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 unsigned long simple_strtoul(const char *cp, char **endp,
  29                                 unsigned int base)
  30 {
  31         unsigned long result = 0;
  32         unsigned long value;
  33
  34         if (*cp == '0') {
  35                 cp++;
  36                 if ((*cp == 'x') && isxdigit(cp[1])) {
  37                         base = 16;
  38                         cp++;
  39                 }
  40
  41                 if (!base)
  42                         base = 8;
  43         }
  44
  45         if (!base)
  46                 base = 10;
  47
  48         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  49             ? toupper(*cp) : *cp)-'A'+10) < base) {
  50                 result = result*base + value;
  51                 cp++;
  52         }
  53
  54         if (endp)
  55                 *endp = (char *)cp;
  56
  57         return result;
  58 }
  59
  60 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
  61 {
  62         char *tail;
  63         unsigned long val;
  64         size_t len;
  65
  66         *res = 0;
  67         len = strlen(cp);
  68         if (len == 0)
  69                 return -EINVAL;
  70
  71         val = simple_strtoul(cp, &tail, base);
  72         if (tail == cp)
  73                 return -EINVAL;
  74
  75         if ((*tail == '\0') ||
  76                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
  77                 *res = val;
  78                 return 0;
  79         }
  80
  81         return -EINVAL;
  82 }
  83
  84 long simple_strtol(const char *cp, char **endp, unsigned int base)
  85 {
  86         if (*cp == '-')
  87                 return -simple_strtoul(cp + 1, endp, base);
  88
  89         return simple_strtoul(cp, endp, base);
  90 }
  91
  92 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
  93 {
  94         unsigned long result = simple_strtoul(cp, endp, base);
  95         switch (**endp) {
  96         case 'G':
  97                 result *= 1024;
  98                 /* fall through */
  99         case 'M':
 100                 result *= 1024;
 101                 /* fall through */
 102         case 'K':
 103         case 'k':
 104                 result *= 1024;
 105                 if ((*endp)[1] == 'i') {
 106                         if ((*endp)[2] == 'B')
 107                                 (*endp) += 3;
 108                         else
 109                                 (*endp) += 2;
 110                 }
 111         }
 112         return result;
 113 }
 114
 115 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
 116 {
 117         unsigned long long result = simple_strtoull(cp, endp, base);
 118         switch (**endp) {
 119         case 'G':
 120                 result *= 1024;
 121                 /* fall through */
 122         case 'M':
 123                 result *= 1024;
 124                 /* fall through */
 125         case 'K':
 126         case 'k':
 127                 result *= 1024;
 128                 if ((*endp)[1] == 'i') {
 129                         if ((*endp)[2] == 'B')
 130                                 (*endp) += 3;
 131                         else
 132                                 (*endp) += 2;
 133                 }
 134         }
 135         return result;
 136 }
 137
 138 unsigned long long simple_strtoull(const char *cp, char **endp,
 139                                         unsigned int base)
 140 {
 141         unsigned long long result = 0, value;
 142
 143         if (*cp == '0') {
 144                 cp++;
 145                 if ((*cp == 'x') && isxdigit(cp[1])) {
 146                         base = 16;
 147                         cp++;
 148                 }
 149
 150                 if (!base)
 151                         base = 8;
 152         }
 153
 154         if (!base)
 155                 base = 10;
 156
 157         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
 158                 : (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
 159                 result = result * base + value;
 160                 cp++;
 161         }
 162
 163         if (endp)
 164                 *endp = (char *) cp;
 165
 166         return result;
 167 }
 168
 169 /* we use this so that we can do without the ctype library */
 170 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
 171
 172 static int skip_atoi(const char **s)
 173 {
 174         int i = 0;
 175
 176         while (is_digit(**s))
 177                 i = i * 10 + *((*s)++) - '0';
 178
 179         return i;
 180 }
 181
 182 /* Decimal conversion is by far the most typical, and is used
 183  * for /proc and /sys data. This directly impacts e.g. top performance
 184  * with many processes running. We optimize it for speed
 185  * using code from
 186  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 187  * (with permission from the author, Douglas W. Jones). */
 188
 189 /* Formats correctly any integer in [0,99999].
 190  * Outputs from one to five digits depending on input.
