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 noinline __attribute__((noinline))
  27
  28 unsigned long simple_strtoul(const char *cp, char **endp,
  29                                 unsigned int base)
  30 {
  31         unsigned long result = 0;
  32         unsigned long value;
  33
  34         if (*cp == '0') {
  35                 cp++;
  36                 if ((*cp == 'x') && isxdigit(cp[1])) {
  37                         base = 16;
  38                         cp++;
  39                 }
  40
  41                 if (!base)
  42                         base = 8;
  43         }
  44
  45         if (!base)
  46                 base = 10;
  47
  48         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
  49             ? toupper(*cp) : *cp)-'A'+10) < base) {
  50                 result = result*base + value;
  51                 cp++;
  52         }
  53
  54         if (endp)
  55                 *endp = (char *)cp;
  56
  57         return result;
  58 }
  59
  60 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
  61 {
  62         char *tail;
  63         unsigned long val;
  64         size_t len;
  65
  66         *res = 0;
  67         len = strlen(cp);
  68         if (len == 0)
  69                 return -EINVAL;
  70
  71         val = simple_strtoul(cp, &tail, base);
  72         if (tail == cp)
  73                 return -EINVAL;
  74
  75         if ((*tail == '\0') ||
  76                 ((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
  77                 *res = val;
  78                 return 0;
  79         }
  80
  81         return -EINVAL;
  82 }
  83
  84 long simple_strtol(const char *cp, char **endp, unsigned int base)
  85 {
  86         if (*cp == '-')
  87                 return -simple_strtoul(cp + 1, endp, base);
  88
  89         return simple_strtoul(cp, endp, base);
  90 }
  91
  92 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
  93 {
  94         unsigned long result = simple_strtoul(cp, endp, base);
  95         switch (**endp) {
  96         case 'G':
  97                 result *= 1024;
  98                 /* fall through */
  99         case 'M':
 100                 result *= 1024;
 101                 /* fall through */
 102         case 'K':
 103         case 'k':
 104                 result *= 1024;
 105                 if ((*endp)[1] == 'i') {
 106                         if ((*endp)[2] == 'B')
 107                                 (*endp) += 3;
 108                         else
 109                                 (*endp) += 2;
 110                 }
 111         }
 112         return result;
 113 }
 114
 115 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
 116 {
 117         unsigned long long result = simple_strtoull(cp, endp, base);
 118         switch (**endp) {
 119         case 'G':
 120                 result *= 1024;
 121                 /* fall through */
 122         case 'M':
 123                 result *= 1024;
 124                 /* fall through */
 125         case 'K':
 126         case 'k':
 127                 result *= 1024;
 128                 if ((*endp)[1] == 'i') {
 129                         if ((*endp)[2] == 'B')
 130                                 (*endp) += 3;
 131                         else
 132                                 (*endp) += 2;
 133                 }
 134         }
 135         return result;
 136 }
 137
 138 unsigned long long simple_strtoull(const char *cp, char **endp,
 139                                         unsigned int base)
 140 {
 141         unsigned long long result = 0, value;
 142
 143         if (*cp == '0') {
 144                 cp++;
 145                 if ((*cp == 'x') && isxdigit(cp[1])) {
 146                         base = 16;
 147                         cp++;
 148                 }
 149
 150                 if (!base)
 151                         base = 8;
 152         }
 153
 154         if (!base)
 155                 base = 10;
 156
 157         while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
 158                 : (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
 159                 result = result * base + value;
 160                 cp++;
 161         }
 162
 163         if (endp)
 164                 *endp = (char *) cp;
 165
 166         return result;
 167 }
 168
 169 long trailing_strtoln(const char *str, const char *end)
 170 {
 171         const char *p;
 172
 173         if (!end)
 174                 end = str + strlen(str);
 175         for (p = end - 1; p > str; p--) {
 176                 if (!isdigit(*p))
 177                         return simple_strtoul(p + 1, NULL, 10);
 178         }
 179
 180         return -1;
 181 }
 182
 183 long trailing_strtol(const char *str)
 184 {
 185         return trailing_strtoln(str, NULL);
 186 }
 187
 188 /* we use this so that we can do without the ctype library */
 189 #define is_digit(c)     ((c) >= '0' && (c) <= '9')
 190
 191 static int skip_atoi(const char **s)
 192 {
 193         int i = 0;
 194
 195         while (is_digit(**s))
 196                 i = i * 10 + *((*s)++) - '0';
 197
 198         return i;
 199 }
 200
 201 /* Decimal conversion is by far the most typical, and is used
 202  * for /proc and /sys data. This directly impacts e.g. top performance
 203  * with many processes running. We optimize it for speed
 204  * using code from
 205  * http://www.cs.uiowa.edu/~jones/bcd/decimal.html
 206  * (with permission from the author, Douglas W. Jones). */
 207
 208 /* Formats correctly any integer in [0,99999].
