libexec/rtld-elf/rtld_printf.c

   1 /*-
   2  * Copyright (c) 1986, 1988, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * $FreeBSD$
  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
  46 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
  47
  48 #define PRINT_METHOD_SNPRINTF   1
  49 #define PRINT_METHOD_WRITE      2
  50
  51 struct snprintf_arg {
  52         int     method;
  53         char    *str;
  54         char    *buf;
  55         size_t  remain;
  56         size_t  buf_total;
  57         int     fd;
  58 };
  59
  60 static void
  61 printf_out(struct snprintf_arg *info)
  62 {
  63
  64         if (info->remain == info->buf_total)
  65                 return;
  66         write(info->fd, info->buf, info->buf_total - info->remain);
  67         info->str = info->buf;
  68         info->remain = info->buf_total;
  69 }
  70
  71 static void
  72 snprintf_func(int ch, struct snprintf_arg *const info)
  73 {
  74
  75         switch (info->method) {
  76         case PRINT_METHOD_SNPRINTF:
  77                 if (info->remain >= 2) {
  78                         *info->str++ = ch;
  79                         info->remain--;
  80                 }
  81                 break;
  82         case PRINT_METHOD_WRITE:
  83                 if (info->remain > 0) {
  84                         *info->str++ = ch;
  85                         info->remain--;
  86                 } else
  87                         printf_out(info);
  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;
 129         uintmax_t num;
 130         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, 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; neg = 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 = 1;
 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                 case '1': case '2': case '3': case '4':
 189                 case '5': case '6': case '7': case '8': case '9':
 190                                 for (n = 0;; ++fmt) {
 191                                         n = n * 10 + ch - '0';
 192                                         ch = *fmt;
 193                                         if (ch < '0' || ch > '9')
 194                                                 break;
 195                                 }
 196                         if (dot)
 197                                 dwidth = n;
 198                         else
 199                                 width = n;
 200                         goto reswitch;
 201                 case 'b':
 202                         num = (u_int)va_arg(ap, int);
 203                         p = va_arg(ap, char *);
 204                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
 205                                 PCHAR(*q--);
 206
 207                         if (num == 0)
 208                                 break;
 209
 210                         for (tmp = 0; *p;) {
 211                                 n = *p++;
 212                                 if (num & (1 << (n - 1))) {
 213                                         PCHAR(tmp ? ',' : '<');
 214                                         for (; (n = *p) > ' '; ++p)
 215                                                 PCHAR(n);
 216                                         tmp = 1;
 217                                 } else
 218                                         for (; *p > ' '; ++p)
 219                                                 continue;
 220                         }
 221                         if (tmp)
 222                                 PCHAR('>');
 223                         break;
 224                 case 'c':
 225                         PCHAR(va_arg(ap, int));
 226                         break;
 227                 case 'D':
 228                         up = va_arg(ap, u_char *);
 229                         p = va_arg(ap, char *);
 230                         if (!width)
 231                                 width = 16;
 232                         while(width--) {
 233                                 PCHAR(hex2ascii(*up >> 4));
 234                                 PCHAR(hex2ascii(*up & 0x0f));
 235                                 up++;
 236                                 if (width)
 237                                         for (q=p;*q;q++)
 238                                                 PCHAR(*q);
 239                         }
 240                         break;
 241                 case 'd':
 242                 case 'i':
 243                         base = 10;
 244                         sign = 1;
 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                                 goto handle_sign;
 295                         goto handle_nosign;
 296                 case 's':
 297                         p = va_arg(ap, char *);
 298                         if (p == NULL)
 299                                 p = "(null)";
 300                         if (!dot)
 301                                 n = strlen (p);
 302                         else
 303                                 for (n = 0; n < dwidth && p[n]; n++)
 304                                         continue;
 305
 306                         width -= n;
 307
 308                         if (!ladjust && width > 0)
 309                                 while (width--)
 310                                         PCHAR(padc);
 311                         while (n--)
 312                                 PCHAR(*p++);
 313                         if (ladjust && width > 0)
 314                                 while (width--)
 315                                         PCHAR(padc);
 316                         break;
 317                 case 't':
 318                         tflag = 1;
 319                         goto reswitch;
 320                 case 'u':
 321                         base = 10;
 322                         goto handle_nosign;
 323                 case 'X':
 324                         upper = 1;
 325                 case 'x':
 326                         base = 16;
 327                         goto handle_nosign;
 328                 case 'y':
 329                         base = 16;
