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 /* we use this so that we can do without the ctype library */
  30 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  31
  32 static int skip_atoi(const char **s)
  33 {
  34         int i = 0;
  35
  36         while (is_digit(**s))
  37                 i = i * 10 + *((*s)++) - '0';
  38
  39         return i;
  40 }
  41
  42 /* Decimal conversion is by far the most typical, and is used
  43  * for /proc and /sys data. This directly impacts e.g. top performance
  44  * with many processes running. We optimize it for speed
  45  * using code from
  46  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  47  * (with permission from the author, Douglas W. Jones). */
  48
  49 /* Formats correctly any integer in [0,99999].
  50  * Outputs from one to five digits depending on input.
  51  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  52 static char *put_dec_trunc(char *buf, unsigned q)
  53 {
  54         unsigned d3, d2, d1, d0;
  55         d1 = (q>>4) & 0xf;
  56         d2 = (q>>8) & 0xf;
  57         d3 = (q>>12);
  58
  59         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  60         q = (d0 * 0xcd) >> 11;
  61         d0 = d0 - 10*q;
  62         *buf++ = d0 + '0'; /* least significant digit */
  63         d1 = q + 9*d3 + 5*d2 + d1;
  64         if (d1 != 0) {
  65                 q = (d1 * 0xcd) >> 11;
  66                 d1 = d1 - 10*q;
  67                 *buf++ = d1 + '0'; /* next digit */
  68
  69                 d2 = q + 2*d2;
  70                 if ((d2 != 0) || (d3 != 0)) {
  71                         q = (d2 * 0xd) >> 7;
  72                         d2 = d2 - 10*q;
  73                         *buf++ = d2 + '0'; /* next digit */
  74
  75                         d3 = q + 4*d3;
  76                         if (d3 != 0) {
  77                                 q = (d3 * 0xcd) >> 11;
  78                                 d3 = d3 - 10*q;
  79                                 *buf++ = d3 + '0';  /* next digit */
  80                                 if (q != 0)
  81                                         *buf++ = q + '0'; /* most sign. digit */
  82                         }
  83                 }
  84         }
  85         return buf;
  86 }
  87 /* Same with if's removed. Always emits five digits */
  88 static char *put_dec_full(char *buf, unsigned q)
  89 {
  90         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  91         /* but anyway, gcc produces better code with full-sized ints */
  92         unsigned d3, d2, d1, d0;
  93         d1 = (q>>4) & 0xf;
  94         d2 = (q>>8) & 0xf;
  95         d3 = (q>>12);
  96
  97         /*
  98          * Possible ways to approx. divide by 10
  99          * gcc -O2 replaces multiply with shifts and adds
 100          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 101          * (x * 0x67) >> 10:  1100111
 102          * (x * 0x34) >> 9:    110100 - same
 103          * (x * 0x1a) >> 8:     11010 - same
 104          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 105          */
 106
 107         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 108         q = (d0 * 0xcd) >> 11;
 109         d0 = d0 - 10*q;
 110         *buf++ = d0 + '0';
 111         d1 = q + 9*d3 + 5*d2 + d1;
 112                 q = (d1 * 0xcd) >> 11;
 113                 d1 = d1 - 10*q;
 114                 *buf++ = d1 + '0';
 115
 116                 d2 = q + 2*d2;
 117                         q = (d2 * 0xd) >> 7;
 118                         d2 = d2 - 10*q;
 119                         *buf++ = d2 + '0';
 120
 121                         d3 = q + 4*d3;
 122                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 123                                 /* q = (d3 * 0x67) >> 10; - would also work */
 124                                 d3 = d3 - 10*q;
 125                                 *buf++ = d3 + '0';
 126                                         *buf++ = q + '0';
 127         return buf;
 128 }
 129 /* No inlining helps gcc to use registers better */
 130 static noinline char *put_dec(char *buf, uint64_t num)
 131 {
 132         while (1) {
 133                 unsigned rem;
 134                 if (num < 100000)
 135                         return put_dec_trunc(buf, num);
 136                 rem = do_div(num, 100000);
 137                 buf = put_dec_full(buf, rem);
 138         }
 139 }
 140
 141 #define ZEROPAD 1               /* pad with zero */
 142 #define SIGN    2               /* unsigned/signed long */
 143 #define PLUS    4               /* show plus */
 144 #define SPACE   8               /* space if plus */
 145 #define LEFT    16              /* left justified */
 146 #define SMALL   32              /* Must be 32 == 0x20 */
 147 #define SPECIAL 64              /* 0x */
 148
 149 /*
 150  * Macro to add a new character to our output string, but only if it will
 151  * fit. The macro moves to the next character position in the output string.
