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 <common.h>
  15 #include <charset.h>
  16 #include <efi_loader.h>
  17 #include <div64.h>
  18 #include <uuid.h>
  19 #include <stdarg.h>
  20 #include <linux/ctype.h>
  21 #include <linux/err.h>
  22 #include <linux/types.h>
  23 #include <linux/string.h>
  24
  25 #define noinline __attribute__((noinline))
  26
  27 /* we use this so that we can do without the ctype library */
  28 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  29
  30 static int skip_atoi(const char **s)
  31 {
  32         int i = 0;
  33
  34         while (is_digit(**s))
  35                 i = i * 10 + *((*s)++) - '0';
  36
  37         return i;
  38 }
  39
  40 /* Decimal conversion is by far the most typical, and is used
  41  * for /proc and /sys data. This directly impacts e.g. top performance
  42  * with many processes running. We optimize it for speed
  43  * using code from
  44  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  45  * (with permission from the author, Douglas W. Jones). */
  46
  47 /* Formats correctly any integer in [0,99999].
  48  * Outputs from one to five digits depending on input.
  49  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  50 static char *put_dec_trunc(char *buf, unsigned q)
  51 {
  52         unsigned d3, d2, d1, d0;
  53         d1 = (q>>4) & 0xf;
  54         d2 = (q>>8) & 0xf;
  55         d3 = (q>>12);
  56
  57         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  58         q = (d0 * 0xcd) >> 11;
  59         d0 = d0 - 10*q;
  60         *buf++ = d0 + '0'; /* least significant digit */
  61         d1 = q + 9*d3 + 5*d2 + d1;
  62         if (d1 != 0) {
  63                 q = (d1 * 0xcd) >> 11;
  64                 d1 = d1 - 10*q;
  65                 *buf++ = d1 + '0'; /* next digit */
  66
  67                 d2 = q + 2*d2;
  68                 if ((d2 != 0) || (d3 != 0)) {
  69                         q = (d2 * 0xd) >> 7;
  70                         d2 = d2 - 10*q;
  71                         *buf++ = d2 + '0'; /* next digit */
  72
  73                         d3 = q + 4*d3;
  74                         if (d3 != 0) {
  75                                 q = (d3 * 0xcd) >> 11;
  76                                 d3 = d3 - 10*q;
  77                                 *buf++ = d3 + '0';  /* next digit */
  78                                 if (q != 0)
  79                                         *buf++ = q + '0'; /* most sign. digit */
  80                         }
  81                 }
  82         }
  83         return buf;
  84 }
  85 /* Same with if's removed. Always emits five digits */
  86 static char *put_dec_full(char *buf, unsigned q)
  87 {
  88         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  89         /* but anyway, gcc produces better code with full-sized ints */
  90         unsigned d3, d2, d1, d0;
  91         d1 = (q>>4) & 0xf;
  92         d2 = (q>>8) & 0xf;
  93         d3 = (q>>12);
  94
  95         /*
  96          * Possible ways to approx. divide by 10
  97          * gcc -O2 replaces multiply with shifts and adds
  98          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
  99          * (x * 0x67) >> 10:  1100111
 100          * (x * 0x34) >> 9:    110100 - same
 101          * (x * 0x1a) >> 8:     11010 - same
 102          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 103          */
 104
 105         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 106         q = (d0 * 0xcd) >> 11;
 107         d0 = d0 - 10*q;
 108         *buf++ = d0 + '0';
 109         d1 = q + 9*d3 + 5*d2 + d1;
 110                 q = (d1 * 0xcd) >> 11;
 111                 d1 = d1 - 10*q;
 112                 *buf++ = d1 + '0';
 113
 114                 d2 = q + 2*d2;
 115                         q = (d2 * 0xd) >> 7;
 116                         d2 = d2 - 10*q;
 117                         *buf++ = d2 + '0';
