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 #define ERRSTR  128             /* %dE showing error string if enabled */
 149
 150 /*
 151  * Macro to add a new character to our output string, but only if it will
 152  * fit. The macro moves to the next character position in the output string.
 153  */
 154 #define ADDCH(str, ch) do { \
 155         if ((str) < end) \
 156                 *(str) = (ch); \
 157         ++str; \
 158         } while (0)
 159
 160 static char *number(char *buf, char *end, u64 num,
 161                 int base, int size, int precision, int type)
 162 {
 163         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 164         static const char digits[16] = "0123456789ABCDEF";
 165
 166         char tmp[66];
 167         char sign;
 168         char locase;
 169         int need_pfx = ((type & SPECIAL) && base != 10);
 170         int i;
 171
 172         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 173          * produces same digits or (maybe lowercased) letters */
 174         locase = (type & SMALL);
 175         if (type & LEFT)
 176                 type &= ~ZEROPAD;
 177         sign = 0;
 178         if (type & SIGN) {
 179                 if ((s64) num < 0) {
 180                         sign = '-';
 181                         num = -(s64) num;
 182                         size--;
 183                 } else if (type & PLUS) {
 184                         sign = '+';
 185                         size--;
 186                 } else if (type & SPACE) {
 187                         sign = ' ';
 188                         size--;
 189                 }
 190         }
 191         if (need_pfx) {
 192                 size--;
 193                 if (base == 16)
 194                         size--;
 195         }
 196
 197         /* generate full string in tmp[], in reverse order */
 198         i = 0;
 199         if (num == 0)
 200                 tmp[i++] = '0';
 201         /* Generic code, for any base:
 202         else do {
 203                 tmp[i++] = (digits[do_div(num,base)] | locase);
 204         } while (num != 0);
 205         */
 206         else if (base != 10) { /* 8 or 16 */
 207                 int mask = base - 1;
 208                 int shift = 3;
 209
 210                 if (base == 16)
 211                         shift = 4;
 212
 213                 do {
 214                         tmp[i++] = (digits[((unsigned char)num) & mask]
 215                                         | locase);
 216                         num >>= shift;
 217                 } while (num);
 218         } else { /* base 10 */
 219                 i = put_dec(tmp, num) - tmp;
 220         }
 221
 222         /* printing 100 using %2d gives "100", not "00" */
 223         if (i > precision)
 224                 precision = i;
 225         /* leading space padding */
 226         size -= precision;
 227         if (!(type & (ZEROPAD + LEFT))) {
 228                 while (--size >= 0)
 229                         ADDCH(buf, ' ');
 230         }
 231         /* sign */
 232         if (sign)
 233                 ADDCH(buf, sign);
 234         /* "0x" / "0" prefix */
 235         if (need_pfx) {
 236                 ADDCH(buf, '0');
 237                 if (base == 16)
 238                         ADDCH(buf, 'X' | locase);
 239         }
 240         /* zero or space padding */
 241         if (!(type & LEFT)) {
 242                 char c = (type & ZEROPAD) ? '0' : ' ';
 243
 244                 while (--size >= 0)
 245                         ADDCH(buf, c);
 246         }
 247         /* hmm even more zero padding? */
 248         while (i <= --precision)
 249                 ADDCH(buf, '0');
 250         /* actual digits of result */
 251         while (--i >= 0)
 252                 ADDCH(buf, tmp[i]);
 253         /* trailing space padding */
 254         while (--size >= 0)
 255                 ADDCH(buf, ' ');
 256         return buf;
 257 }
 258
 259 static char *string(char *buf, char *end, const char *s, int field_width,
 260                 int precision, int flags)
 261 {
 262         int len, i;
 263
 264         if (s == NULL)
 265                 s = "<NULL>";
 266
 267         len = strnlen(s, precision);
 268
 269         if (!(flags & LEFT))
 270                 while (len < field_width--)
 271                         ADDCH(buf, ' ');
