lib/vsprintf.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  */
   6
   7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
   8 /*
   9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  10  *
  11  * from hush: simple_itoa() was lifted from boa-0.93.15
  12  */
  13
  14 #include <common.h>
  15 #include <charset.h>
  16 #include <efi_loader.h>
  17 #include <div64.h>
  18 #include <uuid.h>
  19 #include <stdarg.h>
  20 #include <linux/ctype.h>
  21 #include <linux/err.h>
  22 #include <linux/types.h>
  23 #include <linux/string.h>
  24
  25 #define noinline __attribute__((noinline))
  26
  27 /* we use this so that we can do without the ctype library */
  28 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  29
  30 static int skip_atoi(const char **s)
  31 {
  32         int i = 0;
  33
  34         while (is_digit(**s))
  35                 i = i * 10 + *((*s)++) - '0';
  36
  37         return i;
  38 }
  39
  40 /* Decimal conversion is by far the most typical, and is used
  41  * for /proc and /sys data. This directly impacts e.g. top performance
  42  * with many processes running. We optimize it for speed
  43  * using code from
  44  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  45  * (with permission from the author, Douglas W. Jones). */
  46
  47 /* Formats correctly any integer in [0,99999].
  48  * Outputs from one to five digits depending on input.
  49  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  50 static char *put_dec_trunc(char *buf, unsigned q)
  51 {
  52         unsigned d3, d2, d1, d0;
  53         d1 = (q>>4) & 0xf;
  54         d2 = (q>>8) & 0xf;
  55         d3 = (q>>12);
  56
  57         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  58         q = (d0 * 0xcd) >> 11;
  59         d0 = d0 - 10*q;
  60         *buf++ = d0 + '0'; /* least significant digit */
  61         d1 = q + 9*d3 + 5*d2 + d1;
  62         if (d1 != 0) {
  63                 q = (d1 * 0xcd) >> 11;
  64                 d1 = d1 - 10*q;
  65                 *buf++ = d1 + '0'; /* next digit */
  66
  67                 d2 = q + 2*d2;
  68                 if ((d2 != 0) || (d3 != 0)) {
  69                         q = (d2 * 0xd) >> 7;
  70                         d2 = d2 - 10*q;
  71                         *buf++ = d2 + '0'; /* next digit */
  72
  73                         d3 = q + 4*d3;
  74                         if (d3 != 0) {
  75                                 q = (d3 * 0xcd) >> 11;
  76                                 d3 = d3 - 10*q;
  77                                 *buf++ = d3 + '0';  /* next digit */
  78                                 if (q != 0)
  79                                         *buf++ = q + '0'; /* most sign. digit */
  80                         }
  81                 }
  82         }
  83         return buf;
  84 }
  85 /* Same with if's removed. Always emits five digits */
  86 static char *put_dec_full(char *buf, unsigned q)
  87 {
  88         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  89         /* but anyway, gcc produces better code with full-sized ints */
  90         unsigned d3, d2, d1, d0;
  91         d1 = (q>>4) & 0xf;
  92         d2 = (q>>8) & 0xf;
  93         d3 = (q>>12);
  94
  95         /*
  96          * Possible ways to approx. divide by 10
  97          * gcc -O2 replaces multiply with shifts and adds
  98          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
  99          * (x * 0x67) >> 10:  1100111
 100          * (x * 0x34) >> 9:    110100 - same
 101          * (x * 0x1a) >> 8:     11010 - same
 102          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 103          */
 104
 105         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 106         q = (d0 * 0xcd) >> 11;
 107         d0 = d0 - 10*q;
 108         *buf++ = d0 + '0';
 109         d1 = q + 9*d3 + 5*d2 + d1;
 110                 q = (d1 * 0xcd) >> 11;
 111                 d1 = d1 - 10*q;
 112                 *buf++ = d1 + '0';
 113
 114                 d2 = q + 2*d2;