 330                         sign = 1;
 331                         goto handle_sign;
 332                 case 'z':
 333                         zflag = 1;
 334                         goto reswitch;
 335 handle_nosign:
 336                         sign = 0;
 337                         if (jflag)
 338                                 num = va_arg(ap, uintmax_t);
 339                         else if (qflag)
 340                                 num = va_arg(ap, u_quad_t);
 341                         else if (tflag)
 342                                 num = va_arg(ap, ptrdiff_t);
 343                         else if (lflag)
 344                                 num = va_arg(ap, u_long);
 345                         else if (zflag)
 346                                 num = va_arg(ap, size_t);
 347                         else if (hflag)
 348                                 num = (u_short)va_arg(ap, int);
 349                         else if (cflag)
 350                                 num = (u_char)va_arg(ap, int);
 351                         else
 352                                 num = va_arg(ap, u_int);
 353                         goto number;
 354 handle_sign:
 355                         if (jflag)
 356                                 num = va_arg(ap, intmax_t);
 357                         else if (qflag)
 358                                 num = va_arg(ap, quad_t);
 359                         else if (tflag)
 360                                 num = va_arg(ap, ptrdiff_t);
 361                         else if (lflag)
 362                                 num = va_arg(ap, long);
 363                         else if (zflag)
 364                                 num = va_arg(ap, ssize_t);
 365                         else if (hflag)
 366                                 num = (short)va_arg(ap, int);
 367                         else if (cflag)
 368                                 num = (char)va_arg(ap, int);
 369                         else
 370                                 num = va_arg(ap, int);
 371 number:
 372                         if (sign && (intmax_t)num < 0) {
 373                                 neg = 1;
 374                                 num = -(intmax_t)num;
 375                         }
 376                         p = ksprintn(nbuf, num, base, &n, upper);
 377                         tmp = 0;
 378                         if (sharpflag && num != 0) {
 379                                 if (base == 8)
 380                                         tmp++;
 381                                 else if (base == 16)
 382                                         tmp += 2;
 383                         }
 384                         if (neg)
 385                                 tmp++;
 386
 387                         if (!ladjust && padc == '0')
 388                                 dwidth = width - tmp;
 389                         width -= tmp + imax(dwidth, n);
 390                         dwidth -= n;
 391                         if (!ladjust)
 392                                 while (width-- > 0)
 393                                         PCHAR(' ');
 394                         if (neg)
 395                                 PCHAR('-');
 396                         if (sharpflag && num != 0) {
 397                                 if (base == 8) {
 398                                         PCHAR('0');
 399                                 } else if (base == 16) {
 400                                         PCHAR('0');
 401                                         PCHAR('x');
 402                                 }
 403                         }
 404                         while (dwidth-- > 0)
 405                                 PCHAR('0');
 406
 407                         while (*p)
 408                                 PCHAR(*p--);
 409
 410                         if (ladjust)
 411                                 while (width-- > 0)
 412                                         PCHAR(' ');
 413
 414                         break;
 415                 default:
 416                         while (percent < fmt)
 417                                 PCHAR(*percent++);
 418                         /*
 419                          * Since we ignore an formatting argument it is no
 420                          * longer safe to obey the remaining formatting
 421                          * arguments as the arguments will no longer match
 422                          * the format specs.
 423                          */
 424                         stop = 1;
 425                         break;
 426                 }
 427         }
 428 #undef PCHAR
 429 }
 430
 431 int
 432 rtld_vsnprintf(char *buf, size_t bufsize, const char *fmt, va_list ap)
 433 {
 434         struct snprintf_arg info;
 435         int retval;
 436
 437         info.method = PRINT_METHOD_SNPRINTF;
 438         info.buf = info.str = buf;
 439         info.buf_total = info.remain = bufsize;
 440         info.fd = -1;
 441         retval = kvprintf(fmt, &info, 10, ap);
 442         if (info.remain >= 1)
 443                 *info.str++ = '\0';
 444         return (retval);
 445 }
 446
 447 int
 448 rtld_vfdprintf(int fd, const char *fmt, va_list ap)
 449 {
 450         char buf[512];
 451         struct snprintf_arg info;
 452         int retval;
 453
 454         info.method = PRINT_METHOD_WRITE;
 455         info.buf = info.str = buf;
 456         info.buf_total = info.remain = sizeof(buf);
 457         info.fd = fd;
 458         retval = kvprintf(fmt, &info, 10, ap);
 459         printf_out(&info);
 460         return (retval);
 461 }
 462
 463 int
 464 rtld_fdprintf(int fd, const char *fmt, ...)
 465 {
 466         va_list ap;
 467         int retval;
 468
 469         va_start(ap, fmt);
 470         retval = rtld_vfdprintf(fd, fmt, ap);
 471         va_end(ap);
 472         return (retval);
 473 }
 474
 475 void
 476 rtld_fdputstr(int fd, const char *str)
 477 {
 478
 479         write(fd, str, strlen(str));
 480 }
 481
 482 void
 483 rtld_fdputchar(int fd, int c)
 484 {
 485         char c1;
 486
 487         c1 = c;
 488         write(fd, &c1, 1);
 489 }