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 * $FreeBSD$ 38 */ 39 40 #include <sys/param.h> 41 #include <inttypes.h> 42 #include <stdarg.h> 43 #include <stddef.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include "rtld_printf.h" 47 48 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1) 49 50 #define PRINT_METHOD_SNPRINTF 1 51 #define PRINT_METHOD_WRITE 2 52 53 struct snprintf_arg { 54 int method; 55 char *str; 56 char *buf; 57 size_t remain; 58 size_t buf_total; 59 int fd; 60 }; 61 62 static void 63 printf_out(struct snprintf_arg *info) 64 { 65 66 if (info->remain == info->buf_total) 67 return; 68 write(info->fd, info->buf, info->buf_total - info->remain); 69 info->str = info->buf; 70 info->remain = info->buf_total; 71 } 72 73 static void 74 snprintf_func(int ch, struct snprintf_arg *const info) 75 { 76 77 switch (info->method) { 78 case PRINT_METHOD_SNPRINTF: 79 if (info->remain >= 2) { 80 *info->str++ = ch; 81 info->remain--; 82 } 83 break; 84 case PRINT_METHOD_WRITE: 85 if (info->remain > 0) { 86 *info->str++ = ch; 87 info->remain--; 88 } else 89 printf_out(info); 90 break; 91 } 92 } 93 94 static char const hex2ascii_lower[] = "0123456789abcdefghijklmnopqrstuvwxyz"; 95 static char const hex2ascii_upper[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 96 #define hex2ascii(hex) (hex2ascii_lower[hex]) 97 #define hex2ascii_upper(hex) (hex2ascii_upper[hex]) 98 99 static __inline int 100 imax(int a, int b) 101 { 102 103 return (a > b ? a : b); 104 } 105 106 static char * 107 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper) 108 { 109 char *p, c; 110 111 p = nbuf; 112 *p = '\0'; 113 do { 114 c = upper ? hex2ascii_upper(num % base) : 115 hex2ascii(num % base); 116 *++p = c; 117 } while (num /= base); 118 if (lenp) 119 *lenp = p - nbuf; 120 return (p); 121 } 122 123 static int 124 kvprintf(char const *fmt, struct snprintf_arg *arg, int radix, va_list ap) 125 { 126 #define PCHAR(c) snprintf_func((c), arg) 127 char nbuf[MAXNBUF]; 128 const char *p, *percent, *q; 129 u_char *up; 130 int ch, n; 131 uintmax_t num; 132 int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot; 133 int cflag, hflag, jflag, tflag, zflag; 134 int dwidth, upper; 135 char padc; 136 int stop = 0, retval = 0; 137 138 num = 0; 139 140 if (fmt == NULL) 141 fmt = "(fmt null)\n"; 142 143 if (radix < 2 || radix > 36) 144 radix = 10; 145 146 for (;;) { 147 padc = ' '; 148 width = 0; 149 while ((ch = (u_char)*fmt++) != '%' || stop) { 150 if (ch == '\0') 151 return (retval); 152 PCHAR(ch); 153 } 154 percent = fmt - 1; 155 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0; 156 sign = 0; dot = 0; dwidth = 0; upper = 0; 157 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0; 158 reswitch: switch (ch = (u_char)*fmt++) { 159 case '.': 160 dot = 1; 161 goto reswitch; 162 case '#': 163 sharpflag = 1; 164 goto reswitch; 165 case '+': 166 sign = 1; 167 goto reswitch; 168 case '-': 169 ladjust = 1; 170 goto reswitch; 171 case '%': 172 PCHAR(ch); 