 152  */
 153 #define ADDCH(str, ch) do { \
 154         if ((str) < end) \
 155                 *(str) = (ch); \
 156         ++str; \
 157         } while (0)
 158
 159 static char *number(char *buf, char *end, u64 num,
 160                 int base, int size, int precision, int type)
 161 {
 162         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 163         static const char digits[16] = "0123456789ABCDEF";
 164
 165         char tmp[66];
 166         char sign;
 167         char locase;
 168         int need_pfx = ((type & SPECIAL) && base != 10);
 169         int i;
 170
 171         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 172          * produces same digits or (maybe lowercased) letters */
 173         locase = (type & SMALL);
 174         if (type & LEFT)
 175                 type &= ~ZEROPAD;
 176         sign = 0;
 177         if (type & SIGN) {
 178                 if ((s64) num < 0) {
 179                         sign = '-';
 180                         num = -(s64) num;
 181                         size--;
 182                 } else if (type & PLUS) {
 183                         sign = '+';
 184                         size--;
 185                 } else if (type & SPACE) {
 186                         sign = ' ';
 187                         size--;
 188                 }
 189         }
 190         if (need_pfx) {
 191                 size--;
 192                 if (base == 16)
 193                         size--;
 194         }
 195
 196         /* generate full string in tmp[], in reverse order */
 197         i = 0;
 198         if (num == 0)
 199                 tmp[i++] = '0';
 200         /* Generic code, for any base:
 201         else do {
 202                 tmp[i++] = (digits[do_div(num,base)] | locase);
 203         } while (num != 0);
 204         */
 205         else if (base != 10) { /* 8 or 16 */
 206                 int mask = base - 1;
 207                 int shift = 3;
 208
 209                 if (base == 16)
 210                         shift = 4;
 211
 212                 do {
 213                         tmp[i++] = (digits[((unsigned char)num) & mask]
 214                                         | locase);
 215                         num >>= shift;
 216                 } while (num);
 217         } else { /* base 10 */
 218                 i = put_dec(tmp, num) - tmp;
 219         }
 220
 221         /* printing 100 using %2d gives "100", not "00" */
 222         if (i > precision)
 223                 precision = i;
 224         /* leading space padding */
 225         size -= precision;
 226         if (!(type & (ZEROPAD + LEFT))) {
 227                 while (--size >= 0)
 228                         ADDCH(buf, ' ');
 229         }
 230         /* sign */
 231         if (sign)
 232                 ADDCH(buf, sign);
 233         /* "0x" / "0" prefix */
 234         if (need_pfx) {
 235                 ADDCH(buf, '0');
 236                 if (base == 16)
 237                         ADDCH(buf, 'X' | locase);
 238         }
 239         /* zero or space padding */
 240         if (!(type & LEFT)) {
 241                 char c = (type & ZEROPAD) ? '0' : ' ';
 242
 243                 while (--size >= 0)
 244                         ADDCH(buf, c);
 245         }
 246         /* hmm even more zero padding? */
 247         while (i <= --precision)
 248                 ADDCH(buf, '0');
 249         /* actual digits of result */
 250         while (--i >= 0)
 251                 ADDCH(buf, tmp[i]);
 252         /* trailing space padding */
 253         while (--size >= 0)
 254                 ADDCH(buf, ' ');
 255         return buf;
 256 }
 257
 258 static char *string(char *buf, char *end, const char *s, int field_width,
 259                 int precision, int flags)
 260 {
 261         int len, i;
 262
 263         if (s == NULL)
 264                 s = "<NULL>";
 265
 266         len = strnlen(s, precision);
 267
 268         if (!(flags & LEFT))
 269                 while (len < field_width--)
 270                         ADDCH(buf, ' ');
 271         for (i = 0; i < len; ++i)
 272                 ADDCH(buf, *s++);
 273         while (len < field_width--)
 274                 ADDCH(buf, ' ');
