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