lib/vsprintf.c

   1 /*
   2  *  linux/lib/vsprintf.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  * (C) Copyright 2000-2009
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  */
   8
   9 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
  10 /*
  11  * Wirzenius wrote this portably, Torvalds fucked it up :-)
  12  *
  13  * from hush: simple_itoa() was lifted from boa-0.93.15
  14  */
  15
  16 #include <common.h>
  17 #include <charset.h>
  18 #include <efi_loader.h>
  19 #include <div64.h>
  20 #include <hexdump.h>
  21 #include <stdarg.h>
  22 #include <uuid.h>
  23 #include <vsprintf.h>
  24 #include <linux/ctype.h>
  25 #include <linux/err.h>
  26 #include <linux/types.h>
  27 #include <linux/string.h>
  28
  29 /* we use this so that we can do without the ctype library */
  30 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
  31
  32 static int skip_atoi(const char **s)
  33 {
  34         int i = 0;
  35
  36         while (is_digit(**s))
  37                 i = i * 10 + *((*s)++) - '0';
  38
  39         return i;
  40 }
  41
  42 /* Decimal conversion is by far the most typical, and is used
  43  * for /proc and /sys data. This directly impacts e.g. top performance
  44  * with many processes running. We optimize it for speed
  45  * using code from
  46  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
  47  * (with permission from the author, Douglas W. Jones). */
  48
  49 /* Formats correctly any integer in [0,99999].
  50  * Outputs from one to five digits depending on input.
  51  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
  52 static char *put_dec_trunc(char *buf, unsigned q)
  53 {
  54         unsigned d3, d2, d1, d0;
  55         d1 = (q>>4) & 0xf;
  56         d2 = (q>>8) & 0xf;
  57         d3 = (q>>12);
  58
  59         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
  60         q = (d0 * 0xcd) >> 11;
  61         d0 = d0 - 10*q;
  62         *buf++ = d0 + '0'; /* least significant digit */
  63         d1 = q + 9*d3 + 5*d2 + d1;
  64         if (d1 != 0) {
  65                 q = (d1 * 0xcd) >> 11;
  66                 d1 = d1 - 10*q;
  67                 *buf++ = d1 + '0'; /* next digit */
  68
  69                 d2 = q + 2*d2;
  70                 if ((d2 != 0) || (d3 != 0)) {
  71                         q = (d2 * 0xd) >> 7;
  72                         d2 = d2 - 10*q;
  73                         *buf++ = d2 + '0'; /* next digit */
  74
  75                         d3 = q + 4*d3;
  76                         if (d3 != 0) {
  77                                 q = (d3 * 0xcd) >> 11;
  78                                 d3 = d3 - 10*q;
  79                                 *buf++ = d3 + '0';  /* next digit */
  80                                 if (q != 0)
  81                                         *buf++ = q + '0'; /* most sign. digit */
  82                         }
  83                 }
  84         }
  85         return buf;
  86 }
  87 /* Same with if's removed. Always emits five digits */
  88 static char *put_dec_full(char *buf, unsigned q)
  89 {
  90         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
  91         /* but anyway, gcc produces better code with full-sized ints */
  92         unsigned d3, d2, d1, d0;
  93         d1 = (q>>4) & 0xf;
  94         d2 = (q>>8) & 0xf;
  95         d3 = (q>>12);
  96
  97         /*
  98          * Possible ways to approx. divide by 10
  99          * gcc -O2 replaces multiply with shifts and adds
 100          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 101          * (x * 0x67) >> 10:  1100111
 102          * (x * 0x34) >> 9:    110100 - same
 103          * (x * 0x1a) >> 8:     11010 - same
 104          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 105          */
 106
 107         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 108         q = (d0 * 0xcd) >> 11;
 109         d0 = d0 - 10*q;
 110         *buf++ = d0 + '0';
 111         d1 = q + 9*d3 + 5*d2 + d1;