 275         return buf;
 276 }
 277
 278 /* U-Boot uses UTF-16 strings in the EFI context only. */
 279 static __maybe_unused char *string16(char *buf, char *end, u16 *s,
 280                                      int field_width, int precision, int flags)
 281 {
 282         const u16 *str = s ? s : u"<NULL>";
 283         ssize_t i, len = utf16_strnlen(str, precision);
 284
 285         if (!(flags & LEFT))
 286                 for (; len < field_width; --field_width)
 287                         ADDCH(buf, ' ');
 288         if (buf < end)
 289                 *buf = 0;
 290         for (i = 0; i < len; ++i) {
 291                 int slen = utf16_utf8_strnlen(str, 1);
 292                 s32 s = utf16_get(&str);
 293
 294                 if (s < 0)
 295                         s = '?';
 296                 if (buf + slen < end) {
 297                         utf8_put(s, &buf);
 298                         if (buf < end)
 299                                 *buf = 0;
 300                 } else {
 301                         buf += slen;
 302                 }
 303         }
 304         for (; len < field_width; --field_width)
 305                 ADDCH(buf, ' ');
 306
 307         return buf;
 308 }
 309
 310 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
 311 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 312                                 int precision, int flags)
 313 {
 314         u16 *str;
 315
 316         /* If dp == NULL output the string '<NULL>' */
 317         if (!dp)
 318                 return string16(buf, end, dp, field_width, precision, flags);
 319
 320         str = efi_dp_str((struct efi_device_path *)dp);
 321         if (!str)
 322                 return ERR_PTR(-ENOMEM);
 323
 324         buf = string16(buf, end, str, field_width, precision, flags);
 325         efi_free_pool(str);
 326         return buf;
 327 }
 328 #endif
 329
 330 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 331                                 int precision, int flags)
 332 {
 333         /* (6 * 2 hex digits), 5 colons and trailing zero */
 334         char mac_addr[6 * 3];
 335         char *p = mac_addr;
 336         int i;
 337
 338         for (i = 0; i < 6; i++) {
 339                 p = hex_byte_pack(p, addr[i]);
 340                 if (!(flags & SPECIAL) && i != 5)
 341                         *p++ = ':';
 342         }
 343         *p = '\0';
 344
 345         return string(buf, end, mac_addr, field_width, precision,
 346                       flags & ~SPECIAL);
 347 }
 348
 349 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 350                          int precision, int flags)
 351 {
 352         /* (8 * 4 hex digits), 7 colons and trailing zero */
 353         char ip6_addr[8 * 5];
 354         char *p = ip6_addr;
 355         int i;
 356
 357         for (i = 0; i < 8; i++) {
 358                 p = hex_byte_pack(p, addr[2 * i]);
 359                 p = hex_byte_pack(p, addr[2 * i + 1]);
 360                 if (!(flags & SPECIAL) && i != 7)
 361                         *p++ = ':';
 362         }
 363         *p = '\0';
 364
 365         return string(buf, end, ip6_addr, field_width, precision,
 366                       flags & ~SPECIAL);
 367 }
 368
 369 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 370                          int precision, int flags)
 371 {
 372         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 373         char ip4_addr[4 * 4];
 374         char temp[3];   /* hold each IP quad in reverse order */
 375         char *p = ip4_addr;
 376         int i, digits;
 377
 378         for (i = 0; i < 4; i++) {
 379                 digits = put_dec_trunc(temp, addr[i]) - temp;
 380                 /* reverse the digits in the quad */
 381                 while (digits--)
 382                         *p++ = temp[digits];
 383                 if (i != 3)
 384                         *p++ = '.';
 385         }
 386         *p = '\0';
 387
 388         return string(buf, end, ip4_addr, field_width, precision,
 389                       flags & ~SPECIAL);
 390 }
 391
 392 #ifdef CONFIG_LIB_UUID
 393 /*
 394  * This works (roughly) the same way as Linux's.