 115                         q = (d2 * 0xd) >> 7;
 116                         d2 = d2 - 10*q;
 117                         *buf++ = d2 + '0';
 118
 119                         d3 = q + 4*d3;
 120                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 121                                 /* q = (d3 * 0x67) >> 10; - would also work */
 122                                 d3 = d3 - 10*q;
 123                                 *buf++ = d3 + '0';
 124                                         *buf++ = q + '0';
 125         return buf;
 126 }
 127 /* No inlining helps gcc to use registers better */
 128 static noinline char *put_dec(char *buf, uint64_t num)
 129 {
 130         while (1) {
 131                 unsigned rem;
 132                 if (num < 100000)
 133                         return put_dec_trunc(buf, num);
 134                 rem = do_div(num, 100000);
 135                 buf = put_dec_full(buf, rem);
 136         }
 137 }
 138
 139 #define ZEROPAD 1               /* pad with zero */
 140 #define SIGN    2               /* unsigned/signed long */
 141 #define PLUS    4               /* show plus */
 142 #define SPACE   8               /* space if plus */
 143 #define LEFT    16              /* left justified */
 144 #define SMALL   32              /* Must be 32 == 0x20 */
 145 #define SPECIAL 64              /* 0x */
 146
 147 /*
 148  * Macro to add a new character to our output string, but only if it will
 149  * fit. The macro moves to the next character position in the output string.
 150  */
 151 #define ADDCH(str, ch) do { \
 152         if ((str) < end) \
 153                 *(str) = (ch); \
 154         ++str; \
 155         } while (0)
 156
 157 static char *number(char *buf, char *end, u64 num,
 158                 int base, int size, int precision, int type)
 159 {
 160         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 161         static const char digits[16] = "0123456789ABCDEF";
 162
 163         char tmp[66];
 164         char sign;
 165         char locase;
 166         int need_pfx = ((type & SPECIAL) && base != 10);
 167         int i;
 168
 169         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 170          * produces same digits or (maybe lowercased) letters */
 171         locase = (type & SMALL);
 172         if (type & LEFT)
 173                 type &= ~ZEROPAD;
 174         sign = 0;
 175         if (type & SIGN) {
 176                 if ((s64) num < 0) {
 177                         sign = '-';
 178                         num = -(s64) num;
 179                         size--;
 180                 } else if (type & PLUS) {
 181                         sign = '+';
 182                         size--;
 183                 } else if (type & SPACE) {
 184                         sign = ' ';
 185                         size--;
 186                 }
 187         }
 188         if (need_pfx) {
 189                 size--;
 190                 if (base == 16)
 191                         size--;
 192         }
 193
 194         /* generate full string in tmp[], in reverse order */
 195         i = 0;
 196         if (num == 0)
 197                 tmp[i++] = '0';
 198         /* Generic code, for any base:
 199         else do {
 200                 tmp[i++] = (digits[do_div(num,base)] | locase);
 201         } while (num != 0);
 202         */
 203         else if (base != 10) { /* 8 or 16 */
 204                 int mask = base - 1;
 205                 int shift = 3;
 206
 207                 if (base == 16)
 208                         shift = 4;
 209
 210                 do {
 211                         tmp[i++] = (digits[((unsigned char)num) & mask]
 212                                         | locase);
 213                         num >>= shift;
 214                 } while (num);
 215         } else { /* base 10 */
 216                 i = put_dec(tmp, num) - tmp;
 217         }
 218
 219         /* printing 100 using %2d gives "100", not "00" */