 272         for (i = 0; i < len; ++i)
 273                 ADDCH(buf, *s++);
 274         while (len < field_width--)
 275                 ADDCH(buf, ' ');
 276         return buf;
 277 }
 278
 279 /* U-Boot uses UTF-16 strings in the EFI context only. */
 280 static __maybe_unused char *string16(char *buf, char *end, u16 *s,
 281                                      int field_width, int precision, int flags)
 282 {
 283         const u16 *str = s ? s : u"<NULL>";
 284         ssize_t i, len = utf16_strnlen(str, precision);
 285
 286         if (!(flags & LEFT))
 287                 for (; len < field_width; --field_width)
 288                         ADDCH(buf, ' ');
 289         if (buf < end)
 290                 *buf = 0;
 291         for (i = 0; i < len; ++i) {
 292                 int slen = utf16_utf8_strnlen(str, 1);
 293                 s32 s = utf16_get(&str);
 294
 295                 if (s < 0)
 296                         s = '?';
 297                 if (buf + slen < end) {
 298                         utf8_put(s, &buf);
 299                         if (buf < end)
 300                                 *buf = 0;
 301                 } else {
 302                         buf += slen;
 303                 }
 304         }
 305         for (; len < field_width; --field_width)
 306                 ADDCH(buf, ' ');
 307
 308         return buf;
 309 }
 310
 311 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
 312 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 313                                 int precision, int flags)
 314 {
 315         u16 *str;
 316
 317         /* If dp == NULL output the string '<NULL>' */
 318         if (!dp)
 319                 return string16(buf, end, dp, field_width, precision, flags);
 320
 321         str = efi_dp_str((struct efi_device_path *)dp);
 322         if (!str)
 323                 return ERR_PTR(-ENOMEM);
 324
 325         buf = string16(buf, end, str, field_width, precision, flags);
 326         efi_free_pool(str);
 327         return buf;
 328 }
 329 #endif
 330
 331 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 332                                 int precision, int flags)
 333 {
 334         /* (6 * 2 hex digits), 5 colons and trailing zero */
 335         char mac_addr[6 * 3];
 336         char *p = mac_addr;
 337         int i;
 338
 339         for (i = 0; i < 6; i++) {
 340                 p = hex_byte_pack(p, addr[i]);
 341                 if (!(flags & SPECIAL) && i != 5)
 342                         *p++ = ':';
 343         }
 344         *p = '\0';
 345
 346         return string(buf, end, mac_addr, field_width, precision,
 347                       flags & ~SPECIAL);
 348 }
 349
 350 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 351                          int precision, int flags)
 352 {
 353         /* (8 * 4 hex digits), 7 colons and trailing zero */
 354         char ip6_addr[8 * 5];
 355         char *p = ip6_addr;
 356         int i;
 357
 358         for (i = 0; i < 8; i++) {
 359                 p = hex_byte_pack(p, addr[2 * i]);
 360                 p = hex_byte_pack(p, addr[2 * i + 1]);
 361                 if (!(flags & SPECIAL) && i != 7)
 362                         *p++ = ':';
 363         }
 364         *p = '\0';
 365
 366         return string(buf, end, ip6_addr, field_width, precision,
 367                       flags & ~SPECIAL);
 368 }
 369
 370 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 371                          int precision, int flags)
 372 {
 373         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 374         char ip4_addr[4 * 4];
 375         char temp[3];   /* hold each IP quad in reverse order */
 376         char *p = ip4_addr;
 377         int i, digits;
 378
 379         for (i = 0; i < 4; i++) {
 380                 digits = put_dec_trunc(temp, addr[i]) - temp;
 381                 /* reverse the digits in the quad */
 382                 while (digits--)
 383                         *p++ = temp[digits];
 384                 if (i != 3)
 385                         *p++ = '.';
 386         }
 387         *p = '\0';
 388
 389         return string(buf, end, ip4_addr, field_width, precision,
 390                       flags & ~SPECIAL);
 391 }
 392
 393 #ifdef CONFIG_LIB_UUID
 394 /*
 395  * This works (roughly) the same way as Linux's.