 209  * Outputs from one to five digits depending on input.
 210  * On i386 gcc 4.1.2 -O2: ~250 bytes of code. */
 211 static char *put_dec_trunc(char *buf, unsigned q)
 212 {
 213         unsigned d3, d2, d1, d0;
 214         d1 = (q>>4) & 0xf;
 215         d2 = (q>>8) & 0xf;
 216         d3 = (q>>12);
 217
 218         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 219         q = (d0 * 0xcd) >> 11;
 220         d0 = d0 - 10*q;
 221         *buf++ = d0 + '0'; /* least significant digit */
 222         d1 = q + 9*d3 + 5*d2 + d1;
 223         if (d1 != 0) {
 224                 q = (d1 * 0xcd) >> 11;
 225                 d1 = d1 - 10*q;
 226                 *buf++ = d1 + '0'; /* next digit */
 227
 228                 d2 = q + 2*d2;
 229                 if ((d2 != 0) || (d3 != 0)) {
 230                         q = (d2 * 0xd) >> 7;
 231                         d2 = d2 - 10*q;
 232                         *buf++ = d2 + '0'; /* next digit */
 233
 234                         d3 = q + 4*d3;
 235                         if (d3 != 0) {
 236                                 q = (d3 * 0xcd) >> 11;
 237                                 d3 = d3 - 10*q;
 238                                 *buf++ = d3 + '0';  /* next digit */
 239                                 if (q != 0)
 240                                         *buf++ = q + '0'; /* most sign. digit */
 241                         }
 242                 }
 243         }
 244         return buf;
 245 }
 246 /* Same with if's removed. Always emits five digits */
 247 static char *put_dec_full(char *buf, unsigned q)
 248 {
 249         /* BTW, if q is in [0,9999], 8-bit ints will be enough, */
 250         /* but anyway, gcc produces better code with full-sized ints */
 251         unsigned d3, d2, d1, d0;
 252         d1 = (q>>4) & 0xf;
 253         d2 = (q>>8) & 0xf;
 254         d3 = (q>>12);
 255
 256         /*
 257          * Possible ways to approx. divide by 10
 258          * gcc -O2 replaces multiply with shifts and adds
 259          * (x * 0xcd) >> 11: 11001101 - shorter code than * 0x67 (on i386)
 260          * (x * 0x67) >> 10:  1100111
 261          * (x * 0x34) >> 9:    110100 - same
 262          * (x * 0x1a) >> 8:     11010 - same
 263          * (x * 0x0d) >> 7:      1101 - same, shortest code (on i386)
 264          */
 265
 266         d0 = 6*(d3 + d2 + d1) + (q & 0xf);
 267         q = (d0 * 0xcd) >> 11;
 268         d0 = d0 - 10*q;
 269         *buf++ = d0 + '0';
 270         d1 = q + 9*d3 + 5*d2 + d1;
 271                 q = (d1 * 0xcd) >> 11;
 272                 d1 = d1 - 10*q;
 273                 *buf++ = d1 + '0';
 274
 275                 d2 = q + 2*d2;
 276                         q = (d2 * 0xd) >> 7;
 277                         d2 = d2 - 10*q;
 278                         *buf++ = d2 + '0';
 279
 280                         d3 = q + 4*d3;
 281                                 q = (d3 * 0xcd) >> 11; /* - shorter code */
 282                                 /* q = (d3 * 0x67) >> 10; - would also work */
 283                                 d3 = d3 - 10*q;
 284                                 *buf++ = d3 + '0';
 285                                         *buf++ = q + '0';
 286         return buf;
 287 }
 288 /* No inlining helps gcc to use registers better */
 289 static noinline char *put_dec(char *buf, uint64_t num)
 290 {
 291         while (1) {
 292                 unsigned rem;
 293                 if (num < 100000)
 294                         return put_dec_trunc(buf, num);
 295                 rem = do_div(num, 100000);
 296                 buf = put_dec_full(buf, rem);
 297         }
 298 }
 299
 300 #define ZEROPAD 1               /* pad with zero */
 301 #define SIGN    2               /* unsigned/signed long */
 302 #define PLUS    4               /* show plus */
 303 #define SPACE   8               /* space if plus */
 304 #define LEFT    16              /* left justified */
 305 #define SMALL   32              /* Must be 32 == 0x20 */
 306 #define SPECIAL 64              /* 0x */
 307
 308 #ifdef CONFIG_SYS_VSNPRINTF
 309 /*
 310  * Macro to add a new character to our output string, but only if it will
 311  * fit. The macro moves to the next character position in the output string.
