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 <stdarg.h>
  15 #include <linux/types.h>
  16 #include <linux/string.h>
  17 #include <linux/ctype.h>
  18 #include <errno.h>
  19
  20 #include <common.h>
  21 #if !defined (CONFIG_PANIC_HANG)
  22 #include <command.h>
  23 #endif
  24
  25 #include <div64.h>
  26 # define NUM_TYPE long long
  27 #define noinline __attribute__((noinline))
  28
  29 /* some reluctance to put this into a new limits.h, so it is here */
  30 #define INT_MAX         ((int)(~0U>>1))
  31
  32 const char hex_asc[] = "0123456789abcdef";
  33 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
  34 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
  35
  36 static inline char *pack_hex_byte(char *buf, u8 byte)
  37 {
  38         *buf++ = hex_asc_hi(byte);
  39         *buf++ = hex_asc_lo(byte);
  40         return buf;
  41 }
  42
  43 unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
  44 {
  45         unsigned long result = 0,value;
  46
  47         if (*cp == '0') {
  48                 cp++;
  49                 if ((*cp == 'x') && isxdigit(cp[1])) {
  50                         base = 16;
  51                         cp++;
  52                 }
  53                 if (!base) {
  54                         base = 8;
  55                 }
  56         }
  57         if (!base) {
  58                 base = 10;
  59         }
  60         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  61             ? toupper(*cp) : *cp)-'A'+10) < base) {
  62                 result = result*base + value;
  63                 cp++;
  64         }
  65         if (endp)
  66                 *endp = (char *)cp;
  67         return result;
  68 }
  69
  70 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
  71 {
  72         char *tail;
  73         unsigned long val;
  74         size_t len;
  75
  76         *res = 0;
  77         len = strlen(cp);
  78         if (len == 0)
  79                 return -EINVAL;
  80
  81         val = simple_strtoul(cp, &tail, base);
  82         if (tail == cp)
  83                 return -EINVAL;
  84
  85         if ((*tail == '\0') ||
  86                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
  87                 *res = val;
  88                 return 0;
  89         }
  90
  91         return -EINVAL;
  92 }
  93
  94 long simple_strtol(const char *cp,char **endp,unsigned int base)
  95 {
  96         if(*cp=='-')
  97                 return -simple_strtoul(cp+1,endp,base);
  98         return simple_strtoul(cp,endp,base);
  99 }
 100
 101 int ustrtoul(const char *cp, char **endp, unsigned int base)
 102 {
 103         unsigned long result = simple_strtoul(cp, endp, base);
 104         switch (**endp) {
 105         case 'G' :
 106                 result *= 1024;
 107                 /* fall through */
 108         case 'M':
 109                 result *= 1024;
 110                 /* fall through */
 111         case 'K':
 112         case 'k':
 113                 result *= 1024;
 114                 if ((*endp)[1] == 'i') {
 115                         if ((*endp)[2] == 'B')
 116                                 (*endp) += 3;
 117                         else
 118                                 (*endp) += 2;
 119                 }
 120         }
 121         return result;
 122 }
 123
 124 unsigned long long simple_strtoull (const char *cp, char **endp, unsigned int base)
 125 {
 126         unsigned long long result = 0, value;
 127
 128         if (*cp == '0') {
 129                 cp++;
 130                 if ((*cp == 'x') && isxdigit (cp[1])) {
 131                         base = 16;
 132                         cp++;
 133                 }
 134                 if (!base) {
 135                         base = 8;
 136                 }
 137         }
 138         if (!base) {
 139                 base = 10;
 140         }
 141         while (isxdigit (*cp) && (value = isdigit (*cp)
 142                                 ? *cp - '0'
 143                                 : (islower (*cp) ? toupper (*cp) : *cp) - 'A' + 10) < base) {
 144                 result = result * base + value;
 145                 cp++;
 146         }
 147         if (endp)
 148                 *endp = (char *) cp;
 149         return result;
 150 }
 151
 152 /* we use this so that we can do without the ctype library */
 153 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
 154
 155 static int skip_atoi(const char **s)
 156 {
 157         int i=0;
 158
 159         while (is_digit(**s))
 160                 i = i*10 + *((*s)++) - '0';
 161         return i;
 162 }
 163
 164 /* Decimal conversion is by far the most typical, and is used
 165  * for /proc and /sys data. This directly impacts e.g. top performance
 166  * with many processes running. We optimize it for speed
 167  * using code from
 168  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 169  * (with permission from the author, Douglas W. Jones). */
 170
 171 /* Formats correctly any integer in [0,99999].
