed by a positive field width.'' |
| 243 | * -- ANSI X3J11 |
| 244 | * They don't exclude field widths read from args. |
| 245 | */ |
| 246 | if ((width = va_arg(ap, int)) >= 0) |
| 247 | goto rflag; |
| 248 | width = -width; |
| 249 | /* FALLTHROUGH */ |
| 250 | case '-': |
| 251 | flags |= LADJUST; |
| 252 | goto rflag; |
| 253 | case '+': |
| 254 | sign = '+'; |
| 255 | goto rflag; |
| 256 | case '.': |
| 257 | if ((ch = *fmt++) == '*') { |
| 258 | n = va_arg(ap, int); |
| 259 | prec = n < 0 ? -1 : n; |
| 260 | goto rflag; |
| 261 | } |
| 262 | n = 0; |
| 263 | while (is_digit(ch)) { |
| 264 | n = 10 * n + to_digit(ch); |
| 265 | ch = *fmt++; |
| 266 | } |
| 267 | prec = n < 0 ? -1 : n; |
| 268 | goto reswitch; |
| 269 | case '0': |
| 270 | /* |
| 271 | * ``Note that 0 is taken as a flag, not as the |
| 272 | * beginning of a field width.'' |
| 273 | * -- ANSI X3J11 |
| 274 | */ |
| 275 | flags |= ZEROPAD; |
| 276 | goto rflag; |
| 277 | case '1': case '2': case '3': case '4': |
| 278 | case '5': case '6': case '7': case '8': case '9': |
| 279 | n = 0; |
| 280 | do { |
| 281 | n = 10 * n + to_digit(ch); |
| 282 | ch = *fmt++; |
| 283 | } while (is_digit(ch)); |
| 284 | width = n; |
| 285 | goto reswitch; |
| 286 | case 'h': |
| 287 | flags |= SHORTINT; |
| 288 | goto rflag; |
| 289 | case 'j': |
| 290 | flags |= MAXINT; |
| 291 | goto rflag; |
| 292 | case 'l': |
| 293 | if (*fmt == 'l') { |
| 294 | fmt++; |
| 295 | flags |= QUADINT; |
| 296 | } else { |
| 297 | flags |= LONGINT; |
| 298 | } |
| 299 | goto rflag; |
| 300 | case 'q': |
| 301 | flags |= QUADINT; |
| 302 | goto rflag; |
| 303 | case 't': |
| 304 | flags |= PTRINT; |
| 305 | goto rflag; |
| 306 | case 'z': |
| 307 | flags |= SIZEINT; |
| 308 | goto rflag; |
| 309 | case 'c': |
| 310 | *(cp = buf) = va_arg(ap, int); |
| 311 | size = 1; |
| 312 | sign = '\0'; |
| 313 | break; |
| 314 | case 'D': |
| 315 | flags |= LONGINT; |
| 316 | /*FALLTHROUGH*/ |
| 317 | case 'd': |
| 318 | case 'i': |
| 319 | _uquad = SARG(); |
| 320 | if ((quad_t)_uquad < 0) { |
| 321 | _uquad = -_uquad; |
| 322 | sign = '-'; |
| 323 | } |
| 324 | base = DEC; |
| 325 | goto number; |
| 326 | case 'n': |
| 327 | if (flags & MAXINT) |
| 328 | *va_arg(ap, intmax_t *) = ret; |
| 329 | else if (flags & PTRINT) |
| 330 | *va_arg(ap, intptr_t *) = ret; |
| 331 | else if (flags & SIZEINT) |
| 332 | *va_arg(ap, ssize_t *) = ret; |
| 333 | else if (flags & QUADINT) |
| 334 | *va_arg(ap, quad_t *) = ret; |
| 335 | else if (flags & LONGINT) |
| 336 | *va_arg(ap, long *) = ret; |
| 337 | else if (flags & SHORTINT) |
| 338 | *va_arg(ap, short *) = ret; |
| 339 | else |
| 340 | *va_arg(ap, int *) = ret; |
| 341 | continue; /* no output */ |
| 342 | case 'O': |
| 343 | flags |= LONGINT; |
| 344 | /*FALLTHROUGH*/ |
| 345 | case 'o': |
| 346 | _uquad = UARG(); |
| 347 | base = OCT; |
| 348 | goto nosign; |
