lib/vsprintf.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
   8 /*
   9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  10  *
  11  * from hush: simple_itoa() was lifted from boa-0.93.15
  12  */
  13
  14 #include <stdarg.h>
  15 #include <linux/types.h>
  16 #include <linux/string.h>
  17 #include <linux/ctype.h>
  18 #include <errno.h>
  19
  20 #include <common.h>
  21 #if !defined(CONFIG_PANIC_HANG)
  22 #include <command.h>
  23 #endif
  24
  25 #include <div64.h>
  26 #define noinline __attribute__((noinline))
  27
  28 /* some reluctance to put this into a new limits.h, so it is here */
  29 #define INT_MAX         ((int)(~0U>>1))
  30
  31 unsigned long simple_strtoul(const char *cp, char **endp,
  32                                 unsigned int base)
  33 {
  34         unsigned long result = 0;
  35         unsigned long value;
  36
  37         if (*cp == '0') {
  38                 cp++;
  39                 if ((*cp == 'x') && isxdigit(cp[1])) {
  40                         base = 16;
  41                         cp++;
  42                 }
  43
  44                 if (!base)
  45                         base = 8;
  46         }
  47
  48         if (!base)
  49                 base = 10;
  50
  51         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  52             ? toupper(*cp) : *cp)-'A'+10) < base) {
  53                 result = result*base + value;
  54                 cp++;
  55         }
  56
  57         if (endp)
  58                 *endp = (char *)cp;
  59
  60         return result;
  61 }
  62
  63 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
  64 {
  65         char *tail;
  66         unsigned long val;
  67         size_t len;
  68
  69         *res = 0;
  70         len = strlen(cp);
  71         if (len == 0)
  72                 return -EINVAL;
  73
  74         val = simple_strtoul(cp, &tail, base);
  75         if (tail == cp)
  76                 return -EINVAL;
  77
  78         if ((*tail == '\0') ||
  79                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
  80                 *res = val;
  81                 return 0;
  82         }
  83
  84         return -EINVAL;
  85 }
  86
  87 long simple_strtol(const char *cp, char **endp, unsigned int base)
  88 {
  89         if (*cp == '-')
  90                 return -simple_strtoul(cp + 1, endp, base);
  91
  92         return simple_strtoul(cp, endp, base);
  93 }
  94
  95 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
  96 {
  97         unsigned long result = simple_strtoul(cp, endp, base);
  98         switch (**endp) {
  99         case 'G':
 100                 result *= 1024;
 101                 /* fall through */
 102         case 'M':
 103                 result *= 1024;
 104                 /* fall through */
 105         case 'K':
 106         case 'k':
 107                 result *= 1024;
 108                 if ((*endp)[1] == 'i') {
 109                         if ((*endp)[2] == 'B')
 110                                 (*endp) += 3;
 111                         else
 112                                 (*endp) += 2;
 113                 }
 114         }
 115         return result;
 116 }
 117
 118 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
 119 {
 120         unsigned long long result = simple_strtoull(cp, endp, base);
 121         switch (**endp) {
 122         case 'G':
 123                 result *= 1024;
 124                 /* fall through */
 125         case 'M':
 126                 result *= 1024;
 127                 /* fall through */
 128         case 'K':
 129         case 'k':
 130                 result *= 1024;
 131                 if ((*endp)[1] == 'i') {
 132                         if ((*endp)[2] == 'B')
 133                                 (*endp) += 3;
 134                         else
 135                                 (*endp) += 2;
 136                 }
 137         }
 138         return result;
 139 }
 140
 141 unsigned long long simple_strtoull(const char *cp, char **endp,
 142                                         unsigned int base)
 143 {
 144         unsigned long long result = 0, value;
 145
 146         if (*cp == '0') {
 147                 cp++;
 148                 if ((*cp == 'x') && isxdigit(cp[1])) {
 149                         base = 16;
 150                         cp++;
 151                 }
 152
 153                 if (!base)
 154                         base = 8;
 155         }
 156
 157         if (!base)
 158                 base = 10;
 159
 160         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
 161                 : (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
 162                 result = result * base + value;
 163                 cp++;
 164         }
 165
 166         if (endp)
 167                 *endp = (char *) cp;
 168
 169         return result;
 170 }
 171
 172 /* we use this so that we can do without the ctype library */
 173 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
 174
 175 static int skip_atoi(const char **s)
 176 {
 177         int i = 0;
 178
 179         while (is_digit(**s))
 180                 i = i * 10 + *((*s)++) - '0';
 181
 182         return i;
 183 }
 184
 185 /* Decimal conversion is by far the most typical, and is used
 186  * for /proc and /sys data. This directly impacts e.g. top performance
 187  * with many processes running. We optimize it for speed
 188  * using code from
 189  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 190  * (with permission from the author, Douglas W. Jones). */
 191
 192 /* Formats correctly any integer in [0,99999].