173 break; 174 case '*': 175 if (!dot) { 176 width = va_arg(ap, int); 177 if (width < 0) { 178 ladjust = !ladjust; 179 width = -width; 180 } 181 } else { 182 dwidth = va_arg(ap, int); 183 } 184 goto reswitch; 185 case '0': 186 if (!dot) { 187 padc = '0'; 188 goto reswitch; 189 } 190 case '1': case '2': case '3': case '4': 191 case '5': case '6': case '7': case '8': case '9': 192 for (n = 0;; ++fmt) { 193 n = n * 10 + ch - '0'; 194 ch = *fmt; 195 if (ch < '0' || ch > '9') 196 break; 197 } 198 if (dot) 199 dwidth = n; 200 else 201 width = n; 202 goto reswitch; 203 case 'b': 204 num = (u_int)va_arg(ap, int); 205 p = va_arg(ap, char *); 206 for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;) 207 PCHAR(*q--); 208 209 if (num == 0) 210 break; 211 212 for (tmp = 0; *p;) { 213 n = *p++; 214 if (num & (1 << (n - 1))) { 215 PCHAR(tmp ? ',' : '<'); 216 for (; (n = *p) > ' '; ++p) 217 PCHAR(n); 218 tmp = 1; 219 } else 220 for (; *p > ' '; ++p) 221 continue; 222 } 223 if (tmp) 224 PCHAR('>'); 225 break; 226 case 'c': 227 PCHAR(va_arg(ap, int)); 228 break; 229 case 'D': 230 up = va_arg(ap, u_char *); 231 p = va_arg(ap, char *); 232 if (!width) 233 width = 16; 234 while(width--) { 235 PCHAR(hex2ascii(*up >> 4)); 236 PCHAR(hex2ascii(*up & 0x0f)); 237 up++; 238 if (width) 239 for (q=p;*q;q++) 240 PCHAR(*q); 241 } 242 break; 243 case 'd': 244 case 'i': 245 base = 10; 246 sign = 1; 247 goto handle_sign; 248 case 'h': 249 if (hflag) { 250 hflag = 0; 251 cflag = 1; 252 } else 253 hflag = 1; 254 goto reswitch; 255 case 'j': 256 jflag = 1; 257 goto reswitch; 258 case 'l': 259 if (lflag) { 260 lflag = 0; 261 qflag = 1; 262 } else 263 lflag = 1; 264 goto reswitch; 265 case 'n': 266 if (jflag) 267 *(va_arg(ap, intmax_t *)) = retval; 268 else if (qflag) 269 *(va_arg(ap, quad_t *)) = retval; 270 else if (lflag) 271 *(va_arg(ap, long *)) = retval; 272 else if (zflag) 273 *(va_arg(ap, size_t *)) = retval; 274 else if (hflag) 275 *(va_arg(ap, short *)) = retval; 276 else if (cflag) 277 *(va_arg(ap, char *)) = retval; 278 else 279 *(va_arg(ap, int *)) = retval; 280 break; 281 case 'o': 282 base = 8; 283 goto handle_nosign; 284 case 'p': 285 base = 16; 286 sharpflag = (width == 0); 287 sign = 0; 288 num = (uintptr_t)va_arg(ap, void *); 289 goto number; 290 case 'q': 291 qflag = 1; 292 goto reswitch; 293 case 'r': 294 base = radix; 295 if (sign) 296 goto handle_sign; 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 case 'x': 328 base = 16; 329 goto handle_nosign; 330 case 'y': 331 base = 16; 332 sign = 1; 333 goto handle_sign; 334 case 'z': 335 zflag = 1; 336 goto reswitch; 337 handle_nosign: 338 sign = 0; 339 if (jflag) 340 num = va_arg(ap, uintmax_t); 341 else if (qflag) 342 num = va_arg(ap, u_quad_t); 343 else if (tflag) 344 num = va_arg(ap, ptrdiff_t); 345 else if (lflag) 346 num = va_arg(ap, u_long); 347 else if (zflag) 348 num = va_arg(ap, size_t); 349 else if (hflag) 350 num = (u_short)va_arg(ap, int); 351 else if (cflag) 352 num = (u_char)va_arg(ap, int); 