 396  *
 397  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 398  *   %pUB:   01020304-0506-0708-090A-0B0C0D0E0F10
 399  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 400  *   %pUL:   04030201-0605-0807-090A-0B0C0D0E0F10
 401  *   %pUs:   GUID text representation if known or fallback to %pUl
 402  */
 403 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 404                          int precision, int flags, const char *fmt)
 405 {
 406         char uuid[UUID_STR_LEN + 1];
 407         int str_format;
 408         const char *str;
 409
 410         switch (*(++fmt)) {
 411         case 'L':
 412                 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
 413                 break;
 414         case 'l':
 415                 str_format = UUID_STR_FORMAT_GUID;
 416                 break;
 417         case 'B':
 418                 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
 419                 break;
 420         case 's':
 421                 str = uuid_guid_get_str(addr);
 422                 if (str)
 423                         return string(buf, end, str,
 424                                       field_width, precision, flags);
 425                 str_format = UUID_STR_FORMAT_GUID;
 426                 break;
 427         default:
 428                 str_format = UUID_STR_FORMAT_STD;
 429                 break;
 430         }
 431
 432         if (addr)
 433                 uuid_bin_to_str(addr, uuid, str_format);
 434         else
 435                 strcpy(uuid, "<NULL>");
 436
 437         return string(buf, end, uuid, field_width, precision, flags);
 438 }
 439 #endif
 440
 441 /*
 442  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 443  * by an extra set of alphanumeric characters that are extended format
 444  * specifiers.
 445  *
 446  * Right now we handle:
 447  *
 448  * - 'M' For a 6-byte MAC address, it prints the address in the
 449  *       usual colon-separated hex notation
 450  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 451  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 452  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 453  *       currently the same
 454  */
 455 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 456                 int field_width, int precision, int flags)
 457 {
 458         u64 num = (uintptr_t)ptr;
 459
 460         /*
 461          * Being a boot loader, we explicitly allow pointers to
 462          * (physical) address null.
 463          */
 464 #if 0
 465         if (!ptr)
 466                 return string(buf, end, "(null)", field_width, precision,
 467                               flags);
 468 #endif
 469
 470         switch (*fmt) {
 471 /* Device paths only exist in the EFI context. */
 472 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
 473         case 'D':
 474                 return device_path_string(buf, end, ptr, field_width,
 475                                           precision, flags);
 476 #endif
 477         case 'a':
 478                 flags |= SPECIAL | ZEROPAD;
 479
 480                 switch (fmt[1]) {
 481                 case 'p':
 482                 default:
 483                         field_width = sizeof(phys_addr_t) * 2 + 2;
 484                         num = *(phys_addr_t *)ptr;
 485                         break;
 486                 }
 487                 break;
 488         case 'm':
 489                 flags |= SPECIAL;
 490                 /* Fallthrough */
 491         case 'M':
 492                 return mac_address_string(buf, end, ptr, field_width,
 493                                           precision, flags);
 494         case 'i':
 495                 flags |= SPECIAL;
 496                 /* Fallthrough */
 497         case 'I':
 498                 if (IS_ENABLED(CONFIG_IPV6) && fmt[1] == '6')
 499                         return ip6_addr_string(buf, end, ptr, field_width,
 500                                                precision, flags);
 501                 if (fmt[1] == '4')
 502                         return ip4_addr_string(buf, end, ptr, field_width,
 503                                                precision, flags);
 504                 flags &= ~SPECIAL;
 505                 break;
 506 #ifdef CONFIG_LIB_UUID
 507         case 'U':
 508                 return uuid_string(buf, end, ptr, field_width, precision,
 509                                    flags, fmt);
 510 #endif
 511         default:
 512                 break;
 513         }
 514         flags |= SMALL;
 515         if (field_width == -1) {
 516                 field_width = 2*sizeof(void *);
 517                 flags |= ZEROPAD;
 518         }
 519         return number(buf, end, num, 16, field_width, precision, flags);
 520 }
 521
 522 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 523                               va_list args)