 193  * Outputs from one to five digits depending on input.
 194  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
 195 static char *put_dec_trunc(char *buf, unsigned q)
 196 {
 197         unsigned d3, d2, d1, d0;
 198         d1 = (q>>4) & 0xf;
 199         d2 = (q>>8) & 0xf;
 200         d3 = (q>>12);
 201
 202         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 203         q = (d0 * 0xcd) >> 11;
 204         d0 = d0 - 10*q;
 205         *buf++ = d0 + '0'; /* least significant digit */
 206         d1 = q + 9*d3 + 5*d2 + d1;
 207         if (d1 != 0) {
 208                 q = (d1 * 0xcd) >> 11;
 209                 d1 = d1 - 10*q;
 210                 *buf++ = d1 + '0'; /* next digit */
 211
 212                 d2 = q + 2*d2;
 213                 if ((d2 != 0) || (d3 != 0)) {
 214                         q = (d2 * 0xd) >> 7;
 215                         d2 = d2 - 10*q;
 216                         *buf++ = d2 + '0'; /* next digit */
 217
 218                         d3 = q + 4*d3;
 219                         if (d3 != 0) {
 220                                 q = (d3 * 0xcd) >> 11;
 221                                 d3 = d3 - 10*q;
 222                                 *buf++ = d3 + '0';  /* next digit */
 223                                 if (q != 0)
 224                                         *buf++ = q + '0'; /* most sign. digit */
 225                         }
 226                 }
 227         }
 228         return buf;
 229 }
 230 /* Same with if's removed. Always emits five digits */
 231 static char *put_dec_full(char *buf, unsigned q)
 232 {
 233         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
 234         /* but anyway, gcc produces better code with full-sized ints */
 235         unsigned d3, d2, d1, d0;
 236         d1 = (q>>4) & 0xf;
 237         d2 = (q>>8) & 0xf;
 238         d3 = (q>>12);
 239
 240         /*
 241          * Possible ways to approx. divide by 10
 242          * gcc -O2 replaces multiply with shifts and adds
 243          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 244          * (x * 0x67) >> 10:  1100111
 245          * (x * 0x34) >> 9:    110100 - same
 246          * (x * 0x1a) >> 8:     11010 - same
 247          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 248          */
 249
 250         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 251         q = (d0 * 0xcd) >> 11;
 252         d0 = d0 - 10*q;
 253         *buf++ = d0 + '0';
 254         d1 = q + 9*d3 + 5*d2 + d1;
 255                 q = (d1 * 0xcd) >> 11;
 256                 d1 = d1 - 10*q;
 257                 *buf++ = d1 + '0';
 258
 259                 d2 = q + 2*d2;
 260                         q = (d2 * 0xd) >> 7;
 261                         d2 = d2 - 10*q;
 262                         *buf++ = d2 + '0';
 263
 264                         d3 = q + 4*d3;
 265                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 266                                 /* q = (d3 * 0x67) >> 10; - would also work */
 267                                 d3 = d3 - 10*q;
 268                                 *buf++ = d3 + '0';
 269                                         *buf++ = q + '0';
 270         return buf;
 271 }
 272 /* No inlining helps gcc to use registers better */
 273 static noinline char *put_dec(char *buf, u64 num)
 274 {
 275         while (1) {
 276                 unsigned rem;
 277                 if (num < 100000)
 278                         return put_dec_trunc(buf, num);
 279                 rem = do_div(num, 100000);
 280                 buf = put_dec_full(buf, rem);
 281         }
 282 }
 283
 284 #define ZEROPAD 1               /* pad with zero */
 285 #define SIGN    2               /* unsigned/signed long */
 286 #define PLUS    4               /* show plus */
 287 #define SPACE   8               /* space if plus */
 288 #define LEFT    16              /* left justified */
 289 #define SMALL   32              /* Must be 32 == 0x20 */
 290 #define SPECIAL 64              /* 0x */
 291
 292 #ifdef CONFIG_SYS_VSNPRINTF
 293 /*
 294  * Macro to add a new character to our output string, but only if it will
 295  * fit. The macro moves to the next character position in the output string.
