stand/libsa/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  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)subr_prf.c  8.3 (Berkeley) 1/21/94
  35  */
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 /*
  41  * Standaloneified version of the FreeBSD kernel printf family.
  42  */
  43
  44 #include <sys/types.h>
  45 #include <sys/stddef.h>
  46 #include <sys/stdint.h>
  47 #include <limits.h>
  48 #include <string.h>
  49 #include "stand.h"
  50
  51 /*
  52  * Note that stdarg.h and the ANSI style va_start macro is used for both
  53  * ANSI and traditional C compilers.
  54  */
  55 #include <machine/stdarg.h>
  56
  57 #define MAXNBUF (sizeof(intmax_t) * CHAR_BIT + 1)
  58
  59 typedef void (kvprintf_fn_t)(int, void *);
  60
  61 static char     *ksprintn (char *buf, uintmax_t num, int base, int *len, int upper);
  62 static int      kvprintf(char const *fmt, kvprintf_fn_t *func, void *arg, int radix, va_list ap);
  63
  64 static void
  65 putchar_wrapper(int cc, void *arg)
  66 {
  67
  68         putchar(cc);
  69 }
  70
  71 int
  72 printf(const char *fmt, ...)
  73 {
  74         va_list ap;
  75         int retval;
  76
  77         va_start(ap, fmt);
  78         retval = kvprintf(fmt, putchar_wrapper, NULL, 10, ap);
  79         va_end(ap);
  80         return retval;
  81 }
  82
  83 int
  84 vprintf(const char *fmt, va_list ap)
  85 {
  86
  87         return (kvprintf(fmt, putchar_wrapper, NULL, 10, ap));
  88 }
  89
  90 int
  91 sprintf(char *buf, const char *cfmt, ...)
  92 {
  93         int retval;
  94         va_list ap;
  95
  96         va_start(ap, cfmt);
  97         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
  98         buf[retval] = '\0';
  99         va_end(ap);
 100         return retval;
 101 }
 102
 103 struct print_buf {
 104         char *buf;
 105         size_t size;
 106 };
 107
 108 static void
 109 snprint_func(int ch, void *arg)
 110 {
 111         struct print_buf *pbuf = arg;
 112
 113         if (pbuf->size < 2) {
 114                 /*
 115                  * Reserve last buffer position for the terminating
 116                  * character:
 117                  */
 118                 return;
 119         }
 120         *(pbuf->buf)++ = ch;
 121         pbuf->size--;
 122 }
 123
 124 int
 125 asprintf(char **buf, const char *cfmt, ...)
 126 {
 127         int retval;
 128         struct print_buf arg;
 129         va_list ap;
 130
 131         *buf = NULL;
 132         va_start(ap, cfmt);
 133         retval = kvprintf(cfmt, NULL, NULL, 10, ap);
 134         va_end(ap);
 135         if (retval <= 0)
 136                 return (-1);
 137
 138         arg.size = retval + 1;
 139         arg.buf = *buf = malloc(arg.size);
 140         if (*buf == NULL)
 141                 return (-1);
 142
 143         va_start(ap, cfmt);
 144         retval = kvprintf(cfmt, &snprint_func, &arg, 10, ap);
 145         va_end(ap);
 146
 147         if (arg.size >= 1)
 148                 *(arg.buf)++ = 0;
 149         return (retval);
 150 }
 151
 152 int
 153 snprintf(char *buf, size_t size, const char *cfmt, ...)
 154 {
 155         int retval;
 156         va_list ap;
 157         struct print_buf arg;
 158
 159         arg.buf = buf;
 160         arg.size = size;
 161
 162         va_start(ap, cfmt);
 163         retval = kvprintf(cfmt, &snprint_func, &arg, 10, ap);
 164         va_end(ap);
 165
 166         if (arg.size >= 1)
 167                 *(arg.buf)++ = 0;
 168         return retval;
 169 }
 170
 171 int
 172 vsnprintf(char *buf, size_t size, const char *cfmt, va_list ap)
 173 {
 174         struct print_buf arg;
 175         int retval;
 176
 177         arg.buf = buf;
 178         arg.size = size;
 179
 180         retval = kvprintf(cfmt, &snprint_func, &arg, 10, ap);
 181
 182         if (arg.size >= 1)
 183                 *(arg.buf)++ = 0;
 184
 185         return (retval);
 186 }
 187
 188 int
 189 vsprintf(char *buf, const char *cfmt, va_list ap)
 190 {
 191         int     retval;
 192
 193         retval = kvprintf(cfmt, NULL, (void *)buf, 10, ap);
 194         buf[retval] = '\0';
 195
 196         return (retval);
 197 }
 198
 199 /*
 200  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
 201  * order; return an optional length and a pointer to the last character
 202  * written in the buffer (i.e., the first character of the string).
