lib/vsprintf.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  * (C) Copyright 2000-2009
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  */
   8
   9 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
  10 /*
  11  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  12  *
  13  * from hush: simple_itoa() was lifted from boa-0.93.15
  14  */
  15
  16 #include <common.h>
  17 #include <charset.h>
  18 #include <efi_loader.h>
  19 #include <div64.h>
  20 #include <hexdump.h>
  21 #include <stdarg.h>
  22 #include <uuid.h>
  23 #include <vsprintf.h>
  24 #include <linux/ctype.h>
  25 #include <linux/err.h>
  26 #include <linux/types.h>
  27 #include <linux/string.h>
  28
  29 #define noinline __attribute__((noinline))
  30
  31 /* we use this so that we can do without the ctype library */
  32 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  33
  34 static int skip_atoi(const char **s)
  35 {
  36         int i = 0;
  37
  38         while (is_digit(**s))
  39                 i = i * 10 + *((*s)++) - '0';
  40
  41         return i;
  42 }
  43
  44 /* Decimal conversion is by far the most typical, and is used
  45  * for /proc and /sys data. This directly impacts e.g. top performance
  46  * with many processes running. We optimize it for speed
  47  * using code from
  48  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  49  * (with permission from the author, Douglas W. Jones). */
  50
  51 /* Formats correctly any integer in [0,99999].
  52  * Outputs from one to five digits depending on input.
  53  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  54 static char *put_dec_trunc(char *buf, unsigned q)
  55 {
  56         unsigned d3, d2, d1, d0;
  57         d1 = (q>>4) & 0xf;
  58         d2 = (q>>8) & 0xf;
  59         d3 = (q>>12);
  60
  61         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  62         q = (d0 * 0xcd) >> 11;
  63         d0 = d0 - 10*q;
  64         *buf++ = d0 + '0'; /* least significant digit */
  65         d1 = q + 9*d3 + 5*d2 + d1;
  66         if (d1 != 0) {
  67                 q = (d1 * 0xcd) >> 11;
  68                 d1 = d1 - 10*q;
  69                 *buf++ = d1 + '0'; /* next digit */
  70
  71                 d2 = q + 2*d2;
  72                 if ((d2 != 0) || (d3 != 0)) {
  73                         q = (d2 * 0xd) >> 7;
  74                         d2 = d2 - 10*q;
  75                         *buf++ = d2 + '0'; /* next digit */
  76
  77                         d3 = q + 4*d3;
  78                         if (d3 != 0) {
  79                                 q = (d3 * 0xcd) >> 11;
  80                                 d3 = d3 - 10*q;
  81                                 *buf++ = d3 + '0';  /* next digit */
  82                                 if (q != 0)
  83                                         *buf++ = q + '0'; /* most sign. digit */
  84                         }
  85                 }
  86         }
  87         return buf;
  88 }
  89 /* Same with if's removed. Always emits five digits */
  90 static char *put_dec_full(char *buf, unsigned q)
  91 {
  92         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  93         /* but anyway, gcc produces better code with full-sized ints */
  94         unsigned d3, d2, d1, d0;
  95         d1 = (q>>4) & 0xf;
  96         d2 = (q>>8) & 0xf;
  97         d3 = (q>>12);
  98
  99         /*
 100          * Possible ways to approx. divide by 10
 101          * gcc -O2 replaces multiply with shifts and adds
 102          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 103          * (x * 0x67) >> 10:  1100111
 104          * (x * 0x34) >> 9:    110100 - same
 105          * (x * 0x1a) >> 8:     11010 - same
 106          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 107          */
 108
 109         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 110         q = (d0 * 0xcd) >> 11;
 111         d0 = d0 - 10*q;
 112         *buf++ = d0 + '0';
 113         d1 = q + 9*d3 + 5*d2 + d1;
 114                 q = (d1 * 0xcd) >> 11;
 115                 d1 = d1 - 10*q;
 116                 *buf++ = d1 + '0';
 117
 118                 d2 = q + 2*d2;
 119                         q = (d2 * 0xd) >> 7;
 120                         d2 = d2 - 10*q;
 121                         *buf++ = d2 + '0';
 122
 123                         d3 = q + 4*d3;
 124                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 125                                 /* q = (d3 * 0x67) >> 10; - would also work */
 126                                 d3 = d3 - 10*q;
 127                                 *buf++ = d3 + '0';
 128                                         *buf++ = q + '0';
 129         return buf;
 130 }
 131 /* No inlining helps gcc to use registers better */
 132 static noinline char *put_dec(char *buf, uint64_t num)
 133 {
 134         while (1) {
 135                 unsigned rem;
 136                 if (num < 100000)
 137                         return put_dec_trunc(buf, num);
 138                 rem = do_div(num, 100000);
 139                 buf = put_dec_full(buf, rem);
 140         }
 141 }
 142
 143 #define ZEROPAD 1               /* pad with zero */
 144 #define SIGN    2               /* unsigned/signed long */
 145 #define PLUS    4               /* show plus */
 146 #define SPACE   8               /* space if plus */
 147 #define LEFT    16              /* left justified */
 148 #define SMALL   32              /* Must be 32 == 0x20 */
 149 #define SPECIAL 64              /* 0x */
 150
 151 /*
 152  * Macro to add a new character to our output string, but only if it will
 153  * fit. The macro moves to the next character position in the output string.