 296  */
 297 #define ADDCH(str, ch) do { \
 298         if ((str) < end) \
 299                 *(str) = (ch); \
 300         ++str; \
 301         } while (0)
 302 #else
 303 #define ADDCH(str, ch)  (*(str)++ = (ch))
 304 #endif
 305
 306 static char *number(char *buf, char *end, u64 num,
 307                 int base, int size, int precision, int type)
 308 {
 309         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 310         static const char digits[16] = "0123456789ABCDEF";
 311
 312         char tmp[66];
 313         char sign;
 314         char locase;
 315         int need_pfx = ((type & SPECIAL) && base != 10);
 316         int i;
 317
 318         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 319          * produces same digits or (maybe lowercased) letters */
 320         locase = (type & SMALL);
 321         if (type & LEFT)
 322                 type &= ~ZEROPAD;
 323         sign = 0;
 324         if (type & SIGN) {
 325                 if ((s64) num < 0) {
 326                         sign = '-';
 327                         num = -(s64) num;
 328                         size--;
 329                 } else if (type & PLUS) {
 330                         sign = '+';
 331                         size--;
 332                 } else if (type & SPACE) {
 333                         sign = ' ';
 334                         size--;
 335                 }
 336         }
 337         if (need_pfx) {
 338                 size--;
 339                 if (base == 16)
 340                         size--;
 341         }
 342
 343         /* generate full string in tmp[], in reverse order */
 344         i = 0;
 345         if (num == 0)
 346                 tmp[i++] = '0';
 347         /* Generic code, for any base:
 348         else do {
 349                 tmp[i++] = (digits[do_div(num,base)] | locase);
 350         } while (num != 0);
 351         */
 352         else if (base != 10) { /* 8 or 16 */
 353                 int mask = base - 1;
 354                 int shift = 3;
 355
 356                 if (base == 16)
 357                         shift = 4;
 358
 359                 do {
 360                         tmp[i++] = (digits[((unsigned char)num) & mask]
 361                                         | locase);
 362                         num >>= shift;
 363                 } while (num);
 364         } else { /* base 10 */
 365                 i = put_dec(tmp, num) - tmp;
 366         }
 367
 368         /* printing 100 using %2d gives "100", not "00" */
 369         if (i > precision)
 370                 precision = i;
 371         /* leading space padding */
 372         size -= precision;
 373         if (!(type & (ZEROPAD + LEFT))) {
 374                 while (--size >= 0)
 375                         ADDCH(buf, ' ');
 376         }
 377         /* sign */
 378         if (sign)
 379                 ADDCH(buf, sign);
 380         /* "0x" / "0" prefix */
 381         if (need_pfx) {
 382                 ADDCH(buf, '0');
 383                 if (base == 16)
 384                         ADDCH(buf, 'X' | locase);
 385         }
 386         /* zero or space padding */
 387         if (!(type & LEFT)) {
 388                 char c = (type & ZEROPAD) ? '0' : ' ';
 389
 390                 while (--size >= 0)
 391                         ADDCH(buf, c);
 392         }
 393         /* hmm even more zero padding? */
 394         while (i <= --precision)
 395                 ADDCH(buf, '0');
 396         /* actual digits of result */
 397         while (--i >= 0)
 398                 ADDCH(buf, tmp[i]);
 399         /* trailing space padding */
 400         while (--size >= 0)
 401                 ADDCH(buf, ' ');
 402         return buf;
 403 }
 404
 405 static char *string(char *buf, char *end, char *s, int field_width,
 406                 int precision, int flags)
 407 {
 408         int len, i;
 409
 410         if (s == NULL)
 411                 s = "<NULL>";
 412
 413         len = strnlen(s, precision);
 414
 415         if (!(flags & LEFT))
 416                 while (len < field_width--)
 417                         ADDCH(buf, ' ');
 418         for (i = 0; i < len; ++i)
 419                 ADDCH(buf, *s++);
 420         while (len < field_width--)
 421                 ADDCH(buf, ' ');
 422         return buf;
 423 }
 424
 425 #ifdef CONFIG_CMD_NET
 426 static const char hex_asc[] = "0123456789abcdef";
 427 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
 428 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
 429
 430 static inline char *pack_hex_byte(char *buf, u8 byte)
 431 {
 432         *buf++ = hex_asc_hi(byte);
 433         *buf++ = hex_asc_lo(byte);
 434         return buf;
 435 }
 436
 437 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 438                                 int precision, int flags)
 439 {
 440         /* (6 * 2 hex digits), 5 colons and trailing zero */
 441         char mac_addr[6 * 3];
 442         char *p = mac_addr;
 443         int i;
 444
 445         for (i = 0; i < 6; i++) {
 446                 p = pack_hex_byte(p, addr[i]);
 447                 if (!(flags & SPECIAL) && i != 5)
 448                         *p++ = ':';
 449         }
 450         *p = '\0';
 451
 452         return string(buf, end, mac_addr, field_width, precision,
