1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org> 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <sys/param.h> 39 #include <inttypes.h> 40 #include <stdarg.h> 41 #include <stddef.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include "rtld_printf.h" 45 #include "rtld_libc.h" 46 47 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 48 49 #define PRINT_METHOD_SNPRINTF 1 50 #define PRINT_METHOD_WRITE 2 51 52 struct snprintf_arg { 53 int method; 54 char *str; 55 char *buf; 56 size_t remain; 57 size_t buf_total; 58 int fd; 59 }; 60 61 static void 62 printf_out(struct snprintf_arg *info) 63 { 64 65 if (info->remain == info->buf_total) 66 return; 67 write(info->fd, info->buf, info->buf_total - info->remain); 68 info->str = info->buf; 69 info->remain = info->buf_total; 70 } 71 72 static void 73 snprintf_func(int ch, struct snprintf_arg *const info) 74 { 75 76 switch (info->method) { 77 case PRINT_METHOD_SNPRINTF: 78 if (info->remain >= 2) { 79 *info->str++ = ch; 80 info->remain--; 81 } 82 break; 83 case PRINT_METHOD_WRITE: 84 if (info->remain == 0) 85 printf_out(info); 86 *info->str++ = ch; 87 info->remain--; 88 break; 89 } 90 } 91 92 static char const hex2ascii_lower[] = "0123456789abcdefghijklmnopqrstuvwxyz"; 93 static char const hex2ascii_upper[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 94 #define hex2ascii(hex) (hex2ascii_lower[hex]) 95 #define hex2ascii_upper(hex) (hex2ascii_upper[hex]) 96 97 static __inline int 98 imax(int a, int b) 99 { 100 101 return (a > b ? a : b); 102 } 103 104 static char * 105 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 106 { 107 char *p, c; 108 109 p = nbuf; 110 *p = '\0'; 111 do { 112 c = upper ? hex2ascii_upper(num % base) : 113 hex2ascii(num % base); 114 *++p = c; 115 } while (num /= base); 116 if (lenp) 117 *lenp = p - nbuf; 118 return (p); 119 } 120 121 static int 122 kvprintf(char const *fmt, struct snprintf_arg *arg, int radix, va_list ap) 123 { 124 #define PCHAR(c) snprintf_func((c), arg) 125 char nbuf[MAXNBUF]; 126 const char *p, *percent, *q; 127 u_char *up; 128 int ch, n, sign; 129 uintmax_t num; 130 int base, lflag, qflag, tmp, width, ladjust, sharpflag, dot; 131 int cflag, hflag, jflag, tflag, zflag; 132 int dwidth, upper; 133 char padc; 134 int stop = 0, retval = 0; 135 136 num = 0; 137 138 if (fmt == NULL) 139 fmt = "(fmt null)\n"; 140 141 if (radix < 2 || radix > 36) 142 radix = 10; 143 144 for (;;) { 145 padc = ' '; 146 width = 0; 147 while ((ch = (u_char)*fmt++) != '%' || stop) { 148 if (ch == '\0') 149 return (retval); 150 PCHAR(ch); 151 } 152 percent = fmt - 1; 153 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; 154 sign = 0; dot = 0; dwidth = 0; upper = 0; 155 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 156 reswitch: switch (ch = (u_char)*fmt++) { 157 case '.': 158 dot = 1; 159 goto reswitch; 160 case '#': 161 sharpflag = 1; 162 goto reswitch; 163 case '+': 164 sign = '+'; 165 goto reswitch; 166 case '-': 167 ladjust = 1; 168 goto reswitch; 169 case '%': 170 PCHAR(ch); 171 break; 172 case '*': 173 if (!dot) { 174 width = va_arg(ap, int); 175 if (width < 0) { 176 ladjust = !ladjust; 177 width = -width; 178 } 179 } else { 180 dwidth = va_arg(ap, int); 181 } 182 goto reswitch; 183 case '0': 184 if (!dot) { 185 padc = '0'; 186 goto reswitch; 187 } 188 /* FALLTHROUGH */ 189 case '1': case '2': case '3': case '4': 190 case '5': case '6': case '7': case '8': case '9': 191 for (n = 0;; ++fmt) { 192 n = n * 10 + ch - '0'; 193 ch = *fmt; 194 if (ch < '0' || ch > '9') 195 break; 196 } 197 if (dot) 198 dwidth = n; 199 else 200 width = n; 201 goto reswitch; 202 case 'b': 203 num = (u_int)va_arg(ap, int); 204 p = va_arg(ap, char *); 205 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 206 PCHAR(*q--); 207 208 if (num == 0) 209 break; 210 211 for (tmp = 0; *p;) { 212 n = *p++; 213 if (num & (1 << (n - 1))) { 214 PCHAR(tmp ? ',' : '<'); 215 for (; (n = *p) > ' '; ++p) 216 PCHAR(n); 217 tmp = 1; 218 } else 219 for (; *p > ' '; ++p) 220 continue; 221 } 222 if (tmp) 223 PCHAR('>'); 224 break; 225 case 'c': 226 PCHAR(va_arg(ap, int)); 227 break; 228 case 'D': 229 up = va_arg(ap, u_char *); 230 p = va_arg(ap, char *); 231 if (!width) 232 width = 16; 233 while(width--) { 234 PCHAR(hex2ascii(*up >> 4)); 235 PCHAR(hex2ascii(*up & 0x0f)); 236 up++; 237 if (width) 238 for (q=p;*q;q++) 239 PCHAR(*q); 240 } 241 break; 242 case 'd': 243 case 'i': 244 base = 10; 245 goto handle_sign; 246 case 'h': 247 if (hflag) { 248 hflag = 0; 249 cflag = 1; 250 } else 251 hflag = 1; 252 goto reswitch; 253 case 'j': 254 jflag = 1; 255 goto reswitch; 256 case 'l': 257 if (lflag) { 258 lflag = 0; 259 qflag = 1; 260 } else 261 lflag = 1; 262 goto reswitch; 263 case 'n': 264 if (jflag) 265 *(va_arg(ap, intmax_t *)) = retval; 266 else if (qflag) 267 *(va_arg(ap, quad_t *)) = retval; 268 else if (lflag) 269 *(va_arg(ap, long *)) = retval; 270 else if (zflag) 271 *(va_arg(ap, size_t *)) = retval; 272 else if (hflag) 273 *(va_arg(ap, short *)) = retval; 274 else if (cflag) 275 *(va_arg(ap, char *)) = retval; 276 else 277 *(va_arg(ap, int *)) = retval; 278 break; 279 case 'o': 280 base = 8; 281 goto handle_nosign; 282 case 'p': 283 base = 16; 284 sharpflag = (width == 0); 285 sign = 0; 286 num = (uintptr_t)va_arg(ap, void *); 287 goto number; 288 case 'q': 289 qflag = 1; 290 goto reswitch; 291 case 'r': 292 base = radix; 293 if (sign) { 294 sign = 0; 295 goto handle_sign; 296 } 297 goto handle_nosign; 298 case 's': 299 p = va_arg(ap, char *); 300 if (p == NULL) 301 p = "(null)"; 302 if (!dot) 303 n = strlen (p); 304 else 305 for (n = 0; n < dwidth && p[n]; n++) 306 continue; 307 308 width -= n; 309 310 if (!ladjust && width > 0) 311 while (width--) 312 PCHAR(padc); 313 while (n--) 314 PCHAR(*p++); 315 if (ladjust && width > 0) 316 while (width--) 317 PCHAR(padc); 318 break; 319 case 't': 320 tflag = 1; 321 goto reswitch; 322 case 'u': 323 base = 10; 324 goto handle_nosign; 325 case 'X': 326 upper = 1; 327 /* FALLTHROUGH */ 328 case 'x': 329 base = 16; 330 goto handle_nosign; 331 case 'y': 332 base = 16; 333 goto handle_sign; 334 case 'z': 335 zflag = 1; 336 goto reswitch; 337 handle_nosign: 338 if (jflag) 339 num = va_arg(ap, uintmax_t); 340 else if (qflag) 341 num = va_arg(ap, u_quad_t); 342 else if (tflag) 343 num = va_arg(ap, ptrdiff_t); 344 else if (lflag) 345 num = va_arg(ap, u_long); 346 else if (zflag) 347 num = va_arg(ap, size_t); 348 else if (hflag) 349 num = (u_short)va_arg(ap, int); 350 else if (cflag) 