 220         if (i > precision)
 221                 precision = i;
 222         /* leading space padding */
 223         size -= precision;
 224         if (!(type & (ZEROPAD + LEFT))) {
 225                 while (--size >= 0)
 226                         ADDCH(buf, ' ');
 227         }
 228         /* sign */
 229         if (sign)
 230                 ADDCH(buf, sign);
 231         /* "0x" / "0" prefix */
 232         if (need_pfx) {
 233                 ADDCH(buf, '0');
 234                 if (base == 16)
 235                         ADDCH(buf, 'X' | locase);
 236         }
 237         /* zero or space padding */
 238         if (!(type & LEFT)) {
 239                 char c = (type & ZEROPAD) ? '0' : ' ';
 240
 241                 while (--size >= 0)
 242                         ADDCH(buf, c);
 243         }
 244         /* hmm even more zero padding? */
 245         while (i <= --precision)
 246                 ADDCH(buf, '0');
 247         /* actual digits of result */
 248         while (--i >= 0)
 249                 ADDCH(buf, tmp[i]);
 250         /* trailing space padding */
 251         while (--size >= 0)
 252                 ADDCH(buf, ' ');
 253         return buf;
 254 }
 255
 256 static char *string(char *buf, char *end, char *s, int field_width,
 257                 int precision, int flags)
 258 {
 259         int len, i;
 260
 261         if (s == NULL)
 262                 s = "<NULL>";
 263
 264         len = strnlen(s, precision);
 265
 266         if (!(flags & LEFT))
 267                 while (len < field_width--)
 268                         ADDCH(buf, ' ');
 269         for (i = 0; i < len; ++i)
 270                 ADDCH(buf, *s++);
 271         while (len < field_width--)
 272                 ADDCH(buf, ' ');
 273         return buf;
 274 }
 275
 276 static char *string16(char *buf, char *end, u16 *s, int field_width,
 277                 int precision, int flags)
 278 {
 279         u16 *str = s ? s : L"<NULL>";
 280         int utf16_len = utf16_strnlen(str, precision);
 281         u8 utf8[utf16_len * MAX_UTF8_PER_UTF16];
 282         int utf8_len, i;
 283
 284         utf8_len = utf16_to_utf8(utf8, str, utf16_len) - utf8;
 285
 286         if (!(flags & LEFT))
 287                 while (utf8_len < field_width--)
 288                         ADDCH(buf, ' ');
 289         for (i = 0; i < utf8_len; ++i)
 290                 ADDCH(buf, utf8[i]);
 291         while (utf8_len < field_width--)
 292                 ADDCH(buf, ' ');
 293         return buf;
 294 }
 295
 296 #if defined(CONFIG_EFI_LOADER) && \
 297         !defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
 298 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 299                                 int precision, int flags)
 300 {
 301         u16 *str;
 302
 303         /* If dp == NULL output the string '<NULL>' */
 304         if (!dp)
 305                 return string16(buf, end, dp, field_width, precision, flags);
 306
 307         str = efi_dp_str((struct efi_device_path *)dp);
 308         if (!str)
 309                 return ERR_PTR(-ENOMEM);
 310
 311         buf = string16(buf, end, str, field_width, precision, flags);
 312         efi_free_pool(str);
 313         return buf;
 314 }
 315 #endif
 316
 317 #ifdef CONFIG_CMD_NET
 318 static const char hex_asc[] = "0123456789abcdef";
 319 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
 320 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
 321
 322 static inline char *pack_hex_byte(char *buf, u8 byte)
 323 {
 324         *buf++ = hex_asc_hi(byte);
 325         *buf++ = hex_asc_lo(byte);
 326         return buf;
 327 }
 328
 329 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 330                                 int precision, int flags)
 331 {
 332         /* (6 * 2 hex digits), 5 colons and trailing zero */
 333         char mac_addr[6 * 3];
 334         char *p = mac_addr;
 335         int i;
 336
 337         for (i = 0; i < 6; i++) {
 338                 p = pack_hex_byte(p, addr[i]);