 172  * Outputs from one to five digits depending on input.
 173  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
 174 static char* put_dec_trunc(char *buf, unsigned q)
 175 {
 176         unsigned d3, d2, d1, d0;
 177         d1 = (q>>4) & 0xf;
 178         d2 = (q>>8) & 0xf;
 179         d3 = (q>>12);
 180
 181         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 182         q = (d0 * 0xcd) >> 11;
 183         d0 = d0 - 10*q;
 184         *buf++ = d0 + '0'; /* least significant digit */
 185         d1 = q + 9*d3 + 5*d2 + d1;
 186         if (d1 != 0) {
 187                 q = (d1 * 0xcd) >> 11;
 188                 d1 = d1 - 10*q;
 189                 *buf++ = d1 + '0'; /* next digit */
 190
 191                 d2 = q + 2*d2;
 192                 if ((d2 != 0) || (d3 != 0)) {
 193                         q = (d2 * 0xd) >> 7;
 194                         d2 = d2 - 10*q;
 195                         *buf++ = d2 + '0'; /* next digit */
 196
 197                         d3 = q + 4*d3;
 198                         if (d3 != 0) {
 199                                 q = (d3 * 0xcd) >> 11;
 200                                 d3 = d3 - 10*q;
 201                                 *buf++ = d3 + '0';  /* next digit */
 202                                 if (q != 0)
 203                                         *buf++ = q + '0';  /* most sign. digit */
 204                         }
 205                 }
 206         }
 207         return buf;
 208 }
 209 /* Same with if's removed. Always emits five digits */
 210 static char* put_dec_full(char *buf, unsigned q)
 211 {
 212         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
 213         /* but anyway, gcc produces better code with full-sized ints */
 214         unsigned d3, d2, d1, d0;
 215         d1 = (q>>4) & 0xf;
 216         d2 = (q>>8) & 0xf;
 217         d3 = (q>>12);
 218
 219         /*
 220          * Possible ways to approx. divide by 10
 221          * gcc -O2 replaces multiply with shifts and adds
 222          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 223          * (x * 0x67) >> 10:  1100111
 224          * (x * 0x34) >> 9:    110100 - same
 225          * (x * 0x1a) >> 8:     11010 - same
 226          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 227          */
 228
 229         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 230         q = (d0 * 0xcd) >> 11;
 231         d0 = d0 - 10*q;
 232         *buf++ = d0 + '0';
 233         d1 = q + 9*d3 + 5*d2 + d1;
 234                 q = (d1 * 0xcd) >> 11;
 235                 d1 = d1 - 10*q;
 236                 *buf++ = d1 + '0';
 237
 238                 d2 = q + 2*d2;
 239                         q = (d2 * 0xd) >> 7;
 240                         d2 = d2 - 10*q;
 241                         *buf++ = d2 + '0';
 242
 243                         d3 = q + 4*d3;
 244                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 245                                 /* q = (d3 * 0x67) >> 10; - would also work */
 246                                 d3 = d3 - 10*q;
 247                                 *buf++ = d3 + '0';
 248                                         *buf++ = q + '0';
 249         return buf;
 250 }
 251 /* No inlining helps gcc to use registers better */
 252 static noinline char* put_dec(char *buf, unsigned NUM_TYPE num)
 253 {
 254         while (1) {
 255                 unsigned rem;
 256                 if (num < 100000)
 257                         return put_dec_trunc(buf, num);
 258                 rem = do_div(num, 100000);
 259                 buf = put_dec_full(buf, rem);
 260         }
 261 }
 262
 263 #define ZEROPAD 1               /* pad with zero */
 264 #define SIGN    2               /* unsigned/signed long */
 265 #define PLUS    4               /* show plus */
 266 #define SPACE   8               /* space if plus */
 267 #define LEFT    16              /* left justified */
 268 #define SMALL   32              /* Must be 32 == 0x20 */
 269 #define SPECIAL 64              /* 0x */
 270
 271 #ifdef CONFIG_SYS_VSNPRINTF
 272 /*
 273  * Macro to add a new character to our output string, but only if it will
 274  * fit. The macro moves to the next character position in the output string.