 453                       flags & ~SPECIAL);
 454 }
 455
 456 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 457                          int precision, int flags)
 458 {
 459         /* (8 * 4 hex digits), 7 colons and trailing zero */
 460         char ip6_addr[8 * 5];
 461         char *p = ip6_addr;
 462         int i;
 463
 464         for (i = 0; i < 8; i++) {
 465                 p = pack_hex_byte(p, addr[2 * i]);
 466                 p = pack_hex_byte(p, addr[2 * i + 1]);
 467                 if (!(flags & SPECIAL) && i != 7)
 468                         *p++ = ':';
 469         }
 470         *p = '\0';
 471
 472         return string(buf, end, ip6_addr, field_width, precision,
 473                       flags & ~SPECIAL);
 474 }
 475
 476 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 477                          int precision, int flags)
 478 {
 479         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 480         char ip4_addr[4 * 4];
 481         char temp[3];   /* hold each IP quad in reverse order */
 482         char *p = ip4_addr;
 483         int i, digits;
 484
 485         for (i = 0; i < 4; i++) {
 486                 digits = put_dec_trunc(temp, addr[i]) - temp;
 487                 /* reverse the digits in the quad */
 488                 while (digits--)
 489                         *p++ = temp[digits];
 490                 if (i != 3)
 491                         *p++ = '.';
 492         }
 493         *p = '\0';
 494
 495         return string(buf, end, ip4_addr, field_width, precision,
 496                       flags & ~SPECIAL);
 497 }
 498 #endif
 499
 500 /*
 501  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 502  * by an extra set of alphanumeric characters that are extended format
 503  * specifiers.
 504  *
 505  * Right now we handle:
 506  *
 507  * - 'M' For a 6-byte MAC address, it prints the address in the
 508  *       usual colon-separated hex notation
 509  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 510  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 511  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 512  *       currently the same
 513  *
 514  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 515  * function pointers are really function descriptors, which contain a
 516  * pointer to the real address.
 517  */
 518 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 519                 int field_width, int precision, int flags)
 520 {
 521         /*
 522          * Being a boot loader, we explicitly allow pointers to
 523          * (physical) address null.
 524          */
 525 #if 0
 526         if (!ptr)
 527                 return string(buf, end, "(null)", field_width, precision,
 528                               flags);
 529 #endif
 530
 531 #ifdef CONFIG_CMD_NET
 532         switch (*fmt) {
 533         case 'm':
 534                 flags |= SPECIAL;
 535                 /* Fallthrough */
 536         case 'M':
 537                 return mac_address_string(buf, end, ptr, field_width,
 538                                           precision, flags);
 539         case 'i':
 540                 flags |= SPECIAL;
 541                 /* Fallthrough */
 542         case 'I':
 543                 if (fmt[1] == '6')
 544                         return ip6_addr_string(buf, end, ptr, field_width,
 545                                                precision, flags);
 546                 if (fmt[1] == '4')
 547                         return ip4_addr_string(buf, end, ptr, field_width,
 548                                                precision, flags);
 549                 flags &= ~SPECIAL;
 550                 break;
 551         }
 552 #endif
 553         flags |= SMALL;
 554         if (field_width == -1) {
 555                 field_width = 2*sizeof(void *);
 556                 flags |= ZEROPAD;
 557         }
 558         return number(buf, end, (unsigned long)ptr, 16, field_width,
 559                       precision, flags);
 560 }
 561
 562 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 563                               va_list args)
 564 {
 565         u64 num;
 566         int base;
 567         char *str;
 568
 569         int flags;              /* flags to number() */
 570
 571         int field_width;        /* width of output field */
 572         int precision;          /* min. # of digits for integers; max
 573                                    number of chars for from string */
 574         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 575                                 /* 'z' support added 23/7/1999 S.H.    */
 576                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 577                                 /* 't' added for ptrdiff_t */
 578         char *end = buf + size;
 579
 580 #ifdef CONFIG_SYS_VSNPRINTF
 581         /* Make sure end is always >= buf - do we want this in U-Boot? */
 582         if (end < buf) {
 583                 end = ((void *)-1);
 584                 size = end - buf;
 585         }
 586 #endif
 587         str = buf;
 588
 589         for (; *fmt ; ++fmt) {
 590                 if (*fmt != '%') {
 591                         ADDCH(str, *fmt);
 592                         continue;
 593                 }
 594
 595                 /* process flags */
