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 <hexdump.h>
  19 #include <uuid.h>
  20 #include <stdarg.h>
  21 #include <linux/ctype.h>
  22 #include <linux/err.h>
  23 #include <linux/types.h>
  24 #include <linux/string.h>
  25
  26 #define noinline __attribute__((noinline))
  27
  28 /* we use this so that we can do without the ctype library */
  29 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  30
  31 static int skip_atoi(const char **s)
  32 {
  33         int i = 0;
  34
  35         while (is_digit(**s))
  36                 i = i * 10 + *((*s)++) - '0';
  37
  38         return i;
  39 }
  40
  41 /* Decimal conversion is by far the most typical, and is used
  42  * for /proc and /sys data. This directly impacts e.g. top performance
  43  * with many processes running. We optimize it for speed
  44  * using code from
  45  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  46  * (with permission from the author, Douglas W. Jones). */
  47
  48 /* Formats correctly any integer in [0,99999].
  49  * Outputs from one to five digits depending on input.
  50  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  51 static char *put_dec_trunc(char *buf, unsigned q)
  52 {
  53         unsigned d3, d2, d1, d0;
  54         d1 = (q>>4) & 0xf;
  55         d2 = (q>>8) & 0xf;
  56         d3 = (q>>12);
  57
  58         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  59         q = (d0 * 0xcd) >> 11;
  60         d0 = d0 - 10*q;
  61         *buf++ = d0 + '0'; /* least significant digit */
  62         d1 = q + 9*d3 + 5*d2 + d1;
  63         if (d1 != 0) {
  64                 q = (d1 * 0xcd) >> 11;
  65                 d1 = d1 - 10*q;
  66                 *buf++ = d1 + '0'; /* next digit */
  67
  68                 d2 = q + 2*d2;
  69                 if ((d2 != 0) || (d3 != 0)) {
  70                         q = (d2 * 0xd) >> 7;
  71                         d2 = d2 - 10*q;
  72                         *buf++ = d2 + '0'; /* next digit */
  73
  74                         d3 = q + 4*d3;
  75                         if (d3 != 0) {
  76                                 q = (d3 * 0xcd) >> 11;
  77                                 d3 = d3 - 10*q;
  78                                 *buf++ = d3 + '0';  /* next digit */
  79                                 if (q != 0)
  80                                         *buf++ = q + '0'; /* most sign. digit */
  81                         }
  82                 }
  83         }
  84         return buf;
  85 }
  86 /* Same with if's removed. Always emits five digits */
  87 static char *put_dec_full(char *buf, unsigned q)
  88 {
  89         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  90         /* but anyway, gcc produces better code with full-sized ints */
  91         unsigned d3, d2, d1, d0;
  92         d1 = (q>>4) & 0xf;
  93         d2 = (q>>8) & 0xf;
  94         d3 = (q>>12);
  95
  96         /*
  97          * Possible ways to approx. divide by 10
  98          * gcc -O2 replaces multiply with shifts and adds
  99          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 100          * (x * 0x67) >> 10:  1100111
 101          * (x * 0x34) >> 9:    110100 - same
 102          * (x * 0x1a) >> 8:     11010 - same
 103          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 104          */
 105
 106         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 107         q = (d0 * 0xcd) >> 11;
 108         d0 = d0 - 10*q;
 109         *buf++ = d0 + '0';
 110         d1 = q + 9*d3 + 5*d2 + d1;
 111                 q = (d1 * 0xcd) >> 11;
 112                 d1 = d1 - 10*q;
 113                 *buf++ = d1 + '0';
 114
 115                 d2 = q + 2*d2;
 116                         q = (d2 * 0xd) >> 7;
 117                         d2 = d2 - 10*q;
 118                         *buf++ = d2 + '0';
 119
 120                         d3 = q + 4*d3;
 121                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 122                                 /* q = (d3 * 0x67) >> 10; - would also work */
 123                                 d3 = d3 - 10*q;
 124                                 *buf++ = d3 + '0';
 125                                         *buf++ = q + '0';
 126         return buf;
 127 }
 128 /* No inlining helps gcc to use registers better */
 129 static noinline char *put_dec(char *buf, uint64_t num)
 130 {
 131         while (1) {
 132                 unsigned rem;
 133                 if (num < 100000)
 134                         return put_dec_trunc(buf, num);
 135                 rem = do_div(num, 100000);
 136                 buf = put_dec_full(buf, rem);
 137         }
 138 }
 139
 140 #define ZEROPAD 1               /* pad with zero */
 141 #define SIGN    2               /* unsigned/signed long */
 142 #define PLUS    4               /* show plus */
 143 #define SPACE   8               /* space if plus */
 144 #define LEFT    16              /* left justified */
 145 #define SMALL   32              /* Must be 32 == 0x20 */
 146 #define SPECIAL 64              /* 0x */
 147
 148 /*
 149  * Macro to add a new character to our output string, but only if it will
 150  * fit. The macro moves to the next character position in the output string.