 112                 q = (d1 * 0xcd) >> 11;
 113                 d1 = d1 - 10*q;
 114                 *buf++ = d1 + '0';
 115
 116                 d2 = q + 2*d2;
 117                         q = (d2 * 0xd) >> 7;
 118                         d2 = d2 - 10*q;
 119                         *buf++ = d2 + '0';
 120
 121                         d3 = q + 4*d3;
 122                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 123                                 /* q = (d3 * 0x67) >> 10; - would also work */
 124                                 d3 = d3 - 10*q;
 125                                 *buf++ = d3 + '0';
 126                                         *buf++ = q + '0';
 127         return buf;
 128 }
 129 /* No inlining helps gcc to use registers better */
 130 static noinline char *put_dec(char *buf, uint64_t num)
 131 {
 132         while (1) {
 133                 unsigned rem;
 134                 if (num < 100000)
 135                         return put_dec_trunc(buf, num);
 136                 rem = do_div(num, 100000);
 137                 buf = put_dec_full(buf, rem);
 138         }
 139 }
 140
 141 #define ZEROPAD 1               /* pad with zero */
 142 #define SIGN    2               /* unsigned/signed long */
 143 #define PLUS    4               /* show plus */
 144 #define SPACE   8               /* space if plus */
 145 #define LEFT    16              /* left justified */
 146 #define SMALL   32              /* Must be 32 == 0x20 */
 147 #define SPECIAL 64              /* 0x */
 148
 149 /*
 150  * Macro to add a new character to our output string, but only if it will
 151  * fit. The macro moves to the next character position in the output string.
 152  */
 153 #define ADDCH(str, ch) do { \
 154         if ((str) < end) \
 155                 *(str) = (ch); \
 156         ++str; \
 157         } while (0)
 158
 159 static char *number(char *buf, char *end, u64 num,
 160                 int base, int size, int precision, int type)
 161 {
 162         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 163         static const char digits[16] = "0123456789ABCDEF";
 164
 165         char tmp[66];
 166         char sign;
 167         char locase;
 168         int need_pfx = ((type & SPECIAL) && base != 10);
 169         int i;
 170
 171         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 172          * produces same digits or (maybe lowercased) letters */
 173         locase = (type & SMALL);
 174         if (type & LEFT)
 175                 type &= ~ZEROPAD;
 176         sign = 0;
 177         if (type & SIGN) {
 178                 if ((s64) num < 0) {
 179                         sign = '-';
 180                         num = -(s64) num;
 181                         size--;
 182                 } else if (type & PLUS) {
 183                         sign = '+';
 184                         size--;
 185                 } else if (type & SPACE) {
 186                         sign = ' ';
 187                         size--;
 188                 }
 189         }
 190         if (need_pfx) {
 191                 size--;
 192                 if (base == 16)
 193                         size--;
 194         }
 195
 196         /* generate full string in tmp[], in reverse order */
 197         i = 0;
 198         if (num == 0)
 199                 tmp[i++] = '0';
 200         /* Generic code, for any base:
 201         else do {
 202                 tmp[i++] = (digits[do_div(num,base)] | locase);
 203         } while (num != 0);
 204         */
 205         else if (base != 10) { /* 8 or 16 */
 206                 int mask = base - 1;
 207                 int shift = 3;
 208
 209                 if (base == 16)
 210                         shift = 4;
 211
 212                 do {
 213                         tmp[i++] = (digits[((unsigned char)num) & mask]
 214                                         | locase);
 215                         num >>= shift;
 216                 } while (num);