 395  *
 396  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 397  *   %pUB:   01020304-0506-0708-090A-0B0C0D0E0F10
 398  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 399  *   %pUL:   04030201-0605-0807-090A-0B0C0D0E0F10
 400  *   %pUs:   GUID text representation if known or fallback to %pUl
 401  */
 402 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 403                          int precision, int flags, const char *fmt)
 404 {
 405         char uuid[UUID_STR_LEN + 1];
 406         int str_format;
 407         const char *str;
 408
 409         switch (*(++fmt)) {
 410         case 'L':
 411                 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
 412                 break;
 413         case 'l':
 414                 str_format = UUID_STR_FORMAT_GUID;
 415                 break;
 416         case 'B':
 417                 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
 418                 break;
 419         case 's':
 420                 str = uuid_guid_get_str(addr);
 421                 if (str)
 422                         return string(buf, end, str,
 423                                       field_width, precision, flags);
 424                 str_format = UUID_STR_FORMAT_GUID;
 425                 break;
 426         default:
 427                 str_format = UUID_STR_FORMAT_STD;
 428                 break;
 429         }
 430
 431         if (addr)
 432                 uuid_bin_to_str(addr, uuid, str_format);
 433         else
 434                 strcpy(uuid, "<NULL>");
 435
 436         return string(buf, end, uuid, field_width, precision, flags);
 437 }
 438 #endif
 439
 440 /*
 441  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 442  * by an extra set of alphanumeric characters that are extended format
 443  * specifiers.
 444  *
 445  * Right now we handle:
 446  *
 447  * - 'M' For a 6-byte MAC address, it prints the address in the
 448  *       usual colon-separated hex notation
 449  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 450  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 451  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 452  *       currently the same
 453  */
 454 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 455                 int field_width, int precision, int flags)
 456 {
 457         u64 num = (uintptr_t)ptr;
 458
 459         /*
 460          * Being a boot loader, we explicitly allow pointers to
 461          * (physical) address null.
 462          */
 463 #if 0
 464         if (!ptr)
 465                 return string(buf, end, "(null)", field_width, precision,
 466                               flags);
 467 #endif
 468
 469         switch (*fmt) {
 470 /* Device paths only exist in the EFI context. */
 471 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
 472         case 'D':
 473                 return device_path_string(buf, end, ptr, field_width,
 474                                           precision, flags);
 475 #endif
 476         case 'a':
 477                 flags |= SPECIAL | ZEROPAD;
 478
 479                 switch (fmt[1]) {
 480                 case 'p':
 481                 default:
 482                         field_width = sizeof(phys_addr_t) * 2 + 2;
 483                         num = *(phys_addr_t *)ptr;
 484                         break;
 485                 }
 486                 break;
 487         case 'm':
 488                 flags |= SPECIAL;
 489                 /* Fallthrough */
 490         case 'M':
 491                 return mac_address_string(buf, end, ptr, field_width,
 492                                           precision, flags);
 493         case 'i':
 494                 flags |= SPECIAL;
 495                 /* Fallthrough */
 496         case 'I':
 497                 if (IS_ENABLED(CONFIG_IPV6) && fmt[1] == '6')
 498                         return ip6_addr_string(buf, end, ptr, field_width,
 499                                                precision, flags);
 500                 if (fmt[1] == '4')
 501                         return ip4_addr_string(buf, end, ptr, field_width,
 502                                                precision, flags);
 503                 flags &= ~SPECIAL;
 504                 break;
 505 #ifdef CONFIG_LIB_UUID
 506         case 'U':
 507                 return uuid_string(buf, end, ptr, field_width, precision,
 508                                    flags, fmt);
 509 #endif
 510         default:
 511                 break;
 512         }
 513         flags |= SMALL;
 514         if (field_width == -1) {
 515                 field_width = 2*sizeof(void *);
 516                 flags |= ZEROPAD;
 517         }