 191  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
 192 static char *put_dec_trunc(char *buf, unsigned q)
 193 {
 194         unsigned d3, d2, d1, d0;
 195         d1 = (q>>4) & 0xf;
 196         d2 = (q>>8) & 0xf;
 197         d3 = (q>>12);
 198
 199         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 200         q = (d0 * 0xcd) >> 11;
 201         d0 = d0 - 10*q;
 202         *buf++ = d0 + '0'; /* least significant digit */
 203         d1 = q + 9*d3 + 5*d2 + d1;
 204         if (d1 != 0) {
 205                 q = (d1 * 0xcd) >> 11;
 206                 d1 = d1 - 10*q;
 207                 *buf++ = d1 + '0'; /* next digit */
 208
 209                 d2 = q + 2*d2;
 210                 if ((d2 != 0) || (d3 != 0)) {
 211                         q = (d2 * 0xd) >> 7;
 212                         d2 = d2 - 10*q;
 213                         *buf++ = d2 + '0'; /* next digit */
 214
 215                         d3 = q + 4*d3;
 216                         if (d3 != 0) {
 217                                 q = (d3 * 0xcd) >> 11;
 218                                 d3 = d3 - 10*q;
 219                                 *buf++ = d3 + '0';  /* next digit */
 220                                 if (q != 0)
 221                                         *buf++ = q + '0'; /* most sign. digit */
 222                         }
 223                 }
 224         }
 225         return buf;
 226 }
 227 /* Same with if's removed. Always emits five digits */
 228 static char *put_dec_full(char *buf, unsigned q)
 229 {
 230         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
 231         /* but anyway, gcc produces better code with full-sized ints */
 232         unsigned d3, d2, d1, d0;
 233         d1 = (q>>4) & 0xf;
 234         d2 = (q>>8) & 0xf;
 235         d3 = (q>>12);
 236
 237         /*
 238          * Possible ways to approx. divide by 10
 239          * gcc -O2 replaces multiply with shifts and adds
 240          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 241          * (x * 0x67) >> 10:  1100111
 242          * (x * 0x34) >> 9:    110100 - same
 243          * (x * 0x1a) >> 8:     11010 - same
 244          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 245          */
 246
 247         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 248         q = (d0 * 0xcd) >> 11;
 249         d0 = d0 - 10*q;
 250         *buf++ = d0 + '0';
 251         d1 = q + 9*d3 + 5*d2 + d1;
 252                 q = (d1 * 0xcd) >> 11;
 253                 d1 = d1 - 10*q;
 254                 *buf++ = d1 + '0';
 255
 256                 d2 = q + 2*d2;
 257                         q = (d2 * 0xd) >> 7;
 258                         d2 = d2 - 10*q;
 259                         *buf++ = d2 + '0';
 260
 261                         d3 = q + 4*d3;
 262                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 263                                 /* q = (d3 * 0x67) >> 10; - would also work */
 264                                 d3 = d3 - 10*q;
 265                                 *buf++ = d3 + '0';
 266                                         *buf++ = q + '0';
 267         return buf;
 268 }
 269 /* No inlining helps gcc to use registers better */
 270 static noinline char *put_dec(char *buf, uint64_t num)
 271 {
 272         while (1) {
 273                 unsigned rem;
 274                 if (num < 100000)
 275                         return put_dec_trunc(buf, num);
 276                 rem = do_div(num, 100000);
 277                 buf = put_dec_full(buf, rem);
 278         }
 279 }
 280
 281 #define ZEROPAD 1               /* pad with zero */
 282 #define SIGN    2               /* unsigned/signed long */
 283 #define PLUS    4               /* show plus */
 284 #define SPACE   8               /* space if plus */
 285 #define LEFT    16              /* left justified */
 286 #define SMALL   32              /* Must be 32 == 0x20 */
 287 #define SPECIAL 64              /* 0x */
 288
 289 #ifdef CONFIG_SYS_VSNPRINTF
 290 /*
 291  * Macro to add a new character to our output string, but only if it will
 292  * fit. The macro moves to the next character position in the output string.