 312  */
 313 #define ADDCH(str, ch) do { \
 314         if ((str) < end) \
 315                 *(str) = (ch); \
 316         ++str; \
 317         } while (0)
 318 #else
 319 #define ADDCH(str, ch)  (*(str)++ = (ch))
 320 #endif
 321
 322 static char *number(char *buf, char *end, u64 num,
 323                 int base, int size, int precision, int type)
 324 {
 325         /* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
 326         static const char digits[16] = "0123456789ABCDEF";
 327
 328         char tmp[66];
 329         char sign;
 330         char locase;
 331         int need_pfx = ((type & SPECIAL) && base != 10);
 332         int i;
 333
 334         /* locase = 0 or 0x20. ORing digits or letters with 'locase'
 335          * produces same digits or (maybe lowercased) letters */
 336         locase = (type & SMALL);
 337         if (type & LEFT)
 338                 type &= ~ZEROPAD;
 339         sign = 0;
 340         if (type & SIGN) {
 341                 if ((s64) num < 0) {
 342                         sign = '-';
 343                         num = -(s64) num;
 344                         size--;
 345                 } else if (type & PLUS) {
 346                         sign = '+';
 347                         size--;
 348                 } else if (type & SPACE) {
 349                         sign = ' ';
 350                         size--;
 351                 }
 352         }
 353         if (need_pfx) {
 354                 size--;
 355                 if (base == 16)
 356                         size--;
 357         }
 358
 359         /* generate full string in tmp[], in reverse order */
 360         i = 0;
 361         if (num == 0)
 362                 tmp[i++] = '0';
 363         /* Generic code, for any base:
 364         else do {
 365                 tmp[i++] = (digits[do_div(num,base)] | locase);
 366         } while (num != 0);
 367         */
 368         else if (base != 10) { /* 8 or 16 */
 369                 int mask = base - 1;
 370                 int shift = 3;
 371
 372                 if (base == 16)
 373                         shift = 4;
 374
 375                 do {
 376                         tmp[i++] = (digits[((unsigned char)num) & mask]
 377                                         | locase);
 378                         num >>= shift;
 379                 } while (num);
 380         } else { /* base 10 */
 381                 i = put_dec(tmp, num) - tmp;
 382         }
 383
 384         /* printing 100 using %2d gives "100", not "00" */
 385         if (i > precision)
 386                 precision = i;
 387         /* leading space padding */
 388         size -= precision;
 389         if (!(type & (ZEROPAD + LEFT))) {
 390                 while (--size >= 0)
 391                         ADDCH(buf, ' ');
 392         }
 393         /* sign */
 394         if (sign)
 395                 ADDCH(buf, sign);
 396         /* "0x" / "0" prefix */
 397         if (need_pfx) {
 398                 ADDCH(buf, '0');
 399                 if (base == 16)
 400                         ADDCH(buf, 'X' | locase);
 401         }
 402         /* zero or space padding */
 403         if (!(type & LEFT)) {
 404                 char c = (type & ZEROPAD) ? '0' : ' ';
 405
 406                 while (--size >= 0)
 407                         ADDCH(buf, c);
 408         }
 409         /* hmm even more zero padding? */
 410         while (i <= --precision)
 411                 ADDCH(buf, '0');
 412         /* actual digits of result */
 413         while (--i >= 0)
 414                 ADDCH(buf, tmp[i]);
 415         /* trailing space padding */
 416         while (--size >= 0)
 417                 ADDCH(buf, ' ');
 418         return buf;
 419 }
 420
 421 static char *string(char *buf, char *end, char *s, int field_width,
 422                 int precision, int flags)
 423 {