 217         } else { /* base 10 */
 218                 i = put_dec(tmp, num) - tmp;
 219         }
 220
 221         /* printing 100 using %2d gives "100", not "00" */
 222         if (i > precision)
 223                 precision = i;
 224         /* leading space padding */
 225         size -= precision;
 226         if (!(type & (ZEROPAD + LEFT))) {
 227                 while (--size >= 0)
 228                         ADDCH(buf, ' ');
 229         }
 230         /* sign */
 231         if (sign)
 232                 ADDCH(buf, sign);
 233         /* "0x" / "0" prefix */
 234         if (need_pfx) {
 235                 ADDCH(buf, '0');
 236                 if (base == 16)
 237                         ADDCH(buf, 'X' | locase);
 238         }
 239         /* zero or space padding */
 240         if (!(type & LEFT)) {
 241                 char c = (type & ZEROPAD) ? '0' : ' ';
 242
 243                 while (--size >= 0)
 244                         ADDCH(buf, c);
 245         }
 246         /* hmm even more zero padding? */
 247         while (i <= --precision)
 248                 ADDCH(buf, '0');
 249         /* actual digits of result */
 250         while (--i >= 0)
 251                 ADDCH(buf, tmp[i]);
 252         /* trailing space padding */
 253         while (--size >= 0)
 254                 ADDCH(buf, ' ');
 255         return buf;
 256 }
 257
 258 static char *string(char *buf, char *end, char *s, int field_width,
 259                 int precision, int flags)
 260 {
 261         int len, i;
 262
 263         if (s == NULL)
 264                 s = "<NULL>";
 265
 266         len = strnlen(s, precision);
 267
 268         if (!(flags & LEFT))
 269                 while (len < field_width--)
 270                         ADDCH(buf, ' ');
 271         for (i = 0; i < len; ++i)
 272                 ADDCH(buf, *s++);
 273         while (len < field_width--)
 274                 ADDCH(buf, ' ');
 275         return buf;
 276 }
 277
 278 /* U-Boot uses UTF-16 strings in the EFI context only. */
 279 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 280 static char *string16(char *buf, char *end, u16 *s, int field_width,
 281                 int precision, int flags)
 282 {
 283         const u16 *str = s ? s : L"<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         for (i = 0; i < len && buf + utf16_utf8_strnlen(str, 1) <= end; ++i) {
 290                 s32 s = utf16_get(&str);
 291
 292                 if (s < 0)
 293                         s = '?';
 294                 utf8_put(s, &buf);
 295         }
 296         for (; len < field_width; --field_width)
 297                 ADDCH(buf, ' ');
 298         return buf;
 299 }
 300
 301 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT)
 302 static char *device_path_string(char *buf, char *end, void *dp, int field_width,
 303                                 int precision, int flags)
 304 {
 305         u16 *str;
 306
 307         /* If dp == NULL output the string '<NULL>' */
 308         if (!dp)
 309                 return string16(buf, end, dp, field_width, precision, flags);
 310
 311         str = efi_dp_str((struct efi_device_path *)dp);
 312         if (!str)
 313                 return ERR_PTR(-ENOMEM);
 314
 315         buf = string16(buf, end, str, field_width, precision, flags);
 316         efi_free_pool(str);
 317         return buf;
 318 }
 319 #endif
 320 #endif
 321
 322 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 323                                 int precision, int flags)
 324 {
 325         /* (6 * 2 hex digits), 5 colons and trailing zero */
 326         char mac_addr[6 * 3];
 327         char *p = mac_addr;
 328         int i;
 329
 330         for (i = 0; i < 6; i++) {
 331                 p = hex_byte_pack(p, addr[i]);
 332                 if (!(flags & SPECIAL) && i != 5)
 333                         *p++ = ':';
 334         }
 335         *p = '\0';
 336
 337         return string(buf, end, mac_addr, field_width, precision,