 118
 119                         d3 = q + 4*d3;
 120                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 121                                 /* q = (d3 * 0x67) >> 10; - would also work */
 122                                 d3 = d3 - 10*q;
 123                                 *buf++ = d3 + '0';
 124                                         *buf++ = q + '0';
 125         return buf;
 126 }
 127 /* No inlining helps gcc to use registers better */
 128 static noinline char *put_dec(char *buf, uint64_t num)
 129 {
 130         while (1) {
 131                 unsigned rem;
 132                 if (num < 100000)
 133                         return put_dec_trunc(buf, num);
 134                 rem = do_div(num, 100000);
 135                 buf = put_dec_full(buf, rem);
 136         }
 137 }
 138
 139 #define ZEROPAD 1               /* pad with zero */
 140 #define SIGN    2               /* unsigned/signed long */
 141 #define PLUS    4               /* show plus */
 142 #define SPACE   8               /* space if plus */
 143 #define LEFT    16              /* left justified */
 144 #define SMALL   32              /* Must be 32 == 0x20 */
 145 #define SPECIAL 64              /* 0x */
 146
 147 /*
 148  * Macro to add a new character to our output string, but only if it will
 149  * fit. The macro moves to the next character position in the output string.
 150  */
 151 #define ADDCH(str, ch) do { \
 152         if ((str) < end) \
 153                 *(str) = (ch); \
 154         ++str; \
 155         } while (0)
 156
 157 static char *number(char *buf, char *end, u64 num,
 158                 int base, int size, int precision, int type)
 159 {
 160         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 161         static const char digits[16] = "0123456789ABCDEF";
 162
 163         char tmp[66];
 164         char sign;
 165         char locase;
 166         int need_pfx = ((type & SPECIAL) && base != 10);
 167         int i;
 168
 169         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 170          * produces same digits or (maybe lowercased) letters */
 171         locase = (type & SMALL);
 172         if (type & LEFT)
 173                 type &= ~ZEROPAD;
 174         sign = 0;
 175         if (type & SIGN) {
 176                 if ((s64) num < 0) {
 177                         sign = '-';
 178                         num = -(s64) num;
 179                         size--;
 180                 } else if (type & PLUS) {
 181                         sign = '+';
 182                         size--;
 183                 } else if (type & SPACE) {
 184                         sign = ' ';
 185                         size--;
 186                 }
 187         }
 188         if (need_pfx) {
 189                 size--;
 190                 if (base == 16)
 191                         size--;
 192         }
 193
 194         /* generate full string in tmp[], in reverse order */
 195         i = 0;
 196         if (num == 0)
 197                 tmp[i++] = '0';
 198         /* Generic code, for any base:
 199         else do {
 200                 tmp[i++] = (digits[do_div(num,base)] | locase);
 201         } while (num != 0);
 202         */
 203         else if (base != 10) { /* 8 or 16 */
 204                 int mask = base - 1;
 205                 int shift = 3;
 206
 207                 if (base == 16)
 208                         shift = 4;
 209
 210                 do {
 211                         tmp[i++] = (digits[((unsigned char)num) & mask]
 212                                         | locase);
 213                         num >>= shift;
 214                 } while (num);
 215         } else { /* base 10 */
 216                 i = put_dec(tmp, num) - tmp;
 217         }
 218
 219         /* printing 100 using %2d gives "100", not "00" */
 220         if (i > precision)
 221                 precision = i;