 424         int len, i;
 425
 426         if (s == NULL)
 427                 s = "<NULL>";
 428
 429         len = strnlen(s, precision);
 430
 431         if (!(flags & LEFT))
 432                 while (len < field_width--)
 433                         ADDCH(buf, ' ');
 434         for (i = 0; i < len; ++i)
 435                 ADDCH(buf, *s++);
 436         while (len < field_width--)
 437                 ADDCH(buf, ' ');
 438         return buf;
 439 }
 440
 441 #ifdef CONFIG_CMD_NET
 442 static const char hex_asc[] = "0123456789abcdef";
 443 #define hex_asc_lo(x)   hex_asc[((x) & 0x0f)]
 444 #define hex_asc_hi(x)   hex_asc[((x) & 0xf0) >> 4]
 445
 446 static inline char *pack_hex_byte(char *buf, u8 byte)
 447 {
 448         *buf++ = hex_asc_hi(byte);
 449         *buf++ = hex_asc_lo(byte);
 450         return buf;
 451 }
 452
 453 static char *mac_address_string(char *buf, char *end, u8 *addr, int field_width,
 454                                 int precision, int flags)
 455 {
 456         /* (6 * 2 hex digits), 5 colons and trailing zero */
 457         char mac_addr[6 * 3];
 458         char *p = mac_addr;
 459         int i;
 460
 461         for (i = 0; i < 6; i++) {
 462                 p = pack_hex_byte(p, addr[i]);
 463                 if (!(flags & SPECIAL) && i != 5)
 464                         *p++ = ':';
 465         }
 466         *p = '\0';
 467
 468         return string(buf, end, mac_addr, field_width, precision,
 469                       flags & ~SPECIAL);
 470 }
 471
 472 static char *ip6_addr_string(char *buf, char *end, u8 *addr, int field_width,
 473                          int precision, int flags)
 474 {
 475         /* (8 * 4 hex digits), 7 colons and trailing zero */
 476         char ip6_addr[8 * 5];
 477         char *p = ip6_addr;
 478         int i;
 479
 480         for (i = 0; i < 8; i++) {
 481                 p = pack_hex_byte(p, addr[2 * i]);
 482                 p = pack_hex_byte(p, addr[2 * i + 1]);
 483                 if (!(flags & SPECIAL) && i != 7)
 484                         *p++ = ':';
 485         }
 486         *p = '\0';
 487
 488         return string(buf, end, ip6_addr, field_width, precision,
 489                       flags & ~SPECIAL);
 490 }
 491
 492 static char *ip4_addr_string(char *buf, char *end, u8 *addr, int field_width,
 493                          int precision, int flags)
 494 {
 495         /* (4 * 3 decimal digits), 3 dots and trailing zero */
 496         char ip4_addr[4 * 4];
 497         char temp[3];   /* hold each IP quad in reverse order */
 498         char *p = ip4_addr;
 499         int i, digits;
 500
 501         for (i = 0; i < 4; i++) {
 502                 digits = put_dec_trunc(temp, addr[i]) - temp;
 503                 /* reverse the digits in the quad */
 504                 while (digits--)
 505                         *p++ = temp[digits];
 506                 if (i != 3)
 507                         *p++ = '.';
 508         }
 509         *p = '\0';
 510
 511         return string(buf, end, ip4_addr, field_width, precision,
 512                       flags & ~SPECIAL);
 513 }
 514 #endif
 515
 516 /*
 517  * Show a '%p' thing.  A kernel extension is that the '%p' is followed
 518  * by an extra set of alphanumeric characters that are extended format
 519  * specifiers.
 520  *
 521  * Right now we handle:
 522  *
 523  * - 'M' For a 6-byte MAC address, it prints the address in the
 524  *       usual colon-separated hex notation
 525  * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
 526  *       decimal for v4 and colon separated network-order 16 bit hex for v6)
 527  * - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
 528  *       currently the same
 529  *
 530  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
 531  * function pointers are really function descriptors, which contain a
 532  * pointer to the real address.