353 else 354 num = va_arg(ap, u_int); 355 goto number; 356 handle_sign: 357 if (jflag) 358 num = va_arg(ap, intmax_t); 359 else if (qflag) 360 num = va_arg(ap, quad_t); 361 else if (tflag) 362 num = va_arg(ap, ptrdiff_t); 363 else if (lflag) 364 num = va_arg(ap, long); 365 else if (zflag) 366 num = va_arg(ap, ssize_t); 367 else if (hflag) 368 num = (short)va_arg(ap, int); 369 else if (cflag) 370 num = (char)va_arg(ap, int); 371 else 372 num = va_arg(ap, int); 373 number: 374 if (sign && (intmax_t)num < 0) { 375 neg = 1; 376 num = -(intmax_t)num; 377 } 378 p = ksprintn(nbuf, num, base, &n, upper); 379 tmp = 0; 380 if (sharpflag && num != 0) { 381 if (base == 8) 382 tmp++; 383 else if (base == 16) 384 tmp += 2; 385 } 386 if (neg) 387 tmp++; 388 389 if (!ladjust && padc == '0') 390 dwidth = width - tmp; 391 width -= tmp + imax(dwidth, n); 392 dwidth -= n; 393 if (!ladjust) 394 while (width-- > 0) 395 PCHAR(' '); 396 if (neg) 397 PCHAR('-'); 398 if (sharpflag && num != 0) { 399 if (base == 8) { 400 PCHAR('0'); 401 } else if (base == 16) { 402 PCHAR('0'); 403 PCHAR('x'); 404 } 405 } 406 while (dwidth-- > 0) 407 PCHAR('0'); 408 409 while (*p) 410 PCHAR(*p--); 411 412 if (ladjust) 413 while (width-- > 0) 414 PCHAR(' '); 415 416 break; 417 default: 418 while (percent < fmt) 419 PCHAR(*percent++); 420 /* 421 * Since we ignore an formatting argument it is no 422 * longer safe to obey the remaining formatting 423 * arguments as the arguments will no longer match 424 * the format specs. 425 */ 426 stop = 1; 427 break; 428 } 429 } 430 #undef PCHAR 431 } 432 433 int 434 rtld_snprintf(char *buf, size_t bufsize, const char *fmt, ...) 435 { 436 va_list ap; 437 int retval; 438 439 va_start(ap, fmt); 440 retval = rtld_vsnprintf(buf, bufsize, fmt, ap); 441 va_end(ap); 442 return (retval); 443 } 444 445 int 446 rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap) 447 { 448 struct snprintf_arg info; 449 int retval; 450 451 info.method = PRINT_METHOD_SNPRINTF; 452 info.buf = info.str = buf; 453 info.buf_total = info.remain = bufsize; 454 info.fd = -1; 455 retval = kvprintf(fmt, &info, 10, ap); 456 if (info.remain >= 1) 457 *info.str++ = '\0'; 458 return (retval); 459 } 460 461 int 462 rtld_vfdprintf(int fd, const char *fmt, va_list ap) 463 { 464 char buf[512]; 465 struct snprintf_arg info; 466 int retval; 467 468 info.method = PRINT_METHOD_WRITE; 469 info.buf = info.str = buf; 470 info.buf_total = info.remain = sizeof(buf); 471 info.fd = fd; 472 retval = kvprintf(fmt, &info, 10, ap); 473 printf_out(&info); 474 return (retval); 475 } 476 477 int 478 rtld_fdprintf(int fd, const char *fmt, ...) 479 { 480 va_list ap; 481 int retval; 482 483 va_start(ap, fmt); 484 retval = rtld_vfdprintf(fd, fmt, ap); 485 va_end(ap); 486 return (retval); 487 } 488 489 void 490 rtld_fdputstr(int fd, const char *str) 491 { 492 493 write(fd, str, strlen(str)); 494 } 495 496 void 497 rtld_fdputchar(int fd, int c) 498 { 499 char c1; 500 501 c1 = c; 502 write(fd, &c1, 1); 503 } 504