 596                 flags = 0;
 597 repeat:
 598                         ++fmt;          /* this also skips first '%' */
 599                         switch (*fmt) {
 600                         case '-':
 601                                 flags |= LEFT;
 602                                 goto repeat;
 603                         case '+':
 604                                 flags |= PLUS;
 605                                 goto repeat;
 606                         case ' ':
 607                                 flags |= SPACE;
 608                                 goto repeat;
 609                         case '#':
 610                                 flags |= SPECIAL;
 611                                 goto repeat;
 612                         case '0':
 613                                 flags |= ZEROPAD;
 614                                 goto repeat;
 615                         }
 616
 617                 /* get field width */
 618                 field_width = -1;
 619                 if (is_digit(*fmt))
 620                         field_width = skip_atoi(&fmt);
 621                 else if (*fmt == '*') {
 622                         ++fmt;
 623                         /* it's the next argument */
 624                         field_width = va_arg(args, int);
 625                         if (field_width < 0) {
 626                                 field_width = -field_width;
 627                                 flags |= LEFT;
 628                         }
 629                 }
 630
 631                 /* get the precision */
 632                 precision = -1;
 633                 if (*fmt == '.') {
 634                         ++fmt;
 635                         if (is_digit(*fmt))
 636                                 precision = skip_atoi(&fmt);
 637                         else if (*fmt == '*') {
 638                                 ++fmt;
 639                                 /* it's the next argument */
 640                                 precision = va_arg(args, int);
 641                         }
 642                         if (precision < 0)
 643                                 precision = 0;
 644                 }
 645
 646                 /* get the conversion qualifier */
 647                 qualifier = -1;
 648                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 649                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 650                         qualifier = *fmt;
 651                         ++fmt;
 652                         if (qualifier == 'l' && *fmt == 'l') {
 653                                 qualifier = 'L';
 654                                 ++fmt;
 655                         }
 656                 }
 657
 658                 /* default base */
 659                 base = 10;
 660
 661                 switch (*fmt) {
 662                 case 'c':
 663                         if (!(flags & LEFT)) {
 664                                 while (--field_width > 0)
 665                                         ADDCH(str, ' ');
 666                         }
 667                         ADDCH(str, (unsigned char) va_arg(args, int));
 668                         while (--field_width > 0)
 669                                 ADDCH(str, ' ');
 670                         continue;
 671
 672                 case 's':
 673                         str = string(str, end, va_arg(args, char *),
 674                                      field_width, precision, flags);
 675                         continue;
 676
 677                 case 'p':
 678                         str = pointer(fmt + 1, str, end,
 679                                         va_arg(args, void *),
 680                                         field_width, precision, flags);
 681                         /* Skip all alphanumeric pointer suffixes */
 682                         while (isalnum(fmt[1]))
 683                                 fmt++;
 684                         continue;
 685
 686                 case 'n':
 687                         if (qualifier == 'l') {
 688                                 long *ip = va_arg(args, long *);
 689                                 *ip = (str - buf);
 690                         } else {
 691                                 int *ip = va_arg(args, int *);
 692                                 *ip = (str - buf);
 693                         }
 694                         continue;
 695
 696                 case '%':
 697                         ADDCH(str, '%');
 698                         continue;
 699
 700                 /* integer number formats - set up the flags and "break" */
 701                 case 'o':
 702                         base = 8;
 703                         break;
 704
 705                 case 'x':
 706                         flags |= SMALL;
 707                 case 'X':
 708                         base = 16;
 709                         break;
 710
 711                 case 'd':
 712                 case 'i':
 713                         flags |= SIGN;
 714                 case 'u':
 715                         break;
 716
 717                 default:
 718                         ADDCH(str, '%');
 719                         if (*fmt)
 720                                 ADDCH(str, *fmt);
 721                         else