 533  */
 534 static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
 535                 int field_width, int precision, int flags)
 536 {
 537         u64 num = (uintptr_t)ptr;
 538
 539         /*
 540          * Being a boot loader, we explicitly allow pointers to
 541          * (physical) address null.
 542          */
 543 #if 0
 544         if (!ptr)
 545                 return string(buf, end, "(null)", field_width, precision,
 546                               flags);
 547 #endif
 548
 549 #ifdef CONFIG_CMD_NET
 550         switch (*fmt) {
 551         case 'a':
 552                 flags |= SPECIAL | ZEROPAD;
 553
 554                 switch (fmt[1]) {
 555                 case 'p':
 556                 default:
 557                         field_width = sizeof(phys_addr_t) * 2 + 2;
 558                         num = *(phys_addr_t *)ptr;
 559                         break;
 560                 }
 561                 break;
 562         case 'm':
 563                 flags |= SPECIAL;
 564                 /* Fallthrough */
 565         case 'M':
 566                 return mac_address_string(buf, end, ptr, field_width,
 567                                           precision, flags);
 568         case 'i':
 569                 flags |= SPECIAL;
 570                 /* Fallthrough */
 571         case 'I':
 572                 if (fmt[1] == '6')
 573                         return ip6_addr_string(buf, end, ptr, field_width,
 574                                                precision, flags);
 575                 if (fmt[1] == '4')
 576                         return ip4_addr_string(buf, end, ptr, field_width,
 577                                                precision, flags);
 578                 flags &= ~SPECIAL;
 579                 break;
 580         }
 581 #endif
 582         flags |= SMALL;
 583         if (field_width == -1) {
 584                 field_width = 2*sizeof(void *);
 585                 flags |= ZEROPAD;
 586         }
 587         return number(buf, end, num, 16, field_width, precision, flags);
 588 }
 589
 590 static int vsnprintf_internal(char *buf, size_t size, const char *fmt,
 591                               va_list args)
 592 {
 593         u64 num;
 594         int base;
 595         char *str;
 596
 597         int flags;              /* flags to number() */
 598
 599         int field_width;        /* width of output field */
 600         int precision;          /* min. # of digits for integers; max
 601                                    number of chars for from string */
 602         int qualifier;          /* 'h', 'l', or 'L' for integer fields */
 603                                 /* 'z' support added 23/7/1999 S.H.    */
 604                                 /* 'z' changed to 'Z' --davidm 1/25/99 */
 605                                 /* 't' added for ptrdiff_t */
 606         char *end = buf + size;
 607
 608 #ifdef CONFIG_SYS_VSNPRINTF
 609         /* Make sure end is always >= buf - do we want this in U-Boot? */
 610         if (end < buf) {
 611                 end = ((void *)-1);
 612                 size = end - buf;
 613         }
 614 #endif
 615         str = buf;
 616
 617         for (; *fmt ; ++fmt) {
 618                 if (*fmt != '%') {
 619                         ADDCH(str, *fmt);
 620                         continue;
 621                 }
 622
 623                 /* process flags */
 624                 flags = 0;
 625 repeat:
 626                         ++fmt;          /* this also skips first '%' */
 627                         switch (*fmt) {
 628                         case '-':
 629                                 flags |= LEFT;
 630                                 goto repeat;
 631                         case '+':
 632                                 flags |= PLUS;
 633                                 goto repeat;
 634                         case ' ':
 635                                 flags |= SPACE;
 636                                 goto repeat;
 637                         case '#':
 638                                 flags |= SPECIAL;
 639                                 goto repeat;
 640                         case '0':
 641                                 flags |= ZEROPAD;
 642                                 goto repeat;
 643                         }
 644
 645                 /* get field width */
 646                 field_width = -1;
 647                 if (is_digit(*fmt))
 648                         field_width = skip_atoi(&fmt);
 649                 else if (*fmt == '*') {
 650                         ++fmt;
 651                         /* it's the next argument */
 652                         field_width = va_arg(args, int);
 653                         if (field_width < 0) {
 654                                 field_width = -field_width;
 655                                 flags |= LEFT;
 656                         }
 657                 }
 658
 659                 /* get the precision */
 660                 precision = -1;
 661                 if (*fmt == '.') {
 662                         ++fmt;
 663                         if (is_digit(*fmt))
 664                                 precision = skip_atoi(&fmt);
 665                         else if (*fmt == '*') {
 666                                 ++fmt;
 667                                 /* it's the next argument */
 668                                 precision = va_arg(args, int);
 669                         }
 670                         if (precision < 0)