 154  */
 155 #define ADDCH(str, ch) do { \
 156         if ((str) < end) \
 157                 *(str) = (ch); \
 158         ++str; \
 159         } while (0)
 160
 161 static char *number(char *buf, char *end, u64 num,
 162                 int base, int size, int precision, int type)
 163 {
 164         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 165         static const char digits[16] = "0123456789ABCDEF";
 166
 167         char tmp[66];
 168         char sign;
 169         char locase;
 170         int need_pfx = ((type & SPECIAL) && base != 10);
 171         int i;
 172
 173         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 174          * produces same digits or (maybe lowercased) letters */
 175         locase = (type & SMALL);
 176         if (type & LEFT)
 177                 type &= ~ZEROPAD;
 178         sign = 0;
 179         if (type & SIGN) {
 180                 if ((s64) num < 0) {
 181                         sign = '-';
 182                         num = -(s64) num;
 183                         size--;
 184                 } else if (type & PLUS) {
 185                         sign = '+';
 186                         size--;
 187                 } else if (type & SPACE) {
 188                         sign = ' ';
 189                         size--;
 190                 }
 191         }
 192         if (need_pfx) {
 193                 size--;
 194                 if (base == 16)
 195                         size--;
 196         }
 197
 198         /* generate full string in tmp[], in reverse order */
 199         i = 0;
 200         if (num == 0)
 201                 tmp[i++] = '0';
 202         /* Generic code, for any base:
 203         else do {
 204                 tmp[i++] = (digits[do_div(num,base)] | locase);
 205         } while (num != 0);
 206         */
 207         else if (base != 10) { /* 8 or 16 */
 208                 int mask = base - 1;
 209                 int shift = 3;
 210
 211                 if (base == 16)
 212                         shift = 4;
 213
 214                 do {
 215                         tmp[i++] = (digits[((unsigned char)num) & mask]
 216                                         | locase);
 217                         num >>= shift;
 218                 } while (num);
 219         } else { /* base 10 */
 220                 i = put_dec(tmp, num) - tmp;
 221         }
 222
 223         /* printing 100 using %2d gives "100", not "00" */
 224         if (i > precision)
 225                 precision = i;
 226         /* leading space padding */
 227         size -= precision;
 228         if (!(type & (ZEROPAD + LEFT))) {
 229                 while (--size >= 0)
 230                         ADDCH(buf, ' ');
 231         }
 232         /* sign */
 233         if (sign)
 234                 ADDCH(buf, sign);
 235         /* "0x" / "0" prefix */
 236         if (need_pfx) {
 237                 ADDCH(buf, '0');
 238                 if (base == 16)
 239                         ADDCH(buf, 'X' | locase);
 240         }
 241         /* zero or space padding */
 242         if (!(type & LEFT)) {
 243                 char c = (type & ZEROPAD) ? '0' : ' ';
 244
 245                 while (--size >= 0)
 246                         ADDCH(buf, c);
 247         }
 248         /* hmm even more zero padding? */
 249         while (i <= --precision)
 250                 ADDCH(buf, '0');
 251         /* actual digits of result */
 252         while (--i >= 0)
 253                 ADDCH(buf, tmp[i]);
 254         /* trailing space padding */
 255         while (--size >= 0)
 256                 ADDCH(buf, ' ');
 257         return buf;
 258 }
 259
 260 static char *string(char *buf, char *end, char *s, int field_width,
 261                 int precision, int flags)
 262 {
 263         int len, i;
 264
 265         if (s == NULL)
 266                 s = "<NULL>";
 267
 268         len = strnlen(s, precision);
 269
 270         if (!(flags & LEFT))
 271                 while (len < field_width--)
 272                         ADDCH(buf, ' ');