 339                 if (!(flags & SPECIAL) && i != 5)
 340                         *p++ = ':';
 341         }
 342         *p = '\0';
 343
 344         return string(buf, end, mac_addr, field_width, precision,
 345                       flags & ~SPECIAL);
 346 }
 347
 348 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 349                          int precision, int flags)
 350 {
 351         /* (8 * 4 hex digits), 7 colons and trailing zero */
 352         char ip6_addr[8 * 5];
 353         char *p = ip6_addr;
 354         int i;
 355
 356         for (i = 0; i < 8; i++) {
 357                 p = pack_hex_byte(p, addr[2 * i]);
 358                 p = pack_hex_byte(p, addr[2 * i + 1]);
 359                 if (!(flags & SPECIAL) && i != 7)
 360                         *p++ = ':';
 361         }
 362         *p = '\0';
 363
 364         return string(buf, end, ip6_addr, field_width, precision,
 365                       flags & ~SPECIAL);
 366 }
 367
 368 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 369                          int precision, int flags)
 370 {
 371         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 372         char ip4_addr[4 * 4];
 373         char temp[3];   /* hold each IP quad in reverse order */
 374         char *p = ip4_addr;
 375         int i, digits;
 376
 377         for (i = 0; i < 4; i++) {
 378                 digits = put_dec_trunc(temp, addr[i]) - temp;
 379                 /* reverse the digits in the quad */
 380                 while (digits--)
 381                         *p++ = temp[digits];
 382                 if (i != 3)
 383                         *p++ = '.';
 384         }
 385         *p = '\0';
 386
 387         return string(buf, end, ip4_addr, field_width, precision,
 388                       flags & ~SPECIAL);
 389 }
 390 #endif
 391
 392 #ifdef CONFIG_LIB_UUID
 393 /*
 394  * This works (roughly) the same way as linux's, but we currently always
 395  * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
 396  * mostly just because that is what uuid_bin_to_str() supports.
 397  *
 398  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 399  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 400  */
 401 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 402                          int precision, int flags, const char *fmt)
 403 {
 404         char uuid[UUID_STR_LEN + 1];
 405         int str_format = UUID_STR_FORMAT_STD;
 406
 407         switch (*(++fmt)) {
 408         case 'L':
 409         case 'l':
 410                 str_format = UUID_STR_FORMAT_GUID;
 411                 break;
 412         case 'B':
 413         case 'b':
 414                 /* this is the default */
 415                 break;
 416         default:
 417                 break;
 418         }
 419
 420         uuid_bin_to_str(addr, uuid, str_format);
 421
 422         return string(buf, end, uuid, field_width, precision, flags);
 423 }
 424 #endif
 425
 426 /*
 427  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 428  * by an extra set of alphanumeric characters that are extended format
 429  * specifiers.
 430  *
 431  * Right now we handle:
 432  *
 433  * - 'M' For a 6-byte MAC address, it prints the address in the
 434  *       usual colon-separated hex notation
 435  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 436  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 437  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 438  *       currently the same
 439  *
 440  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 441  * function pointers are really function descriptors, which contain a
 442  * pointer to the real address.
 443  */
 444 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 445                 int field_width, int precision, int flags)
 446 {
 447         u64 num = (uintptr_t)ptr;
 448
 449         /*
 450          * Being a boot loader, we explicitly allow pointers to
 451          * (physical) address null.