351 num = (u_char)va_arg(ap, int); 352 else 353 num = va_arg(ap, u_int); 354 goto number; 355 handle_sign: 356 if (jflag) 357 num = va_arg(ap, intmax_t); 358 else if (qflag) 359 num = va_arg(ap, quad_t); 360 else if (tflag) 361 num = va_arg(ap, ptrdiff_t); 362 else if (lflag) 363 num = va_arg(ap, long); 364 else if (zflag) 365 num = va_arg(ap, ssize_t); 366 else if (hflag) 367 num = (short)va_arg(ap, int); 368 else if (cflag) 369 num = (signed char)va_arg(ap, int); 370 else 371 num = va_arg(ap, int); 372 if ((intmax_t)num < 0) { 373 sign = '-'; 374 num = -(intmax_t)num; 375 } 376 number: 377 p = ksprintn(nbuf, num, base, &n, upper); 378 tmp = 0; 379 if (sharpflag && num != 0) { 380 if (base == 8) 381 tmp++; 382 else if (base == 16) 383 tmp += 2; 384 } 385 if (sign) 386 tmp++; 387 388 if (!ladjust && padc == '0') 389 dwidth = width - tmp; 390 width -= tmp + imax(dwidth, n); 391 dwidth -= n; 392 if (!ladjust) 393 while (width-- > 0) 394 PCHAR(' '); 395 if (sign) 396 PCHAR(sign); 397 if (sharpflag && num != 0) { 398 if (base == 8) { 399 PCHAR('0'); 400 } else if (base == 16) { 401 PCHAR('0'); 402 PCHAR('x'); 403 } 404 } 405 while (dwidth-- > 0) 406 PCHAR('0'); 407 408 while (*p) 409 PCHAR(*p--); 410 411 if (ladjust) 412 while (width-- > 0) 413 PCHAR(' '); 414 415 break; 416 default: 417 while (percent < fmt) 418 PCHAR(*percent++); 419 /* 420 * Since we ignore an formatting argument it is no 421 * longer safe to obey the remaining formatting 422 * arguments as the arguments will no longer match 423 * the format specs. 424 */ 425 stop = 1; 426 break; 427 } 428 } 429 #undef PCHAR 430 } 431 432 int 433 rtld_snprintf(char *buf, size_t bufsize, const char *fmt, ...) 434 { 435 va_list ap; 436 int retval; 437 438 va_start(ap, fmt); 439 retval = rtld_vsnprintf(buf, bufsize, fmt, ap); 440 va_end(ap); 441 return (retval); 442 } 443 444 int 445 rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap) 446 { 447 struct snprintf_arg info; 448 int retval; 449 450 info.method = PRINT_METHOD_SNPRINTF; 451 info.buf = info.str = buf; 452 info.buf_total = info.remain = bufsize; 453 info.fd = -1; 454 retval = kvprintf(fmt, &info, 10, ap); 455 if (info.remain >= 1) 456 *info.str++ = '\0'; 457 return (retval); 458 } 459 460 int 461 rtld_vfdprintf(int fd, const char *fmt, va_list ap) 462 { 463 char buf[512]; 464 struct snprintf_arg info; 465 int retval; 466 467 info.method = PRINT_METHOD_WRITE; 468 info.buf = info.str = buf; 469 info.buf_total = info.remain = sizeof(buf); 470 info.fd = fd; 471 retval = kvprintf(fmt, &info, 10, ap); 472 printf_out(&info); 473 return (retval); 474 } 475 476 int 477 rtld_fdprintf(int fd, const char *fmt, ...) 478 { 479 va_list ap; 480 int retval; 481 482 va_start(ap, fmt); 483 retval = rtld_vfdprintf(fd, fmt, ap); 484 va_end(ap); 485 return (retval); 486 } 487 488 int 489 rtld_fdprintfx(int fd, const char *fmt, ...) 490 { 491 va_list ap; 492 int retval; 493 494 va_start(ap, fmt); 495 retval = rtld_vfdprintf(fd, fmt, ap); 496 va_end(ap); 497 return (retval); 498 } 499 500 void 501 rtld_fdputstr(int fd, const char *str) 502 { 503 504 write(fd, str, strlen(str)); 505 } 506 507 void 508 rtld_fdputchar(int fd, int c) 509 { 510 char c1; 511 512 c1 = c; 513 write(fd, &c1, 1); 514 } 515