 524 {
 525         u64 num;
 526         int base;
 527         char *str;
 528
 529         int flags;              /* flags to number() */
 530
 531         int field_width;        /* width of output field */
 532         int precision;          /* min. # of digits for integers; max
 533                                    number of chars for from string */
 534         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 535                                 /* 'z' support added 23/7/1999 S.H.    */
 536                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 537                                 /* 't' added for ptrdiff_t */
 538         char *end = buf + size;
 539
 540         /* Make sure end is always >= buf - do we want this in U-Boot? */
 541         if (end < buf) {
 542                 end = ((void *)-1);
 543                 size = end - buf;
 544         }
 545         str = buf;
 546
 547         for (; *fmt ; ++fmt) {
 548                 if (*fmt != '%') {
 549                         ADDCH(str, *fmt);
 550                         continue;
 551                 }
 552
 553                 /* process flags */
 554                 flags = 0;
 555 repeat:
 556                         ++fmt;          /* this also skips first '%' */
 557                         switch (*fmt) {
 558                         case '-':
 559                                 flags |= LEFT;
 560                                 goto repeat;
 561                         case '+':
 562                                 flags |= PLUS;
 563                                 goto repeat;
 564                         case ' ':
 565                                 flags |= SPACE;
 566                                 goto repeat;
 567                         case '#':
 568                                 flags |= SPECIAL;
 569                                 goto repeat;
 570                         case '0':
 571                                 flags |= ZEROPAD;
 572                                 goto repeat;
 573                         }
 574
 575                 /* get field width */
 576                 field_width = -1;
 577                 if (is_digit(*fmt))
 578                         field_width = skip_atoi(&fmt);
 579                 else if (*fmt == '*') {
 580                         ++fmt;
 581                         /* it's the next argument */
 582                         field_width = va_arg(args, int);
 583                         if (field_width < 0) {
 584                                 field_width = -field_width;
 585                                 flags |= LEFT;
 586                         }
 587                 }
 588
 589                 /* get the precision */
 590                 precision = -1;
 591                 if (*fmt == '.') {
 592                         ++fmt;
 593                         if (is_digit(*fmt))
 594                                 precision = skip_atoi(&fmt);
 595                         else if (*fmt == '*') {
 596                                 ++fmt;
 597                                 /* it's the next argument */
 598                                 precision = va_arg(args, int);
 599                         }
 600                         if (precision < 0)
 601                                 precision = 0;
 602                 }
 603
 604                 /* get the conversion qualifier */
 605                 qualifier = -1;
 606                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 607                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 608                         qualifier = *fmt;
 609                         ++fmt;
 610                         if (qualifier == 'l' && *fmt == 'l') {
 611                                 qualifier = 'L';
 612                                 ++fmt;
 613                         }
 614                 }
 615
 616                 /* default base */
 617                 base = 10;
 618
 619                 switch (*fmt) {
 620                 case 'c':
 621                         if (!(flags & LEFT)) {
 622                                 while (--field_width > 0)
 623                                         ADDCH(str, ' ');
 624                         }
 625                         ADDCH(str, (unsigned char) va_arg(args, int));
 626                         while (--field_width > 0)
 627                                 ADDCH(str, ' ');
 628                         continue;
 629
 630                 case 's':
 631 /* U-Boot uses UTF-16 strings in the EFI context only. */
 632 #if (CONFIG_IS_ENABLED(EFI_LOADER) || CONFIG_IS_ENABLED(EFI_APP)) && \
 633         !defined(API_BUILD)
 634                         if (qualifier == 'l') {
 635                                 str = string16(str, end, va_arg(args, u16 *),
 636                                                field_width, precision, flags);