 203  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
 204  */
 205 static char *
 206 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
 207 {
 208         char *p, c;
 209
 210         p = nbuf;
 211         *p = '\0';
 212         do {
 213                 c = hex2ascii(num % base);
 214                 *++p = upper ? toupper(c) : c;
 215         } while (num /= base);
 216         if (lenp)
 217                 *lenp = p - nbuf;
 218         return (p);
 219 }
 220
 221 /*
 222  * Scaled down version of printf(3).
 223  *
 224  * Two additional formats:
 225  *
 226  * The format %b is supported to decode error registers.
 227  * Its usage is:
 228  *
 229  *      printf("reg=%b\n", regval, "<base><arg>*");
 230  *
 231  * where <base> is the output base expressed as a control character, e.g.
 232  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
 233  * the first of which gives the bit number to be inspected (origin 1), and
 234  * the next characters (up to a control character, i.e. a character <= 32),
 235  * give the name of the register.  Thus:
 236  *
 237  *      kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE");
 238  *
 239  * would produce output:
 240  *
 241  *      reg=3<BITTWO,BITONE>
 242  *
 243  * XXX:  %D  -- Hexdump, takes pointer and separator string:
 244  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
 245  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
 246  */
 247 static int
 248 kvprintf(char const *fmt, kvprintf_fn_t *func, void *arg, int radix, va_list ap)
 249 {
 250 #define PCHAR(c) { \
 251         int cc = (c);                           \
 252                                                 \
 253         if (func) {                             \
 254                 (*func)(cc, arg);               \
 255         } else if (d != NULL) {                 \
 256                 *d++ = cc;                      \
 257         }                                       \
 258         retval++;                               \
 259         }
 260
 261         char nbuf[MAXNBUF];
 262         char *d;
 263         const char *p, *percent, *q;
 264         uint16_t *S;
 265         u_char *up;
 266         int ch, n;
 267         uintmax_t num;
 268         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
 269         int cflag, hflag, jflag, tflag, zflag;
 270         int dwidth, upper;
 271         char padc;
 272         int stop = 0, retval = 0;
 273
 274         num = 0;
 275         if (!func)
 276                 d = (char *) arg;
 277         else
 278                 d = NULL;
 279
 280         if (fmt == NULL)
 281                 fmt = "(fmt null)\n";
 282
 283         if (radix < 2 || radix > 36)
 284                 radix = 10;
 285
 286         for (;;) {
 287                 padc = ' ';
 288                 width = 0;
 289                 while ((ch = (u_char)*fmt++) != '%' || stop) {
 290                         if (ch == '\0')
 291                                 return (retval);
 292                         PCHAR(ch);
 293                 }
 294                 percent = fmt - 1;
 295                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
 296                 sign = 0; dot = 0; dwidth = 0; upper = 0;
 297                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
 298 reswitch:       switch (ch = (u_char)*fmt++) {
 299                 case '.':
 300                         dot = 1;
 301                         goto reswitch;
 302                 case '#':
 303                         sharpflag = 1;
 304                         goto reswitch;
 305                 case '+':
 306                         sign = 1;
 307                         goto reswitch;
 308                 case '-':
 309                         ladjust = 1;
 310                         goto reswitch;
 311                 case '%':
 312                         PCHAR(ch);
 313                         break;
 314                 case '*':
 315                         if (!dot) {
 316                                 width = va_arg(ap, int);
 317                                 if (width < 0) {
 318                                         ladjust = !ladjust;
 319                                         width = -width;
 320                                 }
 321                         } else {
 322                                 dwidth = va_arg(ap, int);
 323                         }
 324                         goto reswitch;
 325                 case '0':
 326                         if (!dot) {
 327                                 padc = '0';
 328                                 goto reswitch;
 329                         }
 330                 case '1': case '2': case '3': case '4':
 331                 case '5': case '6': case '7': case '8': case '9':
 332                                 for (n = 0;; ++fmt) {
 333                                         n = n * 10 + ch - '0';
 334                                         ch = *fmt;
 335                                         if (ch < '0' || ch > '9')
 336                                                 break;
 337                                 }
 338                         if (dot)
 339                                 dwidth = n;
 340                         else
 341                                 width = n;
 342                         goto reswitch;