 275  */
 276 #define ADDCH(str, ch) do { \
 277         if ((str) < end) \
 278                 *(str) = (ch); \
 279         ++str; \
 280         } while (0)
 281 #else
 282 #define ADDCH(str, ch)  (*(str)++ = (ch))
 283 #endif
 284
 285 static char *number(char *buf, char *end, unsigned NUM_TYPE num,
 286                 int base, int size, int precision, int type)
 287 {
 288         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 289         static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
 290
 291         char tmp[66];
 292         char sign;
 293         char locase;
 294         int need_pfx = ((type & SPECIAL) && base != 10);
 295         int i;
 296
 297         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 298          * produces same digits or (maybe lowercased) letters */
 299         locase = (type & SMALL);
 300         if (type & LEFT)
 301                 type &= ~ZEROPAD;
 302         sign = 0;
 303         if (type & SIGN) {
 304                 if ((signed NUM_TYPE) num < 0) {
 305                         sign = '-';
 306                         num = - (signed NUM_TYPE) num;
 307                         size--;
 308                 } else if (type & PLUS) {
 309                         sign = '+';
 310                         size--;
 311                 } else if (type & SPACE) {
 312                         sign = ' ';
 313                         size--;
 314                 }
 315         }
 316         if (need_pfx) {
 317                 size--;
 318                 if (base == 16)
 319                         size--;
 320         }
 321
 322         /* generate full string in tmp[], in reverse order */
 323         i = 0;
 324         if (num == 0)
 325                 tmp[i++] = '0';
 326         /* Generic code, for any base:
 327         else do {
 328                 tmp[i++] = (digits[do_div(num,base)] | locase);
 329         } while (num != 0);
 330         */
 331         else if (base != 10) { /* 8 or 16 */
 332                 int mask = base - 1;
 333                 int shift = 3;
 334                 if (base == 16) shift = 4;
 335                 do {
 336                         tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
 337                         num >>= shift;
 338                 } while (num);
 339         } else { /* base 10 */
 340                 i = put_dec(tmp, num) - tmp;
 341         }
 342
 343         /* printing 100 using %2d gives "100", not "00" */
 344         if (i > precision)
 345                 precision = i;
 346         /* leading space padding */
 347         size -= precision;
 348         if (!(type & (ZEROPAD + LEFT))) {
 349                 while (--size >= 0)
 350                         ADDCH(buf, ' ');
 351         }
 352         /* sign */
 353         if (sign)
 354                 ADDCH(buf, sign);
 355         /* "0x" / "0" prefix */
 356         if (need_pfx) {
 357                 ADDCH(buf, '0');
 358                 if (base == 16)
 359                         ADDCH(buf, 'X' | locase);
 360         }
 361         /* zero or space padding */
 362         if (!(type & LEFT)) {
 363                 char c = (type & ZEROPAD) ? '0' : ' ';
 364
 365                 while (--size >= 0)
 366                         ADDCH(buf, c);
 367         }
 368         /* hmm even more zero padding? */
 369         while (i <= --precision)
 370                 ADDCH(buf, '0');
 371         /* actual digits of result */
 372         while (--i >= 0)
 373                 ADDCH(buf, tmp[i]);
 374         /* trailing space padding */
 375         while (--size >= 0)
 376                 ADDCH(buf, ' ');
 377         return buf;
 378 }
 379
 380 static char *string(char *buf, char *end, char *s, int field_width,
 381                 int precision, int flags)
 382 {
 383         int len, i;
 384
 385         if (s == 0)
 386                 s = "<NULL>";
 387
 388         len = strnlen(s, precision);
 389
 390         if (!(flags & LEFT))
 391                 while (len < field_width--)
 392                         ADDCH(buf, ' ');
 393         for (i = 0; i < len; ++i)
 394                 ADDCH(buf, *s++);
 395         while (len < field_width--)
 396                 ADDCH(buf, ' ');
 397         return buf;
 398 }
 399
 400 #ifdef CONFIG_CMD_NET
 401 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 402                                 int precision, int flags)
 403 {
 404         char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
 405         char *p = mac_addr;
 406         int i;
 407
 408         for (i = 0; i < 6; i++) {
 409                 p = pack_hex_byte(p, addr[i]);
 410                 if (!(flags & SPECIAL) && i != 5)
 411                         *p++ = ':';
 412         }
 413         *p = '\0';
 414
 415         return string(buf, end, mac_addr, field_width, precision,
 416                       flags & ~SPECIAL);
 417 }
 418