 273         for (i = 0; i < len; ++i)
 274                 ADDCH(buf, *s++);
 275         while (len < field_width--)
 276                 ADDCH(buf, ' ');
 277         return buf;
 278 }
 279
 280 /* U-Boot uses UTF-16 strings in the EFI context only. */
 281 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 282 static char *string16(char *buf, char *end, u16 *s, int field_width,
 283                 int precision, int flags)
 284 {
 285         const u16 *str = s ? s : L"<NULL>";
 286         ssize_t i, len = utf16_strnlen(str, precision);
 287
 288         if (!(flags & LEFT))
 289                 for (; len < field_width; --field_width)
 290                         ADDCH(buf, ' ');
 291         for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
 292                 s32 s = utf16_get(&str);
 293
 294                 if (s < 0)
 295                         s = '?';
 296                 utf8_put(s, &buf);
 297         }
 298         for (; len < field_width; --field_width)
 299                 ADDCH(buf, ' ');
 300         return buf;
 301 }
 302
 303 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
 304 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 305                                 int precision, int flags)
 306 {
 307         u16 *str;
 308
 309         /* If dp == NULL output the string '<NULL>' */
 310         if (!dp)
 311                 return string16(buf, end, dp, field_width, precision, flags);
 312
 313         str = efi_dp_str((struct efi_device_path *)dp);
 314         if (!str)
 315                 return ERR_PTR(-ENOMEM);
 316
 317         buf = string16(buf, end, str, field_width, precision, flags);
 318         efi_free_pool(str);
 319         return buf;
 320 }
 321 #endif
 322 #endif
 323
 324 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 325                                 int precision, int flags)
 326 {
 327         /* (6 * 2 hex digits), 5 colons and trailing zero */
 328         char mac_addr[6 * 3];
 329         char *p = mac_addr;
 330         int i;
 331
 332         for (i = 0; i < 6; i++) {
 333                 p = hex_byte_pack(p, addr[i]);
 334                 if (!(flags & SPECIAL) && i != 5)
 335                         *p++ = ':';
 336         }
 337         *p = '\0';
 338
 339         return string(buf, end, mac_addr, field_width, precision,
 340                       flags & ~SPECIAL);
 341 }
 342
 343 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 344                          int precision, int flags)
 345 {
 346         /* (8 * 4 hex digits), 7 colons and trailing zero */
 347         char ip6_addr[8 * 5];
 348         char *p = ip6_addr;
 349         int i;
 350
 351         for (i = 0; i < 8; i++) {
 352                 p = hex_byte_pack(p, addr[2 * i]);
 353                 p = hex_byte_pack(p, addr[2 * i + 1]);
 354                 if (!(flags & SPECIAL) && i != 7)
 355                         *p++ = ':';
 356         }
 357         *p = '\0';
 358
 359         return string(buf, end, ip6_addr, field_width, precision,
 360                       flags & ~SPECIAL);
 361 }
 362
 363 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 364                          int precision, int flags)
 365 {
 366         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 367         char ip4_addr[4 * 4];
 368         char temp[3];   /* hold each IP quad in reverse order */
 369         char *p = ip4_addr;
 370         int i, digits;
 371
 372         for (i = 0; i < 4; i++) {
 373                 digits = put_dec_trunc(temp, addr[i]) - temp;
 374                 /* reverse the digits in the quad */
 375                 while (digits--)
 376                         *p++ = temp[digits];
 377                 if (i != 3)
 378                         *p++ = '.';
 379         }
 380         *p = '\0';
 381
 382         return string(buf, end, ip4_addr, field_width, precision,
 383                       flags & ~SPECIAL);
 384 }
 385
 386 #ifdef CONFIG_LIB_UUID
 387 /*
 388  * This works (roughly) the same way as Linux's.