 338                       flags & ~SPECIAL);
 339 }
 340
 341 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 342                          int precision, int flags)
 343 {
 344         /* (8 * 4 hex digits), 7 colons and trailing zero */
 345         char ip6_addr[8 * 5];
 346         char *p = ip6_addr;
 347         int i;
 348
 349         for (i = 0; i < 8; i++) {
 350                 p = hex_byte_pack(p, addr[2 * i]);
 351                 p = hex_byte_pack(p, addr[2 * i + 1]);
 352                 if (!(flags & SPECIAL) && i != 7)
 353                         *p++ = ':';
 354         }
 355         *p = '\0';
 356
 357         return string(buf, end, ip6_addr, field_width, precision,
 358                       flags & ~SPECIAL);
 359 }
 360
 361 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 362                          int precision, int flags)
 363 {
 364         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 365         char ip4_addr[4 * 4];
 366         char temp[3];   /* hold each IP quad in reverse order */
 367         char *p = ip4_addr;
 368         int i, digits;
 369
 370         for (i = 0; i < 4; i++) {
 371                 digits = put_dec_trunc(temp, addr[i]) - temp;
 372                 /* reverse the digits in the quad */
 373                 while (digits--)
 374                         *p++ = temp[digits];
 375                 if (i != 3)
 376                         *p++ = '.';
 377         }
 378         *p = '\0';
 379
 380         return string(buf, end, ip4_addr, field_width, precision,
 381                       flags & ~SPECIAL);
 382 }
 383
 384 #ifdef CONFIG_LIB_UUID
 385 /*
 386  * This works (roughly) the same way as Linux's.
 387  *
 388  *   %pUb:   01020304-0506-0708-090a-0b0c0d0e0f10
 389  *   %pUB:   01020304-0506-0708-090A-0B0C0D0E0F10
 390  *   %pUl:   04030201-0605-0807-090a-0b0c0d0e0f10
 391  *   %pUL:   04030201-0605-0807-090A-0B0C0D0E0F10
 392  */
 393 static char *uuid_string(char *buf, char *end, u8 *addr, int field_width,
 394                          int precision, int flags, const char *fmt)
 395 {
 396         char uuid[UUID_STR_LEN + 1];
 397         int str_format;
 398
 399         switch (*(++fmt)) {
 400         case 'L':
 401                 str_format = UUID_STR_FORMAT_GUID | UUID_STR_UPPER_CASE;
 402                 break;
 403         case 'l':
 404                 str_format = UUID_STR_FORMAT_GUID;
 405                 break;
 406         case 'B':
 407                 str_format = UUID_STR_FORMAT_STD | UUID_STR_UPPER_CASE;
 408                 break;
 409         default:
 410                 str_format = UUID_STR_FORMAT_STD;
 411                 break;
 412         }
 413
 414         if (addr)
 415                 uuid_bin_to_str(addr, uuid, str_format);
 416         else
 417                 strcpy(uuid, "<NULL>");
 418
 419         return string(buf, end, uuid, field_width, precision, flags);
 420 }
 421 #endif
 422
 423 /*
 424  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 425  * by an extra set of alphanumeric characters that are extended format
 426  * specifiers.
 427  *
 428  * Right now we handle:
 429  *
 430  * - 'M' For a 6-byte MAC address, it prints the address in the
 431  *       usual colon-separated hex notation
 432  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 433  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 434  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 435  *       currently the same
 436  *
 437  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 438  * function pointers are really function descriptors, which contain a
 439  * pointer to the real address.
 440  */
 441 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 442                 int field_width, int precision, int flags)
 443 {
 444         u64 num = (uintptr_t)ptr;
 445
 446         /*
 447          * Being a boot loader, we explicitly allow pointers to
 448          * (physical) address null.