 419 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 420                          int precision, int flags)
 421 {
 422         char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
 423         char *p = ip6_addr;
 424         int i;
 425
 426         for (i = 0; i < 8; i++) {
 427                 p = pack_hex_byte(p, addr[2 * i]);
 428                 p = pack_hex_byte(p, addr[2 * i + 1]);
 429                 if (!(flags & SPECIAL) && i != 7)
 430                         *p++ = ':';
 431         }
 432         *p = '\0';
 433
 434         return string(buf, end, ip6_addr, field_width, precision,
 435                       flags & ~SPECIAL);
 436 }
 437
 438 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 439                          int precision, int flags)
 440 {
 441         char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
 442         char temp[3];   /* hold each IP quad in reverse order */
 443         char *p = ip4_addr;
 444         int i, digits;
 445
 446         for (i = 0; i < 4; i++) {
 447                 digits = put_dec_trunc(temp, addr[i]) - temp;
 448                 /* reverse the digits in the quad */
 449                 while (digits--)
 450                         *p++ = temp[digits];
 451                 if (i != 3)
 452                         *p++ = '.';
 453         }
 454         *p = '\0';
 455
 456         return string(buf, end, ip4_addr, field_width, precision,
 457                       flags & ~SPECIAL);
 458 }
 459 #endif
 460
 461 /*
 462  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 463  * by an extra set of alphanumeric characters that are extended format
 464  * specifiers.
 465  *
 466  * Right now we handle:
 467  *
 468  * - 'M' For a 6-byte MAC address, it prints the address in the
 469  *       usual colon-separated hex notation
 470  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 471  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 472  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 473  *       currently the same
 474  *
 475  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 476  * function pointers are really function descriptors, which contain a
 477  * pointer to the real address.
 478  */
 479 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 480                 int field_width, int precision, int flags)
 481 {
 482         if (!ptr)
 483                 return string(buf, end, "(null)", field_width, precision,
 484                               flags);
 485
 486 #ifdef CONFIG_CMD_NET
 487         switch (*fmt) {
 488         case 'm':
 489                 flags |= SPECIAL;
 490                 /* Fallthrough */
 491         case 'M':
 492                 return mac_address_string(buf, end, ptr, field_width,
 493                                           precision, flags);
 494         case 'i':
 495                 flags |= SPECIAL;
 496                 /* Fallthrough */
 497         case 'I':
 498                 if (fmt[1] == '6')
 499                         return ip6_addr_string(buf, end, ptr, field_width,
 500                                                precision, flags);
 501                 if (fmt[1] == '4')
 502                         return ip4_addr_string(buf, end, ptr, field_width,
 503                                                precision, flags);
 504                 flags &= ~SPECIAL;
 505                 break;
 506         }
 507 #endif
 508         flags |= SMALL;
 509         if (field_width == -1) {
 510                 field_width = 2*sizeof(void *);
 511                 flags |= ZEROPAD;
 512         }
 513         return number(buf, end, (unsigned long)ptr, 16, field_width,
 514                       precision, flags);
 515 }
 516
 517 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 518                               va_list args)
 519 {
 520         unsigned NUM_TYPE num;
 521         int base;
 522         char *str;
 523
 524         int flags;              /* flags to number() */
 525
 526         int field_width;        /* width of output field */
 527         int precision;          /* min. # of digits for integers; max
 528                                    number of chars for from string */
 529         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 530                                 /* 'z' support added 23/7/1999 S.H.    */
 531                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 532                                 /* 't' added for ptrdiff_t */
 533         char *end = buf + size;
 534
 535 #ifdef CONFIG_SYS_VSNPRINTF
 536         /* Make sure end is always >= buf - do we want this in U-Boot? */
 537         if (end < buf) {
 538                 end = ((void *)-1);
 539                 size = end - buf;
 540         }
 541 #endif
 542         str = buf;
 543
 544         for (; *fmt ; ++fmt) {
 545                 if (*fmt != '%') {
 546                         ADDCH(str, *fmt);