 151  */
 152 #define ADDCH(str, ch) do { \
 153         if ((str) < end) \
 154                 *(str) = (ch); \
 155         ++str; \
 156         } while (0)
 157
 158 static char *number(char *buf, char *end, u64 num,
 159                 int base, int size, int precision, int type)
 160 {
 161         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 162         static const char digits[16] = "0123456789ABCDEF";
 163
 164         char tmp[66];
 165         char sign;
 166         char locase;
 167         int need_pfx = ((type & SPECIAL) && base != 10);
 168         int i;
 169
 170         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 171          * produces same digits or (maybe lowercased) letters */
 172         locase = (type & SMALL);
 173         if (type & LEFT)
 174                 type &= ~ZEROPAD;
 175         sign = 0;
 176         if (type & SIGN) {
 177                 if ((s64) num < 0) {
 178                         sign = '-';
 179                         num = -(s64) num;
 180                         size--;
 181                 } else if (type & PLUS) {
 182                         sign = '+';
 183                         size--;
 184                 } else if (type & SPACE) {
 185                         sign = ' ';
 186                         size--;
 187                 }
 188         }
 189         if (need_pfx) {
 190                 size--;
 191                 if (base == 16)
 192                         size--;
 193         }
 194
 195         /* generate full string in tmp[], in reverse order */
 196         i = 0;
 197         if (num == 0)
 198                 tmp[i++] = '0';
 199         /* Generic code, for any base:
 200         else do {
 201                 tmp[i++] = (digits[do_div(num,base)] | locase);
 202         } while (num != 0);
 203         */
 204         else if (base != 10) { /* 8 or 16 */
 205                 int mask = base - 1;
 206                 int shift = 3;
 207
 208                 if (base == 16)
 209                         shift = 4;
 210
 211                 do {
 212                         tmp[i++] = (digits[((unsigned char)num) & mask]
 213                                         | locase);
 214                         num >>= shift;
 215                 } while (num);
 216         } else { /* base 10 */
 217                 i = put_dec(tmp, num) - tmp;
 218         }
 219
 220         /* printing 100 using %2d gives "100", not "00" */
 221         if (i > precision)
 222                 precision = i;
 223         /* leading space padding */
 224         size -= precision;
 225         if (!(type & (ZEROPAD + LEFT))) {
 226                 while (--size >= 0)
 227                         ADDCH(buf, ' ');
 228         }
 229         /* sign */
 230         if (sign)
 231                 ADDCH(buf, sign);
 232         /* "0x" / "0" prefix */
 233         if (need_pfx) {
 234                 ADDCH(buf, '0');
 235                 if (base == 16)
 236                         ADDCH(buf, 'X' | locase);
 237         }
 238         /* zero or space padding */
 239         if (!(type & LEFT)) {
 240                 char c = (type & ZEROPAD) ? '0' : ' ';
 241
 242                 while (--size >= 0)
 243                         ADDCH(buf, c);
 244         }
 245         /* hmm even more zero padding? */
 246         while (i <= --precision)
 247                 ADDCH(buf, '0');
 248         /* actual digits of result */
 249         while (--i >= 0)
 250                 ADDCH(buf, tmp[i]);
 251         /* trailing space padding */
 252         while (--size >= 0)
 253                 ADDCH(buf, ' ');
 254         return buf;
 255 }
 256
 257 static char *string(char *buf, char *end, char *s, int field_width,
 258                 int precision, int flags)
 259 {
 260         int len, i;
 261
 262         if (s == NULL)
 263                 s = "<NULL>";
 264
 265         len = strnlen(s, precision);
 266
 267         if (!(flags & LEFT))
 268                 while (len < field_width--)
 269                         ADDCH(buf, ' ');
 270         for (i = 0; i < len; ++i)
 271                 ADDCH(buf, *s++);
 272         while (len < field_width--)
 273                 ADDCH(buf, ' ');
 274         return buf;
 275 }
 276
 277 /* U-Boot uses UTF-16 strings in the EFI context only. */
 278 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 279 static char *string16(char *buf, char *end, u16 *s, int field_width,
 280                 int precision, int flags)
 281 {
 282         u16 *str = s ? s : L"<NULL>";
 283         ssize_t len = utf16_strnlen(str, precision);
