armsrc/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  * 4. 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 <stddef.h>
  38 #include <stdarg.h>
  39 #include "printf.h"
  40 #include "util.h"
  41 #include "string.h"
  42
  43 typedef uint32_t uintmax_t;
  44 typedef int32_t intmax_t;
  45
  46 typedef unsigned char u_char;
  47 typedef unsigned int u_int;
  48 typedef unsigned long u_long;
  49 typedef unsigned short u_short;
  50 typedef unsigned long long u_quad_t;
  51 typedef long long quad_t;
  52
  53 typedef int ssize_t;
  54
  55 #define NBBY    8               /* number of bits in a byte */
  56
  57 char const hex2ascii_data[] = "0123456789abcdefghijklmnopqrstuvwxyz";
  58 #define hex2ascii(hex)  (hex2ascii_data[hex])
  59 #define toupper(c)      ((c) - 0x20 * (((c) >= 'a') && ((c) <= 'z')))
  60
  61 /* Max number conversion buffer length: a u_quad_t in base 2, plus NUL byte. */
  62 #define MAXNBUF (sizeof(intmax_t) * NBBY + 1)
  63
  64 /*
  65  * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
  66  * order; return an optional length and a pointer to the last character
  67  * written in the buffer (i.e., the first character of the string).
  68  * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
  69  */
  70 static char *
  71 ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
  72 {
  73         char *p, c;
  74
  75         p = nbuf;
  76         *p = '\0';
  77         do {
  78                 c = hex2ascii(num % base);
  79                 *++p = upper ? toupper(c) : c;
  80         } while (num /= base);
  81         if (lenp)
  82                 *lenp = p - nbuf;
  83         return (p);
  84 }
  85
  86 /*
  87  * Scaled down version of printf(3).
  88  *
  89  * Two additional formats:
  90  *
  91  * The format %b is supported to decode error registers.
  92  * Its usage is:
  93  *
  94  *      printf("reg=%b\n", regval, "*");
  95  *
  96  * where  is the output base expressed as a control character, e.g.
  97  * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
  98  * the first of which gives the bit number to be inspected (origin 1), and
  99  * the next characters (up to a control character, i.e. a character <= 32),
 100  * give the name of the register.  Thus:
 101  *
 102  *      kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
 103  *
 104  * would produce output:
 105  *
 106  *      reg=3
 107  *
 108  * XXX:  %D  -- Hexdump, takes pointer and separator string:
 109  *              ("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
 110  *              ("%*D", len, ptr, " " -> XX XX XX XX ...
 111  */
 112 int
 113 kvsprintf(char const *fmt, void *arg, int radix, va_list ap)
 114 {
 115 #define PCHAR(c) {int cc=(c); *d++ = cc; retval++; }
 116         char nbuf[MAXNBUF];
 117         char *d;
 118         const char *p, *percent, *q;
 119         u_char *up;
 120         int ch, n;
 121         uintmax_t num;
 122         int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
 123         int cflag, hflag, jflag, tflag, zflag;
 124         int dwidth, upper;
 125         char padc;
 126         int stop = 0, retval = 0;
 127
 128         num = 0;
 129         d = (char *) arg;
 130
 131         if (fmt == NULL)
 132                 fmt = "(fmt null)\n";
 133
 134         if (radix < 2 || radix > 36)
 135                 radix = 10;
 136
 137         for (;;) {
 138                 padc = ' ';
 139                 width = 0;
 140                 while ((ch = (u_char)*fmt++) != '%' || stop) {
 141                         PCHAR(ch);
 142                         if (ch == '\0')
 143                                 return (retval);
 144                 }
 145                 percent = fmt - 1;
 146                 qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
 147                 sign = 0; dot = 0; dwidth = 0; upper = 0;
 148                 cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
 149 reswitch:       switch (ch = (u_char)*fmt++) {
 150                 case '.':
 151                         dot = 1;
 152                         goto reswitch;
 153                 case '#':
 154                         sharpflag = 1;
 155                         goto reswitch;
 156                 case '+':
 157                         sign = 1;
 158                         goto reswitch;
 159                 case '-':
 160                         ladjust = 1;
 161                         goto reswitch;
 162                 case '%':
 163                         PCHAR(ch);
 164                         break;
 165                 case '*':
 166                         if (!dot) {
 167                                 width = va_arg(ap, int);
 168                                 if (width < 0) {
 169                                         ladjust = !ladjust;
 170                                         width = -width;
 171                                 }
 172                         } else {
 173                                 dwidth = va_arg(ap, int);
 174                         }
 175                         goto reswitch;
 176                 case '0':
 177                         if (!dot) {
 178                                 padc = '0';
 179                                 goto reswitch;
 180                         }
 181                 case '1': case '2': case '3': case '4':
 182                 case '5': case '6': case '7': case '8': case '9':
 183                                 for (n = 0;; ++fmt) {
 184                                         n = n * 10 + ch - '0';
 185                                         ch = *fmt;