 547                         continue;
 548                 }
 549
 550                 /* process flags */
 551                 flags = 0;
 552                 repeat:
 553                         ++fmt;          /* this also skips first '%' */
 554                         switch (*fmt) {
 555                                 case '-': flags |= LEFT; goto repeat;
 556                                 case '+': flags |= PLUS; goto repeat;
 557                                 case ' ': flags |= SPACE; goto repeat;
 558                                 case '#': flags |= SPECIAL; goto repeat;
 559                                 case '0': flags |= ZEROPAD; goto repeat;
 560                         }
 561
 562                 /* get field width */
 563                 field_width = -1;
 564                 if (is_digit(*fmt))
 565                         field_width = skip_atoi(&fmt);
 566                 else if (*fmt == '*') {
 567                         ++fmt;
 568                         /* it's the next argument */
 569                         field_width = va_arg(args, int);
 570                         if (field_width < 0) {
 571                                 field_width = -field_width;
 572                                 flags |= LEFT;
 573                         }
 574                 }
 575
 576                 /* get the precision */
 577                 precision = -1;
 578                 if (*fmt == '.') {
 579                         ++fmt;
 580                         if (is_digit(*fmt))
 581                                 precision = skip_atoi(&fmt);
 582                         else if (*fmt == '*') {
 583                                 ++fmt;
 584                                 /* it's the next argument */
 585                                 precision = va_arg(args, int);
 586                         }
 587                         if (precision < 0)
 588                                 precision = 0;
 589                 }
 590
 591                 /* get the conversion qualifier */
 592                 qualifier = -1;
 593                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 594                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 595                         qualifier = *fmt;
 596                         ++fmt;
 597                         if (qualifier == 'l' && *fmt == 'l') {
 598                                 qualifier = 'L';
 599                                 ++fmt;
 600                         }
 601                 }
 602
 603                 /* default base */
 604                 base = 10;
 605
 606                 switch (*fmt) {
 607                 case 'c':
 608                         if (!(flags & LEFT)) {
 609                                 while (--field_width > 0)
 610                                         ADDCH(str, ' ');
 611                         }
 612                         ADDCH(str, (unsigned char) va_arg(args, int));
 613                         while (--field_width > 0)
 614                                 ADDCH(str, ' ');
 615                         continue;
 616
 617                 case 's':
 618                         str = string(str, end, va_arg(args, char *),
 619                                      field_width, precision, flags);
 620                         continue;
 621
 622                 case 'p':
 623                         str = pointer(fmt+1, str, end,
 624                                         va_arg(args, void *),
 625                                         field_width, precision, flags);
 626                         /* Skip all alphanumeric pointer suffixes */
 627                         while (isalnum(fmt[1]))
 628                                 fmt++;
 629                         continue;
 630
 631                 case 'n':
 632                         if (qualifier == 'l') {
 633                                 long * ip = va_arg(args, long *);
 634                                 *ip = (str - buf);
 635                         } else {
 636                                 int * ip = va_arg(args, int *);
 637                                 *ip = (str - buf);
 638                         }
 639                         continue;
 640
 641                 case '%':
 642                         ADDCH(str, '%');
 643                         continue;
 644
 645                 /* integer number formats - set up the flags and "break" */
 646                 case 'o':
 647                         base = 8;
 648                         break;
 649
 650                 case 'x':
 651                         flags |= SMALL;
 652                 case 'X':
 653                         base = 16;
 654                         break;
 655
 656                 case 'd':
 657                 case 'i':
 658                         flags |= SIGN;
 659                 case 'u':
 660                         break;
 661
 662                 default:
 663                         ADDCH(str, '%');
 664                         if (*fmt)
 665                                 ADDCH(str, *fmt);
 666                         else
 667                                 --fmt;
 668                         continue;
 669                 }
 670                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 671                         num = va_arg(args, unsigned long long);
 672                 else if (qualifier == 'l') {
 673                         num = va_arg(args, unsigned long);
 674                         if (flags & SIGN)
 675                                 num = (signed long) num;
 676                 } else if (qualifier == 'Z' || qualifier == 'z') {
 677                         num = va_arg(args, size_t);
 678                 } else if (qualifier == 't') {
 679                         num = va_arg(args, ptrdiff_t);
 680                 } else if (qualifier == 'h') {
 681                         num = (unsigned short) va_arg(args, int);
 682                         if (flags & SIGN)
 683                                 num = (signed short) num;
 684                 } else {
 685                         num = va_arg(args, unsigned int);
 686                         if (flags & SIGN)
 687                                 num = (signed int) num;
 688                 }
 689                 str = number(str, end, num, base, field_width, precision,
 690                              flags);
 691         }
 692
 693 #ifdef CONFIG_SYS_VSNPRINTF
 694         if (size > 0) {
 695                 ADDCH(str, '\0');
 696                 if (str > end)
 697                         end[-1] = '\0';
 698         }
 699 #else
 700         *str = '\0';
 701 #endif
 702         /* the trailing null byte doesn't count towards the total */
 703         return str-buf;
 704 }
 705
 706 #ifdef CONFIG_SYS_VSNPRINTF
 707 int vsnprintf(char *buf, size_t size, const char *fmt,
 708                               va_list args)
 709 {
 710         return vsnprintf_internal(buf, size, fmt, args);
 711 }
 712
 713 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 714 {
 715         int i;
 716
 717         i = vsnprintf(buf, size, fmt, args);
 718
 719         if (likely(i < size))
 720                 return i;
 721         if (size != 0)
 722                 return size - 1;
 723         return 0;
 724 }
 725
 726 int snprintf(char *buf, size_t size, const char *fmt, ...)
 727 {
 728         va_list args;
 729         int i;
 730
 731         va_start(args, fmt);
 732         i = vsnprintf(buf, size, fmt, args);
 733         va_end(args);
 734
 735         return i;
 736 }
 737
 738 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 739 {
 740         va_list args;
 741         int i;
 742
 743         va_start(args, fmt);
 744         i = vscnprintf(buf, size, fmt, args);
 745         va_end(args);
 746
 747         return i;
 748 }
 749 #endif /* CONFIG_SYS_VSNPRINT */
 750
 751 /**
 752  * Format a string and place it in a buffer (va_list version)
 753  *
 754  * @param buf   The buffer to place the result into
 755  * @param fmt   The format string to use
 756  * @param args  Arguments for the format string
 757  *
 758  * The function returns the number of characters written
 759  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 760  * buffer overflows.
 761  *
 762  * If you're not already dealing with a va_list consider using sprintf().
 763  */
 764 int vsprintf(char *buf, const char *fmt, va_list args)
 765 {
 766         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 767 }
 768
 769 int sprintf(char * buf, const char *fmt, ...)
 770 {
 771         va_list args;
 772         int i;
 773
 774         va_start(args, fmt);
 775         i=vsprintf(buf,fmt,args);
 776         va_end(args);
 777         return i;
 778 }
 779
 780 void panic(const char *fmt, ...)
 781 {
 782         va_list args;
 783         va_start(args, fmt);
 784         vprintf(fmt, args);
 785         putc('\n');
 786         va_end(args);
 787 #if defined (CONFIG_PANIC_HANG)
 788         hang();
 789 #else
 790         udelay (100000);        /* allow messages to go out */
 791         do_reset (NULL, 0, 0, NULL);
 792 #endif
 793         while (1)
 794                 ;
 795 }
 796
 797 void __assert_fail(const char *assertion, const char *file, unsigned line,
 798                    const char *function)
 799 {
 800         /* This will not return */
 801         panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
 802               assertion);
 803 }
 804
 805 char *simple_itoa(ulong i)
 806 {
 807         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 808         static char local[22];
 809         char *p = &local[21];
 810
 811         *p-- = '\0';
 812         do {
 813                 *p-- = '0' + i % 10;
 814                 i /= 10;
 815         } while (i > 0);
 816         return p + 1;
 817 }