| 349 | case 'p': |
| 350 | /* |
| 351 | * ``The argument shall be a pointer to void. The |
| 352 | * value of the pointer is converted to a sequence |
| 353 | * of printable characters, in an implementation- |
| 354 | * defined manner.'' |
| 355 | * -- ANSI X3J11 |
| 356 | */ |
| 357 | /* NOSTRICT */ |
| 358 | _uquad = (u_long)va_arg(ap, void *); |
| 359 | base = HEX; |
| 360 | xdigs = "0123456789abcdef"; |
| 361 | flags |= HEXPREFIX; |
| 362 | ch = 'x'; |
| 363 | goto nosign; |
| 364 | case 's': |
| 365 | if ((cp = va_arg(ap, char *)) == NULL) |
| 366 | cp = "(null)"; |
| 367 | if (prec >= 0) { |
| 368 | /* |
| 369 | * can't use strlen; can only look for the |
| 370 | * NUL in the first `prec' characters, and |
| 371 | * strlen() will go further. |
| 372 | */ |
| 373 | char *p = memchr(cp, 0, prec); |
| 374 | |
| 375 | if (p != NULL) { |
| 376 | size = p - cp; |
| 377 | if (size > prec) |
| 378 | size = prec; |
| 379 | } else |
| 380 | size = prec; |
| 381 | } else |
| 382 | size = strlen(cp); |
| 383 | sign = '\0'; |
| 384 | break; |
| 385 | case 'U': |
| 386 | flags |= LONGINT; |
| 387 | /*FALLTHROUGH*/ |
| 388 | case 'u': |
| 389 | _uquad = UARG(); |
| 390 | base = DEC; |
| 391 | goto nosign; |
| 392 | case 'X': |
| 393 | xdigs = "0123456789ABCDEF"; |
| 394 | goto hex; |
| 395 | case 'x': |
| 396 | xdigs = "0123456789abcdef"; |
| 397 | hex: _uquad = UARG(); |
| 398 | base = HEX; |
| 399 | /* leading 0x/X only if non-zero */ |
| 400 | if (flags & ALT && _uquad != 0) |
| 401 | flags |= HEXPREFIX; |
| 402 | |
| 403 | /* unsigned conversions */ |
| 404 | nosign: sign = '\0'; |
| 405 | /* |
| 406 | * ``... diouXx conversions ... if a precision is |
| 407 | * specified, the 0 flag will be ignored.'' |
| 408 | * -- ANSI X3J11 |
| 409 | */ |
| 410 | number: if ((dprec = prec) >= 0) |
| 411 | flags &= ~ZEROPAD; |
| 412 | |
| 413 | /* |
| 414 | * ``The result of converting a zero value with an |
| 415 | * explicit precision of zero is no characters.'' |
| 416 | * -- ANSI X3J11 |
| 417 | */ |
| 418 | cp = buf + KPRINTF_BUFSIZE; |
| 419 | if (_uquad != 0 || prec != 0) { |
| 420 | /* |
| 421 | * Unsigned mod is hard, and unsigned mod |
| 422 | * by a constant is easier than that by |
| 423 | * a variable; hence this switch. |
| 424 | */ |
| 425 | switch (base) { |
| 426 | case OCT: |
| 427 | do { |
| 428 | *--cp = to_char(_uquad & 7); |
| 429 | _uquad >>= 3; |
| 430 | } while (_uquad); |
| 431 | /* handle octal leading 0 */ |
| 432 | if (flags & ALT && *cp != '0') |
| 433 | *--cp = '0'; |
| 434 | break; |
| 435 | |
| 436 | case DEC: |
| 437 | /* many numbers are 1 digit */ |
| 438 | while (_uquad >= 10) { |
| 439 | *--cp = to_char(_uquad % 10); |
| 440 | _uquad /= 10; |
| 441 | } |
| 442 | *--cp = to_char(_uquad); |
| 443 | break; |
| 444 | |
| 445 | case HEX: |
| 446 | do { |
| 447 | *--cp = xdigs[_uquad & 15]; |
| 448 | _uquad >>= 4; |