 222         /* leading space padding */
 223         size -= precision;
 224         if (!(type & (ZEROPAD + LEFT))) {
 225                 while (--size >= 0)
 226                         ADDCH(buf, ' ');
 227         }
 228         /* sign */
 229         if (sign)
 230                 ADDCH(buf, sign);
 231         /* "0x" / "0" prefix */
 232         if (need_pfx) {
 233                 ADDCH(buf, '0');
 234                 if (base == 16)
 235                         ADDCH(buf, 'X' | locase);
 236         }
 237         /* zero or space padding */
 238         if (!(type & LEFT)) {
 239                 char c = (type & ZEROPAD) ? '0' : ' ';
 240
 241                 while (--size >= 0)
 242                         ADDCH(buf, c);
 243         }
 244         /* hmm even more zero padding? */
 245         while (i <= --precision)
 246                 ADDCH(buf, '0');
 247         /* actual digits of result */
 248         while (--i >= 0)
 249                 ADDCH(buf, tmp[i]);
 250         /* trailing space padding */
 251         while (--size >= 0)
 252                 ADDCH(buf, ' ');
 253         return buf;
 254 }
 255
 256 static char *string(char *buf, char *end, char *s, int field_width,
 257                 int precision, int flags)
 258 {
 259         int len, i;
 260
 261         if (s == NULL)
 262                 s = "<NULL>";
 263
 264         len = strnlen(s, precision);
 265
 266         if (!(flags & LEFT))
 267                 while (len < field_width--)
 268                         ADDCH(buf, ' ');
 269         for (i = 0; i < len; ++i)
 270                 ADDCH(buf, *s++);
 271         while (len < field_width--)
 272                 ADDCH(buf, ' ');
 273         return buf;
 274 }
 275
 276 static char *string16(char *buf, char *end, u16 *s, int field_width,
 277                 int precision, int flags)
 278 {
 279         u16 *str = s ? s : L"<NULL>";
 280         int utf16_len = utf16_strnlen(str, precision);
 281         u8 utf8[utf16_len * MAX_UTF8_PER_UTF16];
 282         int utf8_len, i;
 283
 284         utf8_len = utf16_to_utf8(utf8, str, utf16_len) - utf8;
 285
 286         if (!(flags & LEFT))
 287                 while (utf8_len < field_width--)
 288                         ADDCH(buf, ' ');
 289         for (i = 0; i < utf8_len; ++i)
 290                 ADDCH(buf, utf8[i]);
 291         while (utf8_len < field_width--)
 292                 ADDCH(buf, ' ');
 293         return buf;
 294 }
 295
 296 #if defined(CONFIG_EFI_LOADER) && \
 297         !defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
 298 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 299                                 int precision, int flags)
 300 {
 301         u16 *str;
 302
 303         if (!dp)
 304                 return "<NULL>";
 305
 306         str = efi_dp_str((struct efi_device_path *)dp);
 307         if (!str)
 308                 return ERR_PTR(-ENOMEM);
 309
 310         buf = string16(buf, end, str, field_width, precision, flags);
 311         efi_free_pool(str);
 312         return buf;
 313 }
 314 #endif
 315
 316 #ifdef CONFIG_CMD_NET
 317 static const char hex_asc[] = "0123456789abcdef";
 318 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
 319 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
 320
 321 static inline char *pack_hex_byte(char *buf, u8 byte)
 322 {
 323         *buf++ = hex_asc_hi(byte);
 324         *buf++ = hex_asc_lo(byte);
 325         return buf;
 326 }
 327
 328 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 329                                 int precision, int flags)
 330 {
 331         /* (6 * 2 hex digits), 5 colons and trailing zero */
 332         char mac_addr[6 * 3];
 333         char *p = mac_addr;
 334         int i;
 335
 336         for (i = 0; i < 6; i++) {
 337                 p = pack_hex_byte(p, addr[i]);
 338                 if (!(flags & SPECIAL) && i != 5)