 449          */
 450 #if 0
 451         if (!ptr)
 452                 return string(buf, end, "(null)", field_width, precision,
 453                               flags);
 454 #endif
 455
 456         switch (*fmt) {
 457 /* Device paths only exist in the EFI context. */
 458 #if CONFIG_IS_ENABLED(EFI_DEVICE_PATH_TO_TEXT) && !defined(API_BUILD)
 459         case 'D':
 460                 return device_path_string(buf, end, ptr, field_width,
 461                                           precision, flags);
 462 #endif
 463         case 'a':
 464                 flags |= SPECIAL | ZEROPAD;
 465
 466                 switch (fmt[1]) {
 467                 case 'p':
 468                 default:
 469                         field_width = sizeof(phys_addr_t) * 2 + 2;
 470                         num = *(phys_addr_t *)ptr;
 471                         break;
 472                 }
 473                 break;
 474         case 'm':
 475                 flags |= SPECIAL;
 476                 /* Fallthrough */
 477         case 'M':
 478                 return mac_address_string(buf, end, ptr, field_width,
 479                                           precision, flags);
 480         case 'i':
 481                 flags |= SPECIAL;
 482                 /* Fallthrough */
 483         case 'I':
 484                 if (fmt[1] == '6')
 485                         return ip6_addr_string(buf, end, ptr, field_width,
 486                                                precision, flags);
 487                 if (fmt[1] == '4')
 488                         return ip4_addr_string(buf, end, ptr, field_width,
 489                                                precision, flags);
 490                 flags &= ~SPECIAL;
 491                 break;
 492 #ifdef CONFIG_LIB_UUID
 493         case 'U':
 494                 return uuid_string(buf, end, ptr, field_width, precision,
 495                                    flags, fmt);
 496 #endif
 497         default:
 498                 break;
 499         }
 500         flags |= SMALL;
 501         if (field_width == -1) {
 502                 field_width = 2*sizeof(void *);
 503                 flags |= ZEROPAD;
 504         }
 505         return number(buf, end, num, 16, field_width, precision, flags);
 506 }
 507
 508 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 509                               va_list args)
 510 {
 511         u64 num;
 512         int base;
 513         char *str;
 514
 515         int flags;              /* flags to number() */
 516
 517         int field_width;        /* width of output field */
 518         int precision;          /* min. # of digits for integers; max
 519                                    number of chars for from string */
 520         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 521                                 /* 'z' support added 23/7/1999 S.H.    */
 522                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 523                                 /* 't' added for ptrdiff_t */
 524         char *end = buf + size;
 525
 526         /* Make sure end is always >= buf - do we want this in U-Boot? */
 527         if (end < buf) {
 528                 end = ((void *)-1);
 529                 size = end - buf;
 530         }
 531         str = buf;
 532
 533         for (; *fmt ; ++fmt) {
 534                 if (*fmt != '%') {
 535                         ADDCH(str, *fmt);
 536                         continue;
 537                 }
 538
 539                 /* process flags */
 540                 flags = 0;
 541 repeat:
 542                         ++fmt;          /* this also skips first '%' */
 543                         switch (*fmt) {
 544                         case '-':
 545                                 flags |= LEFT;
 546                                 goto repeat;
 547                         case '+':
 548                                 flags |= PLUS;
 549                                 goto repeat;
 550                         case ' ':
 551                                 flags |= SPACE;
 552                                 goto repeat;
 553                         case '#':
 554                                 flags |= SPECIAL;
 555                                 goto repeat;
 556                         case '0':
 557                                 flags |= ZEROPAD;
 558                                 goto repeat;
 559                         }
 560
 561                 /* get field width */
 562                 field_width = -1;
 563                 if (is_digit(*fmt))
 564                         field_width = skip_atoi(&fmt);
 565                 else if (*fmt == '*') {
 566                         ++fmt;
 567                         /* it's the next argument */
 568                         field_width = va_arg(args, int);
 569                         if (field_width < 0) {
 570                                 field_width = -field_width;
 571                                 flags |= LEFT;
 572                         }
 573                 }
 574
 575                 /* get the precision */
 576                 precision = -1;
 577                 if (*fmt == '.') {
 578                         ++fmt;
 579                         if (is_digit(*fmt))
 580                                 precision = skip_atoi(&fmt);
 581                         else if (*fmt == '*') {
 582                                 ++fmt;
 583                                 /* it's the next argument */
 584                                 precision = va_arg(args, int);
 585                         }
 586                         if (precision < 0)
 587                                 precision = 0;
 588                 }
 589
 590                 /* get the conversion qualifier */
 591                 qualifier = -1;