 284
 285         if (!(flags & LEFT))
 286                 for (; len < field_width; --field_width)
 287                         ADDCH(buf, ' ');
 288         utf16_utf8_strncpy(&buf, str, len);
 289         for (; len < field_width; --field_width)
 290                 ADDCH(buf, ' ');
 291         return buf;
 292 }
 293
 294 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 295                                 int precision, int flags)
 296 {
 297         u16 *str;
 298
 299         /* If dp == NULL output the string '<NULL>' */
 300         if (!dp)
 301                 return string16(buf, end, dp, field_width, precision, flags);
 302
 303         str = efi_dp_str((struct efi_device_path *)dp);
 304         if (!str)
 305                 return ERR_PTR(-ENOMEM);
 306
 307         buf = string16(buf, end, str, field_width, precision, flags);
 308         efi_free_pool(str);
 309         return buf;
 310 }
 311 #endif
 312
 313 #ifdef CONFIG_CMD_NET
 314 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 315                                 int precision, int flags)
 316 {
 317         /* (6 * 2 hex digits), 5 colons and trailing zero */
 318         char mac_addr[6 * 3];
 319         char *p = mac_addr;
 320         int i;
 321
 322         for (i = 0; i < 6; i++) {
 323                 p = hex_byte_pack(p, addr[i]);
 324                 if (!(flags & SPECIAL) && i != 5)
 325                         *p++ = ':';
 326         }
 327         *p = '\0';
 328
 329         return string(buf, end, mac_addr, field_width, precision,
 330                       flags & ~SPECIAL);
 331 }
 332
 333 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 334                          int precision, int flags)
 335 {
 336         /* (8 * 4 hex digits), 7 colons and trailing zero */
 337         char ip6_addr[8 * 5];
 338         char *p = ip6_addr;
 339         int i;
 340
 341         for (i = 0; i < 8; i++) {
 342                 p = hex_byte_pack(p, addr[2 * i]);
 343                 p = hex_byte_pack(p, addr[2 * i + 1]);
 344                 if (!(flags & SPECIAL) && i != 7)
 345                         *p++ = ':';
 346         }
 347         *p = '\0';
 348
 349         return string(buf, end, ip6_addr, field_width, precision,
 350                       flags & ~SPECIAL);
 351 }
 352
 353 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 354                          int precision, int flags)
 355 {
 356         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 357         char ip4_addr[4 * 4];
 358         char temp[3];   /* hold each IP quad in reverse order */
 359         char *p = ip4_addr;
 360         int i, digits;
 361
 362         for (i = 0; i < 4; i++) {
 363                 digits = put_dec_trunc(temp, addr[i]) - temp;
 364                 /* reverse the digits in the quad */
 365                 while (digits--)
 366                         *p++ = temp[digits];
 367                 if (i != 3)
 368                         *p++ = '.';
 369         }
 370         *p = '\0';
 371
 372         return string(buf, end, ip4_addr, field_width, precision,
 373                       flags & ~SPECIAL);
 374 }
 375 #endif
 376
 377 #ifdef CONFIG_LIB_UUID
 378 /*
 379  * This works (roughly) the same way as linux's, but we currently always
 380  * print lower-case (ie. we just keep %pUB and %pUL for compat with linux),
 381  * mostly just because that is what uuid_bin_to_str() supports.
 382  *
 383  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 384  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 385  */
 386 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 387                          int precision, int flags, const char *fmt)
 388 {
 389         char uuid[UUID_STR_LEN + 1];
 390         int str_format = UUID_STR_FORMAT_STD;
 391
 392         switch (*(++fmt)) {
 393         case 'L':
 394         case 'l':
 395                 str_format = UUID_STR_FORMAT_GUID;
 396                 break;
 397         case 'B':
 398         case 'b':
 399                 /* this is the default */
 400                 break;
 401         default:
 402                 break;
 403         }
 404
 405         if (addr)
 406                 uuid_bin_to_str(addr, uuid, str_format);
 407         else
 408                 strcpy(uuid, "<NULL>");
 409
 410         return string(buf, end, uuid, field_width, precision, flags);
 411 }
 412 #endif
 413
 414 /*
 415  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 416  * by an extra set of alphanumeric characters that are extended format
 417  * specifiers.