 452          */
 453 #if 0
 454         if (!ptr)
 455                 return string(buf, end, "(null)", field_width, precision,
 456                               flags);
 457 #endif
 458
 459         switch (*fmt) {
 460 #if defined(CONFIG_EFI_LOADER) && \
 461         !defined(CONFIG_SPL_BUILD) && !defined(API_BUILD)
 462         case 'D':
 463                 return device_path_string(buf, end, ptr, field_width,
 464                                           precision, flags);
 465 #endif
 466 #ifdef CONFIG_CMD_NET
 467         case 'a':
 468                 flags |= SPECIAL | ZEROPAD;
 469
 470                 switch (fmt[1]) {
 471                 case 'p':
 472                 default:
 473                         field_width = sizeof(phys_addr_t) * 2 + 2;
 474                         num = *(phys_addr_t *)ptr;
 475                         break;
 476                 }
 477                 break;
 478         case 'm':
 479                 flags |= SPECIAL;
 480                 /* Fallthrough */
 481         case 'M':
 482                 return mac_address_string(buf, end, ptr, field_width,
 483                                           precision, flags);
 484         case 'i':
 485                 flags |= SPECIAL;
 486                 /* Fallthrough */
 487         case 'I':
 488                 if (fmt[1] == '6')
 489                         return ip6_addr_string(buf, end, ptr, field_width,
 490                                                precision, flags);
 491                 if (fmt[1] == '4')
 492                         return ip4_addr_string(buf, end, ptr, field_width,
 493                                                precision, flags);
 494                 flags &= ~SPECIAL;
 495                 break;
 496 #endif
 497 #ifdef CONFIG_LIB_UUID
 498         case 'U':
 499                 return uuid_string(buf, end, ptr, field_width, precision,
 500                                    flags, fmt);
 501 #endif
 502         default:
 503                 break;
 504         }
 505         flags |= SMALL;
 506         if (field_width == -1) {
 507                 field_width = 2*sizeof(void *);
 508                 flags |= ZEROPAD;
 509         }
 510         return number(buf, end, num, 16, field_width, precision, flags);
 511 }
 512
 513 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 514                               va_list args)
 515 {
 516         u64 num;
 517         int base;
 518         char *str;
 519
 520         int flags;              /* flags to number() */
 521
 522         int field_width;        /* width of output field */
 523         int precision;          /* min. # of digits for integers; max
 524                                    number of chars for from string */
 525         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 526                                 /* 'z' support added 23/7/1999 S.H.    */
 527                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 528                                 /* 't' added for ptrdiff_t */
 529         char *end = buf + size;
 530
 531         /* Make sure end is always >= buf - do we want this in U-Boot? */
 532         if (end < buf) {
 533                 end = ((void *)-1);
 534                 size = end - buf;
 535         }
 536         str = buf;
 537
 538         for (; *fmt ; ++fmt) {
 539                 if (*fmt != '%') {
 540                         ADDCH(str, *fmt);
 541                         continue;
 542                 }
 543
 544                 /* process flags */
 545                 flags = 0;
 546 repeat:
 547                         ++fmt;          /* this also skips first '%' */
 548                         switch (*fmt) {
 549                         case '-':
 550                                 flags |= LEFT;
 551                                 goto repeat;
 552                         case '+':
 553                                 flags |= PLUS;
 554                                 goto repeat;
 555                         case ' ':
 556                                 flags |= SPACE;
 557                                 goto repeat;
 558                         case '#':
 559                                 flags |= SPECIAL;
 560                                 goto repeat;
 561                         case '0':
 562                                 flags |= ZEROPAD;
 563                                 goto repeat;
 564                         }
 565
 566                 /* get field width */
 567                 field_width = -1;
 568                 if (is_digit(*fmt))
 569                         field_width = skip_atoi(&fmt);
 570                 else if (*fmt == '*') {
 571                         ++fmt;
 572                         /* it's the next argument */
 573                         field_width = va_arg(args, int);
 574                         if (field_width < 0) {
 575                                 field_width = -field_width;
 576                                 flags |= LEFT;
 577                         }
 578                 }
 579
 580                 /* get the precision */
 581                 precision = -1;
 582                 if (*fmt == '.') {
 583                         ++fmt;
 584                         if (is_digit(*fmt))
 585                                 precision = skip_atoi(&fmt);
 586                         else if (*fmt == '*') {
 587                                 ++fmt;
 588                                 /* it's the next argument */
 589                                 precision = va_arg(args, int);
 590                         }
 591                         if (precision < 0)
 592                                 precision = 0;
 593                 }
 594