 186                                         if (ch < '0' || ch > '9')
 187                                                 break;
 188                                 }
 189                         if (dot)
 190                                 dwidth = n;
 191                         else
 192                                 width = n;
 193                         goto reswitch;
 194                 case 'b':
 195                         num = (u_int)va_arg(ap, int);
 196                         p = va_arg(ap, char *);
 197                         for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
 198                                 PCHAR(*q--);
 199
 200                         if (num == 0)
 201                                 break;
 202
 203                         for (tmp = 0; *p;) {
 204                                 n = *p++;
 205                                 if (num & (1 << (n - 1))) {
 206                                         PCHAR(tmp ? ',' : '<');
 207                                         for (; (n = *p) > ' '; ++p)
 208                                                 PCHAR(n);
 209                                         tmp = 1;
 210                                 } else
 211                                         for (; *p > ' '; ++p)
 212                                                 continue;
 213                         }
 214                         if (tmp)
 215                                 PCHAR('>');
 216                         break;
 217                 case 'c':
 218                         PCHAR(va_arg(ap, int));
 219                         break;
 220                 case 'D':
 221                         up = va_arg(ap, u_char *);
 222                         p = va_arg(ap, char *);
 223                         if (!width)
 224                                 width = 16;
 225                         while(width--) {
 226                                 PCHAR(hex2ascii(*up >> 4));
 227                                 PCHAR(hex2ascii(*up & 0x0f));
 228                                 up++;
 229                                 if (width)
 230                                         for (q=p;*q;q++)
 231                                                 PCHAR(*q);
 232                         }
 233                         break;
 234                 case 'd':
 235                 case 'i':
 236                         base = 10;
 237                         sign = 1;
 238                         goto handle_sign;
 239                 case 'h':
 240                         if (hflag) {
 241                                 hflag = 0;
 242                                 cflag = 1;
 243                         } else
 244                                 hflag = 1;
 245                         goto reswitch;
 246                 case 'j':
 247                         jflag = 1;
 248                         goto reswitch;
 249                 case 'l':
 250                         if (lflag) {
 251                                 lflag = 0;
 252                                 qflag = 1;
 253                         } else
 254                                 lflag = 1;
 255                         goto reswitch;
 256                 case 'n':
 257                         if (jflag)
 258                                 *(va_arg(ap, intmax_t *)) = retval;
 259                         else if (qflag)
 260                                 *(va_arg(ap, quad_t *)) = retval;
 261                         else if (lflag)
 262                                 *(va_arg(ap, long *)) = retval;
 263                         else if (zflag)
 264                                 *(va_arg(ap, size_t *)) = retval;
 265                         else if (hflag)
 266                                 *(va_arg(ap, short *)) = retval;
 267                         else if (cflag)
 268                                 *(va_arg(ap, char *)) = retval;
 269                         else
 270                                 *(va_arg(ap, int *)) = retval;
 271                         break;
 272                 case 'o':
 273                         base = 8;
 274                         goto handle_nosign;
 275                 case 'p':
 276                         base = 16;
 277                         sharpflag = (width == 0);
 278                         sign = 0;
 279                         num = (uintptr_t)va_arg(ap, void *);
 280                         goto number;
 281                 case 'q':
 282                         qflag = 1;
 283                         goto reswitch;
 284                 case 'r':
 285                         base = radix;
 286                         if (sign)
 287                                 goto handle_sign;
 288                         goto handle_nosign;
 289                 case 's':
 290                         p = va_arg(ap, char *);
 291                         if (p == NULL)
 292                                 p = "(null)";
 293                         if (!dot)
 294                                 n = strlen (p);
 295                         else
 296                                 for (n = 0; n < dwidth && p[n]; n++)
 297                                         continue;
 298
 299                         width -= n;
 300
 301                         if (!ladjust && width > 0)
 302                                 while (width--)
 303                                         PCHAR(padc);
 304                         while (n--)
 305                                 PCHAR(*p++);
 306                         if (ladjust && width > 0)
 307                                 while (width--)