 671                                 precision = 0;
 672                 }
 673
 674                 /* get the conversion qualifier */
 675                 qualifier = -1;
 676                 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
 677                     *fmt == 'Z' || *fmt == 'z' || *fmt == 't') {
 678                         qualifier = *fmt;
 679                         ++fmt;
 680                         if (qualifier == 'l' && *fmt == 'l') {
 681                                 qualifier = 'L';
 682                                 ++fmt;
 683                         }
 684                 }
 685
 686                 /* default base */
 687                 base = 10;
 688
 689                 switch (*fmt) {
 690                 case 'c':
 691                         if (!(flags & LEFT)) {
 692                                 while (--field_width > 0)
 693                                         ADDCH(str, ' ');
 694                         }
 695                         ADDCH(str, (unsigned char) va_arg(args, int));
 696                         while (--field_width > 0)
 697                                 ADDCH(str, ' ');
 698                         continue;
 699
 700                 case 's':
 701                         str = string(str, end, va_arg(args, char *),
 702                                      field_width, precision, flags);
 703                         continue;
 704
 705                 case 'p':
 706                         str = pointer(fmt + 1, str, end,
 707                                         va_arg(args, void *),
 708                                         field_width, precision, flags);
 709                         /* Skip all alphanumeric pointer suffixes */
 710                         while (isalnum(fmt[1]))
 711                                 fmt++;
 712                         continue;
 713
 714                 case 'n':
 715                         if (qualifier == 'l') {
 716                                 long *ip = va_arg(args, long *);
 717                                 *ip = (str - buf);
 718                         } else {
 719                                 int *ip = va_arg(args, int *);
 720                                 *ip = (str - buf);
 721                         }
 722                         continue;
 723
 724                 case '%':
 725                         ADDCH(str, '%');
 726                         continue;
 727
 728                 /* integer number formats - set up the flags and "break" */
 729                 case 'o':
 730                         base = 8;
 731                         break;
 732
 733                 case 'x':
 734                         flags |= SMALL;
 735                 case 'X':
 736                         base = 16;
 737                         break;
 738
 739                 case 'd':
 740                 case 'i':
 741                         flags |= SIGN;
 742                 case 'u':
 743                         break;
 744
 745                 default:
 746                         ADDCH(str, '%');
 747                         if (*fmt)
 748                                 ADDCH(str, *fmt);
 749                         else
 750                                 --fmt;
 751                         continue;
 752                 }
 753                 if (qualifier == 'L')  /* "quad" for 64 bit variables */
 754                         num = va_arg(args, unsigned long long);
 755                 else if (qualifier == 'l') {
 756                         num = va_arg(args, unsigned long);
 757                         if (flags & SIGN)
 758                                 num = (signed long) num;
 759                 } else if (qualifier == 'Z' || qualifier == 'z') {
 760                         num = va_arg(args, size_t);
 761                 } else if (qualifier == 't') {
 762                         num = va_arg(args, ptrdiff_t);
 763                 } else if (qualifier == 'h') {
 764                         num = (unsigned short) va_arg(args, int);
 765                         if (flags & SIGN)
 766                                 num = (signed short) num;
 767                 } else {
 768                         num = va_arg(args, unsigned int);
 769                         if (flags & SIGN)
 770                                 num = (signed int) num;
 771                 }
 772                 str = number(str, end, num, base, field_width, precision,
 773                              flags);
 774         }
 775
 776 #ifdef CONFIG_SYS_VSNPRINTF
 777         if (size > 0) {
 778                 ADDCH(str, '\0');
 779                 if (str > end)
 780                         end[-1] = '\0';
 781                 --str;
 782         }
 783 #else
 784         *str = '\0';
 785 #endif
 786         /* the trailing null byte doesn't count towards the total */
 787         return str - buf;
 788 }
 789
 790 #ifdef CONFIG_SYS_VSNPRINTF
 791 int vsnprintf(char *buf, size_t size, const char *fmt,
 792                               va_list args)
 793 {
 794         return vsnprintf_internal(buf, size, fmt, args);
 795 }
 796
 797 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
 798 {
 799         int i;
 800
 801         i = vsnprintf(buf, size, fmt, args);
 802
 803         if (likely(i < size))
 804                 return i;
 805         if (size != 0)
 806                 return size - 1;
 807         return 0;
 808 }
 809
 810 int snprintf(char *buf, size_t size, const char *fmt, ...)