 293  */
 294 #define ADDCH(str, ch) do { \
 295         if ((str) < end) \
 296                 *(str) = (ch); \
 297         ++str; \
 298         } while (0)
 299 #else
 300 #define ADDCH(str, ch)  (*(str)++ = (ch))
 301 #endif
 302
 303 static char *number(char *buf, char *end, u64 num,
 304                 int base, int size, int precision, int type)
 305 {
 306         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 307         static const char digits[16] = "0123456789ABCDEF";
 308
 309         char tmp[66];
 310         char sign;
 311         char locase;
 312         int need_pfx = ((type & SPECIAL) && base != 10);
 313         int i;
 314
 315         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 316          * produces same digits or (maybe lowercased) letters */
 317         locase = (type & SMALL);
 318         if (type & LEFT)
 319                 type &= ~ZEROPAD;
 320         sign = 0;
 321         if (type & SIGN) {
 322                 if ((s64) num < 0) {
 323                         sign = '-';
 324                         num = -(s64) num;
 325                         size--;
 326                 } else if (type & PLUS) {
 327                         sign = '+';
 328                         size--;
 329                 } else if (type & SPACE) {
 330                         sign = ' ';
 331                         size--;
 332                 }
 333         }
 334         if (need_pfx) {
 335                 size--;
 336                 if (base == 16)
 337                         size--;
 338         }
 339
 340         /* generate full string in tmp[], in reverse order */
 341         i = 0;
 342         if (num == 0)
 343                 tmp[i++] = '0';
 344         /* Generic code, for any base:
 345         else do {
 346                 tmp[i++] = (digits[do_div(num,base)] | locase);
 347         } while (num != 0);
 348         */
 349         else if (base != 10) { /* 8 or 16 */
 350                 int mask = base - 1;
 351                 int shift = 3;
 352
 353                 if (base == 16)
 354                         shift = 4;
 355
 356                 do {
 357                         tmp[i++] = (digits[((unsigned char)num) & mask]
 358                                         | locase);
 359                         num >>= shift;
 360                 } while (num);
 361         } else { /* base 10 */
 362                 i = put_dec(tmp, num) - tmp;
 363         }
 364
 365         /* printing 100 using %2d gives "100", not "00" */
 366         if (i > precision)
 367                 precision = i;
 368         /* leading space padding */
 369         size -= precision;
 370         if (!(type & (ZEROPAD + LEFT))) {
 371                 while (--size >= 0)
 372                         ADDCH(buf, ' ');
 373         }
 374         /* sign */
 375         if (sign)
 376                 ADDCH(buf, sign);
 377         /* "0x" / "0" prefix */
 378         if (need_pfx) {
 379                 ADDCH(buf, '0');
 380                 if (base == 16)
 381                         ADDCH(buf, 'X' | locase);
 382         }
 383         /* zero or space padding */
 384         if (!(type & LEFT)) {
 385                 char c = (type & ZEROPAD) ? '0' : ' ';
 386
 387                 while (--size >= 0)
 388                         ADDCH(buf, c);
 389         }
 390         /* hmm even more zero padding? */
 391         while (i <= --precision)
 392                 ADDCH(buf, '0');
 393         /* actual digits of result */
 394         while (--i >= 0)
 395                 ADDCH(buf, tmp[i]);
 396         /* trailing space padding */
 397         while (--size >= 0)
 398                 ADDCH(buf, ' ');
 399         return buf;
 400 }
 401
 402 static char *string(char *buf, char *end, char *s, int field_width,
 403                 int precision, int flags)
 404 {
 405         int len, i;
 406
 407         if (s == NULL)
 408                 s = "<NULL>";
 409
 410         len = strnlen(s, precision);
 411
 412         if (!(flags & LEFT))
 413                 while (len < field_width--)
 414                         ADDCH(buf, ' ');
 415         for (i = 0; i < len; ++i)
 416                 ADDCH(buf, *s++);
 417         while (len < field_width--)
 418                 ADDCH(buf, ' ');
 419         return buf;
 420 }
 421
 422 #ifdef CONFIG_CMD_NET
 423 static const char hex_asc[] = "0123456789abcdef";
 424 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
 425 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
 426
 427 static inline char *pack_hex_byte(char *buf, u8 byte)
 428 {
 429         *buf++ = hex_asc_hi(byte);
 430         *buf++ = hex_asc_lo(byte);
 431         return buf;
 432 }
 433
 434 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 435                                 int precision, int flags)
 436 {
 437         /* (6 * 2 hex digits), 5 colons and trailing zero */
 438         char mac_addr[6 * 3];
 439         char *p = mac_addr;
 440         int i;
 441
 442         for (i = 0; i < 6; i++) {
 443                 p = pack_hex_byte(p, addr[i]);
 444                 if (!(flags & SPECIAL) && i != 5)
 445                         *p++ = ':';
 446         }
 447         *p = '\0';
 448
 449         return string(buf, end, mac_addr, field_width, precision,