 518         return number(buf, end, num, 16, field_width, precision, flags);
 519 }
 520
 521 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 522                               va_list args)
 523 {
 524         u64 num;
 525         int base;
 526         char *str;
 527
 528         int flags;              /* flags to number() */
 529
 530         int field_width;        /* width of output field */
 531         int precision;          /* min. # of digits for integers; max
 532                                    number of chars for from string */
 533         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 534                                 /* 'z' support added 23/7/1999 S.H.    */
 535                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 536                                 /* 't' added for ptrdiff_t */
 537         char *end = buf + size;
 538
 539         /* Make sure end is always >= buf - do we want this in U-Boot? */
 540         if (end < buf) {
 541                 end = ((void *)-1);
 542                 size = end - buf;
 543         }
 544         str = buf;
 545
 546         for (; *fmt ; ++fmt) {
 547                 if (*fmt != '%') {
 548                         ADDCH(str, *fmt);
 549                         continue;
 550                 }
 551
 552                 /* process flags */
 553                 flags = 0;
 554 repeat:
 555                         ++fmt;          /* this also skips first '%' */
 556                         switch (*fmt) {
 557                         case '-':
 558                                 flags |= LEFT;
 559                                 goto repeat;
 560                         case '+':
 561                                 flags |= PLUS;
 562                                 goto repeat;
 563                         case ' ':
 564                                 flags |= SPACE;
 565                                 goto repeat;
 566                         case '#':
 567                                 flags |= SPECIAL;
 568                                 goto repeat;
 569                         case '0':
 570                                 flags |= ZEROPAD;
 571                                 goto repeat;
 572                         }
 573
 574                 /* get field width */
 575                 field_width = -1;
 576                 if (is_digit(*fmt))
 577                         field_width = skip_atoi(&fmt);
 578                 else if (*fmt == '*') {
 579                         ++fmt;
 580                         /* it's the next argument */
 581                         field_width = va_arg(args, int);
 582                         if (field_width < 0) {
 583                                 field_width = -field_width;
 584                                 flags |= LEFT;
 585                         }
 586                 }
 587
 588                 /* get the precision */
 589                 precision = -1;
 590                 if (*fmt == '.') {
 591                         ++fmt;
 592                         if (is_digit(*fmt))
 593                                 precision = skip_atoi(&fmt);
 594                         else if (*fmt == '*') {
 595                                 ++fmt;
 596                                 /* it's the next argument */
 597                                 precision = va_arg(args, int);
 598                         }
 599                         if (precision < 0)
 600                                 precision = 0;
 601                 }
 602
 603                 /* get the conversion qualifier */
 604                 qualifier = -1;
 605                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 606                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 607                         qualifier = *fmt;
 608                         ++fmt;
 609                         if (qualifier == 'l' && *fmt == 'l') {
 610                                 qualifier = 'L';
 611                                 ++fmt;
 612                         }
 613                 }
 614
 615                 /* default base */
 616                 base = 10;
 617
 618                 switch (*fmt) {
 619                 case 'c':
 620                         if (!(flags & LEFT)) {
 621                                 while (--field_width > 0)
 622                                         ADDCH(str, ' ');
 623                         }
 624                         ADDCH(str, (unsigned char) va_arg(args, int));
 625                         while (--field_width > 0)
 626                                 ADDCH(str, ' ');
 627                         continue;
 628
 629                 case 's':
 630 /* U-Boot uses UTF-16 strings in the EFI context only. */