 339                         *p++ = ':';
 340         }
 341         *p = '\0';
 342
 343         return string(buf, end, mac_addr, field_width, precision,
 344                       flags & ~SPECIAL);
 345 }
 346
 347 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 348                          int precision, int flags)
 349 {
 350         /* (8 * 4 hex digits), 7 colons and trailing zero */
 351         char ip6_addr[8 * 5];
 352         char *p = ip6_addr;
 353         int i;
 354
 355         for (i = 0; i < 8; i++) {
 356                 p = pack_hex_byte(p, addr[2 * i]);
 357                 p = pack_hex_byte(p, addr[2 * i + 1]);
 358                 if (!(flags & SPECIAL) && i != 7)
 359                         *p++ = ':';
 360         }
 361         *p = '\0';
 362
 363         return string(buf, end, ip6_addr, field_width, precision,
 364                       flags & ~SPECIAL);
 365 }
 366
 367 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 368                          int precision, int flags)
 369 {
 370         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 371         char ip4_addr[4 * 4];
 372         char temp[3];   /* hold each IP quad in reverse order */
 373         char *p = ip4_addr;
 374         int i, digits;
 375
 376         for (i = 0; i < 4; i++) {
 377                 digits = put_dec_trunc(temp, addr[i]) - temp;
 378                 /* reverse the digits in the quad */
 379                 while (digits--)
 380                         *p++ = temp[digits];
 381                 if (i != 3)
 382                         *p++ = '.';
 383         }
 384         *p = '\0';
 385
 386         return string(buf, end, ip4_addr, field_width, precision,
 387                       flags & ~SPECIAL);
 388 }
 389 #endif
 390
 391 #ifdef CONFIG_LIB_UUID
 392 /*
 393  * This works (roughly) the same way as linux's, but we currently always
 394  * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
 395  * mostly just because that is what uuid_bin_to_str() supports.
 396  *
 397  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 398  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 399  */
 400 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 401                          int precision, int flags, const char *fmt)
 402 {
 403         char uuid[UUID_STR_LEN + 1];
 404         int str_format = UUID_STR_FORMAT_STD;
 405
 406         switch (*(++fmt)) {
 407         case 'L':
 408         case 'l':
 409                 str_format = UUID_STR_FORMAT_GUID;
 410                 break;
 411         case 'B':
 412         case 'b':
 413                 /* this is the default */
 414                 break;
 415         default:
 416                 break;
 417         }
 418
 419         uuid_bin_to_str(addr, uuid, str_format);
 420
 421         return string(buf, end, uuid, field_width, precision, flags);
 422 }
 423 #endif
 424
 425 /*
 426  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 427  * by an extra set of alphanumeric characters that are extended format
 428  * specifiers.
 429  *
 430  * Right now we handle:
 431  *
 432  * - 'M' For a 6-byte MAC address, it prints the address in the
 433  *       usual colon-separated hex notation
 434  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 435  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 436  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 437  *       currently the same
 438  *
 439  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 440  * function pointers are really function descriptors, which contain a
 441  * pointer to the real address.
 442  */
 443 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 444                 int field_width, int precision, int flags)
 445 {
 446         u64 num = (uintptr_t)ptr;
 447
 448         /*
 449          * Being a boot loader, we explicitly allow pointers to
 450          * (physical) address null.