 418  *
 419  * Right now we handle:
 420  *
 421  * - 'M' For a 6-byte MAC address, it prints the address in the
 422  *       usual colon-separated hex notation
 423  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 424  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 425  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 426  *       currently the same
 427  *
 428  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 429  * function pointers are really function descriptors, which contain a
 430  * pointer to the real address.
 431  */
 432 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 433                 int field_width, int precision, int flags)
 434 {
 435         u64 num = (uintptr_t)ptr;
 436
 437         /*
 438          * Being a boot loader, we explicitly allow pointers to
 439          * (physical) address null.
 440          */
 441 #if 0
 442         if (!ptr)
 443                 return string(buf, end, "(null)", field_width, precision,
 444                               flags);
 445 #endif
 446
 447         switch (*fmt) {
 448 /* Device paths only exist in the EFI context. */
 449 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 450         case 'D':
 451                 return device_path_string(buf, end, ptr, field_width,
 452                                           precision, flags);
 453 #endif
 454 #ifdef CONFIG_CMD_NET
 455         case 'a':
 456                 flags |= SPECIAL | ZEROPAD;
 457
 458                 switch (fmt[1]) {
 459                 case 'p':
 460                 default:
 461                         field_width = sizeof(phys_addr_t) * 2 + 2;
 462                         num = *(phys_addr_t *)ptr;
 463                         break;
 464                 }
 465                 break;
 466         case 'm':
 467                 flags |= SPECIAL;
 468                 /* Fallthrough */
 469         case 'M':
 470                 return mac_address_string(buf, end, ptr, field_width,
 471                                           precision, flags);
 472         case 'i':
 473                 flags |= SPECIAL;
 474                 /* Fallthrough */
 475         case 'I':
 476                 if (fmt[1] == '6')
 477                         return ip6_addr_string(buf, end, ptr, field_width,
 478                                                precision, flags);
 479                 if (fmt[1] == '4')
 480                         return ip4_addr_string(buf, end, ptr, field_width,
 481                                                precision, flags);
 482                 flags &= ~SPECIAL;
 483                 break;
 484 #endif
 485 #ifdef CONFIG_LIB_UUID
 486         case 'U':
 487                 return uuid_string(buf, end, ptr, field_width, precision,
 488                                    flags, fmt);
 489 #endif
 490         default:
 491                 break;
 492         }
 493         flags |= SMALL;
 494         if (field_width == -1) {
 495                 field_width = 2*sizeof(void *);
 496                 flags |= ZEROPAD;
 497         }
 498         return number(buf, end, num, 16, field_width, precision, flags);
 499 }
 500
 501 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 502                               va_list args)
 503 {
 504         u64 num;
 505         int base;
 506         char *str;
 507
 508         int flags;              /* flags to number() */
 509
 510         int field_width;        /* width of output field */
 511         int precision;          /* min. # of digits for integers; max
 512                                    number of chars for from string */
 513         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 514                                 /* 'z' support added 23/7/1999 S.H.    */
 515                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 516                                 /* 't' added for ptrdiff_t */
 517         char *end = buf + size;
 518
 519         /* Make sure end is always >= buf - do we want this in U-Boot? */
 520         if (end < buf) {
 521                 end = ((void *)-1);
 522                 size = end - buf;
 523         }
 524         str = buf;
 525
 526         for (; *fmt ; ++fmt) {
 527                 if (*fmt != '%') {
 528                         ADDCH(str, *fmt);
 529                         continue;
 530                 }
 531
 532                 /* process flags */
 533                 flags = 0;
 534 repeat:
 535                         ++fmt;          /* this also skips first '%' */
 536                         switch (*fmt) {
 537                         case '-':
 538                                 flags |= LEFT;
 539                                 goto repeat;
 540                         case '+':
 541                                 flags |= PLUS;
 542                                 goto repeat;
 543                         case ' ':
 544                                 flags |= SPACE;
 545                                 goto repeat;
 546                         case '#':
 547                                 flags |= SPECIAL;
 548                                 goto repeat;
 549                         case '0':
 550                                 flags |= ZEROPAD;
 551                                 goto repeat;
 552                         }
 553
 554                 /* get field width */
 555                 field_width = -1;
 556                 if (is_digit(*fmt))
 557                         field_width = skip_atoi(&fmt);
 558                 else if (*fmt == '*') {
 559                         ++fmt;
 560                         /* it's the next argument */
 561                         field_width = va_arg(args, int);
 562                         if (field_width < 0) {
 563                                 field_width = -field_width;
 564                                 flags |= LEFT;
 565                         }
 566                 }
 567
 568                 /* get the precision */
 569                 precision = -1;
 570                 if (*fmt == '.') {
 571                         ++fmt;
 572                         if (is_digit(*fmt))
 573                                 precision = skip_atoi(&fmt);
 574                         else if (*fmt == '*') {