 389  *
 390  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 391  *   %pUB:   01020304-0506-0708-090A-0B0C0D0E0F10
 392  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 393  *   %pUL:   04030201-0605-0807-090A-0B0C0D0E0F10
 394  */
 395 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 396                          int precision, int flags, const char *fmt)
 397 {
 398         char uuid[UUID_STR_LEN + 1];
 399         int str_format;
 400
 401         switch (*(++fmt)) {
 402         case 'L':
 403                 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
 404                 break;
 405         case 'l':
 406                 str_format = UUID_STR_FORMAT_GUID;
 407                 break;
 408         case 'B':
 409                 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
 410                 break;
 411         default:
 412                 str_format = UUID_STR_FORMAT_STD;
 413                 break;
 414         }
 415
 416         if (addr)
 417                 uuid_bin_to_str(addr, uuid, str_format);
 418         else
 419                 strcpy(uuid, "<NULL>");
 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 /* Device paths only exist in the EFI context. */
 460 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
 461         case 'D':
 462                 return device_path_string(buf, end, ptr, field_width,
 463                                           precision, flags);
 464 #endif
 465         case 'a':
 466                 flags |= SPECIAL | ZEROPAD;
 467
 468                 switch (fmt[1]) {
 469                 case 'p':
 470                 default:
 471                         field_width = sizeof(phys_addr_t) * 2 + 2;
 472                         num = *(phys_addr_t *)ptr;
 473                         break;
 474                 }
 475                 break;
 476         case 'm':
 477                 flags |= SPECIAL;
 478                 /* Fallthrough */
 479         case 'M':
 480                 return mac_address_string(buf, end, ptr, field_width,
 481                                           precision, flags);
 482         case 'i':
 483                 flags |= SPECIAL;
 484                 /* Fallthrough */
 485         case 'I':
 486                 if (fmt[1] == '6')
 487                         return ip6_addr_string(buf, end, ptr, field_width,
 488                                                precision, flags);
 489                 if (fmt[1] == '4')
 490                         return ip4_addr_string(buf, end, ptr, field_width,
 491                                                precision, flags);
 492                 flags &= ~SPECIAL;
 493                 break;
 494 #ifdef CONFIG_LIB_UUID
 495         case 'U':
 496                 return uuid_string(buf, end, ptr, field_width, precision,
 497                                    flags, fmt);
 498 #endif
 499         default:
 500                 break;
 501         }
 502         flags |= SMALL;
 503         if (field_width == -1) {
 504                 field_width = 2*sizeof(void *);
 505                 flags |= ZEROPAD;
 506         }
 507         return number(buf, end, num, 16, field_width, precision, flags);
 508 }
 509
 510 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 511                               va_list args)
 512 {
 513         u64 num;
 514         int base;
 515         char *str;
 516
 517         int flags;              /* flags to number() */
 518
 519         int field_width;        /* width of output field */
 520         int precision;          /* min. # of digits for integers; max
 521                                    number of chars for from string */
 522         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 523                                 /* 'z' support added 23/7/1999 S.H.    */
 524                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 525                                 /* 't' added for ptrdiff_t */
 526         char *end = buf + size;
 527
 528         /* Make sure end is always >= buf - do we want this in U-Boot? */
 529         if (end < buf) {
 530                 end = ((void *)-1);
 531                 size = end - buf;
 532         }
 533         str = buf;
 534
 535         for (; *fmt ; ++fmt) {
 536                 if (*fmt != '%') {
 537                         ADDCH(str, *fmt);
 538                         continue;
 539                 }
 540
 541                 /* process flags */
 542                 flags = 0;
 543 repeat:
 544                         ++fmt;          /* this also skips first '%' */
 545                         switch (*fmt) {
 546                         case '-':
 547                                 flags |= LEFT;
 548                                 goto repeat;
 549                         case '+':
 550                                 flags |= PLUS;
 551                                 goto repeat;
 552                         case ' ':
 553                                 flags |= SPACE;
 554                                 goto repeat;
 555                         case '#':
 556                                 flags |= SPECIAL;
 557                                 goto repeat;
 558                         case '0':
 559                                 flags |= ZEROPAD;
 560                                 goto repeat;
 561                         }
 562
 563                 /* get field width */
 564                 field_width = -1;
 565                 if (is_digit(*fmt))
 566                         field_width = skip_atoi(&fmt);
 567                 else if (*fmt == '*') {
 568                         ++fmt;
 569                         /* it's the next argument */
 570                         field_width = va_arg(args, int);
 571                         if (field_width < 0) {
 572                                 field_width = -field_width;
 573                                 flags |= LEFT;
 574                         }
 575                 }
 576
 577                 /* get the precision */
 578                 precision = -1;
 579                 if (*fmt == '.') {
 580                         ++fmt;
 581                         if (is_digit(*fmt))
 582                                 precision = skip_atoi(&fmt);