 451          */
 452 #if 0
 453         if (!ptr)
 454                 return string(buf, end, "(null)", field_width, precision,
 455                               flags);
 456 #endif
 457
 458         switch (*fmt) {
 459 #if defined(CONFIG_EFI_LOADER) && \
 460         !defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
 461         case 'D':
 462                 return device_path_string(buf, end, ptr, field_width,
 463                                           precision, flags);
 464 #endif
 465 #ifdef CONFIG_CMD_NET
 466         case 'a':
 467                 flags |= SPECIAL | ZEROPAD;
 468
 469                 switch (fmt[1]) {
 470                 case 'p':
 471                 default:
 472                         field_width = sizeof(phys_addr_t) * 2 + 2;
 473                         num = *(phys_addr_t *)ptr;
 474                         break;
 475                 }
 476                 break;
 477         case 'm':
 478                 flags |= SPECIAL;
 479                 /* Fallthrough */
 480         case 'M':
 481                 return mac_address_string(buf, end, ptr, field_width,
 482                                           precision, flags);
 483         case 'i':
 484                 flags |= SPECIAL;
 485                 /* Fallthrough */
 486         case 'I':
 487                 if (fmt[1] == '6')
 488                         return ip6_addr_string(buf, end, ptr, field_width,
 489                                                precision, flags);
 490                 if (fmt[1] == '4')
 491                         return ip4_addr_string(buf, end, ptr, field_width,
 492                                                precision, flags);
 493                 flags &= ~SPECIAL;
 494                 break;
 495 #endif
 496 #ifdef CONFIG_LIB_UUID
 497         case 'U':
 498                 return uuid_string(buf, end, ptr, field_width, precision,
 499                                    flags, fmt);
 500 #endif
 501         default:
 502                 break;
 503         }
 504         flags |= SMALL;
 505         if (field_width == -1) {
 506                 field_width = 2*sizeof(void *);
 507                 flags |= ZEROPAD;
 508         }
 509         return number(buf, end, num, 16, field_width, precision, flags);
 510 }
 511
 512 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 513                               va_list args)
 514 {
 515         u64 num;
 516         int base;
 517         char *str;
 518
 519         int flags;              /* flags to number() */
 520
 521         int field_width;        /* width of output field */
 522         int precision;          /* min. # of digits for integers; max
 523                                    number of chars for from string */
 524         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 525                                 /* 'z' support added 23/7/1999 S.H.    */
 526                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 527                                 /* 't' added for ptrdiff_t */
 528         char *end = buf + size;
 529
 530         /* Make sure end is always >= buf - do we want this in U-Boot? */
 531         if (end < buf) {
 532                 end = ((void *)-1);
 533                 size = end - buf;
 534         }
 535         str = buf;
 536
 537         for (; *fmt ; ++fmt) {
 538                 if (*fmt != '%') {
 539                         ADDCH(str, *fmt);
 540                         continue;
 541                 }
 542
 543                 /* process flags */
 544                 flags = 0;
 545 repeat:
 546                         ++fmt;          /* this also skips first '%' */
 547                         switch (*fmt) {
 548                         case '-':
 549                                 flags |= LEFT;
 550                                 goto repeat;
 551                         case '+':
 552                                 flags |= PLUS;
 553                                 goto repeat;
 554                         case ' ':
 555                                 flags |= SPACE;
 556                                 goto repeat;
 557                         case '#':
 558                                 flags |= SPECIAL;
 559                                 goto repeat;
 560                         case '0':
 561                                 flags |= ZEROPAD;
 562                                 goto repeat;
 563                         }
 564
 565                 /* get field width */
 566                 field_width = -1;
 567                 if (is_digit(*fmt))
 568                         field_width = skip_atoi(&fmt);
 569                 else if (*fmt == '*') {
 570                         ++fmt;
 571                         /* it's the next argument */
 572                         field_width = va_arg(args, int);
 573                         if (field_width < 0) {
 574                                 field_width = -field_width;
 575                                 flags |= LEFT;
 576                         }
 577                 }
 578
 579                 /* get the precision */
 580                 precision = -1;
 581                 if (*fmt == '.') {
 582                         ++fmt;
 583                         if (is_digit(*fmt))
 584                                 precision = skip_atoi(&fmt);
 585                         else if (*fmt == '*') {
 586                                 ++fmt;
 587                                 /* it's the next argument */
 588                                 precision = va_arg(args, int);
 589                         }
 590                         if (precision < 0)
 591                                 precision = 0;
 592                 }
 593