 575                                 ++fmt;
 576                                 /* it's the next argument */
 577                                 precision = va_arg(args, int);
 578                         }
 579                         if (precision < 0)
 580                                 precision = 0;
 581                 }
 582
 583                 /* get the conversion qualifier */
 584                 qualifier = -1;
 585                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 586                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 587                         qualifier = *fmt;
 588                         ++fmt;
 589                         if (qualifier == 'l' && *fmt == 'l') {
 590                                 qualifier = 'L';
 591                                 ++fmt;
 592                         }
 593                 }
 594
 595                 /* default base */
 596                 base = 10;
 597
 598                 switch (*fmt) {
 599                 case 'c':
 600                         if (!(flags & LEFT)) {
 601                                 while (--field_width > 0)
 602                                         ADDCH(str, ' ');
 603                         }
 604                         ADDCH(str, (unsigned char) va_arg(args, int));
 605                         while (--field_width > 0)
 606                                 ADDCH(str, ' ');
 607                         continue;
 608
 609                 case 's':
 610 /* U-Boot uses UTF-16 strings in the EFI context only. */
 611 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 612                         if (qualifier == 'l') {
 613                                 str = string16(str, end, va_arg(args, u16 *),
 614                                                field_width, precision, flags);
 615                         } else
 616 #endif
 617                         {
 618                                 str = string(str, end, va_arg(args, char *),
 619                                              field_width, precision, flags);
 620                         }
 621                         continue;
 622
 623                 case 'p':
 624                         str = pointer(fmt + 1, str, end,
 625                                         va_arg(args, void *),
 626                                         field_width, precision, flags);
 627                         if (IS_ERR(str))
 628                                 return PTR_ERR(str);
 629                         /* Skip all alphanumeric pointer suffixes */
 630                         while (isalnum(fmt[1]))
 631                                 fmt++;
 632                         continue;
 633
 634                 case 'n':
 635                         if (qualifier == 'l') {
 636                                 long *ip = va_arg(args, long *);
 637                                 *ip = (str - buf);
 638                         } else {
 639                                 int *ip = va_arg(args, int *);
 640                                 *ip = (str - buf);
 641                         }
 642                         continue;
 643
 644                 case '%':
 645                         ADDCH(str, '%');
 646                         continue;
 647
 648                 /* integer number formats - set up the flags and "break" */
 649                 case 'o':
 650                         base = 8;
 651                         break;
 652
 653                 case 'x':
 654                         flags |= SMALL;
 655                 case 'X':
 656                         base = 16;
 657                         break;
 658
 659                 case 'd':
 660                 case 'i':
 661                         flags |= SIGN;
 662                 case 'u':
 663                         break;
 664
 665                 default:
 666                         ADDCH(str, '%');
 667                         if (*fmt)
 668                                 ADDCH(str, *fmt);
 669                         else
 670                                 --fmt;
 671                         continue;
 672                 }
 673                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 674                         num = va_arg(args, unsigned long long);
 675                 else if (qualifier == 'l') {
 676                         num = va_arg(args, unsigned long);
 677                         if (flags & SIGN)
 678                                 num = (signed long) num;
 679                 } else if (qualifier == 'Z' || qualifier == 'z') {
 680                         num = va_arg(args, size_t);
 681                 } else if (qualifier == 't') {
 682                         num = va_arg(args, ptrdiff_t);
 683                 } else if (qualifier == 'h') {
 684                         num = (unsigned short) va_arg(args, int);
 685                         if (flags & SIGN)
 686                                 num = (signed short) num;
 687                 } else {
 688                         num = va_arg(args, unsigned int);
 689                         if (flags & SIGN)
 690                                 num = (signed int) num;
 691                 }
 692                 str = number(str, end, num, base, field_width, precision,
 693                              flags);
 694         }
 695
 696         if (size > 0) {
 697                 ADDCH(str, '\0');
 698                 if (str > end)
 699                         end[-1] = '\0';
 700                 --str;
 701         }
 702         /* the trailing null byte doesn't count towards the total */
 703         return str - buf;
 704 }
 705
 706 int vsnprintf(char *buf, size_t size, const char *fmt,
 707                               va_list args)
 708 {
 709         return vsnprintf_internal(buf, size, fmt, args);
 710 }
 711
 712 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 713 {
 714         int i;
 715
 716         i = vsnprintf(buf, size, fmt, args);
 717
 718         if (likely(i < size))
 719                 return i;
 720         if (size != 0)
 721                 return size - 1;
 722         return 0;
 723 }
 724
 725 int snprintf(char *buf, size_t size, const char *fmt, ...)