 631 #if (CONFIG_IS_ENABLED(EFI_LOADER) || CONFIG_IS_ENABLED(EFI_APP)) && \
 632         !defined(API_BUILD)
 633                         if (qualifier == 'l') {
 634                                 str = string16(str, end, va_arg(args, u16 *),
 635                                                field_width, precision, flags);
 636                         } else
 637 #endif
 638                         {
 639                                 str = string(str, end, va_arg(args, char *),
 640                                              field_width, precision, flags);
 641                         }
 642                         continue;
 643
 644                 case 'p':
 645                         str = pointer(fmt + 1, str, end,
 646                                         va_arg(args, void *),
 647                                         field_width, precision, flags);
 648                         if (IS_ERR(str))
 649                                 return PTR_ERR(str);
 650                         /* Skip all alphanumeric pointer suffixes */
 651                         while (isalnum(fmt[1]))
 652                                 fmt++;
 653                         continue;
 654
 655                 case 'n':
 656                         if (qualifier == 'l') {
 657                                 long *ip = va_arg(args, long *);
 658                                 *ip = (str - buf);
 659                         } else {
 660                                 int *ip = va_arg(args, int *);
 661                                 *ip = (str - buf);
 662                         }
 663                         continue;
 664
 665                 case '%':
 666                         ADDCH(str, '%');
 667                         continue;
 668
 669                 /* integer number formats - set up the flags and "break" */
 670                 case 'o':
 671                         base = 8;
 672                         break;
 673
 674                 case 'x':
 675                         flags |= SMALL;
 676                 case 'X':
 677                         base = 16;
 678                         break;
 679
 680                 case 'd':
 681                 case 'i':
 682                         flags |= SIGN;
 683                 case 'u':
 684                         break;
 685
 686                 default:
 687                         ADDCH(str, '%');
 688                         if (*fmt)
 689                                 ADDCH(str, *fmt);
 690                         else
 691                                 --fmt;
 692                         continue;
 693                 }
 694                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 695                         num = va_arg(args, unsigned long long);
 696                 else if (qualifier == 'l') {
 697                         num = va_arg(args, unsigned long);
 698                         if (flags & SIGN)
 699                                 num = (signed long) num;
 700                 } else if (qualifier == 'Z' || qualifier == 'z') {
 701                         num = va_arg(args, size_t);
 702                 } else if (qualifier == 't') {
 703                         num = va_arg(args, ptrdiff_t);
 704                 } else if (qualifier == 'h') {
 705                         num = (unsigned short) va_arg(args, int);
 706                         if (flags & SIGN)
 707                                 num = (signed short) num;
 708                 } else {
 709                         num = va_arg(args, unsigned int);
 710                         if (flags & SIGN)
 711                                 num = (signed int) num;
 712                 }
 713                 str = number(str, end, num, base, field_width, precision,
 714                              flags);
 715         }
 716
 717         if (size > 0) {
 718                 ADDCH(str, '\0');
 719                 if (str > end)
 720                         end[-1] = '\0';
 721                 --str;
 722         }
 723         /* the trailing null byte doesn't count towards the total */
 724         return str - buf;
 725 }
 726
 727 int vsnprintf(char *buf, size_t size, const char *fmt,
 728                               va_list args)
 729 {
 730         return vsnprintf_internal(buf, size, fmt, args);
 731 }
 732
 733 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 734 {
 735         int i;
 736
 737         i = vsnprintf(buf, size, fmt, args);
 738
 739         if (likely(i < size))
 740                 return i;
 741         if (size != 0)
 742                 return size - 1;
 743         return 0;
 744 }
 745
 746 int snprintf(char *buf, size_t size, const char *fmt, ...)