 594                 /* get the conversion qualifier */
 595                 qualifier = -1;
 596                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 597                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 598                         qualifier = *fmt;
 599                         ++fmt;
 600                         if (qualifier == 'l' && *fmt == 'l') {
 601                                 qualifier = 'L';
 602                                 ++fmt;
 603                         }
 604                 }
 605
 606                 /* default base */
 607                 base = 10;
 608
 609                 switch (*fmt) {
 610                 case 'c':
 611                         if (!(flags & LEFT)) {
 612                                 while (--field_width > 0)
 613                                         ADDCH(str, ' ');
 614                         }
 615                         ADDCH(str, (unsigned char) va_arg(args, int));
 616                         while (--field_width > 0)
 617                                 ADDCH(str, ' ');
 618                         continue;
 619
 620                 case 's':
 621                         if (qualifier == 'l' && !IS_ENABLED(CONFIG_SPL_BUILD)) {
 622                                 str = string16(str, end, va_arg(args, u16 *),
 623                                                field_width, precision, flags);
 624                         } else {
 625                                 str = string(str, end, va_arg(args, char *),
 626                                              field_width, precision, flags);
 627                         }
 628                         continue;
 629
 630                 case 'p':
 631                         str = pointer(fmt + 1, str, end,
 632                                         va_arg(args, void *),
 633                                         field_width, precision, flags);
 634                         if (IS_ERR(str))
 635                                 return PTR_ERR(str);
 636                         /* Skip all alphanumeric pointer suffixes */
 637                         while (isalnum(fmt[1]))
 638                                 fmt++;
 639                         continue;
 640
 641                 case 'n':
 642                         if (qualifier == 'l') {
 643                                 long *ip = va_arg(args, long *);
 644                                 *ip = (str - buf);
 645                         } else {
 646                                 int *ip = va_arg(args, int *);
 647                                 *ip = (str - buf);
 648                         }
 649                         continue;
 650
 651                 case '%':
 652                         ADDCH(str, '%');
 653                         continue;
 654
 655                 /* integer number formats - set up the flags and "break" */
 656                 case 'o':
 657                         base = 8;
 658                         break;
 659
 660                 case 'x':
 661                         flags |= SMALL;
 662                 case 'X':
 663                         base = 16;
 664                         break;
 665
 666                 case 'd':
 667                 case 'i':
 668                         flags |= SIGN;
 669                 case 'u':
 670                         break;
 671
 672                 default:
 673                         ADDCH(str, '%');
 674                         if (*fmt)
 675                                 ADDCH(str, *fmt);
 676                         else
 677                                 --fmt;
 678                         continue;
 679                 }
 680                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 681                         num = va_arg(args, unsigned long long);
 682                 else if (qualifier == 'l') {
 683                         num = va_arg(args, unsigned long);
 684                         if (flags & SIGN)
 685                                 num = (signed long) num;
 686                 } else if (qualifier == 'Z' || qualifier == 'z') {
 687                         num = va_arg(args, size_t);
 688                 } else if (qualifier == 't') {
 689                         num = va_arg(args, ptrdiff_t);
 690                 } else if (qualifier == 'h') {
 691                         num = (unsigned short) va_arg(args, int);
 692                         if (flags & SIGN)
 693                                 num = (signed short) num;
 694                 } else {
 695                         num = va_arg(args, unsigned int);
 696                         if (flags & SIGN)
 697                                 num = (signed int) num;
 698                 }
 699                 str = number(str, end, num, base, field_width, precision,
 700                              flags);
 701         }
 702
 703         if (size > 0) {
 704                 ADDCH(str, '\0');
 705                 if (str > end)
 706                         end[-1] = '\0';
 707                 --str;
 708         }
 709         /* the trailing null byte doesn't count towards the total */
 710         return str - buf;
 711 }
 712
 713 int vsnprintf(char *buf, size_t size, const char *fmt,
 714                               va_list args)
 715 {
 716         return vsnprintf_internal(buf, size, fmt, args);
 717 }
 718
 719 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 720 {
 721         int i;
 722
 723         i = vsnprintf(buf, size, fmt, args);
 724
 725         if (likely(i < size))
 726                 return i;
 727         if (size != 0)
 728                 return size - 1;
 729         return 0;
 730 }
 731
 732 int snprintf(char *buf, size_t size, const char *fmt, ...)