 726 {
 727         va_list args;
 728         int i;
 729
 730         va_start(args, fmt);
 731         i = vsnprintf(buf, size, fmt, args);
 732         va_end(args);
 733
 734         return i;
 735 }
 736
 737 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 738 {
 739         va_list args;
 740         int i;
 741
 742         va_start(args, fmt);
 743         i = vscnprintf(buf, size, fmt, args);
 744         va_end(args);
 745
 746         return i;
 747 }
 748
 749 /**
 750  * Format a string and place it in a buffer (va_list version)
 751  *
 752  * @param buf   The buffer to place the result into
 753  * @param fmt   The format string to use
 754  * @param args  Arguments for the format string
 755  *
 756  * The function returns the number of characters written
 757  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 758  * buffer overflows.
 759  *
 760  * If you're not already dealing with a va_list consider using sprintf().
 761  */
 762 int vsprintf(char *buf, const char *fmt, va_list args)
 763 {
 764         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 765 }
 766
 767 int sprintf(char *buf, const char *fmt, ...)
 768 {
 769         va_list args;
 770         int i;
 771
 772         va_start(args, fmt);
 773         i = vsprintf(buf, fmt, args);
 774         va_end(args);
 775         return i;
 776 }
 777
 778 #if CONFIG_IS_ENABLED(PRINTF)
 779 int printf(const char *fmt, ...)
 780 {
 781         va_list args;
 782         uint i;
 783         char printbuffer[CONFIG_SYS_PBSIZE];
 784
 785         va_start(args, fmt);
 786
 787         /*
 788          * For this to work, printbuffer must be larger than
 789          * anything we ever want to print.
 790          */
 791         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 792         va_end(args);
 793
 794         /* Handle error */
 795         if (i <= 0)
 796                 return i;
 797         /* Print the string */
 798         puts(printbuffer);
 799         return i;
 800 }
 801
 802 int vprintf(const char *fmt, va_list args)
 803 {
 804         uint i;
 805         char printbuffer[CONFIG_SYS_PBSIZE];
 806
 807         /*
 808          * For this to work, printbuffer must be larger than
 809          * anything we ever want to print.
 810          */
 811         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 812
 813         /* Handle error */
 814         if (i <= 0)
 815                 return i;
 816         /* Print the string */
 817         puts(printbuffer);
 818         return i;
 819 }
 820 #endif
 821
 822 char *simple_itoa(ulong i)
 823 {
 824         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 825         static char local[22];
 826         char *p = &local[21];
 827
 828         *p-- = '\0';
 829         do {
 830                 *p-- = '0' + i % 10;
 831                 i /= 10;
 832         } while (i > 0);
 833         return p + 1;
 834 }
 835
 836 /* We don't seem to have %'d in U-Boot */
 837 void print_grouped_ull(unsigned long long int_val, int digits)
 838 {
 839         char str[21], *s;
 840         int grab = 3;
 841
 842         digits = (digits + 2) / 3;
 843         sprintf(str, "%*llu", digits * 3, int_val);
 844         for (s = str; *s; s += grab) {
 845                 if (s != str)
 846                         putc(s[-1] != ' ' ? ',' : ' ');
 847                 printf("%.*s", grab, s);
 848                 grab = 3;
 849         }
 850 }
 851
 852 bool str2off(const char *p, loff_t *num)
 853 {
 854         char *endptr;
 855
 856         *num = simple_strtoull(p, &endptr, 16);
 857         return *p != '\0' && *endptr == '\0';
 858 }
 859
 860 bool str2long(const char *p, ulong *num)
 861 {
 862         char *endptr;
 863
 864         *num = simple_strtoul(p, &endptr, 16);
 865         return *p != '\0' && *endptr == '\0';
 866 }