 583                         else if (*fmt == '*') {
 584                                 ++fmt;
 585                                 /* it's the next argument */
 586                                 precision = va_arg(args, int);
 587                         }
 588                         if (precision < 0)
 589                                 precision = 0;
 590                 }
 591
 592                 /* get the conversion qualifier */
 593                 qualifier = -1;
 594                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 595                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 596                         qualifier = *fmt;
 597                         ++fmt;
 598                         if (qualifier == 'l' && *fmt == 'l') {
 599                                 qualifier = 'L';
 600                                 ++fmt;
 601                         }
 602                 }
 603
 604                 /* default base */
 605                 base = 10;
 606
 607                 switch (*fmt) {
 608                 case 'c':
 609                         if (!(flags & LEFT)) {
 610                                 while (--field_width > 0)
 611                                         ADDCH(str, ' ');
 612                         }
 613                         ADDCH(str, (unsigned char) va_arg(args, int));
 614                         while (--field_width > 0)
 615                                 ADDCH(str, ' ');
 616                         continue;
 617
 618                 case 's':
 619 /* U-Boot uses UTF-16 strings in the EFI context only. */
 620 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 621                         if (qualifier == 'l') {
 622                                 str = string16(str, end, va_arg(args, u16 *),
 623                                                field_width, precision, flags);
 624                         } else
 625 #endif
 626                         {
 627                                 str = string(str, end, va_arg(args, char *),
 628                                              field_width, precision, flags);
 629                         }
 630                         continue;
 631
 632                 case 'p':
 633                         str = pointer(fmt + 1, str, end,
 634                                         va_arg(args, void *),
 635                                         field_width, precision, flags);
 636                         if (IS_ERR(str))
 637                                 return PTR_ERR(str);
 638                         /* Skip all alphanumeric pointer suffixes */
 639                         while (isalnum(fmt[1]))
 640                                 fmt++;
 641                         continue;
 642
 643                 case 'n':
 644                         if (qualifier == 'l') {
 645                                 long *ip = va_arg(args, long *);
 646                                 *ip = (str - buf);
 647                         } else {
 648                                 int *ip = va_arg(args, int *);
 649                                 *ip = (str - buf);
 650                         }
 651                         continue;
 652
 653                 case '%':
 654                         ADDCH(str, '%');
 655                         continue;
 656
 657                 /* integer number formats - set up the flags and "break" */
 658                 case 'o':
 659                         base = 8;
 660                         break;
 661
 662                 case 'x':
 663                         flags |= SMALL;
 664                 case 'X':
 665                         base = 16;
 666                         break;
 667
 668                 case 'd':
 669                 case 'i':
 670                         flags |= SIGN;
 671                 case 'u':
 672                         break;
 673
 674                 default:
 675                         ADDCH(str, '%');
 676                         if (*fmt)
 677                                 ADDCH(str, *fmt);
 678                         else
 679                                 --fmt;
 680                         continue;
 681                 }
 682                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 683                         num = va_arg(args, unsigned long long);
 684                 else if (qualifier == 'l') {
 685                         num = va_arg(args, unsigned long);
 686                         if (flags & SIGN)
 687                                 num = (signed long) num;
 688                 } else if (qualifier == 'Z' || qualifier == 'z') {
 689                         num = va_arg(args, size_t);
 690                 } else if (qualifier == 't') {
 691                         num = va_arg(args, ptrdiff_t);
 692                 } else if (qualifier == 'h') {
 693                         num = (unsigned short) va_arg(args, int);
 694                         if (flags & SIGN)
 695                                 num = (signed short) num;
 696                 } else {
 697                         num = va_arg(args, unsigned int);
 698                         if (flags & SIGN)
 699                                 num = (signed int) num;
 700                 }
 701                 str = number(str, end, num, base, field_width, precision,
 702                              flags);
 703         }
 704
 705         if (size > 0) {
 706                 ADDCH(str, '\0');
 707                 if (str > end)
 708                         end[-1] = '\0';
 709                 --str;
 710         }
 711         /* the trailing null byte doesn't count towards the total */
 712         return str - buf;
 713 }
 714
 715 int vsnprintf(char *buf, size_t size, const char *fmt,
 716                               va_list args)
 717 {
 718         return vsnprintf_internal(buf, size, fmt, args);
 719 }
 720
 721 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 722 {
 723         int i;
 724
 725         i = vsnprintf(buf, size, fmt, args);
 726
 727         if (likely(i < size))
 728                 return i;
 729         if (size != 0)
 730                 return size - 1;
 731         return 0;
 732 }
 733
 734 int snprintf(char *buf, size_t size, const char *fmt, ...)
