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