 733 {
 734         va_list args;
 735         int i;
 736
 737         va_start(args, fmt);
 738         i = vsnprintf(buf, size, fmt, args);
 739         va_end(args);
 740
 741         return i;
 742 }
 743
 744 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 745 {
 746         va_list args;
 747         int i;
 748
 749         va_start(args, fmt);
 750         i = vscnprintf(buf, size, fmt, args);
 751         va_end(args);
 752
 753         return i;
 754 }
 755
 756 /**
 757  * Format a string and place it in a buffer (va_list version)
 758  *
 759  * @param buf   The buffer to place the result into
 760  * @param fmt   The format string to use
 761  * @param args  Arguments for the format string
 762  *
 763  * The function returns the number of characters written
 764  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 765  * buffer overflows.
 766  *
 767  * If you're not already dealing with a va_list consider using sprintf().
 768  */
 769 int vsprintf(char *buf, const char *fmt, va_list args)
 770 {
 771         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 772 }
 773
 774 int sprintf(char *buf, const char *fmt, ...)
 775 {
 776         va_list args;
 777         int i;
 778
 779         va_start(args, fmt);
 780         i = vsprintf(buf, fmt, args);
 781         va_end(args);
 782         return i;
 783 }
 784
 785 int printf(const char *fmt, ...)
 786 {
 787         va_list args;
 788         uint i;
 789         char printbuffer[CONFIG_SYS_PBSIZE];
 790
 791         va_start(args, fmt);
 792
 793         /*
 794          * For this to work, printbuffer must be larger than
 795          * anything we ever want to print.
 796          */
 797         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 798         va_end(args);
 799
 800         /* Handle error */
 801         if (i <= 0)
 802                 return i;
 803         /* Print the string */
 804         puts(printbuffer);
 805         return i;
 806 }
 807
 808 int vprintf(const char *fmt, va_list args)
 809 {
 810         uint i;
 811         char printbuffer[CONFIG_SYS_PBSIZE];
 812
 813         /*
 814          * For this to work, printbuffer must be larger than
 815          * anything we ever want to print.
 816          */
 817         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 818
 819         /* Handle error */
 820         if (i <= 0)
 821                 return i;
 822         /* Print the string */
 823         puts(printbuffer);
 824         return i;
 825 }
 826
 827
 828 void __assert_fail(const char *assertion, const char *file, unsigned line,
 829                    const char *function)
 830 {
 831         /* This will not return */
 832         panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
 833               assertion);
 834 }
 835
 836 char *simple_itoa(ulong i)
 837 {
 838         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 839         static char local[22];
 840         char *p = &local[21];
 841
 842         *p-- = '\0';
 843         do {
 844                 *p-- = '0' + i % 10;
 845                 i /= 10;
 846         } while (i > 0);
 847         return p + 1;
 848 }
 849
 850 /* We don't seem to have %'d in U-Boot */
 851 void print_grouped_ull(unsigned long long int_val, int digits)
 852 {
 853         char str[21], *s;
 854         int grab = 3;
 855
 856         digits = (digits + 2) / 3;
 857         sprintf(str, "%*llu", digits * 3, int_val);
 858         for (s = str; *s; s += grab) {
 859                 if (s != str)
 860                         putc(s[-1] != ' ' ? ',' : ' ');
 861                 printf("%.*s", grab, s);
 862                 grab = 3;
 863         }
 864 }
 865
 866 bool str2off(const char *p, loff_t *num)
 867 {
 868         char *endptr;
 869
 870         *num = simple_strtoull(p, &endptr, 16);
 871         return *p != '\0' && *endptr == '\0';
 872 }
 873
 874 bool str2long(const char *p, ulong *num)
 875 {
 876         char *endptr;
 877
 878         *num = simple_strtoul(p, &endptr, 16);
 879         return *p != '\0' && *endptr == '\0';
 880 }