 343                 case 'b':
 344                         num = (u_int)va_arg(ap, int);
 345                         p = va_arg(ap, char *);
 346                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
 347                                 PCHAR(*q--);
 348
 349                         if (num == 0)
 350                                 break;
 351
 352                         for (tmp = 0; *p;) {
 353                                 n = *p++;
 354                                 if (num & (1 << (n - 1))) {
 355                                         PCHAR(tmp ? ',' : '<');
 356                                         for (; (n = *p) > ' '; ++p)
 357                                                 PCHAR(n);
 358                                         tmp = 1;
 359                                 } else
 360                                         for (; *p > ' '; ++p)
 361                                                 continue;
 362                         }
 363                         if (tmp)
 364                                 PCHAR('>');
 365                         break;
 366                 case 'c':
 367                         PCHAR(va_arg(ap, int));
 368                         break;
 369                 case 'D':
 370                         up = va_arg(ap, u_char *);
 371                         p = va_arg(ap, char *);
 372                         if (!width)
 373                                 width = 16;
 374                         while(width--) {
 375                                 PCHAR(hex2ascii(*up >> 4));
 376                                 PCHAR(hex2ascii(*up & 0x0f));
 377                                 up++;
 378                                 if (width)
 379                                         for (q=p;*q;q++)
 380                                                 PCHAR(*q);
 381                         }
 382                         break;
 383                 case 'd':
 384                 case 'i':
 385                         base = 10;
 386                         sign = 1;
 387                         goto handle_sign;
 388                 case 'h':
 389                         if (hflag) {
 390                                 hflag = 0;
 391                                 cflag = 1;
 392                         } else
 393                                 hflag = 1;
 394                         goto reswitch;
 395                 case 'j':
 396                         jflag = 1;
 397                         goto reswitch;
 398                 case 'l':
 399                         if (lflag) {
 400                                 lflag = 0;
 401                                 qflag = 1;
 402                         } else
 403                                 lflag = 1;
 404                         goto reswitch;
 405                 case 'n':
 406                         if (jflag)
 407                                 *(va_arg(ap, intmax_t *)) = retval;
 408                         else if (qflag)
 409                                 *(va_arg(ap, quad_t *)) = retval;
 410                         else if (lflag)
 411                                 *(va_arg(ap, long *)) = retval;
 412                         else if (zflag)
 413                                 *(va_arg(ap, size_t *)) = retval;
 414                         else if (hflag)
 415                                 *(va_arg(ap, short *)) = retval;
 416                         else if (cflag)
 417                                 *(va_arg(ap, char *)) = retval;
 418                         else
 419                                 *(va_arg(ap, int *)) = retval;
 420                         break;
 421                 case 'o':
 422                         base = 8;
 423                         goto handle_nosign;
 424                 case 'p':
 425                         base = 16;
 426                         sharpflag = (width == 0);
 427                         sign = 0;
 428                         num = (uintptr_t)va_arg(ap, void *);
 429                         goto number;
 430                 case 'q':
 431                         qflag = 1;
 432                         goto reswitch;
 433                 case 'r':
 434                         base = radix;
 435                         if (sign)
 436                                 goto handle_sign;
 437                         goto handle_nosign;
 438                 case 's':
 439                         p = va_arg(ap, char *);
 440                         if (p == NULL)
 441                                 p = "(null)";
 442                         if (!dot)
 443                                 n = strlen (p);
 444                         else
 445                                 for (n = 0; n < dwidth && p[n]; n++)
 446                                         continue;
 447
 448                         width -= n;
 449
 450                         if (!ladjust && width > 0)
 451                                 while (width--)
 452                                         PCHAR(padc);
 453                         while (n--)
 454                                 PCHAR(*p++);
 455                         if (ladjust && width > 0)
 456                                 while (width--)
 457                                         PCHAR(padc);
 458                         break;