 735 {
 736         va_list args;
 737         int i;
 738
 739         va_start(args, fmt);
 740         i = vsnprintf(buf, size, fmt, args);
 741         va_end(args);
 742
 743         return i;
 744 }
 745
 746 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 747 {
 748         va_list args;
 749         int i;
 750
 751         va_start(args, fmt);
 752         i = vscnprintf(buf, size, fmt, args);
 753         va_end(args);
 754
 755         return i;
 756 }
 757
 758 /**
 759  * Format a string and place it in a buffer (va_list version)
 760  *
 761  * @param buf   The buffer to place the result into
 762  * @param fmt   The format string to use
 763  * @param args  Arguments for the format string
 764  *
 765  * The function returns the number of characters written
 766  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 767  * buffer overflows.
 768  *
 769  * If you're not already dealing with a va_list consider using sprintf().
 770  */
 771 int vsprintf(char *buf, const char *fmt, va_list args)
 772 {
 773         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 774 }
 775
 776 int sprintf(char *buf, const char *fmt, ...)
 777 {
 778         va_list args;
 779         int i;
 780
 781         va_start(args, fmt);
 782         i = vsprintf(buf, fmt, args);
 783         va_end(args);
 784         return i;
 785 }
 786
 787 #if CONFIG_IS_ENABLED(PRINTF)
 788 int printf(const char *fmt, ...)
 789 {
 790         va_list args;
 791         uint i;
 792         char printbuffer[CONFIG_SYS_PBSIZE];
 793
 794         va_start(args, fmt);
 795
 796         /*
 797          * For this to work, printbuffer must be larger than
 798          * anything we ever want to print.
 799          */
 800         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 801         va_end(args);
 802
 803         /* Handle error */
 804         if (i <= 0)
 805                 return i;
 806         /* Print the string */
 807         puts(printbuffer);
 808         return i;
 809 }
 810
 811 int vprintf(const char *fmt, va_list args)
 812 {
 813         uint i;
 814         char printbuffer[CONFIG_SYS_PBSIZE];
 815
 816         /*
 817          * For this to work, printbuffer must be larger than
 818          * anything we ever want to print.
 819          */
 820         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 821
 822         /* Handle error */
 823         if (i <= 0)
 824                 return i;
 825         /* Print the string */
 826         puts(printbuffer);
 827         return i;
 828 }
 829 #endif
 830
 831 char *simple_itoa(ulong i)
 832 {
 833         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 834         static char local[22];
 835         char *p = &local[21];
 836
 837         *p-- = '\0';
 838         do {
 839                 *p-- = '0' + i % 10;
 840                 i /= 10;
 841         } while (i > 0);
 842         return p + 1;
 843 }
 844
 845 /* We don't seem to have %'d in U-Boot */
 846 void print_grouped_ull(unsigned long long int_val, int digits)
 847 {
 848         char str[21], *s;
 849         int grab = 3;
 850
 851         digits = (digits + 2) / 3;
 852         sprintf(str, "%*llu", digits * 3, int_val);
 853         for (s = str; *s; s += grab) {
 854                 if (s != str)
 855                         putc(s[-1] != ' ' ? ',' : ' ');
 856                 printf("%.*s", grab, s);
 857                 grab = 3;
 858         }
 859 }
 860
 861 bool str2off(const char *p, loff_t *num)
 862 {
 863         char *endptr;
 864
 865         *num = simple_strtoull(p, &endptr, 16);
 866         return *p != '\0' && *endptr == '\0';
 867 }
 868
 869 bool str2long(const char *p, ulong *num)
 870 {
 871         char *endptr;
 872
 873         *num = simple_strtoul(p, &endptr, 16);
 874         return *p != '\0' && *endptr == '\0';
 875 }
 876
 877 char *strmhz(char *buf, unsigned long hz)
 878 {
 879         long l, n;
 880         long m;
 881
 882         n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
 883         l = sprintf(buf, "%ld", n);
 884
 885         hz -= n * 1000000L;
 886         m = DIV_ROUND_CLOSEST(hz, 1000L);
 887         if (m != 0)
 888                 sprintf(buf + l, ".%03ld", m);
 889
 890         return buf;
 891 }