 592                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 593                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 594                         qualifier = *fmt;
 595                         ++fmt;
 596                         if (qualifier == 'l' && *fmt == 'l') {
 597                                 qualifier = 'L';
 598                                 ++fmt;
 599                         }
 600                 }
 601
 602                 /* default base */
 603                 base = 10;
 604
 605                 switch (*fmt) {
 606                 case 'c':
 607                         if (!(flags & LEFT)) {
 608                                 while (--field_width > 0)
 609                                         ADDCH(str, ' ');
 610                         }
 611                         ADDCH(str, (unsigned char) va_arg(args, int));
 612                         while (--field_width > 0)
 613                                 ADDCH(str, ' ');
 614                         continue;
 615
 616                 case 's':
 617 /* U-Boot uses UTF-16 strings in the EFI context only. */
 618 #if CONFIG_IS_ENABLED(EFI_LOADER) && !defined(API_BUILD)
 619                         if (qualifier == 'l') {
 620                                 str = string16(str, end, va_arg(args, u16 *),
 621                                                field_width, precision, flags);
 622                         } else
 623 #endif
 624                         {
 625                                 str = string(str, end, va_arg(args, char *),
 626                                              field_width, precision, flags);
 627                         }
 628                         continue;
 629
 630                 case 'p':
 631                         str = pointer(fmt + 1, str, end,
 632                                         va_arg(args, void *),
 633                                         field_width, precision, flags);
 634                         if (IS_ERR(str))
 635                                 return PTR_ERR(str);
 636                         /* Skip all alphanumeric pointer suffixes */
 637                         while (isalnum(fmt[1]))
 638                                 fmt++;
 639                         continue;
 640
 641                 case 'n':
 642                         if (qualifier == 'l') {
 643                                 long *ip = va_arg(args, long *);
 644                                 *ip = (str - buf);
 645                         } else {
 646                                 int *ip = va_arg(args, int *);
 647                                 *ip = (str - buf);
 648                         }
 649                         continue;
 650
 651                 case '%':
 652                         ADDCH(str, '%');
 653                         continue;
 654
 655                 /* integer number formats - set up the flags and "break" */
 656                 case 'o':
 657                         base = 8;
 658                         break;
 659
 660                 case 'x':
 661                         flags |= SMALL;
 662                 case 'X':
 663                         base = 16;
 664                         break;
 665
 666                 case 'd':
 667                 case 'i':
 668                         flags |= SIGN;
 669                 case 'u':
 670                         break;
 671
 672                 default:
 673                         ADDCH(str, '%');
 674                         if (*fmt)
 675                                 ADDCH(str, *fmt);
 676                         else
 677                                 --fmt;
 678                         continue;
 679                 }
 680                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 681                         num = va_arg(args, unsigned long long);
 682                 else if (qualifier == 'l') {
 683                         num = va_arg(args, unsigned long);
 684                         if (flags & SIGN)
 685                                 num = (signed long) num;
 686                 } else if (qualifier == 'Z' || qualifier == 'z') {
 687                         num = va_arg(args, size_t);
 688                 } else if (qualifier == 't') {
 689                         num = va_arg(args, ptrdiff_t);
 690                 } else if (qualifier == 'h') {
 691                         num = (unsigned short) va_arg(args, int);
 692                         if (flags & SIGN)
 693                                 num = (signed short) num;
 694                 } else {
 695                         num = va_arg(args, unsigned int);
 696                         if (flags & SIGN)
 697                                 num = (signed int) num;
 698                 }
 699                 str = number(str, end, num, base, field_width, precision,
 700                              flags);
 701         }
 702
 703         if (size > 0) {
 704                 ADDCH(str, '\0');
 705                 if (str > end)
 706                         end[-1] = '\0';
 707                 --str;
 708         }
 709         /* the trailing null byte doesn't count towards the total */
 710         return str - buf;
 711 }
 712
 713 int vsnprintf(char *buf, size_t size, const char *fmt,
 714                               va_list args)
 715 {
 716         return vsnprintf_internal(buf, size, fmt, args);
 717 }
 718
 719 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 720 {
 721         int i;
 722
 723         i = vsnprintf(buf, size, fmt, args);
 724
 725         if (likely(i < size))
 726                 return i;
 727         if (size != 0)
 728                 return size - 1;
 729         return 0;
 730 }
 731
 732 int snprintf(char *buf, size_t size, const char *fmt, ...)