 308                                         PCHAR(padc);
 309                         break;
 310                 case 't':
 311                         tflag = 1;
 312                         goto reswitch;
 313                 case 'u':
 314                         base = 10;
 315                         goto handle_nosign;
 316                 case 'X':
 317                         upper = 1;
 318                 case 'x':
 319                         base = 16;
 320                         goto handle_nosign;
 321                 case 'y':
 322                         base = 16;
 323                         sign = 1;
 324                         goto handle_sign;
 325                 case 'z':
 326                         zflag = 1;
 327                         goto reswitch;
 328 handle_nosign:
 329                         sign = 0;
 330                         if (jflag)
 331                                 num = va_arg(ap, uintmax_t);
 332                         else if (qflag)
 333                                 num = va_arg(ap, u_quad_t);
 334                         else if (tflag)
 335                                 num = va_arg(ap, ptrdiff_t);
 336                         else if (lflag)
 337                                 num = va_arg(ap, u_long);
 338                         else if (zflag)
 339                                 num = va_arg(ap, size_t);
 340                         else if (hflag)
 341                                 num = (u_short)va_arg(ap, int);
 342                         else if (cflag)
 343                                 num = (u_char)va_arg(ap, int);
 344                         else
 345                                 num = va_arg(ap, u_int);
 346                         goto number;
 347 handle_sign:
 348                         if (jflag)
 349                                 num = va_arg(ap, intmax_t);
 350                         else if (qflag)
 351                                 num = va_arg(ap, quad_t);
 352                         else if (tflag)
 353                                 num = va_arg(ap, ptrdiff_t);
 354                         else if (lflag)
 355                                 num = va_arg(ap, long);
 356                         else if (zflag)
 357                                 num = va_arg(ap, ssize_t);
 358                         else if (hflag)
 359                                 num = (short)va_arg(ap, int);
 360                         else if (cflag)
 361                                 num = (char)va_arg(ap, int);
 362                         else
 363                                 num = va_arg(ap, int);
 364 number:
 365                         if (sign && (intmax_t)num < 0) {
 366                                 neg = 1;
 367                                 num = -(intmax_t)num;
 368                         }
 369                         p = ksprintn(nbuf, num, base, &tmp, upper);
 370                         if (sharpflag && num != 0) {
 371                                 if (base == 8)
 372                                         tmp++;
 373                                 else if (base == 16)
 374                                         tmp += 2;
 375                         }
 376                         if (neg)
 377                                 tmp++;
 378
 379                         if (!ladjust && padc != '0' && width
 380                             && (width -= tmp) > 0)
 381                                 while (width--)
 382                                         PCHAR(padc);
 383                         if (neg)
 384                                 PCHAR('-');
 385                         if (sharpflag && num != 0) {
 386                                 if (base == 8) {
 387                                         PCHAR('0');
 388                                 } else if (base == 16) {
 389                                         PCHAR('0');
 390                                         PCHAR('x');
 391                                 }
 392                         }
 393                         if (!ladjust && width && (width -= tmp) > 0)
 394                                 while (width--)
 395                                         PCHAR(padc);
 396
 397                         while (*p)
 398                                 PCHAR(*p--);
 399
 400                         if (ladjust && width && (width -= tmp) > 0)
 401                                 while (width--)
 402                                         PCHAR(padc);
 403
 404                         break;
 405                 default:
 406                         while (percent < fmt)
 407                                 PCHAR(*percent++);
 408                         /*
 409                          * Since we ignore an formatting argument it is no
 410                          * longer safe to obey the remaining formatting
 411                          * arguments as the arguments will no longer match
 412                          * the format specs.
 413                          */
 414                         stop = 1;
 415                         break;
 416                 }
 417         }
 418         PCHAR(0);
 419         return retval;
 420 #undef PCHAR
 421 }
 422
 423 int vsprintf(char *dest, const char *fmt, va_list ap)
 424 {
 425         return kvsprintf(fmt, dest, 10, ap);
 426 }
 427
 428 int
 429 sprintf(char *dest, const char *fmt, ...)
 430 {
 431         /* http://www.pagetable.com/?p=298 */
 432         int retval;
 433         va_list ap;
 434
 435         va_start(ap, fmt);
 436         retval = kvsprintf(fmt, dest, 10, ap);
 437         va_end(ap);
 438         return retval;
 439 }