 722                                 --fmt;
 723                         continue;
 724                 }
 725                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 726                         num = va_arg(args, unsigned long long);
 727                 else if (qualifier == 'l') {
 728                         num = va_arg(args, unsigned long);
 729                         if (flags & SIGN)
 730                                 num = (signed long) num;
 731                 } else if (qualifier == 'Z' || qualifier == 'z') {
 732                         num = va_arg(args, size_t);
 733                 } else if (qualifier == 't') {
 734                         num = va_arg(args, ptrdiff_t);
 735                 } else if (qualifier == 'h') {
 736                         num = (unsigned short) va_arg(args, int);
 737                         if (flags & SIGN)
 738                                 num = (signed short) num;
 739                 } else {
 740                         num = va_arg(args, unsigned int);
 741                         if (flags & SIGN)
 742                                 num = (signed int) num;
 743                 }
 744                 str = number(str, end, num, base, field_width, precision,
 745                              flags);
 746         }
 747
 748 #ifdef CONFIG_SYS_VSNPRINTF
 749         if (size > 0) {
 750                 ADDCH(str, '\0');
 751                 if (str > end)
 752                         end[-1] = '\0';
 753                 --str;
 754         }
 755 #else
 756         *str = '\0';
 757 #endif
 758         /* the trailing null byte doesn't count towards the total */
 759         return str - buf;
 760 }
 761
 762 #ifdef CONFIG_SYS_VSNPRINTF
 763 int vsnprintf(char *buf, size_t size, const char *fmt,
 764                               va_list args)
 765 {
 766         return vsnprintf_internal(buf, size, fmt, args);
 767 }
 768
 769 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 770 {
 771         int i;
 772
 773         i = vsnprintf(buf, size, fmt, args);
 774
 775         if (likely(i < size))
 776                 return i;
 777         if (size != 0)
 778                 return size - 1;
 779         return 0;
 780 }
 781
 782 int snprintf(char *buf, size_t size, const char *fmt, ...)
 783 {
 784         va_list args;
 785         int i;
 786
 787         va_start(args, fmt);
 788         i = vsnprintf(buf, size, fmt, args);
 789         va_end(args);
 790
 791         return i;
 792 }
 793
 794 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 795 {
 796         va_list args;
 797         int i;
 798
 799         va_start(args, fmt);
 800         i = vscnprintf(buf, size, fmt, args);
 801         va_end(args);
 802
 803         return i;
 804 }
 805 #endif /* CONFIG_SYS_VSNPRINT */
 806
 807 /**
 808  * Format a string and place it in a buffer (va_list version)
 809  *
 810  * @param buf   The buffer to place the result into
 811  * @param fmt   The format string to use
 812  * @param args  Arguments for the format string
 813  *
 814  * The function returns the number of characters written
 815  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 816  * buffer overflows.
 817  *
 818  * If you're not already dealing with a va_list consider using sprintf().
 819  */
 820 int vsprintf(char *buf, const char *fmt, va_list args)
 821 {
 822         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 823 }
 824
 825 int sprintf(char *buf, const char *fmt, ...)
 826 {
 827         va_list args;
 828         int i;
 829
 830         va_start(args, fmt);
 831         i = vsprintf(buf, fmt, args);
 832         va_end(args);
 833         return i;
 834 }
 835
 836 void panic(const char *fmt, ...)
 837 {
 838         va_list args;
 839         va_start(args, fmt);
 840         vprintf(fmt, args);
 841         putc('\n');
 842         va_end(args);
 843 #if defined(CONFIG_PANIC_HANG)
 844         hang();
 845 #else
 846         udelay(100000); /* allow messages to go out */
 847         do_reset(NULL, 0, 0, NULL);
 848 #endif
 849         while (1)
 850                 ;
 851 }
 852
 853 void __assert_fail(const char *assertion, const char *file, unsigned line,
 854                    const char *function)
 855 {
 856         /* This will not return */
 857         panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
 858               assertion);
 859 }
 860
 861 char *simple_itoa(ulong i)
 862 {
 863         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 864         static char local[22];
 865         char *p = &local[21];
 866
 867         *p-- = '\0';
 868         do {
 869                 *p-- = '0' + i % 10;
 870                 i /= 10;
 871         } while (i > 0);
 872         return p + 1;
 873 }
 874
 875 /* We don't seem to have %'d in U-Boot */
 876 void print_grouped_ull(unsigned long long int_val, int digits)
 877 {
 878         char str[21], *s;
 879         int grab = 3;
 880
 881         digits = (digits + 2) / 3;
 882         sprintf(str, "%*llu", digits * 3, int_val);
 883         for (s = str; *s; s += grab) {
 884                 if (s != str)
 885                         putc(s[-1] != ' ' ? ',' : ' ');
 886                 printf("%.*s", grab, s);
 887                 grab = 3;
 888         }
 889 }