 459                 case 'S':       /* Assume console can cope with wide chars */
 460                         for (S = va_arg(ap, uint16_t *); *S != 0; S++)
 461                                 PCHAR(*S);
 462                         break;
 463                 case 't':
 464                         tflag = 1;
 465                         goto reswitch;
 466                 case 'u':
 467                         base = 10;
 468                         goto handle_nosign;
 469                 case 'X':
 470                         upper = 1;
 471                 case 'x':
 472                         base = 16;
 473                         goto handle_nosign;
 474                 case 'y':
 475                         base = 16;
 476                         sign = 1;
 477                         goto handle_sign;
 478                 case 'z':
 479                         zflag = 1;
 480                         goto reswitch;
 481 handle_nosign:
 482                         sign = 0;
 483                         if (jflag)
 484                                 num = va_arg(ap, uintmax_t);
 485                         else if (qflag)
 486                                 num = va_arg(ap, u_quad_t);
 487                         else if (tflag)
 488                                 num = va_arg(ap, ptrdiff_t);
 489                         else if (lflag)
 490                                 num = va_arg(ap, u_long);
 491                         else if (zflag)
 492                                 num = va_arg(ap, size_t);
 493                         else if (hflag)
 494                                 num = (u_short)va_arg(ap, int);
 495                         else if (cflag)
 496                                 num = (u_char)va_arg(ap, int);
 497                         else
 498                                 num = va_arg(ap, u_int);
 499                         goto number;
 500 handle_sign:
 501                         if (jflag)
 502                                 num = va_arg(ap, intmax_t);
 503                         else if (qflag)
 504                                 num = va_arg(ap, quad_t);
 505                         else if (tflag)
 506                                 num = va_arg(ap, ptrdiff_t);
 507                         else if (lflag)
 508                                 num = va_arg(ap, long);
 509                         else if (zflag)
 510                                 num = va_arg(ap, ssize_t);
 511                         else if (hflag)
 512                                 num = (short)va_arg(ap, int);
 513                         else if (cflag)
 514                                 num = (char)va_arg(ap, int);
 515                         else
 516                                 num = va_arg(ap, int);
 517 number:
 518                         if (sign && (intmax_t)num < 0) {
 519                                 neg = 1;
 520                                 num = -(intmax_t)num;
 521                         }
 522                         p = ksprintn(nbuf, num, base, &n, upper);
 523                         tmp = 0;
 524                         if (sharpflag && num != 0) {
 525                                 if (base == 8)
 526                                         tmp++;
 527                                 else if (base == 16)
 528                                         tmp += 2;
 529                         }
 530                         if (neg)
 531                                 tmp++;
 532
 533                         if (!ladjust && padc == '0')
 534                                 dwidth = width - tmp;
 535                         width -= tmp + imax(dwidth, n);
 536                         dwidth -= n;
 537                         if (!ladjust)
 538                                 while (width-- > 0)
 539                                         PCHAR(' ');
 540                         if (neg)
 541                                 PCHAR('-');
 542                         if (sharpflag && num != 0) {
 543                                 if (base == 8) {
 544                                         PCHAR('0');
 545                                 } else if (base == 16) {
 546                                         PCHAR('0');
 547                                         PCHAR('x');
 548                                 }
 549                         }
 550                         while (dwidth-- > 0)
 551                                 PCHAR('0');
 552
 553                         while (*p)
 554                                 PCHAR(*p--);
 555
 556                         if (ladjust)
 557                                 while (width-- > 0)
 558                                         PCHAR(' ');
 559
 560                         break;
 561                 default:
 562                         while (percent < fmt)
 563                                 PCHAR(*percent++);
 564                         /*
 565                          * Since we ignore a formatting argument it is no
 566                          * longer safe to obey the remaining formatting
 567                          * arguments as the arguments will no longer match
 568                          * the format specs.
 569                          */
 570                         stop = 1;
 571                         break;
 572                 }
 573         }
 574 #undef PCHAR
 575 }