| 449 | } while (_uquad); |
| 450 | break; |
| 451 | |
| 452 | default: |
| 453 | cp = "bug in kprintf: bad base"; |
| 454 | size = strlen(cp); |
| 455 | goto skipsize; |
| 456 | } |
| 457 | } |
| 458 | size = buf + KPRINTF_BUFSIZE - cp; |
| 459 | skipsize: |
| 460 | break; |
| 461 | default: /* "%?" prints ?, unless ? is NUL */ |
| 462 | if (ch == '\0') |
| 463 | goto done; |
| 464 | /* pretend it was %c with argument ch */ |
| 465 | cp = buf; |
| 466 | *cp = ch; |
| 467 | size = 1; |
| 468 | sign = '\0'; |
| 469 | break; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * All reasonable formats wind up here. At this point, `cp' |
| 474 | * points to a string which (if not flags&LADJUST) should be |
| 475 | * padded out to `width' places. If flags&ZEROPAD, it should |
| 476 | * first be prefixed by any sign or other prefix; otherwise, |
| 477 | * it should be blank padded before the prefix is emitted. |
| 478 | * After any left-hand padding and prefixing, emit zeroes |
| 479 | * required by a decimal [diouxX] precision, then print the |
| 480 | * string proper, then emit zeroes required by any leftover |
| 481 | * floating precision; finally, if LADJUST, pad with blanks. |
| 482 | * |
| 483 | * Compute actual size, so we know how much to pad. |
| 484 | * size excludes decimal prec; realsz includes it. |
| 485 | */ |
| 486 | realsz = dprec > size ? dprec : size; |
| 487 | if (sign) |
| 488 | realsz++; |
| 489 | else if (flags & HEXPREFIX) |
| 490 | realsz+= 2; |
| 491 | |
| 492 | /* adjust ret */ |
| 493 | ret += width > realsz ? width : realsz; |
| 494 | |
| 495 | /* right-adjusting blank padding */ |
| 496 | if ((flags & (LADJUST|ZEROPAD)) == 0) { |
| 497 | n = width - realsz; |
| 498 | while (n-- > 0) |
| 499 | KPRINTF_PUTCHAR(' '); |
| 500 | } |
| 501 | |
| 502 | /* prefix */ |
| 503 | if (sign) { |
| 504 | KPRINTF_PUTCHAR(sign); |
| 505 | } else if (flags & HEXPREFIX) { |
| 506 | KPRINTF_PUTCHAR('0'); |
| 507 | KPRINTF_PUTCHAR(ch); |
| 508 | } |
| 509 | |
| 510 | /* right-adjusting zero padding */ |
| 511 | if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) { |
| 512 | n = width - realsz; |
| 513 | while (n-- > 0) |
| 514 | KPRINTF_PUTCHAR('0'); |
| 515 | } |
| 516 | |
| 517 | /* leading zeroes from decimal precision */ |
| 518 | n = dprec - size; |
| 519 | while (n-- > 0) |
| 520 | KPRINTF_PUTCHAR('0'); |
| 521 | |
| 522 | /* the string or number proper */ |
| 523 | while (size--) |
| 524 | KPRINTF_PUTCHAR(*cp++); |
| 525 | /* left-adjusting padding (always blank) */ |
| 526 | if (flags & LADJUST) { |
| 527 | n = width - realsz; |
| 528 | while (n-- > 0) |
| 529 | KPRINTF_PUTCHAR(' '); |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | done: |
| 534 | if ((oflags == TOBUFONLY) && (vp != NULL)) |
| 535 | *(char **)vp = sbuf; |
| 536 | overflow: |
| 537 | return (ret); |
| 538 | /* NOTREACHED */ |
| 539 | } |