 595                 /* get the conversion qualifier */
 596                 qualifier = -1;
 597                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 598                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 599                         qualifier = *fmt;
 600                         ++fmt;
 601                         if (qualifier == 'l' && *fmt == 'l') {
 602                                 qualifier = 'L';
 603                                 ++fmt;
 604                         }
 605                 }
 606
 607                 /* default base */
 608                 base = 10;
 609
 610                 switch (*fmt) {
 611                 case 'c':
 612                         if (!(flags & LEFT)) {
 613                                 while (--field_width > 0)
 614                                         ADDCH(str, ' ');
 615                         }
 616                         ADDCH(str, (unsigned char) va_arg(args, int));
 617                         while (--field_width > 0)
 618                                 ADDCH(str, ' ');
 619                         continue;
 620
 621                 case 's':
 622                         if (qualifier == 'l' && !IS_ENABLED(CONFIG_SPL_BUILD)) {
 623                                 str = string16(str, end, va_arg(args, u16 *),
 624                                                field_width, precision, flags);
 625                         } else {
 626                                 str = string(str, end, va_arg(args, char *),
 627                                              field_width, precision, flags);
 628                         }
 629                         continue;
 630
 631                 case 'p':
 632                         str = pointer(fmt + 1, str, end,
 633                                         va_arg(args, void *),
 634                                         field_width, precision, flags);
 635                         if (IS_ERR(str))
 636                                 return PTR_ERR(str);
 637                         /* Skip all alphanumeric pointer suffixes */
 638                         while (isalnum(fmt[1]))
 639                                 fmt++;
 640                         continue;
 641
 642                 case 'n':
 643                         if (qualifier == 'l') {
 644                                 long *ip = va_arg(args, long *);
 645                                 *ip = (str - buf);
 646                         } else {
 647                                 int *ip = va_arg(args, int *);
 648                                 *ip = (str - buf);
 649                         }
 650                         continue;
 651
 652                 case '%':
 653                         ADDCH(str, '%');
 654                         continue;
 655
 656                 /* integer number formats - set up the flags and "break" */
 657                 case 'o':
 658                         base = 8;
 659                         break;
 660
 661                 case 'x':
 662                         flags |= SMALL;
 663                 case 'X':
 664                         base = 16;
 665                         break;
 666
 667                 case 'd':
 668                 case 'i':
 669                         flags |= SIGN;
 670                 case 'u':
 671                         break;
 672
 673                 default:
 674                         ADDCH(str, '%');
 675                         if (*fmt)
 676                                 ADDCH(str, *fmt);
 677                         else
 678                                 --fmt;
 679                         continue;
 680                 }
 681                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 682                         num = va_arg(args, unsigned long long);
 683                 else if (qualifier == 'l') {
 684                         num = va_arg(args, unsigned long);
 685                         if (flags & SIGN)
 686                                 num = (signed long) num;
 687                 } else if (qualifier == 'Z' || qualifier == 'z') {
 688                         num = va_arg(args, size_t);
 689                 } else if (qualifier == 't') {
 690                         num = va_arg(args, ptrdiff_t);
 691                 } else if (qualifier == 'h') {
 692                         num = (unsigned short) va_arg(args, int);
 693                         if (flags & SIGN)
 694                                 num = (signed short) num;
 695                 } else {
 696                         num = va_arg(args, unsigned int);
 697                         if (flags & SIGN)
 698                                 num = (signed int) num;
 699                 }
 700                 str = number(str, end, num, base, field_width, precision,
 701                              flags);
 702         }
 703
 704         if (size > 0) {
 705                 ADDCH(str, '\0');
 706                 if (str > end)
 707                         end[-1] = '\0';
 708                 --str;
 709         }
 710         /* the trailing null byte doesn't count towards the total */
 711         return str - buf;
 712 }
 713
 714 int vsnprintf(char *buf, size_t size, const char *fmt,
 715                               va_list args)
 716 {
 717         return vsnprintf_internal(buf, size, fmt, args);
 718 }
 719
 720 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 721 {
 722         int i;
 723
 724         i = vsnprintf(buf, size, fmt, args);
 725
 726         if (likely(i < size))
 727                 return i;
 728         if (size != 0)
 729                 return size - 1;
 730         return 0;
 731 }
 732
 733 int snprintf(char *buf, size_t size, const char *fmt, ...)