 811 {
 812         va_list args;
 813         int i;
 814
 815         va_start(args, fmt);
 816         i = vsnprintf(buf, size, fmt, args);
 817         va_end(args);
 818
 819         return i;
 820 }
 821
 822 int scnprintf(char *buf, size_t size, const char *fmt, ...)
 823 {
 824         va_list args;
 825         int i;
 826
 827         va_start(args, fmt);
 828         i = vscnprintf(buf, size, fmt, args);
 829         va_end(args);
 830
 831         return i;
 832 }
 833 #endif /* CONFIG_SYS_VSNPRINT */
 834
 835 /**
 836  * Format a string and place it in a buffer (va_list version)
 837  *
 838  * @param buf   The buffer to place the result into
 839  * @param fmt   The format string to use
 840  * @param args  Arguments for the format string
 841  *
 842  * The function returns the number of characters written
 843  * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
 844  * buffer overflows.
 845  *
 846  * If you're not already dealing with a va_list consider using sprintf().
 847  */
 848 int vsprintf(char *buf, const char *fmt, va_list args)
 849 {
 850         return vsnprintf_internal(buf, INT_MAX, fmt, args);
 851 }
 852
 853 int sprintf(char *buf, const char *fmt, ...)
 854 {
 855         va_list args;
 856         int i;
 857
 858         va_start(args, fmt);
 859         i = vsprintf(buf, fmt, args);
 860         va_end(args);
 861         return i;
 862 }
 863
 864 static void panic_finish(void) __attribute__ ((noreturn));
 865
 866 static void panic_finish(void)
 867 {
 868         putc('\n');
 869 #if defined(CONFIG_PANIC_HANG)
 870         hang();
 871 #else
 872         udelay(100000); /* allow messages to go out */
 873         do_reset(NULL, 0, 0, NULL);
 874 #endif
 875         while (1)
 876                 ;
 877 }
 878
 879 void panic_str(const char *str)
 880 {
 881         puts(str);
 882         panic_finish();
 883 }
 884
 885 void panic(const char *fmt, ...)
 886 {
 887         va_list args;
 888         va_start(args, fmt);
 889         vprintf(fmt, args);
 890         va_end(args);
 891         panic_finish();
 892 }
 893
 894 void __assert_fail(const char *assertion, const char *file, unsigned line,
 895                    const char *function)
 896 {
 897         /* This will not return */
 898         panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
 899               assertion);
 900 }
 901
 902 char *simple_itoa(ulong i)
 903 {
 904         /* 21 digits plus null terminator, good for 64-bit or smaller ints */
 905         static char local[22];
 906         char *p = &local[21];
 907
 908         *p-- = '\0';
 909         do {
 910                 *p-- = '0' + i % 10;
 911                 i /= 10;
 912         } while (i > 0);
 913         return p + 1;
 914 }
 915
 916 /* We don't seem to have %'d in U-Boot */
 917 void print_grouped_ull(unsigned long long int_val, int digits)
 918 {
 919         char str[21], *s;
 920         int grab = 3;
 921
 922         digits = (digits + 2) / 3;
 923         sprintf(str, "%*llu", digits * 3, int_val);
 924         for (s = str; *s; s += grab) {
 925                 if (s != str)
 926                         putc(s[-1] != ' ' ? ',' : ' ');
 927                 printf("%.*s", grab, s);
 928                 grab = 3;
 929         }
 930 }
 931
 932 bool str2off(const char *p, loff_t *num)
 933 {
 934         char *endptr;
 935
 936         *num = simple_strtoull(p, &endptr, 16);
 937         return *p != '\0' && *endptr == '\0';
 938 }
 939
 940 bool str2long(const char *p, ulong *num)
 941 {
 942         char *endptr;
 943
 944         *num = simple_strtoul(p, &endptr, 16);
 945         return *p != '\0' && *endptr == '\0';
 946 }