 637                         } else
 638 #endif
 639                         {
 640                                 str = string(str, end, va_arg(args, char *),
 641                                              field_width, precision, flags);
 642                         }
 643                         continue;
 644
 645                 case 'p':
 646                         str = pointer(fmt + 1, str, end,
 647                                         va_arg(args, void *),
 648                                         field_width, precision, flags);
 649                         if (IS_ERR(str))
 650                                 return PTR_ERR(str);
 651                         /* Skip all alphanumeric pointer suffixes */
 652                         while (isalnum(fmt[1]))
 653                                 fmt++;
 654                         continue;
 655
 656                 case 'n':
 657                         if (qualifier == 'l') {
 658                                 long *ip = va_arg(args, long *);
 659                                 *ip = (str - buf);
 660                         } else {
 661                                 int *ip = va_arg(args, int *);
 662                                 *ip = (str - buf);
 663                         }
 664                         continue;
 665
 666                 case '%':
 667                         ADDCH(str, '%');
 668                         continue;
 669
 670                 /* integer number formats - set up the flags and "break" */
 671                 case 'o':
 672                         base = 8;
 673                         break;
 674
 675                 case 'x':
 676                         flags |= SMALL;
 677                 case 'X':
 678                         base = 16;
 679                         break;
 680
 681                 case 'd':
 682                         if (fmt[1] == 'E')
 683                                 flags |= ERRSTR;
 684                 case 'i':
 685                         flags |= SIGN;
 686                 case 'u':
 687                         break;
 688
 689                 default:
 690                         ADDCH(str, '%');
 691                         if (*fmt)
 692                                 ADDCH(str, *fmt);
 693                         else
 694                                 --fmt;
 695                         continue;
 696                 }
 697                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 698                         num = va_arg(args, unsigned long long);
 699                 else if (qualifier == 'l') {
 700                         num = va_arg(args, unsigned long);
 701                         if (flags & SIGN)
 702                                 num = (signed long) num;
 703                 } else if (qualifier == 'Z' || qualifier == 'z') {
 704                         num = va_arg(args, size_t);
 705                 } else if (qualifier == 't') {
 706                         num = va_arg(args, ptrdiff_t);
 707                 } else if (qualifier == 'h') {
 708                         num = (unsigned short) va_arg(args, int);
 709                         if (flags & SIGN)
 710                                 num = (signed short) num;
 711                 } else {
 712                         num = va_arg(args, unsigned int);
 713                         if (flags & SIGN)
 714                                 num = (signed int) num;
 715                 }
 716                 str = number(str, end, num, base, field_width, precision,
 717                              flags);
 718                 if (IS_ENABLED(CONFIG_ERRNO_STR) && (flags & ERRSTR)) {
 719                         const char *p;
 720
 721                         ADDCH(str, ':');
 722                         ADDCH(str, ' ');
 723                         for (p = errno_str(num); *p; p++)
 724                                 ADDCH(str, *p);
 725                         fmt++;
 726                 }
 727         }
 728
 729         if (size > 0) {
 730                 ADDCH(str, '\0');
 731                 if (str > end)
 732                         end[-1] = '\0';
 733                 --str;
 734         }
 735         /* the trailing null byte doesn't count towards the total */
 736         return str - buf;
 737 }
 738
 739 int vsnprintf(char *buf, size_t size, const char *fmt,
 740                               va_list args)
 741 {
 742         return vsnprintf_internal(buf, size, fmt, args);
 743 }
 744
 745 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 746 {
 747         int i;
 748
 749         i = vsnprintf(buf, size, fmt, args);
 750
 751         if (likely(i < size))
 752                 return i;
 753         if (size != 0)
 754                 return size - 1;
 755         return 0;
 756 }
 757
 758 int snprintf(char *buf, size_t size, const char *fmt, ...)