 733 {
 734         va_list args;
 735         int i;
 736
 737         va_start(args, fmt);
 738         i = vsnprintf(buf, size, fmt, args);
 739         va_end(args);
 740
 741         return i;
 742 }
 743
 744 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 745 {
 746         va_list args;
 747         int i;
 748
 749         va_start(args, fmt);
 750         i = vscnprintf(buf, size, fmt, args);
 751         va_end(args);
 752
 753         return i;
 754 }
 755
 756 /**
 757  * Format a string and place it in a buffer (va_list version)
 758  *
 759  * @param buf   The buffer to place the result into
 760  * @param fmt   The format string to use
 761  * @param args  Arguments for the format string
 762  *
 763  * The function returns the number of characters written
 764  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 765  * buffer overflows.
 766  *
 767  * If you're not already dealing with a va_list consider using sprintf().
 768  */
 769 int vsprintf(char *buf, const char *fmt, va_list args)
 770 {
 771         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 772 }
 773
 774 int sprintf(char *buf, const char *fmt, ...)
 775 {
 776         va_list args;
 777         int i;
 778
 779         va_start(args, fmt);
 780         i = vsprintf(buf, fmt, args);
 781         va_end(args);
 782         return i;
 783 }
 784
 785 #if CONFIG_IS_ENABLED(PRINTF)
 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 #endif
 828
 829 char *simple_itoa(ulong i)
 830 {
 831         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 832         static char local[22];
 833         char *p = &local[21];
 834
 835         *p-- = '\0';
 836         do {
 837                 *p-- = '0' + i % 10;
 838                 i /= 10;
 839         } while (i > 0);
 840         return p + 1;
 841 }
 842
 843 /* We don't seem to have %'d in U-Boot */
 844 void print_grouped_ull(unsigned long long int_val, int digits)
 845 {
 846         char str[21], *s;
 847         int grab = 3;
 848
 849         digits = (digits + 2) / 3;
 850         sprintf(str, "%*llu", digits * 3, int_val);
 851         for (s = str; *s; s += grab) {
 852                 if (s != str)
 853                         putc(s[-1] != ' ' ? ',' : ' ');
 854                 printf("%.*s", grab, s);
 855                 grab = 3;
 856         }
 857 }
 858
 859 bool str2off(const char *p, loff_t *num)
 860 {
 861         char *endptr;
 862
 863         *num = simple_strtoull(p, &endptr, 16);
 864         return *p != '\0' && *endptr == '\0';
 865 }
 866
 867 bool str2long(const char *p, ulong *num)
 868 {
 869         char *endptr;
 870
 871         *num = simple_strtoul(p, &endptr, 16);
 872         return *p != '\0' && *endptr == '\0';
 873 }
 874
 875 char *strmhz(char *buf, unsigned long hz)
 876 {
 877         long l, n;
 878         long m;
 879
 880         n = DIV_ROUND_CLOSEST(hz, 1000) / 1000L;
 881         l = sprintf(buf, "%ld", n);
 882
 883         hz -= n * 1000000L;
 884         m = DIV_ROUND_CLOSEST(hz, 1000L);
 885         if (m != 0)
 886                 sprintf(buf + l, ".%03ld", m);
 887
 888         return buf;
 889 }