 747 {
 748         va_list args;
 749         int i;
 750
 751         va_start(args, fmt);
 752         i = vsnprintf(buf, size, fmt, args);
 753         va_end(args);
 754
 755         return i;
 756 }
 757
 758 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 759 {
 760         va_list args;
 761         int i;
 762
 763         va_start(args, fmt);
 764         i = vscnprintf(buf, size, fmt, args);
 765         va_end(args);
 766
 767         return i;
 768 }
 769
 770 /**
 771  * Format a string and place it in a buffer (va_list version)
 772  *
 773  * @param buf   The buffer to place the result into
 774  * @param fmt   The format string to use
 775  * @param args  Arguments for the format string
 776  *
 777  * The function returns the number of characters written
 778  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 779  * buffer overflows.
 780  *
 781  * If you're not already dealing with a va_list consider using sprintf().
 782  */
 783 int vsprintf(char *buf, const char *fmt, va_list args)
 784 {
 785         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 786 }
 787
 788 int sprintf(char *buf, const char *fmt, ...)
 789 {
 790         va_list args;
 791         int i;
 792
 793         va_start(args, fmt);
 794         i = vsprintf(buf, fmt, args);
 795         va_end(args);
 796         return i;
 797 }
 798
 799 #if CONFIG_IS_ENABLED(PRINTF)
 800 int printf(const char *fmt, ...)
 801 {
 802         va_list args;
 803         uint i;
 804
 805         va_start(args, fmt);
 806         i = vprintf(fmt, args);
 807         va_end(args);
 808
 809         return i;
 810 }
 811
 812 int vprintf(const char *fmt, va_list args)
 813 {
 814         uint i;
 815         char printbuffer[CONFIG_SYS_PBSIZE];
 816
 817         /*
 818          * For this to work, printbuffer must be larger than
 819          * anything we ever want to print.
 820          */
 821         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 822
 823         /* Handle error */
 824         if (i <= 0)
 825                 return i;
 826         /* Print the string */
 827         puts(printbuffer);
 828         return i;
 829 }
 830 #endif
 831
 832 static char local_toa[22];
 833
 834 char *simple_itoa(ulong i)
 835 {
 836         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 837         char *p = &local_toa[21];
 838
 839         *p-- = '\0';
 840         do {
 841                 *p-- = '0' + i % 10;
 842                 i /= 10;
 843         } while (i > 0);
 844         return p + 1;
 845 }
 846
 847 char *simple_xtoa(ulong num)
 848 {
 849         /* 16 digits plus nul terminator, good for 64-bit or smaller ints */
 850         char *p = &local_toa[17];
 851
 852         *--p = '\0';
 853         do {
 854                 p -= 2;
 855                 hex_byte_pack(p, num & 0xff);
 856                 num >>= 8;
 857         } while (num > 0);
 858
 859         return p;
 860 }
 861
 862 /* We don't seem to have %'d in U-Boot */
 863 void print_grouped_ull(unsigned long long int_val, int digits)
 864 {
 865         char str[21], *s;
 866         int grab = 3;
 867
 868         digits = (digits + 2) / 3;
 869         sprintf(str, "%*llu", digits * 3, int_val);
 870         for (s = str; *s; s += grab) {
 871                 if (s != str)
 872                         putc(s[-1] != ' ' ? ',' : ' ');
 873                 printf("%.*s", grab, s);
 874                 grab = 3;
 875         }
 876 }
 877
 878 bool str2off(const char *p, loff_t *num)
 879 {
 880         char *endptr;
 881
 882         *num = simple_strtoull(p, &endptr, 16);
 883         return *p != '\0' && *endptr == '\0';
 884 }
 885
 886 bool str2long(const char *p, ulong *num)
 887 {
 888         char *endptr;
 889
 890         *num = hextoul(p, &endptr);
 891         return *p != '\0' && *endptr == '\0';
 892 }
 893
 894 char *strmhz(char *buf, unsigned long hz)
 895 {
 896         long l, n;
 897         long m;
 898
 899         n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
 900         l = sprintf(buf, "%ld", n);
 901
 902         hz -= n * 1000000L;
 903         m = DIV_ROUND_CLOSEST(hz, 1000L);
 904         if (m != 0)
 905                 sprintf(buf + l, ".%03ld", m);
 906
 907         return buf;
 908 }