 759 {
 760         va_list args;
 761         int i;
 762
 763         va_start(args, fmt);
 764         i = vsnprintf(buf, size, fmt, args);
 765         va_end(args);
 766
 767         return i;
 768 }
 769
 770 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 771 {
 772         va_list args;
 773         int i;
 774
 775         va_start(args, fmt);
 776         i = vscnprintf(buf, size, fmt, args);
 777         va_end(args);
 778
 779         return i;
 780 }
 781
 782 /**
 783  * Format a string and place it in a buffer (va_list version)
 784  *
 785  * @param buf   The buffer to place the result into
 786  * @param fmt   The format string to use
 787  * @param args  Arguments for the format string
 788  *
 789  * The function returns the number of characters written
 790  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 791  * buffer overflows.
 792  *
 793  * If you're not already dealing with a va_list consider using sprintf().
 794  */
 795 int vsprintf(char *buf, const char *fmt, va_list args)
 796 {
 797         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 798 }
 799
 800 int sprintf(char *buf, const char *fmt, ...)
 801 {
 802         va_list args;
 803         int i;
 804
 805         va_start(args, fmt);
 806         i = vsprintf(buf, fmt, args);
 807         va_end(args);
 808         return i;
 809 }
 810
 811 #if CONFIG_IS_ENABLED(PRINTF)
 812 int printf(const char *fmt, ...)
 813 {
 814         va_list args;
 815         uint i;
 816
 817         va_start(args, fmt);
 818         i = vprintf(fmt, args);
 819         va_end(args);
 820
 821         return i;
 822 }
 823
 824 int vprintf(const char *fmt, va_list args)
 825 {
 826         uint i;
 827         char printbuffer[CONFIG_SYS_PBSIZE];
 828
 829         /*
 830          * For this to work, printbuffer must be larger than
 831          * anything we ever want to print.
 832          */
 833         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 834
 835         /* Handle error */
 836         if (i <= 0)
 837                 return i;
 838         /* Print the string */
 839         puts(printbuffer);
 840         return i;
 841 }
 842 #endif
 843
 844 static char local_toa[22];
 845
 846 char *simple_itoa(ulong i)
 847 {
 848         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 849         char *p = &local_toa[21];
 850
 851         *p-- = '\0';
 852         do {
 853                 *p-- = '0' + i % 10;
 854                 i /= 10;
 855         } while (i > 0);
 856         return p + 1;
 857 }
 858
 859 char *simple_xtoa(ulong num)
 860 {
 861         /* 16 digits plus nul terminator, good for 64-bit or smaller ints */
 862         char *p = &local_toa[17];
 863
 864         *--p = '\0';
 865         do {
 866                 p -= 2;
 867                 hex_byte_pack(p, num & 0xff);
 868                 num >>= 8;
 869         } while (num > 0);
 870
 871         return p;
 872 }
 873
 874 /* We don't seem to have %'d in U-Boot */
 875 void print_grouped_ull(unsigned long long int_val, int digits)
 876 {
 877         char str[21], *s;
 878         int grab = 3;
 879
 880         digits = (digits + 2) / 3;
 881         sprintf(str, "%*llu", digits * 3, int_val);
 882         for (s = str; *s; s += grab) {
 883                 if (s != str)
 884                         putc(s[-1] != ' ' ? ',' : ' ');
 885                 printf("%.*s", grab, s);
 886                 grab = 3;
 887         }
 888 }
 889
 890 bool str2off(const char *p, loff_t *num)
 891 {
 892         char *endptr;
 893
 894         *num = simple_strtoull(p, &endptr, 16);
 895         return *p != '\0' && *endptr == '\0';
 896 }
 897
 898 bool str2long(const char *p, ulong *num)
 899 {
 900         char *endptr;
 901
 902         *num = hextoul(p, &endptr);
 903         return *p != '\0' && *endptr == '\0';
 904 }
 905
 906 char *strmhz(char *buf, unsigned long hz)
 907 {
 908         long l, n;
 909         long m;
 910
 911         n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
 912         l = sprintf(buf, "%ld", n);
 913
 914         hz -= n * 1000000L;
 915         m = DIV_ROUND_CLOSEST(hz, 1000L);
 916         if (m != 0)
 917                 sprintf(buf + l, ".%03ld", m);
 918
 919         return buf;
 920 }