 450                       flags & ~SPECIAL);
 451 }
 452
 453 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 454                          int precision, int flags)
 455 {
 456         /* (8 * 4 hex digits), 7 colons and trailing zero */
 457         char ip6_addr[8 * 5];
 458         char *p = ip6_addr;
 459         int i;
 460
 461         for (i = 0; i < 8; i++) {
 462                 p = pack_hex_byte(p, addr[2 * i]);
 463                 p = pack_hex_byte(p, addr[2 * i + 1]);
 464                 if (!(flags & SPECIAL) && i != 7)
 465                         *p++ = ':';
 466         }
 467         *p = '\0';
 468
 469         return string(buf, end, ip6_addr, field_width, precision,
 470                       flags & ~SPECIAL);
 471 }
 472
 473 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 474                          int precision, int flags)
 475 {
 476         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 477         char ip4_addr[4 * 4];
 478         char temp[3];   /* hold each IP quad in reverse order */
 479         char *p = ip4_addr;
 480         int i, digits;
 481
 482         for (i = 0; i < 4; i++) {
 483                 digits = put_dec_trunc(temp, addr[i]) - temp;
 484                 /* reverse the digits in the quad */
 485                 while (digits--)
 486                         *p++ = temp[digits];
 487                 if (i != 3)
 488                         *p++ = '.';
 489         }
 490         *p = '\0';
 491
 492         return string(buf, end, ip4_addr, field_width, precision,
 493                       flags & ~SPECIAL);
 494 }
 495 #endif
 496
 497 /*
 498  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 499  * by an extra set of alphanumeric characters that are extended format
 500  * specifiers.
 501  *
 502  * Right now we handle:
 503  *
 504  * - 'M' For a 6-byte MAC address, it prints the address in the
 505  *       usual colon-separated hex notation
 506  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 507  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 508  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 509  *       currently the same
 510  *
 511  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 512  * function pointers are really function descriptors, which contain a
 513  * pointer to the real address.
 514  */
 515 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 516                 int field_width, int precision, int flags)
 517 {
 518         /*
 519          * Being a boot loader, we explicitly allow pointers to
 520          * (physical) address null.
 521          */
 522 #if 0
 523         if (!ptr)
 524                 return string(buf, end, "(null)", field_width, precision,
 525                               flags);
 526 #endif
 527
 528 #ifdef CONFIG_CMD_NET
 529         switch (*fmt) {
 530         case 'm':
 531                 flags |= SPECIAL;
 532                 /* Fallthrough */
 533         case 'M':
 534                 return mac_address_string(buf, end, ptr, field_width,
 535                                           precision, flags);
 536         case 'i':
 537                 flags |= SPECIAL;
 538                 /* Fallthrough */
 539         case 'I':
 540                 if (fmt[1] == '6')
 541                         return ip6_addr_string(buf, end, ptr, field_width,
 542                                                precision, flags);
 543                 if (fmt[1] == '4')
 544                         return ip4_addr_string(buf, end, ptr, field_width,
 545                                                precision, flags);
 546                 flags &= ~SPECIAL;
 547                 break;
 548         }
 549 #endif
 550         flags |= SMALL;
 551         if (field_width == -1) {
 552                 field_width = 2*sizeof(void *);
 553                 flags |= ZEROPAD;
 554         }
 555         return number(buf, end, (unsigned long)ptr, 16, field_width,
 556                       precision, flags);
 557 }
 558
 559 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 560                               va_list args)
 561 {
 562         u64 num;
 563         int base;
 564         char *str;
 565
 566         int flags;              /* flags to number() */
 567
 568         int field_width;        /* width of output field */
 569         int precision;          /* min. # of digits for integers; max
 570                                    number of chars for from string */
 571         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 572                                 /* 'z' support added 23/7/1999 S.H.    */
 573                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 574                                 /* 't' added for ptrdiff_t */
 575         char *end = buf + size;
 576
 577 #ifdef CONFIG_SYS_VSNPRINTF
 578         /* Make sure end is always >= buf - do we want this in U-Boot? */
 579         if (end < buf) {
 580                 end = ((void *)-1);
 581                 size = end - buf;
 582         }
 583 #endif
 584         str = buf;
 585
 586         for (; *fmt ; ++fmt) {
 587                 if (*fmt != '%') {
 588                         ADDCH(str, *fmt);
 589                         continue;
 590                 }
 591
 592                 /* process flags */