 734 {
 735         va_list args;
 736         int i;
 737
 738         va_start(args, fmt);
 739         i = vsnprintf(buf, size, fmt, args);
 740         va_end(args);
 741
 742         return i;
 743 }
 744
 745 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 746 {
 747         va_list args;
 748         int i;
 749
 750         va_start(args, fmt);
 751         i = vscnprintf(buf, size, fmt, args);
 752         va_end(args);
 753
 754         return i;
 755 }
 756
 757 /**
 758  * Format a string and place it in a buffer (va_list version)
 759  *
 760  * @param buf   The buffer to place the result into
 761  * @param fmt   The format string to use
 762  * @param args  Arguments for the format string
 763  *
 764  * The function returns the number of characters written
 765  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 766  * buffer overflows.
 767  *
 768  * If you're not already dealing with a va_list consider using sprintf().
 769  */
 770 int vsprintf(char *buf, const char *fmt, va_list args)
 771 {
 772         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 773 }
 774
 775 int sprintf(char *buf, const char *fmt, ...)
 776 {
 777         va_list args;
 778         int i;
 779
 780         va_start(args, fmt);
 781         i = vsprintf(buf, fmt, args);
 782         va_end(args);
 783         return i;
 784 }
 785
 786 int printf(const char *fmt, ...)
 787 {
 788         va_list args;
 789         uint i;
 790         char printbuffer[CONFIG_SYS_PBSIZE];
 791
 792         va_start(args, fmt);
 793
 794         /*
 795          * For this to work, printbuffer must be larger than
 796          * anything we ever want to print.
 797          */
 798         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 799         va_end(args);
 800
 801         /* Handle error */
 802         if (i <= 0)
 803                 return i;
 804         /* Print the string */
 805         puts(printbuffer);
 806         return i;
 807 }
 808
 809 int vprintf(const char *fmt, va_list args)
 810 {
 811         uint i;
 812         char printbuffer[CONFIG_SYS_PBSIZE];
 813
 814         /*
 815          * For this to work, printbuffer must be larger than
 816          * anything we ever want to print.
 817          */
 818         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 819
 820         /* Handle error */
 821         if (i <= 0)
 822                 return i;
 823         /* Print the string */
 824         puts(printbuffer);
 825         return i;
 826 }
 827
 828
 829 void __assert_fail(const char *assertion, const char *file, unsigned line,
 830                    const char *function)
 831 {
 832         /* This will not return */
 833         panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
 834               assertion);
 835 }
 836
 837 char *simple_itoa(ulong i)
 838 {
 839         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 840         static char local[22];
 841         char *p = &local[21];
 842
 843         *p-- = '\0';
 844         do {
 845                 *p-- = '0' + i % 10;
 846                 i /= 10;
 847         } while (i > 0);
 848         return p + 1;
 849 }
 850
 851 /* We don't seem to have %'d in U-Boot */
 852 void print_grouped_ull(unsigned long long int_val, int digits)
 853 {
 854         char str[21], *s;
 855         int grab = 3;
 856
 857         digits = (digits + 2) / 3;
 858         sprintf(str, "%*llu", digits * 3, int_val);
 859         for (s = str; *s; s += grab) {
 860                 if (s != str)
 861                         putc(s[-1] != ' ' ? ',' : ' ');
 862                 printf("%.*s", grab, s);
 863                 grab = 3;
 864         }
 865 }
 866
 867 bool str2off(const char *p, loff_t *num)
 868 {
 869         char *endptr;
 870
 871         *num = simple_strtoull(p, &endptr, 16);
 872         return *p != '\0' && *endptr == '\0';
 873 }
 874
 875 bool str2long(const char *p, ulong *num)
 876 {
 877         char *endptr;
 878
 879         *num = simple_strtoul(p, &endptr, 16);
 880         return *p != '\0' && *endptr == '\0';
 881 }