 593                 flags = 0;
 594 repeat:
 595                         ++fmt;          /* this also skips first '%' */
 596                         switch (*fmt) {
 597                         case '-':
 598                                 flags |= LEFT;
 599                                 goto repeat;
 600                         case '+':
 601                                 flags |= PLUS;
 602                                 goto repeat;
 603                         case ' ':
 604                                 flags |= SPACE;
 605                                 goto repeat;
 606                         case '#':
 607                                 flags |= SPECIAL;
 608                                 goto repeat;
 609                         case '0':
 610                                 flags |= ZEROPAD;
 611                                 goto repeat;
 612                         }
 613
 614                 /* get field width */
 615                 field_width = -1;
 616                 if (is_digit(*fmt))
 617                         field_width = skip_atoi(&fmt);
 618                 else if (*fmt == '*') {
 619                         ++fmt;
 620                         /* it's the next argument */
 621                         field_width = va_arg(args, int);
 622                         if (field_width < 0) {
 623                                 field_width = -field_width;
 624                                 flags |= LEFT;
 625                         }
 626                 }
 627
 628                 /* get the precision */
 629                 precision = -1;
 630                 if (*fmt == '.') {
 631                         ++fmt;
 632                         if (is_digit(*fmt))
 633                                 precision = skip_atoi(&fmt);
 634                         else if (*fmt == '*') {
 635                                 ++fmt;
 636                                 /* it's the next argument */
 637                                 precision = va_arg(args, int);
 638                         }
 639                         if (precision < 0)
 640                                 precision = 0;
 641                 }
 642
 643                 /* get the conversion qualifier */
 644                 qualifier = -1;
 645                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 646                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 647                         qualifier = *fmt;
 648                         ++fmt;
 649                         if (qualifier == 'l' && *fmt == 'l') {
 650                                 qualifier = 'L';
 651                                 ++fmt;
 652                         }
 653                 }
 654
 655                 /* default base */
 656                 base = 10;
 657
 658                 switch (*fmt) {
 659                 case 'c':
 660                         if (!(flags & LEFT)) {
 661                                 while (--field_width > 0)
 662                                         ADDCH(str, ' ');
 663                         }
 664                         ADDCH(str, (unsigned char) va_arg(args, int));
 665                         while (--field_width > 0)
 666                                 ADDCH(str, ' ');
 667                         continue;
 668
 669                 case 's':
 670                         str = string(str, end, va_arg(args, char *),
 671                                      field_width, precision, flags);
 672                         continue;
 673
 674                 case 'p':
 675                         str = pointer(fmt + 1, str, end,
 676                                         va_arg(args, void *),
 677                                         field_width, precision, flags);
 678                         /* Skip all alphanumeric pointer suffixes */
 679                         while (isalnum(fmt[1]))
 680                                 fmt++;
 681                         continue;
 682
 683                 case 'n':
 684                         if (qualifier == 'l') {
 685                                 long *ip = va_arg(args, long *);
 686                                 *ip = (str - buf);
 687                         } else {
 688                                 int *ip = va_arg(args, int *);
 689                                 *ip = (str - buf);
 690                         }
 691                         continue;
 692
 693                 case '%':
 694                         ADDCH(str, '%');
 695                         continue;
 696
 697                 /* integer number formats - set up the flags and "break" */
 698                 case 'o':
 699                         base = 8;
 700                         break;
 701
 702                 case 'x':
 703                         flags |= SMALL;
 704                 case 'X':
 705                         base = 16;
 706                         break;
 707
 708                 case 'd':
 709                 case 'i':
 710                         flags |= SIGN;
 711                 case 'u':
 712                         break;
 713
 714                 default:
 715                         ADDCH(str, '%');
 716                         if (*fmt)
 717                                 ADDCH(str, *fmt);
 718                         else
 719                                 --fmt;
 720                         continue;
 721                 }
 722                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 723                         num = va_arg(args, unsigned long long);
 724                 else if (qualifier == 'l') {
 725                         num = va_arg(args, unsigned long);
 726                         if (flags & SIGN)
 727                                 num = (signed long) num;
 728                 } else if (qualifier == 'Z' || qualifier == 'z') {
 729                         num = va_arg(args, size_t);
 730                 } else if (qualifier == 't') {
 731                         num = va_arg(args, ptrdiff_t);
 732                 } else if (qualifier == 'h') {
 733                         num = (unsigned short) va_arg(args, int);
 734                         if (flags & SIGN)
 735                                 num = (signed short) num;
 736                 } else {
 737                         num = va_arg(args, unsigned int);
 738                         if (flags & SIGN)
 739                                 num = (signed int) num;
 740                 }
 741                 str = number(str, end, num, base, field_width, precision,
 742                              flags);
 743         }
 744
 745 #ifdef CONFIG_SYS_VSNPRINTF
 746         if (size > 0) {
 747                 ADDCH(str, '\0');
 748                 if (str > end)
 749                         end[-1] = '\0';
 750                 --str;
 751         }
 752 #else
 753         *str = '\0';
 754 #endif
 755         /* the trailing null byte doesn't count towards the total */
 756         return str - buf;
 757 }
 758
 759 #ifdef CONFIG_SYS_VSNPRINTF
 760 int vsnprintf(char *buf, size_t size, const char *fmt,
 761                               va_list args)
 762 {
 763         return vsnprintf_internal(buf, size, fmt, args);
 764 }
 765
 766 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 767 {
 768         int i;
 769
 770         i = vsnprintf(buf, size, fmt, args);
 771
 772         if (likely(i < size))
 773                 return i;
 774         if (size != 0)
 775                 return size - 1;
 776         return 0;
 777 }
 778
 779 int snprintf(char *buf, size_t size, const char *fmt, ...)
 780 {
 781         va_list args;
 782         int i;
 783
 784         va_start(args, fmt);
 785         i = vsnprintf(buf, size, fmt, args);
 786         va_end(args);
 787
 788         return i;
 789 }
 790
 791 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 792 {
 793         va_list args;
 794         int i;
 795
 796         va_start(args, fmt);
 797         i = vscnprintf(buf, size, fmt, args);
 798         va_end(args);
 799
 800         return i;
 801 }
 802 #endif /* CONFIG_SYS_VSNPRINT */
 803
 804 /**
 805  * Format a string and place it in a buffer (va_list version)
 806  *
 807  * @param buf   The buffer to place the result into
 808  * @param fmt   The format string to use
 809  * @param args  Arguments for the format string
 810  *
 811  * The function returns the number of characters written
 812  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 813  * buffer overflows.
 814  *
 815  * If you're not already dealing with a va_list consider using sprintf().
 816  */
 817 int vsprintf(char *buf, const char *fmt, va_list args)
 818 {
 819         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 820 }
 821
 822 int sprintf(char *buf, const char *fmt, ...)
 823 {
 824         va_list args;
 825         int i;
 826
 827         va_start(args, fmt);
 828         i = vsprintf(buf, fmt, args);
 829         va_end(args);
 830         return i;
 831 }
 832
 833 void panic(const char *fmt, ...)
 834 {
 835         va_list args;
 836         va_start(args, fmt);
 837         vprintf(fmt, args);
 838         putc('\n');
 839         va_end(args);
 840 #if defined(CONFIG_PANIC_HANG)
 841         hang();
 842 #else
 843         udelay(100000); /* allow messages to go out */
 844         do_reset(NULL, 0, 0, NULL);
 845 #endif
 846         while (1)
 847                 ;
 848 }
 849
 850 void __assert_fail(const char *assertion, const char *file, unsigned line,
 851                    const char *function)
 852 {
 853         /* This will not return */
 854         panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
 855               assertion);
 856 }
 857
 858 char *simple_itoa(ulong i)
 859 {
 860         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 861         static char local[22];
 862         char *p = &local[21];
 863
 864         *p-- = '\0';
 865         do {
 866                 *p-- = '0' + i % 10;
 867                 i /= 10;
 868         } while (i > 0);
 869         return p + 1;
 870 }
 871
 872 /* We don't seem to have %'d in U-Boot */
 873 void print_grouped_ull(unsigned long long int_val, int digits)
 874 {
 875         char str[21], *s;
 876         int grab = 3;
 877
 878         digits = (digits + 2) / 3;
 879         sprintf(str, "%*llu", digits * 3, int_val);
 880         for (s = str; *s; s += grab) {
 881                 if (s != str)
 882                         putc(s[-1] != ' ' ? ',' : ' ');
 883                 printf("%.*s", grab, s);
 884                 grab = 3;
 885         }
 886 }